JPH05141575A - Pipe joint - Google Patents

Abstract

PURPOSE:To eliminate welding and facilitate disassembly and re-assembly by butting a flange section of a pipe against a pipe joint member through an annular gasket, and meshing a sleeve fitted closely on the outer periphery of the pipe on the outer periphery of which a cap nut is closely fitted with a pipe joint member. CONSTITUTION:To assemble a pipe joint, first a thrust ring 26 and a cap nut 27 are fitted closely onto the outer periphery of a tubular section 25a of a sleeve 25, and they are fitted closely onto the outer periphery of the pipe 21, for example, from the left end. Next, the left end of the pipe 21 is enlarged in diameter to form a flange section 21a. Then a gasket 22 is fitted closely inside a cylindrical section 23 of a pipe joint member 20, and it is butted against the flange section 21a. Female threads 28 of the nut 27 are meshed with the male threads of the pipe joint member 20, and they are tightened. As a result, the pipe joint member 20 and the pipe 21 are connected securely to each other through the gasket 22. To disassemble the pipe joint, on the other hand, the nut 27 is loosened to separate it from the pipe join member 20 and move rightwards to the sleeve 25 and the pipe 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint.

[0002]

2. Description of the Related Art Conventionally, pipe joints shown in FIG. 3 and FIG. 4 have been known.

In FIG. 3, one end face of the first tubular joint member (1) and one end face of the second tubular joint member (2) are butted against each other with an annular gasket (3) sandwiched therebetween, and the second joint member (2). The second joint member (2) is fixed to the first joint member (1) by a bag-shaped nut (4) screwed to the first joint member (1) from the side. Then, the pipe (5) is inserted into the second joint member (2) from the other end side and fixed to the second joint member (2) at the welded portion (6).

In FIG. 4, a pipe (8) is inserted into the tubular joint member (7) from one end side, and two tightening sleeves (ferrules) are provided around the pipe (8) protruding from one end side of the joint member (7). ) (10) (11) are fitted, and the fitting member is installed from the pipe (8) side.
The sleeve (10) (11) is tightened by the bag-shaped nut (12) screwed to (7), and the pipe (8) is fixed to the joint member (7).

[0005]

In the case of the pipe joint of FIG. 3,
By loosening the nut (4), the first joint member (1) and the second joint member (2) can be displaced laterally orthogonal to the axis, so disassembly and assembly are easy, Welding is required.

In the case of the pipe joint of FIG. 4, welding is not necessary, but since the pipe (8) is inserted in the joint member (7), even if the nut (8) is loosened, the pipe (8) and the joint are not joined. The member (7) cannot be displaced laterally. For this reason, disassembly and assembly are very difficult when piping in a place with a small space, particularly when the pipe between two pipe joints is a short straight pipe.

The object of the present invention is to solve the above problems,
(EN) A pipe joint that does not require welding and is easy to disassemble and assemble.

[0008]

In the pipe joint according to the present invention, one end portion of the pipe is expanded to form an outward flange portion, and the end surface of the flange portion of the pipe and the one end surface of the tubular joint member are annular. A sleeve, which is abutted with a gasket in between and has an outward flange on the tubular joint member side of the tubular part, is fitted on the outer circumference of the pipe, and is fitted on the outer circumference of the tubular part of the sleeve so as to wrap the flange part of the sleeve. The sleeve and the tube are fixed to the tubular joint member by a bag-shaped nut fitted and screwed into the tubular joint member.

[0009]

[Function] Since one end of the pipe is expanded to form the outward flange portion, and the outward flange portion is formed on the tubular joint side portion of the sleeve fitted on the outer periphery of the pipe, the bag-shaped nut is used. The pipe can be directly connected to the tubular joint member by pushing the flange portion of the sleeve and the flange portion of the pipe toward the tubular joint member.

Since the end face of the flange portion at one end of the pipe and the one end face of the tubular joint member are butted against each other with the annular gasket sandwiched therebetween, when the nut is loosened, the tubular joint member and the pipe are moved laterally. You will be able to shift.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. In the following description, the left and right sides of the drawing will be referred to as left and right.

FIG. 1 shows a first embodiment.

In FIG. 1, the right end surface of the tubular joint member (20) and the left end surface of the pipe (21) are butted against each other with an annular gasket (22) interposed therebetween. The inner diameters of the joint member (20), the pipe (21) and the gasket (22) are substantially equal. Cylindrical part for preventing overtightening that protrudes to the right on the part near the outer periphery of the right end surface of the joint member (20)
(23) is formed, and the gasket (2
2) is fitted. The gasket (22) is, for example, a ring-shaped coil spring covered with a metal ring having a C-shaped cross section, and its outer diameter is slightly larger than the length in the left-right direction of the cylindrical portion (23) of the joint member (20). .. A male screw (24) is formed on the outer periphery of the portion of the joint member (20) near the right end. Tube (2
The outer diameter of 1) is smaller than the inner diameter of the cylindrical portion (24) of the joint member (20). The left end of the pipe (21) is expanded and the outward flange (2
1a) has been formed. The outer diameter of the flange part (21a) is slightly larger than the inner diameter of the cylindrical part (23) of the joint member (20), and the left end face of the flange part (21a) is slightly larger than the cylindrical part (23) of the joint member (20). It is pressed against the right end of the gasket (22) on the right side. A sleeve (25) is fitted around the outer circumference of the pipe (21) so as to be slidable and rotatable. The sleeve (25) includes a tubular portion (25a) and an outwardly facing flange portion (25b) integrally formed at the left end of the tubular portion (25a).
The left end face of (25b) is pressed against the right end face of the flange portion (20a) of the pipe (21). Flange portion (25b) of sleeve (25)
Has an outer diameter substantially equal to the outer diameter of the right end portion of the joint member (20).
A thrust ring (26) made of, for example, a thrust ball bearing is fitted on the outer periphery of the tubular portion (25a) of the sleeve (25), and further, the thrust ring (26) and the flange portion (25) of the sleeve (25).
b) Bag-shaped nut (union nut) to wrap around (27)
Is fitted. An inward flange (27a) is integrally formed on the right end of the nut (27).
Is the cylindrical part (2) of the right sleeve (25) of the thrust ring (26).
It is fitted on the outer circumference of 5a) so that it can slide and rotate. A female screw (28) is formed on the inner periphery on the left end side of the nut (27), and this is screwed into the male screw (24) of the joint member (20), so that the sleeve (25) and the pipe (21) are joined together. It is fixed at (20).

The pipe joint described above is assembled as follows.

First, the thrust ring (26) and the nut (27) are fitted on the outer periphery of the tubular portion (25a) of the sleeve (25), and these are attached to the outer periphery of the pipe (21) before forming the flange portion (21a). Insert from the left end. Then, the left end portion of the pipe (21) is expanded to form a flange portion (21a). The sleeve (25) or the like may be fitted from the right side to the pipe (21) having the flange portion (21a) formed at the left end. On the other hand, fit the gasket (22) inside the cylindrical part (23) of the joint member (20), and insert the pipe (2) into this gasket (22).
Butt the left end face of the flange (21a) of 1). And
Screw the female screw (28) of the nut (27) onto the male screw (24) of the joint member (20) and tighten it. Flange of nut (27)
(27a) hits the right end face of the thrust ring (26), thrust ring (26) hits the right end face of the flange part (25b) of the sleeve (25), and the flange part (25b) of the sleeve (25) touches the pipe (21).
The right end surface of the flange portion (21a) of each of them is prevented from moving to the left side. Therefore, by tightening the nut (27), the joint member (20) and pipe (21) will
It is firmly connected with (22) in between. Nuts like this (27)
In the state in which is tightened, the gasket (22) is compressed in the left-right direction, and its elastic force and the tightening force of the nut (27) are balanced. When the nut (27) is strongly tightened, the flange portion (21a) of the pipe (21) hits the cylindrical portion (23) of the joint member (20), and the nut (27) cannot be tightened any more. This prevents damage to the gasket (22) due to overtightening.

When the nut (27) is loosened and separated from the joint member (20) and moved to the right of the sleeve (25) and the pipe (21), the joint member (20) and the pipe (21) are laterally moved. It is possible to disassemble and easily disassemble and assemble.

In the above embodiment, in order to facilitate the rotation when tightening the nut (27), the nut (30) and the sleeve (2
The thrust ring (26) is provided between 5), but the flange portion (27a) of the nut (27) is directly attached to the flange portion (25b) of the sleeve (25) without providing such thrust ring. You may make it hit.

FIG. 2 shows a second embodiment, in which the same parts as those in the first embodiment are designated by the same reference numerals.

In the case of the second embodiment, the gasket (30) is held at the right end of the joint member (20) by the ring-shaped retainer (31). On the outer peripheral portion of the right end surface of the joint member (20), an annular overhanging portion (32) slightly overhanging on the right side is formed, and on the outside thereof, a left overhanging portion (31a formed on the left end portion of the retainer (31). ) Is stopped. The gasket (30) is a plate-shaped thin part (30a) with a thick part (30b) with an increased thickness in the left-right direction formed on the inner peripheral edge part.
0a) is the right end face of the overhang (32) of the joint member (20) and the retainer.
It is sandwiched and held between the inward protruding part (31b) formed at the right end of (31), and the left end of the thick part (30b) is pressed against the inner peripheral part of the end surface of the joint member (20). Has been made. And the pipe
The left end surface of the flange portion (21a) of (21) is pressed against the right end of the thick portion (30b) of the gasket (30). Others are first
This is similar to the case of the embodiment.

[0020]

As described above, according to the pipe joint of the present invention, by loosening the nut, the tubular joint member and the pipe can be laterally displaced from each other, which facilitates disassembly and assembly. Moreover, the pipe can be directly connected to the tubular joint member by the bag-shaped nut, and it is necessary to weld the pipe to the tubular joint member and connect the joint member to another tubular joint member as is conventionally done. There is no need for welding.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a pipe joint showing a first embodiment of the present invention.

FIG. 2 is a vertical sectional view of a pipe joint showing a second embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of a pipe joint showing a conventional example.

FIG. 4 is a vertical cross-sectional view of a pipe joint showing another conventional example.

[Explanation of symbols]

 (20) Tubular fitting member (21) Pipe (21a) Flange part (22) Gasket (25) Sleeve (25a) Cylindrical part (25b) Flange part (27) Nut (30) Gasket

Claims (1)

[Claims] Claim: What is claimed is: 1. One end of a pipe is expanded to form an outward flange portion, and the end face of the flange portion of the pipe and one end face of the tubular joint member are butted against each other with an annular gasket sandwiched between them. A sleeve having an outward flange portion formed on the tubular joint member side was fitted to the outer circumference of the pipe, fitted to the outer circumference of the tubular portion of the sleeve so as to wrap the flange portion of the sleeve, and screwed to the tubular joint member. A pipe joint in which a sleeve and a pipe are fixed to a tubular joint member by a bag-shaped nut.