JP2002089772A - Joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint enabling the end part of a resin pipe to be surely temporarily fixed in the insert space thereof. SOLUTION: A storage groove 26 having an inner bottom surface formed convergent toward the outside as the depth thereof becomes shallower is formed in the outer peripheral surface of an inner tube part 25. A packing 18 is stored in the storage groove 26 so as to be laterally movable in the storage groove 26.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint for a resin pipe used in a piping system of a water supply system and a hot water supply system, for example.

[0002]

2. Description of the Related Art As a conventional joint of this type, the following is known. That is, the conventional joint mainly includes a main body having an insertion space that allows insertion of the end of the resin pipe, a split ring fitted into one end of the main body, and a nut screwed into one end of the main body. ing.

When connecting a resin pipe to the above-mentioned joint, first, an end of the resin pipe is inserted into an insertion space, and then a nut screwed to the main body is further tightened. When the nut is tightened, the split ring is pushed inward into the joint. The outer peripheral surface of the split ring is engaged with the inner peripheral surface of the main body, and the split ring is reduced in diameter. The part is retained in the insertion space.

[0004]

However, in the above-mentioned conventional joint, it is possible to reliably prevent the resin pipe from falling off after the nut is tightened. In addition, when a force in the pulling direction acts on the resin pipe, there is a problem that the resin pipe falls off relatively easily.

The present invention has been made by focusing on the problems existing in the prior art as described above. An object of the present invention is to provide a joint capable of securely temporarily fixing an end of a resin pipe in an insertion space.

[0006]

In order to achieve the above object, the invention according to claim 1 is characterized in that a main body having a cylindrical shape and having an insertion space therein for allowing insertion of an end of a resin pipe is provided. An inner cylindrical portion protruding from the interior of the main body and being internally fitted into a resin pipe inserted into the insertion space; a split ring inserted into one end of the main body; And the split ring is reduced in diameter as the nut is tightened, so that the split ring engages with the outer peripheral surface of the resin pipe in the insertion space and the end of the resin pipe is inserted into the insertion space. In the joint for preventing the inner tube from falling off, a receiving groove whose inner bottom surface is inclined so as to decrease in depth toward the outside is formed in the outer peripheral surface of the inner cylindrical portion, and the receiving groove is formed in a resin pipe through the receiving groove. Can be moved along the insertion / removal direction of the The first sealing material is pressed into engagement with the inner peripheral surface of the resin pipe to be engaged with the resin pipe, and when the resin pipe is inserted into the insertion space, the first sealing material follows the resin pipe and extends along the insertion direction. By moving, the amount of the first sealing material protruding from the housing groove is reduced, and conversely, when the first sealing material is pulled out, it follows the resin pipe and moves in the direction of removal and protrudes from the housing groove. The gist is that the first sealing material is configured to increase in amount.

According to a second aspect of the present invention, in the joint according to the first aspect, an adhesive layer is provided between the main body and the nut to bond the two together, and the adhesive layer is formed to have a thickness of 20 to 100 N · c.
The gist of the present invention is to provide a strength that can be broken by a rotational torque of m.

According to a third aspect of the present invention, in the joint according to the first or second aspect, a seal is provided between an inner wall of the insertion space and an end of the resin pipe at an inner part of the insertion space. The gist is that the second sealing material is provided.

According to a fourth aspect of the present invention, there is provided the joint according to any one of the first to third aspects, further comprising a confirming means for confirming an insertion state of the resin pipe inserted into the insertion space. The gist is that

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention is described by using an end of a pipe constituting a water supply pipe and a polyolefin (crosslinked polyethylene,
An embodiment embodied in a joint for connecting an end of a resin pipe formed of a synthetic resin material such as polybutene will be described in detail with reference to the drawings. In addition, up, down, left and right in the following description correspond to up, down, left and right in FIG.

As shown in FIG. 1, the joint 11 has, at the left end, a pipe connecting portion 12 to which an end of the pipe (not shown) is connected, and a resin pipe P (see FIGS. 3 to 5). ) Has a pipe connection portion 13 to the right end. The resin pipe P is connected to the joint 11 by inserting an end of the resin pipe P into the joint 11 from the pipe connection portion 13, and a pipe (not shown) is fitted to the end of the pipe connection portion 12 by fitting the end to the pipe connection portion 12. It has become. As shown in FIGS. 1 and 3, the joint 11 includes a cylindrical main body 14, a nut 15, a split ring 16, a washer 17, a packing 18 as a first sealant, It comprises an O-ring 19 as a sealing material, a collar 20, and a shaft 21. Body 14, nut 15, split ring 16, and washer 1
7 is made of brass, the packing 18 and the O-ring 19 are made of an ethylene-propylene-diene copolymer, and the collar 20 and the shaft 21 are made of polyacetal.

The main body 14 is provided with two threads 2
2,23. The nut 15 is screwed to the right end of the main body 14, and the tube (not shown) is screwed to the left end of the main body 14. The inner peripheral surface at the right end of the main body 14 is a tapered surface 24 that approaches the outer peripheral surface of the main body 14 toward the right side. Further, a cylindrical inner cylindrical portion 25 is protruded inside the main body 14. The inner cylindrical portion 25 extends rightward from an inner peripheral surface of an intermediate portion of the main body 14 in the axial direction. An accommodation groove 26 for accommodating the packing 18 is provided at the right end of the inner cylindrical portion 25.
Is recessed. The accommodation groove 26 is formed over the entire circumference in the circumferential direction of the inner cylindrical portion 25. The accommodation groove 26 is
The inner bottom surface is formed to be inclined so that the depth becomes shallower toward the right side. There is an annular gap between the inner cylindrical portion 25 and the main body 14, and this gap serves as an insertion space 27 that allows insertion of the resin pipe P inserted from the pipe connection portion 13 into the joint 11.

The packing 18 housed in the housing groove 26
Has a ring shape, and the width thereof is formed smaller than the width of the accommodation groove 26. For this reason, the packing 18 is provided in the accommodation groove 2.
6 can be moved left and right. Packing 1
The outer peripheral surface of 8 is slightly projected from the accommodation groove 26 in any position in the accommodation groove 26. And
The packing 18 is pressed against and engaged with the inner peripheral surface of the resin pipe P externally fitted to the inner cylindrical portion 25, so that the resin pipe P
And the inner cylindrical portion 25 is sealed, and the resin pipe P is prevented from falling off.

The nut 15 has a thread 28 on the inner peripheral surface and an annular locking portion 29 extending radially inward from the right end. An adhesive layer (not shown) is partially interposed between the nut 15 and the threads 23 and 28 of the main body 14. The nut 15 is attached to the body 1
In a state where the main body 14 is not loosely tightened but slightly loosened with respect to the main body 14 by an adhesive layer (not shown).
Is adhered to. This adhesive layer (not shown)
The strength is set such that it can be broken by applying a rotational torque of 100 N · cm. Further, an adhesive layer (not shown) is formed by applying an adhesive, a sealant, or the like to the threads 23, 28.
It is formed by spotting in between.

The split ring 16 is fitted on the right end of the main body 14. The split ring 16 is formed in a substantially C-shape, and has a configuration in which the diameter can be reduced when a force is applied from the outside toward the radial inside. Also, the outer peripheral surface of the split ring 16
As it goes to the left side, it approaches the inner peripheral surface of the split ring 16 and has a tapered surface 16a at the left end that coincides with the inner peripheral surface.

The washer 17 is formed in a ring shape, and is interposed between the split ring 16 and the locking portion 29 of the nut 15. The O-ring 19 is disposed inside the insertion space 27. The inner wall of the insertion space 27 and the end of the resin pipe P inserted into the insertion space 27 are in close contact with each other to seal between them.

The collar 20 and the shaft 21 constitute checking means for checking the insertion state of the resin pipe P inserted into the insertion space 27. As shown in FIG. 2, the collar 20 is fitted in a through hole 30 formed in a radial direction at an intermediate portion of the main body 14. The through hole 30 is inserted into the insertion space 27 at a position corresponding to the inner portion of the insertion space 27.
It is formed so that it may communicate with. A step surface 30a is formed on the inner peripheral surface of the through hole 30, and a hole diameter above the step surface 30a is larger than a hole diameter below the step surface 30a. The collar 20 has a step surface 30a.
The upper part of the large diameter portion is fitted into the through hole 30. The collar 20 is formed in a cylindrical shape, and has a step surface 20a on an inner peripheral surface thereof. The step surface 20a
The inner diameter of the collar 20 above is smaller than the inner diameter of the collar 20 below.

On the other hand, the shaft 21 is formed in a substantially cylindrical shape. The lower end of the shaft 21 has a conical shape whose diameter decreases toward the bottom, and a tapered surface 31 as an inclined surface is formed at the lower end. A large diameter portion 32 is formed at an intermediate portion of the shaft 21 in the axial direction. The shaft 21 is disposed in the through hole 30 in a state of being fitted into the collar 20, and is configured to be able to move up and down in the through hole 30. This vertical movement of the shaft 21 is performed by moving the lower end surface of the large diameter portion 32 of the shaft 21 through the through hole 3.
0 and the large-diameter portion 32
Is restricted between a position where the upper end surface of the shaft 21 is engaged with the step surface 20 a of the collar 20, and an upper end of the shaft 21 is immersed in the through-hole 30 and a lower end projects from the through-hole 30 into the insertion space 27. And a position where the upper end of the shaft 21 projects outward from the through hole 30 and the lower end of the shaft 21 enters the through hole 30. Shaft 2
When the large diameter portion 32 is engaged with the step surface 30a of the through hole 30, the upper end surface of the shaft 21 and the outer peripheral surface of the main body 14 are flush. The outer peripheral surface of the shaft 21 is colored red. The outer peripheral surface of the shaft 21 that is colored red constitutes a visual recognition unit for improving visibility.

Next, the operation of the joint 11 configured as described above will be described. When the resin pipe P is connected to the pipe connection portion 13 of the joint 11, first, as shown in FIG. Then, the resin pipe P is pushed toward the inside of the joint 11. When the resin pipe P is pushed inward,
As shown in (b), the packing 18 moves in the accommodation groove 26 toward the left due to interference with the inner peripheral surface of the resin pipe P. As shown in FIG. 4C, the resin pipe P
When the resin pipe P is pushed inward, the end of the resin pipe P
1 is pressed against the tapered surface 31 at the lower end. Since the diameter of the tapered surface 31 is reduced toward the lower side, when pressure is applied from the side by the resin pipe P, the shaft 21 is moved upward, and the upper end of the shaft 21 is moved outward from the state of being immersed in the through hole 30. It is displaced to a state where it protrudes. As the resin pipe P is pushed in, the shaft 21 gradually moves upward, and as shown in FIG. 5A, when the resin pipe P is pushed in until the end abuts on the O-ring 19, the upper end of the shaft 21 projects. The amount is maximum.

The resin pipe P is connected to the joint 11 as described above.
After confirming that the upper end of the shaft 21 protrudes outward, the connection of the resin pipe P is completed by tightening the nut 15 as shown in FIG. 5B. When the nut 15 is tightened, the split ring 16 is pushed to the left via the washer 17 by the locking portion 29 of the nut 15, and the tapered surface 16 a of the split ring 16 engages with the tapered surface 24 of the main body 14 to split the split ring 16. 16 is reduced in diameter. As a result, the split ring 16 is pressed against and engaged with the outer peripheral surface of the resin pipe P, thereby preventing the resin pipe P from being accidentally dropped. At the same time, the end of the resin pipe P is further pressed into the inside of the joint 11 while being pinched by the split ring 16, so that the end of the resin pipe P is pressed against the O-ring 19 to exhibit the sealing property. .

If a force is applied to the resin pipe P inserted into the pipe connecting portion 13 of the joint 11 and the nut 15 is not yet tightened, the resin pipe P may interfere with the inner peripheral surface of the resin pipe P. Packing 18
6 move to the right. In this case, the accommodation groove 2 is formed so that the depth of the accommodation groove 26 becomes shallower toward the right side.
6, the amount of the packing 18 protruding from the inside of the accommodation groove 26 becomes larger than that of the case in which the packing 18 is located on the left side. Engage more strongly against the surface. For this reason, a larger resistance is generated at the time of extraction than at the time of insertion.

According to the above-described embodiment, the following effects can be obtained. When a force in the pulling direction acts on the resin pipe P inserted into the pipe connection portion 13 of the joint 11, the resin pipe P
The packing 18 moves rightward in the accommodating groove 26 so as to follow the movement of. However, in this case, the accommodation groove 2
Since the packing 18 that has moved to the right in the inside 6 is strongly pressed against and engaged with the inner peripheral surface of the resin pipe P, a large resistance is generated, so that a relatively large force is required for pulling out. For this reason, even if the nut 15 is not stopped by the split ring 16 by the tightening of the nut 15, the resin pipe P is unlikely to fall off carelessly, and the end of the resin pipe P is securely inserted into the insertion space 27. Can be fixed.

Conversely, when the resin pipe P is inserted into the insertion space 27, the packing 18 moves in the accommodation groove 26 leftward so as to follow the movement of the resin pipe P. In this case, since the packing 18 is pressed against the inner peripheral surface of the resin pipe P with a smaller force than at the time of drawing, the resin pipe P can be inserted with a smaller force than at the time of drawing. Therefore, it is possible to secure the ease of insertion of the resin pipe P while improving the reliability of the temporary fixing of the resin pipe P.

The nut 15 is adhered to the main body 14 by an adhesive layer (not shown), and the adhesive layer (not shown) is set to a strength that can be broken by applying a rotational torque of 20 to 100 N · cm. Have been. For this reason, it is possible to suppress the possibility that the nut 15 will fall off the main body 14 due to vibration during transportation or the like. Further, the resin pipe P is strong enough to be easily broken by rotating the nut 15 by hand or tool.
After inserting the end of the
There is no possibility that the adhesive layer (not shown) causes any particular trouble when tightening.

The nut 15 is adhered to the main body 14 by an adhesive layer (not shown) in a state in which the nut 15 is slightly loosened but not tightly fixed to the main body 14. For this reason, when connecting the resin pipe P, it is not necessary to once loosen the nut 15 again, and the end of the resin pipe P can be inserted into the pipe connection portion 13 as it is, thereby facilitating the connection work. it can.

In addition to the seal 18 ensuring the sealing performance between the inner peripheral surface of the resin pipe P and the outer peripheral surface of the inner cylindrical portion 25, the O-ring 19 further secures the end of the resin pipe P Since the sealing property is ensured even with the inner wall of the insertion space 27, a high sealing property can be exhibited as a whole.

After completion of the connection work, the state of insertion of the resin pipe P can be grasped by checking the shaft 21. Therefore, even if there is a connection failure, it can be found immediately, and various problems associated with the connection failure can be found. Can be suppressed.

The state of insertion of the resin pipe P can be determined by checking whether or not the upper end of the shaft 21 is protruding outward, and how much the shaft 21 protrudes. The insertion state of the resin pipe P can be accurately and easily determined as compared with the conventional one in which the end of the pipe P is looked into and confirmed.

Even if the work site is in a dark place, it is possible to confirm whether or not the upper end of the shaft 21 projects outward by touching with a hand. The lower end of the shaft 21 is formed with a tapered surface 31 whose diameter decreases toward the bottom, and the end of the resin pipe P interferes with the tapered surface 31 so that even if the shaft 21 rotates. However, the upper end of the shaft 21 can be reliably protruded and retracted according to the inserted state.

The component constituting the confirmation means is the color 20
And the shaft 21, the assembling work is easy, and the parts management is also easy. In the case of the present embodiment, the step surface 20 a for restricting the upward movement of the shaft 21 is provided not on the inner peripheral surface of the through hole 30 but on the collar 20 fitted in the through hole 30. When the step surface 20a is provided on the inner peripheral surface of the through hole, it is necessary to form the hole diameter above the step surface 20a smaller than the hole diameter below the step surface 20a.
Its processing is not easy. However, in the case of the present embodiment,
By providing the step surface 20a on the collar 20, it is possible to avoid such difficult processing as described above. The shaft 21
In this embodiment, the step surface 30a for restricting the downward movement of the through hole 30 is provided on the inner peripheral surface of the through hole 30, but the processing is not particularly difficult.

Since the outer peripheral surface of the shaft 21 is colored red, visibility when the upper end of the shaft 21 protrudes outward can be improved, and it is possible to accurately and easily determine the insertion state of the resin pipe P. Performance can be improved.

In the case of the present embodiment, the packing 18
The sealing property is secured between the inner peripheral surface of the resin pipe P and the outer peripheral surface of the inner cylindrical portion 25 by the sealing, and the sealing property between the end of the resin pipe P and the inner wall of the insertion space 27 is secured by the O-ring 19. Is secured. Therefore, there is no danger of water leakage without providing a seal mechanism between the outer peripheral surface of the collar 20 and the inner peripheral surface of the through hole 30 or between the inner peripheral surface of the collar 20 and the outer peripheral surface of the shaft 21. The configuration according to the means can be simplified.

The above embodiment can be modified as follows. The checking means in the above embodiment is composed of the collar 20 and the shaft 21. Instead, a checking hole or a transparent portion is provided in the main body 14 as checking means, and the insertion space is inserted through the checking hole or the transparent portion. The end of the resin pipe P inside 27 may be made visible.

Next, the technical ideas that can be grasped from the above embodiment will be described below. The joint according to any one of claims 1 to 4, wherein the first seal member protrudes from the accommodation groove at any position in the accommodation groove. In the case of such a configuration, it is possible to reliably exhibit the sealing property between the inner peripheral surface of the resin pipe and the outer peripheral surface of the inner cylindrical portion.

The checking means comprises a cylindrical collar inserted into a through hole formed in the peripheral wall of the main body so as to communicate with the insertion space, and a shaft inserted into the collar. An inclined surface is provided at the inner end of the shaft so as to face the end of the pipe inserted into the insertion space, and the shaft is disposed so that the inner end protrudes into the insertion space. The structure according to claim 4, wherein the end of the pipe inserted into the space interferes with the inclined surface, whereby the shaft is moved outward, and the outer end of the shaft is protruded from the outer peripheral surface of the main body. The described joint. With this configuration, the insertion state of the resin pipe can be accurately and easily determined.

The joint according to any one of claims 1 to 4, wherein the inner cylindrical portion is formed integrally with the main body. In the case of such a configuration, the number of parts can be reduced, and assembling work and parts management can be facilitated.

[0037]

Since the present invention is configured as described above, it has the following effects. According to the first aspect of the present invention, the end of the resin pipe can be reliably temporarily fixed in the insertion space.

According to the invention described in claim 2, according to claim 1
In addition to the effects of the invention described in (1), it is possible to suppress the possibility that the nut is inadvertently dropped due to vibration during transportation. According to the third aspect of the invention, in addition to the effects of the first or second aspect of the invention, it is possible to improve the sealing performance.

According to the invention set forth in claim 4, according to claim 1,
In addition to the effect of the invention described in any one of the third to third aspects, the insertion state of the resin pipe can be confirmed, so that even if there is a connection failure, it can be found immediately.

[Brief description of the drawings]

FIG. 1 is a half sectional view showing a joint according to an embodiment.

FIG. 2 is an enlarged sectional view showing a main part of the joint.

FIG. 3 is an exploded perspective view showing a joint.

FIGS. 4A to 4C are cross-sectional views of a main part showing a use state of the joint.

FIGS. 5A and 5B are half cross-sectional views showing a use state of the joint.

[Description of Signs] 11 ... joint, 14 ... body, 15 ... nut, 16 ... split ring, 18 ... packing as first sealant, 19 ... second
O-ring as seal material, 20: collar constituting confirmation means, 21: shaft constituting confirmation means, 25: inner cylinder, 26 ... accommodation groove, 27: insertion space, P: resin pipe.

Claims (4)

[Claims] 1. A main body having a cylindrical shape and having an insertion space therein for allowing insertion of an end of a resin pipe, a resin pipe protruding into the main body and inserted into the insertion space. An inner cylindrical portion, a split ring fitted to one end of the main body, and a nut screwed to one end of the main body, wherein the split ring is reduced in diameter as the nut is tightened. At the joint where the split ring engages with the outer peripheral surface of the resin pipe in the insertion space to prevent the end of the resin pipe from falling into the insertion space, the inner bottom surface is inclined so that the depth decreases toward the outside The recessed housing groove is recessed in the outer peripheral surface of the inner cylindrical portion, and the inside of the housing groove is movable in the housing groove along the insertion / removal direction of the resin pipe and the inside of the resin pipe inserted into the insertion space. A first sealing material which is pressed against and engaged with the peripheral surface is housed therein. When inserting the resin pipe into the insertion space, the amount of the first seal material protruding from the accommodation groove is reduced by moving the first seal material along the insertion direction following the resin pipe, and when the resin pipe is pulled out, A joint characterized in that an amount of the first seal material protruding from the accommodation groove is increased by moving the first seal material in a pulling-out direction following the resin pipe. 2. An adhesive layer is provided between the main body and the nut so as to adhere the two to each other, and the adhesive layer has a thickness of 20 to 100 N · cm.
The joint according to claim 1, wherein the joint has a strength that can be broken by the rotational torque. 3. A second sealing material for sealing between an inner wall of the insertion space and an end of the resin pipe is provided at an inner part of the insertion space. 3. The joint according to 2. 4. The joint according to claim 1, further comprising a confirmation unit for confirming an insertion state of the resin pipe inserted into the insertion space.