Across critical carbon dioxide automobile air conditioner system mechanical conditioning type expansion valve

Abstract

A transcritical carbon dioxide vehicle air conditioning system mechanical conditioning type expanding valve, belongs to the refrigeration technical field. In the invention, a cylinder is arranged on the left of the valve body, and an air inlet pipe fitting is arranged on the right end of the valve body; the cylinder is divided into a left side high pressure chamber and a right side low pressure chamber, wherein the high pressure chamber communicates with an air inlet through the high pressure chamber inlet passage, and the low pressure chamber directly communicates with an air outlet; a high pressure chamber air inlet adjustable bolt is arranged in the high pressure chamber inlet passage; a pretension adjustable bolt is arranged in the cylinder sealing nut; an opening valve spring is arranged on the right side of the pretension adjustable bolt; a valve rod is fixed at the center of the right side of the piston; a spherical valve head is fixed on the right end of the valve rod; a piston connecting rod passes through the center of the opening valve spring; a close valve spring is contacted with the right side of the piston. In the application, the manometrical change of the high and low pressure sides make the cylinder piston in the cylinder move left and right with the valve rod and the spherical valve head, thereby adjusting the flow area of the expanding valve throat, and adjusting the pressure at the high pressure side of the system through adjusting the flux of the refrigerant.

Description

technical field [0001] The invention relates to a throttling mechanism of a refrigeration system, in particular to a mechanically adjustable expansion valve of a transcritical carbon dioxide automobile air-conditioning system, which belongs to the technical field of refrigeration. Background technique [0002] The transcritical carbon dioxide automotive air conditioning system has unique advantages in heat pump performance. Its exhaust temperature is high and the heat transfer performance of the gas cooler is good, which can solve the defect that modern cars cannot provide enough heat to the cabin in winter. At the same time, carbon dioxide is a natural working substance, non-toxic and non-flammable. Therefore, transcritical carbon dioxide automotive air conditioners have been recognized internationally as the most promising next-generation automotive air conditioners. [0003] At present, the components of transcritical carbon dioxide automotive air conditioners are still i...

AI Technical Summary

Problems solved by technology

In this scheme, a main throttle short tube and an auxiliary throttle short tube are set up, the main throttle short tube is always open, the change of the flow rate is adjusted by the auxiliary throttle short tube, and the adjustment range is limited; on the other hand, the The high-pressure gas inlet of the short throttle tube is directly connected to the high-pressure chamber, and the cylinder piston responds too quickly to the pressure change on the high-pressure side of the refrigeration system, which is likely to cause serious system oscillation under certain operating conditions, which greatly affects the stability of the refrigeration system. sex

[0005] So far, there has not been an expansion valve that is suitable for transcritical carbon dioxide automotive air conditioning systems, does not need to introduce additional drive circuits, completely uses system pressure differential drive control, and has stable regulating performance.

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