Roots vacuum pump how refrigeration?
2021-10-18
Summary
How to cool roots vacuum pump? 1. Internal cooling of the rotor: In order to make the Roots vacuum pump work under a higher pressure difference, a cooling method can be adopted, that is, the rotor is cooled by circulating oil, and the oil holes and oil passages are driven into the shaft at both ends of the pump shaft. Head, and then discharged from the other end through the inner wall of the rotor. In addition to cooling the rotor, the cooling oil also lubricates the gears and bearings. This cooling effect is very good. When the pump is running, the rotor temperature is lower than the casing temperature. This method is usually used for large pumps. For example, when working under a pressure difference of 80 Torr, the rotor temperature of the Roots vacuum pump is 78 degrees lower than that of the housing. Simultaneously
How to coolRoots vacuum pump?
1. Rotor internal cooling: in order to makeRoots vacuum pumpWorking under a higher pressure difference, a cooling method can be adopted, that is, the rotor is cooled by circulating oil, the oil hole and the oil circuit are respectively driven into the shaft head at both ends of the pump shaft, and then discharged from the other end through the inner wall of the rotor. In addition to cooling the rotor, the cooling oil also lubricates the gears and bearings. This cooling effect is very good. When the pump is running, the rotor temperature is lower than the casing temperature. This method is usually used for large pumps.
For example, when working at a differential pressure of 80 torr,Roots vacuum pumpThe rotor temperature is 78 degrees lower than the housing. At the same time, it is found that the heavier the pump load, the larger the gap. This is because the rotor is oil-cooled, which is at a temperature lower than that of the housing. The greater the load, the more severe the expansion of the housing, the greater the distance between the shafts, and the resulting gap.
Due to the heavy load, the temperature difference between the rotor and the casing continues to increase, resulting in a large gap, which will increaseRoots vacuum pumpreverse flow, reducing pump speed. In order to overcome this shortcoming, it is necessary to take measures when the Roots pump is working under high load. Usually,Roots vacuum pumpThe housing and rotor are cooled simultaneously by an oil circulation system.
2. Rotor oil film cooling: This cooling method is inRoots vacuum pumpAn oil pipe is connected to the inlet, and the heat of the rotor is taken away by a uniform drop of cooling oil. The oil passes through the filter and cooler, passes through the well-sealed oil pump, and then is delivered to the pump inlet through the oil pipe. After the oil droplets reach the rotor, as the rotor rotates, the oil droplets are on the surface of the rotor.
This not only takes away the heat of the rotor, but also forms an oil film on the surface of the two rotors to prevent the gas from flowing back, and also takes away the fine dust attached to the surface of the rotor. An oil tank is provided at the outlet of the pump to collect, filter, cool and reuse the waste oil. However, due to the oil in the pump, the characteristics of the oil-free vapor pollution vacuum system of the Roots pump are lost. In addition, the oil has a certain viscosity, which will add a lot of friction to the high-speed rotating Roots pump rotor, which will definitely increase the power consumption of the pump. For the oil used, the saturated steam pressure should be changed as much as possible.
3. Water cooling: the so-called wetRoots vacuum pump, Refers to the air sucked by the inter-stage or two-stage pump, which is compressed and transmitted through a combined muffler with comprehensive absorption and phase difference. The heat generated by the compressed air can be removed by injecting a small amount of water into the pump. The suction pipe is installed at the suction end of the single-stage or two-stage pump set and connected to the air inlet of the vacuum pump. The water is sucked away by the vacuum created by the vacuum pump. The greater the vacuum degree, the higher the water absorption rate. Simple control valve can ensure good air intake. The temperature of the suction water should be maintained at about 20°C.
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