JP7323288B2 - pipe joint - Google Patents

Description

The present invention relates to pipe joints.

2. Description of the Related Art Conventionally, pipe joints have been used to connect pipes for water supply, hot water supply, or air conditioners in buildings. As such a pipe joint, for example, as shown in Patent Document 1 below, a seal member is housed in a housing groove portion provided on the inner peripheral surface of the joint body, and the seal member contacts the outer surface of the pipe inserted inside the joint body. A configuration is known in which water is stopped by contact.
Since this pipe joint stops water on the outer peripheral surface of the pipe, it is easier to secure the spatial volume inside the pipe than when the water is stopped on the inner peripheral surface of the pipe. can be reduced.

JP-A-2004-68923

However, in the conventional pipe joint described above, the accommodation groove is formed in the inner peripheral surface of the joint body. For this reason, the shape of the joint body becomes complicated, which makes it difficult to remove the mold during production by injection molding, or requires additional processing to form an accommodation groove on the inner peripheral surface of the joint body. had room for improvement.

The present invention has been made in view of the above-mentioned circumstances, and it is possible to secure the space volume in the pipe, reduce the pressure loss due to the connection between the pipe and the joint body, and easily manufacture with a simple structure. An object of the present invention is to provide a pipe joint that can

In order to solve the above problems, the present invention proposes the following means.
A pipe joint according to the present invention includes a tubular joint body having a housing recess formed on the inner peripheral surface of an open end, and an opening attached to the open end and coaxial with the open end. a sealing member that is housed in the housing recess and abuts against the outer peripheral surface of the pipe that is inserted into the joint body from the opening end; the opening end; and the top of the bushing. a retaining ring disposed in a gap provided between a wall portion and extending in an axial direction along the central axis of the joint body to prevent the pipe from coming off; and the retaining ring placed in the gap. a fixing member disposed on the opposite side of the top wall portion sandwiching the top wall portion in the axial direction and fixing the seal member to the joint body, and an outer surface of the fixing member facing inward in the axial direction An engaging ring portion protruding inward in the axial direction is formed on the inner end surface, and the engaging ring portion is fitted inside the open end portion. A bowl-shaped recess recessed toward the inner side in the axial direction is formed on the outer end face facing the outer side in the axial direction, and the bowl-shaped recessed portion protrudes toward the inner side in the axial direction in a vertical cross-sectional view. A portion of the outer end surface of the fixing member, which is formed in a curved surface shape and is continuous with the bowl-shaped concave portion from the outside in the radial direction, sandwiches the retaining ring in the axial direction between itself and the top wall portion. 2. A pipe joint according to claim 1, wherein a locking ring portion is formed on a radially inner side of said retainer ring and extends gradually inwardly in said axial direction as it goes radially inwardly.
The locking ring portion may be arranged inside the bowl-shaped concave portion.

According to this invention, the seal member is accommodated in the accommodation recess formed in the inner peripheral surface of the open end of the joint body, and this seal member contacts the outer surface of the pipe inserted inside the joint body.
For this reason, compared to a configuration in which a seal member is provided inside the pipe to stop water between the joint body and the pipe, the space volume in the pipe is secured, and the pressure loss due to the connection between the pipe and the joint body is reduced. can be reduced.

A fixing member is arranged in an axial gap formed between the open end of the joint body and the top wall of the bush, and the fixing member fixes the seal member accommodated in the accommodation recess. ing.
For this reason, it is possible to form the accommodation recess in a state of being open in the axial direction. A recess can be easily formed.
As described above, it is possible to easily manufacture the pipe joint with a simple structure while securing the space volume in the pipe and reducing the pressure loss due to the connection between the pipe and the joint body.

Further, the joint main body may have transparency to the extent that the pipe can be visually recognized from the outside.
In this case, since the joint body is permeable, the pipe inserted into the joint body from the open end can be visually recognized from the outside. Thus, in the work of connecting the pipe to the joint body, it is possible to reliably grasp that the pipe has been inserted into the joint body by a specified length.

Also, the bush does not have to be transparent enough to allow the pipe to be visually recognized from the outside.

In this case, since the bush is not permeable, the pipe inserted into the joint body cannot be seen from the outside in the portion of the joint body where the bush is attached from the outside in the radial direction. .
Therefore, it is possible to visually recognize the pipe from the outside only when the pipe is inserted deeper than the bush in the insertion direction inside the joint body, and it is possible to reliably grasp that the pipe is properly inserted. be able to.

Further, the joint main body may include a mounting tubular portion to which the bush is attached from the radially outer side, and a support tubular portion that supports the mounting tubular portion.
In this case, the bush attached to the mounting tube makes it impossible to visually recognize the pipe positioned inside the mounting tube.
For this reason, it is possible to see the pipe from the outside only after the pipe is inserted inside the support cylinder located on the far side in the insertion direction of the bush, and it is possible to confirm that the pipe is properly inserted. can be grasped.

Further, the accommodation recess may be formed on the inner peripheral surface of the mounting cylinder.
In this case, since the housing recess is formed in the inner peripheral surface of the mounting cylinder, the sealing member housed in the housing recess cannot be visually recognized from the outside. Therefore, misidentification of the seal member as a pipe inserted inside the joint body can be prevented.

Further, an inner cylindrical body may be provided which is inserted into an end portion of the pipe and suppresses radially inward deformation of the pipe.
In this case, by inserting the pipe inside the joint main body while the inner cylindrical body is inserted into the end portion of the pipe, it is possible to suppress the pipe from being deformed inward in the radial direction.

In addition, the inner cylindrical body includes an insertion cylinder portion extending along the pipe, and a tip end flange portion connected to an end portion of the insertion cylinder portion and protruding radially outward. The color of each of the portion and the tip flange portion may be different from each other.

In this case, of the inner cylinder, the tip flange portion connected to the end of the insertion cylinder portion and the insertion cylinder portion extending along the pipe have different colors. Therefore, it is possible to improve the identifiability of each part and efficiently perform the construction work.

Further, a sliding member is disposed between the retainer ring and the top wall of the bush in the axial direction , and when the pipe inserted into the joint body is rotated in the circumferential direction, the A slide member may rotate in a circumferential direction with respect to the retainer ring, and the retainer ring may rotate together with the pipe .
In this case, the slide member is arranged axially between the retainer ring and the top wall of the bush. Therefore, by reducing the frictional resistance between the sliding member and the retaining ring , the sliding member can rotate in the circumferential direction with respect to the retaining ring .
As a result, when the pipe inserted into the joint main body is rotated in the circumferential direction, the retainer ring can rotate together with the pipe, and the pipe can be prevented from coming off from the retainer ring .

ADVANTAGE OF THE INVENTION According to this invention, it can manufacture easily with a simple structure, maintaining high watertightness.

BRIEF DESCRIPTION OF THE DRAWINGS It is a partial cross-section front view of the pipe joint which concerns on 1st Embodiment of this invention. It is (a) a top view in the retainer ring shown in FIG. 1, (b) It is a longitudinal cross-sectional view. It is front sectional drawing of the pipe joint which concerns on 2nd Embodiment of this invention. It is front sectional drawing of the pipe joint based on the modification of this invention. FIG. 8A is a cross-sectional front view, and FIG. 8B is a plan view seen from the axial direction of a spacer member in a pipe joint according to a third embodiment of the present invention; It is a cross-sectional front view of the pipe joint which concerns on 4th Embodiment of this invention.

(First embodiment)
A pipe joint 10 according to a first embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG.
As shown in FIG. 1, a pipe joint 10 according to the present embodiment is a member for connecting pipes for water supply, hot water supply, or air conditioning equipment in a building. In the illustrated example, the pipe joint 10 has a symmetrical shape on both sides with respect to the central portion. In the following description, the configuration of one side will be described.
The pipe joint 10 includes a tubular joint main body 11 having a housing recess 11D formed on the inner peripheral surface of an open end 11F.

In the following description, the direction along the central axis O of the joint body 11 is called the axial direction, the direction in which the opening edge of the joint body 11 faces is called the outside, and the opposite side is called the inside.
Further, the direction intersecting with the central axis O in plan view seen from the axial direction is called the radial direction, and the direction rotating around the central axis O in plan view is called the circumferential direction.

The accommodation recess 11D is recessed radially outward from the inner peripheral surface of the open end 11F.
An inner flange portion 11A that protrudes radially inward is formed on the axially inner side of the joint main body 11 . The inner flange portion 11A extends over the entire circumference of the inner peripheral surface of the joint body 11 .
An axially intermediate portion of the joint body 11 is formed with an outer flange portion 11B projecting radially outward. The outer flange portion 11B extends over the entire circumference of the outer peripheral surface of the joint body 11 . A male threaded portion 11C is formed in a portion of the outer peripheral surface of the joint body 11 located above the outer flange portion 11B.

A housing recess 11D formed in the inner peripheral surface of the open end portion 11F of the joint body 11 extends over the entire inner peripheral surface of the open end portion 11F. A seal member 20 is housed in the housing recess 11D. The seal member 20 is in contact with the outer peripheral surface of the pipe 60 inserted into the joint body 11 from the open end 11F. An O-ring is adopted as the sealing member 20 in the illustrated example.

Rubber materials such as ethylene/propylene/diene rubber, fluororubber, silicone rubber, nitrile rubber, styrene/phthaladiene rubber, and chloroprene rubber can be used as the material of the sealing member 20 .

The pipe joint 10 also includes a capped tubular bush 12 attached to the open end portion 11F of the joint body 11 from the radially outer side. The bushing 12 is formed with an opening 12E coaxial with the open end 11F of the joint body 11 . The opening 12E has a circular shape when viewed from above.
An engaging recess 12</b>C recessed radially outward is formed on the inner peripheral surface of the bush 12 on the inner side in the axial direction. 12 C of engagement recessed parts are extended over the perimeter.

A female screw portion 12B is formed on the inner peripheral surface of the engaging recess 12C. The bushing 12 is attached to the joint body 11 by attaching the female threaded portion 12B to the male threaded portion 11C of the joint body 11 . At this time, the open end portion 11F of the joint body 11 is engaged with the inner side of the engagement concave portion 12C of the bush 12 . Thereby, the bush 12 and the joint main body 11 can be firmly engaged.
A lower end portion of the bushing 12 abuts the outer flange portion 11B of the joint body 11 in the axial direction.

An inner peripheral latch 12</b>D is formed on the inner peripheral surface of the lower end of the bush 12 . The inner peripheral latch 12D engages with an outer peripheral latch 11E formed on the outer peripheral surface of the outer flange portion 11B of the joint body 11 in the circumferential direction. This prevents the bush 12 attached to the joint body 11 from loosening with respect to the joint body 11 .

The joint main body 11 and the bush 12 are formed, for example, by injection molding of a synthetic resin material. Materials for the joint body 11 and bushing 12 include crosslinked polyethylene, polybutene, vinyl chloride, polyphenylsulfone (PPSU), polyphenylene sulfide (PPS), glass fiber reinforced PPS, polyvinylidene fluoride, polycarbonate, polyacetal, etc., depending on the application. It can be arbitrarily selected based on quality design. Also, other processing methods such as cutting and fusion may be used.
Note that the joint main body 11 and the bushing 12 may be made of a metal material. In this case, it can be formed by casting, forging, cutting, or the like.

Inside the pipe joint 10 , an axially extending gap is provided between the open end portion 11</b>F of the joint body 11 and the top wall portion 12</b>A of the bushing 12 .
In this gap, a retainer ring 26 that prevents the pipe 60 from coming off and a fixing member 25 that fixes the retainer ring 26 to this gap are arranged in this order in the axial direction from the top wall portion 12A of the bush 12. It is That is, the fixing member 25 is arranged in the gap on the opposite side of the top wall portion that sandwiches the retainer ring 26 in the axial direction.

As shown in FIG. 2, a locking ring portion 26A is formed on the radially inner side of the retainer ring 26 so as to extend axially inward gradually toward the radially inner side. The inner peripheral edge of the locking ring portion 26A is located radially inside the inner peripheral surfaces of the joint body 11, the bush 12, and the fixing member 25, respectively.

The retainer ring 26 is formed, for example, by pressing a metal material such as stainless steel. A plurality of engaging teeth 26B protruding radially inward are formed at intervals in the circumferential direction on the inner peripheral edge of the locking ring portion 26A.
The engaging teeth 26B of the retaining ring 26 bite into the outer peripheral surface of the pipe 60 inserted into the opening 12E of the pipe joint 10, thereby preventing the pipe 60 from slipping out of the opening 12E of the pipe joint 10 in the axial direction. Deter.

As shown in FIG. 1, the fixing member 25 is made of synthetic resin material, for example. The fixing member 25 fixes the retainer ring 26 to the bush 12 . Of the outer surface of the fixing member 25, an inner end surface facing inward in the axial direction is formed with an engaging ring portion 25A projecting inward in the axial direction.
The engagement ring portion 25A is formed on the inner peripheral edge portion of the inner end surface of the fixing member 25 over the entire circumference. The engagement ring portion 25A is fitted inside the open end portion 11F of the joint body 11 . Thereby, the fixed member 25 and the joint main body 11 can be firmly engaged.

Of the outer surface of the fixing member 25, a bowl-shaped concave portion 25B that is recessed inward in the axial direction is formed in the outer end surface facing outward in the axial direction. The bowl-shaped concave portion 25B is formed along the entire circumference of the inner peripheral edge portion of the outer end surface of the fixing member 25 . The bowl-shaped recessed portion 25B is formed in a curved surface that protrudes inward in the axial direction when viewed in longitudinal section as shown in FIG.
A locking ring portion 26A of the retaining ring 26 is arranged inside the bowl-shaped concave portion 25B.

In this embodiment, the fixing member 25 fixes the seal member 20 inside the housing recess 11</b>D to the joint main body 11 . An axial gap is formed between the seal member 20 and the fixed member 25 .
That is, the fixing of the sealing member 20 by the fixing member 25 means that the sealing member 20 is prevented from being detached from the accommodation recess 11D toward the outside in the axial direction. It does not mean that they are always in contact with 20. The engagement ring portion 25A of the fixing member 25 may be in contact with the sealing member 20 from the outside in the axial direction.

An axial gap is formed between the seal member 20 and the inner end surface of the housing recess 11D facing outward in the axial direction. The seal member 20 may be in contact with the inner end surface of the housing recess 11D.
The seal member 20 is in contact with the inner peripheral surface of the accommodation recess 11D.

Further, the joint main body 11 has transparency to the extent that the pipe 60 inserted into the joint main body 11 from the open end portion 11F can be visually recognized from the outside. Being able to visually recognize the pipe 60 from the outside means that the position of the tip of the pipe 60 can be visually recognized from the outside. The total light transmittance (JIS K 7375:2008) of the joint body 11 is preferably 50 to 100%. In this case, the inner tubular body 50 (pipe 60) can be reliably visually recognized through the joint main body 11, as will be described later.
The joint main body 11 includes a mounting tubular portion 13 to which the bushing 12 is attached from the radially outer side, and a support tubular portion 14 that supports the mounting tubular portion 13 .

A mounting tubular portion 13 is a portion of the joint main body 11 located axially outward from the portion where the outer flange portion 11B is formed. In addition, a portion of the joint main body 11 located axially inward of the mounting tubular portion 13 serves as a support tubular portion 14 .
The mounting tubular portion 13 and the supporting tubular portion 14 are integrally formed. An inner flange portion 11A is formed on the inner peripheral surface of the base end portion of the support cylinder portion 14 . The outer diameter of the support tubular portion 14 is smaller than the outer diameter of the mounting tubular portion 13 . A housing recess 11</b>D is formed on the inner peripheral surface of the mounting tube portion 13 .

Moreover, the bush 12 does not have transparency to the extent that the pipe 60 inserted into the joint main body 11 from the open end 11F can be visually recognized from the outside.
Therefore, the pipe 60 inserted into the joint main body 11 from the open end 11F can be visually recognized from the outside in the mounting cylindrical portion 13 to which the bush 12 is attached from the radially outer side of the joint main body 11. Gone. The total light transmittance (JIS K 7375:2008) of the bush 12 is preferably 0-50%. The total light transmittance of the bushing 12 is lower than the total light transmittance of the joint body 11 .

The pipe joint 10 also includes an inner tubular body 50 that is inserted into an end portion of the pipe 60 and that suppresses radially inward deformation of the pipe 60 .
The inner tubular body 50 is made of, for example, a metal material or a resin material having higher rigidity than the material forming the pipe 60 .

The inner tubular body 50 includes an insertion tubular portion 51 extending along the pipe 60, and a tip flange portion 52 connected to an end portion of the insertion tubular portion 51 and protruding radially outward. The upper surface of the distal end flange portion 52 is formed in a curved surface that protrudes upward.
When the inner cylindrical body 50 is inserted into the end of the pipe 60 , the tip flange portion 52 is positioned outside the pipe 60 .
The colors of the insertion tube portion 51 and the tip flange portion 52 are different from each other. The distal end flange portion 52 exposed to the outside when inserted into the end portion of the pipe 60 may be given a highly visible color such as a fluorescent color.

The inner cylindrical body 50 is held by a joint cap (not shown) attached to the bush 12, for example.
At the construction site, the joint cap holding the inner cylindrical body 50 is removed, and the inner cylindrical body 50 is removed from the joint cap. Next, as shown in FIG. 1, the inner tubular body 50 is inserted into the end of the pipe 60 when the pipe 60 connected to the pipe joint 10 is inserted into the opening 12E. At this time, the tip flange portion 52 is arranged so as to be positioned at the opening edge by being caught by the opening edge of the pipe 60 .

As described above, according to the pipe joint 10 according to the present embodiment, the seal member 20 is accommodated in the accommodation recess 11D formed in the inner peripheral surface of the open end portion 11F of the joint body 11. contacts the outer surface of the pipe 60 inserted inside the joint body 11 .
For this reason, compared to a configuration in which a seal member 20 is provided inside the pipe 60 to stop water between the joint main body 11 and the pipe 60, the spatial volume in the pipe 60 is secured, and the pipe 60 and the joint main body 11 are separated. It is possible to reduce pressure loss due to connection with.

A fixing member 25 is arranged in an axial gap formed between the opening end portion 11F of the joint body 11 and the top wall portion of the bushing 12, and the fixing member 25 is accommodated in the accommodation recess portion 11D. The sealing member 20 is fixed.
For this reason, it is possible to form the housing recess 11D in a state of opening in the axial direction. It is possible to easily form the accommodation recess 11D in the .
As described above, it is possible to easily manufacture the pipe joint 10 with a simple configuration while securing the spatial volume in the pipe 60 and reducing the pressure loss due to the connection between the pipe 60 and the joint main body 11 .

Further, since the joint main body 11 has permeability, the pipe 60 inserted into the joint main body 11 from the open end portion 11F can be visually recognized from the outside. Thus, in the work of connecting the pipe 60 to the joint main body 11 , it is possible to reliably grasp that the pipe 60 has been inserted inside the joint main body 11 by the prescribed length.

In addition, since the bush 12 does not have permeability, the pipe 60 inserted into the joint body 11 cannot be visually recognized from the outside in the portion of the joint body 11 where the bush 12 is attached from the outside in the radial direction. can't
Therefore, the pipe 60 can be visually recognized from the outside only when the pipe 60 is inserted deeper than the bush 12 inside the joint body 11 in the insertion direction, and the pipe 60 is properly inserted. can be grasped with certainty.

Further, the bush 12 attached to the mounting tube portion 13 prevents the pipe 60 located inside the mounting tube portion 13 from being visually recognized.
Therefore, the pipe 60 can be visually recognized from the outside only after the pipe 60 is inserted inside the support tube portion 14 located on the far side in the insertion direction of the bush 12, and the pipe 60 can be properly inserted. It is possible to ascertain with certainty that

Here, as in the present embodiment, when the pipe joint 10 includes the inner cylindrical body 50, the color of the bushing 12 and the color of the inner cylindrical body 50 (the color of the tip flange portion 52) are different. Sometimes it is possible to know more reliably whether the pipe 60 is properly inserted.

In this case, the color of the bush 12 is preferably achromatic, for example. The RGB values of the color of the bushing 12 satisfy at least one of the following three relationships: (1) RG=±30, (2) GB=±30, and (3) BR=±30. and more preferably all three relationships. Specific examples of achromatic colors include black (eg, RGB values of R13, G1, B22) and white (eg, RGB values of R240, G240, B240).

Furthermore, in this case, the colors of the inner cylindrical body 50 (color of the tip flange portion 52) are red (eg, RGB values are R177, G34, B26), reddish purple (eg, RGB values are R199, G67, B117), and magenta. (for example, RGB values are R208, G65, B126) or yellow-green (for example, RGB values are R102, G180, B71). When the color of the inner cylindrical body 50 is red to magenta, the RGB values of the color of the bushing 12 are preferably R150-255, G0-100, and B0-255. When the color of the inner cylindrical body 50 is yellowish green, the RGB values of the color of the bushing 12 are preferably R0-150, G150-255, and B0-150.

Each color described above is shown below using CIELAB instead of RGB values.
Black: L* = 0 to 15, a* may be any numerical value but preferably 0, b* may also be any numerical value but preferably 0
White: L* = 85 to 100, a* may be any numerical value but preferably 0, b* may also be any numerical value but preferably 0
Red: L* = 20-80 (preferably 35-65), a* = 35-60, b* = -10-40
Red purple: L* = 20 to 80 (preferably 35 to 65), a* = 30 to 60, b* = -5 to 40
Yellowish green: L* = 20 to 80 (preferably 35 to 65), a* = -60 to -30, b* = -10 to 35
If there is a difference of 100 or more in the sum of the numerical values of the three elements of CIELAB for the color of the bushing 12 and the color of the inner cylindrical body 50, it is easy to visually recognize.

Further, since the housing recess 11D is formed on the inner peripheral surface of the mounting tube portion 13, the sealing member 20 housed in the housing recess 11D cannot be visually recognized from the outside. Therefore, misidentification of the seal member 20 as the pipe 60 inserted inside the joint main body 11 can be prevented.
Further, since the joint main body 11 is provided with the inner cylindrical body 50, by inserting the pipe 60 inside the joint main body 11 with the inner cylindrical body 50 inserted into the end portion of the pipe 60, the pipe 60 can be expanded in diameter. It is possible to suppress deformation inward in the direction.

In addition, the inner cylindrical body 50 includes an insertion tube portion 51 and a tip flange portion 52, and the insertion tube portion 51 and the tip flange portion 52 have different colors. Therefore, in the inner cylindrical body 50, the leading end flange portion 52 connected to the end portion of the insertion cylindrical portion 51 and the insertion cylindrical portion 51 extending along the pipe 60 can be distinguished from each other, thereby reducing the construction work. can be done efficiently.

(Second embodiment)
Next, a second embodiment of the invention will be described with reference to FIG. In addition, in the present embodiment, the same reference numerals are given to the same configurations as in the first embodiment, and the description thereof will be omitted, and only the points of difference will be described.

As shown in FIG. 3, in the pipe joint 10B according to the present embodiment, a slide member (buffer member) 27 is arranged between the retainer ring 26 and the top wall portion of the bush 12 in the axial direction. there is
The sliding member 27 has a ring shape. The sliding member 27 is preferably made of a material having a small surface friction coefficient, such as a metal material. A radial gap is provided between the inner peripheral edge of the sliding member 27 and the outer peripheral surface of the pipe 60 .

As described above, according to the pipe joint 10B according to the present embodiment, the slide member 27 is arranged between the retainer ring 26 and the top wall portion of the bush 12 in the axial direction.
Therefore, by reducing the frictional resistance between the sliding member 27 and the retaining member, the sliding member 27 can rotate in the circumferential direction with respect to the retaining member.
As a result, when the pipe 60 inserted into the joint body 11 is rotated in the circumferential direction, the retaining member can rotate together with the pipe 60, and the pipe 60 can be prevented from coming off the retaining member. .

(Third embodiment)
Next, a third embodiment of the invention will be described with reference to FIG. In addition, in the present embodiment, the same reference numerals are given to the same configurations as in the first embodiment, and the description thereof will be omitted, and only the points of difference will be described.

As shown in FIG. 5(a), in a pipe joint 10D according to this embodiment, a plurality of sealing members 20 are provided inside a housing recess 11D. In the illustrated example, two sealing members 20 are arranged side by side in the axial direction. A spacer member 30 is arranged between the plurality of sealing members 20 to contact the inner peripheral surface of the housing recess 11D. The spacer member 30 is made of, for example, a synthetic resin material.

As shown in FIG. 5B, the spacer member 30 has a tubular shape.
The spacer member 30 is housed so as to come into axial contact with a step formed on the inner peripheral surface of the housing recess 11D in a state in which one sealing member 20 is housed in the housing recess 11D. After that, the other seal member 20 is housed in the housing recess 11D.

As described above, according to the pipe joint 10</b>D according to the present embodiment, the spacer member 30 is arranged between the plurality of seal members 20 so as to contact the inner peripheral surface of the housing recess 11</b>D. Therefore, the plurality of sealing members 20 can be prevented from axially displacing, and the sealing members 20 can reliably stop water between the joint main body 11 and the pipe 60 for a long period of time.

(Fourth embodiment)
Next, a third embodiment of the invention will be described with reference to FIG. In addition, in the present embodiment, the same reference numerals are given to the same configurations as in the first embodiment, and the description thereof will be omitted, and only the points of difference will be described.

As shown in FIG. 6, in the pipe joint 10E according to the present embodiment, the bush 32 is attached to the open end portion 11F of the joint body 31 from the inside in the radial direction. A top wall portion 12A of the bush 32 protrudes radially outward.
The accommodation recess 11D of the joint main body 31 is formed in a multi-stage shape. A seal member 20, a fixing member 25, and a retainer ring 26 are arranged axially in the housing recess 11D.

As described above, according to the pipe joint 10E according to the present embodiment, the fitting state of the joint main body 31 and the bushing 32 is opposite to that of the pipe joint 10 according to the first embodiment. Therefore, it is possible to give flexibility to the selection of the shape of the joint main body 31 and the bush 32 .

The technical scope of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

For example, in each of the embodiments described above, the joint body 11 has a certain degree of permeability, but the present invention is not limited to such an aspect. The joint body 11 may not have a certain degree of permeability.
Moreover, although the bush 12 has shown the structure which does not have a fixed permeability in each said embodiment, it is not restricted to such an aspect. Bushing 12 may have a certain permeability.

In each of the above-described embodiments, the joint main body 11 has a configuration in which the mounting tubular portion 13 and the supporting tubular portion 14 are provided, but the present invention is not limited to such an aspect. For example, the joint main body 11 may include only the mounting cylinder portion 13 .

Further, in each of the above-described embodiments, the configuration in which the accommodation recess 11D is formed on the inner peripheral surface of the mounting tubular portion 13 of the joint main body 11 is shown, but the configuration is not limited to this. The accommodation recess 11</b>D may be formed across the inner peripheral surfaces of the mounting tube portion 13 and the support tube portion 14 .

Further, in each of the above-described embodiments, the joint main body 11 has the inner cylindrical body 50, but the present invention is not limited to this. The joint main body 11 does not have to include the inner cylindrical body 50 .
Further, in each of the above-described embodiments, the inner cylindrical body 50 includes the insertion tube portion 51 and the tip flange portion 52, and the insertion tube portion 51 and the tip flange portion 52 have different colors. , is not limited to such a mode. The inner cylindrical body 50 may not include the insertion tube portion 51 and the tip flange portion 52, and the insertion tube portion 51 and the tip flange portion 52 may be of the same color.

Moreover, in each of the above-described embodiments, the configuration employing an O-ring as the sealing member 20 is shown, but the configuration is not limited to such a configuration. As in a pipe joint 10C according to a modification shown in FIG. 4, the sealing member 20 may be a tubular packing extending in the axial direction. In such a case, it is preferable to set the axial size of the housing recess 11D in the joint body 11 according to the axial size of the seal member 20 .

In each of the above-described embodiments, the pipe joint 10 has a symmetrical shape on both sides in the axial direction with respect to the central portion in the axial direction, but the configuration is not limited to this. The pipe joint 10 does not have to be symmetrical on both sides in the axial direction.

In addition, it is possible to appropriately replace the constituent elements in the above-described embodiment with well-known constituent elements without departing from the spirit of the present invention, and the modifications described above may be combined as appropriate.

Reference Signs List 10, 10B, 10C pipe joint 11, 31 joint body 11D accommodation recess 11F opening end 12, 32 bushing 12A top wall 12E opening 13 mounting cylinder 14 support cylinder 20 seal member 25 fixing member 26 retaining ring 27 slip Member 50 Inner cylinder 51 Insertion cylinder 52 Tip flange 60 Pipe

Claims (9)

a cylindrical joint body having a housing recess formed on the inner peripheral surface of the open end;
a cylindrical bush attached to the open end and having an opening coaxial with the open end;
a sealing member that is housed in the housing recess and abuts against the outer peripheral surface of the pipe that is inserted into the joint body from the open end;
A retainer ring disposed between the open end portion and the top wall portion of the bush so as to extend in the axial direction along the center axis of the joint body to prevent the pipe from coming off. and,
a fixing member arranged in the gap on the opposite side of the top wall portion sandwiching the retaining ring in the axial direction and fixing the sealing member to the joint body;
An engaging ring portion protruding inward in the axial direction is formed on an inner end face facing inward in the axial direction of the outer surface of the fixing member,
The engagement ring is fitted inside the open end ,
A bowl-shaped recess recessed inward in the axial direction is formed on an outer end surface of the fixing member that faces outward in the axial direction,
The bowl-shaped recess is formed in a curved surface that protrudes inward in the axial direction in a vertical cross-sectional view,
A portion of the outer end surface of the fixing member that is continuous with the bowl-shaped recess from the outside in the radial direction sandwiches the retainer ring in the axial direction between itself and the top wall portion,
A pipe joint, wherein a locking ring portion is formed on the radially inner side of the retainer ring and extends gradually inwardly in the axial direction toward the inner side in the radial direction. 2. The pipe joint according to claim 1, wherein the locking ring portion is arranged inside the bowl-shaped recess. 3. The pipe joint according to claim 1 , wherein the joint main body has such a permeability that the pipe can be visually recognized from the outside. 4. A pipe joint according to claim 3 , wherein said bushing does not have transparency to the extent that said pipe can be visually recognized from the outside. The joint body includes a mounting tubular portion to which the bush is attached from the radially outer side;
5. The pipe joint according to claim 4 , further comprising a supporting tubular portion that supports the mounting tubular portion. 6. The pipe joint according to claim 5 , wherein the housing recess is formed on the inner peripheral surface of the mounting cylinder. The pipe joint according to any one of claims 1 to 6 , further comprising an inner tubular body that is inserted into an end portion of the pipe and that suppresses radially inward deformation of the pipe. The inner cylindrical body includes an insertion cylindrical portion extending along the pipe, and a tip flange portion connected to an end portion of the insertion cylindrical portion and protruding radially outward,
8. The pipe joint according to claim 7 , wherein the insertion cylinder portion and the tip flange portion have different colors. A sliding member is disposed between the retainer ring and the top wall of the bush in the axial direction,
When the pipe inserted into the joint body is rotated in the circumferential direction, the sliding member rotates in the circumferential direction with respect to the retainer ring, and the retainer ring rotates together with the pipe. The pipe joint according to any one of claims 1 to 8 .

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