How to check the oil seal leakage of vacuum pump

No matter whether the water ring vacuum pump is pumping air or water, there should be no leakage. Check the oil seal carefully before use to see if it leaks. Oil seal is a kind of seal often installed in water ring vacuum pump equipment, which has good sealing effect. How to check whether the vacuum pump oil seal leaks? 

1. The water level indicator in the vacuum system is not broken or leaking.

2. Close the drain valve on the steam side of the condenser to prevent leakage.

3. Check whether the water ring vacuum pump is under negative pressure, whether the water level of the low pressure heater is normal and whether the drain valve is sealed.

4. Check whether the exhaust steam safety valve of low pressure cylinder is in good condition and there is no air intake.

5. Check whether the gravity return water of the speed control feed water pump leads to the condenser. If the return water volume is small and the water seal bag cannot be sealed, the gravity return water from the sealing water of the water supply ring vacuum pump should be poured into the groove.

6. Check the area connecting the vacuum exhaust pipe and the cylinder for air leakage. When the load drops, the air leakage will be reduced, while when the load rises, the vacuum will increase slightly.

7. If the water seal, pipe, flange or weld of vacuum system valve is not firm, especially the pipe and valve port from expansion tank or boiler start-up separator to condenser.

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The reason why single stage centrifugal pump can't pump water

Although the single-stage centrifugal pump has a certain degree of self-priming capacity, it is still necessary to ensure that the inlet pipe is completely sealed when it is installed. 

The reason why the centrifugal pump does not pump water may be that the user does not install it correctly. The correct installation and use of centrifugal pump suction pipe should be installed at the bottom of the pool bottom valve. Before starting, the whole pump body and inlet pipe must be filled with water. The outlet valve must be closed before starting, and then the outlet valve shall be opened slowly after opening the centrifugal pump. Each single-stage centrifugal pump has different self-priming performance according to different models. When choosing the model, you must know each single-stage centrifugal pump.

The reason why the single-stage centrifugal pump can not pump water may also be that the self-priming exceeds the effective self-priming height of the centrifugal pump. The self-priming head of conventional single-stage centrifugal pump is within 3M. If the height exceeds this height, self-priming centrifugal pump or high suction self-priming pump with vacuum auxiliary device must be used.

The reason why the single-stage centrifugal pump can not pump water may also be due to the blockage of debris in pump cavity, impeller, bottom valve, pipeline and other places. If the single-stage centrifugal pump is sealed and has leakage, it will also lead to the failure of pumping.


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Roots Vacuum Pump

Axial force of screw vacuum pump

The axial force of the screw vacuum pump may be caused by the uneven pressure on the suction and discharge ports, resulting in uneven pressure on both sides of the impeller, which is not completely symmetrical and produces axial force. But how to solve the axial force? 

Although we need to clean up the axial force of the screw vacuum pump, if we clean it thoroughly, the rotor will rotate unsteadily. Therefore, it is necessary to compensate the amount of 30 by bearing in the design, so that the bearing at the non driving end of reciprocating vacuum pump is usually angular contact bearing, because this method can be used to withstand higher axial force.

The general solution is to symmetrically install the balance disk and impeller of the screw vacuum pump, and the single-stage pump generally has a balance hole on the impeller. Secondly, there is a way to install balance blades on the impeller to balance the axial force.

Screw vacuum pump will be affected by many factors in the process of operation. Any small problems may affect the normal operation. Therefore, regular inspection and maintenance are needed to avoid problems and reduce efficiency.

Water Ring Vacuum Pump Structure

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Dry Scroll Vacuum Pump

Volume and application of liquid ring vacuum pump cavity

In the process of using liquid ring vacuum pump, it is a self-priming pump, and its products are gradually adopted by mining, chemical industry, light industry, petroleum and other industries. In the process of industrial production, there are many technological processes, such as vacuum water diversion, vacuum evaporation, vacuum moisture regain and so on. 

Liquid ring vacuum pump can be widely used, mainly because of the rapid development of its application technology. In the process of using the equipment, the gas compression in the water ring pump is isothermal, so it can pump out its explosive and flammable gas, and it can also pump out the gas containing water and dust in the process of using.

When the pump is equipped with a proper amount of impeller, it can be thrown into the water directly in the process of working.

The lower part of the water ring of the liquid ring vacuum pump is just tangent to the impeller, and the inner surface of the upper part of the water ring is just in contact with the top of the blade. At this time, a crescent shaped space will be directly formed between the water ring and the impeller, which is also equivalent to several small cavities.

In the process of using liquid ring vacuum pump, it mainly depends on the change of pump cavity volume to effectively realize the function of exhaust and suction. The structure of the equipment is relatively simple, and its accuracy requirement is not high in the process of production, so it is very easy to process.

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Overall arrangement structure and installation of vacuum pump

Now the field of vacuum pump is becoming more and more extensive, so now there are more kinds of products. Now with the continuous development of vacuum technology and the requirements of scientific research field for its pressure are becoming wider and wider. Basically, the vacuum pumping system composed of several vacuum pumps can meet the production after common pumping. 

At present, the departments concerned are quite familiar with the working pressure range of the vacuum pump, so any type of vacuum pump will not be fully applicable to all working ranges, and different types of vacuum pumps can only be selected according to different working requirements and pressure ranges.

In order to be more convenient to use, vacuum pumps with different performance will be combined according to their different requirements in the process of vacuum technology. The use of products is an essential main pump in the application of vacuum technology in various industries of our national economy.

The overall layout structure of the vacuum pump will directly determine the overall structure of the pump. The vertical structure, the horizontal device of the air inlet and exhaust port and the connected pipeline are more convenient, but the center of gravity of the pump is relatively high when it is used, so its stability performance will be poor when it is running at high speed.

When the horizontal pump is installed, its exhaust port needs to be below, while the air inlet needs to be above. Sometimes, in the process of installation, for the convenience of system pipeline installation and connection, the exhaust port can be connected from the horizontal direction, and the direction of air inlet and exhaust is perpendicular to each other.

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Roots Vacuum Pump 

micro vacuum pump exhaust condition

If the micro pump can not pump water to the equipment effectively, it will need to be used in the process of low water pumping. 

The advantage of the micro vacuum pump in the process of using is that the equipment directly vacuumizes when it does not contact with water. After the vacuum is formed in the equipment, it needs to rely on the air pressure to pump up the water pressure, and then it starts to pump water. In the process of using, it may directly vacuumize because there is no water in the pump. After the vacuum is formed, it depends on the air pressure to pump up the water pressure, and then it is turned on Start pumping.

Micro vacuum pump in the process of pumping resistance, and then according to its judgment conditions to narrow the scope of selection, but in the process of using, we need to consider the problem of the exhaust end of the equipment in time, so as to better select the scope of its choice.

In the actual application process of micro vacuum pump, the exhaust condition faced by the equipment is different. One is that the exhaust is relatively smooth and directly to the atmosphere. The other is that the exhaust resistance is relatively large, such as valves, large damping sensors and other parts on the exhaust pipeline.

In the process of design and manufacture of modern micro vacuum pump, different exhaust conditions need to be treated differently. The exhaust port of the equipment allows a large resistance value. Such a parameter is to calibrate the exhaust capacity of the pump. In this way, strict technical means can be used to determine its type selection.

Welded Bellows Industry Application

Rotary Vane Vacuum Pump

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Talk about vacuum pump

Water ring vacuum pump (water ring pump) is a kind of coarse vacuum pump. The limit pressure it can obtain is 2.66-9.31kpa for single-stage pump and 0.133-0.665kpa for double-stage pump. Water ring pump can also be used as compressor, it belongs to low pressure compressor, its pressure range is (1 ~ 2) x105pa gauge pressure (under specific conditions). Water ring pump is widely used in many processes of petroleum, chemical, machinery, mining, light industry, papermaking, power, metallurgy, medicine, food and other industries, municipal and agricultural sectors, such as vacuum filtration, vacuum feeding, vacuum degassing, vacuum evaporation, vacuum concentration and vacuum moisture regain, etc Flammable, explosive gas, in addition to dust, water gas can be pumped, therefore, the application of water ring pump is increasing. 

Water ring pump is composed of impeller, pump body, suction and exhaust disc, water ring formed by water in the inner wall of pump body, suction port, exhaust port, auxiliary exhaust valve, etc.

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How to use screw vacuum pump

Screw vacuum pump will be affected by air leakage in the process of use. Many users think that this is a quality problem of the equipment, which has been replaced by new equipment. However, the cause of air leakage is not only the quality problem, but also the front and rear covers are different? In other words, the front and rear covers of the screw vacuum pump have different axial degrees, and the result is the same as the bearing deflection. 

With the increase of the liquid ring temperature, the saturated vapor pressure also increases, which reduces the vacuum degree of the screw vacuum pump, but has no effect on the exhaust pressure? Tighten the connecting bolts and stuffing box of the screw vacuum pump, tighten the connection between the pipeline, instrument and other parts, or replace the gasket and stuffing.

For the leakage of the screw vacuum pump, putty can also be used as a temporary remedy to make the bearing deflect, so that the impeller inclines and is installed in the pump body of the screw vacuum pump. The axial clearance of single acting pump is uneven. When the impeller rotates, the side cover must have certain friction, and the side cover and the impeller end face will be scratched.

When the gas in the compression chamber passes through the increased gap, the axial gap increases, and a large amount of gas leaks into the suction chamber, thus reducing the vacuum pressure or discharge pressure of the screw vacuum pump. At this time, the bearing of screw vacuum pump must be removed for maintenance, and then installed correctly. Screw vacuum pump is a kind of pump device, which completes the suction and exhaust work produced by synchronous high-speed reverse rotation in the pump shell.

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Roots Vacuum Pump

Roots vacuum unit used in vacuum metallurgy industry

Roots vacuum unit is widely used in vacuum degassing, vacuum melting, liquid steel vacuum treatment, space simulation, low-density wind tunnel and other devices to extract corrosive gas in vacuum metallurgy industry. It can also be used in distillation, evaporation, drying and other production processes of chemical industry, food, medicine, motor manufacturing and other industries. 

When working, the pumped gas enters between the rotor and the pump body through the air inlet. At this time, a rotor and the pump body separate the gas from the air inlet, and the separated gas is sent to the exhaust port during the continuous rotation of the rotor. Space is in a closed state, therefore, there is no compression and expansion. But when the peak of the rotor turns to the edge of the exhaust port, because the pressure of the V part is lower than that of the exhaust port, in order to make the pressure in the connected volume uniform, the gas will diffuse from the exhaust port to the V area, and the diffusion direction is opposite to the rotation direction of the rotor. When the rotor rotates again, the gas at V is compressed to the exhaust port to discharge it. At this time, the other side of the rotor is connected with the air inlet to inhale the gas. When the rotor rotates continuously, the above air extraction process is repeated to continuously discharge the gas flowing in. This working process is equivalent to that the rotor space increases from a small value to a large value, and then decreases from a large value to a small value. This is the volume principle of Roots vacuum pump.

Vacuum Pump Is Widely Used In Chemical Industry

Rotary Vane Vacuum Pump

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Oil change of vacuum pump

Because the chemical or pharmaceutical process gas will contain flammable, explosive and corrosive gases to varying degrees, which is why the dry vacuum pump for us also needs special treatment. For the simple internal structure of dry screw vacuum pump, the two rotors and pump cavity should be treated with anti-corrosion. At this time, we should pay attention to the selection of nickel phosphorus coating and Teflon coating. 

Claw vacuum pump is more difficult to do anti-corrosion treatment, there is almost no way to do surface treatment between all levels of diaphragm, so the anti-corrosion coating on the rotor surface is relatively easy, and it will not be damaged during assembly. Oil free vortex vacuum pump is only suitable for pumping clean gas, at this time it can not pump flammable, explosive and corrosive gas.

When it comes to the oil change of vacuum pump equipment, we should pay attention to the oil change once after the vacuum pump equipment has been working continuously for three to six months. In areas with high humidity, the pump working in wet season, or the pump is heavily polluted by pumping gas. In this regard, to a large extent, we should pay attention to shortening the oil change time according to the specific situation Between.

When changing the oil of vacuum pump equipment, first of all, it is necessary to remove the vacuum system from the pump, then it is also necessary to pad up one end of the chassis motor, open the oil drain plug to drain the oil, rotate the vacuum pump, cover the exhaust port, so that all the dirty oil in the cavity is discharged from the oil drain port, and then add 100-500ml new oil from the air inlet port, continuously rotate for more than 5-10 revolutions, and clean the interior according to 3-5 After the special dirty oil is discharged, install the oil drain plug, level the pump, add new oil from the air inlet and oil filling hole respectively, and the oil change is completed.

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2BV water ring vacuum pump type determination

To determine the model of 2BV water ring vacuum pump, we should first determine which series of pump to choose according to the process parameters of the device, the physical and chemical properties of the conveying medium and other parameters, combined with the structural characteristics and applicable station of our company's products; then determine the rated flow of 2BV water ring vacuum pump; thirdly, we should also determine its rated head; and then determine the 2BV water ring vacuum pump Rated motor. 

When determining the model of 2BV water ring vacuum pump, you should also check the type spectrum of the selected series of pumps, the corresponding flow and head in which model box. At this time, you can preliminarily determine the selected model. Usually, under different speeds, you may choose one model. For checking the performance curve of the initially selected model, check whether the NPSHr of the pump is consistent Meet the npsha requirements of the unit.

When selecting 2BV water ring vacuum pump, pay attention to check the performance curve and check whether the rated working point of the selected model falls in the high efficiency working area of the pump. The final model of 2BV water ring vacuum pump is determined by comprehensively comparing the efficiency, speed (the lower the speed, the longer the service life) and price of the pump.

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Roots Vacuum Pump

vacuum pump unit connection mode

When wiring the vacuum pump unit, it should be noted that half of the ring must be pressed with polyester insulating tape, 8-12 layers should be wrapped, and then two layers of plastic tape should be wrapped for strength; when wiring the vacuum pump unit, its cable copper core should be peeled out about 30-35mm long, and the copper wire should be wiped clean with emery cloth to make it bright, and the external connection should also be carried out Strip the copper wire of three core cable 30-35mm and clean it with emery cloth. 

For the wiring of vacuum pump unit, the three core cable and the copper wire stripped from the external cable will be inserted, and then a thin copper wire will be tied tightly according to the drawing, the remaining part will be cut off, and the scissors will be used to press flat to prevent hand binding. When wiring, the three wire ends of vacuum pump should be soldered firmly with solder, and the surface of the welding head should be smooth, without burr and false welding If the welding is firm or not smooth, the vacuum pump should be re welded until it meets the requirements.

For the wiring of vacuum pump unit, three wires must be wrapped together with plastic tape, and two layers shall be wrapped. The layer shall be more than 50 mm above the end of the insulation layer of each wire, and the second layer shall be more than 50 mm above the end of the layer. After wrapping, take a basin of cold water to soak the wrapped wire in water safely. After 12 hours, measure the insulation with a 500V megohmmeter, and the insulation shall not be less than 50 megohm, otherwise it shall be re wrapped until it reaches the required value So far.

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Rotary Vane Vacuum Pump

Dry Scroll Vacuum Pump

Reciprocating vacuum pump

The working principle of reciprocating vacuum pump is similar to that of reciprocating pump. During operation, through the action of crankshaft and connecting rod, the piston in the cylinder moves back and forth to achieve the purpose of suction and exhaust. Domestic reciprocating vacuum pump has V-type series. It is composed of body, cylinder, piston, crosshead, crankshaft, connecting rod and valve. When the piston moves back and forth, one end of the piston sucks gas from the vacuum system, while the other end exhausts the gas that has been sucked into the cylinder. 

Reciprocating vacuum pump can be directly used to obtain rough vacuum, and its limit pressure is generally about 10 mmHg (1333 PA). The advantage of using this kind of pump is that it has a larger pumping speed under the condition that the vacuum degree is not high in general food vacuum concentration and vacuum drying.

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Roots Vacuum Pump 

Repair of corrosion and wear of water ring vacuum pump cavity

The water ring vacuum pump is evenly distributed on all surfaces of the equipment, while the latter only occurs locally. Such as pitting corrosion, crevice corrosion, intergranular corrosion, stress corrosion cracking, corrosion fatigue, hydrogen corrosion cracking, wear corrosion, delamination corrosion, etc. 

It is one of the effective anti-corrosion measures to use polymer composite repair material to carry out the surface organic coating anti-corrosion. Surface adhesion protection can be widely used in repairing and pre protecting the parts of abrasion, cavitation and corrosion. It has good chemical resistance, excellent mechanical properties and adhesive properties. Compared with the traditional pressure vessel welding repair, it has the characteristics of simple construction, low cost, safety performance and good repair effect.

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Rotary Vane Vacuum Pump

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water ring vacuum pump selection standard

What is the selection standard of water ring vacuum pump? Many people are very confused, today for you to briefly introduce its selection criteria, I hope to help you. 

1. When the unit works, the vacuum degree is stable, the power consumption is small, and the motor power does not exceed 4kw.

2. The vacuum parameter design is reasonable, the vacuum degree and pumping speed can meet the production requirements. The new vacuum pump with low vacuum and large suction should be selected. The maximum vacuum degree of the pump should not be greater than 90%, and the maximum pumping speed should be greater than 25i / s.

3. High quality water ring vacuum pump has good cooling cycle and sealing device.

4. It is equipped with automatic dewater meter.

5. It has the advantages of flexible movement, easy maintenance and long service life.

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Causes of crankshaft wear of Roots vacuum unit

After using roots vacuum unit for a period of time, the problem of crankshaft wear often occurs. The wear is uneven. The radial wear of main journal and connecting rod journal is mainly elliptical, while the axial wear of crankshaft journal is mainly conical. So, how are these crankshaft wear caused? 

1. Because the oil passage leading to the connecting rod journal is inclined, under the action of centrifugal force, the mechanical impurities in the lubricating oil accumulate on one side of the connecting rod journal under the action of centrifugal force, which accelerates the wear of the Journal on this side and makes the wear of the connecting rod journal cone-shaped.

2. Because of the bending of connecting rod, the center line of cylinder is not perpendicular to the center line of crankshaft, the axial force on the journal is uneven and the wear deflection is caused.

3. The elliptical wear of the journal is caused by the uneven distribution of the force acting on the journal along the circumference. When roots vacuum unit is working, the combined force on the connecting rod journal always acts on the inner side of the connecting rod journal, and the direction is outward along the radius of the crankshaft, resulting in wear on the inner side of the connecting rod journal.

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Roots Vacuum Pump 

Technical transformation of vacuum device of water ring vacuum pump

Water ring vacuum pump is widely used in condenser vacuum system of power plant because of its simple system, high operation efficiency and strong pumping capacity. This paper describes the technical transformation of water ring vacuum pump for water type vacuum pumping device. The transformation results show that after the generator unit is connected to the grid, the monthly accumulated auxiliary power consumption has decreased significantly, and the on grid power has increased significantly. The transformation has achieved the expected effect. 

Due to the problems of low efficiency, large water consumption, poor hot standby effect, low steam extraction efficiency under high vacuum, large space occupied and unsightly in actual operation of water jet ejector device, domestic large and medium-sized units all use water ring vacuum pump as condenser vacuum equipment, and this is also the technical transformation of water ring vacuum pump, in order to improve the circulation of our plant thermal efficiency

It shall be equipped with complete instrument measurement and control device, and the instrument interface shall ensure the accuracy of measured value and reading of medium. The pressure and differential pressure contact signals used for pump interlock and protection are sent out by absolute pressure transmitter to ensure the reliability of their action. The measuring range unit of the instrument shall be the national legal measurement unit. PT100 is used for thermal resistance, 4-20madc is required for analog signal, and passive dry contact is required for switching signal. Contact type is DPDT, and contact capacity is 220vac5a and 220vdc3a (none). The junction box is equipped with cabinet door and door lock. The sampling pipe and sampling valve of thermal control measuring point, including the secondary valve, are welded to avoid the impact of vacuum leakage on the vacuum of the unit.

Vacuum Pump In Vacuum Humidification

Rotary Vane Vacuum Pump

Dry Scroll Vacuum Pump 

How to maintain the return oil of diffusion vacuum pump

What about the oil return from diffusion pump? If the vacuum gauge is not damaged, the oil return is generally not needed to be repaired. The main purpose is to clean the oil of diffusion pump in vacuum chamber. It's better to use gasoline to wipe the vacuum chamber wall all over again, and then wipe it with alcohol again. Oil must be clean is the most important, if there is oil in the room, there will be white film plating, film quality is very poor and other phenomena, not because of the damage of electroplating equipment, but because of oil in the vacuum chamber. 

1. The cooling water is blocked or the water pressure is not enough, which leads to the decrease of cooling capacity, the upper part of diffusion pump becomes hot, and the oil vapor cannot be liquefied well. The solution is to connect the inlet pipe of diffusion pump with 4MPa air source to blow out the scale, and connect the outlet pipe with 4MPa air source. If the scale is large and firm, dilute hydrochloric acid can be added. Or replace the diffusion pump.

2. The heating temperature is too high, because the power of the diffusion pump heater is not consistent with the rated power, too high, resulting in a large amount of steam, which can cause oil return. The problem can be solved by replacing the electric furnace wire.

3. If the oil filling quantity is too high, the steam circulation will be slow and the steam will be trapped when it is compressed to the lower level, which will cause oil return. The control of oil filling amount according to the information provided by the manufacturer can be avoided.

4. Oil oxidation, diffusion pump oil oxidation, viscosity and steam flow are affected, can not reach the injection speed, naturally returned to the vacuum chamber. It can be said that the diffusion pump is removed, the pump core is taken out, cleaned with 120 ° gasoline, then polished, the carbon deposit and black oxide layer are polished off, then cleaned and dried with 120 ° gasoline again, and then installed, the diffusion pump oil or silicone oil is poured in, and the work can be started after heating several times. Prevent contamination of workpiece.

5. If the working time of diffusion pump is more than 8-10 years, or in harsh environment, replacement can be considered. Improve work efficiency and maintenance cost.

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Market of vacuum pump

Vacuum pump is a kind of widely used product with large output and low output value, but it directly affects the performance and quality of vacuum equipment. 

The market of vacuum pump changes dynamically according to the needs of users. The main driving force of market growth comes from the rapid development of semiconductor industry and the increasing application of dry pump and molecular pump. 

There are many vacuum pump manufacturers in China, and the annual sales of all vacuum pumps are about 150 million yuan, which is only equivalent to the annual sales of a vacuum pump in an American company. Through the analysis of the global vacuum pump market, we can see that the market and application fields of various vacuum pumps are constantly changing and developing. China's vacuum pump manufacturing industry has a long history and strong foundation. Domestic real pumps have been applied and verified in various fields. Some pumps have been exported to foreign countries, and have been recognized and praised by foreign users. It should be said that China's vacuum pump manufacturing industry still has a huge development space at home and abroad.

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Roots Vacuum Pump 

Limit pressure of water ring vacuum pump

As each water ring vacuum pump manufacturer's products are different, so the parameters are also different. But their pressure is determined by the structure and quality. Users can judge the limit pressure of water ring vacuum pump according to the following two points: 

1. Limit relative pressure: the relative pressure is how much lower the measured internal pressure is than "atmospheric pressure". Because the air inside the container is pumped, the pressure inside the container is always lower than that outside the container. Therefore, when expressed in terms of relative pressure or gauge pressure, the value must be preceded by a negative sign, indicating that the internal pressure of the container is lower than the external pressure.

2. Ultimate absolute pressure: absolute pressure is the pressure higher than the theoretical vacuum. It compares the absolute vacuum pressure of the theoretical state. Due to the limitation of technology, we can't pump the internal pressure to the absolute vacuum value of 0Pa in any case. Therefore, the vacuum value pumped by the water ring vacuum pump is higher than the theoretical vacuum value.

Steam Jet Vacuum Pump Knowledge

Rotary Vane Vacuum Pump

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Treatment of pumping phenomenon of screw vacuum pump

Screw vacuum pump can remove a large amount of water vapor and a small amount of dust, but the screw vacuum pump may be extracted after long-term use. This kind of pumping phenomenon affects the normal operation of the equipment. This will make the screw vacuum pump unable to perform the corresponding work in the normal working mode. 

1. For the higher screw vacuum pump, it is impossible to directly discharge the atmosphere. If the direct exhaust environment will constitute a screw vacuum pump, there will be too much pressure difference between the suction and discharge ports, which will overload the vacuum pump. Therefore, a higher vacuum must be ensured. Make sure there is open space between the rotors.

2. The front stage pump must be used when using the front stage pump, and then when the pressure in the system is sucked into a certain range, the front stage pump is used to inject the screw vacuum pump, so as to avoid the overload phenomenon of the screw vacuum pump.

In addition, when the rotor turns over continuously, the gas inhaled is drawn into the space between the rotor and the pump shell from the air inlet, and then discharged through the exhaust port. Since the suction space is completely closed, the internal gas in the pump chamber is not tightened and expanded. However, when the top of the rotor turns over the edge of the exhaust port and the space is connected with the exhaust side, a part of the gas returns to the space due to the high pressure on the gas exhaust side, so the gas pressure is high. It suddenly increased. As the rotor continues to move, the gas leaves the pump.

The pumping phenomenon of screw vacuum pump is also related to the usual maintenance work. Regular maintenance and timely detection of maintenance problems can not only reduce equipment failure, but also use the equipment very well.


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Wiring operation of vacuum pump unit

Only remove the cable before using the vacuum pump unit. When installing, you need to re connect the cable yourself. However, attention must be paid to the correct method when connecting cables. Otherwise, it will have a great impact on the use of vacuum pump device. Everyone serves to explain the connection method of vacuum pump device for everyone: 

When the vacuum pump unit wiring, must use polyester insulation tape. When packing, be sure to press half of the first circle and wrap in 8-12 layers. After wrapping, wrap two layers of plastic tape to increase strength. When the vacuum pump unit is connected, the copper core of the cable is stripped about 30-35mm long. Wipe the copper wire with abrasive cloth and strip the copper wire. The copper wire of the external three core cable is also stripped by 30-35mm and cleaned with abrasive cloth.

Insert the wiring of the vacuum pump unit into the copper wire part of the three core cable, strip off the external cable, and then bind it with fine copper wire, cut off the remaining part, and flatten it with scissors to prevent binding hands; at the same time, the three ends of vacuum pump shall be welded separately, and the surface of welding joint shall be smooth without burr and false welding. To ensure that there is no welding or unevenness, re weld the vacuum pump until the requirements are met.

For the wiring of vacuum pump unit, the three wires must be wrapped together with plastic tape to wrap two layers. The first layer is more than 50 mm above the end of each wire insulation layer and the second layer is 50 mm beyond the end of the first layer. Take a basin of cold water and immerse the wrapped thread in water safely. After 12 hours, the insulation shall not be less than 50 megohm with 500V megger. Otherwise, it should be repackaged until the requirements are met.

The grounding wire of the vacuum pump unit must also be wrapped according to the wiring process of the submersible cable; after connecting the vacuum pump unit, the insulation resistance should be continuously measured during drilling to observe the change and prevent the cable wall from damaging the cable insulation layer. When the drop is less than 0.5 megohm, the device must be started to detect the cause.


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Roots Vacuum Pump 

Usage of circulating water vacuum pump

1、 Usage of vacuum pumping: 

The circulating water vacuum pump is used for vacuumizing equipment such as vacuum drying oven, rotary evaporator, double glass reactor, etc., so as to reduce the air pressure in the experimental equipment, so that the tested samples can quickly evaporate at a lower temperature. For example, when used in a vacuum drying oven, the materials can be quickly dried at a lower temperature under the condition of high vacuum, without damaging the effective components of the sample, and No secondary pollution.

The circulating water vacuum pump is also known as the circulating water multi-purpose vacuum pump. As the name implies, in addition to vacuumizing, it should also be used for recycling. However, many units do not use the purpose other than vacuumizing when using the circulating water vacuum pump. For example, in the rotary evaporation experiment, we often use the method of connecting the suction nozzle of the vacuum pump directly to the vacuum air nozzle of the condenser for air extraction, If you feel that the pumping speed is slow, the two taps will be connected in parallel and connected to the rotary steam, which will increase the pumping speed. However, the water in the vacuum pump water tank will become hot because of the large amount of steam pumped. When the temperature rises to more than 40 ℃, the pumping efficiency will be reduced. If we look at the back of the water tank, we may notice that there are two nozzles on the top of the water tank. These two nozzles are for the purpose of To solve the problem that the water temperature in the water tank is too high, connect the water inlet of the water tank with a water pipe and put it into the pool, connect the water nozzle with the water pipe, turn on the faucet, and adjust to the appropriate flow rate, which can not only prevent the water temperature from being too high, but also reduce the radiation of corrosive gas on the circulating water vacuum pump.

2、 Multi purpose usage:

In addition to vacuum pumping and water circulation, circulating water vacuum pump has another purpose, which is to provide cooling water for condenser.

The specific operation method is as follows: connect the water inlet of the condenser of the rotary evaporator or double glass reactor to the water outlet on the back of the vacuum pump with a rubber tube, and then connect the water outlet of the condenser to the water inlet with a rubber tube. After checking that the hose is firmly connected, turn on the power switch of the circulating water vacuum pump, and then turn the knob switch on the back of the vacuum pump to a suitable position to adjust the flow, In this way, one machine can be used for many purposes.


Vacuum Pumps Are Used For Pharmaceutical Packaging

Rotary Vane Vacuum Pump

Dry Scroll Vacuum Pump

What are the principles of rotary vane vacuum pump

The rotary vane vacuum pump is a series connection of the main pump and the former stage pump. The rotary vane vacuum pump selects the rotary vane pump as the front stage pump, so it overcomes the defect of low pumping rate of rotary vane vacuum pump under certain pressure when it is in use, and retains the advantages of roots pump, such as agile operation and relatively large pumping rate.

Because of its compact structure and small floor area, rotary vane vacuum pump can replace multiple mechanical vacuum pumps. Therefore, rotary vane vacuum pump units are widely used in vacuum training, power capacitor, transformer vacuum heat treatment, vacuum coating equipment pre pumping, electric vacuum semiconductors and other occupations, which will not react with pump oil and contain no particulate dust.

Next, I'd like to introduce you to the following introduction, and maybe you can make a profit from it. How does the rotary vane vacuum pump work? Let's learn about it. When the rotary vane vacuum pump in the laboratory is lower than the full steam pressure under the pump temperature, it can be filled with gas and discharged from the pump at any time to avoid condensation in the pump oil. In addition, when the closed pump mouth is working.

The condensate of condensable gas that has been mixed into the oil may be dissolved in the oil in the gas phase, which will overflow from the pump cavity. At this time, if the mission of opening the gas town, a certain amount of condensable substances can be pumped out, and then play a certain pollution effect, extending the operation period of the pump oil.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

Causes of active trip of vacuum pump

This paper analyzes the causes of the active trip of the vacuum pump. Vacuum pump refers to the equipment or equipment that uses mechanical, physical, chemical or physical-chemical methods to extract air from the container to obtain vacuum. In a word, vacuum pump is a kind of equipment to improve, generate and maintain vacuum in a closed space by various methods. If the vacuum pump encounters an active trip condition. 

First of all, we should understand the cause of the trip condition, and then deal with the vacuum pump trip fault, and then clean up the trip problem. The vacuum pump manufacturer explains the cause of the vacuum pump trip for you. The vacuum pump is stopped for a long time. If the vacuum pump is stopped for a long time, the motor load will lead to temporary high current. At the moment, close the air inlet of the vacuum pump to heat the pump body.

Motor load. The current of vacuum pump motor is too high at the moment. If the current exceeds the current set by the electric control box, the vacuum pump will trip and trip automatically. The vacuum pump wholesale prompts that it is the normal phenomenon of the vacuum pump at the moment. The upper limit of current maintenance can be adjusted to deal with the tripping phenomenon. The vacuum pump can be disassembled to check whether there is any internal fault.

The vacuum pump motor is connected to the two-phase power supply. If the three-phase power supply is not enabled, the three-phase power supply of the vacuum pump can be connected. If the operation time is about 10 hours and the tripping and tripping conditions occur, it is still necessary to adjust the upper limit of over-current. The above materials are supplied and shared by horsepower electromechanical manufacturers.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

Operation characteristics of oil-free vacuum pump

The oil-free vacuum pump is the operation cavity of the pump, there is no medium to recover the original gas. There are many other categories of products that are loved by many professions. In the purchase of oil-free vacuum pump time must not be greedy cheap to choose a low price, but should be on-site investigation, to choose a suitable for their own. 

The working principle of oil-free vacuum pump is the same as that of general positive displacement pump. It is composed of stator, rotor, rotating plate, cylinder block, motor and other primary parts. When the rotor rotates at high speed, the four radial sliding blades in the rotor slot will divide the pump chamber into four operating rooms, because of the centrifugal force effect, the vane is close to the cylinder wall.

Separate the inlet and outlet of the stator, operate in a circular manner, change the volume, discharge the inhaled gas from the exhaust port, and then reach the purpose of air extraction. How does the oil vapor discharged from the oil-free vacuum pump affect the environment. If the environment does not allow pollution, can choose oil-free oil-free vacuum pump, perhaps the oil vapor discharged to the outdoor. Correctly combine the oil-free vacuum pump.

Because the oil-free vacuum pump has selective pumping, sometimes one kind of pump can not meet the pumping requirements, and several pumps should be combined to make up for each other to meet the pumping requirements. If the titanium pump has a high pumping speed for hydrogen, but can not pump helium, and the tripolar sputtering ion pump (or bipolar asymmetric cathode sputtering ion pump) has a certain pumping speed for argon, the combination of the two will make the vacuum equipment get better vacuum degree.

Dry Screw Vacuum Pump In Acetone Recovery

Rotary Vane Vacuum Pump

Dry Scroll Vacuum Pump

Oil change operation of vacuum pump unit

Whether it is a vacuum pump unit or any other mechanical equipment, it is inseparable from lubricating oil, because lubricating oil can effectively help the equipment to work better. However, this lubricant cannot maintain its function for a long time. It needs to change the oil according to the use of the device. Because after a long time of work, the oil quality of the unit will be polluted by various external factors, otherwise, if the lubricating oil is replaced in time, the unit will be damaged. 

1. When the vacuum pump is equipped with replacement oil, the pump should be taken out of the vacuum system first.

2. After that, the end of the chassis motor should be raised. Open the oil drain plug to drain the oil. Turn the device to keep the exhaust port, let all dirty oil in the chamber drain out from the oil drain port, and then add new oil from the air inlet. Oil 100-500ml continuous rotation 5-10 rpm or more for internal cleaning, this operation 3-5 times.

3. After taking out the oil, cover the oil plug, put the pump horizontally, add new oil from the air inlet and oil hole, and change the oil.

4. When the vacuum pump is equipped with oil displacement, it is not recommended to start the motor for a long time. At this time, the exhaust valve will be too severe and fatigue.

5. When changing the oil of vacuum pump unit, kerosene, gasoline, alcohol, etc. should not be used for non disassembly cleaning of the pump.

6. If the pump stops for a long time, the exhaust hood should be removed and the exhaust plug should be closed to the air inlet and drained。

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

difference between medical vacuum pump and industrial vacuum pump

Medical vacuum system is an important part of hospital design and construction. Its main application principle is vacuum suction. In the construction of medical vacuum pump system, the choice of medical vacuum pump is different from that of general industrial vacuum pump. These differences mainly involve three aspects. 

First, the vacuum in industrial production tends to be higher, while the vacuum in medical vacuum is lower. Vacuum is widely used in industrial production and has a long span. The vacuum degree of many vacuum applications is usually less than 1 HPA; while the medical vacuum cleaner is mainly used for dust collection, and generally does not need too high vacuum degree, and the absolute pressure is mostly between 13 ~ 60kpa, which is much lower than that of industrial vacuum pump. Therefore, it is necessary to distinguish when choosing medical vacuum pump.

The second point is that the continuity of the vacuum chamber is different. Many vacuum chambers in industrial vacuum applications are used intermittently, which means that the operation of vacuum pump is mostly intermittent; the medical vacuum system is used continuously and simultaneously with different gas points.

Third, the purpose of vacuum is different. Most industrial vacuum pumps pump out the gas in the vacuum chamber to create a vacuum environment for production; The medical vacuum cleaner is mainly used for vacuum cleaning, mainly for extracting various kinds of liquid (of course, the purpose is to extract anesthetic waste gas, etc.) therefore, when selecting the medical vacuum pump, the main concern is how much volume flow the vacuum pump can provide under the design pressure and how much liquid can be sucked out per unit time. This is also different from the choice of industrial vacuum pump. The corresponding pumping speed and inlet pressure and many other factors.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

Repair and maintenance of Roots vacuum pump

Roots vacuum pump is an important part of vacuum pump. How to repair and maintain roots vacuum pump?

It is necessary to check the vacuum pump every day, including the oil level, temperature and motor load of the vacuum pump. Ensure that all indexes are under control. If there is any problem, please solve it in a targeted way.

Check the accessories of Roots vacuum pump every month, including tension of V-belt and coupling elastomer.

Every three months, it is necessary to check whether the lubricating oil in the gear box of Roots vacuum pump remains unchanged and replace the deteriorated oil in time.

In the first half of this year, we mainly inspected the quality of lubricant in the seal ring and bearing housing of Roots vacuum pump. If it fails, it must be replaced.

Every year, the overall inspection of vacuum pump, including bearing inspection, is an important factor in maintaining vacuum pump. This is very important. The piston ring bushing is in good condition. The new ring liner should be replaced with severe wear.

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Rotary Vane Vacuum Pump

Dry Scroll Vacuum Pump

Stainless steel vacuum pump pumping requirements

Stainless steel vacuum pump can be used to pump air to reduce pressure, but what should be pumped? 

Combine the pump correctly. Due to the selective pumping, sometimes a stainless steel vacuum pump can not meet the requirements of air extraction. Several pumps need to be combined to supplement each other to meet the requirements of air extraction. If the titanium sublimation pump has a high pumping speed for hydrogen, but can not pump helium, and the tripolar sputtering ion pump (or bipolar asymmetric cathode sputtering ion pump) has a certain pumping speed for argon, the combination of the two will make the vacuum device get better vacuum degree.

In addition, some stainless steel vacuum pump can not work under atmospheric pressure, need pre vacuum; some stainless steel vacuum pump outlet pressure is lower than atmospheric pressure, need the front stage pump, so all need to combine the pump.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

Advantages of corrosion resistant water ring vacuum pump

Corrosion resistant vacuum pump, in particular, is a kind of water ring vacuum pump with corrosion-resistant materials set on the surface or local parts of parts flowing through the fluid. It is suitable for compression, filtration, concentration, adsorption, cooling, reaction and other process units in chemical, metallurgical, environmental protection, pharmaceutical, paper-making, chemical fertilizer and other industries. 

It has the characteristics of low cost, long life, relatively simple manufacturing process and high cost performance. The utility model integrates the advantages of several existing corrosion-resistant water ring vacuum pumps. According to the different requirements of corrosion resistance of various flow passage parts, according to the principle of equal life and actual process conditions, the utility model adopts different corrosion resistance measures on the substrate made of cast iron, cast steel or carbon steel, so as to greatly improve the acid resistance, alkali resistance and other corrosion resistance properties, especially the service life when pumping corrosive gases It can work reliably within the specified maintenance period under the vacuum degree of 3kpa absolute pressure and water and air brush. The maintenance cycle is 0.5-2 years according to the working conditions of corrosive medium, temperature and pump speed. Under the same working conditions and service life, the cost is at least 1-5 times lower than that of stainless steel.

It can be used repeatedly and economically. When the corrosion-resistant lining layer of the utility model is aged and invalid, it can be repaired simply, economically and effectively. Since the substrate of the parts will not fail, the maintenance can be repeated.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump

Energy saving corrosion resistant vacuum pump

Many of the corrosion-resistant vacuum pumps rely on pressure to work better. Therefore, proper decompression is beneficial. How do we look at the discharge pressure of energy-saving vacuum pumps? 

The exhaust pressure has a great influence on the suction capacity and shaft power consumption of energy-saving vacuum pump. When the energy-saving vacuum pump system is running, if the exhaust pressure is higher, the suction volume will be smaller, and the power consumption of the corresponding shaft will be greater. On the contrary, when the exhaust pressure of the system is smaller, the suction capacity of the energy-saving vacuum pump will be greater, and the power consumption of the corresponding shaft will be smaller.

Therefore, in the actual operation and maintenance of corrosion-resistant vacuum pump, we should pay attention to the real-time observation of the exhaust pressure data of the vacuum pump system. When there is abnormal exhaust pressure data, the corresponding measures should be taken immediately to update and transform the whole vacuum system, so that the exhaust pressure of the vacuum system can be maintained in the national standard or recommended by the manufacturer for a long time, so as to ensure that the energy-saving vacuum pump is always in place Under the optimal working conditions, the overall operation mechanical efficiency of water ring vacuum pump can be effectively improved.

Rotary Vane Vacuum Pump In Industrial Dust Collection

Rotary Vane Vacuum Pump

Dry Scroll Vacuum Pump

How to eliminate noise of vacuum pump

1. If the vacuum pump is in the working state, the vacuum degree indicated by the vacuum meter is about -0.093, it will produce sharp noise (cavitation sound). This is a normal phenomenon, because the vacuum pump itself has a matching cavitation protection pipe to reduce this noise, so as long as the valve is opened, the noise can be reduced. 

2. If the flow rate of working fluid is too large, cavitation noise will also be generated. If the flow rate of working fluid is not the above problem, it is very likely that the intermittent noise caused by friction and impact caused by impurities in the pump body may be caused by the high-speed operation of the impeller. Please repair and maintain it as soon as possible.

3. If the design, manufacture or material are not proper, the vane sliding is not smooth, or the blade head cannot always run close to the cylinder wall due to the existence of exhaust dead gap and incompressible oil, it will cause the impact sound of the vane on the cylinder wall. Therefore, the circular arc structure should be adopted to separate the inlet and exhaust ports. The dead gap is eliminated by the exhaust guide groove.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

Pressure of stainless steel vacuum pump

For the knowledge of stainless steel vacuum pump, I believe you have a certain understanding, in order to have a better use of it, we should understand its calculation method, the following is a brief introduction for you. 

Vacuum degree = atmospheric pressure absolute pressure (atmospheric pressure is generally 101325pa, the ultimate absolute pressure of water ring vacuum pump is 3300pa, and the limit absolute pressure of vane vacuum pump is about 10Pa)

1. Limit relative pressure: the relative pressure is how much lower the measured internal pressure is than the "atmospheric pressure". It shows that the actual value of system pressure is lower than that of atmospheric pressure. As the air inside the container is pumped, the pressure inside is always lower than that outside the container. Therefore, when expressed in terms of relative pressure or gauge pressure, the value must be preceded by a negative sign, indicating that the internal pressure of the container is lower than the external pressure;

2. Limit absolute pressure: the absolute pressure is how much higher the measured internal pressure is than the "theoretical vacuum (theoretical vacuum pressure value is 0Pa)". It compares the absolute vacuum pressure of the theoretical state. Due to the limitation of technology, we can't pump the internal pressure to the absolute vacuum value of 0Pa in any case. Therefore, the vacuum value pumped by stainless steel vacuum pump is higher than the theoretical vacuum value. So when expressed in absolute vacuum, there is no negative sign in front of the value.


CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump

Solution to overload of anticorrosive vacuum pump

As for the anti-corrosion vacuum pump, how much do you know about it, and what measures should be taken for overload when using it? We should have a simple understanding. The following will introduce what measures should be taken for overload of anti-corrosion vacuum pump: 

1. Hydraulic coupling: the use of hydraulic coupling can also prevent the overload of anti-corrosion vacuum pump, so that the pump can work under high pressure difference;

2. Vacuum electrical components are used to control the inlet pressure of anti-corrosion vacuum pump: pressure sensitive elements such as vacuum diaphragm relay or electric contact vacuum pressure gauge are installed at the inlet pipeline of anti-corrosion vacuum pump. After the vacuum system is started, when the pressure at the inlet is lower than the given value, the pressure sensing element will send out a signal to start the anti-corrosion vacuum pump through the electrical control system. If the inlet pressure of the pump is higher than the specified value, the vacuum pump will be shut down automatically to ensure its reliable operation;

3. Mechanical automatic pressure regulating bypass valve: the bypass valve is installed on the bypass pipe between the outlet and inlet of the anti-corrosion vacuum pump. This valve controls the pressure difference between the pump inlet and outlet not to exceed the rated value. When the pressure difference reaches the rated value, the valve will open automatically by the differential pressure, so that the outlet and the inlet are connected, so that the pressure difference between the inlet and outlet is reduced rapidly. At this time, the anti-corrosion vacuum pump works under almost no pressure difference load. When the vacuum pump passes through the rated value, the pump will close automatically when the differential pressure is lower than the rated value. The anti-corrosion vacuum pump with bypass relief valve can be started at the same time with the previous pump, which makes the unit operation simple and convenient.


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Rotary Vane Vacuum Pump Sealed Container

Dry Scroll Vacuum Pump

How to select the required vacuum pump unit

The matching of vacuum pump unit is a strict series of specifications, which must be strictly calculated and designed. Therefore, when choosing the vacuum pump unit, we should consult the vacuum pump manufacturer or the vacuum pump professional. 

At the same time, when selecting the vacuum pump unit, we should inform the vacuum pump unit manufacturer of the practical application status and needs. Let them design supporting facilities according to the actual situation of consumption.

At the same time, we should pay attention to the overall quality of the vacuum pump unit, especially the quality of the vacuum pump. The quality of the vacuum pump often determines the quality level of the vacuum unit. At the same time, the manufacturer of vacuum pump unit will consider whether the auxiliary equipment such as condenser and dust collector can be required on the air inlet pipe of vacuum pump according to the practical application of users.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

Roots vacuum pump pipeline installation

From the operating condition of Roots vacuum pump, the center of key devices mainly focuses on the planning of main equipment and the sealing of pipeline devices. As long as these work can follow the correct steps, the application of water ring pump is a fundamental guarantee. Often in the process of installation and commissioning, the pipeline of this kind of product is also very important, whether its sealing is good or not Tie to the operation of the whole set of equipment, if the device can not be well sealed, it may lead to foreign matters or other reasons to make the pump out of order. 

Therefore, the pipeline connection of Roots vacuum pump is also an important work. When using pipeline materials and various valves, it is necessary to effectively seal the connection points of each pipeline according to the application description, so that it can reach the corresponding range. If there is leakage and other problems, the pipeline should be checked in time to see whether it is the problem of sealing formation and repair it in time The operation condition of water ring pump is stabilized.

It is the biggest assistance for Roots vacuum pump to strengthen the pipeline and the devices at each joint. This is the sign that it can complete stable operation. It is also through these small device work that the utilization of vacuum pump is truly demonstrated. After the smooth operation, it also clarifies the correct device and good sealing, which adds more favorable elements to the consumption process.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

Oil free environmental protection dry screw vacuum pump

Why is the environmental protection problem of oil-free dry screw vacuum pump? Simply speaking, compared with oil vacuum pump, the extracted gas of oil-free dry screw vacuum pump will not be mixed with oil and gas, which can obtain a clean vacuum environment. In addition, if the extracted gas is corrosive to the oil, or contains a large amount of water and other substances that can damage the oil, then the oil vacuum pump cannot be used. As there is oil, the oil in the vacuum pump is usually used for lubrication and sealing. If the oil is corroded or emulsified, the vacuum pump can not work normally. 

Oil free dry screw vacuum pump is one of the essential equipment in the field of vacuum equipment. Power, oil, pharmaceutical, food and other areas closely related to people's life have different market demand for vacuum pump equipment. Under such huge demand, China's vacuum pump enterprises constantly stop the adjustment of industrial structure, so as to meet the needs of various categories At the same time, it can also stop the whole vacuum pump equipment to improve its technology.

After analyzing the current situation of domestic vacuum pump in recent years, it is found that there is no large pump group which can represent the whole vacuum pump industry market. Moreover, while the domestic vacuum pump market demand is expanding day by day, foreign advanced enterprises have numerous factories in China, and relying on their strong technical strength, they share the "share" with domestic vacuum pump enterprises. The promotion of competitiveness makes domestic vacuum pump enterprises pay more and more attention to the technology improvement of their own brand of vacuum pump equipment.

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Dry Scroll Vacuum Pump