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

Abstract

The utility model relates to a mechanically adjustable expansion valve of a transcritical carbon dioxide automobile air-conditioning system, which belongs to the technical field of refrigeration. In the present invention, the left end of the valve body is provided with a cylinder, and the right end of the valve body is fixed with an intake pipe joint. The cylinder is divided into a left high-pressure chamber and a right low-pressure chamber by the piston. The cavity is directly connected with the air outlet, the high-pressure cavity air intake passage is provided with a high-pressure cavity intake adjustment bolt, the cylinder seal nut is internally screwed with a pre-tightening adjustment bolt, the valve opening spring is placed on the right side of the pre-tightening adjustment bolt, and the valve stem is fixed on the piston. At the center of the right side, the spherical valve head is fixed on the right end of the valve stem, the piston connecting rod passes through the center of the valve opening spring, and the valve closing spring contacts the right side of the piston. In the application, the change of the pressure difference between the high and low pressure side can make the cylinder piston in the valve body move left and right together with the valve stem and spherical valve head, so as to adjust the flow area of ​​the throat of the expansion valve, and adjust the system by adjusting the refrigerant flow rate. high side pressure.

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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