COMMON TROUBLESHOOTING METHODS FOR WATER RING VACUUM PUMP

In the chemical production, water ring vacuum pump is used to transport or suck flammable, explosive and corrosive gases. It is efficient and safe. But if the operation is improper in use, there will be some faults occasionally. The following will let us analyze the common failures and solutions of the vacuum pump.vacuum-pump-is-used-in-machinery-industry

Water ring vacuum pump common troubleshooting methods:

1. Overheating of water-ring vacuum pump motor is generally caused by excessive water supply motor overload, lack of phase, exhaust hole plugging, impeller dragging other components. At this time we need to reduce the water supply to the normal range, refer to the use of the pump instructions; check whether the wiring is firm, check the exhaust port, open the pump lid to adjust the clearance between the impeller and other components.rotary-vane-vacuum-pump-sealed-containera

2. can not start or start after the noise is too big, the water ring vacuum pump motor power supply voltage is insufficient, the pump for a long time did not cause corrosion, when the pump inhalation of sundries will happen. Check whether the power supply voltage is too low and whether the electrical wiring is reliable. If the pump has not been used for a long time to cause corrosion can be added a point of rust remover or open the pump cover to artificially remove rust; open the pump cover to remove debris.Common-troubleshooting-methods-for-water-ring-vacuum-pump

Oil Seal Working Principle And Oil Seal Oil Leakage Measurements

I.Working principle of the oil seal:

1. In the free state, the inner diameter of the oil seal lip is smaller than the shaft diameter and has a certain amount of interference.

2. After installation, the interference pressure of the oil seal cutting edge and the contraction force of the self-tightening spring generate a certain radial pressure on the rotating shaft.Vacuum_Part.

3. When working, the oil seal lip forms a sealing contact ring of 0.25 to 0.5 mm wide under the action of radial pressure.

Under the action of the pressure of the lubricating oil, the oil penetrates into the oil seal edge and forms a very thin oil film between the rotating shaft. The oil film is subjected to the surface tension of the oil to form a “new moon” surface on the outer edge of the rotating shaft and the oil seal cutting edge to prevent oil from overflowing and to seal.oil-seal-working-principle-and-oil-seal-oil-leakage-measurements

II.Main factors causing oil seal leakage:

The tight seal of the oil seal is the main cause of oil leakage. When the shaft wears and forms a groove, even if the new oil seal is not sealed, the contact pressure of the oil seal lip and the shaft is lowered, and the interference between the diameter of the oil seal lip and the shaft diameter after installation is too small. The main reasons for analyzing the lack of sealing are:the-maintenance-steps-of-the-vacuum-unit

1.Oil seal manufacturing quality is poor;

2.Poor quality of shafts or bearings;

3.Improper use and maintenance;

4.Improper installation;

5.Improper storage, adversely affected by environmental pollution.

Cleaning Of Water Ring Vacuum Pump

Water ring vacuum pump in the long use of the presence of some stains in its appearance or internal residue, in order to ensure the cleanliness of the equipment, we need to carry out some unscheduled cleaning. Avoid excessive use of vacuum pumps.

The cleaning steps of the water ring vacuum pump:

1. the water ring vacuum pump uses one month to clean the foreign objects gathered in the cavity of the pump, for example, it can open the valve on the drain line for a short time or open the emptying in a short time.

2. if the water ring vacuum pump has excessive accumulation of scale in the work, then the water ring vacuum pump should be washed once every other time (generally 5~10 days), and the washing time is flushed with a suitable solvent (10% oxalic acid, alcohol, etc.) and then rinsed with water.

3. All filters and filters installed on the pipeline must also be cleaned or replaced periodically (once a month).

4. The next cleaning cycle must be determined according to the scaling in the exhaust chamber of the water ring vacuum pump in the first inspection process or the blockage of filter net filter on the pipe.cleaning-of-water-ring-vacuum-pump

5. When the water ring vacuum pump is cleaned with compressed gas, the personal protective equipment (such as the wind mirror, the mask and so on) must be worn and the discharge gas is discharged from the pipe. When using chemical cleaning materials, attention must be paid to warnings and guidance in relevant safety materials. Chemical substances must be compatible with the materials used. It should be noted that chemical substances may corrode parts in the pump.

In the process of cleaning water-ring vacuum pump, it is necessary to choose the suitable cleaning agent, and the cleaning methods of different stains will be different. In ordinary use, we should also pay attention to the cleanliness of the equipment. Too much stains will affect the use of the equipment.
2SK_liquid_ring_vacuum_pump

The Maintenance Steps Of The Vacuum Unit

The vacuum pump unit is widely used now, although the vacuum pump unit is widely used, but many practical vacuum pump customers have ignored the maintenance of the equipment, resulting in a long time, and there are many problems in the equipment. How to maintain and maintain is a very important problem. Let’s learn about the maintenance and maintenance of vacuum pump units.

With the continuous progress of technology in all walks of life, vacuum equipment has been continuously recognized and used by everyone. It is essential for the equipment to do some maintenance work in normal use, so how should it be operated?

The maintenance steps of the vacuum unit:

1, check whether the cooling water is smooth, whether the pump body and pump cover and other parts of the leakage phenomenon.

2, regularly check the lubricating oil quality and oil level of the vacuum unit, find that deterioration and lack of oil are timely replacement and refueling.
3. Often check whether the temperature of each part is normal.

4. Check the fasteners of various parts of the vacuum unit regularly and whether there is any abnormal sound in the pump body.how-about-high-temperature-of-vacuum-pump

5. Check the value of the instrument at any time.

6, when parking, turn off the vacuum system valve of vacuum unit first, then turn off the power supply and turn off the cooling water valve.

7. In winter, cooling water from the pump body must be released after parking.

Only when the daily maintenance work of the vacuum unit is done and the failure probability of the equipment can be reduced can the equipment be made more valuable in the process of use, and the service life of the equipment can be extended while maintaining the good working performance of the equipment, and it will bring us a better profit.hydraulic-system-of-vacuum-pump-unit

A Device For A Water Ring Vacuum Pump

As is known to all, water ring vacuum pump is a common vacuum equipment, which consists of pump shell, impeller, inlet, exhaust pipe and rotating shaft, etc. It is widely used, such as vacuum filtration, vacuum water diversion, vacuum feeding, vacuum evaporation, vacuum concentration, vacuum moisture return and vacuum degassing. As a result of the rapid development of vacuum application technology, water ring pump has been paid much attention in the acquisition of crude vacuum. Because the gas compression in water ring pump is isothermal, so can take out inflammable, explosive gas, and also can take out the dust, water gas.the-internal-structure-of-rotary-vane-pump

Water ring vacuum pump is a kind of crude vacuum pump, and the ultimate vacuum can be obtained from 2000 to 4000Pa, which belongs to low pressure compressor. In order to facilitate your understanding, the following is a device for launching ring vacuum pump equipment.

ROTARY VANE VACUUM PUMP SEALED CONTAINERA

Rotary vane vacuum pump is used to remove the gas in a specific sealed container, so that the container can be confirmed the basic configuration of vacuum. Due to the high growth of modern scientific skills, the application of vacuum pump is widely used in various scientific fields and various enterprises and institutions.
rotary-vane-vacuum-pump-sealed-containera

1. Rotary vane vacuum pump is the basic configuration to obtain vacuum. It can be used independently and can also be used as the front stage pump and pre-pump of various high-vacuum systems.hydraulic-system-of-vacuum-pump-unit

2. The air inlet of rotary vane vacuum pump runs continuously open to the atmosphere, no more than three minutes.

3. Rotary vane vacuum pump is not applicable to remove the gas containing particle dust which is chemically responsive to the pump oil and contains high oxygen content and explosive gas.oil-free-vortex-vacuum-pump

Oil – Free Vortex Vacuum Pump

The vortex disk of the oil – free vortex vacuum pump is one or more involute helices connected one end to a plane to form a vortex disk. A pair of eddy disks composed of a static vortex disk and a moving vortex disk constitute the basic pumping unit of oil – free vortex vacuum pump. Driven by an eccentric shaft, the rotating disk and the rotating disk oscillate in relative motion to form a crescent vacuum chamber with constantly changing volume, so that the gas can be inhaled from the air outlet and discharged from the air outlet, completing the cycle of inhalation, compression and exhaust.oil-free-vortex-vacuum-pump

Features of oil-free vortex vacuum pump:

1. No oil, no friction, no contact, no wear and no particle dust pollution, and a clean vacuum can be obtained.vacuum-pump-is-used-in-machinery-industry

2. Large amount of gas extraction: the pumping volume of the pump with the same diameter is twice as large as that of the single stage, saving energy.

3. High pumping efficiency: with 3-4 pumping units, low pressure difference; The air and vacuum are sealed by type 0 ring, with low leakage.

4. Non-contact, good balance, low torque, low noise and low vibration.

5. The structure is simple and compact. Under the same size, the motion radius is small and the operation is stable.

6. Small size, convenient maintenance and low maintenance cost.

7. Air cooling, no water cooling.rotary-vane-vacuum-pump-sealed-containera

Hydraulic System Of Vacuum Pump Unit

The vacuum pump unit needs to use the hydraulic system. Many users should know about its hydraulic system.hydraulic-system-of-vacuum-pump-unit

The pressure adjustment of the hydraulic system of the vacuum pump unit is improper, causing the heating of the system. The programmable controller introduces the vacuum pump unit, which greatly improves the reliability of the electrical system.a-device-for-a-water-ring-vacuum-pump

At the same time, should observe the pressure and the working condition of each system, for each system working properly rear can normal pumping speed, make the work carried out continuous as possible, the concrete cylinder piston should maintain with maximum running, so as to play its maximum efficiency, and can make the concrete cylinder wear uniform in length direction, if pressure is too high and unstable, high oil temperature rise. When the phenomenon of open crown vibration and difficulty in pumping, it shall not be forced to pump. It was found from the investigation on the use of fine stone concrete pump.how-about-high-temperature-of-vacuum-pump

VACUUM PUMP IS USED IN MACHINERY INDUSTRY

What are the problems with vacuum pumps in the mechanical industry? Please read the following carefully to help you better use the vacuum pump and the vacuum system.The-vacuum-pump-commonly-used-in-the-salt-industry

1. Whether the vibration produced during the operation of the vacuum pump has any influence on the process and environment? If the process is not allowed, the non-vibrating pump should be chosen or anti-vibration measures should be taken. Generally, if the vacuum pump is selected properly, there will be no excessive vibration of the vacuum pump, unless the vacuum pump is selected too small and the vacuum pump works too hard, which will lead to overload of the vacuum pump, heating, and burning of the motor. Check the principle of vibration during the process of using the vacuum pump.vacuum-pump-is-used-in-machinery-industry

How About High Temperature Of Vacuum Pump?

The problem of high temperature of vacuum pump has been bothering the user. How to solve the problem of high temperature of vacuum pump and high temperature of vacuum pump? With these problems in mind, we conducted a study on high temperature of vacuum pump. The following is the research content.a-device-for-a-water-ring-vacuum-pump

Causes of high temperature problems of vacuum pump:

(1) high power and working current of the motor lead to high temperature of the vacuum pump.

(2) the number of fan blades is small, and the amount of wind generated is small.

(3) low fan speed, air pressure and small air volume.how-about-high-temperature-of-vacuum-pump

(4) the bus voltage of the vacuum pump motor is 380V. Due to the uneven voltage drop and load distribution of the cable, the actual added voltage of the motor is only 365V, and the low voltage results in high running current.

(5) the motor is attached with dust and oil, which reduces the heat dissipation capacity and leads to high temperature of the vacuum pump.
Piston_Vacuum_Pump

Composition Of The Vacuum System

There are a wide variety of vacuum device, whatever vacuum device, there is always a pumping system that removes the gas from the vessel to obtain the required vacuum conditions in this vacuum vessel. For example: a vacuum processing vessel, which is connected to a vacuum pump by pipes and valves. When the vacuum pump pumps the vessel, the vessel has a vacuum measuring device, which constitutes the simplest vacuum pumping system. (Figure A).composition-of-the-vacuum-system

The simplest vacuum system (Figure A) can only achieve a vacuum in the low vacuum range in the vessel. When it is necessary to obtain a vacuum in the high vacuum range, it is usually connected a high vacuum pump in this vacuum system shown (Figure A). When a high vacuum pump is connected, the valves is usually added to the inlet port and outlet port of the high vacuum pump so that the high vacuum pump can maintain the vacuum alone.types-and-characteristics-of-vacuum-pumps

 If the high vacuum pump is diffusion pump, in order to prevent a large amount of oil vapor from flowing back into the pumping vessel, the trap is usually added to the inlet of the oil diffusion pump – clod trip (Figure B). According to the requirements, it is also possible to add a dust remover, a vacuum relay gauge head, a vacuum soft connection pipe, a vacuum pump inlet bleed valve, etc. on the pipeline, thus forming a relatively complete high vacuum system.is-the-motor-add-a-inverter-could-be-a-vf-motor

Vacuum Pumps Are Used In The Coal Industry

Coalbed methane is generally adsorbed on the coal seam, which has to go through three production processes: drainage, pressure reduction and gas recovery. The vacuum pump used in coal mine.vacuum-pumps-are-used-in-the-coal-industry

Safety, complete set, automation and high reliability are the basic requirements of coal industry for vacuum pump. Traditionally, give priority to with vacuum pump equipment manufacturers, such as: pre separator, tempering prevention device, gas separator, electric control, sensors, instrumentation, etc is configured by the coal mining enterprises, such not only embodied in specialized degree is low, but also due to the mismatch of the configuration of main equipment efficiency is low, and even may be due to the difference of professionalism, equipment can’t work normally. causes-of-damage-and-repair-of-water-ring-vacuum-pump-shaft

Therefore, equipment integration is the development direction of vacuum equipment in the application of coal industry.application-of-vacuum-pump-in-refrigeration-industry

Types And Characteristics Of Vacuum Pumps

A vacuum is a gas in which the molecular density of a gas is lower than the standard pressure. The degree of vacuum is a measure of the thinness of a gas, and its most direct physical quantity should be the number of molecules per unit volume. But because of the history, the vacuum is usually expressed as the pressure of the gas, and the lower the pressure of the gas is, the higher the vacuum. There are two types of vacuum pumps.types-and-characteristics-of-vacuum-pumps.

(1) rotary vane vacuum pump:

The type 2X rotary vane vacuum pump is a bipolar structure volume vacuum pump, which is rotated at high speed by the rotor with rotary vane installed eccentrically, so that the volume of the pump chamber changes continuously and the pumping function is completed. The pump is equipped with a pneumatic valve. When a small amount of water vapor is contained in the pumped gas, the valve is opened to inject air into the exhaust chamber of the pump. The type 2X vacuum pump can be used as the main pump separately, or as the front stage pump of the booster pump, diffusion pump and molecular pump.vacuum-pumps-are-used-in-oil-mines

THE VACUUM PUMP COMMONLY USED IN THE SALT INDUSTRY

Great changes have taken place in China's salt industry, second only to the United States and the Soviet union in output. In most salt production processes, multi-effect evaporation is adopted to improve the yield, energy saving and consumption by increasing the effective temperature difference, while the first-effect low-pressure steam pressure and temperature are basically stable and the improvement space is limited, so the final effect vacuum degree should be increased as far as possible to achieve the goal.The-vacuum-pump-commonly-used-in-the-salt-industry

So how do you improve the vacuum in salt making? What type of vacuum pump should be selected to meet the needs of the salt production process? This paper gives a detailed solution to this problem:Composition-and-type-of-low-vacuum-unit

ROTARY VANE VACUUM PUMP SPEED

We always hope to improve the geometric pumping speed of the vacuum pump as much as possible without increasing the total size of the rotary vane vacuum pump. It can be seen from the previous calculation that the following ways are available:

1. Decrease b: select the smaller b to obtain the larger K, so as to increase the pumping speed. But if b is chosen too small, it will inevitably increase vibration and noise. So it's actually hard to do.Rotary-vane-vacuum-pump-speed

2. Increase speed (n) : the speed of rotation is greatly increased, which can greatly increase the geometric pumping speed. On the contrary, if the required pumping speed is fixed, the increase of rotating speed will reduce the geometric size of the pump. A direct pump is one example.Composition-and-type-of-low-vacuum-unit

3. Increase the number of spinning plates: although increasing z does not increase the pumping speed in a proportional way as increasing n, it also has unique advantages, that is, when adopting the direct connection structure, the rotating speed has reached a certain high value, and increasing the spinning plates can improve the pumping speed without reducing b value or increasing the maximum linear speed. It can reduce vibration and increase the ultimate vacuum degree.
the-internal-structure-of-rotary-vane-pump

Is The Motor Add A Inverter Could Be A VF Motor?

Indeed, a motor add frequency converter, it is possible to achieve variable frequency operation, but it is not a real variable frequency motor.

1.The influence of inverter on the motor, is mainly on the efficiency and temperature rise of the motor:

The inverter can generate different levels of harmonic voltage and current during operation, so that the motor runs under non-sinusoidal voltage and current. The higher harmonics inside will cause the stator copper loss, rotor copper loss, iron loss and additional loss of the motor. The most notable is the copper loss of the rotor. These losses will cause additional heating of the motor, reduce the efficiency, and reduce the output power. The temperature rise of motor generally increases by 10%-20%.is-the-motor-add-a-inverter-could-be-a-vf-motor

2.The problem of Motor dielectric strength:

The carrier frequency of the inverter is from several to a dozen kilohertz, which makes the stator winding of the motor withstand a high voltage rise rate, it is equivalent to applying a steep shock voltage to the motor, and makes the inter-turn insulation of the motor bear a serious test.the-internal-structure-of-rotary-vane-pump

3.Harmonic electromagnetic noise and vibration:

When the motor is powered by a inverter, the vibration and noise caused by electromagnetic, mechanical, ventilation and other factors will become more complicated. The harmonics contained in the variable frequency power supply interfere with the inherent spatial harmonics of the electromagnetic part of the motor to form various electromagnetic exciting forces, thereby increasing noise. Since the operating frequency range of the motor is wide and the range of the rotational speed is large, the frequencies of various electromagnetic force waves are difficult to avoid the natural vibration frequency of each structural member of the motor.application-of-vacuum-pump-in-refrigeration-industry

Causes Of Damage And Repair Of Water Ring Vacuum Pump Shaft

In the damage of the parts of the water ring vacuum pump, the damage of the shaft occupies a large proportion. Damage to pump shaft includes bending, crack and fracture.

The reason of the pump shaft bending is mostly due to the lack of stiffness of the sleeve, coupled with the large imbalance of the impeller, resulting in deformation during operation. The bending direction and size of the axis can be measured by the following methods:

Flat on the shaft bearing and two supporting points (can be a pump shaft center hole, it can also be a shaft neck) to contour, choose several isometric profile on shaft, the shaft rotating a circle with dial gauge measuring lift respectively four directions (i.e., turn 90 ° measuring once a week) on the radial runout, a record. According to this data, the bending values in four directions can be obtained, and the maximum bending direction and size can be found by the graphical method, so that the straightening can be carried out.causes-of-damage-and-repair-of-water-ring-vacuum-pump-shaft

The fracture and fracture parts of the pump shaft often occur in places where local stress is concentrated, such as the edge of the keyway and the abrupt change of diameter. The cause of damage is often fatigue damage due to vibration.

If the pump shaft appears fatigue crack (soon to break the warning), it should be replaced in time. The temporary remedy is to reweld the crack if it needs to be continued due to the temporary impossibility of replacement due to objective factors. When using the pump shaft after rewelding, always pay attention to the change of the rewelding zone to avoid accidents.

In the use of the single-purpose water ring vacuum pump, the common failure is the breaking of the pump shaft (especially the pump with large air volume). Generally, the fracture surface is perpendicular to the axis line, which is very neat like a knife cutting. The whole section is mostly smooth and metallic luster, while a small part is rough. Obviously, this is the fracture characteristics caused by fatigue failure.
Composition-and-type-of-low-vacuum-unit
The main reason for the fatigue failure is that the pressure of gas in the pump chamber on the pump shaft is caused during the running of the pump shaft, which is also called radial force.

Application Of Vacuum Pump In Refrigeration Industry

The vacuum pump can exhaust and reduce the system pressure to a very low vacuum state is its essential function. The vacuum pumps commonly used in the refrigeration industry are similar to rotary plaiting machines. These deep vacuum pumps are all two-stage rotary vacuum pumps, which can reduce the pressure in the leak-free container to 0.1micron mercury column.

As the refrigerant oil in the system will vaporize slightly and generate pressure, it is not realistic to obtain such high vacuum degree in the field installation system. Although some manufacturers require a vacuum of 250 microns of mercury, most require a conventional vacuum of about 500 microns of mercury.

The two-stage vacuum pump is just a series of two single-stage vacuum pumps. These two-stage vacuum pumps are almost all rotary, because rotary vacuum pumps do not have the same exhaust clearance as piston vacuum pumps, which makes the rotary vacuum pump more volumetric efficiency.application-of-vacuum-pump-in-refrigeration-industry


Double-stage vacuum pump can obtain very high vacuum degree because secondary inlet pressure is very low, from the first level of the vacuum pump discharge of low-pressure air to enter the secondary vacuum pump imports, rather than the atmospheric pressure air directly into the secondary vacuum pump, which makes the first level pump has very little back pressure, and therefore has a higher efficiency. The inlet pressure of the second stage vacuum pump is lower, so the vacuum degree of the mercury column, which is only 0.1 micron, can be obtained. Two-stage vacuum pumps have the best record because they also have a high degree of vacuum when used to remove water and are highly efficient.vacuum-pumps-are-used-in-oil-mines

When there is water in the system, the deep vacuum will cause the water to vaporize into water vapor, which is removed by the vacuum pump and discharged into the atmosphere. But only a small amount of water in this way. With a vacuum pump to exclude a large number of moisture, apparently because water vaporization will produce large amounts of water vapor, if there is one pound of water in the system (about 1 pint), if in temperatures of 70 ° F vaporization can generate 867 cubic feet of water vapor.the-internal-structure-of-rotary-vane-pump

The Application Of Roots Vacuum Pump In Sanitation

The extraction of excrement or sludge turbid water from fecal ponds or sewers in cities is to use fecal pumps or sewage pumps to pump fecal or sludge turbid water into the fecal tanks or sludge tanks. Such absorption method is not very sanitary and convenient, resistance is through the pump shell for fecal sludge discharge. The pump not only have corrosion effect, and cause the difficulty to the maintenance of the pump.

If use the roots vacuum pump suction, the feces or sludge tank to draw certain vacuum degree, feces or wallow in the external pressure, automatic into the jar, and feces or filth is not after vacuum pump but directly from the tank inlet of a rubber tube into the jar. In this way, the operation and maintenance of the equipment are relatively convenient, not only avoiding direct contact with the material being lifted, but also avoiding bad smell.the-application-of-roots-vacuum-pump-in-sanitation

When installing the enabling pump, the following aspects should be noted:

(1) add a set of output shaft and the direct connection of the pump to the right reserved hole of the transmission of the car as the source of power.

(2) after installation, the driving shaft on the pump must be coaxial with the output shaft on the transmission side.

(3) the air inlet of the pump is connected with a daily high pressure rubber hose at the top of the sludge tank. The exhaust port of the pump is appropriately equipped with a muffler according to the situation to reduce noise.

(4) a set of buoy switch should be installed at the opening of the top of the sludge tank to prevent sludge or feces from entering the pump. All the opening of the sludge tank should be connected with a high-pressure rubber hose of different lengths to insert into the sludge or fecal pool.vacuum-pump-used-in-steam-turbine

(5) it takes about 30min to drain sludge with a volume of 4m3 with different dilution degree.

(6) the use of roots pump reduces heavy physical labor, improves working conditions, and plays a beneficial role in protecting environmental health and enhancing people’s physical health.Water-ring-vacuum-pump-is-prone-to-problems-in-application

Effect Of Water Ring Vacuum Pump Speed On Performance

Water ring vacuum pump adopts single-stage single-acting structure, which has the advantages of simple structure, convenient maintenance, reliable operation, high efficiency and energy saving, and can adapt to the bad working conditions such as large displacement and fluctuation of load impact. Vacuum pump is widely used in paper, chemical, petrochemical, light industry, pharmaceutical, food, metallurgy, building materials, stone tools, coal washing, mineral dressing, chemical fertilizer and other industries.effect-of-water-ring-vacuum-pump-speed-on-performance

The performance of water ring vacuum pump is expressed by the following parameters: exhaust pressure, vacuum degree, air volume, shaft power, effective power and efficiency.characteristics-of-rotary-vane-vacuum-pump The factors that influence these properties are: the size of the impeller, eccentricity distance, atmospheric pressure, temperature, water temperature, circumference speed of the impeller, air relative humidity, etc. The circumferential speed of the impeller has a very important influence on the performance of the pump. For a running pump, the effect of circular speed on vacuum pump performance is essentially the effect of rotary speed on pump performance.pplication-of-vacuum-pump-in-concentrator

VACUUM PUMP USED IN STEAM TURBINE

At present, most of the 600MW steam turbines at home and abroad are equipped with water ring vacuum pump and jet air pump. The vacuum extraction system mainly includes the sealing device of the steam turbine, the vacuum pump and the corresponding valves, pipelines and other equipment and components.

The vacuum extraction system of a 600MW steam turbine unit of a power plant is as follows: the main pumping pipe of the steam turbine condenser is connected to the extraction system, and the valve, the ejector and the check valve are connected to the vacuum pump. The gas in the water ring vacuum pump through the first and second pressure braid to raise the pressure, and with some sealing water into the gas water separator.vacuum-pump-used-in-steam-turbine

In the separator, water and gas are separated. Most of the gas is discharged into the atmosphere through the upper exhaust pipe. The water separated by the separator is drawn from the lower pipe and sent to the cooler. After cooling, it is returned to the vacuum pump for recycling.

The vacuum pumping system of the unit is equipped with two 100% water ring vacuum pumps. Two are put into operation at the same time when starting. One is running normally and the other is standby.

Characteristics Of Rotary Vane Vacuum Pump

Rotary vane vacuum pump is a kind of vacuum pump equipment with mandatory oil prohibition. It has solved the problems of oil return and oil injection well, and has been recognized by a large number of users. This rotary vane vacuum pump has the following characteristics.

1. Fully sealed structure:

Type C is the only rotary vane pump in the world that seals the motor in the tank. This structure will completely eliminate the possibility of axial leakage, and almost all rotary vane vacuum pumps in China have oil leakage problems.characteristics-of-rotary-vane-vacuum-pump

2. Air ballast valve with air cushion adjustment:

Air cushion is an effective means to eliminate pump noise, and the structure design of the pump air valve takes into account the function of adjustable air cushion, a set of independent system can adjust air cushion volume. In practical debugging, we clearly feel the importance of this structure to noise reduction.

3. Complete protection function of the pump:

The pump itself is equipped with a discharge valve for stopping the pump. This valve is a differential pressure valve controlled by a solenoid valve, and the electric energy required by the solenoid valve is provided by the generator with the motor. In addition, the pump is also equipped with overload protection switch. Once the pump is stuck or the load is too heavy, the motor current will increase abnormally, and the protection switch will automatically shut off the power. From a usage perspective, this feature is useful.2XZ_direct_drive_rotary_vane_vacuum_pump

4. Wide application range of the pump:

Suitable for power supply system of 50HZ, 60HZ and 380V. The pump discharge steam ability is strong, one reason is that when the gas ballast can still maintain high vacuum degree, the other is high oil temperature, oil temperature in normal work for more than 80 ℃, so high oil temperature and the effective gas town, the steam pump drainage capacity is greatly increased. In particular, the pump can be a halogen – resistant vacuum pump as long as the synthetic oil is selected.

Application Of Vacuum Pump In Concentrator

A machine used to absorb gases under an absolute pressure of less than one atmosphere is called a vacuum pump. The vacuum filter of the concentrator, the large water pump (before starting) all need to use the vacuum pump to extract the air.

A vacuum pump is a compressor that sucks gas out of thin air and drains it into the atmosphere. Generally, the pressure of the gas it absorbs is lower than the atmospheric pressure (the vacuum pump recently made can make the residual pressure in the container be 1 x 10-15 mm silver column), and the gas pressure is slightly higher than the atmospheric pressure.application-of-vacuum-pump-in-concentrator

Vacuum pump also has reciprocating, rotary and so on the distinction, its action principle is the same as above. At present, the vacuum pumps used in the concentrator are wet and dry. The vacuum pump only sucks air out of a certain space (such as the air in a filter) and can pump out 98% of it. The wet air pump sucks the liquid out with the air, leaving only 85 percent of it empty.

In order to keep the water ring of a certain volume and heat out, water must be recycled continuously. In order to supply water to the vacuum pump, a special water tank connected with the discharge pipe is installed. The used water is put into the box with air. In order to avoid the wear on the end face of the blade, there should be no inclusion in circulating water. Otherwise, the wear on the blade will be caused. General wear should not be greater than 0.1 mm.2BE1_series_Liquid_ring_vacuum_pump

VACUUM PUMPS ARE COMMONLY USED IN CHEMICAL PRODUCTION

Some processes in chemical production are often required to be carried out under atmospheric pressure. A vacuum pump is a mechanical device for obtaining absolute pressure below atmospheric pressure. There are many types of vacuum pumps, and the types of vacuum pumps commonly used in chemical plants are introduced as follows.

Water ring vacuum pump:

There is an eccentric impeller in the circular shell and a certain amount of water in the pump. When the rotor rotates, due to the action of centrifugal force, water is thrown to the shell wall to form a water ring. The water ring ACTS as a seal, closing the gap between the blades into many small Chambers of different sizes. The rotor rotates to the right and the sealed chamber expands gradually. The gas is inhaled from the suction port on the right. As the rotor rotates to the left, the volume of the chamber shrinks gradually and the gas is discharged from the left vent.

The vacuum degree formed by water ring vacuum pumpis limited by water temperature and can reach 83.4x103Pa. The pump can also be used as a blower, and the pressure (surface pressure) produced shall not exceed 98.07x103Pa.


The water ring vacuum system is simple, compact, easy to manufacture, easy to maintain, and has a long service life because the rotating part has no mechanical friction.


The water ring vacuum pump is suitable for conveying corrosive or explosive gases. The disadvantage is low efficiency, generally 30~50%.Vacuum-pumps-are-commonly-used-in-chemical-production

Vacuum Unit In Pharmaceutical Equipment

Vacuum units are often used in pharmaceutical processes for vacuum distillation, vacuum crystallization or vacuum drying processes to treat pharmaceutical materials. When the drug materials are relatively viscous (such as paste materials, or when the amount of liquid materials is small), these materials have the common feature of removing the liquid materials mixed in the drug materials, which requires very low pressure, generally in the hundreds of Pascals, dozens of hundred Pascals, or even hundreds of Pascals, can remove these relatively difficult to evaporate liquid materials.vacuum-unit-in-pharmaceutical-equipment

The processes of vacuum evaporation, concentration, distillation, crystallization, drying, extraction, sublimation, vacuum mixing, vacuum reaction, absorption, vacuum filtration and conveying materials in the chemical and pharmaceutical industry are all completed by means of vacuum equipment, and vacuum pumps (sometimes units) are usually water ring, rotary vane vacuum pump rotary piston vacuum pumps. The following is a brief description of the main processes of the Shanghai EVP Vacuum Technology in the pharmaceutical industry: drying, distillation, and degassing.Closed_Cycle_Water_Ring_Vacuum_System

Travaini & EVP Single And Double Stage Liquid Ring Pump Comparison Table

Many customers want to replace the Travaini liquid ring pump with EVP pumps, so this article is mainly to list the replacement of the EVP pump and the travaini pump. (mainly compare with Travaini compact small capacity liquid ring vacuum pump)

1. For the 2BV series, Shanghai EVP also produces a larger version of the single-pole water ring pump to accommodate more pumping conditions, such as 197CFM, 282CFM, 353CFM.travaini-evp-single-and-double-stage-liquid-ring-pump-comparison-table

2. The standard material is cast iron, stainless steel 304 and stainless steel 316 are also optional.

The above comparison table is based on 230V/460V, 60HZ, 3PH Liquid_ring_vacuum_pump

The Application Of Roots Pump In Vacuum Electron Beam Welding Machine

In the vacuum electron beam welding machine, roots pump is often used in the vacuum system as the booster pump for differential pumping. roots pump is a two-rotor volumetric molecular pump. Besides volume action, the working principle of molecular pump is also applied.

Under high pressure, because the average free path of the gas is smaller than the clearance, the gas will return in large quantity, so the vacuum pump cannot work well. In order to make this kind of vacuum pump work normally, the rotary plate-type mechanical pump is generally used as the front vacuum pump.the-application-of-roots-pump-in-vacuum-electron-beam-welding-machine


When the current pressure at the outlet of the pump drops to about 100Pa, the roots pump starts to work, and its maximum pumping rate appears at 1.33pa, at which time the average free path of the gas significantly exceeds the width of the clearance, greatly increasing the flow resistance of the returned gas, and its inlet pressure is directly related to the front vacuum pressure at the outlet.

The roots pump has a high pumping speed of up to 40000L/S within the pressure range of 1.33 * 10-2~1.33Pa, and can rapidly expel the gas suddenly released. The speed of the rotary mechanical pump within this pressure range is already very small, while the oil diffusion pump is just starting to work, so the disconnection between the two pumps in the pumping rate can be solved by the addition of the first-stage rotz vacuum pump, so it is also called the booster pump.ZJP_Roots_Vacuum_Pump

Choose Vacuum Pump According To Metallurgical Gas Volume

A vacuum is a given space with a gas pressure below 101,325pa. In a vacuum, the pressure of the gas, the fineness is generally expressed in natural gas, the smaller the pressure value, the thinner the gas. There are many kinds of industrial vacuum pumps, pump performance test methods need to be tested.choose-vacuum-pump-according-to-metallurgical-gas-volume

For vacuum metallurgical equipment, the gas sources in the pre-extraction and hot-smelting of the cold furnace are as follows:

1. The atmosphere in the pumped space (related to the pumped volume),

2. The gases released during the process (including the gases generated and introduced, which are related to time, depression, pressure and production process),

3. Surface air release exposed in a vacuum (related to the type, surface area, time, temperature and pressure of materials, etc.)molecular-pump-structure-and-schematic-diagram

4. Leakage and infiltration gas (related to leakage rate of system components, welding quality of equipment and static sealing components and structural materials);

5. Volatile gases (related to temperature and pressure) caused by the vapor pressure of materials.

In order to ensure the needs of the metallurgical process, the design of the vacuum system is according to the above the required pumping gas flow, to select the suitable vacuum components, pumps and valves, etc., and put forward reasonable layout scheme according to the extraction process, in order to achieve pumping gas is pumped space, overcome deflated and air leakage, make the vacuum degree necessary for the vacuum chamber have always been able to keep.Oil_Diffusion_Pump

Molecular Pump Structure And Schematic Diagram

The core components of molecular pumps are rotating blades and fixed blades. The speed of rotating blade reaches 1800 ~ 90000rpm, and the speed of blade end reaches hundreds of m/s, which is close to the average speed of molecules. The gas molecules are transported to the exhaust port through the collision with gas molecules. When rotating the rotating blade toward the set at high speed, the probability of the gas molecules moving from the suction side to the exhaust side is A, and the probability of the gas molecules moving from the exhaust side to the suction side is B. When the rotating blade hits the gas molecules, the gas molecules touch the fixed blade and then fly to the next rotating blade again, which is eventually bounced to the exhaust port, making A>B realize the exhaust function.
molecular-pump-structure-and-schematic-diagram

If the blade Angle is large, the exhaust speed is large and the compression ratio is small. When the blade Angle is small, the exhaust velocity is small and the compression ratio is large. The exhaust speed of the molecular pump is basically unaffected by the type of gas. The ultimate pressure of the pump can reach 10-8 Pa, but for light molecules/atoms, the exhaust speed will be reduced.FB_Grease_Lubricated_Hybrid_Molecular_Pump

Correct Selection Of Vacuum Pump In Chemical Industry

In the process of chemical production, can work according to the detailed process of the requested pressure fluctuation and the nature of the suction gas reasonable select vacuum pump, firstly a detailed process required working pressure, negative pressure distillation, distillation and sublimation process request high vacuum degree, low working pressure, negative pressure evaporation, boring, concentration, crystallization, dehydration, decoloring, chemical reaction absorption and walks materials such as vacuum technology request low vacuum degree of work (high pressure). work After the pressure is determined, the vacuum pump can be reasonably selected according to the size of the pump and the nature of the gas.

1. According to the working pressure reached by several vacuum pumps, the applicable scope of various vacuum pumps is listed.

2. Choose different injection vacuum pumps for different gases to be pumped

Water injection vacuum pump

1. Water injection vacuum pump：

This pump is suitable for the working pressure is greater than 25 MMHG (3.3 KPa), suction of gases, especially in the suction setting can be vapour condenses in water (or encounter cold condense gas), with dust, granular medium, its advantage is more outstanding. When the working pressure request is relatively small and the amount of non-condensable gas is large, the combination of steam injection pump and steam injection pump and steam injection vacuum pump should be selected.molecular-pump-structure-and-schematic-diagram

2. Series soda water injection vacuum pump：

The pump pressure can reach 2 MMHG (267 pa), but its portfolio than new high efficiency steam jet vacuum pump, soda, jet vacuum pump, multi-stage steam jet vacuum pump volume small, intermittent consumer right in small and medium-sized enterprises (smes).correct-selection-of-vacuum-pump-in-chemical-industry.

3. New high efficiency steam injection vacuum pump：

The working pressure of this pump can reach 0.5mmhg(65Pa), which is suitable for a process in which a large part of the gas is condensable vapor and the proportion of non-condensable gas is relatively small.

4. Soda water combined injection vacuum pump and multi-stage steam injection vacuum pump：

Two kinds of pump working pressure can be reached within 10 pa, are capable of various suction gas, and their difference is that a combination of soda jet vacuum pump than multi-stage steam jet vacuum pump working steam consumption saving, thriftiness running costs.Molecular-pump-application-energy--saving-lamp-production-technology

MOLECULAR PUMP APPLICATION ENERGY - SAVING LAMP PRODUCTION TECHNOLOGY

The application of molecular pump in the manufacture of energy saving lamp round platoon car instead of roots pump has been proved to be effective by experiments. In this way, it can promote the application of molecular pump in lighting industry, improve production efficiency, reduce energy consumption and manufacturing cost, and guarantee product quality.Molecular-pump-application-energy--saving-lamp-production-technology

Today's rapid economic development has brought huge energy consumption and threats to the living environment of human beings. Increasing efficiency and reducing consumption, energy conservation and emission reduction are urgent global issues for environmental protection. The application of molecular pump, replacing diffusion pump or roots pump on many occasions, has achieved a good effect of energy saving and consumption reduction.

Gas Rate Of Oil Diffusion Pump

The pumping speed of the oil diffusion pump remains unchanged within a wide range of inlet pressure. At this time, the pumping speed of the pump is independent of inlet pressure. However, under low and high inlet pressure, the pumping speed of the pump tends to decrease.gas-rate-of-oil-diffusion-pump

In the low inlet pressure range, with the decrease of pressure, the reverse diffusion of the gas from the front stage through the steam jet increases and the pumping speed decreases. In addition, under low inlet pressure, the steam flow from the boiler releases gas and the pump wall release gas also start to affect the pump pumping speed. When the steam condensate returns, the compressed gas dissolves in the condensate and returns to the boiler together, releasing it as the re-vaporized steam returns to the high vacuum nozzle. This part of gas greatly affects the limit pressure of the pump and reduces the pumping speed. When the total amount of gas released by the diffusion gas and steam flow and the gas released by the pump wall is equal to the gas pumped out by the pump, the pumping speed is close to zero.KT_series_oil_diffusion_pump

Water Ring Vacuum Pump Impeller Assembly

The vacuum pump is made up of: pump cover, pump body, disk, impeller, mechanical seal, motor and other parts. Properly assembling the impeller on the shaft can ensure that the water ring vacuum pump has good volume efficiency and prevent vibration.water-ring-vacuum-pump-impeller-assembly

Vacuum pump impeller center hole there is a screw hole on each side, to be a tool, a middle thick plate drilling, tapping, the size is smaller than the motor shaft, the hole at each end milling a slot, bolt fix the two screw holes on the impeller impeller, with a larger spin top tight motor shaft bolt and rotate this bolt with the motor shaft, impeller will slowly come out. If it’s too tight to get out, you can use a fire – baked impeller to inflate it out of the impeller.roots-vacuum-pump-is-used-in-vacuum-aluminum-plating.

When the impeller is mounted on the shaft, its end face must beat within the allowable range. Cover before and after impeller with axial clearance is small, big face runout will cause the impeller and the front and back cover of eccentric wear, not only to pump heat, increase power consumption, but also will increase the end clearance, increase the compression zone gas through the side clearance leakage, reduce the volumetric efficiency.rotary-vacuum-pump-in-medicine

APPLICATION OF WATER RING VACUUM PUMP IN CANNING MACHINE

The vacuum pumping system consists of a vacuum pump, a pressure stabilizer, a dust collector, and a valve link retainer. The selection of vacuum degree and air volume of vacuum pump is the key to the success of V method appearance. The normal maximum vacuum in consumption is around -66500pa (-500mmhg). The pressure stabilizer is a sealed container, whose function is to stabilize the pressure of the vacuum system, to buffer the influence of the system pressure on the appearance, and to filter dust. Dust removal tank; Sandbox for a long time the recycle and pouring molten iron on the formation of a sandbox screen pack's destroyed easily damaged, the sand is formed in the suction vacuum pump wear and tear, had better be in into the vacuum pump money increase dust catcher, link dust removal tank the last into the vacuum pump, to ensure the using life of vacuum pump.When selecting vacuum pumping system, the capacity of vacuum pump should be confirmed first.Application-of-water-ring-vacuum-pump-in-canning-machine

Consider the following elements:

1. The size and quantity of sand boxes that need to work in a vacuum at the same time;

2. The number of casting types simultaneously cast;

3. Size and shape of casting;

4, close to the film's cast appearance of permeability, it controls through the plastic film on the gap amount of air into the mold, so when pouring, casting coating helps to provide a "auxiliary seal layer".
What-does-vacuum-pump-oil-do

WHAT DOES VACUUM PUMP OIL DO

The general vacuum pump is mechanical vacuum pump, there are reciprocating vacuum pump, mechanical pressure pump, oil seal mechanical pump, slide valve type vacuum pump, slide type vacuum pump. Vacuum pump oil is a special lubricating oil specially prepared according to the performance requirements of mechanical vacuum pump.vacuum-parts/oil

During the operation of the vacuum pump equipment, the rotor slide or slide valve ring slides against the inner wall of the stator. In order to avoid scratches, materials are needed to lubricate the rotor. It can slide, indicating that there is a gap between the stator and rotor. In order to avoid air entry, material is required to seal. When the rotor and stator rub together at high speed, a lot of heat is generated. The above three points are the three basic functions of vacuum pump oil, lubrication, sealing and heat dissipation.What-does-vacuum-pump-oil-do

There is an oil channel in the bearing hole of the vacuum pump, which is connected with the main oil channel of the engine. The first is to set the oil intake hole, to achieve the oil intake control; The second is to set the oil hole on the shaft and sleeve at the same time. During the rotation process, when the two holes are in time for the oil inlet, the oil intake quantity can be controlled. Three is on inlet valve shaft sleeve, on CAM shaft, the shaft a week per rotation, the valve opens once, the control system for the input, into the vacuum pump of the lubricating oil by lower oil return hole to return to the engine oil pool.high-vacuum-usage-vacuum-pump-oil-of-1-L-clean-oil

Roots Vacuum Pump Is Used In Vacuum Aluminum Plating

Roots pump is a kind of rotary varactor vacuum pump, will only be used with backing pump with, in a wider range of pressure pumping speed, greatly to be pumping gas containing dust and water vapor is not sensitive, it is widely used in metallurgy, chemical industry, food, electronic plating, etc.

The production of vacuum aluminized products, whether in Europe or other countries, has increased substantially every year in recent years.

In the United Kingdom and west Germany, the production of vacuum aluminum plating is also developing rapidly. Take the smoke-covered aluminum paper as an example. The British use 100% rolled aluminum boxes nine years ago, but now 70% have been replaced by vacuum aluminized paper, the cost is lower by 3/10. Nearly half of west Germany’s smoke-coated aluminium paper is also made from vacuum coated aluminium paper.roots-vacuum-pump-is-used-in-vacuum-aluminum-plating

The rapid development of vacuum aluminum plating in these countries, in addition to the large market demand for packaging materials, another important reason is that their products of vacuum aluminum plating are of good quality and have a large variety of designs and colors. In order to obtain high quality products and achieve good economic benefits, they have strict requirements on raw materials, good equipment performance and advanced technology.ZJ_Roots_Vacuum_Pump

Classification Of Vacuum Valves

A vacuum valve is a vacuum system element used in a vacuum system to change the direction of the air flow, adjust the size of the air flow, and cut off or connect pipes. The vacuum valve closure is sealed with a rubber seal or metal seal.

The bellows of the bellows globe valve are made of stainless steel, high zinc brass JI80, plastic and other materials. Diaphragm seal may be used for closing globe valves of small bore sizes (calibre below 10 mm). Low and medium vacuum can be used with spherical plug valves.

A vacuum valve is a component of a vacuum system for regulating gas flow and cutting off air flow. With the development of vacuum technology, there are many kinds of valves with different materials, structures and USES.classification-of-vacuum-valves

Classification of vacuum valves:

1. According to the working pressure range, it can be divided into low, high and ultra-high vacuum valves.

2. According to the structural form, it can be divided into baffle valve, flip plate valve, butterfly valve, insert plate valve, needle valve, etc. There are also “two links”, “three links” to classify.

3. According to the transmission mode in the structure, it can be divided into manual, pneumatic, electromagnetic and hydraulic transmission, etc.

4. According to the purpose, it can be divided into globe valve, throttle valve, fine tuning valve < needle valve > and air vent valve, etc.

5. According to the material of valve body, it can be divided into metal valve and glass piston, etc.DDC_JQ_B_series_electro_magnetic_vacuum_gas_valve

Application Of Rotary Vane Vacuum Pump In Central Vacuum Suction System Of Stomatology

In the hospital stomatology department or the teeth cleaning business, rotary vane vacuum pump is widely used, especially single-stage rotary vane pump.application-of-rotary-vane-vacuum-pump-in-central-vacuum-suction-system-of-stomatology

Surgical instruments in those places are not only water-jet, but also spurs or scrapers generate spatters at high speeds or high-frequency vibrations, such as solid calculus, teeth, pulp tissue, and food residue, etc., the liquid mainly contains blood, pus, saliva, and contaminated water mist, and the air is accompanied by bacterial aerosols and dust. If the above substances are not pumped on site, the environment in which the patient and the physician are located will be very harsh. Shanghai EVP Vacuum’s SV series rotary vane vacuum pump solves this problem well, ensuring the doctor’s aseptic operation, reducing cross infection and keeping indoor air fresh.

SV series single-stage rotary vane pump, its ultimate vacuum can reach 200 Pascal (SV-010~SV-025: 150Pa, SV-040~SV-300: 50 Pa, SV-630~SV-750: 10 Pa), can basically meet the vacuum requirements of the dental department. If you want to achieve a higher vacuum, you can use the rotary vane pump with a Roots pump.
CVS_Centre_Vacuum_System

Choice Of Vacuum Pump In Electronic Industry

The vacuum is obtained by means of the vacuum pump. Different types of pump, it has certain working conditions and range, when choosing vacuum pump, it should take full consideration of its characteristics and specifications, and start from the following four conditions of the designed system.choice-of-vacuum-pump-in-electronic-industry

(1) volume (including pipeline) and productivity requirements of the evacuated vacuum container.

(2) required vacuum degree.

(3) types of gases extracted.

(4) in the course of work, the release of the workpiece and the system of the gas olives and leakage.2X_A_Rotary_vane_Vacuum_pump

At present, the basic types of vacuum pumps commonly used in China’s electronics industry are mainly mechanical pumps and oil diffusion pumps (sometimes with condensing Wells). The selection of these two types of vacuum pumps (metal) is briefly described as follows.

The basic principle of the mechanical pump is to use the rotor to compress and expand the working space of the mechanical pump periodically, so as to expel the gas from the container (which flows into the mechanical pump through the conduit).Rotary_Vacuum_Pump