Addtime： 2020-07-18 Browse times： 2733
Roots vacuum pump is equipped with an eccentric rotor with fixed blades. The water (liquid) is thrown to the stator wall. The water (liquid) forms a liquid ring concentric with the stator. The liquid ring and the rotor blade form a variable volume rotary variable volume vacuum pump. In the process of using roots vacuum pump, some factors will lead to the decline of its capacity, so what are the factors affecting roots vacuum pump?
1. Research on working steam and its dryness: low steam pressure and pressure fluctuation have a great impact on the capacity of vacuum pump, so the steam pressure should not be lower than the required working pressure. However, the structural design of the vacuum pump used has been finalized. If the steam pressure is increased too much, the pumping capacity and vacuum degree will not be increased.
2. Research on the requirements of circulating cooling water: if the cooling water supply is insufficient, the condenser will heat up, the sound of air flow will increase, the vacuum degree will drop rapidly, and even the steam will return to the suction pipe.
3. Research on sealing requirements of vacuum pump system: when the vacuum pump is in the limit state, there is little or sometimes no water discharged from the first stage. Therefore, the first stage pump has a large amount of water discharged, it can be considered that the system has leakage. The common causes of air leakage are: the gasket is not installed, installed wrongly or damaged, the bolts are not tightened, the flange surface is damaged, there are sand holes in the weld, and the joints (pressure gauge, vacuum gauge, etc.) are not installed properly.
4. Research on nozzle requirements: nozzle is an important part that affects the performance of vacuum pump. The existing problems are: wrong installation of nozzle, skew installation, blockage, damage, corrosion and leakage. No matter what preventive measures are taken, the blockage of nozzle is inevitable.
You may know something about roots vacuum pump, but what are the environmental requirements of Roots vacuum pump in use, and how much do you know?
Roots vacuum pump not only has good mechanical properties and processing performance, but also meets other performance requirements, such as easy degassing, low saturated vapor pressure, certain chemical stability, certain purity and cleanliness, appropriate radiation capacity, etc. Therefore, roots vacuum pump has its particularity, and the cleaning treatment requirements are extremely strict, so the pollution of parts should be removed or reduced to the maximum extent.
Roots vacuum pump refers to the vacuum process without special requirements. The environmental requirements of this kind of Roots vacuum pump are as follows: all roots vacuum pumps are required to have no accumulated pollution source, no dust, no iron filings and no rust on the surface. The surface of the vacuum chamber of Roots vacuum pump should be smooth and free of defects such as soft tissue, porosity and internal weld. In Roots vacuum pump, the moving parts in the vacuum chamber shall not use oil as lubricant, but diffusion pump oil and silicone oil with saturated vapor pressure shall be used as lubricant, and sealing parts of flange and observation window shall be coated with high vacuum grease. Generally, roots vacuum pump should work in a clean air circulation environment with a temperature of 15-30 ℃ and a relative humidity of no more than 70%. The inlet temperature of cooling water should not be higher than 25 ℃.
Scan QR code and add wechat
Download
Vacuum knowledge
Service
Contact us