When pump selection, as much as possible to understand the conditions of the pump in detail, in addition to technical parameters, the characteristics of the transmission medium and pump suction conditions, installation conditions have to understand, and now to inventory Three screw pump selection points what are the points. Three screw pump selection of three screw pump should pay attention to the following points First, the choice of speed 1, the transmission medium viscosity and pump size to determine the speed range High viscosity medium, the pump should be selected low speed, if the viscosity is low, the corresponding Selectable high speed: 1) For medium viscosity> 20 ° E, for large size three-screw pumps (main bar outside diameter 60 mm and over), the speed should be 970rpm or 720rpm. If the viscosity is higher (viscosity> 80 ° E) Such as viscose, can reduce the speed of use, recommended 200-500rpm; 2) For small size three screw pump medium viscosity> 20 ° E, the speed of 1450rpm or 970rpm is appropriate, if the viscosity is higher (viscosity> 80 ° E), can reduce the speed of use, recommended 300-600rpm; 2, due to the higher pump speed, the same performance parameters, the smaller the pump size, but because of high speed, high friction power, pump wear large, Life expectancy is short, if the transmission medium lubrication is relatively poor or contains trace impurities, should choose a lower speed, so that the pump to maintain a longer life expectancy, it is recommended below 1450rpm. Second, the choice of structure 1, the transport of lubricants, the temperature below 80 ° C select the built-in bearing structure of the pump; 2, the temperature exceeds 80 ° C or the transmission medium lubrication is poor, select the external bearing structure of the pump; The transmission of poor mobility, high viscosity medium or the need for the medium to be heated or insulated double-layer heat pump structure to choose the pump; 4, high temperature transport, should choose the pump made of high temperature materials. Third, the matching matching pump selection is determined, according to the sample data can be found three screw pump shaft power N, the shaft power coupled with a certain power reserve, as a basis for optional motor, the general motor power Nm Should not be less than the value obtained by multiplying the pump shaft power N by the power reserve factor K, and the value of K can be taken as follows: N (KW) ≤5 5 * N≤10 10 N> 50 Nm (kw) ≥1.25 * N ≥ 1.2 * N ≥1.15 * N ≥1.1 * N Three screw pump flow, pressure in the same speed, viscosity is approximately linear relationship, the higher the pressure, the smaller the flow. The same viscosity, pressure, three screw pump flow and speed is approximately proportional. The same speed, viscosity, shaft power and pressure is approximately proportional. The same viscosity, pressure, shaft power and speed is approximately proportional. As the viscosity increases, both flow and shaft power increase, but because of the complex relationship between them, consult a specialist if necessary. In short, as long as the proper selection, maintenance and reasonable, three screw pump can ensure satisfactory operation. Further Reading: pump valve pipe fittings Exhibition 2016 Exhibition of Information Industry, Internet (Xiamen) Technology Co., Ltd. Author: Asian pumps Network Editor: Yao Xiaoxia (QQ / micro letter:) http://beng.liuti.cn/ (Hotline :)
The compressor circulates the refrigerant and increases the temperature and pressure of the gas refrigerant to make it easy to liquefy in the condenser.
The condenser condenses the refrigerant to release heat absorbed in the evaporator.
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