JP2018151022A - Pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To hold water tightness of a connection portion as a resin pipe is surely connected to a pipe joint, even in a case where the resin pipe is connected to the pipe joint with abnormal insertion operation.SOLUTION: A pipe joint is configured such that between an inner cylinder where on an outer peripheral surface forming a connection port, a seal member is mounted, an outer cylinder arranged outside the cylinder, and a cap, provided is a pull-out prevention member holding an insertion guide for guiding a resin pipe and an end part of an inserted resin pipe at an insertion position. On a side of the insertion guide with which the end part of the resin pipe contacts, provided is separation prevention means of preventing separation between the insertion guide and the resin pipe. At the position where the resin pipe is inserted, sealing is performed with elastic crimping between an inner peripheral surface of the resin pipe and an inner cylinder outer peripheral surface.SELECTED DRAWING: Figure 3

Description

  The present invention relates to, for example, a pipe joint for connecting resin pipes constituting a pipe for water supply or hot water supply in a residential facility, and the resin pipe is simply inserted and pushed into a connection port of the pipe joint. It is related with the thing of the structure provided so that it could connect to a pipe joint.

FIG. 10 shows an example of a pipe joint having a structure in which connection is made by inserting and pushing an end of a resin pipe into a connection port.
As shown in the figure, the pipe joint 100 has a connection port 101 formed on the outer periphery of a joint body 103 having an inner cylinder 102 formed at a size such that the resin pipe P is fitted on the outer side. The outer cylinder 104 having a larger diameter than the outer cylinder 104 is attached. Further, a cylindrical cap 105 is similarly attached to the tip of the outer cylinder 104, and the outer peripheral surface of the inner cylinder 102 to which the seal members 106, 106 are attached and the outer cylinder. A pull-out preventing member 107 that fixes the resin pipe P at the insertion position and an insertion guide 108 that guides the insertion position of the end portion of the resin pipe P are installed between the inner peripheral surface 104 and the cap 105.

  Then, as shown in FIG. 11, when the end of the resin tube P is pressed against the insertion guide 108 and the resin tube P is inserted into the connection port 101, the insertion guide 108 that contacts the tip of the resin tube P is formed. In the process, the inner peripheral edge of the pull-out prevention member 107 disposed outside the inner cylinder 102 is brought into contact with the outer peripheral surface of the resin pipe P and pushed in the diameter reducing direction. The generated elastic force in the expanding direction is applied to the outer peripheral surface of the resin tube P to hold the resin tube P at the insertion position, and the seal members 106 and 106 attached to the outer peripheral surface of the inner cylinder 102 are provided inside the resin tube P. The insertion guide 108, which is hermetically connected to the peripheral surface and pressed by the resin pipe P and moved to the depth of the connection port 101, is press-fitted to the inner peripheral surface of the outer cylinder 104, whereby the resin pipe P is inserted into the insertion position. Fixed to the pipe joint 100 Are then urchin configuration (for example, see Patent Document 1).

JP 2012-72895 A

The operation of connecting the resin pipe P to the illustrated pipe joint 100 is performed by placing the tip of the resin pipe P on the insertion guide 108 attached to the outside of the inner cylinder 102 with the connection port 101 and the pipe axis of the resin pipe P aligned. This is done by pushing the resin tube P to the back of the connection port 101 at once.
At this time, if an abnormal insertion operation such as inserting the resin tube P obliquely, inserting the resin tube P while turning it, or pulling it out in the middle of the insertion operation and then inserting it again, The connection of the resin pipe P to 101 is incomplete, and the airtightness of the connection portion is impaired, which may cause water leakage.

For example, when the resin tube P is to be inserted obliquely, if the resin tube P remains oblique, the insertion guide 108 that comes into contact with the distal end portion thereof becomes clogged and cannot be inserted. Therefore, when the resin tube P is slightly pulled out from the position where the insertion guide 108 is clogged, a gap is formed between the resin tube P and the insertion guide 108, and the seal member 106 attached to the inner cylinder 102 protrudes from this gap portion. Therefore, when the straightened resin pipe P is inserted again without noticing this, the seal member 106 is inserted with protruding, and a gap is formed between the inner surface of the resin tube P and the outer surface of the inner cylinder 102. Thus, it has been clarified by the present inventors that this causes water leakage.
Alternatively, when the resin pipe P is forcibly inserted while being inclined, one of the pair of seal members 106 and 106 attached to the inner cylinder 102 is caught by the tip of the resin pipe P and exposed to the outside of the inner cylinder 102. Then, as the resin pipe P is pushed in, it protrudes so as to cover and overlap the other seal member 106, hindering airtightness between the inner surface of the resin pipe P and the outer surface of the inner cylinder 102, and leaking water from this portion. Was also clarified by the study of the present inventor.

Of course, if the resin pipe P is inserted into the connection port 101 by a normal operation, the resin pipe P is firmly connected to the pipe joint 100 without impairing the airtightness. However, for example, a delay in the construction work of the piping has occurred, so the operation of inserting the resin tube P momentarily or the worker unfamiliar with the construction of the piping connecting the resin tube P to the pipe joint 100 is performed. It is inevitable that the resin pipe P may be connected to the pipe joint 100 without noticing that an abnormal insertion operation has been performed, and this may be laid as it is.
In such a case, water leakage due to poor connection of the resin pipe P is often found by actually flowing water after completion of the piping construction, and in order to repair the poor connection of the resin pipe P, If it exists, unnecessary work costs will occur. Even if the resin pipe P is connected by an abnormal insertion operation, it is important to take measures and measures that do not cause water leakage.

  In view of the above-described problems of the prior art, the present invention is configured to connect a resin pipe to a pipe joint by inserting and pushing the end of the resin pipe into a connection port. In a joint, even if the resin pipe is connected to the pipe joint by an abnormal insertion operation, it is an object to be able to maintain the water tightness of the connection portion while securely connecting the resin pipe to the pipe joint. To do.

  As a result of intensive studies to solve the above problems, the present inventor has made resin even when force is applied in the direction of pulling out the inserted resin tube so that a gap is not easily formed between the inner surface of the resin tube and the outer surface of the inner cylinder. Equipped with a separation prevention means that prevents movement in the separation direction so that the tube and the insertion guide are not separated, especially when the resin tube and the insertion guide pass through the seal member, it becomes difficult to form a gap. It has been found that the above problems can be solved, and the present invention has been completed.

That is, the present invention is a pipe joint for connecting resin pipes by inserting an end portion of a resin pipe into a connection port, and an inner cylinder having a seal member mounted on an outer peripheral surface forming the connection port, and the inner cylinder Between the outer cylinder and the cap disposed on the outside of the pipe joint, the pipe joint including an insertion guide for guiding the resin pipe and a pull-out preventing member for holding the end of the inserted resin pipe in the insertion position.
It is characterized in that a separation preventing means for preventing separation between the insertion guide and the resin tube is provided on the side of the insertion guide where the end of the resin tube abuts.

According to this, the operation of connecting the resin pipe to the pipe joint can be performed by pushing the resin pipe into the connection port of the pipe joint in a state where the distal end portion of the resin pipe is pressed against the insertion guide.
Since the separation preventing means is provided on the side of the insertion guide where the end of the resin tube abuts, the resin tube and the insertion guide are integrated into the sealing member in the process of pushing the resin tube to the fixed position at the back of the connection port. Since it passes, the seal member does not squeeze out and does not protrude to form a gap, and the resin tube can be held in a fixed position by the separation preventing means in a state where the resin tube is pushed to the back of the connection port. . Since the resin tube is integrally fixed to the insertion guide, the inner and outer peripheral surfaces of the resin tube are securely sealed by the sealing member and the insertion guide, and water leakage occurs due to a gap between the inner and outer periphery of the resin tube. There is nothing.

In the joint pipe having the above-described configuration, the separation preventing means applies a force in a direction opposite to the pulling direction to the resin pipe when a force directed to the resin pipe is pulled out from the connection port of the pipe joint. It is a mechanism for holding the resin tube whose tip is in contact with the insertion guide at the contact position.
As the position holding mechanism constituting the separation preventing means, for example, in a state in which the resin tube is inserted to the fixed position, the members are brought into close contact with each other between the resin tube and the surfaces of the inner cylinder and the outer cylinder in contact with the inner and outer peripheral surfaces thereof. The outer surface of the inner cylinder that is directly contacted between the surfaces of the resin tube and the inner and outer cylinders by contact, or that is elastically loaded with an elastic material between the surfaces, or that is in contact with the inner surface of the resin tube The structure which hold | maintains a resin pipe in a fixed position is mentioned by making a frictional force act between between and the outer cylinder inner surface which touches an outer surface.
Further, for example, there is a method of providing a component such as an adhesive having a function of tightly adhering the resin tube to the end of the insertion guide on the side where the end of the resin tube abuts to provide a separation preventing function. It is done. Alternatively, as another form of the separation preventing means, the insertion guide and the resin tube, such as those by screw friction, friction welding, and ultrasonic welding, are integrated, and not only when inserting the resin tube, but also by resin Appropriate means, members, and methods that have a function of preventing the insertion guide and the resin tube from being separated even when a force acts in the direction of pulling out the tube can be considered.

  Further, in the pipe joint having the above-mentioned configuration, the separation preventing means is provided on the inner peripheral surface of the resin tube, which is provided integrally or separately with the insertion guide on the inner peripheral edge of the end of the insertion guide on the side where the end of the resin tube abuts. And a sealing piece that is pressure-bonded between the outer peripheral surfaces of the inner cylinder.

According to this, when the resin tube is pushed into the inside of the connection port, the insertion guide that contacts the tip of the resin tube is moved to the back side of the connection port, and in the process, the pull-out prevention member disposed outside the inner cylinder The inner peripheral end of the resin tube abuts on the outer peripheral surface of the resin tube and is pushed in the diameter reducing direction, and the elastic force generated in the diameter direction acts on the outer peripheral surface of the resin tube to hold the resin tube in the insertion position. . In addition, the seal member mounted on the outer peripheral surface of the inner cylinder is pressed against the inner peripheral surface of the resin tube, and an insertion guide that is pushed by the resin tube and moved to the back of the connection port is formed on the inner peripheral surface of the outer tube. Further, the sealing piece provided on the insertion guide is sandwiched between the inner peripheral surface of the resin tube and the outer peripheral surface of the inner cylinder and is elastically pressure-bonded to both peripheral surfaces, and the surfaces of the inner cylinder and the outer cylinder and between them The space between the inner and outer peripheral surfaces of the inserted resin pipe is securely sealed.
Even if the resin pipe is connected to the pipe joint by an abnormal insertion operation, even if there is a gap between the inner peripheral surface of the resin pipe and the outer peripheral surface of the inner cylinder, the seal member attached to the inner cylinder protrudes Since the sealing piece provided on the guide is elastically pressure-bonded to the inner peripheral surface of the resin tube and the outer peripheral surface of the inner cylinder, the watertightness between the surface of the resin tube and the inner cylinder is maintained, and water leakage due to abnormal insertion operation Can be reliably prevented.

Further, instead of or together with the sealing piece provided on the inner peripheral edge of the side of the insertion guide where the end of the resin tube abuts, the outer peripheral edge of the side of the insertion guide where the end of the resin tube abuts is provided. A sealing piece that is elastically pressure-bonded between the outer peripheral surface of the resin tube and the inner peripheral surface of the outer cylinder may be provided.
Also by this, the sealing piece provided in the insertion guide by the insertion operation of the resin tube is sandwiched between the outer peripheral surface of the resin tube and the inner peripheral surface of the outer cylinder, and is elastically pressure-bonded to both the outer peripheral surfaces. It is possible to reliably seal between the surface and the inner and outer peripheral surfaces of the resin pipe inserted therebetween.
Even if the resin tube is connected to the pipe joint by an abnormal insertion operation, the sealing piece provided on the insertion guide is elastically pressed to the outer peripheral surface of the resin tube and the inner peripheral surface of the outer cylinder, and the resin tube and the outer The water tightness between the surfaces of the cylinders can be maintained, and the occurrence of water leakage due to an abnormal insertion operation can be reliably prevented.

  In the pipe joint having the above-described configuration, the resin of the insertion guide is used so that the sealing piece of the insertion guide is securely elastically pressure-bonded to the resin pipe and the inner cylinder or the outer cylinder at the position where the resin pipe pushed into the connection port is fixed. When the sealing piece is provided on the inner peripheral edge of the end on the side where the end of the tube abuts, the sealing is provided on the outer peripheral surface of the inner cylinder, and when the sealing piece is provided on the outer peripheral edge of the end of the insertion guide, respectively. You may provide the ditch | groove in which a stop piece fits. As long as the sealing piece has the above function, it may be provided separately from the insertion guide.

  The present invention is not limited to a T-shape or a pipe joint in which an insertion guide and a pull-out preventing member are arranged between an inner cylinder, an outer cylinder and a cap into which an end portion of a resin pipe is inserted to form a connection port. The present invention can be applied to any shape such as a Y shape or an L shape.

It is a schematic sectional drawing of the connection port in the pipe joint of one Embodiment of this invention. It is the external view (A) and cross-sectional view (B) of the insertion guide with which the pipe joint of FIG. 1 was mounted | worn. It is the figure which showed the half surface of the cross section of the state which inserted and connected the resin pipe | tube to the pipe joint of FIG. FIG. 4 is a partially enlarged view of FIG. 3. It is sectional drawing of the other form of an insertion guide. It is the figure which showed the half surface of the cross section of the state which inserted and connected the resin pipe | tube to the pipe joint provided with the insertion guide of FIG. It is the figure which showed the half surface of the cross section of the state which inserted and connected the resin pipe | tube to the pipe joint of the other form provided with the insertion guide of FIG. It is the figure which showed the half surface of the cross section of the state which inserted and connected the resin pipe | tube to the pipe joint of the other form provided with the insertion guide of FIG. (A), (B) is sectional drawing of the further another form of an insertion guide. It is the figure which fractured | ruptured and showed the connection port in the pipe joint of an example of the past. It is the figure which fractured | ruptured and showed the principal part of the connection port of the state which connected the resin pipe to the pipe joint of FIG.

A preferred embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a configuration of a connection port of a pipe joint according to an embodiment of the present invention. In the illustrated pipe joint 1, similarly to the above-described conventional pipe joint 100, a cylindrical outer cylinder 5 is attached to the outer periphery of a joint body 4 provided with an inner cylinder 3 at the tip, and a cylindrical shape is attached to the outer periphery of the outer cylinder 5. And a pull-out preventing member 8 for fixing the resin pipe P at the insertion position between the outer peripheral surface of the inner cylinder 3 to which the seal members 7 and 7 are attached and the inner peripheral surfaces of the outer cylinder 5 and the cap 6. And an insertion guide 9 for guiding the insertion position of the end portion of the resin pipe P is provided.

  More specifically, the insertion guide 9 is formed in a ring shape using a hard resin material having elasticity, and as shown in FIG. When the pipe P is inserted into the connection port 2, the resin pipe P inserted into the connection port 2 is fixed to the inner periphery of the end on the side where the end of the resin tube P comes into contact with the inner peripheral surface of the resin pipe P. A sealing piece 9b, which is a separation preventing means, is formed by protruding between the outer peripheral surfaces of the inner cylinder 3 and preferably elastically pressing.

  The length of the sealing piece 9b is preferably long enough that the insertion guide 9 and the resin tube P are not separated by friction with the resin tube P when the resin tube P is inserted. The sealing piece 9b preferably has a shape, thickness and length that does not hinder the insertion of the resin tube P, and the surface and the end are tapered so that the resin tube P can be easily inserted. It may be attached.

  Furthermore, a position shift prevention unit composed of a concave part or a convex part having a function of preventing position shift may be provided on the outer peripheral surface of the sealing piece 9b. If such a misalignment prevention portion is provided, a part of the resin tube P can be easily brought into close contact with the surface of the sealing piece 9b by the elastic restoring force, and the separation between the resin tube P and the insertion guide 9 is more effective. Can be suppressed. The misregistration prevention portion can be formed at any location on the outer peripheral surface of the sealing piece 9b, but it is preferable that the positional deviation prevention portion is continuously formed along the circumferential direction of the sealing piece 9b.

  As shown in FIG. 3, the pipe joint 1 according to the present embodiment configured as described above is inserted so that the end of the resin pipe P contacts the tip of the resin pipe P when the end of the resin pipe P is inserted into the connection port 2 and pushed in. The guide 9 is moved to the back side of the connection port 2, and in the process, the inner peripheral end of the pull-out prevention member 8 disposed outside the inner cylinder 3 comes into contact with the outer peripheral surface of the resin pipe P and is pushed in the diameter reducing direction. Thus, the elastic force generated in the diameter expanding direction acts on the outer peripheral surface of the resin pipe P, and the resin pipe P is fixed at the insertion position. When the inner peripheral end of the pull-out preventing member 8 is bent toward the back side of the connection port 2 and is engaged with the outer peripheral surface of the resin pipe P, a force is applied in the direction of pulling out the inserted resin pipe P. The resin pipe P is prevented from being displaced in the same direction, and the resin pipe P is held at the insertion position.

  Further, seal members 7 and 7 attached to the outer peripheral surface of the inner cylinder 3 are pressed against the inner peripheral surface of the resin pipe P to seal between the inner peripheral surface of the resin pipe P and the outer peripheral surface of the inner cylinder 3, and resin The elastic protrusion 9a of the insertion guide 9 pushed by the pipe P and moved to the back of the connection port 2 presses against the inner surface of the outer cylinder 5, and is further provided on the insertion guide 9 as shown in FIG. The sealed piece 9b is sandwiched between the inner peripheral surface of the resin tube P and the outer peripheral surface of the inner cylinder 3, and is crimped to both peripheral surfaces, preferably elastically crimped, and the surfaces of the inner cylinder 3 and the outer cylinder 5 and between them The space between the inner and outer peripheral surfaces of the resin pipe P inserted in is securely sealed, and it is possible to prevent water from leaking from the connection site.

  In this case, the resin pipe P is connected to the pipe joint 1 by an abnormal insertion operation, and the seal member 7 attached to the inner cylinder 3 protrudes between the inner peripheral surface of the resin pipe P and the outer peripheral surface of the inner cylinder 3. Even if there is a gap, the sealing piece 9b is pressure-bonded to the inner peripheral surface of the resin tube P and the outer peripheral surface of the inner tube 3, and preferably elastically pressed. Sex is preserved.

  FIG. 5 shows an insertion guide 9 used for the pipe joint 1 according to another embodiment of the present invention, which is on the side where the end of the resin pipe P abuts when the resin pipe P is inserted into the connection port 2. At the position where the resin pipe P inserted into the connection port 2 is fixed at the outer peripheral edge of the end portion, a sealing piece 9b is pressed between the outer peripheral surface of the resin pipe P and the inner peripheral surface of the outer cylinder 5, and preferably elastically pressed. It is set.

The pipe joint 1 according to the present embodiment is configured using the insertion guide 9 and, as shown in FIG. 6, when inserted into the connection port 2 of the resin pipe P and pushed in, the pull-out preventing member 8 can be The resin tube P is held at the insertion position by the peripheral end being pressed against and engaged with the outer peripheral surface of the resin tube P, and the seal members 7 and 7 are elastically attached to the inner peripheral surface of the resin tube P. The projecting pieces 9 a are in pressure contact with the inner surface of the outer cylinder 5, and the sealing piece 9 b provided on the insertion guide 9 is sandwiched between the outer peripheral surface of the resin tube P and the outer peripheral surface of the outer cylinder 5 and is crimped to both peripheral surfaces. In addition, it is possible to securely seal between the inner cylinder 3 and the outer cylinder 5 and the inner and outer peripheral surfaces of the resin pipe P inserted therebetween by elastic compression.
Even if the resin pipe P is connected to the pipe joint 1 by an abnormal insertion operation, the sealing piece 6b is pressure-bonded to the outer peripheral surface of the resin pipe P and the inner peripheral surface of the outer cylinder 5, and preferably is elastically pressed so as to be watertight. Can be prevented, and the occurrence of water leakage can be prevented.

In the case where the insertion guide 9 shown in FIG. 5 is provided with a misalignment prevention portion as in the above-described embodiment, it is preferably provided on the inner peripheral surface of the sealing piece 9b. By providing the misalignment prevention portion on the inner peripheral surface of the sealing piece 9b, a part of the resin tube P is easily brought into close contact with the surface of the sealing piece 9b by the elastic restoring force. Can be more effectively suppressed.
The misregistration prevention portion can be formed at any location on the inner peripheral surface of the sealing piece 9b, but it is preferable that the positional deviation prevention portion is continuously formed along the circumferential direction of the sealing piece 9b.

FIG. 7 shows another form of the pipe joint 1, which corresponds to the case where the insertion guide 9 shown in FIG. A concave groove 3a into which the piece 9b is press-fitted is provided.
FIG. 8 shows still another form of the pipe joint 1, which corresponds to the inner circumference of the outer cylinder 5 when the insertion guide 9 shown in FIG. 5 is used. A concave groove 5a into which the sealing piece 9b is press-fitted is provided on the surface.
Also in the pipe joint 1 of these forms, the sealing piece 9b of the insertion guide 9 is placed on the inner surface of the resin pipe P and the inner cylinder 3 or the outer cylinder 5 at the position where the resin pipe P pushed into the connection port 2 is fixed. By securely elastically pressing, the space between the surfaces of the inner cylinder 3 and the outer cylinder 5 and the inner and outer peripheral surfaces of the resin pipe P inserted therebetween are surely sealed.

  9 shows another form of the insertion guide 9. FIG. 9 (A) shows a modification of the insertion guide 9 shown in FIG. 2, and FIG. 9 (B) shows the insertion shown in FIG. When the sealing piece 9b is long and thinly tapered from the distal end side to the original end side, and the resin pipe P is pushed into the connection port 2, both of the guides 9 are modified (A). Is a sealing piece 9b inserted between the inner peripheral surface of the resin tube P and the outer peripheral surface of the inner cylinder 3 so that the both surfaces are securely sealed, and (B) is the outer peripheral surface of the resin tube P and the outer cylinder. The sealing piece 9b is inserted between the inner peripheral surfaces of 5 and the space between both surfaces is surely sealed.

  Each member such as the illustrated pipe joint and the insertion guide constituting the pipe joint is an example of the present invention, and the present invention is not limited thereto, and may be configured in other appropriate forms. Is possible.

DESCRIPTION OF SYMBOLS 1 Pipe joint, 2 Connection port, 3 Inner cylinder, 4 Joint main body, 5 Outer cylinder, 6 Cap, 7 Seal member, 8 Pull-out prevention member, 9 Insertion guide, 9b Sealing piece, P resin pipe

Claims (4)

It is a pipe joint for connecting resin pipes by inserting an end portion of a resin pipe into a connection port, and is arranged on the outer surface of the outer tube forming the connection port and on the outer side of the inner tube Between the outer cylinder and the cap, in a pipe joint including an insertion guide for guiding the resin pipe and a pull-out preventing member for holding the end of the inserted resin pipe at the insertion position,
A pipe joint having a configuration in which a separation preventing means for preventing separation between the insertion guide and the resin pipe is provided on the side of the insertion guide where the end of the resin pipe abuts.   The separation preventing means applies a force in the direction opposite to the pulling direction to the resin pipe when a force directed to the resin pipe in the direction of pulling out from the connection port of the pipe joint is applied. The pipe joint according to claim 1, wherein the pipe joint is a mechanism for holding the resin pipe in contact with the contact position.   The separation preventing means is pressure-bonded between the inner peripheral surface of the resin tube and the outer peripheral surface of the inner cylinder provided integrally or separately with the insertion guide at the inner peripheral edge of the end of the insertion guide on the side where the end of the resin tube abuts. The pipe joint according to claim 1 or 2, which is a sealing piece.   The separation preventing means is crimped between the outer peripheral surface of the resin tube and the inner peripheral surface of the outer cylinder, which is provided integrally or separately on the outer peripheral edge of the end of the insertion guide on the side where the end of the resin tube abuts. The pipe joint according to claim 1, wherein the pipe joint is a sealing piece.

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