JPH0738795Y2 - Resin pipe joint - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention forms a resin pipe insertion connection cylindrical portion into which a resin pipe to be connected is externally fitted in a joint body, and an outer peripheral portion of the cylindrical portion. A projection for preventing the resin pipe from slipping out, and by fitting the resin pipe into the peripheral portion of the cylindrical portion insertion portion of the resin pipe by sliding while being fitted onto the resin pipe. The present invention relates to a joint for a resin pipe provided with a tightening sleeve that presses against the outer peripheral surface to prevent it from coming off.

[Conventional technology]

Conventionally, in the resin pipe joint as described above, as shown in FIGS. 5 (a) and 5 (b), the fitting sleeve of the tightening sleeve (6) causes sliding of the tubular portion of the resin pipe (5). The structure is such that the inner peripheral surface of the tightening sleeve (6) is brought into sliding contact with the outer peripheral surface in a pressure contact state (Japanese Utility Model Application No. 62-1).
70205 publication).

[Problems to be solved by the device]

However, in the above-described conventional structure, the resin pipe (5) that is inserted into the tubular portion (4) in an outer fitting shape is unnecessarily fed to the inner side as the tightening sleeve (6) is fitted and slid. Then, the resin pipe (5) whose tip touches the joint body (3)
The tip end of the clamp bends and swells as shown by the chain line in FIG. 5 (a), and the bulge portion intervenes between the joint body (3) and the tip of the tightening sleeve (6), so that the tightening is performed. The sleeve (6) could not be fitted completely to a predetermined depth position, resulting in incomplete connection.

An object of the present invention is to suppress the above problems by a simple improvement.

[Means for Solving the Problems]

The characteristic configuration of the resin pipe joint according to the present invention is to form a resin pipe insertion connection cylindrical portion into which the resin pipe to be connected is externally fitted in the joint body, and to prevent the resin pipe from being pulled out at the outer peripheral portion of the cylindrical portion. A protrusion is provided, and the resin pipe is inserted between the resin pipe and the outer peripheral surface of the cylindrical portion by being fitted to the peripheral portion of the cylindrical portion insertion portion of the resin pipe by sliding in a state of being fitted onto the resin pipe. In a configuration in which a tightening sleeve that presses and holds is provided, in a state where the tightening sleeve is externally fitted to a cylindrical portion insertion portion of the resin pipe, a sliding contact sliding surface with respect to an inner circumferential surface of the tightening sleeve with respect to fitting sliding of the tightening sleeve. And a retainer formed of a member that can be deformed to reduce its diameter, is provided in a state of straddling the protrusion in the axial direction of the cylindrical portion, and the inner peripheral surface of the tightening sleeve is Refit before fitting the attached sleeve A smaller diameter than the outer diameter of the inner diameter of the retainer, and the outer diameter of the outer diameter of the outer diameter of the retainer, and an outer diameter of the outer diameter of the outer diameter of the retainer, and a front end side of the outer diameter of the equal diameter portion. And the taper portion whose inner diameter gradually increases toward the tip side, and the action and effect are as follows.

[Action]

That is, if the retainer as described above is provided, the inserted resin pipe is fed to the back side as the tightening sleeve is fitted and slid, which forms the inner peripheral surface of the tightening sleeve and the sliding contact sliding surface against it. It is effectively suppressed by the sliding contact with the retainer.

With the fitting slide of the tightening sleeve, the cylindrical part insertion part of the resin pipe and the retainer fitted on the resin pipe are pressed between the inner peripheral surface of the tightening sleeve and the outer peripheral surface of the cylindrical part. In this case, when the equal-diameter portion of the inner peripheral surface of the tightening sleeve is stronger than the taper portion, and the equal-diameter portion straddles the projection in the axial direction of the tubular portion in the axial direction. Squeeze.

Then, the tubular portion insertion portion of the resin pipe and the retainer externally fitted to the resin pipe are integrally deformed along the inner peripheral surface of the tightening sleeve, and in the deformed shape, they are pressed by the taper portion. The outer diameter of the portion is larger than the outer diameter of the portion pressed by the equal-diameter portion. Further, the resin pipe is deformed along the protrusion in a state of straddling the protrusion in the axial front-rear direction, and the deformed portion and the protrusion are engaged with each other.

Therefore, the outer diameter of the portion pressed by the taper portion is larger than the outer diameter of the portion pressed by the equal-diameter portion, and the resin pipe straddles the projection in the axial center direction. With the cooperation of the deformation along the protrusion and the engagement of the deformed portion and the protrusion, the retaining action of the resin pipe can be effectively exerted.

Also, mainly due to the equal diameter portion of the inner peripheral surface of the tightening sleeve,
Since the cylindrical part of the resin pipe and the retainer fitted on the resin pipe are pressed together, the force of the tightening sleeve trying to come off is small, so the tightening sleeve is inserted against the force. The holding force for holding in this state is small, and the structure for retaining the tightening sleeve is simple.

[Effect of device]

As a result, it is possible to effectively prevent the bulging of the resin pipe tip that may be present between the joint body and the tip of the tightening sleeve,
The tightening sleeve can be securely and easily fitted to the predetermined back position, and moreover, with a simple structure, it is possible to more reliably prevent the resin pipe from being pulled out. As a result, it was possible to obtain a joint for resin pipes that was even better in terms of connection function.

〔Example〕

 Next, examples will be described.

As shown in FIGS. 1 (a), (b), and FIG. 2, the other end of the metallic joint body (3) having a male thread (2) for connection to the other tubing (1) formed on one end side. A tubular portion (4) for connecting a resin pipe is formed in the portion, the inner hole communicating with the joint flow channel (f).

The cylindrical portion (4) has an outer peripheral surface as a contact sealing surface for the inner peripheral surface of the resin pipe (5).

On the other hand, separately from the joint body (3), a metal tightening sleeve (6) which is slidably fitted on the resin pipe (5) is provided, and the metal pipe is fitted on the resin pipe (5). The sleeve (6) is slid as shown in the order of (a) and (b) of FIG. 1 to fit (press-fit) into the peripheral portion of the tubular portion insertion portion of the resin pipe (5), whereby the resin pipe (5) The portion inserted into the tubular portion (4) is strongly pressed against the outer peripheral surface of the tubular portion (4) over its entire circumference, so that the resin pipe (5) is prevented from being pulled out, and so on. With a sufficient pressure, a uniform and large contact seal surface pressure is generated in the circumferential direction between the outer peripheral surface of the cylindrical portion (4), which is the sealing surface, and the inner peripheral surface of the insertion resin pipe (5), to ensure a reliable seal. It's done.

On the outer peripheral surface of the cylindrical portion (4), there is provided an annular projection (7) for preventing the resin pipe from coming off, which is to be bitten into the inner peripheral surface of the resin pipe (5) when the tightening sleeve (6) is fitted. Are formed in a plurality of steps, so that the resin tube (5) is prevented from coming off more reliably by the biting of these annular projections (7).
Further, the joint body (3) is formed with an annular groove (9) into which the distal end of the resin pipe (5) is inserted, and further, between the joint body (3) and the tightening sleeve (6). Forms engaging portions (10a), (10b) that automatically engage with the sliding movement of the tightening sleeve (6) when the fitting is completed and prevent the tightening sleeve (6) from coming off. There is.

Between the fitted tightening sleeve (6) and the cylindrical part insertion part of the resin pipe (5), the external condition of the tightening sleeve (6) is fitted to the cylindrical part insert part of the resin pipe (5). A metal retainer (8) having an outer peripheral surface (8a) as a sliding contact sliding surface with respect to the inner peripheral surface of the tightening sleeve is interposed for fitting and sliding, and a resin inserted in the tubular portion (4). To prevent the pipe (5) from being unnecessarily fed inward as the tightening sleeve (6) is fitted and slid, the inner peripheral surface of the tightening sleeve (6) and the sliding contact sliding surface (8a) against it This is prevented by the sliding contact with the retainer (8) to be formed.

That is, since the resin pipe (5) externally fitted into the tubular portion (4) is unnecessarily fed to the inner side as the tightening sleeve (6) is fitted and slid, the tip end is joined. Since the tip end of the resin pipe (5) contacting the main body (3) bends and swells, and the bulging portion intervenes between the joint main body (3) and the tip of the tightening sleeve (6), tightening is performed. In the situation where the sleeve (6) cannot be completely fitted to a predetermined depth position, the retainer (8) as described above is provided.
To prevent the tightening sleeve (6) from being securely and easily fitted to a predetermined depth position.

In addition, the tip of the retainer (8) contacts the joint body (3) in the annular groove (9).

The retainer (8) and the tightening sleeve (6) will be further described.

The retainer (8) is made of a member that can be deformed by reducing its diameter, and
The retainer (8) is provided so as to straddle the annular projection (7) in the axial front-back direction of the tubular portion (4). The inner circumferential surface of the tightening sleeve has a smaller diameter than the outer diameter of the retainer (8) before the fitting of the tightening sleeve (6) and is fitted onto the retainer (8) with respect to the annular projection (7). And an equal-diameter portion having a length that extends in the axial front-rear direction,
The taper portion is connected to the tip end side of the equal diameter portion and the inner diameter gradually increases toward the entire end side. As the tightening sleeve (6) is fitted and slid, the cylindrical part insertion portion of the resin pipe (5) and the resin between the inner peripheral surface of the tightening sleeve (6) and the outer peripheral surface of the cylindrical part (4). The retainer (8) externally fitted to the pipe (5) is pressed, but in that case, the equal-diameter portion of the inner peripheral surface of the tightening sleeve (6) is stronger than the taper portion, and the equal-diameter portion is equal in diameter. By the portion, the annular projection (7) is squeezed across the front and rear in the axial direction.

Then, the tubular portion insertion portion of the resin pipe (5) and the retainer (8) externally fitted to the resin pipe (5) are integrally deformed along the inner peripheral surface of the tightening sleeve (6), and the deformation In such a shape, the outer diameter of the portion pressed by the tapered portion is larger than the outer diameter of the portion pressed by the equal-diameter portion. Further, the resin pipe (5) is deformed along the annular protrusion (7) while straddling the annular protrusion (7) in the axial front-back direction, and the deformed portion and the annular protrusion (7) are engaged. It will be in a combined state.

Therefore, the outer diameter of the portion pressed by the tapered portion is larger than the outer diameter of the portion pressed by the equal-diameter portion, and the resin pipe (5) has the axial core with respect to the annular protrusion (7). The resin pipe (5) is effectively cooperated by the deformation along the annular projection (7) in a state of straddling the front and rear in the direction and the engagement of the deformed portion and the annular projection (7). It is possible to have a retaining effect.

In addition, mainly by the equal-diameter portion of the inner peripheral surface of the tightening sleeve (6), the cylindrical portion insertion portion of the resin pipe (5) and the retainer (8) externally fitted to the resin pipe (5) are compressed. Since the tightening sleeve (6) tends to come off with a small force, the holding force for holding the tightening sleeve (6) in the fitted state against the force is small,
The structure for retaining the tightening sleeve (6) can be a simple structure such as the engaging portions (10a) and (10b).

As shown in FIGS. 2 and 3 (a) and (b), the retainer (8) expands in a state of being fitted onto the tubular portion insertion portion of the resin pipe (5), and its circumference. It has a split cylinder structure in which the diameter of the resin pipe (5) is reduced in a state of being compressed and deformed when the tightening sleeve (6) is fitted into the portion. Even if there is some dimensional error in the retainer (8)
By reducing the diameter, the cylindrical portion insertion portion of the resin pipe (5) is strongly and surely tightened to make the seal and the retaining member more reliable. In other words, the tolerance of the wall thickness and the inner diameter of the resin pipe (5) can be made large.

Further, the retainer (8) is interposed between the tubular portion inserting portion of the resin pipe (5) and the fitted tightening sleeve (6) in a state having internal stress toward the diameter reducing side. Even if the resin pipe (5) that is pressed between the tubular portion (4) and the retainer (8) undergoes creep deformation over a long period of time, internal stress to the diameter reducing side causes The elastic tightening force of the retainer (8) can keep the sealing effect and the retaining effect high.

[Another embodiment]

 Next, another embodiment will be listed.

(A) The specific shapes and structures of the joint body (3), the tubular portion (4), the tightening sleeve (6), and the retainer (8) can be variously improved, and the materials thereof are also respectively. , Various materials can be applied.

(B) When the retainer (8) has a split cylinder structure, various improvements can be made to the split form. For example, the split cylinder structure shown in FIG. 4 may be used.

(C) The resin pipe to be connected may be any resin pipe such as a cross-linked poly pipe and a polybutene pipe, and the fluid to be circulated does not matter.

It should be noted that reference symbols are added to the claims of the utility model for convenience of comparison with the drawings, but the present invention is not limited to the structure of the attached portion by the entry.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention, FIGS. 1 (a) and 1 (b) are sectional views showing a connection operation state and a connection completed state, and FIG. 2 is an exploded perspective view. Figure 3 (a),
(B) is sectional drawing which shows the expansion / contraction form of a retainer. Fourth
The drawing is a perspective view showing another embodiment of the present invention. 5 (a) and 5 (b) are cross-sectional views showing a connection operation state and a connection completed state in the conventional structure. (3) …… Coupling body, (4) …… Cylinder part, (5) …… Resin pipe, (6) …… Tightening sleeve, (7) …… Protrusion, (8)
…… Retainer, (8a) …… Sliding contact sliding surface.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Hiroshi Kaneda, 5-1, Hirano-cho, Higashi-ku, Osaka, Osaka Prefecture, Osaka, Osaka (72) Inventor, Nagaharu Ikuta 1-27, Motomiya-cho, Minato-ku, Aichi Toyo Fitting Co., Ltd. (56) Bibliography Sho 57-175676 (JP, U) Japanese Patent Sho 46-13056 (JP, B1) Japanese Official Sho 56-6715 (JP, Y2) Japanese Official Sho 55-48957 ( JP, Y2)

Claims (3)

[Scope of utility model registration request] 1. A resin pipe (5) to be connected to a joint body (3)
(4) Cylindrical part for resin tube insertion connection that inserts externally
And a protrusion (7) for preventing the resin pipe from being pulled out is provided on the outer peripheral portion of the tubular portion (4), and the resin pipe (5) is slidably fitted onto the resin pipe (5). ) A resin provided with a tightening sleeve (6) for preventing the resin pipe (5) from being pulled out from the outer peripheral surface of the tubular portion (4) by being fitted into the peripheral portion of the tubular portion insertion portion of the resin. A fitting for pipes, which is slidably in contact with the inner circumferential surface of the tightening sleeve (6) with respect to the fitting sliding of the tightening sleeve (6) in a state of being externally fitted to the tubular portion insertion portion of the resin pipe (5). 8a) is formed, and a retainer (8) formed by a member that can be reduced in diameter is provided in a state of straddling the projection (7) in the axial front and rear direction of the tubular portion (4), The inner peripheral surface of the tightening sleeve is set to be smaller than the outer diameter of the retainer (8) before the fitting of the tightening sleeve (6). With a very small diameter,
Further, in a state of being fitted onto the retainer (8), the equal-diameter portion having a length that extends across the projection (7) in the axial direction front and back, and is connected to the tip end side of the equal-diameter portion. A resin pipe joint consisting of a taper part where the inner diameter gradually increases toward the tip side. 2. A joint for a resin pipe according to claim 1, wherein the retainer (8) has a split tube structure in which a diameter thereof is reduced by fitting the tightening sleeve (6) into a peripheral portion thereof. 3. The retainer (8) is interposed between the tubular portion insertion portion of the resin pipe (5) and the tightening sleeve (6) in a state having internal stress toward the diameter reducing side. The joint for resin pipe according to claim 2.