Characteristics of Roots Pump

The compression ratio of Roots pump, or the ratio of intake pressure to outlet pressure, is related to the pressure. Usually its maximum value is close to 100Pa. At higher pressure, the compression ratio of the pump is small, which is due to the increase of the flow conductivity in the sub-clearance with the increase of pressure. In theory, the compression ratio should remain unchanged at a lower pressure, but actually it decreases. The compression ratio at low pressure is lost due to the outgassing and the roughness of the rotor surface. Whenever the rotor faces the high pressure side, the surface of the rotor will absorb the gas, and when the rotor faces the high pressure side, a part of the adsorbed gas will be released. The maximum compression ratio is 44. The compression ratio of the large J pump is higher than that of the small pump, because the clearance of the large pump occupies less space than the volume of the pump. The compression ratio of light gases like nitrogen is 15-20% less than that of air. Compression ratio is a static quantity, which is obtained under the condition of zero flow rate. When measuring, the intake port of the pump is sealed and connected with a pressure gauge, the exhaust port is connected with a rough pump, and the whole system is pumped. Put the gas into the front pipe connecting the Roots pump and the rotary vane pump, measure the pressure P (front pressure) on the side of the outlet of the Roots pump, and measure the pressure P1 at the inlet. The compression ratio is derived from P/P1.

When the Roots pump is used to exhaust at high pressure, considerable heat will be generated, which will cause the expansion of the rotor and possibly damage the pump. In order to avoid overheating, the maximum pressure difference between the intake and exhaust ports of Roots pump is stipulated. The maximum pressure difference is generally 1000Pa, but if it exceeds this value in a short time, the pump will not be damaged. To avoid fever, Roots pump is connected by pressing compression pump or transmission pump. In the common way of compressed exhaust, Roots pump and rotary vane pump are used in series. The rated pumping speed of rotary vane pump is 5 to 10 times lower than that of Roots pump. When pumping from atmospheric pressure, the bypass pipeline bypassing the Roots pump should be opened or the Roots pump should be idled. At this time, all the pumping action is carried out by mechanical pumps until the pressure of the front stage is lower than the recommended differential pressure of the manufacturer, then start the Roots pump and close the bypass valve. Some Roots pumps have this bypass characteristic on the pump body.
Dry Type Oilless Vacuum Pumps

Liquid Ring Vacuum compressor

Diffusion pump

Ideal diffusion pump fluid should be stable, low vapor pressure, low gasification heat, and should be safe to take, use and pour. It should not decompose, absorb gases, and react with surrounding substances. Unfortunately, there is no pump fluid to meet these requirements. Mercury was first used as the only liquid element in the diffusion pump fluid. Mercury has now been replaced by fractionated carbon-grade compounds and synthetic pump fluids in almost all applications. Mercury vapor pressure is high and must be trapped in a cold trap during operation. It is also poisonous. Even so, it is still used in some special applications, such as mass spectrometry, because it does not decompose and dissolve gases, and because its mass spectrometry is easy to identify.


Before concluding the discussion on the subject of mercury as pump fluid, it should be noted that mercury and oil can not be replaced in conventional oil diffusion pumps. Mercury requires a lower degree of depression than oil, and reacts with some structural materials of the oil diffusion pump. Unless a baffle is installed between the liquid nitrogen cold trap and the mercury diffusion pump, the mercury stored in the boiler will be depleted after several days of continuous operation of the liquid nitrogen cooling above the mercury pump.

Most diffusion pumps use various fractionated hydrocarbons, vinegars, polysiloxanes or ethers. It has been proved that none of the pumping fluids can be well applied to all applications. The pumping speed of light oil is higher than that of heavy oil, and the vapor pressure of heavy pump liquid is lower, which is necessary to obtain the required low limit pressure in high-demand applications. Carbon-nitrogen compound oil was the first organic pump fluid to replace mercury. These pumps decompose when heated, thus limiting the ultimate pressure they can obtain. The light fraction of the pump liquid will flow back into the vacuum chamber, while the heavy fraction will accumulate on the pump. A fractionation pump is introduced to make the light fraction evaporate preferentially to the bottom nozzle after condensation, so that it can be pumped out by the front pump. It is possible to degasse the pump oil by keeping the wall of a section of ejector at a high temperature. Combining with the above and other design advances, the diffusion pump of heavy oil made by molecular distillation of selected hydrocarbons can reach 5*10-5Pa (without cold trap), and 5*10-7Pa with liquid nitrogen cold trap.

Piston Vacuum Pump

Oil Diffusion Vacuum Pump

Water Ring Vacuum Pump Development

Water ring vacuum pump is a kind of simple vacuum pump, which uses water as working fluid to achieve the function of sealing and circulating power. The water ring pump has the characteristics of convenient maintenance, isothermal compression of gas, suitable suction and compression of flammable and explosive gases, removal of dust and water vapor, etc.

Water ring vacuum pump has become the most widely used vacuum acquisition equipment in chemical industry, food, pharmaceutical industry, coal mine, light industry, paper making, metallurgy, mining, power generation, food and waste gas recovery and utilization industries, especially in the aviation and aerospace industry simulation test.

At present, the gas volume and power of a single water ring vacuum unit are over 70,000 m3/h and 1700 kW respectively. In recent years, with the development of national demand for vacuum acquisition equipment, water ring vacuum pumps are developing towards large-scale, complete, high vacuum and large pumping capacity. For example, 2BE water ring vacuum pump is used in lost foam casting and V-process casting in foundry industry, which requires a large amount of air extraction. The commonly used type is 2BE1or 2BE3series.

Water-ring vacuum pump has developed into a mature and necessary general mechanical equipment for the development of various industries, but there is little research on the actual energy efficiency of water-ring vacuum pump (including water-ring compressor).

In order to continuously promote the technological progress of water-ring vacuum pump equipment in China, better implement the major national decision-making of energy saving and emission reduction, and promote high-efficiency and energy-saving vacuum pump products, the energy efficiency evaluation and ways of water-ring vacuum pump are studied in detail in our company.

Liquid Ring Vacuum Pump

Roots Vacuum Pump

dry screw vacuum pump operation steps

Dry screw vacuum pump is a kind of suction and exhaust equipment which uses a pair of screw to make synchronous high-speed reverse rotation in the pump shell. It is a renewal product of oil-sealed vacuum pump. It can extract gas containing a large amount of water vapor and a small amount of dust. In domestic pharmaceutical, chemical and semiconductor industries, it is really clean. Enterprises with high empty requirements have been widely used. Then its use procedure is also very strict. Now let's study with Xiaobian.

1. Inspection: Inspection of horizontal and vertical installation of dry screw vacuum pump. Tighten the grounding screw. The motor cable is connected correctly. Whether the motor steering is normal or not, if it is reverse operation, it should be corrected immediately. The intake and exhaust pipes are sealed. The cooling water pipe is connected and leaks. The muffler has been installed. The intake valve has been installed. Prepare and observe whether the direction of the pump is the same as the direction marked on the pump. If not, please correct it immediately. Each time the screw vacuum pump is started, the air pump must be operated for 20-30 minutes, then the liquid of the pump and muffler is discharged until the exhaust port. No liquid discharge, prepare for normal pump operation. Open the cooling water valve.

2. Start-up and operation of screw vacuum pump: open the entrance valve and close the entrance. All completed, no abnormalities, and start the pump. The normal operation of data, pump protection is very important. Because of the special structure of dry pump, its operation and mechanical pump are different from Roots pump at present. In the case of extreme voltage, the current will be relatively large, in general, the power of the motor is twice that of the motor. In the same atmospheric conditions will be very small, but also under normal circumstances, to reach the normal motor left and right amplifier.

3. Stop: Close the intake valve and open the intake valve. Open the exhaust valve, cut off the pump motor power supply, stop. Turn off the cooling water source. Close the intake valve. Close the exhaust valve. Discharge the cooling water in the pump to avoid freezing of the pump body in winter or below 4 C, which causes the pump not to run. Observe the discharge temperature of cooling water.

ZJZSK Roots Liquid Ring Vacuum Pump System

Air ejector liquid ring vacuum pump system

water vapor cryopump

Reasons for Crankshaft Wear of Roots Vacuum Pump System

Roots vacuum pump system has not been heard of by many users, but it plays an important role in noise control. But any substance can not stand the passage of time. Crankshaft wear will occur in a long time. Here is the reason for wear.

1. The elliptical wear of the journal is caused by the uneven distribution of forces acting on the journal along the circumferential direction.

When working, the comprehensive force acting on the connecting rod journal always acts on the inner side of the connecting rod journal, and the direction is outward along the crankshaft radius, resulting in wear and tear on the inner side of the connecting rod journal.

2. Because the oil passage to the connecting rod journal is inclined:

When the crankshaft of Roots vacuum unit rotates, mechanical impurities in lubricating oil accumulate on one side of the connecting rod journal under centrifugal force, which accelerates the wear of the side journal and makes the wear of the connecting rod journal conical.

3. The bending of connecting rod and the non-perpendicularity of the cylinder center line to the crankshaft center line of the unit will cause the non-uniform axial force on the journal and cause the wear deflection.

Roots vacuum pump system refers to the pump with two blade rotors rotating synchronously in opposite directions. Its wear is generally related to connecting rods and journals. We need regular maintenance. In addition, we try our best to avoid the phenomenon of wear and tear, so that it is possible to reduce wear and increase service life.

CVS Centre Vacuum System

JZJA(P)LG Screw pump system

Axle-holding problem of water ring vacuum pump

The water ring vacuum pump is suitable for the use of mines with small drainage volume and high negative pressure. Many problems will occur under the condition of long-term non-rest work. Among them, the special one is the axle-holding. Here we introduce the axle-holding problem of the equipment.

1. The problem of holding axle of water ring vacuum pump is mainly based on bearing assembly. The reasons are as follows:

2. The quality of lubricating oil is also related to the occurrence of this situation. If the overall vibration of the pump is too large, it is also the cause.

3. There are differences in the quality of bearings, or wear and aging caused by long-term operation.

4. In the process of assembling, the requirements of bearing positioning and design are quite different, the positioning is inaccurate, and the selection of components is unreasonable.

Above is the reason why the water ring vacuum pump holds the axle. From this we can know that the reason is the quality difference and the wear and tear aging caused by long-term work without rest. It is very important for the equipment to stop and rest. We all need to rest, not to mention the machine. Regular rest is conducive to better operation of the equipment.

JZJ2B Roots-Liquid Ring Pump System

JZPS Roots-Liquid ring Vacuum system

Vacuum pump for steaming frame

The main purpose of steaming machine is to combine the continuous yarn with weaving conditions and to set it after twisting, that is, to stabilize the twist at a certain pressure and temperature, and to obtain a balanced and unbroken yarn. The use process of the yarn steaming machine is vacuum-preheating-humidifying-holding-constant temperature-vacuum cooling-ending. The vacuum pump used for vacuum extraction is generally water-ring vacuum pump. The working pressure of the yarn steaming machine is -0.085-0.1MPA. The water-ring vacuum pump can extract a certain amount of condensable gas.

The steaming machine with vacuum pump can steaming yarn or fabric evenly, accurately and gently from low temperature to high temperature. The steaming process is controlled by a micro-computer, and the temperature is controlled accurately to (+0.5). This ensures that the steaming process can be accurately reproduced according to the budgeted process, avoids the generation of condensation water to the maximum extent, and makes the yarn uniform. Soft steaming treatment. Therefore, in this process can be used, the specific use of water-ring vacuum pump, according to the size of the steamer, as well as their own time requirements to choose the appropriate vacuum pump.

JZP2H type Roots and piston Vacuum system

JZPX series roots-rotary pump system

Reciprocating Pump in Chemical Plant

Vacuum pump is a machine used to pump air from equipment or production system to make equipment or production system work in vacuum. The main working performance parameters of vacuum pump are: pumping rate, limit vacuum degree, shaft power and rotational speed. The pumping rate of vacuum pump refers to the volume of gas that can be pumped out per unit time (m 3/h). Limit vacuum is the highest vacuum that a pump can achieve.

Vacuum pumps commonly used in chemical production include reciprocating vacuum pumps, water ring vacuum pumps and jet pumps. The structure of reciprocating vacuum pump is basically the same as that of piston compressor.

Vacuum pump is characterized by high pressure ratio. For example, to achieve 95% vacuum, the absolute pressure of nominal inspiration is 0.005 MPa, while the exhaust pressure is 0.1 Mpa, with a pressure ratio of 20. Because of the high pressure ratio, the volume occupied by the residual gap volume after expansion is very large, which greatly reduces the suction capacity and the effective utilization rate of the cylinder is very low.

In order to solve the above problems, several grooves are usually opened on the cylinder wall at both ends of the cylinder, which are thicker than the piston. When the piston runs to the stop point, the grooves are used to balance the pressure of the cylinders on both sides of the piston. For example, when the piston runs to the left stop point, the exhaust of the left cylinder ends, the residual pressure in the clearance volume is higher, the suction in the right cylinder ends, and the pressure is lower. Because of the connection of grooves, the gas pressure in the clearance volume of the left cylinder decreases accordingly. In this way, the volume occupied by the expansion of residual gas is greatly reduced and the suction capacity is increased during the piston return operation. The piston runs to the right stop.

Reciprocating vacuum pump is suitable for pumping non-solid particles, non-corrosive gas. This kind of vacuum pump is widely used in chemical industry because of its high pumping rate and high vacuum degree.

Open Cycle Water Ring Vacuum System

Closed Cycle Water Ring Vacuum System

Water Ring Vacuum Pump in Mine

How to Make Vacuum Drainage by Water Ring Vacuum Pump in Mine

Water-ring vacuum pump system is usually composed of vacuum pump, coupling, gas-water separator and pipeline. The water ring vacuum pump uses the rotating impeller to make the water or other working liquid form a rotating liquid ring. The suction gas is compressed and discharged through the liquid ring to obtain the vacuum.

A water ring vacuum pump is used to extract the gas from the suction pipe in order to form a vacuum in the sealed suction pipe and pump body, and generate negative pressure. Depending on atmospheric pressure, water is sucked from the suction pipe and pumped into the pump body. The direction of water injection is from bottom to top. With this water injection method, the vacuum in the suction pipe and pump body is stable, and the water is pressed into the suction pipe and pump body by atmospheric pressure, which overcomes the self-weight of water in the suction pipe and meets the vacuum requirement of the main drainage pump when draining water.

2BE Series Compressors

air-cooled roots-liquid ring vacuum system

Operating Regulations for Centrifugal Pumps

The correct operation of equipment is not only related to the fluency of operation, but also plays a decisive role in the service life of the equipment itself. Familiarity with the operation of equipment is what every relevant worker needs to do. The following three parts are introduced separately: start, run and stop of the equipment:

Pump start-up

A. Before operation, check the flexibility of pump rotation.

B. Close the pump outlet valve;

C. Check whether the diversion water is normal.

D. Connect the power supply and gradually open the pump outlet valve when the motor reaches the rated speed.

Operation of Pump

A. During the operation of the pump, the pressure gauge readings, the vibration and murmur of the pump are often observed, and the leakage of the filler is observed to exceed the standard.

B. The difference between the maximum bearing temperature and the ambient temperature should not exceed 80 C.

C. The optimum quantity of lubricant filling is 1/3-1/2 of the bearing body space.

D. Pay attention to the motor current, temperature and other parameters within the specified range.

Stop it

Attention should be paid to the closure of outlet valve and power switch.

Normal operation of centrifugal pump is very important in production. During the operation of equipment, attention should be paid to observation, problems should be solved in time, and daily maintenance of centrifugal pump is equally important. This can effectively improve the operation efficiency of equipment and reduce losses.

CL Sereis Cone Liquid Ring Vacuum Pump

AT/TC Series Cone Two Stage Water Ring Vacuum Pump

Liquid Ring Vacuum Pump Corrosion Repair

After using liquid ring vacuum pump for a period of time, if the maintenance is not in place, it is easy to cause corrosion, which can be divided into two categories: overall corrosion and local corrosion. The former occurs more evenly on all surfaces of the equipment, while the latter occurs only locally. For example, pitting corrosion, crevice corrosion, intergranular corrosion, stress corrosion cracking, corrosion fatigue, hydrogen corrosion cracking, wear corrosion, delamination corrosion and so on. After serious corrosion, the working efficiency of the equipment is reduced and even needs to be replaced. Enterprises invest heavily. Corrosion repair is the key to solve this kind of problem.

Repair steps:

(1) Surface treatment: thoroughly remove the oxide layer on the surface, and clean the surface with acetone.

(2) Harmonizing material: Harmonize strictly according to the proportion, and mix evenly until there is no color difference.

(3) Daubing material: first, apply a thin layer of material, to ensure that the bonding and full coverage, and then evenly apply the material to the repair surface, to meet the required repair thickness can be.

(4) Curing: 24 hours/24 C (material temperature). The curing time can be reduced by half for every 11 C increase in material temperature, but the increase temperature should not exceed the material's withstanding temperature.

(5) Installation and precautions: Installation should be carried out according to assembly requirements. Repair and protection materials should avoid being knocked or impacted by external forces. If materials affect assembly, grinding method can be used to deal with them. Never knock, so as to avoid damaging other materials.

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

2SK Liquid Ring Vacuum Pump

SY/2SY Series Compressor

liquid ring vacuum pump continuous pumping principle

With the continuous application of vacuum technology, liquid ring vacuum pump has been paid attention to, especially in industrial production. Everyone who has used this equipment knows that it has the characteristics of continuous pumping, so how can this be achieved?

The impeller is eccentrically installed in the pump body. When the impeller rotates, the water entering the liquid ring vacuum pump body is thrown around by the impeller. Because of the centrifugal force, the water forms a closed water ring with the same thickness as the shape of the pump chamber. The upper inner surface of the water ring is just tangent to the hub of the impeller, and the lower inner surface of the water ring is in contact with the top of the blade. At this time, a one-month conodont space is formed between the hub and the water ring of the impeller, which is divided into several small cavities equal to the number of blades by the impeller. If the starting point is 0 degrees above the impeller, the volume of the small chamber gradually increases from small to large and the pressure decreases continuously when the impeller rotates 180 degrees before rotation, and is connected with the suction port on the suction and exhaust disc. When the pressure in the small chamber space is lower than the pressure in the sucked container, the sucked gas is continuously pumped according to the principle of gas pressure balance. It was pumped into a small cavity and was in the process of inhalation. When the suction is completed, it is isolated from the suction port. From section II-II to section III-III, the volume of the small chamber is gradually decreasing, and the pressure is constantly increasing. At this time, it is in the process of compression. When the compressed gas reaches the exhaust pressure ahead of time, it is exhausted from the auxiliary exhaust valve ahead of time. From section III-III to I-I, the volume of the small chamber connected with the exhaust port further reduces the pressure and further increases. When the pressure of the gas is greater than the exhaust pressure, the compressed gas is discharged from the exhaust port. During the continuous operation of the pump, the process of suction, compression and exhaust is continuously carried out, thus achieving continuity. The purpose of aspiration.

Liquid Ring compressor

Dry Vacuum Pumps

2BV Water Ring Vacuum Pump Working Principle

The working principle of 2BV water ring vacuum pump must be understood by every relevant worker, because it relates to the operator's understanding of the equipment and operation proficiency, and indirectly affects the working efficiency. Therefore, the following edition summarizes its working principle for you, and looks at it with the illustration.

The impeller is eccentrically installed in the pump body and injects a certain height of water into the pump when starting. Therefore, when the impeller rotates, water forms a rotating water ring 1 on the inner wall of the pump body under the action of centrifugal force. The inner surface of the water ring is tangent to the hub and rotates along the arrow direction. During the first half-turn, the inner surface of the water ring of the 2BV water ring vacuum pump is measured. The surface gradually separates from the hub, so a closed space is formed between the impeller blades and the water ring. As the impeller rotates, the space expands gradually, the space gas pressure decreases, and the gas is absorbed from the disk suction port. In the latter half-turn process, the inner surface of the water ring gradually approaches the hub, the space between the blades gradually reduces, and the space gas is absorbed. When the pressure is higher than the exhaust pressure, the gas between the blades is discharged from the disc exhaust port. In this way, whenever the impeller rotates - one week, the space between the blades sucks and exhausts once. Many spaces work continuously, and the equipment continuously sucks or presses gas.

Looking at the working principle of the above 2BV water ring vacuum pump, we found that in the working process of the pump, the working water ring heating, while part of the water and gas are discharged together, so we must constantly supply water to the pump to meet the working requirements of the pump. Hope to fully understand the internal structure of the equipment after the principle, can give you some help in future work.

2BV series Liquid ring vacuum pump

DLV Series Double Stages Water Ring Vacuum Pumps

Effect of Water Temperature on Performance of Liquid Ring Vacuum Pump

Today, I would like to share with you the effect of water temperature on the performance of liquid ring vacuum pumps. Many people may not have heard much about it and know little about it. So let's talk to Xiaobian to get more knowledge.

The absolute pressure in the pump chamber of liquid ring vacuum pump is the sum of gas partial pressure and saturated vapor pressure. Assuming that the relative humidity in the pump chamber is 100%, the higher the water temperature, the higher the saturated vapor pressure and the higher the absolute pressure in the corresponding pump chamber, the lower the vacuum pumped by the pump. That's why high water temperatures reduce vacuum. The limit vacuum degree of the liquid ring vacuum pump is basically equal to the saturated vapor pressure of the corresponding water temperature.

2BE1 Series Liquid Ring Vacuum Pump

2BE3 Series Liquid Ring Vacuum Pump

Hydraulic system of liquid ring vacuum pump

Hydraulic system is needed for liquid ring vacuum pump. We should know about its hydraulic system. Here we have a brief understanding of the hydraulic system of liquid ring vacuum pump.

The improper pressure adjustment of the hydraulic system of the liquid ring vacuum pump results in the heating of the system. The hydraulic system is generally a high pressure and large flow system. The programmable controller introduces Roots vacuum pump, which greatly improves the reliability of electrical system. At the same time, we should observe the pressure and the working conditions of each system, and pump the concrete cylinder at normal speed after the normal operation of each system. The piston of the concrete cylinder should keep running at the maximum stroke so as to give full play to the maximum efficiency of Roots vacuum pump and make the wear of the concrete cylinder even in the long direction. If the pressure is too high and unstable, the oil temperature rises. When the open crown vibration of the conveyor pipe and the difficulty of pumping are encountered, the forced pumping shall not be allowed, and the causes shall be immediately ascertained and eliminated. From the investigation of the use of fine stone concrete pumps,

For many types of liquid ring vacuum pumps, the temperature of the hydraulic system can be as high as 60E after 40 minutes of use. After about 2 hours of use, the thermal equilibrium temperature of the hydraulic system can be as high as 70e, while the normal thermal equilibrium temperature of the hydraulic system should be about 50e. Therefore, the problem of high oil temperature in hydraulic system, i. e. heating, has arisen. In hydraulic system, due to performance requirements, safety valve, relief valve and sequential valve are often installed in the system. If the pressure of the safety valve is too low, the safety valve will be opened frequently, resulting in overflow loss and system heating; if the pressure is too high, it will increase the leakage in the system and make the system heating. Therefore, according to the load requirements of the hydraulic system, the safety valve and pressure value should be calculated and adjusted correctly, so as to ensure the system regulation. Work under pressure. You can first hit the conveyor pipe with a mallet to get the elbow.

For the hydraulic system of the liquid ring vacuum pump, I believe that after you know about it, it will be more beneficial to us in the future. I hope that the above knowledge will help you.

Liquid Ring Vacuum compressor

Water ring vacuum pump

VACUUM FURNACE

System parameters of vacuum pump

1. Steam allowance of vacuum pump:

The allowable unit of vapor is kg/h. It refers to the quality flow rate of vapor that can be extracted by gas-ballast pumps in successive operations under abnormal conditions.

2. Vacuum pump pumping rate:

The unit of pumping rate is m3/s or l/s. It refers to the ratio of the flow rate of gas flowing through the test cover to the misaligned pressure measured at the designated position of the test cover when the pump is equipped with a standard trial cover and operates according to the specified conditions. Pump pumping speed for short.

3. Limit pressure of vacuum pump:

The ultimate pressure unit of the pump is Pa, which means that the pump is equipped with a standard trial cover at the outlet and operates according to the standard conditions. Without introducing abnormal gas operation, the trend of the most stable industrial pressure.

4. Reflux rate of vacuum pump:

The unit of reflux rate of the pump is g/cm2.s. It refers to the quality flow rate of the pump flow per unit area of the pump outlet when the pump operates in accordance with the regulations and conditions.

5. Pumping speed coefficient of vacuum pump:

Ratio of theoretical pumping speed to practical pumping speed at pump outlet based on molecular sluice.

CVS Centre Vacuum System

JZJA(P)LG Screw pump system

Notices for Selection of Roots Liquid Ring Vacuum Pump System

Understand the composition of the extracted gas, the gas contains no condensable vapor, particle dust, corrosion and so on. When choosing a vacuum pump, it is necessary to know the gas composition and select the appropriate pump for the pumped gas. If the gas contains vapor, particles, and corrosive gases, it should be considered to install auxiliary equipment such as condenser, dust collector in the intake pipeline of the pump.

The working pressure of Roots vacuum unit should meet the requirement of vacuum equipment's limit vacuum and working pressure. Such as: a vacuum drying process requires 10 mmHg (absolute pressure) working pressure, the limit pressure of the selected vacuum pump should be at least 2 mmHg, preferably less than 1 mmHg. Usually the limit pressure of the pump is half to one order of magnitude higher than the working pressure of the vacuum equipment.

Correctly select the working point of Roots vacuum unit. The normal working range of Roots vacuum unit is from maximum suction pressure to limit pressure *5. Example: The normal working range of JZJ2B150-2.1 Roots water ring vacuum unit is 6000Pa~125Pa. The working range is the normal working pressure range after the main pump is opened. The unit has the best efficiency in this working range.

Under its working pressure, the vacuum unit should be able to discharge all the gas produced in the process of vacuum equipment.

JZJ2B Roots-Liquid Ring Pump System

JZPS Roots-Liquid ring Vacuum system

Starting Mode of Water Ring Vacuum Pump

After long-term shutdown, the water-ring vacuum pump must rotate the coupling by hand for ten days before starting, so as to confirm whether the water-ring vacuum pump shuts off the cut-off valve on the intake manifold of the pump, and what is the proper way to start it?

Turn off the cut-off valve on the intake manifold of vacuum pump; If the exhaust pipe of the gas-water separator is equipped with the cut-off valve, it should also be turned off; The cut-off valve of the water supply pipeline that opens the omni-directional gas-water separator power supply pipeline leaks water to the height-width ratio of the overflow water pipe to the separation equipment; When the water of the gas-water separator reaches the level of the overflow water pipe gauge requiring the height-width ratio Start the motor when facing.


Open the shut-off valve on the exhaust pipe of the separating equipment, adjust the water flow from the separating equipment to underwater concrete by ball valve, so as to minimize the rated power consumption of the motor within the required technical range, and adjust the shut-off valve for feeding water to the separating equipment, so as to minimize the water flow consumption and ensure the technical standards stipulated by the pump.

Adjust the flow of water to the packing box, so as to ensure the sealing of the packing box by using at least the water flow consumption. When a mechanical pump is in extreme operation, it produces burst sound because of the physical effect in the pump, but the power consumption of the output does not increase as a result. When the burst sound occurs with the increase of the output power consumption, the parking inspection should be given when the pump works abnormally.

JZP2H type Roots and piston Vacuum system

JZPX series roots-rotary pump system

Why does the liquid ring vacuum pump system need to replenish water

Supplementary water for liquid ring vacuum pump system can effectively work on gas and improve efficiency. Supplementary water should enter at the end of liquid work on gas, that is, at the highest point of the compression chamber, so that the unit can get sufficient energy and start again when the next cycle turns.

Advantages of replenishing water in liquid ring vacuum pump system:

1. The loss caused by the exhaust hole of the supplementary liquid ring flowing out with the gas flow;

2. End clearance between sealing pump body and impeller;

3. Compressed heat generated by discharging compressed gas;

4. Cooling and lubricating fillers, packing glands and other spare parts.

For example, the liquid ring vacuum pump system has more supplementary water, and excessive water takes up part of the gas space, which reduces the gas volume and exhaust pressure. Too much water will increase power consumption and reduce efficiency, resulting in noise and vibration. The liquid ring vacuum pump system works unsteadily and periodically sprays a large amount of water from the exhaust holes.

If the liquid ring vacuum pump system has less supplementary water, the compressed heat in the liquid ring vacuum pump system can not be fully discharged, so that the temperature of the water ring and the upper gas rises and the gas volume and vacuum degree decreases; the loss of the water ring can not be supplemented, which not only further reduces the performance, but also stops working because the water ring can not be formed.

In order to improve the working efficiency of the liquid ring vacuum pump system, the water supply should be appropriate, not too much or too little, so as to ensure the good operation of the equipment.

Open Cycle Water Ring Vacuum System

Closed Cycle Water Ring Vacuum System

liquid ring vacuum pump system Operation

1. Check whether the valves in the vacuum system are in the prescribed opening or closing state to check whether the system is leaking.

2. Check whether the amount of water in the cavity of the liquid ring vacuum pump exceeds the starting requirement of the water ring pump. Before starting the pump, the intake valve must be opened first. No water in the pump chamber is allowed to start, so as to avoid the leakage caused by dry grinding of the seal.

3. Check whether the waterway and circuit are well connected. Whether the waterway is smooth and the water pressure meets the required requirements; when connecting the circuit, the steering of each vacuum pump must be required to meet the required requirements. (start-up test run without load)

4. Point the working button of the liquid ring vacuum pump, turn to meet the requirements, start the liquid ring vacuum pump and open it immediately.

Water ring pump intake valve, adjust the water volume.

5. Avoid liquid ring vacuum pump inhaling gas or water with particles, avoid wearing impeller, pump body or blocking impeller.

6. The bearings of the motor of the liquid ring vacuum pump should be filled with oil 1-2 times a year, and the bearings should be cleaned at least once a year, and all the lubricants should be replaced.

7. When leakage occurs in mechanical seals used in liquid ring vacuum pumps, it is necessary to check whether the dynamic and static rings of mechanical seals have been damaged or whether the sealing rings have been aged. If the above situation occurs, new parts need to be replaced.

8. Pumps that have been shut down for a long time must be rotated several times by hand before starting to verify that there is no jamming or other damage in the liquid ring vacuum pump.

2BE Series Compressors

air-cooled roots-liquid ring vacuum system

Energy saving measures of liquid ring vacuum pump

The energy saving of liquid ring vacuum pump has always been a concern of the society and users. In the production process, some methods make it consume more energy. In order to achieve the purpose of energy saving, we have taken the following energy saving measures.

1. Expanding the outlet pipe diameter. Replacing 4-meter-long 10-centimeter effluent hose with 15-centimeter hose saves 0.5 kg of diesel oil in 10 hours.

2. Vacuum pump inclined to reduce elbows. The water ring vacuum pump is inclined or the volute is turned so that the outlet is in the pool.

3. Shorten the pipeline. Remove 1 meter steel pipe, 10 hours can save 0.21 kg of diesel oil.

4. In the case of keeping clean, the filter can be removed.

5. Eliminate pipe blockage in time. If foreign bodies are left in the inlet pipe, impeller or guide shell channel, the water output will be reduced.

6. Change the outlet ring of the feed ring vacuum pump and adjust the axial clearance. To avoid improper impeller opening ring and axial clearance of liquid ring vacuum pump, adjustments should be made according to the manufacturer's instructions when using the vacuum pump.

Energy conservation and environmental protection are imperative. Everyone should make some contribution to our ecological environment. Starting from every detail, we should strive to save and avoid waste.

CL Sereis Cone Liquid Ring Vacuum Pump

AT/TC Series Cone Two Stage Water Ring Vacuum Pump

Sealing Form of Liquid Ring Vacuum Pump

In order to let you better use the liquid ring vacuum pump, today's edition for you to sort out some information about its sealing form, let's take a look at it together!

1. Packing seal is to put the compressive and resilient packing into the packing box of liquid ring vacuum pump, which can be sealed by transforming the axial compressive force of the cover into the radial sealing force.

2. Oil seal is a self-tightening lip seal. It has simple structure, small size, low cost, convenient maintenance and small resistance torque. It can not only prevent medium leakage, but also prevent external dust and other harmful substances from entering the liquid ring vacuum pump.

3. The labyrinth seal of the liquid ring vacuum pump works well when the design is reasonable, the processing is fine, the assembly is intact and the rotating speed is high.

4. Power seal. When the vacuum pump is in operation, the pressure head produced by the auxiliary impeller balances the high-pressure liquid at the outlet of the main impeller, thus realizing seal.

2SK Liquid Ring Vacuum Pump

SY/2SY Series Compressor