Patent ID: 6416032
Filing Date: 2002-07-09
Classification: B60H,F25B

Abstract:
An expansion valve of an air conditioning system for an automobile having a valve body in which a refrigerant flow passage is formed, a pressure proof barrel body comprising a pressure proof barrel sealed with a predetermined pressure by a metal diaphragm, and a device for opening or shutting the refrigerant flow passage in the expansion valve, comprisinga pin having a upper end at which a pin guide having a vertical guide groove is formed, an upper surface with which a lower surface of the metal diaphragm is contacted and a lower portion on which a screw portion is formed; a rotatable cam combined with the screw portion of the pin; a fixed hole plate located at a lower portion of the rotatable cam and fixed to the valve body; a refrigerant wall dividing an inlet and an outlet of the evaporator and having a seal member mounted on an inner circumference through which the pin is passed, whereby a mid portion of the pin can be slid therein; a first spring located between an upper surface of the refrigerant wall and a lower surface of the pin guide at the outlet of the evaporator so as to enable an upper surface of the pin guide to contact with the metal diaphragm; and a second spring installed between a lower surface of the refrigerant wall and the washer so as to enable the rotatable cam to contact with the fixed hole plate.