JP2001141155A - Pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe joint which is excellent in assembling workability, easy in control and acquisition of parts, and less in possibility of losing parts. SOLUTION: This pipe joint comprises a joint body 2 having an insertion cylindrical part 6 to be inserted in an end of a pipe for connection, a split ring 3 having a slit 15 and to be housed over the end of the pipe housed over the insertion cylindrical part 6 of the joint body 2, a sleeve which is housed over the split ring 3, pressed in the axial direction to contract the split ring 3 through the contact movement of tapered surfaces with each other, and to press and lock the end of the pipe to the insertion cylindrical part 6, and in a non-service condition, the split ring 3 and the sleeve 4 are assembled with the joint body 2 and the split ring 3, respectively in a non-separate condition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a pipe joint.

[0002]

2. Description of the Related Art Conventionally, a pipe joint for connecting a pipe for water supply or hot water supply made of a synthetic resin material, for example, as shown in FIG. A joint body c having an insertion cylindrical portion b formed with a plurality of stages of circumferential taper (bamboo shoot shape), a split ring e having a split d, and a sleeve f for reducing the diameter of the split ring e. Was used.

In such a pipe joint, first, pipe a
A sleeve f and a split ring e are mounted in order, the pipe is pushed into the insertion tube portion b of the joint body c, and the split ring e is set at a predetermined position. By reducing the diameter of e, the pipe a is hung on the insertion tube part b of the joint main body c in a state where it cannot be removed.

[0004]

However, since the conventional pipe joint is composed of three parts, the parts management is complicated.
Especially when many fittings are needed,
It is not easy to arrange these parts without excess or shortage, and there is also a problem that the parts are easily lost. Moreover,
The assembling work takes three steps and is troublesome,
Efficiency did not improve.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a pipe joint which has good assembling workability, can easily manage and procure parts, and has little risk of losing parts.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a joint body having an insertion cylindrical portion inserted into an end of a pipe to be connected, and a joint body having a slit. A split ring that is externally fitted to the end of the pipe that is externally fitted to the insertion tube portion of the main body, and is externally fitted to the split ring and pushed in the axial direction, so that the contact movement between the tapered surfaces causes
A sleeve for reducing the diameter of the split ring so as to crimp or hook the end of the pipe to the insertion tube, wherein the split ring is attached to the joint body and the sleeve is attached to the split body when not in use. The rings are assembled so as not to be separated from each other.

[0007] It is also preferable that a concave peripheral groove is formed on the outer peripheral surface of the insertion tube portion, and a seal member for closely contacting the inner surface of the end of the pipe is fitted in the concave peripheral groove.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A pipe joint according to the present invention will be described below in detail with reference to the drawings showing an embodiment.

FIG. 1 is a cross-sectional view showing an embodiment of a pipe joint C, FIGS. 2 to 4 are cross-sectional views for explaining the procedure of connection work, and FIG. 5 is an external view of a state in which pipes are connected. FIG. In these figures, reference numeral 1 denotes a pipe made of a synthetic resin material such as cross-linked polyethylene or polybutene, 2 denotes a joint body, 3 denotes a split ring, and 4 denotes a sleeve. In a state (before connection), the split ring 3 is attached to the joint body 2 and the sleeve 4 is attached to the split ring 3.
And are assembled in a state where they are not separated.

The above-mentioned joint body 2 is formed at one end thereof with an insertion tube portion 6 having a plurality of steps of circumferential taper for fitting and hooking the pipe 1 in a retaining state, and formed at a base portion thereof. O-ring 8 as a sealing member
And a ring groove-shaped circumferential recess 9 for fitting an end of the pipe 1 is formed on the inner side thereof, and a flange portion protruding from the outer circumferential side of the circumferential recess 9 is formed. Ten
Is formed with a peripheral groove 11 for engaging the split ring 3. Further, on the other end side, a male screw 12 screwed to a member (not shown) to be connected is formed.

The split ring 3 has an axial slit 15 having a tapered first latching projection 16 formed at one end thereof, and a slit 15 formed at the other end thereof. A second latching projection 17 having a diameter slightly larger than the first latching projection 16 is formed, and a flange portion 18 formed in an outer convex shape outside the second latching projection 17.
Is formed inside, and when the pipe 1 is not connected, the inward circumferential projection 19 is loosely fitted to the circumferential groove 11 of the joint body 2 so as not to be separated (see FIG. 1).

The sleeve 4 is pushed into the inner peripheral side at one end thereof in the axial direction (the state where the pipe 1 is connected).
A first hooking concave portion 21 having a tapered shape that is tightly fitted to the first hooking convex portion 16 of the split ring 3 in a retaining state while being formed is formed.
On the other end inner circumference side, before connecting the pipe 1, split rings 3
(See FIG. 1) to the extent that they do not separate (see FIG. 1). When the pipe 1 is connected, the second latching projection 17 is tightly fitted in a tapered shape when it is locked. A second latching recess 22 is formed.

In the pipe joint C having such a configuration, before the pipe 1 is connected (initial state), as shown in FIG. Hook projection 16
The split ring 3 is
Due to its own resilience, the pipe 1 is in an expanded state in which the pipe 1 can be inserted (see FIG. 2). Therefore, the end of the pipe 1 to be connected can be pushed in the axial direction until the tip of the pipe 1 is brought into contact with the vertical wall 13 of the peripheral recess 9 against the insertion tube 6 of the joint body 2 ( (See FIG. 3). The insertion state of the pipe 1 can be confirmed from an insertion confirmation hole 20 (see FIG. 5) drilled on the side of the circumferential groove 11 of the joint main body 2. In addition,
The insertion confirmation holes 20 may be provided at, for example, three places at equal intervals.

Next, arms 32, 33 formed in a substantially U-shape or the like of the hydraulic tool 31 are engaged with the inside of the flange portion 10 of the joint body 2 and the outside of one end of the sleeve 4, respectively.
If the sleeve 4 is pushed in the axial direction by shortening the interval of 33, the split ring 3 is reduced in diameter by the contact movement between the tapered surfaces, and the end of the pipe 1 is crimped to the insertion tube portion 6. As the hooked state, the first hooking recess
21 can be hooked on the second hooking projection 17, and the second hooking recess 22 can be hooked on the first hooking projection 16, and the connection operation is completed.

In such a connection state, the end of the pipe 1 is hung on the insertion tube part 6 of the joint body 2 in a tight crimping state, and the O-ring 8 is pressed against the inner peripheral surface of the pipe 1. As a result, a high watertight state is formed, and the diameter of the split ring 3 is reduced.
And the split ring 3 and the sleeve 4 are integrated with the joint body 2 together with the pipe 1 in a firmly fixed state. In addition, the provision of the O-ring 8 can maintain excellent water stopping performance even when there is a dimensional change due to a variation in the diameter of the pipe 1 or thermal deformation. In addition,
The use of the hydraulic tool 31 allows the sleeve 4 to be pushed in strongly, so that the split ring 3 can be formed of a relatively thick material to increase the resilience and improve the connection strength.

When the pipe joint C is not used, the split ring 3 and the sleeve 4 are assembled to the joint main body 2 so as not to be separated from each other. Procurement on site is easy and reliable, and there is little risk of parts being lost. In addition, the connection work is performed by pushing the pipe 1 into the joint main body 2 and pushing the sleeve 4 by the hydraulic tool 31 without any skill, with extremely high workability, in a short time and efficiently. can do. The work of pushing the sleeve 4 in place of the hydraulic tool 31 may be performed by a manual clamping tool, although not shown, and various types of work may be employed.

[0017]

According to the first aspect, in the unused state,
Since the split ring 3 and the sleeve 4 are assembled to the joint main body 2 so as not to be separated from each other, the pipe connection operation can be performed easily and quickly. Also, parts management becomes easy, procurement at the site becomes easy and reliable, and the risk of parts being lost is reduced.

In the connected state, the split ring 3 is reduced in diameter by the sleeve 4 and the end of the pipe 1 is crimped or hooked to the insertion tube 6 of the joint body 2. It can be connected to the main body 2 in a retaining state. Further, since the split ring 3 and the sleeve 4 are integrated with the joint body 2 in a fitted state, a stable connection state of the pipe 1 is maintained.

According to the second aspect of the present invention, excellent water stopping performance can be maintained by the seal member 8 even if there is a dimensional change due to a variation in the diameter of the pipe 1 or thermal deformation.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part showing one embodiment of a pipe joint of the present invention.

FIG. 2 is a corresponding sectional view of a pipe joint and a pipe.

FIG. 3 is a cross-sectional view when a pipe is inserted.

FIG. 4 is a cross-sectional view when a pipe is connected.

FIG. 5 is an external view of a pipe connection part.

FIG. 6 is a view corresponding to assembly of a conventional pipe joint.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Piping 2 Joint main body 30 Split ring 4 Sleeve 6 Insertion cylinder part 7 Concave peripheral groove 8 Seal member 15 Slit C Pipe joint

Claims (2)

[Claims] 1. A joint body 2 having an insertion tube portion 6 inserted into an end of a pipe 1 to be connected, and said fitting member 2 having a slit 15 and being externally fitted to said insertion tube portion 6 of said joint body 2. The split ring 3 fitted externally to the end of the pipe 1 and the split ring 3 is externally fitted to the split ring 3 and pushed in in the axial direction, whereby the diameter of the split ring 3 is reduced by contact movement between the tapered surfaces. Piping 1
And a sleeve 4 for crimping or hooking the end of the sleeve to the insertion tube 6. In an unused state, the split ring 3 is mounted on the joint body 2, the sleeve 4 is mounted on the split ring 3,
A pipe joint characterized by being assembled so as not to be separated. 2. A concave groove 7 is formed on the outer peripheral surface of the insertion tube portion 6, and a seal member 8 is fitted into the concave groove 7 so as to be in close contact with the inner surface of the end of the pipe 1. The pipe joint according to claim 1.