JP2013238293A - Joint for piping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive joint for piping with high reliability by using a resin material as a main material.SOLUTION: A piece of resin piping 7 to be connected is inserted into a cylinder insertion part 2a of a joint body 1 formed of a resin, and the resin piping 7 is fixed by being engaged with a projection part 4b of a metal connection ring 4 stored in a groove formation part 2b, compressing a compression ring 8 provided on an outer peripheral part of the resin piping 7 with a compressor not shown in the figure, and caulking the resin piping 7 with the connection ring 4 while a gap S of size G is radially provided with the groove formation part 2b. The metal connection ring 4 receives swaging force swaging the resin piping 7, and in addition, a little deformation of a radial direction of the connection ring 4 in swaging is absorbed with the gap S. Since the swaging force is not applied on the cylinder insertion part 2a, aging degradation of the swaging force due to creep or the like of the resin material can be prevented, reliability is high, and the joint body 1 can be made of the resin at an inexpensive price and processing cost.

Description

  The present invention relates to a pipe joint used for connecting a resin pipe such as a three-layer pipe including a metal layer in an intermediate layer.

  Resin piping including a three-layer pipe having a metal layer as an intermediate layer is widely used in water supply and hot water supply pipes and underfloor pipes of floor heating systems. Typical types of joints used for connecting the resin pipes include a compression type, a tightening type, and a plugging type. Among these systems, compression type joints are widely used because of their reliability and ease of handling. Among them, a metal composite resin tube is inserted into a gap between a joint main body formed of metals or hard resin and a compression ring provided to cover the main body, and the compression ring is compressed and deformed. , The joint of the compression ring is bent to the joint side, and the end of the compression ring is inserted into the compression ring insertion groove on the back side of the joint body, and compressed. An annular member made of an elastic body is press-fitted between the inner peripheral surface of the ring bent portion and the wall surface of the insertion groove. When the annular member is press-fitted, both wall surfaces are pressed, and the outer peripheral surface of the compression ring and the insertion groove wall surface Increase in the frictional force between the compression ring and the compression ring attached to the joint body (see, for example, Patent Document 1).

JP 2006-125523 A

  A joint as a conventional joint for piping is configured as described above, and an annular protrusion for preventing an O-ring mounting groove and a resin pipe (metal composite resin pipe) from coming off on the outer peripheral surface of the joint. After the resin pipe and the compression ring are inserted into the connection joint, the bent part side end of the compression ring is inserted into the compression ring insertion groove on the inner side of the joint body, and the compression ring outer peripheral surface and the compression ring insertion groove are inserted. The compression ring is held by increasing the frictional force with the wall, and the compression ring is compressed and caulked, and the O-ring attached to the outer periphery of the connection joint is compressed to ensure water-stopping performance. It is considered that the inner surface of the resin pipe bites into an annular protrusion provided on the outer peripheral portion of the joint, and from this point also, the resin pipe can be prevented from dropping off from the joint. When a metal material is used for the joint body of such a compression joint, it is often manufactured by cutting. This is because when the resin pipe is fixed to the joint by caulking, a compressive load is inevitably applied to the joint, so that the material forming the joint is required to have creep resistance. Although metal joints exhibit characteristics that are not problematic in terms of creep resistance, there is a problem in that joints cannot be manufactured at low cost because of high material costs and processing costs. On the other hand, by forming the joint with a resin material typified by polyphenylene sulfide (PPS) resin, the problem of material cost and processing cost can be solved at the same time. Because of its low creep proof strength, it was difficult to put a joint made entirely of a resin material into practical use.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain an inexpensive and highly reliable joint for piping that uses a resin material as a main material.

In the joint for piping according to the present invention,
A pipe joint comprising a joint body having an insertion portion and a crimping force receiving member,
The joint body is made of resin, and the insertion portion has a cylindrical insertion portion,
The caulking force receiving member has a caulking force receiving member cylindrical portion formed of metal,
The clamping force receiving member is disposed in the cylindrical insertion portion, the cylindrical insertion portion is inserted into a resin pipe to be connected, and a crimping member provided on an outer peripheral portion of the resin pipe is compressed by a compression device. The resin pipe is fixed by caulking the resin pipe with a caulking member and the caulking force receiving member.

This invention
A pipe joint comprising a joint body having an insertion portion and a crimping force receiving member,
The joint body is made of resin, and the insertion portion has a cylindrical insertion portion,
The caulking force receiving member has a caulking force receiving member cylindrical portion formed of metal,
The clamping force receiving member is disposed in the cylindrical insertion portion, the cylindrical insertion portion is inserted into a resin pipe to be connected, and a crimping member provided on an outer peripheral portion of the resin pipe is compressed by a compression device. Since the resin pipe is fixed by caulking the resin pipe with a caulking member and the caulking force receiving member,
An inexpensive and highly reliable joint for piping that uses a resin material as a main material can be obtained.

It is sectional drawing which shows the structure of the state which connected the resin piping to the coupling for piping by Embodiment 1 of this invention. It is sectional drawing which shows the structure of the coupling for piping of FIG. It is explanatory drawing which shows the dimensional relationship of the coupling for piping of FIG. 6 is a cross-sectional view showing a configuration of a connection ring according to a second embodiment. FIG. 6 is a cross-sectional view illustrating a configuration of a joint for piping according to a third embodiment. FIG. 6 is a cross-sectional view showing a configuration in which a resin pipe is connected to a pipe joint according to Embodiment 3. FIG. FIG. 10 is a cross-sectional view showing a configuration of a joint for piping which is a fourth embodiment.

Embodiment 1 FIG.
1 to 3 show a first embodiment for carrying out the present invention, and FIG. 1 is a cross-sectional view showing a configuration in a state where a resin pipe is connected to a pipe joint according to the first embodiment. 2 is a cross-sectional view showing the configuration of the piping joint of FIG. 1, and FIG. 3 is an explanatory diagram showing the dimensional relationship of the piping joint of FIG. In these drawings, a joint 10 as a joint for piping has a joint body 1 made of resin and a connection ring 4 made of metal. The joint body 1 has an insertion part 2 and a quick joint part 3. The insertion portion 2 includes a cylindrical insertion portion 2a having a tapered tip, and a first groove forming an annular groove having a rectangular cross section in which a connection ring 4 (described later) provided in the cylindrical insertion portion 2a is accommodated. It has the formation part 2b, the 2nd groove formation part 2c which forms the cyclic | annular groove | channel of rectangular cross section in which the O ring 5 is mounted | worn, and the inner peripheral side coating | coated part 2f.

  As shown in FIG. 3 (b), the connection ring 4 as a clamping force receiving member has a so-called bamboo shoot shape that is widely used as a joint structure for resin piping and rubber piping. A connecting ring cylindrical portion 4a having an inner diameter Di and an outer diameter Db as a portion, and a protruding portion 4b (three places) having an annular diameter D0 having a right-angled triangular section protruding from the connecting ring cylindrical portion 4a. . And the connection ring 4 is accommodated in the 1st groove | channel formation part 2b so that the protrusion part 4b may protrude in the radial direction from the cylindrical insertion part 2a. The connection ring 4 is composed of two semi-cylindrical members having a semicircular cross section that is divided into two linearly in the axial direction in order to be accommodated in the first groove forming portion 2b. These two semi-cylindrical members are mounted and combined so as to sandwich the first groove forming portion 2b to form a cylindrical connection ring 4. The semi-cylindrical member is not limited to the one that is divided linearly in the above-described axial direction, and the shape of the cutting line is changed to a V shape by shifting the central portion of the axial direction to the left or right, or two semi-cylindrical members A fitting part may be provided in the contact part. An O-ring 5 as a sealing member is accommodated in the second groove forming portion 2c. The insertion portion 2 is inserted into the resin pipe 7, and the resin pipe 7 is fixed in a state of being crimped by a compression ring 8 and a connection ring 4 as crimping members provided on the outer peripheral side thereof.

Note that the joint body 1 and the connection ring 4 are configured such that the dimensional relationship of each part indicated by the reference numerals in FIGS. 3A and 3B satisfies the following conditions a to d.
Condition a: The inner diameter Di of the connection ring 4 is larger by the dimension G × 2 than the bottom diameter (the diameter of the bottom surface of the groove formed by the first groove forming portion 2b) D1 of the first groove forming portion 2b. That is, Di−D1 = 2G, and a gap S having a radial dimension G is secured between the two.
Even if the connection ring 4 is distorted when compressing the compression ring 8 (described later), the compression ring 8 is absorbed by the gap S, so that a compressive force is applied to the cylindrical insertion portion 2a of the joint body 1 via the first groove forming portion 2b. There is no.
Condition b: The outer diameter of the connecting ring cylindrical portion 4a, that is, the diameter Db of the valley portion of the connecting ring 4 is larger than the outer diameter Dt of the cylindrical insertion portion 2a of the joint body 1, and the inner diameter before compression of the resin pipe 7 to be used smaller than d (Dt <Db <d).
By making the diameter Db of the valley part larger than the outer shape Dt of the cylindrical insertion part 2a, even if the projecting part 4b provided on the connecting ring cylindrical part 4a is crushed when compressed by the compression ring 8, the outer diameter Db or less. Therefore, when the compression ring 8 is compressed, it is possible to prevent the compressive force from being applied to the cylindrical insertion portion 2a of the resin joint body 1 through the resin pipe 7, and the reliability of the joint can be ensured.

Condition c: The inner diameter Di of the connection ring 4 is smaller than the outer diameter Dt of the cylindrical insertion portion 2a of the joint body 1 (Di <Dt).
This is to prevent the connection ring 4 from falling off.
Condition d: The outer diameter Db of the connecting ring cylindrical portion 4a is a dimension Do obtained by subtracting twice the crushing rate 10% of the O-ring 5 to be used from the outer diameter Do (not shown) of the O-ring 5 to be used. It is smaller than (1-0.2) and larger than the outer diameter dimension (outer diameter dimension of the cylindrical insertion portion 2a) Dt of the second groove forming portion 2c that accommodates the O-ring 5 (Dt <Db <Do (1). -0.2)).
This is to ensure a crushing rate of 10%.
In addition, the outer diameter D1 of the bottom part of the 2nd groove | channel formation part 2c can ensure the crushing rate of the O-ring 5, for example 10%. The second groove forming portion 2c forms an annular groove having a depth H (= (Dt−D1) / 2) that is recessed from the surface of the cylindrical insertion portion 2a.

  In order to connect the resin pipe 7 to the joint 10, the resin pipe 7 and the compression ring 8 are inserted in a state in which the connection ring 4 and the O-ring 5 are attached to the cylindrical insertion portion 2 a of the joint body 1, and compression (not shown) is performed. The part located on the connection ring 4 of the compression ring 8 is compressed by the apparatus, and the resin pipe 7 is crimped and fixed by the compression ring 8 and the connection ring 4. The compression of the compression ring 8 at that time is performed under the condition of a compression force that does not eliminate the gap S existing between the connection ring 4 and the bottom surface of the first groove forming portion 2 b of the joint body 1. As a result, the projecting portion 4b of the connection ring 4 bites into the inner peripheral portion of the resin pipe 7, and is strongly engaged with the inner peripheral portion of the resin pipe 7, so that the resin pipe 7 is dropped from the cylindrical insertion portion 2a of the insertion portion 2. To prevent. The O-ring 5 is compressed to a crushing ratio of 10% by the resin pipe 7 and seals between the cylindrical insertion portion 2 a and the resin pipe 7, and has a sealing function for the fluid flowing inside the resin pipe 7. The inner peripheral side covering portion 2 f has a function of preventing the connection ring 4 from coming into contact with the fluid flowing inside the resin pipe 7. Further, by adopting the structure of the connection ring 4 that satisfies the above conditions, a compression load for fixing the resin pipe 7 to the joint body 1 made of resin, that is, the cylindrical insertion portion 2a is not applied, and reliability is improved. High product life can be greatly improved. As a result, it is possible to replace the main material of the joint from an expensive metal material to a resin material, the joint can be easily manufactured by resin molding or the like, and a significant reduction in joint cost can be realized.

Embodiment 2. FIG.
FIG. 4 is a cross-sectional view showing a configuration of a connection ring according to the second embodiment. The shape of the connection ring 14 serving as a crimping force receiving member that receives a compressive force when the resin pipe 7 is crimped is the shaft of a cylindrical connection ring cylindrical portion 14a serving as a crimping force receiving member cylindrical portion as shown in FIG. It may have a groove-like cross section in which hook-like portions 14b as projecting portions are provided at both ends in the direction. Since the purpose of the connecting ring is to prevent the resin pipe from coming off, the same effect can be obtained even with a cylindrical shape with a flange as shown in FIG.

Embodiment 3 FIG.
5 and 6 show the third embodiment. FIG. 5 is a cross-sectional view showing a configuration of a piping joint, and FIG. 6 is a cross-sectional view showing a configuration in which a resin pipe is connected to the piping joint. is there. In these drawings, a joint 20 as a pipe joint includes a joint body 21 made of resin, a cylindrical caulking force receiving member made of metal, and an insert part 24 as a caulking force receiving member cylindrical portion. And have. The joint body 21 includes an insertion portion 22 and a quick joint portion 3. The insertion portion 22 includes a cylindrical insertion portion 22a having a tapered tip, a second groove forming portion 22c having a rectangular cross section on which the O-ring 5 is mounted, and an outer peripheral portion of the insert component 24 of the cylindrical insertion portion 22a. An outer peripheral side covering portion 22d, which is a portion located at the outer peripheral side covering portion 22d, and a projecting portion 22e as an annular engaging protruding portion having a right-angled triangular cross section provided by projecting from the outer peripheral side covering portion 22d; And a peripheral covering portion 22f. The metal insert part 24 is completely embedded in a state in which the entire periphery is covered with resin so as not to be exposed to the outer peripheral side or the inner peripheral side of the cylindrical insertion part 22a. ) Since other configurations are the same as those of the first embodiment shown in FIG. 1, the same reference numerals are given to the corresponding components and the description thereof is omitted.

  In order to connect the resin pipe 7 to the joint 20, the resin pipe 7 and the compression ring 8 are inserted in a state where the O-ring 5 is attached to the cylindrical insertion portion 22 a of the joint body 21, and the compression ring 8 is connected by a compression device (not shown). The part located on the insert part 24 is compressed, and the outer peripheral side covering part 22d and the protruding part 22e are crimped and fixed by the compression ring 8 and the insert part 24. Accordingly, the protruding portion 22e provided on the cylindrical insertion portion 22a is firmly engaged with the inner peripheral portion of the resin pipe 7 to prevent the resin pipe 7 from dropping from the cylindrical insertion portion 22a of the insertion portion 22. The O-ring 5 is compressed by the resin pipe 7 to a crushing rate of 10%, seals between the cylindrical insertion portion 22a and the resin pipe 7, and has a sealing function for fluid flowing inside the resin pipe 7.

  As described above, when the outer peripheral side covering portion 22d and the projecting portion 22e are compressed and crimped by the compression ring 8, the insert component 24 receives the compressive force, thereby improving the rigidity and creep resistance of the joint 20. Therefore, the joint body 21 can be formed of a resin material. The insert component 24 is not inserted so as to be exposed on the outermost surface of the cylindrical insertion portion 22a of the joint body 21. As a result, the protruding portion 22e for preventing the resin pipe 7 from falling off can be formed integrally with the resin material, so that it is not necessary to form it with a metal part, and the processing cost of the insert part 24 is reduced. It becomes possible to provide.

  Moreover, it is preferable to arrange | position the insert component 24 in the position which is not exposed also to the inner surface side of the cylindrical insertion part 22a. That is, it is preferable to completely embed in the resin forming the cylindrical insertion portion 22a. This is because when the insert part 24 is exposed to the inside of the joint body 21, the metal material forming the insert part 24 comes into direct contact with the fluid flowing inside, and measures against corrosion such as erosion are taken. This is because there is a possibility that the material may be necessary or the material that can be used is restricted. Therefore, by adopting a structure in which the insert component 24 is not exposed to the inner and outer surfaces of the joint body 21, it is possible to realize the joint 20 that is more reliable and safer than the joint 10 shown in the first embodiment. .

Embodiment 4 FIG.
FIG. 7 is a cross-sectional view showing the configuration of the joint for piping according to the fourth embodiment. In FIG. 7, a joint 30 as a pipe joint has a spacer 31 as a deformable member that can be deformed in the radial direction. The spacer 31 is formed in a cylindrical shape with an elastic material that can be compressed in a radial direction by a predetermined predetermined dimension. The spacer 31 fills the cylindrical gap S having a dimension G formed between the connection ring 4 and the first groove forming portion 2b (the bottom surface of the groove formed by the joint 10 shown in FIG. 1). In this way, it is provided. Since other configurations are the same as those of the first embodiment shown in FIG. 1, the same reference numerals are given to the corresponding components and the description thereof is omitted. When the joint body 1, that is, the cylindrical insertion portion 22a and the connection ring 4 are integrally formed by resin molding, the first groove forming portion 2b is formed at the time of molding by inserting the spacer 31 on the inner diameter side of the connection ring 4 and resin molding. And the connection ring 4 can prevent the resin from flowing in, and the manufacturing becomes easy. The spacer 31 only needs to be deformable in the radial direction, and is not limited to an elastic material.

In the first embodiment, the gap S having the dimension G is provided between the first groove forming portion 2b and the connection ring 4. However, the gap S is not essential, and the connection ring 4 is not essential. The necessity and dimension G may be determined in consideration of the strength of the sheet, the required compression force during caulking, the hardness of the material of the resin pipe 7, and the like. Moreover, in each said embodiment, although the connection method with another component was shown in the quick joint part 3, the case of a screw-in type and a one-touch type may be sufficient.
In addition, the number of the groove forming portions 2c and 22c for mounting the O-ring 5 shown in FIGS. 1, 5, and 7 is one, but the number of O-rings and groove forming portions is limited to one. is not. There may be two or more, and the design is made according to conditions such as the temperature and pressure of the internal fluid to be used.

  In the present invention, the above-described embodiments can be freely combined within the scope of the invention, or each embodiment can be appropriately changed or omitted.

DESCRIPTION OF SYMBOLS 1 Joint main body, 2 insertion part, 2a Cylindrical insertion part, 2b 1st groove formation part,
2c 2nd groove formation part, 2f inner peripheral side coating | coated part, 4 connection ring,
4a connecting ring cylindrical part, 4b projecting part, 5 O ring, 7 resin piping,
8 compression ring, 10 joint, 14 connection ring, 14a connection ring cylindrical part,
14b bowl-shaped part, 20 joint, 21 joint body, 22 insertion part, 22a cylindrical insertion part,
22c 2nd groove formation part, 22d outer peripheral side coating | coated part, 22e protrusion part,
22f Inner peripheral side covering part, 24 insert parts, 30 joint, 31 spacer.

Claims (6)

A pipe joint comprising a joint body having an insertion portion and a crimping force receiving member,
The joint body is made of resin, and the insertion portion has a cylindrical insertion cylindrical portion,
The caulking force receiving member has a caulking force receiving member cylindrical portion formed of metal,
The clamping force receiving member is disposed in the insertion cylindrical portion, the cylindrical insertion portion is inserted into a resin pipe to be connected, and a crimping member provided on an outer peripheral portion of the resin pipe is compressed by a compression device. A pipe joint for fixing the resin pipe by crimping the resin pipe with a caulking member and the caulking force receiving member. The cylindrical insertion portion is provided with a first groove forming portion on an outer peripheral portion thereof,
The caulking force receiving member has a caulking force receiving member cylindrical portion and an annular projecting portion projecting radially from the caulking force receiving member cylindrical portion,
The caulking force receiving member is provided with a deformable member that is radially deformable with a gap in the radial direction with respect to the first groove forming portion, and the protruding portion is more in the radial direction than the first groove forming portion. The joint for piping according to claim 1, wherein the joint for piping is accommodated in the first groove forming portion so as to protrude. The cylindrical insertion portion has an outer peripheral covering portion that covers the crimping force receiving member so that the crimping force receiving member is not exposed to the outer peripheral side of the cylindrical insertion portion, and projects in a radial direction from the outer peripheral covering portion. Having an annular engagement protrusion provided,
The pipe joint according to claim 1, wherein the resin pipe is caulked with the caulking member and the caulking force receiving member via the outer peripheral side covering portion and the engagement projecting portion. The said cylindrical insertion part has an inner peripheral side coating | coated part which covers the said crimping force receiving member so that the said crimping force receiving member may not be exposed to the inner peripheral side of the said cylindrical insertion part. 4. The joint for piping according to any one of 3 above. Having a sealing member,
The cylindrical insertion portion is provided with a second groove forming portion on the outer peripheral portion thereof,
The sealing member is accommodated in the second groove forming portion,
5. The crimping force receiving member according to claim 1, wherein an outer diameter of the cylindrical portion of the crimping force receiving member is larger than an outer diameter of the first groove forming portion. The joint for piping described in 2. The sealing member is an O-ring;
The O-ring is accommodated in the second groove forming portion,
The crimping force receiving member has a crushing rate of 2 required for the O-ring from the outer diameter of the O-ring accommodated in the second groove forming portion. The piping joint according to claim 5, wherein the joint is smaller than a value obtained by subtracting double and larger than an outer diameter of the second groove forming portion.

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