11/29/2018

Rotary Vacuum Pump in Vacuum Coating Industry Application


Since the emergence of vacuum coating industry in the 1930s, it has been applied in industrial production, and has been widely used in simple industries such as electronics, aerospace, decoration, packaging and so on since the 1980s.
The principle of vacuum coating refers to the deposition of a metal or a metal compound on the surface of a specified material in a vacuum environment to form a coating, so it is called vacuum coating for short.
Vacuum coating can be subdivided into evaporation coating, sputtering coating and ion coating according to its different production processes. The materials used also evolve from simple metals into many kinds of high purity oxides, high purity metals, mixtures and other compounds. So the raw materials for coating are also varied, the most common are plastics, paper, ceramics, wood and so on, which are widely used in automobiles, household appliances, daily necessities, process decoration and so on. Many materials have rough and unsightly exterior. After coating, the wear resistance, aesthetics and application range of the surface can be greatly increased. With the rapid development of technology, vacuum coating technology will be more and more used in our daily life.
So what role does the rotary vane vacuum pump play in vacuum coating?
Rotary vane vacuum pump is an essential part of vacuum coating. So, what is the use of Kaide rotary vane vacuum pump in the production of vacuum coating? The most important role of rotary vane vacuum pump is of course vacuum pumping, because vacuum coating is necessary to complete the process in a vacuum environment, so it is essential to vacuum pump. When the coating is evaporated into molecules or atoms, it is the most primitive linear motion in vacuum environment. When the coating material encounters the specified material, it will deposit on the specified material and form the coating layer. When the vacuum pumping is not clean and there are still air molecules left, the air molecules will oxidize when they encounter the coating atoms, resulting in the generation of impurities in the coating materials, and sometimes the deposition of the coating materials will be organized, so the coating can not be made. It can be seen that the rotary vane vacuum pump is indispensable in the coating process, but also is the guarantee of perfect quality, so that the production of coating products will be perfect.
At present, rotary vane vacuum pump plays a leading role in vacuum coating industry. Dongguan Punok Vacuum Technology Co., Ltd. is a vacuum expert beside you.

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11/28/2018

vacuum pumps various types of characteristics


Vacuum pump is a very practical and very important pump nowadays. Because of its different use conditions and application scope, of course, there are more than one kind of it. Vacuum pumps generally have liquid ring pumps, sliding valve pumps, direct rotary vane pumps, Roots pumps and so on, so what are their characteristics?
Most of the liquid ring pumps are castings with low processing requirements. They are labor-intensive products. Therefore, domestic liquid ring pumps have competitive advantages in price. The key is to improve design, reduce volume, reduce weight, improve efficiency and reduce energy consumption.
The sliding valve pump is durable and reliable. Various vacuum furnaces, coating machines, drying and impregnation equipments at home and abroad use the sliding valve pump as the front pump. However, the casting of the sliding valve pump is heavy and the processing workload is heavy. In order to make domestic spool pump enter the international market, it is necessary to further reduce the vibration and noise of the pump, eliminate oil injection and leakage, and improve the reliability of long-term operation of spool pump.
There are many direct-coupled rotary vane pumps, which have a large workload in processing and assembling and a low price. Domestic small and medium-sized direct-coupled rotary vane pumps have passed the technical barrier and their prices are much cheaper than those of foreign pumps. Therefore, domestic pumps still have competitive advantages. The key is to solve the problems of oil leakage from shaft seals, the performance quality of rotary vane materials and vacuum pumps, and to ensure the stable performance and reliable operation of direct-coupled pumps at high speed and high temperature. At the same time, domestic pumps still have competitive advantages. Further improve the capacity of domestic direct rotary vane pump to extract water vapor.
Roots pump is equipped with a gas cooler under the exhaust port. Some of the cooled gas is returned to the pump chamber through the pipeline to cool the rotor, so that the heat of compression is balanced, so the pump can discharge the air directly. It is very popular in the fields of petroleum, chemical industry, plastics, pesticides, dynamic balance of steam turbine rotor and aerospace.

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11/26/2018

Vacuum pump for the chemical industry


The solution to the problem of cavitation in the vacuum pump under high vacuum condition is to improve the environment of the water ring vacuum and the external conditions such as the temperature of the circulating water and the temperature of the suction gas, so that the water ring vacuum pump can reduce the cavitation. The phenomenon occurs.
In view of the manufacturing precision of the water ring vacuum pump, this problem is mainly the understanding and improvement of the design capability and production processing precision of the water ring vacuum pump manufacturer, which is also the test of the production capacity of the water ring vacuum pump manufacturer. .
In the single-stage water ring vacuum pump can not meet the production requirements, and the unit cost is too high, the traditional 2SK water ring vacuum pump has many disadvantages. For various reasons, the DZKB multi-stage water ring vacuum pump is designed, and the efficiency is higher than that in the high vacuum state. The grade pump is more than 20% higher than the 2SK water ring vacuum pump and is suitable for various chemical industries.
In order to improve the pumping capacity of the water ring vacuum pump under high vacuum, reduce the noise caused by the gas work erosion, and also to reduce the damage of the internal components of the vacuum pump by cavitation, a new high-efficiency atmospheric injector is specially designed, which is more efficient than the traditional atmospheric injector. 30%, combined with the water ring vacuum pump, can ensure that the water ring vacuum pump can pump more than 75% of the standard gas volume in the high-true state.
In the long-term cooperation with customers, Haokede Vacuum Pump Mall has also invested a lot of manpower, material resources and energy to help customers solve "difficult diseases". In particular, environmental issues have further linked water ring vacuum pumps to environmentally friendly equipment. Therefore, a vacuum environmental protection waste liquid treatment system is designed, and 100% adopt physical and environmental protection treatment methods to prevent secondary pollution.

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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.

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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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11/21/2018

Installation of Water Ring Vacuum Pump


The operation premise of vacuum pump is correct installation. If the installation is not correct, there will be many faults leading to the failure of operation, then how should each part of the water ring vacuum pump be installed?
Key Points for Correct Installation of Water Ring Vacuum Pump
Installation of pump body and mechanical seal
When the static ring part of mechanical seal is installed on the pump body and the static ring part of mechanical seal is installed, it can be wetted with water and evenly pressed into the pump body by hand. Attention should not be too hard! After assembly, check whether the static ring part of the mechanical seal is closely assembled with the pump body.
Tighten the pump body on the motor and tighten the bolts. Be careful not to damage the static ring part of the mechanical seal.
The washer is installed in the back cover of the motor, and then the pump body, the front cover of the motor, the bearing, the motor rotor and the inner bearing cover are installed in the motor housing, and the bolts are locked.
The motor fan, retaining ring, motor shield and screw are installed in turn. After installation, the motor fan cover end of the pump will be vertical to the ground, ready to install other parts of the pump.
II. Installation of Pump Shaft and Bearing
1. Pump shaft and bearing are loaded into bracket from non-driving end of bracket. Pump shaft can be installed into bracket by tapping bearing outer ring. Note: Pads or sleeve tools should be placed on the end face of the bearing to prevent damage to the bearing.
2. Install non-driving end bearing cover and lock bolts. Install the locking gasket of the roller bearing and the locking nut on the axle, then bend the locking ear of the locking gasket into the groove of the nut to prevent the nut from loosening.
3. Install washers, drive end bearing caps and lock bolts. When the pump shaft is rotated by hand, the rotation of the pump shaft should be smooth. If the pump shaft is rotated and tightened, the bolts should be loosened slightly to adjust the pump shaft to a more smooth state. 4. Install flat key, pump shaft part of coupling, press plate of coupling and locking bolt.
Three. Install impeller.
1. When the impeller is pressed on the bearing, the clearance between the impeller and the front end of the pump body should be 0.05-0.15 mm. Place the vacuum pump horizontally and check the clearance. If the clearance is too small, it may cause mechanical failure of the vacuum pump; if the clearance is too large, it will cause the decrease of the pumping rate of the vacuum pump.
2. After the clearance between the impeller and the front end of the pump body is adjusted, the depth difference between the outer edge of the pump and the impeller plane is measured by depth percentile, and the clearance reservation is determined.
IV. Installation of pump cover and disc as a whole
1. Put the motor's foot in the sky and the axis on the ground in a horizontal direction.
2. Pump cover and disc form a whole. Push the pump cover onto the pump body. Pay attention to aligning the positioning pin with the positioning pin hole of the pump body and disk. Tighten the pump cover to the pump body with bolts.
3. After the pump is installed, turn the motor fan by hand, and the pump must rotate smoothly. If the pump is not rotating smoothly or there is friction sound in the process of pump rotation, the pump cover should be removed to check the clearance of the impeller, and so on, to readjust.
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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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11/19/2018

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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11/18/2018

Anticorrosion method of vacuum pump


Vacuum pump refers to the device or equipment that obtains vacuum by mechanical, physical, chemical or physical chemical methods. Generally speaking, vacuum pump is a device that can improve, produce and maintain vacuum in a closed space by various methods. Check vacuum damage door closed, no leakage.
Check the condensate steam side discharge door closed, no leakage. The water level gauge for checking the vacuum system does not break or leak. Check low pressure cylinder exhaust steam safety door intact, no suction. Check whether there is air leakage in the connection between the vacuum extraction pipeline and the cylinder, where the air leakage decreases when the load decreases, and the vacuum rises slightly after the load increases. Check whether the water level of the low pressure heater is normal under the negative pressure and whether the drain gate is tight. Check whether the gravity return water of the speed regulating feed pump leads to the condenser. If the return water is small and the water seal bag cannot seal, the gravity return water of the sealed water of the feed pump should be poured into the ditch. Check whether the water seal, pipe, flange or weld of the vacuum system valve is not tightly spaced in the clothing school, especially the expansion box or boiler starting separator to condenser pipe and valve.
1. Corrosion protection methods for water ring vacuum pumps:
Surface treatment: remove the surface oxide thoroughly and clean the surface with acetone.
Smearing material: First, thin coat a layer of material, to ensure that the bonding and full coverage, and then evenly apply the material to the repair surface, to meet the required repair thickness can be.
Blending materials: mix in strict proportions and mix evenly until there is no chromatic aberration.
Installation and precautions: Installation should be carried out according to assembly requirements. Repair and protection materials should avoid being knocked or impacted by external forces. If materials affect assembly, they can be treated by grinding method. Never knock, so as to avoid damage to other materials.
Two, vacuum pump boring machine process route
The key point of processing technology of vacuum pump body is to ensure the correct position of assembly datum face and water chamber runner. Boring machine is the core measure in processing of pump body.
The boring process of vacuum pump is as follows:
1. The bottom foot pad is used to align the runner and clamp it. The flanges at the entrance and exit of the vehicle are respectively clamped to ensure that the flanges are parallel and coincide with the center of the runner.
2. The intake flange is placed on the worktable to find the positive flow channel and then compressed, and the holes at the assembly end of the impeller are aligned. Then the worktable rotates 180 degrees and locks the bottom and foot of the car to ensure the position accuracy of the assembly hole and the flow channel.
3. Finish other processes according to the drawing.
According to market information, most quality problems are related to poor manufacturing, so the importance of technology can not be ignored. The processing technology of vacuum pump in the production process, regardless of the structure, should be the focus of attention.
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11/15/2018

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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11/14/2018

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.
mailbox:contact@evpvacuum.com
Website source:www.evpvacuum.com
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11/06/2018

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.
Mailbox:contact@evpvacuum.com
Website source:www.evpvacuum.com
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11/05/2018

Rotary vane vacuum pump


I. summary of 2X rotary vane vacuum pump.
Type 2X rotary vane vacuum pump is a two-stage structure. Its working performance consists of two parts: high-pressure stage and low-pressure stage. Its suction port is connected with vacuum vessel or vacuum equipment. During operation, the gas in the vessel will be sucked and discharged in large quantities. When the equipment obtains vacuum, the high-pressure exhaust valve sheet will be closed, and the gas inhaled by the high-pressure stage will be transferred to the second stage, and then inhaled and discharged by the second stage, so that the vacuum equipment can obtain a certain vacuum. The technical parameter of the pump is 6 * 10-2Pa. According to the user's usage, it can be equipped with vacuum booster pump (such as Roots vacuum pump). The 2X rotary vane vacuum pump can be used as the front pump. Because the booster pump's pumping force is strengthened, the front pump can be continuously pumped out, which can make your equipment obtain higher vacuum.
Two. Application and application scope of 2X rotary vane vacuum pump.
With the rapid development of modern science and technology, the application of 2X rotary vane vacuum pump has been widely applied in various fields of science and various enterprises and institutions.
1. It can be used for scientific research, production and teaching in metallurgical, chemical, light industry, petroleum, medical, pharmaceutical, printing and dyeing, electrical appliances, vacuum, semiconductor, food, atomic energy, textile and other scientific research institutions, colleges and universities, industrial and mining enterprises.
2. Because 2X type rotary vane vacuum pump is made of ferrous metal and is relatively precise, the whole work of the pump is connected with oil, so it is not suitable for pumping out all kinds of gases which contain too much oxygen, toxic, explosive erosion of ferrous metal and have chemical effect on vacuum oil, nor can it be used as a compressor. And delivery pump for use. If a pump is equipped with a pneumatic device, a certain amount of condensable steam can be removed.
3 and 2X rotary vane vacuum pumps can be used to obtain vacuum directly below 10-3 torres, and to obtain vacuum above 10-3 Torres with other vacuum equipment.
4 and 2X rotary vane vacuum pumps are generally used at room temperature of less than 5 C and relative temperature of less than 90%.
According to the user's usage, it can be equipped with vacuum booster pump, which can be used as the front pump to form Roots rotary vane vacuum unit. Because the booster pump's pumping force is strengthened, the front pump is continuously pumped out, which can make your equipment obtain higher vacuum.
Mailbox: contact@evpvacuum.com
Website source: www.evpvacuum.com
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