JPH0293575U

JPH0293575U -

Info

Publication number: JPH0293575U
Application number: JP232389U
Authority: JP
Priority date: 1989-01-11
Filing date: 1989-01-11
Publication date: 1990-07-25

Description

[Brief explanation of drawings]

第１図は本考案の実施例にかかる逆止弁の縦断
面図、第２図は第１図の逆止弁の弁部材の斜視図
、第３図は第１図の逆止弁の作動状態説明図、第
４図は第３図の一部拡大図、第５図は第１図の逆
止弁と従来構造の逆止弁の特性を比較するための
グラフ、第６図は第１図の逆止弁の開弁状態の説
明図、第７図は冷凍装置の冷媒回路の例示図、第
８図は従来の逆止弁の例示図である。２０……ケーシング、２１……ケーシング入口
、２２……ケーシング出口、３１……弁座面、３
２……弁通路部、４０……弁部材、４３……弁体
、４４……被ガイド部材、４４ａ……被ガイド部
材外周面、４８……スプリング、５０……流体通
路部。 1 is a longitudinal sectional view of a check valve according to an embodiment of the present invention, FIG. 2 is a perspective view of a valve member of the check valve of FIG. 1, and FIG. 3 is an operation of the check valve of FIG. 1. 4 is a partially enlarged view of FIG. 3, FIG. 5 is a graph for comparing the characteristics of the check valve in FIG. 1 and the check valve of conventional structure, and FIG. FIG. 7 is an illustrative diagram of a refrigerant circuit of a refrigeration system, and FIG. 8 is an illustrative diagram of a conventional check valve. 20...Casing, 21...Casing inlet, 22...Casing outlet, 31...Valve seat surface, 3
2...Valve passage portion, 40...Valve member, 43...Valve body, 44...Guided member, 44a...Guided member outer peripheral surface, 48...Spring, 50...Fluid passage portion.

Claims

[Claims for Utility Model Registration] 1. A cylindrical valve passage portion 32 having a valve seat surface 31 at one end 32a is provided in a cylindrical casing 20 having an inlet 21 and an outlet 22, and a sliding portion within the valve passage portion 32. The guided member 44 that is movably guided and the valve seat surface 3
The valve member 40 has a valve body 43 seated on or separated from the valve body 43 for opening and closing the valve passage portion 32, and the valve member 40 is biased by a spring 48 so that the pressure of the fluid on the casing inlet 21 side and the casing The check valve is configured to open the valve passage section 32 only when the pressure difference of the fluid on the outlet 22 side is above a certain level, and the valve member 40 is provided on the outer circumferential surface 44a of the guided member 44. A check valve characterized by being provided with a fluid passage section 50 whose effective passage area S increases or decreases as the stroke l increases or decreases. 2 The rate of change in the effective passage area S of the fluid passage section 50 with respect to the change in the stroke l of the valve member 40 is
2. The check valve according to claim 1, wherein the shape of the fluid passage portion 50 is determined so that it is small when the stroke l of the valve member 40 is small and becomes large when the stroke l is large.