Application of vacuum pump unit

When a vacuum pump can not meet the requirements of pumping and vacuum, several pumps need to be combined to complement each other to meet the process requirements. The combined vacuum pump is called vacuum pump unit. The vacuum pump unit can make the vacuum system obtain better vacuum degree and exhaust volume, and the vacuum pump unit with high adaptability can make the working condition application obtain high application efficiency. Therefore, we should select the vacuum pump unit correctly.

The application of vacuum pump unit needs to make corresponding preparations, such as the selection and assembly of vacuum pump unit.

The vacuum pump unit shall be selected and applied according to the medium conditions, environmental requirements and working condition specifications of the application project. When extracting the gas, it is necessary to know the composition of the gas and the composition of the extracted gas. The gas contains no condensable steam, whether there is particle dust, whether there is corrosiveness, etc. Select the appropriate pump for the extracted gas. If the gas contains steam, particles and corrosive gas, auxiliary equipment, such as condenser, dust remover, etc., shall be installed on the air inlet pipeline of vacuum pump unit.

When the vacuum pump unit with oil seal vacuum pump is applied, it is necessary to determine whether the vacuum system has requirements for oil pollution. If the equipment is strictly required to be oil-free, various oil pumps should be selected, such as: water ring vacuum pump, low temperature pump, etc. In addition, the impact on environmental pollution should be considered. If the environment is not allowed to be polluted, the oil-free vacuum pump should be selected, or the oil vapor should be discharged to the outdoor. If the requirements are not strict, oil pump can be selected, and some anti oil pollution measures, such as adding cold well, oil trap, baffle, etc., can also meet the requirements of clean vacuum.

Water Ring Vacuum Pump manufacturers

What is water ring vacuum pump

Liquid Ring Vacuum compressor

Performance curve of water ring vacuum pump

Vacuum pump unit is a form of using multiple pumps in groups. For such a vacuum pump unit, its performance curve will be more changed with the previous single water ring vacuum pump, so it has a clear understanding.

The typical engine cooling water pump of water ring vacuum pump is a special application of single-stage centrifugal pump in automobile, which has simple type and complex structure. Because the space size of the engine cooling water pump is seriously limited, the water ring vacuum pump and the operating environment are bad, resulting in its low efficiency and serious cavitation damage. Therefore, it is very important to study the relationship between the efficiency and the structural parameters of the engine cooling water pump, and to explore the key factors that restrict the development of the engine cooling water pump.

As an important part of engine water cooling system, the applicability and reliability of engine cooling water pump are paid more and more attention by the design, manufacture and users. Especially with the continuous quality of the engine, the poor working environment of the engine cooling water pump makes the reliability and cavitation damage of the pump especially prominent, which seriously affects the safe, stable and reliable operation of the cooling system. It is of great significance for the development of engine cooling system to discuss how to improve the reliability of engine cooling water pump and study the cavitation mechanism. Aiming at the key factors restricting the development of engine cooling water pump.

And some scholars have carried out in-depth research from three aspects of energy performance, cavitation performance and reliability, and made a lot of related research results, constantly improving the performance and quality of engine cooling water pump. The efficiency of the engine cooling water pump is 10% - 20% lower than that of the ordinary centrifugal pump, while the efficiency of the engine cooling water pump in China is 7% - 15% lower than that in foreign countries. In order to improve the efficiency of the engine cooling water pump, many scholars have carried out a lot of research work in the performance prediction and internal flow. On this basis, the hydraulic performance of the engine cooling water pump has been optimized design and structural improvement. The research on the internal flow of engine cooling water pump is of great significance to improve the efficiency, improve and optimize the structure. However, these research methods are not perfect. In view of the particularity of high temperature and variable speed of engine cooling water pump, the accuracy of numerical simulation needs to be further improved. High speed photography and PIV test are widely used in common centrifugal pumps as effective test methods to study the internal flow of pumps.

Interchangeable Water Ring Vacuum Pump

Water Ring Pump

Water Ring Vacuum Pump

Start up of vacuum pump

Start up of vacuum pump

No matter what device is used for a long time, there will be such and such problems. Vacuum pump is so, when normal operation suddenly strike, it is really confusing. Let's talk about several starting problems of vacuum pump.

1、 The device cannot be started

1. Possible causes: insufficient power supply of motor leads to insufficient speed; insufficient water supply; too large clearance between impeller and distribution board; mechanical seal damage leads to water leakage and air leakage; impeller wear is too much; circulating water cannot be discharged.

2. Troubleshooting: check whether the power supply voltage is within the rated voltage range of the motor; increase the water supply (control within the correct range, otherwise the motor will be overloaded and heated); reduce the clearance between the impeller and the distribution board (generally 0.15-0.20mm); replace the mechanical seal; replace the impeller; check the pipeline at the water outlet.

2、 The vacuum pump is noisy after starting

1. Possible causes: insufficient power supply voltage of the motor; lack of phase operation of the motor; corrosion caused by long-time unused pump; suction of sundries in the pump; impeller drag distribution board.

2. Troubleshooting: check whether the power supply voltage is too low; check whether the motor wiring is reliable; if the pump is not used for a long time, add a little rust remover or open the pump cover to remove the rust manually; open the pump cover to remove the sundries; adjust the distance between the impeller and the distribution board.

3、 The device is difficult to start

1. Possible causes: the water level in the vacuum pump is very high when starting; the packing gland is too tight; the internal parts are rusted; the discharge pressure is increased or the back road is not smooth; the power distribution room is in fault.

2. Treatment method: start according to the specified water level (below the automatic drain valve); loosen the packing gland; pull the rotor hard and wash it with water supply; check whether the back path is smooth and reduce the pressure; contact the electrician for treatment.

The above is a detailed introduction to several problems of vacuum pump start-up. Failure to start, difficulty in start-up, loud noise after start-up, etc. are common problems of abnormal equipment. If similar problems are encountered, they can be remedied in time according to the above content to avoid affecting the work.

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How to reduce vibration of water ring vacuum pump

Compared with the most common SK series water ring vacuum pump, the water ring vacuum pump has the characteristics of strong corrosion resistance, high limit vacuum degree and large exhaust volume. It is widely used in food, petroleum, chemical industry, metallurgy and other fields. It can also pump various gases and corrosive gases without solid particles.

There are two main shock absorption methods: to reduce the vibration of the motor and the transmission shaft, SK water ring vacuum pump is used for transmission, and the rigid connection between it and the transmission shaft is changed to elastic connection. By using elastic sleeve pin coupling, the maximum compensation displacement and compensation angle can be adjusted, so that the vibration of motor and transmission shaft can be compensated by elastic coupling, and will not be directly transmitted to sk water ring vacuum pump.

Considering that it is difficult to reinforce SK water ring vacuum pump, the method of welding "stiffener" in the outlet steel pipe is adopted. Along the inlet and outlet direction, the two end flanges of the connecting steel pipe between the expansion pipe at the outlet of SK water ring vacuum pump and the outlet valve can be welded with several steel plates of specified thickness and width after consulting the seller. Add the rigidity of steel pipe, reduce the deformation and resist the displacement.

Water Ring Vacuum Pump manufacturers

What is water ring vacuum pump

industrial vacuum compressor

Selected water ring vacuum pump

As for the water ring vacuum pump, to ensure its safe and stable operation, it is for power and stability. If it operates near the limit vacuum degree and Zui high exhaust pressure, the power of the vacuum pump is very low, and the operation is very unstable, so it is easy to have vibration and noise. And the water ring vacuum pump is easy to have cavitation phenomenon, resulting in damage to pump body, impeller and other parts, and even unable to work.

After having basic parameters, in the process of pump selection: if the vacuum degree or exhaust pressure required by the pump is not high, the single-stage pump can be selected preferentially; if the vacuum degree or exhaust pressure is high, the single-stage pump is often not satisfied, and it may be required that the pump still has large air extraction capacity and safe air extraction function under the condition of high vacuum degree, the double-stage pump can be selected.

If the vacuum degree is required to be more than - 710mmhg, the water ring pump unit of gas injector can be selected as the vacuum pumping equipment to improve the pumping speed of the equipment under low pressure and prevent the cavitation phenomenon of the water ring vacuum pump together. If it is only used for vacuum pump, it is better to choose single effect pump, with simple structure, easy protection and good cavitation resistance under high vacuum.

If still be used as compressor perhaps, choose double effect pump more appropriate. The double effect pump has the advantages of large air volume, small volume, active balance of radial force, less fatigue cracking of shaft and long service life.

Direct Coupled Water Liquid Ring Vacuum Pump

Water Ring Pump

Water Ring Vacuum Pump

Water ring vacuum pump in chemical industry

Water ring vacuum pump in chemical industry

The application of water ring vacuum pump in chemical industry mainly includes anticorrosive water ring vacuum pump, 2BV liquid ring vacuum pump and water ring vacuum unit. There are many main factors that affect the working power of water ring vacuum pump, such as scale inside, and its exhaust pressure to be mentioned in this paper.

During the operation of vacuum pump, air will be continuously discharged from the pump body, forming the vacuum degree required by the operation at the suction port, so the exhaust pressure is also another main factor affecting the working power of water ring vacuum pump. The exhaust pressure will have a huge impact on the suction capacity and shaft working power consumption of vacuum pump. When the vacuum pump system is working, if its exhaust pressure is higher.

The smaller the suction capacity of the vacuum pump, the greater the power consumption of the corresponding shaft. On the contrary, when the exhaust pressure of the system is smaller, the larger the suction capacity of the vacuum pump, and the smaller the power consumption of the corresponding shaft.

In the process of practical work protection, it is necessary to investigate the exhaust pressure data of vacuum pump system in real time. In case of abnormal exhaust pressure data, corresponding measures shall be taken immediately to update and reconstruct the whole vacuum system, so as to improve the working mechanical power of water ring vacuum pump.

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5HP Water Ring Vacuum Pump

Installation and test run of vacuum pump

Vacuum pump is an important part of oil and gas recovery device, and its reliability determines the reliability of long-term operation of the device. The low installation quality of vacuum pump will directly cause system vibration and affect the normal use of the whole device. Therefore, the correct installation and commissioning of vacuum pump is very important.

Vacuum pump installation

1) Check the foundation quality.

2) The foundation surface shall be leveled around the installation pad iron, and the pad iron shall be installed after the trial installation and good contact.

3) Install the base plate. Put the unit on the basis of embedded foundation bolts, and keep the unit level by adjusting the iron wedge pad. After correction, the anchor bolts shall be tightened to prevent movement.

4) Pour the base and foundation bolts with concrete (secondary grouting). The base must be filled and tamped at the same time.

5) After the concrete is solidified (generally one week later), check whether the base and anchor bolts are loose, then tighten the anchor bolts and recheck the levelness of the pump shaft. At the same time, a 10-15mm thick smooth cement mortar protective layer shall be applied on the foundation, and the sizing block shall not be exposed.

6) Correct the concentricity of pump shaft and motor shaft. The general method is to adjust the motor based on the pump. When there is a gearbox between the pump and the motor, install the gearbox first, and then install the pump and the motor based on it.

7) After installing the pipeline and accessories of the unit, recheck the concentricity.

8) The pipeline shall have a separate support, and the pump unit is not allowed to bear the pipeline load. Sundries in the pipeline shall be cleaned.

9) After the foundation strength reaches 100%, the test run can be carried out. Before the test run, check whether the rotation direction of the motor is consistent with the mark, and conduct the test run for 4H according to the pump operation regulations.

10) During the test run, the operation of each part of the pump shall be checked comprehensively, and the test run record shall be filled in, and the pump shall be handed over for use after it is normal.

Water Ring Vacuum Pump manufacturers

What is water ring vacuum pump

industrial vacuum pumps compressor