Automatic cascade refrigeration system exhaust pressure regulating device

Abstract

The utility model relates to a controlling device used to regulate the discharge pressure of an automatic cascaded refrigeration system, wherein a buffer is positioned between the outlet of a compressor and the inlet of a condenser, the buffer vessel is connected with a by-pass valve, an expanding vessel and a capillary tube in sequence, and the capillary tube is connected with the return duct to form a by-pass branch; the upper outlet of each gas-liquid separator in the middle of and downstream the automatic cascaded system is connected with a pressure control valve, the press control valves are connected with each other in parallel and connected with the expanding vessel by the pipeline. The utility model redesigns the arrangement of the tube so that the low temperature refrigerator based on automatic cascaded circulation can reduce operation pressure and equalizing pressure effectively and protect the compressor and pipeline of the system well; meanwhile, the air branch designed at the upper part of the gas-liquid separator increases the cooling speed of the system and shortens the cooling time of the refrigerator considerably.

Description

technical field [0001] The invention relates to a device for adjusting the discharge pressure of an automatic cascade refrigeration system. Background technique [0002] With the continuous popularization of low-temperature cabinets, the application fields are becoming wider and wider, and all manufacturers want to obtain lower temperatures through continuous improvement of the structure. The system for producing low temperature and ultra-low temperature is mainly based on automatic cascade. With the continuous increase of cascade series, the theoretically obtainable temperature will be lower. As the number of stages in the automatic cascade system continues to increase, the types of refrigerants that need to be charged in the system also increase, especially some refrigerants with lower boiling points, and the total amount of refrigerants in the system is also increasing. This causes the operating pressure and balance pressure of the system to be too high, especially when...

AI Technical Summary

Problems solved by technology

[0003] The invention proposes an adjusting device for the exhaust pressure of the automatic cascade refrigeration system, which can not only overcome the disadvantages of the existing automatic cascade refrigeration system, such as high exhaust pressure, easy damage to the compressor, and rupture of the refrigeration pipeline, but also make the The operating pressure of the entire refrigeration system is reduced, and the system balance pressure is reduced during shutdown; at the same time, the cooling speed of the low-temperature freezer is increased, which greatly shortens the cooling time of the freezer

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