Precautions when Selecting a Liquid Ring Vacuum Pump

Liquid Ring Vacuum Pump is a rough pump using liquid as the working medium. Among them, water ring vacuum pump is used as working medium. Others can also use oil, sulfuric acid and acetic acid as working medium. Most industrial water ring vacuum pump applications. Liquid ring vacuum pumps are divided into single-stage and double-stage, and the difference between single-acting and double-acting. Single-stage and double-stage vacuum pumps refer to the number of stages of their impellers; single / double-action vacuum refers to the form of their impellers / housings. The impellers of single-acting impeller vacuum pumps undergo one suction / exhaust after one revolution of the gas; Gas inhalation and exhaustion twice.

Liquid Ring Vacuum Pump

So what should you pay attention to when choosing a liquid ring vacuum pump? The Liquid Ring Vacuum Pump Manufacturer will tell you next.

 The type of pump is mainly determined by the amount of air, vacuum or exhaust pressure required for the job. When the pump is working, there are two aspects to pay attention to:

1. It is required to operate in the high-efficiency zone as much as possible, that is, in the area of critical vacuum or critical exhaust pressure.

2. Avoid running near the maximum vacuum or maximum exhaust pressure. Running in this area is not only extremely inefficient, but also very unstable and prone to vibration and noise. For vacuum pumps with a high degree of vacuum, cavitation often occurs in this area. The obvious sign of this phenomenon is noise and vibration in the pump. Cavitation will cause damage to the pump body, impeller, etc., making the pump inoperable.

According to the above principles, when the vacuum or gas pressure required by the pump is not high, it can be preferentially selected in a single-stage pump. If the degree of vacuum or exhaust pressure is high, single-stage pumps often cannot be met, or the pump is required to still have a large amount of air under a high degree of vacuum, that is, the performance curve is flat at a higher degree of vacuum. Stage pump. If it is only used for vacuum pump, it is better to choose single-acting pump. Because the single-acting pump has a simple structure, it is easy to manufacture and maintain, and it has good cavitation resistance under high vacuum conditions.

If it is only used as a compressor with a large air volume, a double-acting pump is more suitable. Because the double-acting pump has large air volume, small volume, light weight, radial forces can be automatically balanced, the shaft is not prone to fatigue fracture, and the pump has a longer service life.

In addition, the following should be noted:

1. Under the working pressure of the vacuum pump, it should be able to exhaust all the gas generated during the vacuum equipment process.

Correctly combine the vacuum pump. Due to the selective pumping of vacuum pumps, sometimes a pump cannot be used to meet the pumping requirements. Several pumps need to be combined to complement each other to meet the pumping requirements.

2. Vacuum equipment requirements for oil pollution. If the equipment strictly requires no oil, you should choose various oil-free pumps, such as: water ring pumps, molecular sieve adsorption pumps, sputtering ion pumps, cryopumps, etc. If the requirements are not strict, you can choose to have an oil pump, plus some oil pollution prevention measures, such as adding cold traps, baffles, oil traps, etc., can also meet the requirements of clean vacuum.

3. How does the oil vapor from the vacuum pump affect the environment? If the environment does not allow pollution, you can choose an oil-free vacuum pump or exhaust oil vapor to the outside.

4. Does the vibration generated by the vacuum pump affect the process and the environment? If the process is not allowed, a vibration-free pump should be selected or anti-vibration measures should be taken.

5, the price of vacuum pumps, operation and maintenance costs.

The above are the precautions for selecting a liquid ring vacuum pump introduced by Pressure Regulating Valve Supplier. Have you learned it?