The control of the suction temperature of the compressor to be tested is controlled by the suction and exhaust pressure. When the inspiratory pressure is adjusted, the inspiratory temperature also changes accordingly. The controller outputs a control signal to the liquid electronic expansion valve to adjust the flow rate of the supercooled liquid according to the deviation between the temperature at the side of the suction port of the compressor and the set temperature of the working condition. When the suction temperature is higher than the set value of the working condition, the opening degree of the expansion valve is automatically increased, and the opening degree is decreased, ensuring that the suction temperature is well stabilized within the specified fluctuation range. The temperature difference between the inlet and outlet of the calorimeter is to ensure that the temperature difference between the inlet and outlet of the refrigerant gas of the calorimeter is not less than 6 °C. When the suction and exhaust pressure is close to the working condition, the electric heating amount of the calorimeter is determined according to the flow of the main side. Heating can be controlled either automatically or manually.
The test results show that the test device has the following characteristics: (1) The test process fully recovers energy, the running energy consumption is greatly reduced, and the energy saving effect is obvious; (2) Using the mechatronics technology, the most advanced intelligent instruments and actuators at home and abroad are adopted. Such as electronic expansion valve, fuzzy PID controller, etc., combined with fuzzy control theory, realizes automatic control of test system and acquisition and processing of test data; (3) wide range of refrigeration measurement, large adjustment range of working conditions, high measurement accuracy; (4) The introduction of the auxiliary chiller system enables the test device to operate around the clock; (5) The test system software has complete functions, friendly interface and convenient operation. The successful completion of the research on the compressor performance test device ensures that users can make full use of advanced testing methods for quality inspection and new product development research, which creates favorable conditions for improving product performance, reliability, market expansion and market share.
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