What are the common control methods of centrifugal pump flow?

At present, there are four flow control methods of centrifugal pump widely used in the market: outlet valve opening adjustment, bypass valve adjustment, impeller diameter adjustment and speed control.
Common flow control methods of centrifugal pumps and their influence on energy consumption
1. Outlet valve opening adjustment
The opening of the outlet valve is adjusted, and the pump is connected in series with the outlet pipeline regulating valve. Its actual effect is like using a new pump system. The maximum output head of the pump does not change, but the flow curve attenuates. Adjust the opening of the outlet valve, and the energy consumption is 94%. When the flow is low, the power consumption is large.
2. Bypass valve regulation
In this method, the valve and pump are connected in parallel. Its actual effect is like using a new pump system. When the maximum output head of the pump changes, the characteristics of the flow curve also change, and the flow curve is closer to linearity. For bypass valve regulation, the bypass valve reduces the pump head to 55m, which can only be achieved by increasing the pump flow. As a result, energy consumption increased by 10%.
3. Adjust impeller diameter
This method does not use any external components, and the flow characteristic curve changes with the diameter. After adjusting the impeller diameter and reducing the impeller diameter, the output flow and pressure of the pump are reduced, and the energy consumption is reduced to 67%.
4. Speed control
The change of impeller speed directly changes the flow curve of the pump, and the characteristics of the curve remain unchanged. When the speed decreases, the curve becomes flat and the head and maximum flow rate decrease. Through speed control, the speed is reduced, the flow and head of the pump are reduced, and the energy consumption is reduced to 65%.
1) Total efficiency of pump system
Both outlet valve regulation and bypass regulation methods will increase the pressure loss of the pipeline and greatly reduce the efficiency of the pump system. The adjustment of impeller diameter has little effect on the efficiency of the whole pump system. As long as the speed is not less than 50% of the normal speed, the speed regulation control mode basically does not affect the system efficiency.
2) Energy consumption level
Assuming that the output flow of the pump is adjusted from 60m3 / h to 50m3 / h through the above four methods, the power consumption when the output is 60m3 / h is 100% (at this time, the pressure head is 70m)

rotary vane vacuum pump oil of key performance

What are the precautions before installation of mixed flow pump?

 

The mixed flow pump will be installed after you buy it, but how to install it to ensure its normal use is also a very important thing. In fact, it is also a technical activity in the installation process. So there will be a lot of things to do before. Next, let's talk about the precautions.
When you take back the mixed flow pump from the manufacturer, you should find a technician to install it. Before installation, all equipment shall be checked box by box according to the packing list, and then the appearance and quality of the equipment shall be checked when unpacking. When doing this, if you find any problems, contact the manufacturer in time to solve them for everyone. Under normal circumstances, there is not much problem. If so, it's also a small problem. If there are any defects, please contact the manufacturer and ask them to repair or repair them as soon as possible. Of course, you can also change a new one directly. Then we have to prepare all the tools and equipment. There are many tools and equipment you need to be special. These experts should know.
In addition, when installing the mixed flow pump, the master should be familiar with the structure and technology of the host, and these basic knowledge needs to be understood. You should also be familiar with safety precautions. Also, pay attention to the determination of the unit centerline and elevation. At this time, the building provided by the civil contractor can be used to determine its center. The elevation of the impeller center of the main engine shall be consistent with the elevation of the design drawing. Also check whether the embedded iron parts and reserved anchor bolt holes of the civil contractor meet their requirements. These are important things. I hope you will pay attention to them.
The above contents are some matters needing attention before installing the mixed flow pump. If you are engaged in this job, you can have a good understanding. If you want to know about other aspects, you can go to the website for consultation, and the technicians will answer for you. If you need to order, you can also contact us directly. After all, this is a company specializing in the production of mixed flow pumps, which ensures that you can buy products with high cost performance. I hope these contents can help more people.

What is the difference between LG and LGB?  Is there a difference in vacuum?

What are the filling methods of single-stage centrifugal pump

There are two main water filling methods before the start-up of single-stage centrifugal pump: one is to fill water by assembling the bottom valve, which is a one-way valve installed at the inlet of the inlet pipe. The disadvantage of this method is that the head loss of the bottom valve is large, which affects the device efficiency of single-stage centrifugal pump; The other is water filling without bottom valve. The advantage of this method is energy saving. Compared with the pump station with bottom valve, it can save energy by 10% ~ 15%.
Manual water filling method: for small pump stations with inlet pipe diameter less than 300mm, a bottom valve is usually set at the inlet of the inlet pipe. Generally, manual water filling method is adopted, that is, water is filled by a water filling funnel (or an inverted ordinary bottle with bottle bottom removed) from the special water filling exhaust hole on the upper part of the pump shell. For small pump stations with inlet pipe diameter less than 300mm, a bottom valve is usually set at the inlet of the inlet pipe, and the pump can also be filled with water from the outlet pipe orifice of the pump (pump station with short outlet pipeline). Because there is no need to buy other water filling equipment, this water filling method is more common in small rural pumping stations
Self diversion and water filling method: for the pump house with semi submerged type (i.e. the pump station with the elevation of the inlet pipe and the pump top below the water surface of the inlet pool), the water can be introduced into the pump by itself without manual irrigation and water diversion. The disadvantage of this pump station is that it does not make full use of the water absorption capacity of the pump, and the installation elevation of the pump is reduced, which not only increases the excavation of the foundation, but also inconvenient operation and management; But the advantages are also obvious, that is, it is easy to realize the automation of the pump station and has strong timeliness
Vacuum water tank filling method: for small pump stations without bottom valve, vacuum water tank filling method can be adopted. The vacuum water tank is a closed water tank welded with iron sheet, and its volume is three times that of the inlet pipe. The installation position of the water tank should be as close to the water pump as possible, and the bottom height of the water tank should also be slightly lower than the axis of the water pump. The height of the vacuum water tank is generally twice the diameter of the water tank.

Which series of liquid ring vacuum pump can not do double mechanical seal ?

Reasons for lower head of sewage pump

Classification of sewage pumps: submersible sewage pump, pipeline sewage pump, self-priming sewage pump, submerged sewage pump and slurry pump
(1) Impeller passage blocked
If part of the flow passage of the impeller is blocked, it will affect the work of the impeller and lead to the decrease of outlet pressure. Therefore, the pump needs to be removed for inspection and removal of foreign matters. In order to prevent this problem from happening again, if necessary, a filtering device can be added in front of the pump inlet.
(2) Internal leakage
When the clearance between the rotating part and the stationary part in the pump exceeds the design range, it will lead to internal leakage, which is reflected in the decrease of the discharge pressure of the pump, such as the clearance between the impeller port ring and the interstage clearance of multi-stage pump. At this time, corresponding disassembly and inspection shall be carried out, and the parts causing excessive clearance shall be repaired or replaced.
(3) Cavitation at inlet
If the suction pressure of the pump is too low, which is lower than the saturated steam pressure of the pumped medium, cavitation will be formed. At this time, check whether the inlet pipeline system is blocked or whether the opening of the inlet valve is too small, or increase the liquid level of the suction pool.
(4) Speed reduction
The important factors affecting the pump head are the outer diameter of the impeller and the speed of the pump. When other conditions remain unchanged, the pump head is in positive proportion to the quadratic power of the speed. It can be seen that the speed has a great impact on the head. Sometimes if the speed of the pump is reduced due to some external reason, the pump head will be reduced accordingly. At this time, check the speed of the pump. If the speed is not enough, check the cause and solve it reasonably.
(5) The operating point deviates to large flow and low head
Generally, centrifugal pumps have a continuous downward performance curve, and the flow increases gradually with the decrease of head. In the process of operation, due to some reason, the back pressure of the pump decreases, and the working point of the pump passively shifts to the point of low head and large flow with the curve of the device, which will reduce the head. In fact, this is caused by external factors such as the change of the device, which has no special relationship with the pump itself. At this time, the problem can be solved by increasing the pump back pressure, such as closing the outlet valve a little.

How to change the intake and exhaust ports of EVP-PB series scroll pumps? 

Common faults of self-priming pump

① No response after power on. Most of them are caused by short circuit of power plug, power outgoing line and motor winding.
② , difficult to start or unable to start, accompanied by "buzzing" sound. During maintenance, small bamboo can be used to quickly move the fan blade according to the running direction. If the motor runs quickly, it indicates that the starting capacitor or starting winding is damaged. Replace the capacitor with the same capacity or repair the starting winding; If the motor is stuck, it is mostly the mechanical failure of the motor and pump head, such as bearing damage, impeller jamming, etc.
③ The motor can run, but the speed is slow, and the casing is overheated and has a burning smell. Most of them are caused by short circuit of motor winding. The motor shall be disassembled and repaired by welding, jumper, isolation, rewinding and other measures according to the damage.
④ Large noise and vibration during operation. In most cases, the bearing is damaged or the fit between the bearing and the casing is improper. The motor needs to be disassembled for inspection. If the bearing is damaged, it should be replaced; If the bearing runs out of the outer circle, the matching surface of the pump shell can be chiseled; If the bearing runs inside the circle, the worn parts of the motor shaft can be chiseled. If the wear is serious, the method of surfacing first and then turning shall be adopted for repair.
Our self-priming pump products include: ZW Self-priming sewage pump, ZX self-priming (clean water, chemical) pump, zcq stainless steel self-priming magnetic pump, zcq-f fluoroplastic self-priming magnetic pump, ZBF self-priming plastic magnetic pump, fzb fluoroplastic self-priming centrifugal pump, WFB unsealed automatic self-priming pump and CYZ self-priming centrifugal pump

Roots vacuum pump and maintenance of exhaust filter element of treatment of vacuum drop 

Do you know the classification of self-priming sewage pump

Sewage pump is a kind of pump product which is connected with pump and motor and works underwater at the same time. Compared with general horizontal pump or vertical sewage pump, sewage pump has compact structure and small floor area. The installation and maintenance are convenient. Large sewage pumps are generally equipped with automatic coupling devices, which can be installed automatically. The installation and maintenance are quite convenient.
According to different sewage discharge modes, sewage pumps can be divided into Self-priming sewage pump, submerged sewage pump, knife type sewage pump and automatic mixing sewage pump. The vertical sewage pump adopts a unique single blade or double blade impeller structure, which greatly improves the sewage passing capacity, and can effectively pass through the fiber material 5 times the diameter of the pump and the solid particles with a diameter of about 50% of the diameter of the pump. The vertical sewage pump, which can be moved or fixed, is used for the sewage, suction and discharge in construction, farmland drainage and irrigation, enterprises and institutions. In addition to conveying sewage, it is also suitable for drainage pump, pulp pump, irrigation, etc.
However, the self-priming sewage pump can also be classified according to the action principle, which can be divided into the following categories:
1. Gas liquid mixing type (including internal mixing type and external mixing type)
Working process of gas-liquid mixed Self-priming sewage pump: due to the special structure of the pump body of the self-priming sewage pump, there is a certain amount of water in the pump body after the pump stops running. After the pump is started again, due to the rotation of the impeller, the air and water in the suction pipeline are fully mixed and discharged to the gas-water separation chamber. The gas in the upper part of the gas-water separation chamber overflows and the water in the lower part returns to the impeller, Re mix with the remaining air in the suction pipeline until all the gas in the pump and suction pipe is discharged, complete self suction and pump water normally.
2. Water ring wheel type
The water ring wheel type self-priming sewage pump combines the water ring wheel and the water pump impeller in a shell to discharge the gas with the help of the water ring wheel to realize self-priming. When the pump works normally, the passage between the water ring wheel and the pump impeller can be cut off through the valve, and the liquid in the water ring wheel can be discharged.
3. Jet type (including liquid jet and gas jet)
The jet type self-priming sewage pump is composed of a centrifugal pump and a jet pump (or ejector). It relies on the injection device to create a vacuum at the nozzle to realize suction.

EVP's Dry Chlorine Liquid Ring Compressor 

27 basic knowledge points of centrifugal pump!

1. What is the main working principle of centrifugal pump?
The motor drives the impeller to rotate at a high speed, causing the liquid to generate centrifugal force. Due to the action of centrifugal force, the liquid is thrown into the side channel and discharged out of the pump, or into the next stage impeller, so as to reduce the pressure at the inlet of the impeller and form a pressure difference with the pressure acting on the suction liquid. The pressure difference acts in the liquid suction pump. Due to the continuous rotation of the centrifugal pump, The liquid is continuously inhaled or discharged.
2. What are the functions of lubricating oil (grease)?
Lubrication, cooling, flushing, sealing, vibration reduction, protection and unloading.
3. What is the three-stage filtration of lubricating oil before use?
Level I: between the original lubricating oil barrel and the fixed barrel;
The second stage: fixed between the oil barrel and the oil pot;
Level 3: between the oil pot and the refueling point.
4. What is the "five determinations" of equipment lubrication?
Fixed point: add oil at the specified point;
Timing: oil the lubricating parts according to the specified time and change the oil regularly;
Quantitative: quantitative refueling according to consumption;
Quality determination: select different lubricating oils according to different models and keep the oil quality qualified;
Fixed person: each refueling part must be in the charge of a special person.
5. What is the harm of water in pump lubricating oil?
Water can reduce the viscosity of lubricating oil, weaken the strength of oil film and reduce the lubrication effect.
Water below 0 ℃ will freeze, which will seriously affect the low-temperature fluidity of lubricating oil.
Water can accelerate the oxidation of lubricating oil and promote the corrosion of low molecular organic acids to metals.
Water will increase the foaming property of lubricating oil and make the lubricant easy to generate foam.
Moisture can rust metal parts.
6. What are the maintenance contents of the pump?
Carefully implement the post responsibility system, equipment maintenance and other rules and regulations.
The equipment lubrication shall be "five fixed" and "three-level filtration", and the lubrication equipment shall be complete and clean.
Maintenance tools, safety facilities, fire-fighting equipment, etc. shall be complete and placed neatly.

High temperature in two-stage rotary vane vacuum pump?

Phenomenon and cause of magnetic slip in magnetic pump

(1) Sliding magnetic phenomenon when the magnetic pump is overloaded or the rotor is stuck during operation, the driving and driven parts of the magnetic driver will slip off automatically. At this time, the driven parts will not operate synchronously with the driving parts, resulting in demagnetization. It is characterized by: ① the pump outlet pressure decreases. ② The motor current of the pump decreases. ③ The temperature at the magnetic linkage rises rapidly. Under the action of the alternating magnetic field of the active rotor, the permanent magnet on the magnetic driver will produce eddy loss and magnetic loss, resulting in the temperature rise of the permanent magnet, the magnetic force of the magnetic driver will fail, and the sliding bearing of the pump will be damaged at the same time. (2) The reasons for the magnetic slip of the magnetic pump are as follows: ① the barrel pump was originally used, and the outlet pipeline of the pump is DN100. After replacing the pump, the outlet pipeline is required to be DN65. However, due to the difficulty of construction, the original DN100 pipeline is still used. When operating the pump in this way, it is difficult to control the opening of the valve at the pump outlet, which is easy to cause overload operation of the pump and produce sliding magnetism. ② Because the density of liquefied gas changes greatly with temperature and pressure, when using magnetic pump to transport liquefied gas, the working condition of the pump changes greatly, which increases the possibility of cavitation and produces sliding magnetism. ③ The operator's sense of responsibility is not in place, and the liquid level of the storage tank cannot be grasped in time during the operation of the magnetic pump, which makes the pump empty and produce sliding magnetism. ④ The magnetic torque is too small. ⑤ The magnetic sleeve of the magnetic coupling of the pump was not cleaned in time, and there were many attachments to the magnetic sleeve, which reduced the magnetic force and caused sliding magnetism during operation. The phenomenon and causes of magnetic slip in magnetic pump are analyzed.

How to add lubricating oil without stopping roots vacuum pump?

Why does fluoroplastic self-priming pump absorb water very slowly

Self priming pump is a centrifugal pump that can automatically pump water up without filling the suction pipeline with water. There are many structural types of fluoroplastic self-priming pump.
Generally speaking, the structure of fzb self-priming pump adopts self-priming structure, the pump body adopts metal shell lined with fluoroplastic, all flow-through parts are made of fluoroplastic alloy, the pump cover and impeller are made of metal insert wrapped with fluoroplastic, sintered and pressed as a whole, the shaft seal adopts external advanced bellows mechanical seal, and the static ring adopts 99.9% alumina ceramic (or silicon nitride), The moving ring is made of Teflon filling material, and its corrosion resistance, wear resistance and sealing performance are very stable.
Fzb fluoroplastic self-priming pump sometimes experiences slow water absorption during use. Here are the reasons and solutions:
1. When the fluoroplastic self-priming pump is used for the first time, the pump body needs to be filled with liquid to absorb water normally. If the pump cavity is not filled with water, resulting in water shortage in the pump control, there is air in the pump cavity that needs to be discharged by the self-priming pump, which will greatly prolong the water filling time of the self-priming pump, Therefore, the pump control must be filled with liquid to make the self-priming pump water quickly.
2. Air leakage may not be found in the suction pipe of the self-priming pump, such as weak air leakage at the pipe joint, flange joint and quick joint joint joint, which may be the reason for the slow water filling and rotation of the self-priming pump, Therefore, before installing the pipeline, both ends of the pipeline must be completely sealed, and then pressurize or pump negative pressure to test whether the pipeline has air leakage points, and then install the fixed pipeline after confirmation, If the pipeline has been installed, the method to check the suction leakage point of the self-priming pump is to fill the self-priming pump with liquid and turn it on for 5-6 minutes, then stop the machine, and then close your ears to the place where the leakage is suspected, listen to whether there is a whistling sound, find the leakage point and repair it.
3. The self-priming height of fzb self-priming pump is about meters. Due to the error between the self-priming height published by some manufacturers and the high bottom of the actual self-priming pump, it will lead to the difficulty of filling water for the self-priming pump after the user is installed according to the standard of more than 3m during installation and use. In this case, you can consider replacing the high suction pump, The suction pipe diameter of the pump can also be reduced, which can effectively improve the self-priming height of the self-priming pump. After reduction, the outlet should also be reduced by one grade, but the flow will also be reduced.
4. Due to the fierce competition in the market, many manufacturers have made the self-priming pump body relatively small, so the cost will be reduced. After the pump body is small, there will be little liquid stored by the self-priming pump, and the self-priming capacity of the self-priming pump itself will be very general. At the same time, they do not consider optimizing and upgrading the self-priming performance, which will reduce the self-priming capacity of the self-priming pump, Therefore, you will find that this kind of self-priming pump with small pump body has very low self-priming capacity, and it is likely to add water again every time in use.
5. Due to the design problems of some self-priming pump products, the steam water separation speed is very slow and the separation effect is poor. It is difficult to feel the gas discharged from the exhaust valve of the self-priming pump in the process of self-priming and exhaust, which indicates that the steam water separation effect of the self-priming pump is not good.
6. The reason for the slow suction of the self-priming pump may also be that the user has changed the diameter of the suction pipe of the self-priming pump during installation and use, making the diameter larger. Due to the larger diameter, there will be more air in the pipe and reduce the suction of self-priming. For example, sucking a small suction pipe and a large suction pipe with a mouth clearly feels that the suction of the small pipe is large.

What is the material of rotary vane of rotary vane vacuum pump? Is it fiberglass or carbon fiber?

Causes of high noise of water injection pump

The water injection pump vibrates and makes large noise, which is caused by pump evacuation, cavitation or mechanical failure.
(1) The pump is not vented before starting or the air in the pump is not completely vented;
(2) The impeller and inlet pipeline support are not fixed firmly and the filter screen is blocked, resulting in insufficient water supply;
(3) The connection part at the inlet end of the pump or the sealing packing is not tightly sealed and has air leakage;
(4) The bearing bush is seriously worn and the clearance is too large;
(5) The pump displacement is controlled too large or too small, causing cavitation or pump suffocation;
(6) Impeller damage or vibration caused by rotor imbalance;
(7) The pump shaft is bent or the pump shaft is not concentric, resulting in mutual friction between the rotor and stator;
(8) The balance disc is seriously worn and fails, resulting in excessive axial thrust;
(9) The foundation bolt is not fixed firmly, which makes the motor vibrate and then causes the pump vibration, or the construction, design and installation quality is unqualified;
(10) The coupling is not concentric, the connecting bolt is loose or the damping rubber ring is damaged, resulting in imbalance and non vibration absorption.

EVP VACUUM NEW OIL FREE SCROLL VACUUM PUMP ON THE MARKET 

Fluoroplastic magnetic pump

Fluoroplastic magnetic pumps are widely used in various fields of national economic construction, such as petrochemical industry, mining, metallurgy, electric power, water conservancy, national defense, farmland irrigation and drainage, urban water supply and drainage, etc. Because ordinary magnetic pumps are cast parts, they are generally delivered after simple grinding at the factory. The fluid surface of the pump is rough, and the resistance of the fluid in the pump is too large, which will increase the shaft power of the pump and cause a waste of energy. In addition, due to the different operating environment of the pump, the flow-through parts of the pump, such as impeller and shell, will be infringed to varying degrees, and the impeller will fall off and damage in the form of groove and honeycomb, which will affect the operating efficiency of the pump. Therefore, it has far-reaching social benefits to improve and maintain the efficiency of water pump and reduce energy consumption.
Yuanxiang pump valve fluoroplastic magnetic pump
1. Fluoroplastic magnetic drive pump has the advantages of stable and reliable performance, good sealing performance, beautiful appearance, convenient use and maintenance, etc. It plays a great role in improving product quality, reducing running, emitting, dripping and leakage, preventing pollution and improving the environment.
2. It is suitable for extracting corrosive liquid from bottles, barrels, cylinders, pools or other containers.
3. It is suitable for chemical, petroleum, metallurgy, power station, food, pharmaceutical, synthetic fiber and other departments to transport corrosive media with temperature of various ℃ or media with high physical and chemical properties.
4. Suitable for pumping clean water, containing abrasive substances harmful to ordinary pump body materials, suspended substances corrosive to stainless steel materials and non explosive substances; At the same time, it is widely used for water supply.
5. Suitable for heating, air conditioning, cooling and circulation systems, fire fighting, irrigation, rainwater storage engineering, daily use, civil, horticultural and industrial purposes;
6. Suitable for occasions where low noise is necessary;
7. It is suitable for pressurization and conveying corrosive and explosive water or liquid

If you want the dry screw vacuum pump to have a long service life, these 12 maintenance points should be done in place 

Analysis of asphalt insulation pump in use

Article source: unknown editor: screw pump Author: screw pump publication time: November 10, 2011 10:49 font size: [large, medium and small]
It is often encountered in practice that the head of asphalt insulation pump is lower than that of the design working point. One situation is that the pump head is too high in pump selection, but the pump is used with lower head in actual use; Another situation is that the operating point of the pump is not easy to determine in use. In other words, the flow of the pump needs to be adjusted frequently; There is also a case that the pump needs to be used in different places frequently These three conditions may overload the pump and affect the reliability of the pump It can be said that the application range of pumps without full head characteristics (including submersible sewage pumps) will be limited to a great extent
The non overload design technology of asphalt insulation pump is used in different fields and plays an important role and value in the industry. The following briefly introduces the use of asphalt insulation pump in the industry and uses it according to the corresponding ways and methods to ensure the good use value and function of asphalt insulation pump in use
In the general centrifugal oil pump, the power always increases with the increase of flow, that is, the power curve is a curve rising with the increase of flow, which will bring a problem to the use of asphalt insulation pump: when the pump runs at the design working point, the power of the pump is less than the rated power of the motor, and the use of this pump is safe; However, when the pump head decreases, the flow will increase (as can be seen from the pump performance curve) and the power will increase When the flow exceeds the flow at the design operating point and reaches a certain value, the input power of the asphalt insulation pump may exceed the rated power of the motor, resulting in motor overload and burning When the motor is overloaded, either the protection system acts to stop the pump; Either the protection system fails and the motor burns out

Roots vacuum pump unit of treatment of high current 

What are the common tools for repairing vacuum pump?

1、 Common tools
1. One set of general fitter tools;
2. Box wrench, socket wrench and Allen wrench set;
3. Special oil drill - for pulling and inserting rubber pipe;
4. Cutter holder - for rounding rubber washer;
5. Rubber knife - draw a straight rubber block and cut a rubber tube (it can be ground with a saw blade);
6. Punches - various punches are used to punch screw holes of rubber pads;
7. Crank winch - several crank winches can be self-made to wind leaf springs, and the diameter is selected according to the inner diameter of the spring;
8. Scissors and blade;
9. Three "0" large flat plates;
10. Others: including camera, brush, brush, various emery abrasives, coarse and fine metallographic sandpaper, etc.
2、 Auxiliary oil, soluble Vitex and chemical reagent
1. Gasoline, alcohol, acetone, benzene and other solvents;
2. Castor oil - for taking and inserting vacuum rubber tube, lubrication and auxiliary sealing;
3. Kerosene - thickened and refined valve sand is used as abrasive;
4. Shellac paint solution - auxiliary seal;
5. Vacuum sealing grease, vacuum sealing wax and other sealants;
6. Caustic soda - for boiling and washing vacuum rubber.
3、 Instruments for metering and leak detection
1. Micrometer (micrometer), caliper (vernier card), angle ruler ("grade 0"), marking ruler, depth ruler, dial indicator, etc.
2. High frequency spark leak detector, thermocouple meter, ionization meter (or combined vacuum meter), Michaelis meter, etc.
3. Helium mass spectrometer leak detector and pumping speed test device can be prepared if possible.

The relationship between absorbed power and shaft power of the motor

What if the vacuum degree of imported vacuum pump is low?

During the operation of the imported vacuum pump, sometimes the vacuum degree of the imported vacuum pump is low. So, how can we find out the cause of the problem and solve the problem? Let's take a look:
1、 Air leakage of inlet vacuum pump
1. The sealing ring leaks. Check the sealing condition of all seals and replace damaged sealing rings. 2. The gasket of ballast valve is damaged or not tightened. The gasket should be replaced and the ballast valve tightened. 3. The exhaust valve is damaged and the seal is not good. The valve plate should be replaced. 4. The diaphragm is pressed too much, and the vacuum pump chamber is deformed and leaking. The vacuum pump chamber should be repaired or replaced. 5. Air leakage is caused by poor oil seal on the end face of the imported vacuum pump. Remove the end cap, check for sundries or unevenness, and clean or repair it.
Imported vacuum pump
2、 There is a problem with the imported vacuum pump oil. 1. The oil level of the inlet vacuum pump is too low. The center line of the oil standard shall be filled with enough oil. 2. The engine oil is polluted and deteriorated. The oil should be replaced with a new one. 3. The brand of oil does not match. Replace the vacuum pump oil of the specified brand. 4. The oil circuit is blocked and an appropriate amount of oil is not maintained in the vacuum pump chamber. Check the oil circuit and the oil inlet of the oil valve to keep the oil circuit unblocked.
3、 The inlet filter screen of the inlet vacuum pump is blocked. The filter screen shall be removed and cleaned before installation.
4、 The rotor spring of the imported vacuum pump is deformed or broken, and the rotor fails. The spring deformation shall be repaired or replaced so that the rotor product is in good contact with the rotor.

The Mechanical seal pump and the gland packing seal pump can be directly interchangeable sealing mode ?

Do you know the anti foaming property of vacuum pump oil

 

When the vacuum pump is working, air bubbles always cause bubbles, especially when there are active additives in the oil, and the foam is not easy to disappear. The use of foam in smooth oil will destroy the oil film, not only cause the friction surface to attack or increase wear, but also cause the oxidation of smooth oil to undergo metamorphosis. The gas in the operating vacuum system is discharged from time to time in the sealed vacuum pump oil layer. The discharged gas will generate a large number of bubbles on the surface of the oil layer and overflow from the exhaust hole of the vacuum pump, resulting in oil loss and equipment pollution. The pump oil with anti foaming agent has made obvious progress in anti foaming effect.
Confirmation of seals:
(1) Confirm whether the installed seal is the same as the required model.
(2) Before installation, carefully compare with the general assembly drawing to see if the number of parts is correct.
(3) For mechanical seals with parallel coil spring drive, the spring can be divided into left and right rotation, which must be selected according to the rotation direction of the rotating shaft.

How to resolve the corrosive medium problem in the vacuum pump?

How to distinguish the quality of vacuum pumps on the market

Through news reports, we learned that many people just bought vacuum pumps, which soon had problems such as oil leakage and belt cracking. In terms of losses, the amount is not large, but the problem is very serious. Here, Xiaobian can only say that fake and shoddy products are rampant. In the past, when we didn't have data, we couldn't judge whether it was quality or operation. However, a large number of data show that the quality of vacuum pumps on the market is worrying. Some products are not energy-saving, but whether they can be used.
Many people know the brand very well and pay too much attention to the price without considering the product quality, function and product parameters. If you use dim sum a little, you can know the product quality problem of vacuum pump.
Absence of market supervision. The supervision, testing and supervision of products on the market are relatively poor. Many counterfeit products have not been seized and cannot be managed at all. After the revocation of the production license of the compactor, this phenomenon may be more, which requires the joint efforts of enterprises, shopping malls and occupations to eliminate the fittest.
There is fierce competition among vacuum pump peers. It is not only reflected in digging customers, talent, comparing prices and selling scripts, but also in the search for product quality and the protection of orderly career development. As long as the career is well developed, individual enterprises can develop well.

Why does roots vacuum pump unit trap oil 

What is the role of improving the potential level of vacuum pump products? How to maintain?

 

The quality application of vacuum pump can speed up the embodiment of equipment performance strength, improve the development advantages of its quality strength, fully accelerate the overall drive of product value performance, make the vacuum pump realize the development advantages of its product value ability and enhance the sustainable development of its quality practice advantages in the process of reliable application and continuous development of performance application effect.
Highlight the improvement of vacuum pump product force, enhance the exertion of its product utilization advantages, and improve its quality and practical effect with the overall driven product force. The oil-free vacuum pump accelerates the exertion of its product utilization ability, continuously accelerates the embodiment of equipment value and performance, realizes the development of product utilization advantage ability, and further enhances the exertion of its quality strength with the development of overall application.
Vacuum pump
In the actual development process of accelerating the application of vacuum pump products, it has promoted the continuous promotion of its product strength, enhanced its overall application strength, accelerated its product application and advantages, enhanced its quality and practical performance, highlighted the development force of its quality and practical ability, improved the practical performance of the equipment and accelerated the overall improvement of its quality strength, It improves the driving force of its product application performance, enhances its product strength, and enhances the overall driving force of its product performance.
The vacuum pump unit reflects the simplification of single pump performance. The system combines various equipment together, which not only enhances the performance strength of products, but also greatly enhances the exertion of equipment application advantages, better provides high-performance equipment application for production, fully reflects the application strength of the unit, and further accelerates the driving of product application strength.
On the basis of accelerating the productivity development of the vacuum pump unit, the application characteristics of the product fully reflect its inherent application advantages. In the development process, the advantages of the vacuum pump unit develop from product strength to performance. The reasonable application of vacuum pump unit is a promotion to the production development of enterprises, which should be directly applied in combination with the performance advantages of its products.

water ring vacuum pump negative pressure unit of typical configuration

What about the heating of vacuum pump motor?

 

In the process of using the vacuum pump, friends have encountered the sudden feeling of high motor temperature. At this time, you need to check one by one to eliminate problems.
1、 Causes of high motor temperature
1. The motor has high power, large working current and high calorific value.
2. The fan speed is low, the air pressure is small, and the air volume is small.
3. The number of fan blades is small, resulting in small air volume.
4. Dust and oil stain adhere to the motor, reducing the heat dissipation capacity.
5. The bus voltage where the vacuum pump motor is located is 380V. Due to the uneven cable voltage drop and load distribution, the actual voltage applied by the motor is only 365v. The low voltage causes large operating current.
2、 Measures to solve high motor temperature
The machine power and speed match the SK vacuum pump and cannot be changed. The fan is installed on the motor spindle. The motor speed determines the fan speed and cannot be replaced. Although increasing the number of fan blades can play a certain role, it is difficult to find dynamic balance after increasing the number of blades. If the alignment is not good, the vibration of the motor will increase.
1. Lengthen the original fan cover by 40cm and install an axial fan with the same diameter as the internal fan cover. The motor power of axial flow fan is 850 W, the speed is 1489 R / min and the voltage is 380 v. Keep the original fan. The axial flow fan is controlled by another power supply, and the axial flow fan is not interlocked with the main motor. After the vacuum pump is started, the axial flow fan shall be started in time. 30 minutes after the vacuum pump is stopped, the axial flow fan shall be stopped to fully cool the main motor.
2. Regularly remove the motor dust, keep the motor heat sink clean and increase its heat dissipation capacity.
3. Adjust the bus voltage of vacuum pump to 400V
4. After voltage adjustment, the operating current of the vacuum pump is reduced to 210a and the calorific value is relatively reduced.
5. The insulation aging speed of the main motor slows down and the service life is prolonged.
There are many unexpected problems when using. We can adjust our vacuum pump according to the instructions here. After use, do not forget to maintain the vacuum pump regularly.

What about the preparation before operation of water ring vacuum pump and insufficient negative pressure?