JPH08170768A - Pipe joint - Google Patents

Abstract

PURPOSE: To prevent a sleeve body from being jointly rotated when a tightening nut body is tightened by the deformation of the sleeve body fitted to a pipe to be connected due to the tight pressing of a tapered wall surface of the body and a slidable ring body internally fitted to the tightening nut body to seal the outer circumferential surface of the pipe to be connected. CONSTITUTION: A sleeve body 3 is fitted to a pipe 4 to be connected, and housed over the pipe 4 to be connected and an inner cylindrical part 14 of a body 1. When a tightening nut body 2 is screwed to be tightened to a stopper (wrench receiving part) 11 of the body 1, the sleeve body 3 is deformed due to the tight pressing of each tapered wall surface of the inner circumference of the tightening nut body 2. This deformation is made so as to realize the deflection of the desired mode by setting the condition of the plastic deformation with the side end part of a joint body 1 to be same even when the friction heat is generated on the side end part of a nut body 21 of the sleeve body 3 due to the difference in the wall thickness of the sleeve body 3 and the difference in the taper angle. The outer circumferential surface of the pipe 4 to be connected is tightly pressed at each end of the sleeve body 3 to realize the sealing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint used for metal piping of various facilities such as gas, air conditioning, hydraulic pressure, hot water supply and the like.

[0002]

2. Description of the Related Art As a pipe connecting means for metal pipes of various facilities,
Although methods such as welding and connection to the pipe itself by forming screws are used, when the above-mentioned means cannot be adopted due to various factors such as the situation at the work site, the wall thickness of the pipe, the material, etc. A pipe joint that does not need to be processed is used.

As the pipe joint, one disclosed in Japanese Utility Model Publication No. 61-26705 previously proposed by the inventor of the present application is known. This pipe joint, as illustrated in FIG.
Joint body 01, tightening nut body 02, sleeve body 03
It consists of

The joint main body 01 is formed by engraving a screw on the outer peripheral surface on the opening end side and forming a taper wall surface that expands outward on the inner peripheral surface, and in particular, it is connected to the back side end of the taper wall. An annular groove (short inner cylinder) of the pipe is provided.

Further, the tightening nut body 02 has a threaded portion which is screwed to the outside of the opening end of the joint body and a taper wall surface on the inner peripheral surface, and the taper wall surface is opposed to the taper wall surface of the joint body 01. In addition, the taper angle is formed larger than the taper angle of the taper wall surface of the joint body 01. Further, the sleeve body has a size to be externally inserted into the connected pipe 04, and has a thin wall thickness on the joint body 01 side and a thick wall thickness on the other end.

In the pipe joint, the sleeve body 03 is covered on the connection pipe 04, the connection pipe 04 is inserted into the main body 01, the tip thereof is fitted in the annular groove, and the tightening nut body 02 is screwed onto the main body 01. Joint tightening, the sleeve body 03 is deformed by close contact with each taper wall surface, and the outer peripheral surface of the connected pipe 04 inserted into the joint body 01 is closely pressed at both ends of the sleeve body 03 to realize sealing. Is.

[0007]

The above-mentioned conventional pipe joint realizes sealing by bending deformation of the sleeve body 03, but when tightening the tightening nut body 02,
The tightening nut body 02 and the sleeve body 03 may rotate together due to the frictional resistance between them. Sleeve body 03
When the sliding rotation of the connected pipe 04 occurs on the peripheral surface of the connected pipe 04, the seal of the connecting portion may be broken, and gas leakage may occur from the location. Also, when the connected pipe 04 rotates together with the sleeve body 03, This causes inconveniences such as loosening of the connection portion between the other end of the connection pipe 04 and another device or another connection pipe. Therefore, the present invention proposes an improvement provided with a measure to prevent the sleeve body from rotating together when tightening the tightening nut body.

[0008]

The pipe joint according to the present invention comprises:
The joint body formed on the inner peripheral surface with a tapered wall surface, the tightening nut body with the taper wall surface facing the tapered wall surface of the joint body, and each taper wall surface when the joint body and the tightening nut body are screwed together. It is deformed by the close contact with
In a pipe joint composed of a sleeve body that performs sealing by tightly pressing the outer peripheral surface of the connected pipe inserted into the joint body at both ends, the inner peripheral surface portion of the tightening nut that abuts the sleeve body, It is characterized by being formed of a sliding ring body.

[0009]

[Operation] When the sleeve body is attached to the pipe to be connected, the pipe to be connected is externally inserted into the inner cylinder of the main body, and the tightening nut body is screwed and tightened to the main body, the sleeve body forms the taper wall surface of the main body and the tightening nut body. It is deformed by the close contact pressing of the sliding ring body installed inside, and the outer peripheral surface of the connected pipe is closely pressed at both ends of the sleeve body to realize sealing. The tightening rotation of the tightening nut body is not transmitted to the sleeve body due to the interposition of the sliding ring body, and there is no fear that the sleeve body will rotate together.

[0010]

EXAMPLES Next, examples of the present invention will be described. The pipe joint according to the present embodiment has a basic structure similar to that of the conventional pipe joint, and includes a joint body 1, a tightening nut body 2, and a sleeve body 3.

The joint body 1 is formed with connecting portions on the left and right with a wrench receiving portion (stopper) 11 having a hexagonal cross section as a center, and a flow passage portion 12 penetrating the inside thereof is provided and an inner peripheral surface of the opening end thereof. A tapered wall surface 13 that expands outward is formed, and an inner cylinder portion 14 that greatly protrudes the opening end from the back end of the tapered wall surface 13 is provided. A screw portion 15 is formed on the outer peripheral surface on the opening end side. Formed.

Further, in particular, the inner cylindrical portion 14 does not have a cylindrical shape having the same outer diameter, but a step is formed between the base portion (main body side) and the tip end side (nut side). The tightening nut body 2 is formed on the inner peripheral surface of the hexagonal nut main body 21 by forming a female screw portion 22 that is screwed into the screw portion 15 of the joint main body 1, a taper wall surface 23, and an end edge side of the taper wall surface 23. With a moving ring body 24,
The female screw portion 22 is formed to have a length such that it can collide with the wrench receiving portion 11 of the joint body 1, and the sliding ring body 24 is located at a predetermined position in the colliding state.

The sliding ring body 24 is provided with an abutment surface a which comes into contact with an end edge portion of the sleeve body 3 which will be described later, and an oil or the like is easily interposed between the sliding ring body 24 and the main body side of the nut body 2 to facilitate the operation. It is designed to be slidable. The taper angle of the taper wall surface 23 including the sliding ring body 24 is formed larger than the taper angle of the taper wall surface 13 of the joint body 1.

The sleeve body 3 is sized to be fitted over the connected tube 4 which is tightly fitted in the inner cylinder portion 14, and the wall thickness thereof is not uniform and is thin on one end side and gradually increases toward the other end side. It was done.

Thus, the pipe joint of the above-mentioned embodiment is the connected pipe 4
The sleeve body 3 is covered with the sleeve body 3, the connected pipe 4 is externally inserted into the inner cylinder portion 14 of the main body 1, and the tightening nut body 2 is screwed and tightened to the stopper (wrench receiving portion) 11 of the main body 1. Is deformed by close contact with the tapered wall surfaces 13 and 23 (contact surface a).

Like the conventional pipe joint, the deformation of the sleeve body 3 is caused by the difference in wall thickness of the sleeve body 3 and the difference in taper angle even if friction heat is generated at the end of the sleeve body 3 on the nut body side. The conditions of plastic deformation with the end portion on the joint body side are set to be the same and the joint body body is bent into a desired shape, and the outer peripheral surface of the connected pipe 4 is closely pressed by both ends of the sleeve body 3. Therefore, sealing is realized by the flexural deformation of the sleeve body.

In particular, according to the present invention, the portion of the tightening nut body 2 that contacts the sleeve body 3 is formed by the sliding ring body 24. Therefore, when the tightening nut body 2 is tightened and rotated, it is added to the sleeve body 3. The transmission of force in the rotating direction is reduced,
The sleeve body 3 does not rotate. Therefore, the seal of the connecting portion is broken to cause gas leakage, and the connected pipe 4 rotates together with the sleeve body 3 to loosen the connecting portion with the other device or the other connecting pipe on the other end side. It will be prevented.

The relationship between the tapered wall surface 23 and the contact surface a of the sliding ring body 24 may be such that the contact surface a has all the functions of the tapered wall surface 23, but at least the co-rotation of the sleeve body 3 As long as the frictional resistance is reduced so as not to occur, it is sufficient if it constitutes a part thereof.

The present invention is not limited to the above-mentioned embodiment, and the stopper formed on the joint body 1 may be formed separately without being used also as the wrench receiving portion, and the inner cylinder portion is independent from the body 1. The inner cylinder member may be used, or it may not be provided.

[0020]

As described above, according to the present invention, a joint body having an inner peripheral surface as a tapered wall surface, a tightening nut body having opposing tapered wall surfaces, and a connecting pipe which is deformed by close contact pressing by each tapered wall surface. In a pipe joint composed of a sleeve body for sealing by closely pressing the outer peripheral surface of, the part of the tightening nut body that abuts the sleeve body is formed by a sliding ring body. This prevents various inconveniences due to the co-rotation of the sleeve body that tends to occur when tightening the body, and also has the advantage of reducing the tightening torque of the nut.

[Brief description of drawings]

FIG. 1 is an overall external view of an embodiment of the present invention.

FIG. 2 is a sectional view of each member.

FIG. 3 is a cross-sectional view of main parts in the same connected state.

FIG. 4 is an explanatory view of the sliding ring body.

FIG. 5 is a sectional view of a main part of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Joint main body 11 Wrench receiving part (stopper) 12 Flow path part 13 Tapered wall surface 14 Inner cylinder part 15 Screw part 2 Tightening nut body 21 Nut main body 22 Female screw part 23 Tapered wall surface 24 Sliding ring body 3 Sleeve body

Claims (1)

[Claims] 1. A joint main body formed with a tapered wall surface that expands the inner peripheral surface of the opening end portion to the outside, a screw portion screwed onto the inner peripheral surface outside the opening end portion of the joint main body, and a tapered wall surface of the joint main body. When the tightening nut body that forms a taper wall surface facing each other and the joint body and the tightening nut body are screwed together, they are deformed by the close contact pressing of each taper wall surface and are inserted into the joint body at both ends. In a pipe joint constituted by a sleeve body for closely pressing the outer peripheral surface of the connected pipe, the inner peripheral surface portion of the tightening nut that abuts the sleeve body is formed by a sliding ring body. Pipe fittings.