High-low temperature test chamber with function of protecting compressor and refrigeration system

Abstract

The invention provides a high-low temperature test chamber with the function of protecting a compressor and a refrigeration system. The high-low temperature test chamber comprises the compressor, and high-temperature and high-pressure gas exhausted out of the compressor sequentially passes through a condenser, a drying device, an electromagnetic valve B, a throttle and an evaporator to return to the compressor. An exhaust opening of the compressor is connected with an exhaust pressure sensor and an exhaust temperature sensor. A gas return opening of the compressor is connected with a gas return pressure sensor and a gas return temperature sensor. A compensation electromagnetic valve for too low gas return temperature and pressure is arranged between an inlet of the condenser and an outlet of the evaporator. A cooling electromagnetic valve for too high exhaust temperature and pressure and the throttle are connected between the outlet of the evaporator and an outlet of a dry filter in series. Opening and closing of the cooling electromagnetic valve and the compensation electromagnetic valve are controlled by a control system according to the signals of the exhaust sensors and the signals of the gas return sensors. The exhaust temperature and gas return temperature of the refrigeration system are kept constant all the time, and therefore the constant work temperature of the refrigeration compressor and components in the compressor is guaranteed, a compressor body and the whole refrigeration system are protected by the cooling electromagnetic valve and the compensation electromagnetic valve, and the service life is prolonged.

Description

technical field [0001] The invention belongs to the field of high and low temperature test chambers, in particular to a high and low temperature test chamber with compressor and refrigeration system protection functions. Background technique [0002] As an experimental tool for testing product reliability, the high and low temperature test box is widely used in aviation, aerospace, military industry, electronics, communications, machinery, automobiles, motorcycles, biology, agriculture, climate, environmental protection, building materials and other fields. High and low temperature experiments The temperature stability of the box is of great significance to the performance test of products in some fields with strict temperature and pressure requirements. Once the temperature constant error range is too large, it will affect the performance test results of products in some fields, so the high and low temperature test box The constant temperature accuracy is an important indic...

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Problems solved by technology

[0002] As an experimental tool for testing product reliability, the high and low temperature test box is widely used in aviation, aerospace, military industry, electronics, communications, machinery, automobiles, motorcycles, biology, agriculture, climate, environmental protection, building materials and other fields. High and low temperature experiments The temperature stability of the box is of great significance to the performance test of products in some fields with strict temperature and pressure requirements. Once the temperature constant error range is too large, it will affect the performance test results of products in some fields, so the high and low temperature test box The constant temperature accuracy is an important indicator to evaluate its performance. There is also the problem that the compressor does not have high or low temperature and pressure protection in the high and low temperature test chamber, so how to design a high temperature compressor with the protection function of the compressor and the refrigeration system The low temperature test chamber has become a research topic for those skilled in the art

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