Pipe fittings

Abstract

This technology provides a way to prevent fluid from entering the space between pipe fittings and pipes from the outside. [Solution] A resin pipe joint connecting a first pipe and a second pipe comprises: a joint flange portion provided at one end of the pipe joint, which is connected to a first flange portion provided at the end of the first pipe facing the pipe joint; a fastening member that penetrates the joint flange portion in the direction of connection between the pipe joint and the first pipe and fastens the pipe joint and the first pipe; and a protruding portion provided around the entire circumference of the joint flange portion, which protrudes toward the first pipe and contacts the first flange portion.

Description

Technical Field

[0001] This disclosure relates to a pipe joint.

Background Art

[0002] As a pipe joint, a technique is known in which a flange portion of a pipe and a flange portion of a joint are fastened by bolts and nuts (Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] There was a risk that fluid would penetrate from the outside between the pipe joint and the pipe.

Means for Solving the Problems

[0005] This disclosure was made to solve the above problems and can be realized in the following forms.

[0006] According to an aspect of this disclosure, a resin pipe joint for connecting a first pipe and a second pipe is provided. This pipe joint includes a joint flange portion provided at one end of the pipe joint and connected to a first flange portion provided at an end of the first pipe on the side facing the pipe joint, a fastening member that penetrates the joint flange portion in the connecting direction of the pipe joint and the first pipe and fastens the pipe joint and the first pipe, and a protruding portion provided over the entire circumference of the joint flange portion, protruding toward the first pipe and contacting the first flange portion. According to the pipe joint of this aspect, the protruding portion can suppress the intrusion of fluid from the outside between the pipe joint and the first pipe.

[0007] Furthermore, this disclosure can be implemented in various forms, for example, in the form of a piping structure or a method for manufacturing pipe joints. [Brief explanation of the drawing]

[0008] [Figure 1] This is a diagram illustrating the piping structure. [Figure 2] This is an explanatory diagram of the piping structure in the second embodiment. [Modes for carrying out the invention]

[0009] A. First Embodiment: Figure 1 is an explanatory diagram of a piping structure 100 in one embodiment of the present disclosure. The piping structure 100 comprises a first pipe 10, a second pipe 20, and a pipe fitting 30. In this embodiment, the piping structure 100 is connected to a fuel cell stack. The piping structure 100 is used, for example, through which anode gas supplied to or discharged from the fuel cell stack flows.

[0010] The first pipe 10 is a pipe having a first flange portion 11. The first flange portion 11 is a portion extending radially from the first pipe 10, provided at the end of the first pipe 10 facing the pipe joint 30. The end of the first pipe 10 opposite to the end where the first flange portion 11 is provided is connected to, for example, a valve.

[0011] The second pipe 20 is a pipe having a second flange portion 21. The second flange portion 21 is a portion extending radially from the second pipe 20, provided at the end of the second pipe 20 facing the pipe joint 30. The end of the second pipe 20 opposite to the end with the second flange portion 21 is connected to, for example, a fuel cell stack.

[0012] The pipe fitting 30 is a resin component that connects the first pipe 10 and the second pipe 20. For example, polyethylene can be used as the resin. The pipe fitting 30 has a first fitting flange portion 31, a second fitting flange portion 32, a fastening member 33, a protective member 34, a sealing member 35, and a protruding portion 36.

[0013] The first joint flange portion 31 is a radially extending portion of the first joint flange portion 31, provided at one end of the pipe joint 30 that faces the first pipe 10. The first joint flange portion 31 is connected to the first flange portion 11.

[0014] The second joint flange portion 32 is a radially extending portion of the second joint flange portion 32, provided at the other end of the pipe joint 30 that faces the second pipe 20. The second joint flange portion 32 is connected to the second flange portion 21.

[0015] The fastening member 33 penetrates the joint flange in the direction of connection between the pipe joint 30 and the first pipe 10, and is a member that fastens the pipe joint 30 and the first pipe 10. In this embodiment, the fastening member 33 has a bolt 33a, a nut 33b, and a washer 33c.

[0016] The protective member 34 is a cylindrical member in which a bolt 33a is arranged inside. The protective member 34 suppresses deformation of the pipe joint 30 when the first pipe 10 and the pipe joint 30 are fastened together with the fastening member 33. The protective member 34 is, for example, a metal collar. In this embodiment, the length of the protective member 34 in the direction of connection between the pipe joint 30 and the first pipe 10 is greater than the thickness of the first joint flange portion 31 in the direction of connection between the pipe joint 30 and the first pipe 10. Therefore, a gap 40 is created between the first flange portion 11 and the first joint flange portion 31 by the protective member 34.

[0017] The sealing member 35 is a member that seals the space between the first flange portion 11 and the first joint flange portion 31. In this embodiment, the sealing member 35 is a gasket provided in a groove formed around the entire circumference of the surface of the first joint flange portion 31 facing the first flange portion 11.

[0018] The protruding portion 36 is provided around the entire circumference of the first joint flange portion 31, protruding toward the first pipe 10 and making contact with the first flange portion 11. More specifically, the protruding portion 36 protrudes from the surface of the first joint flange portion 31 facing the first flange portion 11. The length of the protruding portion 36 that protrudes from the surface facing the first flange portion 11 in the direction of connection between the pipe joint 30 and the first pipe 10 is greater than or equal to the length of the protective member 34 that protrudes from the surface facing the first flange portion 11 in the direction of connection between the pipe joint 30 and the first pipe 10. Therefore, the protruding portion 36 can contact the first flange portion 11. Furthermore, the protruding portion 36 is provided on the outer circumference side of the first joint flange portion 31 than the sealing member 35.

[0019] As described above, the pipe joint 30 of this embodiment prevents fluid from entering the space between the pipe joint 30 and the first pipe 10 from the outside due to the protruding portion 36. More specifically, even if fluid enters through the gap 40, it is possible to prevent the fluid from entering beyond the protruding portion 36 in the radial direction of the pipe joint 30. Therefore, for example, even if saltwater enters the gap 40, it is possible to prevent it from crystallizing around the sealing member 35 and pushing up the sealing member 35.

[0020] Furthermore, since the protruding portion 36 is part of the pipe joint 30, it is possible to prevent fluid from entering the space between the pipe joint 30 and the first pipe 10 from the outside without increasing the number of parts to be handled when connecting to the first pipe 10.

[0021] B. Second Embodiment: FIG. 2 is an explanatory diagram of the piping structure 100B in the second embodiment. The piping structure 100B in the second embodiment is different from the first embodiment in that the protruding portion 36B of the pipe joint 30B is provided at the outer edge portion of the first joint flange portion 31, and other configurations are the same.

[0022] The protruding portion 36B is provided over the entire outer peripheral edge of the first joint flange portion 31, protrudes in the connecting direction with the first pipe 10, and is a portion that contacts the first flange portion 11. The inner surface of the protruding portion 36B in the radial direction of the pipe joint 30 contacts the outer periphery of the first flange portion 11.

[0023] According to the pipe joint 30B of the second embodiment described above, the same effects as those of the first embodiment can be achieved. That is, the protruding portion 36B can suppress the intrusion of fluid from the outside between the pipe joint 30 and the first pipe 10. Further, the intrusion of fluid into the gap 40 can be suppressed.

[0024] C. Other embodiments: (C1) In the above-described embodiment, the pipe joint 30 has the protective member 34 and the sealing member 35. However, the pipe joint 30 may not have the protective member 34 and / or the sealing member 35.

[0025] (C2) In the above-described embodiment, the pipe joint 30 may include a fastening member that penetrates the second joint flange portion 32 in the connecting direction between the pipe joint 30 and the second pipe 20 and fastens the pipe joint 30 and the second pipe 20. Further, the pipe joint 30 may include a protruding portion provided over the entire circumference of the second joint flange portion 32, protruding toward the second pipe 20, and contacting the second flange portion 21.

[0026] This disclosure is not limited to the embodiments described above, and can be implemented in various configurations without departing from its spirit. For example, the technical features in the embodiments corresponding to the technical features in each form described in the summary of the invention can be replaced or combined as appropriate in order to solve the problems described above or to achieve some or all of the effects described above. Furthermore, if a technical feature is not described as essential in this specification, it can be deleted as appropriate. [Explanation of symbols]

[0027] 10…First pipe, 11…First flange section, 20…Second pipe, 21…Second flange section, 30, 30B…Pipe joint, 31…First joint flange section, 32…Second joint flange section, 33…Fastening member, 33a…Bolt, 33b…Nut, 33c…Washer, 34…Protective member, 35…Sealing member, 36, 36B…Protruding part, 40…Gap, 100, 100B…Piping structure

Claims

[Claim 1] A resin pipe fitting that connects the first pipe and the second pipe, A joint flange portion provided at one end of the pipe joint, the joint flange portion being connected to a first flange portion provided at the end of the first pipe facing the pipe joint, A fastening member that penetrates the joint flange portion in the direction of connection between the pipe joint and the first pipe, and fastens the pipe joint and the first pipe, A pipe fitting comprising: a projection provided around the entire circumference of the fitting flange portion, projecting toward the first pipe and in contact with the first flange portion.

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