Expansion apparatus and refrigerant cycle of vehicle air conditioner using the same

Abstract

To provide an expansion apparatus capable of reliably producing an effect of reducing refrigerant flow noise and a refrigerant cycle of a vehicle air conditioner using the expansion apparatus. In an expansion apparatus 1 in which a valve body 41 of a refrigerant flow rate adjustment mechanism 40 is accommodated in a valve chest 5 of a main body 2 to which a refrigerant is led, a first narrow portion 4 is provided between a lead-in passage 3 and the valve chest 5, and a second narrow portion 6 having a flow passage area smaller than that of the first narrow portion 4 is provided between the valve chest 5 and a lead-out passage 7, the valve chest 5 is formed so as to have a space S around the valve body 41 and the first narrow portion 4 is formed so as to face the space S around the valve body 41, so that the refrigerant led to the valve chest 5 from the first narrow portion 4 flows toward the second narrow portion 6 through the space S around the valve body 41 without passing through a coil spring 43.

Description

technical field [0001] The present invention relates to an expansion device and a refrigerating cycle of a vehicle air conditioner using the expansion device, and seeks to improve the structure for reducing the refrigerant flow sound when the refrigerant passes through a throttle portion provided between a valve chamber and a lead-out passage. . Background technique [0002] When operating in the refrigeration cycle, if bubbles are mixed into the liquid refrigerant introduced into the expansion device through the condenser, when the refrigerant passes through the orifice between the valve chamber and the outlet passage of the expansion device, there will be a Air bubbles in the refrigerant cause undesirable conditions that generate refrigerant flow sounds. [0003] Therefore, like the refrigerating cycle shown in Patent Document 1, for example, an invention has been disclosed whose object is to eliminate or reduce air bubbles in the refrigerant before the refrigerant passes...

AI Technical Summary

Problems solved by technology

Since the refrigerant introduced into the valve chamber 202 from the opening 205a of the throttle part becomes turbulent under the action of the elastic member 208, and passes through the throttle hole 203 in a state where bubbles are newly generated or bubbles grow in the refrigerant, Also in this expansion device 200, there is a possibility that the effect of reducing the refrigerant flow sound cannot be sufficiently exhibited.

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