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