In this test, the refrigerant undergoes a different cycle than the conventional refrigeration cycle. The high-temperature and high-pressure refrigerant gas after compression of the compressor is divided into two parts: one part is throttled by the bypass valve and directly enters the mixer; the other part is condensed into the condenser, and is throttled by the throttle valve and then enters the mixer. The two refrigerants are in equilibrium after sufficient heat and mass exchange in the mixer. The superheated vapor in equilibrium is again sucked and compressed by the compressor to complete the cycle. It can be seen from the above refrigeration cycle that when the compressor is running, no cooling is generated to the outside, so there is no need to provide balance heat. The control of the electrical system control electrical system adopts a programmable logic controller (PLC) with convenient operation, strong anti-interference ability and high reliability, which replaces the traditional relay control mode. The electrical control circuit includes a main circuit and a control circuit. According to the test results, the system is stable for less than 10 minutes, and the stability of the working conditions is good and the control precision is high. From the control curve of the performance parameters, it can be seen that after the working condition is stable, the fluctuation of the suction temperature is within 0.2, the fluctuation of the ambient temperature of the compressor is within 0.3, the fluctuation of the suction pressure is within 2 kPa, and the fluctuation of the exhaust pressure is Within 3 kPa, the control accuracy of these parameters is far superior to the control requirements specified by national standards. The compressor is operated under test conditions and the power supply voltage is 1.1 times (242V) of the maximum rated voltage, the overload protector trips, the test is over; if the overload protector is not tripped, the supply voltage is 0.85 times the minimum rated voltage Repeat the test at (187V) until the overload protector trips or a steady state occurs. The test results are as shown. It can be seen from the figure that the automatic protection and alarm devices respond quickly; the control accuracy of the parameters such as the intake air temperature, the compressor ambient temperature, the suction pressure and the exhaust pressure fully meet the control requirements stipulated by the national standards. Conclusion The development of the non-normal working test bench of the compressor meets the technical requirements of the user. The main control parameters of the performance test are higher than the requirements stipulated by the national standard. The whole set is compact in structure, small in size, light in weight, high in automation, and enters work. Condition and stable working conditions are fast and the measurement accuracy is high. Color Ribbon,Label Ribbons,Barcode Printer Ribbon,Thermal Transfer Ribbon Price Guangdong Shuangma Technology Co., Ltd. , https://www.gzsoonmarkprinter.com