JPS5817985Y2 - pipe fittings - Google Patents

Description

[Detailed description of the invention] This invention relates to a pipe joint, and particularly to a pipe joint in which the 01J ring is suppressed and deformed radially inward through the backup ring using the OIJ ring, the backup ring, and the pushing part at the tip of the collet. be.

A pipe joint of the type in which an 01J ring is inserted into the pipe insertion portion of the joint body is already known as shown in FIG.

In the drawings, 1 is a joint body, 2 is an O-ring with a diameter smaller than the outer diameter of the pipe, 3 is a backup ring, 4 is a collet, 5 is a cap nut, and 6 is a pipe.

However, with this type, the forward movement of collet 4 causes zero
Since it is not possible to deform the 1J ring as much as necessary, the 01J ring 2 is already smaller in diameter than the pipe diameter to provide the necessary margin for sealing, and when the pipe is inserted, the diameter of the 01J ring is expanded at the tip of the pipe. This will damage the O-ring 2, and furthermore, the forward movement of the collet 4 will cause damage to the O-ring 2.
Since the deformation of the 01J ring 2 is not induced, there are drawbacks such as the fact that the crushing margin of the 01J ring 2 cannot be adjusted.

This invention is an improvement on the above-mentioned drawbacks of the conventional pipe joint, and in particular, the 01J groove in the joint body is opened,
When tightening, the press part at the tip of the collet compresses the 01J ring in the width direction via the backup ring, causing it to bulge up and down in the radial direction, creating a seal between the joint body and the pipe. We aim to provide pipe fittings for this purpose.

The structure of this invention will be explained below according to the embodiment shown in FIGS. 2 to 4.

FIG. 2 is a drawing showing the overall configuration of the pipe joint according to this invention, in which 11 is the joint body, 12 is an 01J ring with a slightly larger diameter than the pipe outer diameter, and 13 is a synthetic resin or disc spring-like (metal) )
14 is a collet, 15 is a cap nut, and 16 is a pipe.

The joint body 11 includes a first step 11 for inserting and positioning a pipe on the inner diameter side, a second step 18 for inserting an 01J ring 12 and a backup ring 13 that exceed the pipe diameter, and a second step 18 for inserting and positioning a pipe on the inner diameter side. a stopper 19 for preventing the 01J ring and backup ring from coming off, which is provided at the opening end of the section;
It has a thread part 20 on the outer diameter side that is screwed into the thread part of the cap nut.

The collet 14 passes through the lower end of a stopper 19 provided on the joint body 11 at its tip and presses the O-ring 12 in the axial direction via the backup ring 13, thereby deforming the O-ring 12 up and down in the radial direction. It has a pushing part 21 that is shaped like a cylindrical part, a plurality of grooves 22 on its inner diameter, and a tapered surface 23 on its outer diameter.

The cap nut 15 has a tapered pressing surface 24 on the inner diameter side for pressing a tapered surface 23 of the outer diameter of the collet in the radial and axial directions and moving it forward in the axial direction, and a thread part 20 of the joint body 11.
It has a threaded portion 25 that is screwed together.

In the above structure, first, the O-ring 12 and the backup ring 13 are inserted into the second step portion 18 of the joint body 11 while reducing their diameter, and the collet 14 and the cap nut 15 are assembled and integrated in advance.

Next, the tip of the pipe 16 is inserted into the first step 17 of the joint body 11 until it reaches the bottom of the hole.

When the cap nut 15 is tightened after inserting the pipe, the collet 14
moves forward by being pushed by a tapered pressing surface 24 that engages with a tapered surface 23 of the outer diameter, and the pressing portion 21 at the tip of the collet 14 is a stopper 19 provided at the open end of the second step portion 18 of the joint body 11. push the backup ring 13 inserted into the second stepped portion 18 through the lower surface of the 0-ring 12 through the backup ring 13,
The bottom of the second step 18 of the joint body 11 (side surface on the body side) and the backup ring 13 sandwich the ring 12 and crush it radially up and down, and the joint body 11 and the pipe 1 are separated.
Seal the space between 6 and 6.

When the collet 14 moves further forward, when the A part of the collet hits the outer end surface of the stopper 19 of the joint body, the collet is prevented from moving forward and contracts in the inner diameter direction, and the grooves 22 bite into the pipe 16 and are fixed.

As explained above, this invention has a first step part for inserting and positioning the pipe on the inner diameter side, and a second step part for inserting a sealing material such as an 01J ring or a square ring and a backup ring. a joint body having a stopper protruding radially inward at the open end of the second step portion and a thread portion on the outer diameter side; The 01J ring and backup ring whose inner diameter is larger than the outer diameter of the pipe and whose outer diameter is larger than the inner diameter of the swivel and the inner diameter of the pipe are inserted between the stopper and the outer surface of the pipe. , a collet with a push part for suppressing and deforming sealing materials such as O-rings and square rings via a backup ring, and a collet with a plurality of grooves on the inner diameter and a tapered outer diameter, and a collet on the inner diameter side. Since it has a flange portion having a tapered pressing surface that engages with the tapered surface of the collet, and a cap nut that has a threaded portion that engages with the threaded portion of the joint body, it is possible to Q IJ song groove O on the fitting body
Since it can be temporarily assembled by attaching the ring and backup ring, it is only separated into three parts: the joint body, the collet, and the cap nut, which substantially reduces the number of parts and makes handling extremely easy.

Also, the larger the OIJ song crushing allowance when inserting the conventional pipe (the smaller the diameter of the OIJ song used), the more the OIJ song is inserted.
This damage can be prevented by using a Q IJ song with a larger diameter than the pipe diameter, without having to process the tip of the pipe such as chamfering.

Furthermore, the 0 ring passes through the main body (the bottom surface of the stopper) and is pressed by the pushing part of the collet that enters through the backup ring, so it is crushed and deformed)
Since this can be done completely and a large crushing margin can be set, the seal will be perfect.

[Brief explanation of drawings]

FIG. 1 is a drawing showing a conventional example. Fig. 2 is a diagram showing the overall configuration of this device, Fig. 3 is an enlarged drawing showing the state before the pipe is inserted, and Fig. 4 is a drawing showing the state after tightening. 12...O-ring, 13...
Backup ring, 14...collet, 15...
Bag nut, 16...pipe, 17...first step,
18... Second step portion, 19... Stopper, 21...
・Oshibe.

Claims (1)

[Scope of utility model registration request] It has a first step part for inserting and positioning a pipe on the inner diameter side, and a second step part for inserting a sealing material such as an 01J ring or a square ring, and a backup ring, and an opening in the second step part. A joint body having a stopper projecting radially inward at the end and a cotton thread portion on the outer diameter side, and the inner diameter of which is inserted into the second step of the joint body while being reduced in diameter is a pipe. 0 whose diameter is larger than the outer diameter and the outer diameter is larger than the inner diameter of the stopper.
A push part is provided between the 1J ring and the backup ring, and the stopper and the outer surface of the pipe to suppress and deform the sealing material such as the 01J ring and the square ring through the backup ring, and a plurality of push parts are provided on the inner diameter. A corella P having grooves and a tapered outer diameter, and a flange portion having a tapered suppressing surface that engages with the tapered surface of the collet on the inner diameter side, and a cotton thread portion of the joint body. A pipe joint consisting of a cap nut and a cap nut having a threaded portion to be screwed together.