Selection of Liquid Ring Vacuum Pump

The liquid ring vacuum pump is an eccentric rotor with multi-blades installed in the pump casing. When it rotates, it throws liquid (usually water) to the pump casing and forms a liquid ring concentric with the pump casing. The liquid ring and the rotor blades form a volume, and the rotary variable capacity vacuum pump changes periodically. The most common liquid ring vacuum pump is the water ring vacuum pump. This water ring vacuum pump is mainly used in the process of rough vacuum and large pumping volume, and has been widely used in chemical, petroleum and light industry sectors. The advantages of this pump are: simple structure, easy manufacture, reliable work, convenient use, strong durability, and very large gas that can be pumped, including corrosive gas, dusty gas, and gas-water mixture.

The following Liquid Ring Vacuum Pump Manufacturer introduces the small knowledge of what matters to pay attention to when choosing a liquid ring vacuum pump.

1. Understand the composition of the gas being pumped. The gas contains no condensable vapor, whether there is particulate dust, and whether it is corrosive. When selecting a vacuum pump, you need to know the gas composition and select the appropriate pump for the gas being pumped. If the gas contains vapor, particles, and corrosive gases, you should consider installing auxiliary equipment such as condensers and dust collectors on the pump's inlet pipe.

2. Correctly select the working point of the liquid ring vacuum pump. Each pump has a certain working pressure range, such as: SPECK V series water ring vacuum pump working pressure range 760mmHg ~ 33mmHg (absolute pressure), in such a wide pressure range, the pumping speed of the pump changes with pressure (detailed changes Refer to the performance curve of the pump), its stable working pressure range is 760 ~ 60mmHg. Therefore, the working point of the pump should be selected within this range, which does not allow it to work under 33mmHg for a long time.

3. How does the oil vapor from Liquid Ring 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. Does the vibration generated during work have an impact on 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. Vacuum pump price, operation and maintenance costs.

Liquid Ring Vacuum Pump

4. Correctly combine the liquid ring vacuum pump. Because of selective pumping, sometimes a pump cannot meet the pumping requirements. Several pumps need to be combined to complement each other to meet the pumping requirements. For example, the titanium sublimation pump has a high pumping speed for hydrogen, but cannot pump helium, while a tripolar sputtering ion pump (or a bipolar asymmetric cathode sputtering ion pump) has a certain pumping speed for argon. Combined, the vacuum device will get better vacuum. In addition, some vacuum pumps cannot work under atmospheric pressure and require pre-vacuum; some vacuum pumps have outlet pressures lower than atmospheric pressure and require foreline pumps, so they need to be combined for use.

5. Its working pressure should meet the ultimate vacuum and working pressure requirements of vacuum equipment. For example, a vacuum drying process requires a working vacuum of 10mmHg, and the ultimate vacuum of the vacuum pump selected should be at least 2mmHg, and preferably 1mmHg. Generally, the ultimate vacuum degree of the pump is selected to be half to one order of magnitude higher than the working vacuum degree of the vacuum equipment.

6. 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.

The above are the precautions for the selection of liquid ring vacuum pumps introduced by Centrifugal Pump Supplier.