JPS60175877A - Rapid closing type check valve - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Field of application in industry] Misfire'! It't; L, Cj It relates to a quick-closing non-return valve ↑ which is a generic concept of the first item of the scope of the claims.

[Conventional technology]

One such check valve is known as West German Patent No. 1°043.
No. 737. In this known check valve, a damping cylinder is integrated into the valve housing from the outside. The cylinder chamber of the buffer cylinder is connected to the inside of the valve box through d and Y, and in the closing valve position, 111 on the piston side
．． The end is located in the area of the wall where the buffer cylinder is separated from the box and the other 7 is in the open position.
Is the piston 1' so that the 74 end is positioned within the area of the curve? i4 is 1. IJ is included.

When the check valve 1 is configured in this way, the JJI style IJJi
Since the area can only be set up in a very small area, the valve closing operation of the valve body is hardly affected by the effect of heat exchange.

Check valve ↑ is kept in the open position by the flow force of the fluid acting on the body.For example, supply)ゞ+%, ,7
) When a pipe is damaged and the flow becomes insufficient, a pressure drop occurs, and in 1 case of 1 injury, one passage is automatically and quickly closed by the valve body, preventing the flow from flowing backwards. If you want to keep the flow as low as possible, it's 41.

However, if the valve body is suddenly closed in this way, 1) there is a risk that a force collision will occur and the closing valve will hit the valve seat very strongly. By slowing down the closing speed, the dangerous situation described above is avoided.

In other known check valves (West Germany '111 Permit No. 2)
．． 757.352), the shock absorber screws I and N are ti2 tJ and i only after the second stage of the valve closing stroke begins.
It is designed to fit inside the cylinder. N) 24J
Since a ring gap is provided between the inner wall of the I cylinder and the piston, the piston moves in the Sakuramura I cylinder without contact until it reaches the non-Mljj position. However, the ring gap between the screw I and the damping cylinder impairs the damping effect of the closed cylinder movement.

[Purpose of the invention]

I want to come to Raikou I! 1, a check valve of the type mentioned at the outset, which is capable of guiding the shaft through the entire process in a buffer cylinder with a small gap maintained; It is something. Tsunawara,
An object of the present invention is to improve the above-mentioned type of check valve so that it can provide an effective damping effect even when the valve closing operation is IJ (IJ).

In order to achieve the above object, a quick-closing check valve has been proposed according to the present invention, which is characterized by the configuration described in the feature of claim 1. Regarding advantageous embodiments of the invention, reference is made to subclaims 2 to 4 of the appended claims 'R1'ii'.

〔Effect of the invention〕

In this check valve, the piston is
Since it is guided in the liner of the 'B, i+i cylinder, the play between the piston and the buffer cylinder can be made very narrow in order to effectively dampen the valve-closing action. Although the provided through-hole has a predetermined cross-sectional shape, this cross-sectional shape can be changed as necessary.Therefore, changes in closing speed ζ, etc. can be reversed. You can do a lot of things with stop valves.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings shown in FIG.

The quick-closing check valve shown in the figure consists of a valve box 1, a man 11, a man 11, a man 11, a man 11, a man 11, a man 11, a man 11, a man 11, a man 11, a man 11, a man 11, a man 11, a man 11, a man 11, a man 11, a man 11, a man 11, a man 11, a man 11, a man 11, a man 11, a man 11, a man 11, a man 11, a man 11, a man 11, a man 11, a man 11, a man 11, a man 11, a man 11, a man 11, a man 11, a man 11, a 3142 hand 3, and 1. There is a locus 4 and a locus 7-C. The cover 5 is fixed to the box 11' using bolts 6.

1i, l stop surface 7 (iii) The valve body 8 moves in the axial direction"J: I'e.

It is arranged inside the valve box 1. The pull-feel rim 9 is brought into contact with the sealing surface 7 of the valve body 8.

A valve element IO is placed on the side of the valve element 8 that is remote from the inlet side joint 2.
is fixed, and the valve 4K" L O is guided in the inner funnel 11. A piston 12 is attached to the upper end of the valve (Lj), and the piston 12
is guided by the motion in the buffer cylinder.

It consists of a loose 1jJ cylinder Lj linenau 13, and a space 14 with a large diameter continues to the liner 13. The liner +3 forms an extension of the guide bushing 11, and together they form one part. The liner 13 is held between the eyebrow formed on the valve body 1 and the shoulder at the end of the cover 5. Inside the cover 5, there is provided a recess with 1 open downward, forming a space 14 above the liner 13.

The piston 12 is inserted into the cylinder so that the screw I/n 12 is guided inside the liner 13 over the entire surface (+11) while maintaining a very small play with respect to the surface. .

Is there a ring in one part of the piston 12? M: Only some 5's are engraved, this /fY, 15 is 1 of 1 nohirinsu buff-1-ng (forced).

A ring-shaped side wall projects from the piston 12 on the side facing the valve body 8 .

A tj through hole 16 is bored in this side wall;1. 1. When the piston 12 reaches the two wheels (as shown in the right half of the drawing), tJ is reached.1. ) I open in the space 14 located at 1', and the piston 12 (as shown in the left 1'1 minute of figure i'11) opens at 1...'il,
The through hole 16 is positioned so that the liner 13 is housed when the i''r is reached.

The lower part of the through hole 16 has a constant width, and the width becomes narrower from the top to the top.The surface is designed in a triangular shape.

Yes.

A plurality of throttle holes 17 each having one diameter are provided through the piston 12 in the axial direction. The liner 13 also has one or more holes 18 axially extending through it, through which the valve body 1 communicates with the space 14 of the piston l>!

The flow force of the medium flowing through the population side &l'1 hand 2 holds the valve body 8 in the open state (as shown in the right half of the drawing). For example, when the inlet side phase of j1 part 1 (connected to hand 2) is scratched and the flow condition becomes defective, the pressure drop created by the skill of part 8 of j1 will automatically cause The pipe Ilδ on the faulty side is blocked between the bittern i' and v. Closing valve 1' operation of the valve body 8 GJ
'First l? il is aII during which the valve closing operation is performed without buffering;
and width decreases. Therefore, the amount of fluid discharged through the cylindrical space below the piston I2 through the i,'i 1ffl hole 1 (i also decreases.gi' 1il
After the l hole 16 is completely blocked by the liner 13, the fluid (Jl) is discharged through the throttle hole 17b].

However, the valve closing operation will be performed with moderate buffering.

Various adjustment characteristics can be achieved by changing the shape of the through hole (6) in response to the demand for changes in closing valve f speed.

[Brief explanation of drawings]

Attachment (=J drawing is a longitudinal sectional view of a check valve according to an embodiment of the present invention, the right half of the drawing shows the valve closed state, and the left half shows the valve closed state. l (jQ group in hand, 4... valve seat, 5... hippo, 6... port 1~.7... J:I stop, 8f1
゛Body, 13...Profile, SuJ, io, Beniho, If...Guidance Bunommu, I2, Jisut-7
, 13... Reiner, 14... Suhas, 15...
・Groove, I6・ ・17F through hole 17・ ・Aperture hole. Patent applicant Toitsue Hubco: Nku Welga Akchengeserschaft I Agent Patent attorney Kimio Hashimoto

Claims (1)

[Scope of Claims] ('') A profile groove projects from the sealing valve face (7) and is guided in a damping cylinder and passes through at least one throttle hole (17) in the axial direction. An axially movable body (8) having a shaft (10) is attached to the piston (12) and connected to the piston (12).
A quick closing 11 made so that squeezing occurs as the piston moves between the space on the side facing the rear valve body (8) of the i cylinder and the valve body (1) of the check valve. Type reverse J1zr smell ζ, seconds? The fi cylinder is everything.'' - Just one person to plan the C piston + 7'J liner (L
The side of the liner (13) facing away from the valve body (8) is open, and the liner (13) is moved into a large diameter space (14) defined by the cover (5). When the check valve reaches the open position, a through hole (1G) is bored in the peripheral wall of the piston (12) on the side of the force applied to the valve body (8). is 1'r bent hole ((1
) opens in the large-diameter space (14), and when the check valve reaches the closed position, the iT through hole (Hill is housed in the liner (13)) is opened. (16
) is positioned at f7. (2) The through hole (16) is reversed 1.1>tt in the valve closing direction
111 that the li song is designed with a larger contour
1. An inverted 11 valve as claimed in claim 1. (3) The through hole (18) is inserted through the liner (l) in the axial direction.
The inverted eleven valve according to the first or second term in the range l'. (4) Around the piston (12), the original condition of Seto 1 and 1st /? Any one of claims 1 to 3 FF, characterized in that I(15) is recessed.
The check valve described in section ``.