Patent ID: 6397616
Filing Date: 2002-06-04
Classification: F25B

Abstract:
A pressure reducer for decompressing refrigerant, comprising:a body member defining an intermediate space thereinside; variable restrict means provided at a refrigerant flow upstream side of the intermediate space, said variable restrict means including a fixed valve seat and a valve body, said valve body displacing in accordance with a pressure difference between at an upstream side and a downstream side thereof; and fixed restrict means provided at a refrigerant flow downstream side of the intermediate space, into which refrigerant having passed through said variable restrict means flows, wherein passage sectional area of the intermediate space is larger than passage sectional area of said fixed restrict means, length of the intermediate space is larger than a predetermined length allowing the refrigerant injected out of said variable restrict means to expand more than the passage sectional area of said fixed restrict means, said variable restrict means has a restrict passage, and said restrict passage is formed into a shape such that the refrigerant having contracted at an inlet thereof adheres to an inner wall surface of the intermediate space to be decompressed by tubular friction.