Showing posts with label vacuum furnace. Show all posts
Showing posts with label vacuum furnace. Show all posts

6/10/2020

Submersible mud pump


Product overview

WQ (QW) submersible mud pump is a new generation of pumps developed on the basis of the introduction of foreign advanced technology and the use characteristics of domestic pumps. It has the characteristics of high efficiency, energy saving, unique structure, anti winding, non blocking, automatic installation and automatic control. It has a unique effect in discharging solid particles and long fiber waste. It is applicable to chemical, petroleum, pharmaceutical, mining, paper industry, cement plant, steel plant, power plant, coal processing industry, as well as the sewage and dirties of conveying belt particles in the drainage system of urban sewage treatment plant, municipal engineering, construction site and other industries. It is also used for pumping clean water and corrosive medium.

WQ (QW) submersible mud pump

WQ (QW) submersible mud pump adopts a unique impeller structure and a new type of mechanical seal, which can effectively transport solids and long fibers. Compared with the traditional impeller, the impeller of the pump adopts the form of single channel or double channel, which is similar to a bend with the same cross-section size, and has very good over flow performance. With a reasonable volute chamber, the pump has high efficiency, the impeller has dynamic and static balance test, and the pump has no vibration in operation.

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Liquid ring vacuum pump
What is liquid ring vacuum pump?
Liquid ring vacuum pump manufacturer

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8/27/2019

Vacuum pump operation instructions


1. Check the oil level, to stop the pump filling oil to the oil standard center is appropriate. Too low on the exhaust valve can not play the role of oil seal, affect the vacuum degree. Too high, may cause the start of air injection. It is normal for the oil level to rise during operation. Oil mining
Add clean vacuum pump oil of specified brand through the filling hole. After refueling, screw a screw plug. Oil should be filtered to avoid sundries into the oil hole.
2. The 2XZ vacuum pump can be started at the next time through the atmosphere or at any vacuum level. If the pump port is installed with solenoid valve, it should be operated simultaneously with the pump.
3. When the ambient temperature is too high, the temperature of the oil increases, the viscosity decreases, and the saturated vapor pressure increases, leading to a decrease in the limiting vacuum, especially the total pressure measured by the thermocouple. Limit vacuum can be improved by strengthening ventilation and heat dissipation, or improving oil pump performance.
4. Check the limit vacuum of model 2XZ rotary vane vacuum pump with the compressed mercury vacuum gauge as the standard. If the gauge is fully pre-checked, the pump temperature reaches stability, the pump port is directly connected with the gauge, and the limit vacuum will be reached within 30 minutes after operation. The value measured by the total pressure meter is related to the pump oil and vacuum gauge, and the regulatory error, sometimes the error can be very large, only for reference.
5. If the relative humidity is high, or the extracted gas contains more condensible steam, open the air ballast valve after connecting the pumped container, and close the air ballast valve after running for 20 ~ 40 minutes. Before stopping the pump, open the air ballast valve for no-load movement for 30 minutes to extend the pump oil life.
6. Choice of vacuum pump oil: the viscosity of the pump oil affects the starting power and the ultimate vacuum of the pump. When the viscosity is high, the vacuum degree is favorable, and the starting power is larger. The saturated vapor pressure of the oil at pump temperature will affect the ultimate total pressure of the pump, the lower the better. The viscosity of high speed vacuum pump oil and 3# diffusion pump oil is higher than that of no. 1 vacuum pump oil, and the saturated vapor pressure is lower than that of no. 1 vacuum pump oil, but the price of 3# diffusion pump oil is higher. Specific choose what oil, according to the above introduction combined with specific requirements to choose.
(1) in general, high speed vacuum pump oil produced in Shanghai is applied where the total pressure is expected to be above 6x10-2 pa. Small pump below 4 l/s can also be replaced by no. 1 vacuum pump, direct pump above 8 l/s can be replaced by no. 3 diffusion pump.
(2) if the vacuum degree is not high, and the pollution of oil is changed frequently, and the supply of vacuum pump oil is difficult, no. 50 mechanical oil can be used instead.
(3) if the ambient temperature is low, it is difficult to start, and the limit vacuum requirement is not high, zhenzhai pump oil or mechanical oil with slightly lower viscosity can be used
Iran vacuum pump
Saudi Arabia Vacuum Pump
Libya vacuum pump supplier

Dry scroll vacuum pump 

8/22/2019

Liquid ring vacuum pump noise cause


Liquid ring vacuum pump (hereinafter referred to as liquid ring pump) is a kind of coarse vacuum pump. The maximum vacuum it can obtain is 2000-4000Pa, and the air ejector in series can reach 270-670Pa. Liquid ring pump can also be used as compressor, called Liquid ring compressor. It belongs to low-pressure compressor, and its pressure range is 1-2*105Pa gauge pressure.
Causes of Noise in Liquid ring Vacuum Pump
1. It can't start or it's noisy.
Possible causes: insufficient supply voltage of motor; motor phase-absent operation; long-term uselessness of pump leads to rust; inhalation of impurities in pump; impeller drag distribution plate.
Elimination methods: check whether the supply voltage is too low; check whether the motor wiring is reliable; if the pump is not used for a long time, it can point the rust remover or open the pump cover to remove the rust artificially; open the pump cover to remove impurities; adjust the distance between the impeller and the distribution plate.
2. Reasons for insufficient vacuum
Possible reasons: insufficient power supply of motor leads to insufficient speed; insufficient water supply; excessive gap between impeller and distributor plate; breakage of mechanical seal leads to leakage; excessive wear of impeller; inadequate drainage of circulating water.
Exclusion: Check whether the supply voltage is within the rated voltage range of the motor; Increase the water supply (must be controlled in the correct range, otherwise the motor will overload and heat); Adjust the clearance between the impeller and the distribution plate (generally 0.15-0.20 mm); Replace the mechanical seal; Replace the impeller; Check the pipeline of the outlet.
3. insufficient Liquid ring vacuum pump
Possible causes: leakage of gas and liquid in pipeline; increase of resistance loss;
Removal method: Check the mechanical seal at the connection; Check the pipeline and check valves for faults.
4. Overheating of motor of Liquid ring vacuum pump
Possible causes: excessive water supply leads to motor overload; motor phase absence; blockage of exhaust holes; impeller driving other components.
Removal methods: reduce the water supply to the normal range (refer to the amount of liquid supplied by the pump instructions); check whether the wiring is firm; check the exhaust port; open the pump cover to adjust the gap between impeller and other components.
Vietnam liquid ring vacuum pump supplier

Iran liquid ring vacuum pump supplier 

8/13/2019

The cause of vacuum pump cavitation


Cavitation corrosion is a kind of high-noise and destructive phenomenon often occurred in hydraulic machinery. In vacuum acquisition equipment, cavitation corrosion of water-ring vacuum pump is also known to all, and the damage to vacuum pump is a cumulative process, which is easy to cause impeller perforation.
The principle of its occurrence is: due to the action of liquid dynamics, when the partial pressure of the moving liquid drops to the vaporization pressure at this temperature, the liquid begins to vaporize and form bubble, bubble filled with liquid vapor and a small amount of dissolved gas in the liquid. When the bubble with the moving liquid reaches the area where the static pressure exceeds the critical pressure, the steam in the bubble will suddenly condense and burst the bubble. Because the pressure in the bubble is always lower than or close to the critical value, and the pressure of the external liquid is relatively large, so when the bubble bursts, the surrounding liquid rushes to the bubble center at a very high speed and forms the effect of high-frequency water hammer, generating high local stress and local temperature rise, and generating noise and vibration. Repeated processes of the formation and bursting of such bubbles will damage the surface of parts in this area. In addition, chemical and electrochemical corrosion of liquid and parts materials will eventually result in cavitation damage with spongy or honeycombed characteristics.
It is also shown that cavitation may occur even above the critical pressure. Because the pressure decreases, dissolved in the liquid air and other gas will be analyzed, at the same time, the liquid steam out, full of steam and gas liquid and bubble formation, the bubble in the movement parts surface easily produce and grew up, was taken away by liquid, where high pressure suddenly condensation and burst.
The critical pressure at which cavitation occurs varies with the properties of liquids, temperatures, and dissolved gases. For degassing normal temperature water, the saturated vapor pressure equivalent to that of the water temperature can be taken as the critical pressure value for the occurrence of bubble.

Water ring vacuum pump
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2bv vacuum pump

3/22/2019

Application of vacuum pump in coating industry


Vacuum coating technology is an important branch of vacuum application technology. It has been widely used in optics, electronics, energy development, physical and chemical instruments, construction machinery, packaging, civil products, surface science and scientific research and other fields. Vacuum coating mainly includes evaporation plating, sputtering plating, ion plating, beam deposition and molecular beam epitaxy. Chemical vapor deposition is also available. If the purpose of vacuum coating is to change the physical and chemical properties of the material surface, this technology is an important part of the vacuum surface treatment technology, and its classification is shown in table 6. This paper gives a brief introduction to its main applications. First in optics, an optical glass or quartz surface coated with a layer or several layers of different substances of the film, can become a high reflection or no reflection (that is, anti-reflection film) or any expected proportion of reflection or transmission materials, can also be made to one wavelength of absorption, but another wavelength of transmission of the color filter. High reflection film from large aperture telescopes and a variety of lasers, all the way to the new building's large window coating jasmine, are in great demand. Anti-reflection film is a large number of cameras and a variety of lasers began, all the way to the new building's large window coating glass, are very needed. Antireflection film is widely used in the lens of cameras and television cameras. Vacuum coating plays an important role in electronics. Inheritance circuits of all sizes. Include memory, arithmetic implement, tell logic element to want to use conductive film, dielectric film and protective film. Chromium film is used as a mask for preparing circuits. Magnetic tape, disk, semiconductor lasers, Josephson devices, charge-coupled devices (CCD) are also channels of various films. In terms of display devices, video head, high-density video tape, transparent conductive film of plane display device, optical conductive film of camera tube and aluminum lining of display tube fluorescent screen are also prepared by vacuum coating method. In terms of components, evaporation of ni-cr in vacuum, chromium or cermet can make resistance, evaporation of aluminum, silicon monoxide and titanium dioxide on plastic can make capacitors, evaporation of selenium can get toner for electrostatic copier, evaporation of barium titanate can make magnetostrictive sound components, etc. Vacuum evaporation can also be used to fabricate superconducting films and microbead coatings for inertial confinement reactions. In addition, it can also be used to steam decorative film such as jewelry, watch shell surface, textile metal pattern, gold and silver wire wire, and use sputtering or ion plating on knives, molds and other manufacturing superhard film. In the past two years the rise of multi-arc ion plating prepared titanium products, such as stainless steel sheet, mirror plate, column, handrail, high-grade bed bracket, stair railing, etc. Is currently prevalent.
dry scroll vacuum pump

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3/18/2019

Water ring vacuum pump main pump selection scheme


The importance of water ring vacuum pump scheme design in the development of water ring vacuum pump units is emphasized. The importance of process reengineering and optimization in the scheme design of water ring vacuum pump units is emphasized. This paper focuses on the steps of reengineering the design process of vacuum units. Theoretical basis of business process reengineering concept, at the same time, the implementation method carried on the deep into the research purpose is to systematically predecessors' experience and results of the implementation of process reengineering for vacuum unit guide design process reengineering theory is very important in the design process of vacuum unit but experienced technicians often can draw on experience rapid preliminary work out one or more basic applicable scheme so this topic is mainly to adopt RBR to selected unit at the core of a vacuum to obtain equipment with CBR modelled on the previous order to perfect a complete set of units and then a complete set of this design The process is included in the instance library as a case for future repair and reuse. Show the significance of this system to the actual production of enterprises.
At the same time, this paper elaborates on the deficiencies in the research of intelligent design, especially in the case based mechanism of the system. Finally, the application of intelligent design in enterprises in the future is prospected. Configuration and selection of related components of vacuum unit system: after the preliminary determination of vacuum equipment, the recommended matching motor for each single pump will be equipped; Some special vacuum pumps also need to be equipped with special supporting equipment, such as air cooling pump equipped with heat exchanger, condenser equipped with water ring pump separator, etc. According to the diameter of the inlet and outlet and the external dimension of each vacuum pump, the suitable connecting pipe is selected. Provide flanges and valves for pipes; Install vacuum meters, thermometers and other measuring devices in key positions; Equipped with electric control cabinet for the whole unit; According to the position of each component to set up the frame. Through the study on enterprise's design process of vacuum unit in detailed analysis we obtain the basic knowledge of the design process and design of logic and won several key elements such as very empirical design principles and on the basis of some have some definite formula theorem in a vacuum, there are detailed in the technical data indicate or are prescribed in the national standard, industry standard and is deep design engineer experience.
Select vacuum pump according to pumping speed

Liquid ring vacuum pump compressor 

3/14/2019

Water ring vacuum pump for vacuum transport features


Water ring vacuum pump has the characteristics of vacuum transportation: compact structure, reliable balance and uniform flow. In chemical production, it is often used to transport or pump inflammable, explosive and corrosive gases. Water ring vacuum pump because impeller mixing liquid, loss of energy, so its efficiency is very low.
Vacuum pump is widely used, can be used in petroleum, chemical industry, machinery, mining and many other industrial sectors, it can also be used for conveying vacuum, I do not know if you know its characteristics of conveying vacuum, the following is to introduce the characteristics of vacuum pump for vacuum transport:
1, high efficiency, equipment no return transport, other means of transport are free to return the defect of the wrist, and the transport medium is air, only in the terminal into the atmosphere, in the process of transport, the inlet can be continuous feeding, complete continuous transport.
2, the equipment has simple structure, manufacture, processing, equipment match bento, control costs, less set up time is short, the main form of vacuum pump system local are steel plate welding structure, composed of pipe, tank shape of components, the relative movement between components, easy maintenance operations are compared, if adding some control equipment, it is easy to complete automation.
3, recommended pipeline, easy to tailor to set up the network, layout cumbersome and sensitive, can be full of application field air product, easy to comply with the operating environment.
4, labor health condition is good, when the vacuum pump material in the tube, the tube is in negative pressure, the dust will not leak float in the sky, not the flying environment, or stained with dust in the process of walking, can also stop the sorting, boring and other intermediate disposal, such as material walks under negative pressure, due to the moisture to evaporate easily under negative pressure, so, even if do not use other boring wrist, high moisture materials in the process of walking, will also get some boring, application grain weight of different materials, and design appropriate allow for material handling material separation.
Vacuum pump recommended high efficiency, simple structure, easy to operate, and good labor hygiene, very suitable for the transmission of vacuum, for the above introduction hope to help you, today's introduction to this.

Vacuum Pump For Vacuum Drying Oven?
Roots blower for sewage treatment
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Roots blowers 

3/13/2019

The rotary vane vacuum pump operates in high temperature to deal with faults


Rotary vane vacuum pump is a device that can generate, maintain and improve vacuum in a certain space through various ways. It is mainly used in chemical, food, electronic and other industries and plays a crucial role in promoting the progress of science and technology and the development of society in China. In the high temperature environment, such harsh conditions, the vacuum pump and other mechanical equipment to the normal and efficient work has brought a severe test.
Vacuum pump high temperature reason:
1. Normal heating, compression heat and friction heat of the motor
2, the power supply voltage is not normal, the motor bus voltage is 380V, due to the cable voltage and uneven load distribution, the motor voltage is less than 380V, the power constant voltage becomes smaller, resulting in current increase, thermal power increase
3, the refrigerant leakage, condensation pressure is too high
4. Low fan speed, small blade and small air volume
5, motor attached to dust and oil, etc., heat dissipation blocked
6, motor performance quality low vacuum pump high temperature solution:
1. Lengthen the fan cover, and install an axial flow fan with the same diameter as the fan inside. The power supply of the fan is also equipped
2. Adjust and control the inlet pressure
3. Dredge and add cooling water
4, adjust the amount of oil, choose high-quality oil
5. Regular inspection, mainly including oil level inspection, temperature inspection, motor load and motor accessories inspection
6. Regular cleaning and maintenance. Keep the motor clean and clean, regularly clean dirt, increase the heat dissipation capacity of vacuum pump motor.
There are many kinds of vacuum pumps, including screw pump, water environmental protection, rotary vane pump, roots pump and vortex pump, etc. According to the types and working conditions of vacuum pump, the influence of high temperature on the normal operation of equipment is analyzed from many aspects. High temperature will not only reduce the working efficiency of the vacuum pump, but also increase the energy consumption. Only by selecting high-quality products and services, keeping an eye on the usual working state of the vacuum pump, and timely maintenance, can the continuous high quality work efficiency be achieved
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3/04/2019

Single stage rotary vane vacuum pump maintenance points?


Single-stage rotary vane vacuum pump is also called XD rotary vane vacuum pump. Today xiaobian will give you a detailed introduction to the use and maintenance of single-stage rotary vane vacuum pump, small partners can remember it!
XD rotary vane vacuum pump vacuum pump oil
XD type rotary vane vacuum pump shall generally use XD rotary vane vacuum pump oil in accordance with sh0528-92 standard. Ambient temperature at 10 ℃ to 40 ℃ ISO ~ VG100 viscosity grade of XD rotary vane vacuum pump oil. Environment temperature 0 ℃ ~ 10 ℃ when using ISO VG32 ~ viscosity grade of vacuum pump oil. Vacuum pump operation must ensure that the oil level in the oil window height of 1/2-4/5. Check oil level and oil contamination regularly (weekly is recommended). If the oil level is too low, stop the XD rotary vane vacuum pump and add the appropriate vacuum pump oil to 4/5 of the height of the oil window. If the oil will be contaminated oil black, emulsifying, thickening, should be promptly changed oil.
Ii. 2XD rotary vane vacuum pump replacement of vacuum pump oil and oil filter time
XD rotary vane vacuum pump recommended pump after the first full 150 hours of work for oil. After that, change the oil every 500 hours. Oil filter should be replaced when changing oil. If the oil by pollution blackening, emulsification, thickening should be timely oil change. And clean the pump before adding new oil.
Three, cleaning, oil change steps:
1. Stop the XD rotary vane vacuum pump to drain the hot oil.
2. Turn on the drain plug and run for 5-10 seconds.
Drain the oil.
4. Inject cleaning oil (no. 32 ordinary machine oil) to 3/4 of the height of the oil window.
5. Operate XD rotary vane vacuum pump for 5-10 minutes.
6. Stop the pump and drain the oil. If the oil does not meet the requirements, repeat steps 4 and 5.
7. Turn on the drain plug to run 5-10 banknotes.
Drain the oil.
9. Inject the specified new XD rotary vane vacuum pump oil.
Iv. Replace the exhaust filter
If the pump temperature rises obviously, the motor current reaches or exceeds the rated current, and the exhaust port of the pump produces lampblack, it shall check whether the exhaust filter is blocked. If it is blocked, it shall be replaced in time. The exhaust pressure gauge can be installed in the refueling hole of the pump to check whether the filter is blocked. Replace the exhaust filter when pressure exceeds 0.6bar(gauge pressure).
Five, clean the suction filter
The suction strainer should be kept clean to prevent rapid drawdown.
Vi. Storage method
If the pump is not used for a long time, should drain the oil and clean the pump, and then inject the specified new oil placed in a dry place.
XD type rotary vane vacuum pump others
1. If the user needs to order spare parts for maintenance, please inform the model and machine number of XD rotary vane vacuum pump. The type and number of the pump can be found on the nameplate of the pump.
2. As some maintenance and repair work requires certain professional knowledge, equipment and special tools, please contact the manufacturer for details.
3, pump handling should ensure that there is no oil. Do not impact tubing, oil filters, etc.

Laboratory Vacuum Pump Buyer's Guide
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2/28/2019

How to reduce the vacuum pump energy consumption?


When we choose a vacuum pump, we should not only consider its quality and efficiency, but also consider whether the energy consumption is high or not. Generally, we will choose the one that is more energy saving. How to reduce the energy consumption? Xiaobian teach you a few simple and feasible methods.

How to reduce the vacuum pump energy consumption?

1 reasonable selection of vacuum pump materials
Considering that the operating life of the vacuum unit can be maintained for more than 6 years, low-price and easy to be cast should be selected as far as possible. For corrosive liquid and other media, anti-corrosion of over-current parts and stainless steel materials can be selected. Of course, the specific selection should be combined with the actual needs of the industry.
2 reasonably determine the output of the vacuum pump
First of all, it is necessary to find out the resistance of all levels of vacuum pump system and eliminate the abnormal phenomenon of excessive resistance. Secondly, it considers the maximum pumping capacity under the influence of all kinds of adverse factors, and determines the safe and economical system pressure according to the operation requirements. Finally, according to the total pumping capacity of the vacuum unit to transform the output configuration, to ensure the safety of the premise, so that the system in the medium-speed operation, the operating conditions required by the vacuum degree and pumping capacity and the efficiency of the vacuum pump match.
3. Properly use the pipeline
The reliable and efficient pipeline is selected by the method of close cooperation between theoretical calculation and model experiment, and the vacuum degree of the working condition is guaranteed under the condition of possible low air extraction.
Maximize the potential of the motor
Saving energy is what we all want, after knowing how to make the vacuum pump reduce energy consumption of the knowledge, in the use of it in the future will be more satisfied.

How to choose the right vacuum pump for vacuum adsorption?

How to choose vacuum pump for vacuum packaging machine? 

2/27/2019

Vacuum pump selection problem


Vacuum pump is the key equipment in the process of vacuum drying. The selection of vacuum pump type should consider whether it is suitable for the field production process.
The power transformer drying process is actually a dehumidification process, there is a large amount of water vapor to vent, so the selection of the former pump to be able to withstand the higher partial pressure of water vapor, such as the use of rotary vane pump or water ring pump.
But the general large power transformer (voltage grade 110kV and above) in the drying vacuum tank system the limit vacuum requirements in 1OPa, water ring pump plus a roots booster pump are far from meeting the requirements (let alone consider the system leakage).
Introduced the present domestic equipment and imported by the single-stage rotary vane vacuum pump (with gas ballast valve) can be up to 50 pa limit vacuum (domestic single-stage rotary vane pump can achieve even 10 pa, but performance has certain gap with imported), coupled with the level of roots pump, vacuum degree can be improved at least under 10 pa (considering system leakage rate of pressure rise within l0h no greater than 93 pa).
Therefore, now the transformer vacuum drying equipment tend to choose rotary vane vacuum pump as the front vacuum pump.
At the same time, there is a large amount of water mixed in the pumping medium. According to the saturation vapor pressure curve of water, when the pump temperature reaches 60, the saturation vapor pressure of water can reach 19.8kpa. This partial pressure affects the ultimate vacuum of the pump.
If the use of ballast pump, it can suck water vapor, but its maximum inlet pressure (partial pressure of water vapor) and pump volume and pump temperature.
In the case of a certain degree of vacuum, the higher the temperature, the more volatile water, liquid to the pump oil in the water is very little.
Therefore, operating the vacuum pump at the highest temperature is an effective way to ensure that the vacuum pump can reduce oil emulsification and obtain a high vacuum.
What types of vacuum pumps are commonly used for vacuum chucks?
Roots blower in the mine application
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2SK double stage water ring vacuum pump

2/26/2019

Influence vacuum pump vacuum degree of seven factors


1, the vacuum pump blade wear, and the cylinder body conflict between the contact surface can not be large, resulting in a lack of vacuum.
2, cylinder body wear, cylinder wall may appear wear, resulting in a lack of vacuum.
3. Rotor displacement. The standard installation position of rotor and end cover is offset, resulting in insufficient vacuum.
4, vacuum pump leakage, vacuum pump at the beginning and end of a long time after the use of the seal gasket aging caused vacuum pump leakage, resulting in insufficient vacuum.

5. Whether the motor is normal. Motor speed is not normal pumping speed will slow down, resulting in a lack of vacuum.
6, vacuum pump oil emulsification, carbonization. Vacuum pump in the long-term use of the process is not usually replaced and artificial conditioning, vacuum pump oil will produce emulsification or carbonization phenomenon, resulting in the vacuum pump cylinder wear, tubing congestion, oil filter congestion and a series of problems.
7, vacuum pump oil filter congestion or damage. Vacuum pump oil filter is also called oil mist separator, oil filter, exhaust filter, etc., if the oil mist separator produces congestion, the gas pumped into the pump body will not be easily removed, at this time the pump internal pressure is too high, pumping speed is reduced, the vacuum degree drops.

Explosion-proof water ring vacuum pump
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11/26/2018

Rotary vane vacuum pump installation method


1. Installation of rotary vane vacuum pump
The rotary vane vacuum pump should be placed horizontally. When the pump is running, there is almost no vibration and it is generally not fixed. The damper hole on the bottom of the XD rotary vane vacuum pump has a metric screw hole to fix the pump. Do not push or pull the pump on the ground to avoid damage to the vibration damping block.
In order to ensure good cooling of the chip vacuum pump, the air inlet and outlet of the pump cooling air should be more than 30cm away from the surrounding objects. For ease of maintenance, it is recommended to leave a gap of 0.4 m in front of the inlet and exhaust ports of the rotary vane vacuum pump. A base with a drain pan can be installed for easy draining.
The pump delivered by the rotary vane vacuum pump does not have oil. After installation, slowly inject the specified vacuum pump oil (see maintenance 5.1) through the filler port to 3/4 of the height of the oil window.
2, the electrical connection of the rotary vane vacuum pump
The electrical wiring of the rotary vane vacuum pump must be carried out by a professional electrician. Appropriate motor overload protection should be used.
The single-phase 220V50HZ vacuum pump must ensure that the voltage is within the range of 220V±10%. If the voltage is lower than 220V, it must be equipped with an AC power regulator. Do not work under low pressure and high pressure for a long time to avoid damage to the motor.
After the wiring of the rotary vane vacuum pump three-phase asynchronous motor is completed, the motor rotation must be checked. The correct rotation of the motor is: the direction of rotation of the motor shaft is counterclockwise from the fan end of the motor.
When the rotary vane vacuum pump checks the direction of rotation, the suction port should be opened or completely covered with a rubber plate (thickness of 4 mm or more), and the power supply is turned on for 2 to 3 seconds. If you turn right, you will feel strong suction or rubber sheet in the suction port and hold it tightly. If it is reversed, adjust any two of the three power cables.
Note: The rotary vane vacuum pump will run out of error for a long time and will be damaged.
3. System connection of rotary vane vacuum pump
The rotary vane vacuum pump intake pipe should be cut to a size not less than the suction port size and as short as possible. The threaded joint is vacuum sealed with a Loctite 515 or Teflon belt.
If the gas to be pumped contains dust, a dust filter must be installed at the inlet end of the pump. If necessary, take over the exhaust and the exhaust pipe should be tilted downwards.
4, the start of the rotary vane vacuum pump
The rotary vane vacuum pump can be started after the oil level is determined. After the first start and after each change of wiring, it is necessary to check the rotation to the rear to start the rotary vane vacuum pump.
5, the operation of the rotary vane vacuum pump
Before normal operation, the intake pipe should be closed to allow the pump to run for more than 15 minutes under extreme pressure conditions, which effectively removes water vapor from the gas. The motor should not be started frequently (should be less than 6 times/hour). It is recommended to install a solenoid valve on the pump intake pipe during intermittent cycle operation, and close the solenoid valve in the non-working phase to operate the pump under extreme pressure conditions. The power is not much, but it can effectively protect the vacuum pump.
Note: 1. During normal operation, the surface temperature of the oil separator, pumping, pump cover, etc. will exceed 70 °C, do not touch with your hands.
2. The rotary vane vacuum pump cannot be refueled while it is running.
6. Ultimate pressure measurement of rotary vane vacuum pump
The ultimate pressure of the rotary vane vacuum pump should be measured directly at the suction port of the pump using a compression vacuum gauge. After the pump is used for the first time, after being used for a long time, after use for new oil, the inlet should be closed for at least 1 hour, and then the rotary vane vacuum pump can reach the working temperature and the pump oil can be fully degassed to measure the ultimate pressure.

Vacuum Pump Installation Precautions

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11/22/2018

What about internal leakage of vacuum pump unit?


Speaking of the internal leakage of vacuum pump units, we should pay attention to the fact that most of it will occur on a device with water-cooled jacket. Speaking of the phenomenon of internal leakage of vacuum pump unit, in fact, we did not find any doubts when we checked the leakage, but the pumping speed of its mechanical pump will be significantly lower, and the vacuum gauge value is relatively low or the mechanical pump oil is quickly emulsified.
If it is found that the iron-based parts in the vacuum chamber of the vacuum pump unit will be obviously corroded. Basically, it can be confirmed that the phenomenon of internal leakage occurred. At this time, we should pay attention to the need to clean the inner wall first, then, to pass through the cooling water, see if it has no wetting point, its wetting point is its leak point.
In fact, the leakage of vacuum pump unit is very difficult to check. The common method is to use the ionization tube sensitive to some gases under high vacuum to detect leakage. More commonly, acetone or ethanol can be injected directly into suspicious areas with medical syringes. When the injection reaches the leak point, we will find that there will be more obvious oscillation on the Ionometer pointer.
In this way, we must have patience to detect the leakage of vacuum pump units. We must wait until the ionometer's indication is stable. In this respect, we will find that in fact, it will achieve a balance between the pumping capacity and the leakage rate, and then it can achieve injection.
For the larger leakage point of vacuum pump unit, flame method can be used directly, and the principle of using airflow to make flame deviate directly. Attention should be paid to vacuum first. Next, candles or lighters should be used to search for suspicious points near the vacuum pump unit step by step.
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11/20/2018

Roots vacuum pump advantages


Roots vacuum pump is a rotary volumetric vacuum pump. Its structure is evolved from roots blower. It first appeared in Germany in 1944. It is used as a mechanical booster pump for vacuum smelting system with large pumping speed in the pressure range of 10-1000Pa.
According to the different working pressure range of Roots vacuum pump, it can be divided into low vacuum Roots pump with direct air discharge, medium vacuum Roots pump (mechanical booster pump) and high vacuum multi-stage Roots pump. The most commonly used domestic vacuum pump is the roots vacuum pump. Roots pump has the following characteristics compared with other oil sealed mechanical pumps.
There is a larger pumping speed in a wider pressure range.
The rotor has good geometrical symmetry, so the vibration is small and the operation is stable. There are clearances between the rotors and between the rotors and the housing. Without lubrication, the friction loss is small, which can greatly reduce the driving power and achieve higher speed.
There is no need to seal and lubricate the oil in the pump chamber, which can reduce the pollution of the oil vapor to the vacuum system.
Pump chamber without compression, no exhaust valve. The structure is simple and compact, and it is not sensitive to the dust and steam in the gas pumped.
The compression is relatively low, and the effect of hydrogen extraction is poor.
The surface of the rotor is a complex curved cylinder, which is difficult to process and inspect.
Roots pump has been developing rapidly at home and abroad in recent years. It has been widely used in smelting, petrochemical, electrician, electronics and other industries.
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How to use screw pump?


1. Screw pumps are strictly prohibited to operate empty in the absence of liquid in the pump chamber. It is necessary to inject liquid into the pump body by the inlet of the pump before starting, and then start the screw pump, so as to avoid idling and wearing the stator of the screw pump. How to use screw pump?
2, before starting the screw pump, we must first determine the operation direction of the screw pump, and the screw pump can not reverse.
3. When the screw pump is newly installed or shut down for several days, it can not start immediately. It should also inject a proper amount of lubricant or liquid conveyed by the screw pump into the pump body, and then use pipe pliers to pull the screw pump several turns before starting.
4. When stainless steel screw pump transports high-viscosity liquid or corrosive medium, it should flush the cavity of screw pump with clean water or solvent to prevent blockage so as to avoid damaging the stator when starting screw pump next time.
5. When using single screw pump in winter, the volume fluid of the pump should be excluded when the temperature is too low to be used, so as to prevent the freezing crack of the pump body or the stator from being pulled out when the pump freezes next time it starts. How to use screw pump?
6. Lubricating oil should be added regularly in the bearing box during use. When seepage is found at the shaft end, oil seals should be treated or replaced in time.
7, in the event of abnormal operation, should immediately stop the reasons for pump inspection, troubleshooting.
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Rotary vane vacuum pump in sugar manufacture application



There are three main applications of rotary vane vacuum pump in sugar industry, including preparation of compressor, filtrate of dirt and application in evaporator and vacuum sucker.
Rotary vane vacuum pump in compressor application
Compressor not only compressed, but also keep the gas clean. The compressor is completely oil-free and insensitive to solid particles. The disc of the compressor can ensure that the gap between the rotor and the impeller is large enough to prevent the disc from wearing due to the inhalation of lime/soot during gas cleaning. These impurities will not be discharged with the gas, thus ensuring the cleanliness of the collected gas.
Application of rotary vane vacuum pump in evaporator and vacuum sucker
Within the whole suction pressure range, the vacuum pump/compressor can maintain a high suction capacity, which can shorten the vacuum disc start-up time, and is easy to adapt to changes in operating conditions such as starting/stopping pumps. Because pumping wet air, water vapor will condense in the pump, so the pump pumping capacity is quite large, but the power consumption is not increased.
Application of rotary vane vacuum pump in dirt filtration
Rotary vane pump / compressor can withstand accidental water impact. The size of the exhaust port on the distribution plate is specially designed and has pressure release holes (anti-over-compression), so that the pump can withstand water shock from the filter separator or condenser without affecting the vacuum.

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Roots vacuum pump



Product characteristics:
Clean vacuum; there is no lubricant in the chamber, and it has stable exhaust performance for vapor, solvent and other gases; it can operate under high suction pressure.
Roots vacuum pump (referred to as roots pump) is a rotary variable volume vacuum pump. It evolved from roots blower. According to the different working range of Roots vacuum pump, it can be divided into low vacuum Roots pump with direct air discharge, medium vacuum Roots pump (also known as mechanical booster pump) and high vacuum multi-stage Roots pump. Generally speaking, roots pump has the following characteristics:
There is a larger pumping speed in a wider pressure range.
Quick start and immediate work.
It is not sensitive to the dust and steam contained in the gas.
The rotor need not be lubricated, and there is no oil in the pump cavity.
Vibration is small, rotor dynamic balance condition is better, no exhaust valve;
The driving power is small, and the mechanical friction loss is small.
Compact structure and small footprint.
Operation and maintenance costs are low.
Therefore, Roots pump is widely used in metallurgical, petrochemical, paper, food and electronic industries.
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11/08/2018

molecular pump energy saving lamp application


This paper mainly introduces the application of molecular pump in the manufacture of energy-saving lamp round car instead of Roots pump. The experiment shows that the effect of energy reduction and efficiency increase is remarkable, and it has great significance for popularization. With this, the application of molecular pump in lighting industry can be promoted, production efficiency can be improved, energy consumption and manufacturing cost can be reduced, and product quality can be guaranteed.
Nowadays, the rapid development of economy brings about huge consumption of energy and threatens the living environment of human beings. It is an urgent worldwide task to improve efficiency, reduce consumption, save energy and reduce emissions to protect the environment. In the application of wide molecular pump, diffusion pump or Roots pump are replaced in many occasions, and good energy-saving and consumption-reducing effects are achieved.
As we all know, the promotion and use of energy-saving lamps in the lighting industry is a measure to save energy and reduce consumption. If all the current ordinary incandescent lamps are replaced by energy-saving lamps, more than 60 billion kilowatt-hours of electricity can be saved throughout the year, which is equivalent to the annual power generation of a Three Gorges hydropower station. However, energy-saving lamps have been introduced to the market for a long time, but their popularity has failed to achieve the desired results. The reason is simple: the energy consumption cost in the manufacturing process of energy-saving lamps is higher, so their relative sales price is also expensive.
According to the relevant information, the high price of energy-saving lamps leads to the difficulty of household consumption, which affects the market promotion. For enterprises manufacturing energy-saving lamps, their previous research and development investment is too large, as well as the production cost is too high. Even if energy-saving lamps save 60% energy than traditional bulbs, their life is 8 times longer than the latter, but their price is 4-5 times the price of ordinary bulbs. In this way, although the energy-saving lamp can save energy and money, but in a certain period of time, considering the immediate interests, the one-time investment is indeed a little larger, moreover, there are doubts in product quality assurance and service life.
Promoting the use of energy-saving lamps is a long-term and arduous energy strategy for the country. Compared with the promotion of energy-saving lamps such as discount, the government should play an active role in this regard, which is not only the top priority, but also can do something. At the same time, the state should formulate corresponding policies and supporting laws and regulations, set up special financial subsidies for energy-saving products, tax relief and other preferential measures, encourage more enterprises to invest in the production and development of energy-saving products, innovate processes, help enterprises reduce production costs, so that energy-saving products have more price advantages in the market competition. In addition, the whole society should support the development of energy-saving and environmental protection research activities in order to achieve energy-saving and environmental protection in the whole society.
At present, in the enterprises that manufacture energy-saving lamps, most of them adopt automatic line of circular row machine, which has high production efficiency and good product quality consistency. However, in general, round row machines are equipped with direct-connected vacuum pumps and Roots vacuum pumps as units, which brings new problems: 1) high power consumption; 2) high noise; 3) large occupied area. For this reason, all lighting equipment enterprises and lighting production enterprises are actively looking for new technology and new methods to carry out technological transformation in order to improve these conditions. Replace the roots pump unit with molecular pump unit.
At present, in the promotion and application of energy-saving lamps, the government gives strong support and corresponding subsidies and policy support. Relevant enterprises are also actively looking for ways and means to save energy and reduce consumption. In the production process of energy-saving lamp, we should tap the potential of reducing consumption and adopt new technology and new means to realize energy-saving in production. This is a successful attempt to save energy and reduce emissions in the production of energy-saving lamps in the lighting industry.

1. Molecular pump experiments introduction

The composite molecular pump adopts the integral rotor processing technology, which greatly improves the overall strength of the rotor, and greatly reduces the gas reflux between different levels of the movable sheet, so as to obtain better vacuum performance faster. The ingenious cavity design in the center of the rotor greatly reduces the probability of damage caused by foreign body falling into the pump. The molecular pump can work in the harsh environment such as large air flow impact or foreign body (broken glass) falling into. At the same time, it has the advantages of low noise, low energy consumption, small occupation, low maintenance cost, high vacuum, high pumping speed, no oil pollution and so on. Preliminary tests show satisfactory results and prove that the design meets the requirements. Finally, the compound molecular pump is used for the replacement test of the energy-saving lamp circulated machine to get the recognition of lighting.

2, Molecular pump comparative analysis

(1) the pumping rate of the molecular pump unit is higher than that of the roots roots pump unit, and the vacuum degree is one order of magnitude higher.
(2) less noise and less floor space.
(3) operation cost: 280 days a year, 24 h per day and 6720 h a year. Unit: The unit power consumption of Yuan Molecular Pump Unit is 2.38 kW *6720 H = annual power consumption of 15993.60 degrees *1 yuan/degree = 15993.60 yuan Roots Pump Unit power consumption of 8.8 kW *6720 H = annual power consumption of 59136 degrees *1 yuan/degree = 59136 yuan.
Through the above calculation, the investment cost can be recovered from the electricity charge in recent years (59136-15993.60 = 43142.40 yuan). The use of molecular pump units in second years saved 43142.40 yuan in profitability. If the cost of maintenance is considered more substantial, the molecular pump is almost maintenance free. The successful substitution of the molecular pump contributes tremendously to energy saving and emission reduction, achieves a win-win situation in manufacturing applications and expands the new application fields of the molecular pump, which is worthy of promotion.
The energy-saving lamp manufactured by the circular platoon car replaced by molecular pump is tested. The lamp life and quality are improved obviously. The oil pollution of the system is reduced by mass spectrometry analysis. Spectrum analysis shows that the lamp performance manufactured by molecular pump exhaust is greatly improved.
At the same time, according to the practical application feedback of many other special lamps (metal halide lamp, beacon lamp, etc.), car lamp, semiconductor lighting and other customers, molecular pump has played an obvious role in reducing production energy consumption, improving product performance and service life, and has been applied in some well-known lighting manufacturers at home and abroad. Molecular pumps have been well received and heavily replaced.
3. Conclusion
(1) Molecular pump units are directly used in circular row machines to adapt to the unavoidable high pressure caused by air leakage and breakage, the impact of atmospheric flow and glass debris in the manufacturing process, to achieve the goal of reducing consumption, saving energy and guaranteeing quality, so it can completely replace Roots pump units.
(2) Lighting industry has unlimited prospects, product manufacturing technology and product types are developing rapidly, and there is much room for innovation at the level of equipment manufacturing. Together, it contributes to improving the production efficiency of the industry, reducing energy consumption and manufacturing costs, and ensuring and improving product quality.
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Website source:www.evpvacuum.com
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Main factors affecting the power of slide valve vacuum pump


The key to affect the power of the sliding valve pump is the exhaust pressure of the pump, and the size of the exhaust pressure of the sliding valve pump depends on the design of the exhaust system.
The first is the structural design of the exhaust valve. The exhaust system of single stage slide valve pump can be made of composite structure of floating valve and spring valve. When the inlet pressure of the slide valve pump is very high, because of the large flow of gas, it can discharge large flow of gas through the combined action of floating valve and spring valve; when the inlet pressure is low, only a small amount of gas can be discharged through the action of floating valve. For a two-stage spool pump, when working near the limit pressure, the exhaust system of the two-stage spool pump can not adopt the structure of the floating valve because the flow rate of the gas extracted by the pump is too small to operate accurately by the floating valve.
The second is the reset device of the exhaust valve. Floating valve is operated by differential pressure without reset device. The spring valve is reset by spring force. On the premise that the exhaust valve can close in time at the end of exhaust, the spring elasticity coefficient of the exhaust valve should be smaller. Under the same exhaust pressure, the exhaust valve has a larger stroke, and the exhaust valve has better conductivity, which is conducive to reducing the exhaust pressure of the pump and reducing the slide valve. Pump power.
The third is the design of exhaust passage. From the point of view of reducing the power of the slide valve pump, when designing the exhaust passage, it is necessary to ensure that the compressed part of the pump is always connected with the exhaust passage during the exhaust process, so as to avoid ineffective compression and lubricant compression, which is conducive to reducing the power of the pump; secondly, the exhaust passage must have sufficient conductivity to ensure the rapid discharge of gas. It is helpful to reduce the exhaust pressure of the pump.
The viscosity of lubricating oil has great influence on pump power. The viscosity of the lubricating oil makes the moving parts of the pump suffer additional resistance in the course of operation. The higher the viscosity of the oil, the greater the resistance and the greater the power consumption. With the increase of temperature, the viscosity of lubricating oil decreases, the resistance caused by lubricating oil decreases, and the power consumption decreases. For example, when the inlet pressure of the H-150 slide valve pump is 3.3 *104 Pa, the power is 12.2 kW and 11.2 kW when the temperature of the pump is 50 centigrade and the temperature of the pump is 75 centigrade. The effect of lubricant viscosity on starting power of sliding valve pump is more obvious. For example, starting power of 412H sliding valve pump (normal operation with 7.5 kW motor) is 32 kW at 8 C and 34.5 kW at 4 C. This phenomenon can lead to difficulty in starting sliding valve pump in winter.
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