JP5113558B2 - Branch joint and packing used for the branch joint - Google Patents

Description

The present invention relates to a branch joint that is mounted in a state of communicating with a branch port formed through a pipe wall of a fluid pipe made of a synthetic resin such as polyethylene resin or vinyl chloride resin, and a packing used for the branch joint .

  When an external force of bending deformation is applied to a synthetic resin fluid pipe due to an earthquake or uneven settlement, the branch port formed through the pipe wall of the fluid pipe stretches and deforms, and the peripheral edge of the branch port is radially inward. However, there is a problem that the sealing function of the packing is lowered and leakage of fluid in the pipe is caused.

  As a method for solving such a problem, conventionally, for example, as shown in Patent Document 1, an opening having the same shape as the branch port is provided at the peripheral portion of the outer periphery of the fluid tube, and the fluid tube A synthetic resin reinforcing ring having a heating element that is heated by energization is provided on the contact surface with the outer peripheral surface of the outer peripheral surface, and can be attached to the fluid pipe from the radially outer side. A metal joint body (saddle) in which a branch pipe portion communicating with a branch port penetratingly formed in the pipe wall of the mounting region is provided on the outer surface side, and fixing means for fixing the joint body to the fluid pipe. An annular mounting recess for mounting an annular packing that seals a space between the outer peripheral surface of the fluid pipe and the peripheral edge portion of the branch port on the inner surface of the joint body; The radial direction of the reinforcing ring on the inner peripheral side that is the center side of the branch port Branch joint is formed a fitting recess for fitting the rectangular side is proposed.

  As another method, as shown in Patent Document 2, a half-cylinder saddle that can be contacted from the radially outer side with respect to the peripheral edge portion of the outer peripheral surface of the fluid pipe, and a diameter from the saddle. A joint body is prepared by integrally molding a branch pipe portion projecting outward in the direction and a cylindrical body that can be fitted into a branch port projecting radially inward from the saddle with a synthetic resin. The body, saddle, and inner peripheral surface of the branch port of the fluid pipe are heated and melted simultaneously with a heating device, and a joint joint is proposed in which the cylindrical body and saddle of the joint body are fused to the outer peripheral surface of the fluid pipe and the inner peripheral surface of the branch port. Has been.

JP 09-280461 A JP-A-11-118084

  In the case of the former branch joint, the peripheral edge portion of the branch opening of the fluid pipe is reinforced by a synthetic resin reinforcing ring fused to the outer peripheral surface thereof, and a metal joint body is connected to the reinforcing ring. By fitting the fitting recess from the outer side in the pipe radial direction, deformation of the branch port due to the bending deformation of the fluid pipe can be suppressed, but on the construction site, the peripheral part of the branch port on the outer peripheral surface of the fluid pipe In addition, since it is necessary to fuse a synthetic resin reinforcing ring provided with a heating element heated by energization on the contact surface with this, strict construction management is required so as not to cause poor fusion, Moreover, since the number of construction steps increases, the work efficiency has deteriorated.

  In the case of the latter branch joint, the cylinder body of the joint body is fitted into the branch port of the fluid pipe, but the joint body and the fluid pipe are made of the same synthetic resin, so the branch port caused by the bending deformation of the fluid pipe This is not effective in suppressing the deformation of the film, and aims to improve the positioning function with respect to the fluid pipe and the fusion strength. Moreover, since the joint body is fused to the fluid pipe at the construction site in the same manner as the former, strict construction management is required so as not to cause poor fusion, and the number of construction processes increases, resulting in poor work efficiency. It was.

The present invention has been made in view of the above-mentioned actual situation, and its main problem is that the number of construction steps can be reduced and the work can be performed by rational improvement using a metal joint body provided with a branch pipe portion. It is in providing the branch joint which can suppress the deformation | transformation of the branch port resulting from the bending deformation of a fluid pipe | tube, and the packing used for the branch joint, aiming at the ease of property.

According to a first characteristic configuration of the present invention, a branch pipe portion that can be attached to a synthetic resin fluid pipe from the radially outer side and communicates with a branch port formed through a pipe wall in the mounting area is provided. A branch joint comprising a metal joint projecting on the outer surface side, and a fixing means for securing the joint to the fluid pipe,
The joint body is integrally formed with a metal reinforcing body that protrudes radially inward from the inner peripheral surface thereof and fits into a branch port of the fluid pipe ,
An annular recess into which the lip seal portion of the annular packing that seals between the outer peripheral portion of the fluid pipe and the opening peripheral portion of the branch port in the outer peripheral surface of the fluid pipe enters the annular region on the outer peripheral side of the inner peripheral surface of the joint body In addition, an annular flat portion that enters into a gap between the outer peripheral surface of the fluid pipe and the inner peripheral surface of the joint body is formed integrally on the outer peripheral side of the lip seal portion of the packing . In the point.

  According to the above characteristic configuration, in the state where the joint body applied from the radially outer side to the fluid pipe is fixed by the fixing means, the metal reinforcing body integrally formed on the inner peripheral surface of the joint body is provided. Since the fluid pipe is fitted in the branch port, the deformation of the branch port due to the bending deformation of the fluid pipe can be suppressed by the metal reinforcement.

Therefore, compared to the conventional method, there is no need for a heat fusion process at the construction site, and it is possible to make a rational modification by simply forming a metal reinforcement on the inner peripheral surface of the joint body. The deformation of the branch port due to the bending deformation of the fluid pipe can be suppressed while reducing the amount of the fluid and facilitating the workability.
In addition, the lip seal portion of the packing can be easily mounted in the annular recess formed in the inner peripheral surface of the joint body, and an annular flat portion integrally formed on the outer peripheral side of the lip seal portion is used. Thus, it is possible to pre-fasten the joint body with an adhesive, and to prevent mounting defects such as wrinkles at the lip seal portion.
In addition, since the annular flat portion enters the gap between the outer peripheral surface of the fluid pipe and the inner peripheral surface of the joint body in a close contact state, the adhesive component is eluted due to the adhesive being exposed to the fluid in the pipe. Can be suppressed.
Further, when the end face of the annular flat portion is visible from the outside through the gap between the outer peripheral surface of the fluid pipe and the inner peripheral surface of the joint body, the lip seal portion of the packing depends on the mounting state of the end face of the annular flat portion. It is possible to determine whether or not there is an inappropriate wearing state in which wrinkles or the like occur.
In addition, even when the end face of the annular flat portion enters the gap between the outer peripheral surface of the fluid pipe and the inner peripheral surface of the joint body, the annular flat portion extends from the outer periphery of the lip seal portion. Therefore, it is possible to easily visually check the joint body by slightly lifting it when the joint body is mounted, so that the time and effort for determining whether or not the packing is in an inappropriate state is reduced.

  The 2nd characteristic structure by this invention exists in the point by which the said reinforcement body is comprised by the cylinder shape or substantially cylinder shape along the internal peripheral surface of the said branch port.

  According to the above characteristic configuration, in a state in which the joint body applied from the radially outer side to the fluid pipe is fixed by the fixing means, the cylindrical or substantially cylindrical shape integrally formed on the inner peripheral surface of the joint body Since the metal reinforcement body is fitted along the inner peripheral surface of the branch opening of the fluid pipe, the deformation of the branch opening caused by the bending deformation of the fluid pipe is made of a metal cylindrical or substantially cylindrical reinforcement body. Can be effectively suppressed.

  A third characteristic configuration according to the present invention is that the reinforcing body is composed of a plurality of reinforcing protrusions distributed along the inner peripheral surface of the branch port.

  According to the above characteristic configuration, in the state where the joint body applied from the radially outer side to the fluid pipe is fixed by the fixing means, the plurality of metal reinforcements integrally formed on the inner peripheral surface of the joint body Since the protrusions are inserted in a state of being distributed along the inner peripheral surface of the branch opening of the fluid pipe, the deformation of the branch opening due to the bending deformation of the fluid pipe is suppressed by a plurality of metal reinforcing protrusions. The weight of the joint body can be reduced.

  A fourth characteristic configuration according to the present invention is that the fitting margin of the reinforcing body with respect to the branch port is configured to be the same as or substantially the same as the thickness of the fluid pipe.

  According to the above-mentioned characteristic configuration, the fitting due to the bending of the fluid pipe is formed by configuring the fitting margin of the reinforcing body fitted along the inner peripheral surface of the branch port to be the same or substantially the same as the thickness of the fluid pipe. The deformation of the mouth can be effectively suppressed, and at the same time, the tip of the reinforcing body is flush with or substantially flush with the inner circumferential surface of the fluid pipe. Inflow resistance can be reduced.

According to a fifth characteristic configuration of the present invention, a joint body including the branch pipe portion among a plurality of joint bodies in which the fixing means is fixedly connected by a fastener so as to be detachable along the outer peripheral surface of the fluid pipe. It is in the point comprised from the other coupling body except.

  According to the above characteristic configuration, the pipe wall at the branch port formation portion of the fluid pipe is tightened evenly in the circumferential direction as much as possible by the plurality of joint bodies fixedly coupled with the fasteners detachably along the outer peripheral surface of the fluid pipe. be able to.

According to a sixth feature of the present invention, there is provided an attachment member in which the fixing means is applied to the fluid pipe from the radially outer side with a width smaller than the length in the tube axis direction of the joint body, and the attachment It is in the point comprised from the fastener which draws a member and a coupling body mutually in the radial direction inner side, and is fixedly connected.

According to the above-described characteristic configuration, the manufacturing cost can be reduced and the weight can be reduced as compared with the case where a part of the plurality of joint bodies fixedly coupled with the fasteners is detachable along the outer peripheral surface of the fluid pipe. Can be planned.
A seventh characteristic configuration according to the present invention is a packing used for a branch joint including any of the above characteristic configurations,
It enters an annular recess formed in an annular region on the outer peripheral side of the reinforcing body on the inner peripheral surface of the joint body, and seals between the annular concave portion and the opening peripheral edge portion of the branch port on the outer peripheral surface of the fluid pipe. The lip seal portion and the annular flat portion that is formed on the outer peripheral side of the lip seal portion and enters the gap between the outer peripheral surface of the fluid pipe and the inner peripheral surface of the joint body in a close contact state are integrally formed. In the point.

[First Embodiment]
1-6 cross | intersect with respect to the pipe core X of the fluid pipe | tube 1 to the outer peripheral surface 1a of the fluid pipe | tubes 1, such as a water pipe manufactured from synthetic resins, such as a polyethylene resin and a vinyl chloride resin (the said embodiment) A branch joint A is shown in which a branch pipe portion 2 that protrudes outward along the direction of the branch axis Y that is orthogonal) is integrally formed.

  As shown in FIGS. 1 to 3, the branch joint A has a substantially semi-cylindrical shape that can be attached to the fluid pipe 1 from the radially outer side, and is formed so as to penetrate the pipe wall of the attachment region. A joint body 4 made of cast iron (an example of metal) in which the branch pipe portion 2 communicating with the port 3 is integrally projected on the outer surface side, and fixing means B for fastening and fixing the joint body 4 to the fluid pipe 1 The fixing means B is a fluid having a width smaller than the length of the joint body 4 in the tube axis X direction and a portion facing the both ends of the joint body 4 in the tube axis X direction. A substantially semi-cylindrical cast iron (an example of metal) attachment member 5 that is applied to the pipe 1 from the radially outer side, and the attachment member 5 and the joint body 4 are arranged radially inward of each other. It is composed of a plurality of bolts 6 </ b> A and nuts 6 </ b> B that are examples of the fastener 6 that is pulled and fixedly connected.

  A connecting flange portion 4A that protrudes radially outward is integrally formed at both ends of the joint body 4 in the pipe circumferential direction, and the attachment member 5 is attached to both ends of the connecting flange portion 4A in the tube axis X direction. On the other hand, a connecting hole 4B for detachably connecting with a bolt 6A and a nut 6B is formed so as to penetrate therethrough, and the distal end of the branch pipe portion 2 formed at the central portion in the tube axis X direction of the joint body 4 The part is integrally formed with a connecting flange part 2A for connecting to a fluid device such as a branch pipe or a gate valve.

  As shown in FIGS. 2, 3, and 5, a fluid pipe 1 is provided at an opening peripheral portion on the proximal end side of the branch pipe portion 2 in the central portion in the tube axis X direction of the inner peripheral surface 4 a of the joint body 4. Made of cast iron (made of metal) having a cylindrical shape with an outer diameter slightly smaller than the inner diameter of the branch port 3 and a tip 7a of which has an arcuate curved surface with a curvature matching the shape of the inner peripheral surface of the fluid pipe 1 In the state in which the reinforcing body 7 of one example) is integrally protruded radially inward in a state of being fitted into the branch port 3 of the fluid pipe 1 and the joint body 4 is fixed to the fluid pipe 1, The fitting allowance of the body 7 into the branch port 3 is configured to be the same or substantially the same as the thickness of the fluid pipe 1, and the entire distal end 7 a of the reinforcing body 7 is flush with or substantially the same as the inner peripheral surface of the fluid pipe 1. It is configured to be flush with each other.

As shown in FIGS. 2 and 3, when the joint body 4 applied to the fluid pipe 1 from the radially outer side is fixed by the fixing means B, the inner peripheral surface 4 a of the joint body 4. Since the cylindrical cast iron reinforcing body 7 integrally formed with the fluid pipe 1 is fitted along the inner peripheral surface of the branch port 3 of the fluid pipe 1, deformation of the branch port 3 due to the bending deformation of the fluid pipe 1 is prevented. While being able to suppress effectively, the position shift in the pipe axis X direction of the joint body 4 with respect to the said fluid pipe | tube 1 and the circumferential direction can also be prevented reliably.
Furthermore, since the tip of the reinforcing body 7 is flush with or substantially flush with the inner peripheral surface of the fluid pipe 1, the fluid inflow resistance on the pipe inner peripheral surface side of the branch port 3 can be reduced.

  As shown in FIGS. 2 to 6, the annular region on the outer peripheral side of the reinforcing body 7 on the inner peripheral surface 4 a of the joint body 4 includes an opening peripheral portion of the branch port 3 on the outer peripheral surface 1 a of the fluid pipe 1. Among the constituent parts of the annular packing 8 made of synthetic rubber (for example, styrene butadiene rubber, etc.) that seals between the plurality of annular lip protrusions 8a are concentric and radially outward. An annular recess 4C into which the lip seal portion 8A continuously formed with the protrusion amount increasing toward the positioned lip projection 8a is formed, and a fluid pipe is provided on the outer peripheral side of the lip seal portion 8A of the packing 8. An annular flat portion 8B having a rectangular outline shape that enters into the gap between the outer peripheral surface 1a of 1 and the inner peripheral surface 4a of the joint body 4 in a close contact state is integrally formed.

  Of the front and back side surfaces of the packing 8, the circumferential surface of the annular recess 4 </ b> C of the joint body 4 is located at a position corresponding to the boundary between the lip seal portion 8 </ b> A and the annular flat part 8 </ b> B on one side surface facing the inner circumferential surface 4 a of the joint body 4. An annular stepped portion 8C for positioning that is brought into contact with the wall surface 4b in a fitted state is formed, and the inside of the joint body 4 is connected via an adhesive applied to a part of the annular flat portion 8B. It is configured to be held on the peripheral surface 4a.

Not only can the lip seal portion 8A of the packing 8 be easily mounted in the annular recess 4C formed in the inner peripheral surface 4a of the joint body 4, but also the circumference of the annular step portion 8C of the packing 8 and the annular recess 4C. By fitting with the wall surface 4b, the lip seal portion 8A of the packing 8 can be securely mounted at a predetermined position.
In addition, it is possible to pre-fasten the joint body 4 with an adhesive by using the annular flat portion 8B integrally formed on the outer peripheral side of the lip seal portion 8A. In addition to being able to suppress defects, the annular flat portion 8B enters the gap between the outer peripheral surface 1a of the fluid pipe 1 and the inner peripheral surface 4a of the joint body 4 in close contact, so that the adhesive enters the pipe fluid. Elution of the adhesive component due to exposure can be suppressed.

  As shown in FIGS. 2 to 4, the long side 8 b that is one end face of the annular flat portion 8 </ b> B disposed along the tube axis X direction of the fluid pipe 1 is a tube axis of the joint body 4. The length extending between both end faces 4b in the X direction, that is, the length L1 which is the same as the length of the joint body 4 in the X direction of the tube axis, and is arranged along the circumferential direction of the fluid pipe 1 The short side 8d, which is the other end surface of the flat portion 8B, is larger than the outer diameter of the lip seal portion 8A, and between the base end portions P of the two connecting flange portions 4A on the inner peripheral surface 4a of the joint body 4. The length L2 is shorter than the circumferential length.

  And the short side 8d of the said annular flat part 8B is closely_contact | adhered to the pipe axis X direction both ends surface 4b of the joint body 4 through the clearance gap between the outer peripheral surface 1a of the fluid pipe | tube 1 and the inner peripheral surface 4a of the joint body 4. Since the short side 8d of the annular flat portion 8B is exposed to the outside, the mounting state of the short side 8d of the annular flat portion 8B can be easily visually confirmed. It is possible to indirectly determine from the outside whether or not the lip seal portion 8A is in an inappropriate state in which wrinkles or the like are generated.

  In addition, the long side 8b of the annular flat portion 8B is located at a portion slightly inward from the base end portion P of the connecting flange portion 4A of the joint body 4 and is located at a curved portion of the joint body 4. The annular flat portion 8B extends from the outer periphery of the lip seal portion 8A, although it cannot be visually confirmed through the gap between the outer peripheral surface 1a of the fluid pipe 1 and the inner peripheral surface 4a of the joint body 4. Therefore, it can be easily visually confirmed by slightly lifting the joint body 4 when the joint body 4 is mounted. Therefore, it is necessary to determine whether or not the lip seal portion 8A of the packing 8 is in an inappropriate state. Less.

  Furthermore, by using together illumination means that can irradiate through the gap between the outer peripheral surface 1a of the fluid pipe 1 and the inner peripheral surface 4a of the joint body 4, the short sides 8d and the long sides 8b of the annular flat portion 8B You can also check the installation status.

  A connecting portion 5A protruding radially outward is integrally formed at both ends of the mounting member 5 in the pipe circumferential direction. The connecting portion 5A is connected to the joint body 4 by bolts 6A and nuts 6B. A connection hole 5B for detachably fixed connection is formed through.

  In this embodiment, the packing 8 is formed between the annular recess 4C formed in the inner peripheral surface 4a of the joint body 4 and the outer peripheral surface 1a of the fluid pipe 1 by tightening the bolt 6A and nut 6B with a set torque. At the same time, the lip seal portion 8A is compressed to a sealed state, and at the same time, the gap between the inner peripheral surface 4a of the joint body 4 and the outer peripheral surface 1a of the fluid pipe 1 is maintained at a set size, and the annular flat portion of the packing 8 8B is brought into close contact between the inner peripheral surface 4a of the joint body 4 and the outer peripheral surface 1a of the fluid pipe 1.

[Second Embodiment]
In the first embodiment described above, the metal reinforcing body 7 fitted into the branch port 3 of the fluid pipe 1 is formed in a cylindrical shape on the opening peripheral edge of the proximal end side of the branch pipe part 2 on the inner peripheral surface 4a of the joint body 4. However, as shown in FIG. 7, the reinforcing body 7 may be composed of a plurality of reinforcing protrusions 7 </ b> A that are distributed along the inner peripheral surface of the branch port 3.
In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.

[Third Embodiment]
In the first embodiment described above, the inner diameter of the reinforcing body 7 formed integrally with the opening peripheral edge of the proximal end side of the branch pipe portion 2 on the inner peripheral surface 4 a of the joint body 4 is set to be larger than the inner diameter of the branch pipe portion 2. Also, the diameter of the reinforcing body 7 is made smaller than the thickness of the reinforcing body 7, but as shown in FIG. 8, the inner diameter of the branch pipe portion 2 and the inner diameter of the reinforcing body 7 may be the same.
In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.

[Fourth Embodiment]
In the first embodiment described above, the fixing means B for fastening and fixing the joint body 4 to the fluid pipe 1 has a width smaller than the length of the joint body 4 in the tube axis X direction and the pipe shaft of the joint body 4. A substantially semi-cylindrical cast iron (an example of a metal) attachment member 5 that is applied to the fluid pipe 1 from the radially outer side at a portion facing both ends of the core X direction, and the attachment member 5 and the joint It is composed of a plurality of bolts 6A and nuts 6B which are an example of a fastener 6 that pulls the body 4 inward in the radial direction and is fixedly connected. However, as shown in FIGS. Is applied to the fluid pipe 1 from the outer side in the radial direction at a portion having a width smaller than the length of the joint body 4 in the tube axis X direction and opposing both ends of the joint body 4 in the tube axis X direction. A mounting member 9 made of a strip-shaped metal plate bent into a substantially semicircular arc shape that can be attached; It is an example of a fastener 6 that pulls the joint member 9 and the joint body 4 toward each other radially inward and fixedly connects them, and may be composed of bolts 6C and nuts 6D fixed to both ends of the mounting member 9. .
In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.

[Fifth Embodiment]
As shown in FIG. 11, a plurality of fixing means B for fastening and fixing the joint body 4 to the fluid pipe 1 are fixedly connected by a fastener 6 along the outer peripheral surface of the fluid pipe 1 (this embodiment). Among the two joint bodies 4 and 10 made of cast iron (an example of metal), the joint body 10 other than the joint body 4 including the branch pipe portion 2 and the fastener 6 are examples. A plurality of bolts 6A and nuts 6B may be used.

A connecting flange portion 10A projecting radially outward is integrally formed at both ends in the pipe circumferential direction of the other joint body 10, and a bolt 6A and a nut 6B with respect to the joint body 4 are formed on the connecting flange portion 10A. A connection hole (not shown) for detachably fixed connection is formed through.
In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.

[Other Embodiments]
(1) In the first embodiment described above, a metal reinforcing body that fits into the branch port 3 of the fluid pipe 1 at the opening peripheral edge of the proximal end side of the branch pipe part 2 on the inner peripheral surface 4 a of the joint body 4. 7 is formed in a cylindrical shape, but may be configured in a substantially cylindrical shape in which one or two circumferential directions of the reinforcing body 7 are cut.

  (2) In the first embodiment described above, the fitting allowance of the reinforcing body 7 formed integrally with the opening peripheral edge of the proximal end side of the branch pipe portion 2 on the inner peripheral surface 4a of the joint body 4 to the branch port 3 is as follows. Is configured to be the same as or substantially the same as the thickness of the fluid pipe 1, but the fitting allowance of the reinforcing body 7 may be configured to be larger or smaller than the thickness of the fluid pipe 1.

  (3) In the first embodiment described above, the annular flat portion 8B of the packing 8 is configured to be fastened to the joint body 4 in advance with an adhesive, but the locking claw formed on the inner peripheral surface of the joint body 4 The annular flat portion 8B of the packing 8 may be temporarily fixed.

  (4) In the first embodiment, the gap between the inner peripheral surface 4a of the joint body 4 and the outer peripheral surface 1a of the fluid pipe 1 is set to a set dimension by tightening the bolt 6A and nut 6B with a set torque. Although configured to be maintained, a gap forming means such as a protrusion is provided between the facing surfaces of the inner peripheral surface 4a of the joint body 4 and the outer peripheral surface 1a of the fluid pipe 1 to maintain the clearance between the facing surfaces at a set size. You may implement.

Overall front view showing a first embodiment of a branch joint of the present invention Overall cross-sectional front view Overall cross-sectional side view Exploded view of joint body and packing Exploded sectional view of joint body and fluid pipe The VI-VI line expanded sectional view in FIG. The expanded sectional front view of the principal part which shows 2nd Embodiment of the branch joint of this invention. The expanded sectional front view of the principal part which shows 3rd Embodiment of the branch joint of this invention. Whole cross-sectional side view which shows 4th Embodiment of the branch joint of this invention Overall front view showing the fourth embodiment Whole front view showing a fifth embodiment of the branch joint of the present invention

Explanation of symbols

A Branch joint B Fixing means X Tube shaft core 1 Fluid pipe 1a Outer peripheral surface 2 Branch pipe portion 3 Branch port 4 Joint body 4C Annular recess 4a Inner peripheral surface 5 Mounting member 6 Fastener 7 Reinforcing body 7A Reinforcing protrusion 8 Packing 8A Lip seal Part 8B Annular flat part 9 Mounting member 10 Joint body

Claims (7)

A metal pipe that can be attached to a synthetic resin fluid pipe from the outside in the radial direction and has a branch pipe portion that projects from a branch port penetratingly formed in the pipe wall of the mounting area. A branch joint comprising: a joint body; and a fixing means for fixing the joint body to the fluid pipe,
The joint body is integrally formed with a metal reinforcing body that protrudes radially inward from the inner peripheral surface thereof and fits into a branch port of the fluid pipe ,
An annular recess into which the lip seal portion of the annular packing that seals between the outer peripheral portion of the fluid pipe and the opening peripheral portion of the branch port in the outer peripheral surface of the fluid pipe enters the annular region on the outer peripheral side of the inner peripheral surface of the joint body In addition, an annular flat portion that enters into a gap between the outer peripheral surface of the fluid pipe and the inner peripheral surface of the joint body is formed integrally on the outer peripheral side of the lip seal portion of the packing . Branch joint.   The branch joint according to claim 1, wherein the reinforcing body is configured in a cylindrical shape or a substantially cylindrical shape along an inner peripheral surface of the branch port.   The branch joint according to claim 1, wherein the reinforcing body is composed of a plurality of reinforcing protrusions that are distributed and arranged along the inner peripheral surface of the branch port.   The branch joint according to any one of claims 1 to 3, wherein a fitting margin of the reinforcing body with respect to the branch port is configured to be the same as or substantially the same as a thickness of the fluid pipe. The fixing means is composed of other joint bodies excluding the joint body provided with the branch pipe portion among a plurality of joint bodies fixedly coupled with a fastener detachably along the outer peripheral surface of the fluid pipe. The branch joint according to any one of claims 1 to 4 . The fixing means has a width smaller than the length of the joint body in the tube axis direction and is attached to the fluid pipe from the radially outer side, and the mounting member and the joint body are radially inward of each other. The branch joint according to any one of claims 1 to 4 , wherein the branch joint is configured by a fastener that is pulled and fixedly connected to the side. A packing used for the branch joint according to any one of claims 1 to 6,
It enters an annular recess formed in an annular region on the outer peripheral side of the reinforcing body on the inner peripheral surface of the joint body, and seals between the annular concave portion and the opening peripheral edge portion of the branch port on the outer peripheral surface of the fluid pipe. The lip seal portion and the annular flat portion that is formed on the outer peripheral side of the lip seal portion and enters the gap between the outer peripheral surface of the fluid pipe and the inner peripheral surface of the joint body in a close contact state are integrally formed. Packing used for branch joints.

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