Expansion valve

Abstract

The invention discloses an expansion valve, which comprises a valve body, a spool and a driving part. A first flow passage for refrigerant to flow is transversely arranged in the valve body. The first flow passage is communicated with the inlet and the outlet of the valve body. A main flow hole is vertically arranged in the valve body above the first flow passage. A main flow port is arranged in the first flow passage at a position corresponding to the main flow hole. The upper part of the spool is arranged in the main flow hole to isolate the main flow hole from the first flow passage. The lower part of the spool corresponds to the main flow port. The spool moves up and down along the main flow hole to open or close the main flow port. A second flow passage which is in parallel with the main flow hole is additionally arranged in the valve body at a position above the first flow passage. The second flow passage is communicated with the first flow passage. A diversion structure is arranged between the second flow passage and the main flow hole. A silicon wafer for opening or closing the diversion structure is arranged in the driving part. The expansion valve has the advantages that the structure is simple, the expansion valve is convenient to manufacture, the flow of the refrigerant can be accurately controlled, the power consumption is low and the safety and the reliability are high.

Description

Technical field [0001] The present invention relates to a valve, especially an expansion valve. Background technique [0002] In existing air conditioning systems, thermal expansion valves and electronic expansion valves have been mostly used. The thermal expansion valve controls the refrigerant flow into the evaporator by sensing the superheat of the refrigerant at the outlet of the evaporator. The reaction time is slow, the welding process is difficult, and the precise control of the refrigerant cannot be achieved; the electronic expansion valve is controlled by a stepping motor. The opening degree of the port can accurately control the refrigerant flow, but the flow control cannot be completely linear, and the mechanism is complicated and the system reliability is not good. Summary of the invention [0003] The problem to be solved by the present invention is to provide an expansion valve with simple structure, convenient processing, accurate control of refrigerant flow, low p...

AI Technical Summary

Problems solved by technology

Among them, the thermal expansion valve controls the refrigerant flow into the evaporator by sensing the superheat of the refrigerant at the outlet of the evaporator. The reaction time is slow, the welding process is difficult, and the precise control of the refrigerant cannot be realized; the electronic expansion valve controls the valve through a stepping motor. The opening of the opening can accurately control the refrigerant flow, but the flow control cannot be completely linear, and the mechanism is complicated, and the system reliability is not good

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