Expansion valve of an air conditioning system in an automobile
First Claim
1. 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.
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Accused Products
Abstract
The present invention discloses an expansion valve of an air conditioning system for an automobile which does not employ a conventional method that opens and shuts in response to a motion of a pin and ball and can control a flow of a refrigerant and control linearly a flow rate of a refrigerant flow into an evaporator by using holes of a fixed hole plate fixed to a valve body and holes of a rotatable cam which is rotated by a motion of a pin moved upward and downward in response to a pressure difference between an outlet of an evaporator of an expansion valve and an interior of a pressure proof barrel. In the expansion valve of the present invention, it is possible to prevent a huntting phenomenon a reverse flow of the refrigerant into the evaporator and a noise caused by a ball, which have been generated in a conventional expansion valve, from creating.
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Citations
4 Claims
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1. 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, comprising
a 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. - View Dependent Claims (2, 3, 4)
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Specification