JPH0167380U

JPH0167380U -

Info

Publication number: JPH0167380U
Application number: JP1987161378U
Authority: JP
Priority date: 1987-10-23
Filing date: 1987-10-23
Publication date: 1989-04-28
Anticipated expiration: 2002-10-23
Also published as: JPH067236Y2

Description

[Brief explanation of the drawing]

第１図は本考案の逆流防止ユニツトの一実施例
を示す縦断面図、第２図は第１図のＡ―Ａ面を矢
の方向に見た一部断面側面図、第３図は第１図及
び第２図の実施例の全閉状態を示す縦断面図、第
４図は本考案の逆流防止ユニツトの実施例を組込
んだ管継手用ソケツトを示す部分断面図、第５図
は同じく逆流防止ユニツトの実施例を組込んだボ
ールバルブ用ボールを示す部分断面図、第６図は
同じく逆流防止ユニツトの実施例を組込んだボー
ルバルブを示す部分断面図、第７図乃至第９図は
それぞれ逆流防止ユニツトの実施例を組込んだ管
継手ソケツトの他例を示す部分断面図である。１……逆流防止ユニツト、２……ハウジング、
２ａ……一端、２ｂ……他端、２ｃ……案内部、
２ｄ……Ｏリング溝、２ｅ……円筒内面、２ｆ…
…環状平面、３……シート、４……ガイド、４ａ
……ガイド孔、５……ジスク、５ａ……ガイド軸
、５ｂ……ガイド部、５ｃ……割り溝、５ｄ……
対向する２辺、５ｅ……頭部、５ｆ……外周面、
５ｇ……鍔部、６……コイルばね、７……Ｏリン
グ。 Fig. 1 is a longitudinal sectional view showing one embodiment of the backflow prevention unit of the present invention, Fig. 2 is a partially sectional side view taken along the plane AA in Fig. 1 in the direction of the arrow, and Fig. 1 and 2 are longitudinal sectional views showing the fully closed state of the embodiment, FIG. 4 is a partial sectional view showing a pipe joint socket incorporating the embodiment of the backflow prevention unit of the present invention, and FIG. FIG. 6 is a partial sectional view showing a ball for a ball valve incorporating an embodiment of the backflow prevention unit; FIG. 6 is a partial sectional view showing a ball valve incorporating an embodiment of the backflow prevention unit; FIGS. 7 to 9 The figures are partial sectional views showing other examples of pipe joint sockets each incorporating an example of a backflow prevention unit. 1...Backflow prevention unit, 2...Housing,
2a...one end, 2b...other end, 2c...guiding section,
2d...O-ring groove, 2e...Cylindrical inner surface, 2f...
... Annular plane, 3 ... Sheet, 4 ... Guide, 4a
... Guide hole, 5 ... Disk, 5a ... Guide shaft, 5b ... Guide portion, 5c ... Division groove, 5d ...
Two opposing sides, 5e... head, 5f... outer peripheral surface,
5g...Brim section, 6...Coil spring, 7...O ring.

Claims

[Scope of Claim for Utility Model Registration] (1) An annular rubber sheet is installed inside near one end of a substantially cylindrical synthetic resin housing, and a synthetic resin guide is detachably attached inside near the other end of the housing. A guide shaft of a synthetic resin disk was inserted into the guide hole of the guide, a coil spring was installed between the guide and the disk, and the guide shaft was divided into sections by grooves in the axial direction. It is composed of a plurality of guide legs, and each of the guide legs is tilted or curved outward so that when the guide shaft is inserted into the guide hole, the disc is pushed into the guide by the repulsion elastic force of the guide legs. A backflow prevention unit characterized in that a guide portion is provided for stably holding the disk and guiding the disk inward from a position of the housing where the sheet is attached. (2) The backflow prevention unit according to claim 1, wherein an O-ring is installed in an annular O-ring groove provided on the outer surface of the housing. (3) The backflow prevention unit according to claim 1, wherein the housing and the guide are connected in a concave-convex manner by the elasticity of both or one of them. (4) The backflow prevention unit according to claim 1, wherein the housing and the guide are screwed together. (5) The guide groove has an approximately square cross-sectional shape as a whole, and has an approximately isosceles triangular cross section whose bases are the two opposing sides of the square.
The backflow prevention unit according to claim 1, which comprises a plurality of said guide legs. (6) The backflow prevention unit according to claim 1, in which the guide portion comprises a cylindrical inner surface that guides the outer peripheral surface of the head of the disc and an annular plane facing the head flange of the disc. .