JP6530665B2 - Fitting method and fitting of fitting - Google Patents

Description

  The present invention relates to a method of assembling a pipe joint used for a fluid pipe such as a water pipe, and a pipe joint.

  As exemplified in Patent Documents 1 to 3, at a connection point of a fluid pipe such as a water pipe, a pipe joint formed by inserting a fluid pipe into a joint body is used. The joint body is constituted by a pipe body having a socket formed at the end on either or both sides in the axial direction.

  The pipe joint generally comprises a packing for sealing a gap between the inner peripheral surface of the joint body and the outer peripheral surface of the fluid pipe, a pressing ring for pressing the packing in the axial direction, and a fastener for fastening the pressing ring to the coupling body And further includes a retaining member acting on the outer peripheral surface of the fluid pipe when having the detachment preventing function. Heretofore, since the number of parts is relatively large and the structure is relatively complicated and it is difficult to meet the demand for cost reduction, there has been a strong demand for a technical proposal for a pipe joint with a simple configuration.

JP, 2010-175028, A JP 2004-340365 Unexamined-Japanese-Patent No. 2001-50446

  The present invention has been made in view of the above situation, and an object thereof is to provide a method of assembling a pipe joint with a simple configuration and a pipe joint used in the method.

  As a result of repeated researches to achieve the above object, the present inventor does not obtain a sealed state by pressing the packing, but a novel pipe joint in which the sealed state is obtained by drawing in the packing as described later. Methods and fittings are contemplated. These do not require the push ring fastened to the joint body and the fastener used for the fastening, and can be realized with a simple configuration as compared with the prior art, thereby contributing to cost reduction.

In the method of assembling a pipe joint according to the present invention, a fluid pipe is inserted into a joint body, and one end of a first ring externally fitted to the fluid pipe is disposed outside the joint body, and The step of disposing the other end inward of the joint body, and the second ring engaged with the one end side of the first ring is moved away from or reduced in diameter from the joint body, and the first ring is interlocked therewith By moving in the direction, the other end of the first ring is drawn into the gap between the inner peripheral surface of the joint main body and the outer peripheral surface of the fluid pipe, and the packing provided on the other end side of the first ring e Bei a step of sealing the gap, wherein the first ring, and a plurality of retaining members disposed at an interval in the circumferential direction, they and a connecting member for connecting the annular, said retaining member Bite into the outer peripheral surface of the fluid pipe on the inner peripheral surface of the Nails have been formed, the are connecting member is formed of an elastic material, reduced in diameter to said first ring is moved in the pull-out direction, in which bite into the claw to the outer peripheral surface of the fluid tube.

  In this method of assembling the pipe joint, a first ring interposed between the joint body and the fluid pipe and a second ring engaged with one end of the first ring are used. A packing is provided on the end side. By moving the first ring in the pulling direction by operating the second ring from the state in which each of the first and second rings is arranged at a predetermined position, the inner peripheral surface of the joint body and the outer peripheral surface of the fluid pipe The gap can be sealed with packing, and the fitting can be assembled.

In the assembling method of the pipe joint, reduced in diameter to said first ring is moved in the drawing direction, Ru and the claw formed on the first ring so bite into the outer peripheral surface of the fluid tube. Thus, the fluid pipe can be prevented from coming out of the joint body, and the detachment prevention function can be exhibited. Moreover, since the first ring acts on the outer peripheral surface of the fluid pipe, the number of parts does not increase.

  It is preferable that the end portion of the joint body is axially pressed by a pressing member attached to the second ring, and the second ring be moved away from the joint body by using the reaction force. According to this method, the second ring can be properly separated from the joint body, and the pipe joint can be easily assembled.

  After sealing the gap, it is preferable to attach a fixing member for fixing the relative position of the first ring to the joint body. By attaching such a fixing member, the sealed state of the fitting can be maintained properly.

Further, the pipe joint according to the present invention includes a joint body into which a fluid pipe is inserted, a first ring externally fitted to the fluid pipe, and one end side of the first ring disposed outside the joint body. And a packing provided on the other end side of the first ring disposed on the inner side of the joint main body, and the first ring is disposed at an interval in the circumferential direction And a connecting member for connecting the members in an annular shape, and a claw capable of biting into an outer peripheral surface of the fluid pipe is formed on an inner peripheral surface of the removable member. The member is formed of an elastic body, and moving the second ring away from or reducing the diameter of the joint body moves the first ring in the pulling direction in conjunction therewith, and the other end of the first ring Clearance between the inner peripheral surface of the joint body and the outer peripheral surface of the fluid pipe Those that are to be drawn.

  The pipe joint includes a first ring interposed between the joint body and the fluid pipe, and a second ring engaged with one end of the first ring, and the other ring is provided with a packing. It is done. By operating the second ring and moving the first ring in the pulling direction from the state where each of the first and second rings is arranged at a predetermined position, the inner peripheral surface of the joint body and the outer peripheral surface of the fluid pipe The other end of the first ring is drawn into the gap of. A packing is provided on the other end side of the first ring, and the gap can be sealed via the packing.

In this pipe joint, the first ring is that having a pawl which can bite into the outer peripheral surface of the fluid tube. As a result, the fluid pipe can be prevented from coming off from the joint body, and the pipe joint can be configured as a detachment preventing function. Moreover, since the first ring acts on the outer peripheral surface of the fluid pipe, the number of parts does not increase.

In this pipe joint, the first ring is provided with a plurality of retaining members arranged at intervals in the circumferential direction, and a connecting member for annularly connecting them, and the inner circumferential surface of the retaining member is provided with the above-mentioned claws are formed, the connection member that is formed of an elastic material. According to this configuration, since the first ring can expand and contract in the circumferential direction by the elastic deformation of the connecting member, the diameter of the first ring is expanded and externally fitted to the fluid pipe, or the diameter of the first ring is reduced and the fluid pipe It is easy to make the claw bite into the outer peripheral surface of.

  The second ring has a pressing member capable of pressing the end of the joint body in the axial direction, and the second ring can be moved away from the joint body by using the reaction force of the pressing by the pressing member. Is preferred. According to this configuration, the second ring can be properly kept away from the joint body by a simple operation on the pressing member.

  It is preferable that the outer peripheral surface on one end side of the first ring and the inner peripheral surface of the second ring be engaged with each other through an inclined surface which is expanded in diameter in the drawing direction of the first ring. According to this configuration, when the second ring is moved away from or reduced in diameter from the joint body, the first ring is moved in the pulling direction by pressing via the inclined surface, and the diameter of the first ring is further reduced. it can.

A half sectional view showing a pipe joint according to an embodiment of the present invention Front view of the pipe joint Sectional view showing the vicinity of the end of the joint body in the sealed state (A) front view of the first ring, (b) CC sectional view and (c) DD sectional view (A) front view of the second ring, (b) EE cross section and (c) FF cross section Sectional view showing the vicinity of the end of the joint body before sealing Sectional view showing a pipe joint according to another embodiment of the present invention Front view of the pipe joint Sectional view showing the vicinity of the end of the joint body in the sealed state

  Embodiments of the present invention will be described with reference to the drawings. As described later in detail, in this method of assembling the joint, in order to move the first ring in the pulling direction, the second ring engaged with one end of the first ring is moved away from or shrunk from the joint body. Make it diameter. The first embodiment shows an example in which the second ring is moved away from the joint body, and the second embodiment shows an example in which the diameter of the second ring is reduced.

First Embodiment
The pipe joint shown in FIGS. 1 and 2 includes the joint body 3 into which the fluid pipe P1 is inserted, the first ring 1 externally fitted to the fluid pipe P1, and the first ring disposed outside the joint body 3 A second ring 2 engaged with one end side of the ring 1 and a packing 4 provided on the other end side of the first ring 1 disposed inward of the joint body 3 are provided. The upper half of FIG. 1 and FIG. 3 (a) correspond to the A-A cross section of FIG. 2, and FIG. 3 (b) corresponds to the B-B cross section of FIG. FIG. 3 (a) is also an enlarged view of an essential part of FIG. 1, and shows a cross section at a position different from FIG. 3 (b).

  The fluid pipe P1 is in communication with the fluid pipe P2 via the joint body 3. The fluid pipe P1 and the fluid pipe P2 are connected to the joint body 3 by the same joint structure and have the same diameter as each other, but not limited thereto. The fluid pipes P1 and P2 are used as water pipes through which tap water, agricultural water, industrial water, etc. flow, but the invention is not limited thereto, and even fluid pipes through which liquids other than water, gases, mixtures of liquids and gases, etc. flow I do not care. The fluid pipes P1 and P2 are formed of a vinyl chloride pipe, but not limited to this, and may be formed of, for example, a steel pipe, a cast iron pipe, a polyethylene pipe, or a polyolefin pipe.

  The joint body 3 is formed in a tubular shape, and the end of the fluid pipe P1 can be inserted into the end thereof. On the inner peripheral surface of the end portion of the joint main body 3, a reduced diameter portion 31 which is reduced in diameter in the drawing direction PD is formed. The withdrawal direction PD is a direction in which the first ring 1 is withdrawn from the joint body 3 and is the left direction in FIG. An annular space 32 in which the packing 4 is disposed is formed between the inner peripheral surface of the joint main body 3 and the outer peripheral surface of the fluid pipe P1, and the reduced diameter portion 31 with respect to the space 32 faces in the drawing direction PD. doing.

  In the present embodiment, the joint main body 3 has a symmetrical shape with respect to the center line CL, and the fluid pipes P1 and P2 are inserted at both ends in the axial direction. However, the present invention is not limited to this, and the shape may be asymmetric. In addition, the fluid pipe may be inserted into only one end of the joint main body 3. In this case, the other end can be formed as a tube having the same or different diameter as the fluid pipe P1.

  As shown in FIG. 4, the first ring 1 is formed of an undivided annular body having no split structure, and is integrally provided continuously in the circumferential direction. The minimum inner diameter of the first ring 1 in a natural state where no external force is applied is preferably larger than the outer diameter of the fluid pipe P1, whereby the first ring 1 can be smoothly fitted on the fluid pipe P1 (see FIG. 6). The first ring 1 is interposed between the joint body 3 and the fluid pipe P1, and one end in the axial direction (the end on the left side of FIG. 4B) is disposed outside the joint body 3 and the other end The right end of FIG. 4 (b) is disposed inward of the joint body 3.

  The second ring 2 is engaged with one end of the first ring 1. Thereby, when the second ring 2 is moved away from the joint main body 3, the first ring 1 moves in the pull-out direction PD in conjunction with it. In the first embodiment, the outer peripheral surface on one end side of the first ring 1 and the inner peripheral surface of the second ring 2 are provided via inclined surfaces 11 and 21 whose diameter is increased in the drawing direction PD of the first ring 1. When the second ring 2 is moved away from the joint body 3 (that is, moved in the pull-out direction PD), the first ring 1 moves in the pull-out direction PD.

  The outer diameter of the other end side of the first ring 1 is larger than the inner diameter of the end portion of the joint body 3, and more specifically, larger than the minimum inner diameter of the reduced diameter portion 31. Therefore, as shown in FIG. 3A, when the first ring 1 moves in the pull-out direction PD, the other end engages with the end of the joint main body 3 and the first ring 1 moves in the pull-out direction PD Can not do it. In addition, the 1st ring 1 of Fig.3 (a) is in the state made to be diameter-reduced from a natural state. As described later, the first ring 1 is provided with the retaining member 13, and the outer peripheral surface of the retaining member 13 is inclined in the same direction as the diameter reducing portion 31.

  The first ring 1 of the present embodiment, as shown in FIG. 4, connects a plurality of (eight in the present embodiment) retaining members 13 arranged at intervals in the circumferential direction, and annularly connecting them. And a connecting member 14. The retaining member 13 is formed of an arc-shaped member curved along the circumferential direction, and the claw 12 is formed on the inner peripheral surface thereof. The retaining member 13 is formed of, for example, metal or resin. The connection member 14 is formed of an elastic body, and in the present embodiment, formed of rubber fixed to the retaining member 13. In the present embodiment, although the packing 4 is configured by the connection member 14, these may be separate.

  As shown in FIG. 5, the second ring 2 is formed of an undivided annular body having no split structure, and is integrally provided continuously in the circumferential direction. The second ring 2 is externally fitted to one end side of the first ring 1 and disposed outside the joint body 3. As described above, when the second ring 2 is moved away from the joint body 3, the first ring 1 moves in the pulling direction PD in conjunction with it, and the other end of the first ring 1 is the inner peripheral surface of the joint body 3 And the outer circumferential surface of the fluid pipe P1.

  The second ring 2 of the present embodiment has a pressing bolt 22 as a pressing member capable of pressing the end of the joint body 3 in the axial direction. The pressing bolts 22 are disposed at a plurality of locations (four locations in the present embodiment) in the circumferential direction, and are screwed into the axially extending through holes 23. As shown in FIG. 2, the push bolt 22 is attached at a circumferential position different from that of the retaining member 13. As shown in FIG. 3 (b), when the end of the joint body 3 is axially pressed by the push bolt 22, the second ring 2 is moved away from the joint body 3 using the reaction force of the press by the push bolt 22. be able to.

  The packing 4 has an annular shape and is formed of an elastic body such as rubber. In FIGS. 1 to 3, the gap between the inner peripheral surface of the joint body 3 and the outer peripheral surface of the fluid pipe P1 is sealed via the packing 4, and the joint body 3 is watertightly connected to the fluid pipe P1. In the state where the pipe joint is assembled in this manner, the packing 4 is pushed in from the inward side of the joint body 3 by the action of water pressure, so that the inner circumferential surface of the joint body 3 and the outer circumferential surface of the fluid pipe P1 can be easily adhered. Further, a recess 41 opened toward the space 32 is formed in the packing 4 and the water pressure acts to expand the recess 41, thereby enhancing the sealing effect.

  FIG. 6 shows the state before sealing. By moving the second ring 2 away from the joint body 3 (moving it in the drawing direction PD), the first ring 1 moves in the drawing direction PD in conjunction with it, and the other end of the first ring 1 as shown in FIG. Can be drawn into the gap between the inner peripheral surface of the joint main body 3 and the outer peripheral surface of the fluid pipe P 1, and the gap can be sealed via the packing 4. As described above, unlike the conventional pipe joint in which the packing is pressed by the pressing ring and pushed into the gap, the packing 4 provided on the first ring 1 is drawn into the gap by the operation of the second ring 2 and sealed. Get the status.

  As shown to Fig.6 (a), the 1st ring 1 has the nail | claw 12 which can bite in the outer peripheral surface of the fluid pipe P1. The claw 12 is a protrusion having a triangular shape in cross section, and is formed on the inner peripheral surface on one end side of the first ring 1. In this example, the two claws 12 are arranged side by side in the axial direction, but the invention is not limited thereto. In FIG. 3A, the diameter of the first ring 1 moved in the drawing direction PD is reduced, and the claws 12 formed on the first ring 1 are cut into the outer peripheral surface of the fluid pipe P1.

  In order to assemble this pipe joint, first, as shown in FIG. 6, the fluid pipe P1 is inserted into the joint body 3 and one end of the first ring 1 externally fitted to the fluid pipe P1 is made outward of the joint body 3 Place and arrange the other end of the first ring 1 inside the joint body 3. Since the diameter of the first ring 1 can be reduced by the elastic deformation of the connecting member 14, it is easy to arrange the first ring 1 on the inner peripheral side of the joint body 3 or the second ring 2. Further, in this example, since the minimum inner diameter of the first ring 1 is larger than the outer diameter of the fluid pipe P1, the resistance when inserting the fluid pipe P1 is small and the workability is excellent.

  Next, as shown in FIG. 3, the second ring 2 engaged with one end of the first ring 1 is moved away from the joint body 3, and the first ring 1 is moved in conjunction with the movement of the first ring 1 in the pulling direction PD. The other end is drawn into the gap between the inner peripheral surface of the joint body 3 and the outer peripheral surface of the fluid pipe P1, and the gap is sealed via the packing 4 provided on the other end side of the first ring 1. In the reduced diameter portion 31, since the distance between the joint body 3 and the fluid pipe P1 is narrowed in the drawing direction PD, the drawn packing 4 is gradually compressed.

  In the first embodiment, the end portion of the joint main body 3 is axially pressed by the push bolt 22 attached to the second ring 2, and the second ring 2 is moved away from the joint main body 3 using the reaction force. At that time, the inclined surface 21 of the second ring 2 presses the inclined surface 11 in the axial direction, and in conjunction therewith, the first ring 1 moves in the drawing direction PD. Then, when the first ring 1 can not move further in the pulling direction PD, and the second ring 2 is further moved away from the joint main body 3, as shown in FIG. The ring 2 presses the first ring 1 toward the fluid pipe P1, and the diameter of the first ring 1 is reduced.

  After sealing the gap, it is preferable to attach a fixing member for fixing the relative position of the first ring 1 to the joint body 3 so that the sealed state of the pipe joint can be maintained properly. As the fixing member, for example, a spacer 5 disposed between the end of the joint body 3 and the second ring 2 is used. By the arrangement of the spacer 5 as described above, the distance between the joint body 3 and the second ring 2 is maintained, and the position of the first ring 1 is fixed. Can maintain The arrangement of the spacers 5 is also effective to equalize the distance between the joint body 3 and the second ring 2 in the circumferential direction.

Second Embodiment
In the second embodiment, an example is shown in which the diameter of the second ring engaged with one end side of the first ring is reduced and the first ring is moved in the pulling direction in conjunction with the diameter reduction. The second embodiment has the same configuration as that of the first embodiment except for the configuration described below, so the common points are omitted and the differences are mainly described.

  The pipe joint shown in FIG. 7 includes a joint body 6 into which the fluid pipe P1 is inserted, a first ring 7 externally fitted to the fluid pipe P1, and a first ring 7 disposed outside the joint body 6 And a packing 9 provided on the other end side of the first ring 7 disposed inward of the joint body 6. The joint body 6, the first ring 7 and the packing 9 correspond to the above-mentioned joint body 3, the first ring 1 and the packing 4, respectively, and their basic structures and actions are the same.

  In the second embodiment, as shown in FIG. 8, the second ring 8 has a split structure. FIG. 9 corresponds to the GG cross section of FIG. In this example, the second ring 8 has divided portions at two circumferential directions, and fasteners 80 consisting of bolts and nuts are attached to each of the divided portions. Therefore, the diameter of the second ring 8 can be reduced according to the tightening of the fastener 80. In addition, the 2nd ring 8 is not restricted to two division, For example, it is also possible to comprise by C-shaped member of one division.

  The outer peripheral surface on one end side of the first ring 7 and the inner peripheral surface of the second ring 8 are engaged with each other via inclined surfaces 71 and 81 which are diameter-expanded in the drawing direction PD of the first ring 7 . When the diameter of the second ring 8 is reduced from the state of FIG. 7, the inclined surface 81 presses the inclined surface 71 toward the outer peripheral surface of the fluid pipe P1, and the first ring 7 moves in the drawing direction PD in conjunction therewith. The packing 9 seals the gap. Then, the first ring 7 can not move further in the pulling direction PD, and when the diameter of the second ring 8 is further reduced, the diameter of the first ring 7 is reduced as shown in FIG. 9 and the outer peripheral surface of the fluid pipe P1 is The nail 72 bites.

  In the first embodiment, an example in which the second ring is moved away from the joint body is shown, and in the second embodiment, the example in which the diameter of the second ring is reduced is shown. For example, after the second ring is moved away from the joint body using the pressing member as in the first embodiment and the gap is sealed with the packing, the diameter of the second ring of the split structure is reduced as in the second embodiment. It does not matter. Further, as long as the first ring can be moved in the pulling direction by the operation of the second ring as described above, the form in which the second ring is engaged with one end of the first ring is not particularly limited.

  The present invention is not limited to the embodiment described above, and various improvements and modifications can be made without departing from the spirit of the present invention.

1 first ring 2 second ring 3 joint main body 4 packing 5 spacer (an example of a fixing member)
Reference Signs List 6 joint body 7 first ring 8 second ring 9 packing 11 inclined surface 12 claw 13 retaining member 14 connecting member 21 inclined surface 22 pressing bolt (an example of pressing member)
71 inclined surface 72 claw 81 inclined surface P1 fluid pipe

Claims (6)

A fluid pipe is inserted into the joint body, and one end of a first ring externally fitted to the fluid pipe is disposed outward of the joint body, and the other end of the first ring is disposed inwardly of the joint body. Process,
A second ring engaged with one end of the first ring is moved away from or reduced in diameter from the joint body, and the other end of the first ring is moved to the joint by movement of the first ring interlocked therewith. pull the gap between the outer peripheral surface of the fluid tube and the inner peripheral surface of the body, Bei give a, a step of sealing the gap via a packing provided on the other end side of the first ring,
The first ring includes a plurality of circumferentially spaced retaining members, and a connecting member for annularly connecting them;
The inner peripheral surface of the retaining member is formed with a claw which can be bited into the outer peripheral surface of the fluid pipe, and the connection member is formed of an elastic body,
A method of assembling a pipe joint , wherein the diameter of the first ring moved in the drawing direction is reduced, and the claw is bitten into the outer peripheral surface of the fluid pipe . The assembly of pipe joints according to claim 1 , wherein the end portion of the joint body is axially pressed by a pressing member attached to the second ring, and the reaction force is used to move the second ring away from the joint body. How to attach. The method for assembling a pipe joint according to claim 1 or 2 , wherein a fixing member for fixing the relative position of the first ring to the joint body is attached after sealing the gap. A coupling body into which a fluid pipe is inserted, a first ring externally fitted to the fluid pipe, a second ring engaged with one end of the first ring disposed outward of the coupling body, and the second ring And a packing provided on the other end side of the first ring disposed inward of the joint body,
The first ring includes a plurality of circumferentially spaced retaining members, and a connecting member for annularly connecting them;
The inner peripheral surface of the retaining member is formed with a claw which can be bited into the outer peripheral surface of the fluid pipe, and the connection member is formed of an elastic body,
By moving the second ring away from or reducing the diameter of the joint body, the first ring moves in the pulling direction in conjunction therewith, and the other end of the first ring is the inner peripheral surface of the joint body and the fluid A pipe fitting configured to be drawn into a gap with the outer circumferential surface of the pipe. The second ring includes a pressing member capable of pressing the end of the joint body in the axial direction;
The pipe joint according to claim 4, wherein the second ring can be moved away from the joint main body by utilizing a reaction force of pressing by the pressing member. And the inner peripheral surface of the second ring and the one end side outer peripheral surface of the first ring, in claim 4 or 5 engage one another via an inclined surface which is enlarged towards the drawing direction of the first ring Fittings described.

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