Pipe fitting and pipe fitting attachment structure
The pipe fitting design with inclined grooves and seal rings addresses the issue of reduced sealing pressure in tilted pipe joints by using retainers with offset locking portions to maintain contact, ensuring consistent sealing performance.
Patent Information
- Application Number
- PCT/JP2025/014688
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2024-07-31
- Filing Date
- 2025-04-14
- Publication Date
- 2025-10-30
Smart Images
Figure JP2025014688_30102025_PF_FP_ABST
Abstract
Description
Pipe joint and pipe joint mounting structure
[0001] The present invention relates to a pipe joint to be attached to an attachment pipe and to an attachment structure thereof.
[0002] Patent Document 1 discloses a joint including a joint body having a cylindrical tubular portion and a pair of rotatable locking members fitted over the tubular portion of the joint body. The joint body has engaging pieces formed on the tubular portion so as to be elastically deformable. The locking members are formed in a tubular shape, and their inner peripheral surfaces contact the outer peripheral surface of the tubular portion of the joint body. When a pair of attachments are inserted into both ends of the joint body and the engaging pieces of the joint body are fitted over the outer surfaces of the attachments, the locking members contact the outer surfaces of the engaging pieces to prevent elastic deformation.
[0003] Japanese Utility Model Application Laid-Open Publication No. 1-65490
[0004] When both ends of the pipe fitting are inserted into the first and second mounting pipes, respectively, it is desirable to prevent a decrease in sealing pressure to the first and second mounting pipes even if the pipe fitting is tilted relative to the first and second mounting pipes.
[0005] An object of the present invention is to provide a technique that can prevent a decrease in sealing pressure to the first attachment pipe and the second attachment pipe even if the pipe joint is tilted relative to the first attachment pipe and the second attachment pipe.
[0006] In order to solve the above-mentioned problems, one aspect of the present invention provides a pipe fitting for connecting a first attachment pipe and a second attachment pipe, the pipe fitting comprising: a tubular portion having a first connection portion located at one end, formed in a tubular shape, and connected in communication with the first attachment pipe, and a second connection portion located at the other end, formed in a tubular shape, and connected in communication with the second attachment pipe; a first seal ring provided in the first connection portion; and a second seal ring provided in the second connection portion. The first connection portion has a first groove for supporting the first seal ring. The second connection portion has a second groove for supporting the second seal ring. The first groove has a first bottom inclined with respect to the central axis of the tubular portion. The second groove has a second bottom inclined with respect to the central axis of the tubular portion.
[0007] Another aspect of the present invention is a pipe joint mounting structure. The pipe joint mounting structure includes a first mounting pipe, a second mounting pipe, and a pipe joint having one end fixed to the first mounting pipe and the other end fixed to the second mounting pipe. The pipe joint mounting structure includes a tubular portion having a first connecting portion located at one end, formed in a tubular shape, and connected to the first mounting pipe in communication with the first mounting pipe, and a second connecting portion located at the other end, formed in a tubular shape, and connected to the second mounting pipe in communication with the second mounting pipe, a first seal ring provided at the first connecting portion, and a second seal ring provided at the second connecting portion. The first connecting portion has a first groove that supports the first seal ring. The second connecting portion has a second groove that supports the second seal ring. The first groove has a first bottom that is inclined with respect to the central axis of the tubular portion. The second groove has a second bottom that is inclined with respect to the central axis of the tubular portion. The first connecting portion has a gap between it and the circumferential surface of the first attachment pipe, and the second connecting portion has a gap between it and the circumferential surface of the second attachment pipe.
[0008] According to the present invention, it is possible to provide a technique that can prevent a decrease in the sealing pressure to the first attachment pipe and the second attachment pipe even if the pipe joint is tilted relative to the first attachment pipe and the second attachment pipe.
[0009] 16(a) and 16(b) are perspective views of a pipe fitting of a first embodiment; an exploded view of a pipe fitting of a first embodiment; a perspective view of a pipe fitting mounting structure of a first embodiment; a cross-sectional view of the pipe fitting mounting structure of a first embodiment; a cross-sectional view of the pipe fitting mounting structure with the first mounting pipe and the second mounting pipe misaligned; a cross-sectional view of the pipe fitting mounting structure shown in FIG. 4 along line A-A; a perspective view of a pipe fitting of a modified example; an exploded view of a pipe fitting of a modified example; an exploded view of a pipe fitting mounting structure of a second embodiment; a partial cross-sectional view of a tubular portion; a cross-sectional view of the pipe fitting mounting structure of a second embodiment; a view for explaining a method of assembling the pipe fitting mounting structure of the second embodiment; a perspective view of a pipe fitting mounting structure of a third embodiment, showing a state in which the first mounting pipe and the second mounting pipe have been removed from the pipe fitting mounting structure; an exploded view of a pipe fitting of a third embodiment; a perspective view of a cover member; FIG. 16(a) is a cross-sectional view of a first half body, and FIG. 16(b) is a front view of the first half body. Fig. 10 is a partial cross-sectional view of the pipe joint mounting structure of the third embodiment Fig. 11 is a cross-sectional view of the pipe joint mounting structure in an inclined state.
[0010] Fig. 1 is a perspective view of a pipe fitting 10 according to a first embodiment. Fig. 2 is an exploded view of the pipe fitting 10 according to the first embodiment. The pipe fitting 10 is attached to a pair of mounting pipes at both ends, and communicates the pair of mounting pipes. The pipe fitting 10 is provided, for example, in a cooling path for cooling a power supply device provided in a vehicle.
[0011] The pipe fitting 10 includes a tubular portion 12, a first retainer 14, a second retainer 16, a first seal ring 18, and a second seal ring 20. The tubular portion 12 is a substantially cylindrical pipe extending along a central axis. The first retainer 14 is capable of engaging with the first attachment pipe to prevent the tubular portion 12 from slipping off from the first attachment pipe, and the second retainer 16 is capable of engaging with the second attachment pipe to prevent the tubular portion 12 from slipping off from the first attachment pipe. In other words, the first retainer 14 and the second retainer 16 attach the tubular portion 12 to the first attachment pipe and the second attachment pipe.
[0012] The tubular portion 12 has a first insertion portion 30 located at one end and inserted into the first attachment tube, a second insertion portion 32 located at the other end and inserted into the second attachment tube, and an intermediate portion 33 located between the first insertion portion 30 and the second insertion portion 32.
[0013] The first insertion portion 30 has a first groove 34, a first inclined surface 35a, and a first inclined surface 35b formed on the outer peripheral surface over the entire circumference. The first groove 34 supports the first seal ring 18 so that it does not come off. The second insertion portion 32 has a second groove 36, a second inclined surface 37a, and a second inclined surface 37b formed on the outer peripheral surface over the entire circumference. The second groove 36 supports the second seal ring 20 so that it does not come off.
[0014] The first seal ring 18 is disposed on the outer periphery of the first insert 30, and the second seal ring 20 is disposed on the outer periphery of the second insert 32. The first seal ring 18 and the second seal ring 20 are O-rings, but are not limited to this and may have other cross-sectional shapes.
[0015] The first inclined surfaces 35a and 35b are disposed on both axial sides of the first groove portion 34 and are formed to be continuous with the first groove portion 34. The second inclined surfaces 37a and 37b are disposed on both axial sides of the second groove portion 36 and are formed to be continuous with the second groove portion 36.
[0016] The intermediate portion 33 has a first retaining portion 38, a second retaining portion 40, a first protrusion 42, and a second protrusion 44. The first retaining portion 38 and the second retaining portion 40 are formed to protrude radially outward from the outer circumferential surface of the intermediate portion 33, extend in a wall-like manner around the circumference, and are spaced apart from each other in the axial direction.
[0017] The first retaining portions 38 are formed as a pair spaced apart in the circumferential direction, and the second retaining portions 40 are formed as a pair spaced apart in the circumferential direction. The first retaining portions 38 and the second retaining portions 40 are formed to be offset from each other in the circumferential direction.
[0018] The first protrusion 42 and the second protrusion 44 are formed to protrude from the outer peripheral surface of the intermediate portion 33. The first protrusion 42 is formed to be continuous with the first retaining portion 38 and is located closer to the center of the tubular portion 12 than the first retaining portion 38. The second protrusion 44 is formed to be continuous with the second retaining portion 40 and is located closer to the center of the tubular portion 12 than the second retaining portion 40. In other words, the first protrusion 42 and the second protrusion 44 are located between the first retaining portion 38 and the second retaining portion 40 in the axial direction.
[0019] The first retainer 14 has a first annular portion 46, a first elastic locking portion 48, and a first recess 50. The first annular portion 46 is formed in an annular shape and surrounds the intermediate portion 33. The first elastic locking portion 48 extends from the first annular portion 46 in the axial direction and can be locked to the outside of the first attachment tube. The first elastic locking portion 48 extends from the first annular portion 46 toward the first insertion portion 30.
[0020] The first elastic locking portion 48 has a claw portion 48a and a thin portion 48b. The claw portion 48a is located on the tip side of the first elastic locking portion 48 and protrudes radially inward from the inner surface of the first elastic locking portion 48. The thin portion 48b is located midway through the first elastic locking portion 48 and is formed thinner on the base end side than the claw portion 48a. The thin portion 48b is formed so as to recess the inner surface of the first elastic locking portion 48 and is located adjacent to the claw portion 48a, thereby increasing the amount of protrusion of the claw portion 48a.
[0021] The first recess 50 is recessed radially outward in the inner circumferential surface of the first annular portion 46. The first recess 50 is formed at the same position as the first elastic locking portion 48 in the circumferential direction.
[0022] The second retainer 16 has a second annular portion 52, a second elastic locking portion 54, and a second recess 56. The second retainer 16 has the same shape as the first retainer 14. The second annular portion 52 surrounds the intermediate portion 33. The second elastic locking portion 54 extends axially from the second annular portion 52 and can be locked to the outside of the second attachment tube.
[0023] The second elastic locking portion 54 has a claw portion 54a and a thin-walled portion 54b. The claw portion 54a is located on the tip side of the second elastic locking portion 54 and protrudes radially inward from the inner surface of the second elastic locking portion 54. The thin-walled portion 54b is formed thinner on the base end side than the claw portion 54a. The second recess 56 is formed in the inner circumferential surface of the second annular portion 52 and recessed radially outward. The second recess 56 is formed at the same position in the circumferential direction as the second elastic locking portion 54.
[0024] 1 , the first annular portion 46 and the second annular portion 52 are positioned between the first retaining portion 38 and the second retaining portion 40, and their abutment restricts axial movement. Because the abutment between the first annular portion 46 and the second annular portion 52 realizes restriction of axial movement of the first retainer 14 and the second retainer 16, it is not necessary to provide protrusions other than the first retaining portion 38 and the second retaining portion 40 to restrict axial movement. This allows the axial length of the pipe fitting 10 to be shortened.
[0025] 1, the first elastic locking portion 48 and the second elastic locking portion 54 are provided at positions offset by 90 degrees in the circumferential direction of the tubular portion 12. In other words, the first retainer 14 and the second retainer 16, which have the same shape, are arranged offset in the circumferential direction.
[0026] Fig. 3 is a perspective view of the pipe joint mounting structure 1 of the first embodiment. Fig. 4 is a cross-sectional view of the pipe joint mounting structure 1 of the first embodiment. The pipe joint mounting structure 1 includes a pipe joint 10, a first mounting pipe 22, and a second mounting pipe 24.
[0027] The first attachment tube 22 and the second attachment tube 24 are cylindrical and have the same shape. The first attachment tube 22 has a first hook portion 60, and the second attachment tube 24 has a second hook portion 62. The first hook portion 60 is formed on the outer peripheral surface of the first attachment tube 22, protruding radially outward, and is formed around the entire circumference.
[0028] The pair of first elastic locking portions 48 lock onto the first hook portions 60 with a first gap S1, and the pair of second elastic locking portions 54 lock onto the second hook portions 62 with the first gap S1. That is, the claw portions 48a of the first elastic locking portions 48 face the first hook portions 60 with the first gap S1 in the axial direction. When the first insertion portion 30 attempts to come out of the first attachment tube 22, the claw portions 48a lock onto the first hook portions 60. The second elastic locking portions 54 are similar to the first elastic locking portions 48. The inner surfaces of the tip ends of the first elastic locking portions 48 abut against the outer peripheral surface of the first attachment tube 22.
[0029] The first seal ring 18 abuts against the inner circumferential surface of the first attachment pipe 22, and the second seal ring 20 abuts against the inner circumferential surface of the second attachment pipe 24. The first annular portion 46 and the second annular portion 52 surround the intermediate portion 33.
[0030] 4, the bottom surface of the first groove 34 is tapered toward one end of the tubular portion 12 and is inclined relative to the axial direction. The bottom surface of the second groove 36 is tapered toward the other end of the tubular portion 12 and is inclined relative to the axial direction.
[0031] 4, the first inclined surfaces 35a and 35b are formed so that the outer circumferential surface of the tubular portion 12 decreases in diameter as it moves away from the first groove portion 34. The second inclined surfaces 37a and 37b are formed so that the outer circumferential surface of the tubular portion 12 decreases in diameter as it moves away from the second groove portion 36.
[0032] The base ends of the pair of first elastic locking portions 48 form a second gap S2 with the outer peripheral surface of the first attachment tube 22. The inner surface of the base end of the first elastic locking portion 48 faces the outer surface of the tip end of the first attachment tube 22, with the second gap S2 between them. Similarly, the base ends of the pair of second elastic locking portions 54 also form a second gap S2 with the outer peripheral surface of the second attachment tube 24. This makes it less likely that the first elastic locking portions 48 will interfere with the tubular portion 12, particularly the first protrusion 42, even if the tubular portion 12 is tilted, allowing the first retainer 14 to maintain a state in which the first attachment tube 22 is prevented from slipping out. The base ends of the first elastic locking portions 48 are portions of the first elastic locking portions 48 that are located on the first annular portion 46 side, and are located closer to the first annular portion 46 than the thin-walled portion 48b.
[0033] 5 is a cross-sectional view of the pipe joint mounting structure 1 when the first mounting pipe 22 and the second mounting pipe 24 are misaligned. The first center axis C1 of the first mounting pipe 22 and the second center axis C2 of the second mounting pipe 24 may be misaligned in the radial direction as shown in FIG.
[0034] At this time, because the first retainer 14 holds the first attachment tube 22 and the second retainer 16 holds the second attachment tube 24, the first retainer 14 and the second retainer 16 also shift radially from each other, just like the first attachment tube 22 and the second attachment tube 24. This is because the first retainer 14 and the second retainer 16 are independent and can move individually. The central axis of the first retainer 14 is the same as the first central axis C1 of the first attachment tube 22, and the central axis of the second retainer 16 is the same as the second central axis C2 of the second attachment tube 24.
[0035] Because the tubular portion 12 cannot bend like a bellows hose, the central axis C of the tubular portion 12 is inclined relative to the first central axis C1 and the second central axis C2. In other words, when the first retainer 14 and the second retainer 16 are displaced radially, the tubular portion 12 is able to incline relative to the central axes of the first retainer 14 and the second retainer 16.
[0036] Even if the tubular portion 12 is tilted, it remains inserted into the first attachment tube 22 and the second attachment tube 24, respectively, and the first seal ring 18 and the second seal ring 20 can remain in contact with the inner surfaces of the first attachment tube 22 and the second attachment tube 24, respectively.
[0037] The first inclined surfaces 35a and 35b are formed so that the diameter of the outer circumferential surface of the tubular portion 12 decreases with increasing distance from the first groove portion 34. The second inclined surfaces 37a and 37b are formed so that the diameter of the outer circumferential surface of the tubular portion 12 decreases with increasing distance from the second groove portion 36. As shown in Fig. 5 , the first inclined surface 35a contacts the lower side of the inner circumferential surface of the first attachment tube 22, and the first inclined surface 35b contacts the upper side of the inner circumferential surface of the first attachment tube 22. This makes it easier for the tubular portion 12 to tilt inside the first attachment tube 22 and the second attachment tube 24.
[0038] The inclination angles of the first inclined surfaces 35a and 35b are determined by experiments or the like, and are determined based on the expected radial deviation of the first attachment tube 22 and the second attachment tube 24.
[0039] The bottom surface of the first groove 34 is formed so that its diameter decreases toward one end of the tubular portion 12, and the bottom surface of the second groove 36 is formed so that its diameter decreases toward the other end of the tubular portion 12. This prevents excessive deformation of parts of the first seal ring 18 and the second seal ring 20 when the tubular portion 12 is tilted inside the first attachment tube 22 and the second attachment tube 24, and also prevents a decrease in pressure at which other parts of the first seal ring 18 and the second seal ring 20 come into contact with the first attachment tube 22 and the second attachment tube 24, thereby preventing a partial decrease in seal pressure.
[0040] The first elastic locking portion 48 and the second elastic locking portion 54 are positioned 90 degrees apart in the outer circumferential direction of the tubular portion 12, making it possible to prevent the radial offset of the first elastic locking portion 48 and the second elastic locking portion 54 from changing depending on the rotational position.
[0041] Figure 6 is a cross-sectional view taken along line A-A of the pipe joint mounting structure 1 shown in Figure 4. The first annular portion 46 has a third gap S3 with the outer peripheral surface of the intermediate portion 33. The second annular portion 52 also has a third gap S3 with the outer peripheral surface of the intermediate portion 33. The first annular portion 46 and the second annular portion 52 have inner diameters that are larger than the outer diameter of the intermediate portion 33.
[0042] The first protrusion 42 enters the first recess 50 with a fourth gap S4. The second protrusion 44 enters the second recess 56 with a fourth gap S4. This restricts circumferential rotation of the first retainer 14 and the second retainer 16 relative to the tubular portion 12. When the first attachment tube 22 and the second attachment tube 24 are coaxial, the first retainer 14 and the second retainer 16 can be in a state where they do not abut against the tubular portion 12.
[0043] The first gap S1 and the second gap S2 shown in Figure 4 and the third gap S3 and the fourth gap S4 shown in Figure 6 are set by the allowable value of the axial misalignment of the first attachment tube 22 and the second attachment tube 24, and are set by the allowable value of the angle of inclination of the tubular portion 12 with respect to the central axis of the first retainer 14 and the second retainer 16.
[0044] Figure 7 is a perspective view of a modified pipe fitting 100. Figure 8 is an exploded view of the modified pipe fitting 100. The modified pipe fitting 100 differs from the pipe fitting 10 shown in Figure 1 in that the rotational positions of the first elastic locking portion 148 of the first retainer 114 and the second elastic locking portion 154 of the second retainer 116 are aligned. The pipe fitting 100 includes a tubular portion 112, a first retainer 114, a second retainer 116, a first seal ring 18, and a second seal ring 20.
[0045] The tubular portion 112 has a first insertion portion 30 located at one end and inserted into the first attachment tube 22, a second insertion portion 32 located at the other end and inserted into the second attachment tube 24, and an intermediate portion 133 located between the first insertion portion 30 and the second insertion portion 32.
[0046] The intermediate portion 133 has a first retaining portion 138, a second retaining portion 140, and a protrusion 142. The first retaining portion 138 and the second retaining portion 140 are formed to protrude radially outward from the outer circumferential surface of the intermediate portion 133 and face each other in the axial direction. The protrusion 142 is formed to protrude from the outer circumferential surface of the intermediate portion 133.
[0047] The first retainer 114 has a first annular portion 146, a first resilient locking portion 148, and a first recess 150. The first annular portion 146 is formed in an annular shape and surrounds the intermediate portion 133. The first resilient locking portion 148 extends from the first annular portion 146 in the axial direction and can be locked to the outside of the first attachment tube 22. A step portion 146a of the first annular portion 146 catches on the side edge of the first retaining portion 138, restricting rotation of the first annular portion 146.
[0048] The first recess 150 is formed by being recessed radially outward on the inner circumferential surface of the first annular portion 146. The protrusion 142 fits into the first recess 150 with a gap therebetween.
[0049] The second retainer 116 has a second annular portion 152, a second elastic locking portion 154, and a second recess 156. A step portion 152a of the second annular portion 152 catches on the side edge of the second retaining portion 140. The second retainer 116 has the same shape as the first retainer 114, and therefore a description thereof will be omitted.
[0050] The first annular portion 146 and the second annular portion 152 are positioned between the first retaining portion 138 and the second retaining portion 140, and abut against each other to restrict axial movement.
[0051] The first annular portion 146 and the second annular portion 152 have a gap from the outer circumferential surface of the intermediate portion 133. The first elastic locking portion 148 and the second elastic locking portion 154 have a gap from the outer circumferential surface of the tubular portion 12. In addition, the base ends of the first elastic locking portion 148 and the second elastic locking portion 154 have a gap from the outer circumferential surfaces of the first attachment tube 22 and the second attachment tube 24 in the radial direction.
[0052] The first retainer 114 and the second retainer 116 are loosely fitted into the tubular portion 112, and have a gap between them. Therefore, when the first retainer 114 and the second retainer 116 are displaced in the radial direction, the tubular portion 112 is able to tilt with respect to the central axes of the first retainer 114 and the second retainer 116.
[0053] Figure 9 is an exploded view of a pipe joint mounting structure according to a second embodiment. The pipe joint mounting structure according to the second embodiment differs significantly from the pipe joint mounting structure 1 shown in Figure 3 in that it does not have the first retainer 14 and the second retainer 16. Because the first mounting pipe 22 and the second mounting pipe 24 in the second embodiment are fixed to the vehicle body, a power supply unit, or the like, the pipe joint mounting structure does not require the first retainer 14 and the second retainer 16.
[0054] The pipe joint mounting structure of the second embodiment includes a first mounting pipe 22, a second mounting pipe 24, and a pipe joint. The first mounting pipe 22 and the second mounting pipe 24 have the same shape and size. The pipe joint includes a tubular portion 212, a first seal ring 18, and a second seal ring 20.
[0055] The tubular portion 212 has a first insertion portion 230 located on one end 230a side and inserted into the first attachment tube 22, a second insertion portion 232 located on the other end 232a side and inserted into the second attachment tube 24, and an intermediate portion 233 located between the first insertion portion 230 and the second insertion portion 232. The intermediate portion 233 has stopper portions 238 and 240 that protrude radially outward. The first insertion portion 230 and the second insertion portion 232 have the same shapes as the first insertion portion 30 and the second insertion portion 32 of the first embodiment.
[0056] The first insertion portion 230 has a first groove 234, a first inclined surface 70, and a third inclined surface 74 formed on the outer circumferential surface over the entire circumference. The first inclined surface 70 and the third inclined surface 74 correspond to the first inclined surface 35a and the first inclined surface 35b of the first embodiment and have the same shapes as those of the first embodiment. The second insertion portion 232 has a second groove 236, a second inclined surface 72, and a fourth inclined surface 76 formed on the outer circumferential surface over the entire circumference. The second inclined surface 72 and the fourth inclined surface 76 correspond to the second inclined surface 37a and the second inclined surface 37b of the first embodiment and have the same shapes as those of the first embodiment.
[0057] Figure 10 is a partial cross-sectional view of the tubular portion 212. Figure 10 shows an enlarged cross-section of the first insertion portion 230 located on the one end 230a side. The first groove portion 234 has a first bottom portion 78, a first wall portion 80, and a third wall portion 84. The first wall portion 80 extends radially outward from the other end 232a side of the first bottom portion 78. The third wall portion 84 extends radially outward from the one end 230a side of the first bottom portion 78.
[0058] The first bottom portion 78 has a diameter that narrows toward the one end 230a. This prevents excessive deformation of parts of the first seal ring 18 and the second seal ring 20 when the tubular portion 212 is tilted inside the first attachment tube 22 and the second attachment tube 24, and also prevents a decrease in pressure at which other parts of the first seal ring 18 and the second seal ring 20 come into contact with the first attachment tube 22 and the second attachment tube 24, thereby preventing a partial decrease in seal pressure.
[0059] The first inclined surface 70 tapers in diameter from the top 80a of the first wall portion 80 toward the other end 232a. When the tubular portion 212 is inclined relative to the first attachment tube 22 and the second attachment tube 24, the outer circumferential surface of the tubular portion 212 is less likely to come into contact with the inner circumferential surface of the first attachment tube 22, compared to an embodiment in which the outer circumferential surface of the first insertion portion 230 is uniformly cylindrical, making it easier for the tubular portion 212 to incline within the first attachment tube 22.
[0060] The third inclined surface 74 tapers in diameter from the top 84a of the third wall portion 84 toward the one end 230a. The third inclined surface 74 functions as a guide when inserting the tubular portion 12 into the first attachment tube 22. The inclination angle of the third inclined surface 74 relative to the central axis C of the tubular portion 212 changes midway. The third inclined surface 74 includes a tip portion 74a and a wall portion 74b. The inclination angle θ2 of the wall portion 74b on the one end 230a side is formed to be larger than the inclination angle θ3 of the tip portion 74a on the third wall portion 84 side. When the tubular portion 12 is inclined within the first attachment tube 22, the wall portion 74b abuts the first attachment tube 22, creating an escape space at the tip portion 74a. The third wall portion 84 can be made sufficiently high to prevent the first seal ring 18 from coming off.
[0061] A diameter D1 of the top 84a of the third wall portion 84 is smaller than a diameter D2 of the top 80a of the first wall portion 80. Because the distance from the center of the tubular portion 212 of the third wall portion 84 is longer than that of the first wall portion 80, when the tubular portion 212 is tilted, the third wall portion 84 is displaced more than the first wall portion 80. By making the diameter D1 of the third wall portion 84 of the third wall portion 84 smaller than that of the first wall portion 80, it is possible to set both the top 80a of the first wall portion 80 and the third wall portion 84 of the third wall portion 84 to abut against the inner circumferential surface of the first attachment tube 22.
[0062] The inclination angle θ1 of the third inclined surface 74 with respect to the central axis C of the tubular portion 212 is formed to be larger than the inclination angle θ3 of the first inclined surface 70. This allows the top 84 a of the third wall portion 84 to abut the inner circumferential surface of the first attachment tube 22 before the top 80 a of the first wall portion 80 does, thereby enabling the first inclined surface 70 to come into surface contact with the inner circumferential surface of the first attachment tube 22.
[0063] 9 , the second insertion portion 232 has a symmetrical shape to the first insertion portion 230, and therefore has the same configuration and effect as the first insertion portion 230. The second insertion portion 232 has a second inclined surface 72, a fourth inclined surface 76, and a second groove portion 236.
[0064] The second wall portion 82 extends radially outward from one end 230a of the second bottom portion 88. The fourth wall portion 86 extends radially outward from the other end 232a of the second bottom portion 88. The diameter of the second bottom portion 88 decreases toward the other end.
[0065] The second inclined surface 76 tapers in diameter from the top of the second wall portion 82 toward the one end 230a. The fourth inclined surface 76 tapers in diameter from the top of the fourth wall portion 86 toward the other end 232a. The inclination angle of the fourth inclined surface 76 with respect to the central axis of the tubular portion 212 changes midway. The inclination angle of the fourth inclined surface 76 on the other end 232a side is formed to be larger than the inclination angle of the fourth inclined surface 76 on the fourth wall portion 86 side. The diameter of the top of the fourth wall portion 86 is smaller than the diameter of the top of the second wall portion 82. The inclination angle of the fourth inclined surface 76 with respect to the central axis of the tubular portion 212 is formed to be larger than the inclination angle of the second inclined surface.
[0066] 11 is a cross-sectional view of a pipe joint mounting structure 201 of the second embodiment. In Fig. 11, the central axes of the first mounting pipe 22 and the second mounting pipe 24 are misaligned, and the tubular portion 212 is inclined relative to the central axes of the first mounting pipe 22 and the second mounting pipe 24. The first seal ring 18 and the second seal ring 20 are in pressure contact with the first mounting pipe 22 and the second mounting pipe 24.
[0067] The diameter D2 of the top 80a of the first wall portion 80 and the diameter D1 of the top 84a of the third wall portion 84 are smaller than the diameter of the inner circumferential surface 22a. The first insertion portion 230 has a gap with the inner circumferential surface 22a of the first attachment tube 22. The first inclined surface 70 has a gap S5 with the inner circumferential surface 22a, and the third inclined surface 74 has a gap S6 with the inner circumferential surface 22a. Like the first insertion portion 230, the second insertion portion 232 has a gap with the inner circumferential surface 24a of the second attachment tube 24. Because the first insertion portion 230 and the second insertion portion 232 have gaps with the first attachment tube 22 and the second attachment tube 24, the tubular portion 212 is likely to tilt within the first attachment tube 22 and the second attachment tube 24. Even if the tubular portion 212 is tilted, the first seal ring 18 and the second seal ring 20 abut against the first attachment pipe 22 and the second attachment pipe 24, ensuring sealing performance.
[0068] 12A and 12B are diagrams illustrating a method for assembling a pipe joint mounting structure 201 according to a second embodiment. In Fig. 12A, the first insertion portion 230 of the pipe joint 210 is inserted into the first mounting pipe 22, and the second insertion portion 232 is about to be inserted into the second mounting pipe 24. When inserted only into the first mounting pipe 22, the tubular portion 212 is not inclined relative to the first mounting pipe 22.
[0069] The second attachment tube 24 is misaligned with the first attachment tube 22. The fourth inclined surface 76 of the first insertion portion 230 has a tip portion 76a and a wall portion 76b. Due to the misalignment, the tip portion 24b of the second attachment tube 24 abuts on the wall portion 76b. The wall portion 76b acts as an insertion guide and tilts the tubular portion 212.
[0070] As shown in Figure 12(b) , the first insertion portion 230 and the second insertion portion 232 have gaps with respect to the first attachment pipe 22 and the second attachment pipe 24, so that the tubular portion 212 is inclined with respect to the central axes of the first attachment pipe 22 and the second attachment pipe 24. The second attachment pipe 24 is further pushed in, resulting in the pipe joint attachment structure 201 shown in Figure 11 . The first attachment pipe 22 and the second attachment pipe 24 are hardened with resin or the like.
[0071] Fig. 13 is a perspective view of a pipe joint mounting structure 301 of the third embodiment, showing a state in which a first mounting pipe 322 and a second mounting pipe 324 have been removed from the pipe joint mounting structure 301. Fig. 14 is an exploded view of a pipe joint 310 of the third embodiment.
[0072] The pipe fitting 310 of the third embodiment is configured to accommodate axial misalignment of the first attachment pipe 322 and the second attachment pipe 324, but differs from the pipe fitting 10 shown in Figure 4 in that the first attachment pipe 322 and the second attachment pipe 324 are inserted inside.
[0073] The pipe fitting mounting structure 301 includes a pipe fitting 310, a first mounting pipe 322, and a second mounting pipe 324. The first mounting pipe 322 has a cylindrical portion 322a and a large-diameter portion 322b that is larger in diameter than the cylindrical portion 322a. The cylindrical portion 322a is inserted from one end 330a of the pipe fitting 310. The second mounting pipe 324 has a cylindrical portion 324a and a large-diameter portion 324b that is larger in diameter than the cylindrical portion 324a. The cylindrical portion 324a is inserted from the other end 332a of the pipe fitting 310.
[0074] The pipe fitting 310 communicates with the first attachment pipe 322 and the second attachment pipe 324. As shown in Figure 14, the pipe fitting 310 includes a cover member 338, a first half body 340a, a second half body 340b, a first seal ring 318, a second seal ring 320, and a third seal ring 321. The pair of cover members 338, the first half body 340a, and the second half body 340b form the tubular portion 312. The pair of cover members 338 have the same shape. The first half body 340a and the second half body 340b have different positions on one end 330a and the other end 330b, but have the same shape.
[0075] The first seal ring 318 is housed inside the first half body 340a. The second seal ring 320 is housed inside the second half body 340b. The third seal ring 321 is supported by being sandwiched between the first half body 340a and the second half body 340b.
[0076] 15 is a perspective view of the cover member 338. The pair of cover members 338 are joined together to form an annular shape. The cover member 338 has an annular recess 342, an inner circumferential surface 344, a locking portion 346, a locked portion 348, a third inclined surface 374, a fourth inclined surface 376, a third wall portion 384, and a fourth wall portion 386.
[0077] The pair of cover members 338 are formed into a tubular shape by being joined by a locking portion 346 and a locked portion 348, and cover the first half body 340a and the second half body 340b in a mated state. The locking portion 346 is formed into a hole-like shape and protrudes. The locked portion 348 is formed into a convex shape and locks with the locking portion 346 of another cover member 338. Note that the shapes of the locking portion 346 and the locked portion 348 are not limited to this embodiment and may be, for example, elastic claws that lock together.
[0078] The annular recess 342 is formed by recessing the central portion of the inner circumferential surface 344, and has a predetermined axial width. A plurality of protrusions 344a are formed circumferentially spaced apart on the inner circumferential surface 344. The protrusions 344a abut against the outer circumferential surfaces of the first half body 340a and the second half body 340b, suppressing radial rattle of the first half body 340a and the second half body 340b.
[0079] The third wall portion 384 is located on the one end 330a side, and is formed in a flat plate shape, protruding radially inward from the inner circumferential surface 344. The fourth wall portion 386 is located on the other end 332a, and is formed in an annular and flat plate shape, protruding radially inward from the inner circumferential surface 344. The third wall portion 384 and the fourth wall portion 386 are formed in an annular shape when the pair of cover members 338 are coupled together.
[0080] The third inclined surface 374 widens in diameter from the top 384a of the third wall portion 384 toward the one end 330a. The fourth inclined surface 376 widens in diameter from the top 386a of the fourth wall portion 386 toward the other end 332a.
[0081] 16(a) is a cross-sectional view of the first half 340a, and FIG. 16(b) is a front view of the first half 340a. The first half 340a has an annular protrusion 350, a first inclined surface 370, a first bottom 378, a first wall 380, a retaining groove 390, and a central inner circumferential surface 392.
[0082] The annular protrusion 350 protrudes radially outward from the center of the pipe fitting 310. The retaining groove 390 is formed circumferentially on the back surface of the first half body 340a. The retaining groove 390 sandwiches the third seal ring 321. The central inner peripheral surface 392 is formed cylindrically.
[0083] The first bottom portion 378 is inclined with respect to the central axis of the tubular portion 312 and expands in diameter toward one end 330a (the left side in FIG. 16(a)). The first wall portion 380 stands upright from the other end of the first bottom portion 378 (the right side in FIG. 16(a)).
[0084] 17 is a cross-sectional view of a pipe fitting 310 of the third embodiment. Note that the seal ring is actually deformed when in position, but is shown in its undeformed state. The first connecting portion 330 is located on one end 330a, is formed in a tubular shape, and is connected to and communicates with the first attachment pipe 322. The second connecting portion 332 is located on the other end 332a, is formed in a tubular shape, and is connected to and communicates with the second attachment pipe 324.
[0085] The first connecting portion 330 has a first groove 334 that supports the first seal ring 318. The second connecting portion 332 has a second groove 336 that supports the second seal ring 320. The first groove 334 has a first bottom 378, a first wall 380, and a third wall 384. The second groove 336 has a second bottom 388, a second wall 382, and a fourth wall 386.
[0086] The first bottom portion 378 and the second bottom portion 388 are inclined with respect to the central axis of the tubular portion 312. This prevents excessive deformation of parts of the first seal ring 318 and the second seal ring 320 when the central axis of the tubular portion 312 is inclined with respect to the central axes of the first attachment tube 322 and the second attachment tube 324, and also prevents an excessive decrease in the contact pressure of the first seal ring 318 and the second seal ring 320 due to the inclination of the first bottom portion 378 and the second bottom portion 388.
[0087] The first wall portion 380 stands upright from the other end of the first bottom portion 378. The third wall portion 384 stands upright from one end of the first bottom portion 378. The second wall portion 382 stands upright from one end of the second bottom portion 388. The fourth wall portion 386 stands upright from the other end of the second bottom portion 388. Note that one end is on the same side as one end 330a of the first connecting portion 330, and the other end is on the same side as the other end 332a of the second connecting portion 332.
[0088] The first wall portion 380 has a shorter radial length than the third wall portion 384. The radial length of the first wall portion 380 refers to the length from the other end of the first bottom portion 378 to the top 380a of the first wall portion 380. The radial length of the third wall portion 384 refers to the length from one end of the first bottom portion 378 to the top 384a of the third wall portion 384. The second wall portion 382 has a shorter radial length than the fourth wall portion 386. The radial length of the second wall portion 382 refers to the length from one end of the second bottom portion 388 to the top 382a of the second wall portion 382. The radial length of the fourth wall portion 386 refers to the length from the other end of the second bottom portion 388 to the top 386a of the fourth wall portion 386. This allows the first groove 334 and the second groove 336 to be formed so as to become deeper from the center toward the end of the tubular portion 312. Therefore, when the tubular portion 312 is tilted relative to the first attachment tube 322 and the second attachment tube 324, it is possible to prevent the first seal ring 318 and the second seal ring 320 from being tilted excessively and to prevent a partial decrease in seal pressure.
[0089] The first bottom portion 378 expands in diameter toward one end 330a of the first connecting portion 330. The second bottom portion 388 expands in diameter toward the other end 332a of the second connecting portion 332. When the first attachment tube 322 and the second attachment tube 324 are inserted into the pipe fitting 310, it is possible to prevent a partial decrease in seal pressure when the first seal ring 318 and the second seal ring 320 are tilted.
[0090] The first connecting portion 330 has a first inclined surface 370 extending from the top 380a of the first wall portion 380 toward the other end 332a. The second connecting portion 332 has a second inclined surface 372 extending from the top 382a of the second wall portion 382 toward the one end 330a. This makes it easier to incline the first attachment tube 322 and the second attachment tube 324 inside the tubular portion 312 while ensuring the height of the first wall portion 380 and the second wall portion 382.
[0091] The first connecting portion 330 has a third inclined surface 374 extending from the top 384a of the third wall portion 384 toward the one end 330a. The second connecting portion 332 has a fourth inclined surface 376 extending from the top 386a of the fourth wall portion 386 toward the other end 332a. This makes it easier to incline the first attachment tube 322 and the second attachment tube 324 inside the tubular portion 312 while ensuring the height of the third wall portion 384 and the fourth wall portion 386.
[0092] The first inclined surface 370 is inclined in the opposite direction to the first bottom 378 with respect to the central axis of the tubular portion 312. Specifically, the first bottom 378 increases in diameter toward the one end 330a, while the first inclined surface 370 decreases in diameter toward the one end 330a. The second inclined surface 372 is inclined in the opposite direction to the second bottom 388 with respect to the central axis of the tubular portion 312. Specifically, the second bottom 388 increases in diameter toward the other end 332a, while the second inclined surface 372 decreases in diameter toward the other end 332a.
[0093] The third inclined surface 374 is inclined in the opposite direction to the first inclined surface 370 with respect to the central axis of the tubular portion 312. Specifically, the third inclined surface 374 expands in diameter toward the one end 330a, and the first inclined surface 370 contracts in diameter toward the one end 330a. The fourth inclined surface 376 is inclined in the opposite direction to the second inclined surface 372 with respect to the central axis of the tubular portion 312. Specifically, the fourth inclined surface 376 expands in diameter toward the other end 332a, and the second inclined surface 372 contracts in diameter toward the other end 332a. This makes it easier for the tubular portion 312 to tilt with respect to the first attachment tube 322 and the second attachment tube 324.
[0094] The first bottom portion 378 has a diameter that expands toward the end 330a, and the second bottom portion 388 has a diameter that expands toward the cylindrical portion 322a, which makes it easier to remove the first half body 340a and the second half body 340b from the mold during molding. If the first bottom portion 378 had a diameter that contracted toward the end 330a, an undercut would occur during molding.
[0095] First half body 340a, which is the member that forms first wall portion 380, is separate from cover member 338, which is the member that forms third wall portion 384. Second half body 340b, which is the member that forms second wall portion 382, is separate from cover member 338, which is the member that forms fourth wall portion 386. This reduces restrictions on molding, allows first groove portion 334 and second groove portion 336 to be formed sufficiently deep, and prevents first seal ring 318 and second seal ring 320 from being excessively crushed when tilted.
[0096] The third seal ring 321 is sandwiched between the first half body 340a and the second half body 340b. The third seal ring 321 presses the first half body 340a against the cover member 338 forming the third wall portion 384, and the second half body 340b against the cover member 338 forming the fourth wall portion 386. This prevents rattling between the first half body 340a and the second half body 340b and the cover member 338. This prevents the first half body 340a and the second half body 340b from shifting axially relative to the cover member 338, which would cause changes in the axial lengths of the first groove portion 334 and the second groove portion 336. This prevents changes in the spatial volumes of the first groove portion 334 and the second groove portion 336.
[0097] Figure 18 is a partial cross-sectional view of a pipe joint mounting structure 301 according to a third embodiment. Figure 18 shows a state in which the first mounting pipe 322 and the first connecting portion 330 are not tilted. The cylindrical portion 322a of the first mounting pipe 322 is inserted into the first connecting portion 330. The first seal ring 318 is in contact with the outer peripheral surface of the first mounting pipe 322 to provide a seal.
[0098] The first connecting portion 330 has gaps S7 and S8 with the circumferential surface of the first attachment tube 322. Gap S7 indicates the distance between the third wall portion 384 and the cylindrical portion 322a. Gap S8 indicates the distance between the second wall portion 382 and the cylindrical portion 322a. In this way, the inner surface of the first connecting portion 330 will not come into contact with the outer circumferential surface of the first attachment tube 322 unless it is inclined relative to the first attachment tube 322.
[0099] The second attachment pipe 324 and the second connection part 332 are in the same state as the first connection part 330. That is, like the first connection part 330, the second connection part 332 has a gap between itself and the circumferential surface of the second attachment pipe 324.
[0100] 19 is a cross-sectional view of the pipe joint mounting structure 301 in an inclined state. In FIG. 19, the central axes of the first mounting pipe 322 and the second mounting pipe 324 are misaligned, so the pipe joint 310 is inclined with respect to the central axes of the first mounting pipe 322 and the second mounting pipe 324.
[0101] As a result, the first connecting portion 330 and the second connecting portion 332 have gaps relative to the first mounting pipe 322 and the second mounting pipe 324, respectively, making it easier for the pipe fitting 310 to tilt relative to the first mounting pipe 322 and the second mounting pipe 324.
[0102] Since the first bottom 378 of the first groove portion 334 and the second bottom 388 of the second groove portion 336 are inclined so that the diameter increases from the center toward the end, the sealing pressure of the first seal ring 318 and the second seal ring 320 can be maintained appropriately without becoming too high or too low.
[0103] The first inclined surface 370, the second inclined surface 372, the third inclined surface 374, and the fourth inclined surface 376 make it easier for the pipe fitting 310 to tilt.
[0104] Because the diameter of the first bottom 378 expands toward the one end 330a, the first seal ring 318 moves toward the portion of the first groove 334 where the radial gap is larger, and therefore the first seal ring 318 is positioned closer to the one end 330a. If the first attachment tube 322 has a draft taper for molding, the outer diameter of the first attachment tube 322 increases from the distal end toward the proximal end. By positioning the first seal ring 318 closer to the one end 330a, it is possible to seal the proximal end side of the first attachment tube 322 and prevent a decrease in seal pressure. The second bottom 388 has a symmetrical shape to the first bottom 378, and therefore has the same effect.
[0105] The pipe fitting 10 of the first embodiment includes a first insertion portion 30 and a second insertion portion 32, and the pipe fitting 210 of the second embodiment includes a first insertion portion 230 and a second insertion portion 232. The first insertion portions 30, 230 function as first connecting portions that connect to the first attachment pipe 22, and the second insertion portions 32, 232 function as second connecting portions that connect to the second attachment pipe 24. The pipe fittings 10, 210, and 310 have in common a structure that allows for tilt relative to the first attachment pipe and the second attachment pipe.
[0106] The present invention is not limited to the above-described embodiments, and various modifications such as design changes may be made to the embodiments based on the knowledge of those skilled in the art, and such modified embodiments may also be included within the scope of the present invention.
[0107] In the third embodiment, the tubular portion 312 is configured by a pair of cover members 338, a first half body 340a, and a second half body 340b. However, the present invention is not limited to this. For example, the first half body 340a and the second half body 340b may be integrally formed, or the pair of cover members 338, the first half body 340a, and the second half body 340b may be integrally formed.
[0108] For example, the pair of cover members 338 are not limited to being divided along the central axis of the tubular portion 312, but may be divided along the radial direction of the tubular portion 312, such as the first half body 340a and the second half body 340b.
[0109] The present invention relates to a pipe joint to be attached to an attachment pipe and to an attachment structure thereof.
[0110] REFERENCE SIGNS LIST 1 Pipe joint mounting structure, 10 Pipe joint, 12 Tubular portion, 14 First retainer, 16 Second retainer, 18 First seal ring, 20 Second seal ring, 22 First mounting pipe, 24 Second mounting pipe, 30 First insertion portion, 32 Second insertion portion, 33 Intermediate portion, 34 First groove portion, 35a, 35b First inclined surface, 36 Second groove portion, 37a, 37b Second inclined surface, 38 First retaining portion, 40 Second retaining portion, 42 First convex portion, 44 Second convex portion, 46 First annular portion, 48 First elastic locking portion, 48a Claw portion, 48b Thin portion, 50 First recess portion, 52 Second annular portion, 54 Second elastic locking portion, 54a Claw portion, 54b Thin-walled portion, 56 Second recess, 60 First hook portion, 62 Second hook portion, 70 First inclined surface, 72 Second inclined surface, 74 Third inclined surface, 76 Fourth inclined surface, 78 First bottom portion, 80 First wall portion, 82 Second wall portion, 84 Third wall portion, 86 Fourth wall portion, 88 Second bottom portion, 330 First connecting portion, 332 Second connecting portion, 340a First half body, 340b Second half body.
Claims
1. A pipe fitting for connecting a first attachment pipe and a second attachment pipe, comprising: a tubular part having a first connection part located at one end, formed in a tubular shape, and connected in communication with the first attachment pipe, and a second connection part located at the other end, formed in a tubular shape, and connected in communication with the second attachment pipe; a first seal ring provided at the first connection part; and a second seal ring provided at the second connection part, wherein the first connection part has a first groove part that supports the first seal ring, and the second connection part has a second groove part that supports the second seal ring, the first groove part has a first bottom part that is inclined with respect to the central axis of the tubular part, and the second groove part has a second bottom part that is inclined with respect to the central axis of the tubular part.
2. A pipe fitting as described in claim 1, wherein the first groove portion has a first wall portion standing upright from the other end of the first bottom portion, the second groove portion has a second wall portion standing upright from the one end of the second bottom portion, the first connecting portion has a first inclined surface extending from the top of the first wall portion toward the other end, and the second connecting portion has a second inclined surface extending from the top of the second wall portion toward the one end, the first inclined surface inclining in the opposite direction to the first bottom portion with respect to the central axis of the tubular portion, and the second inclined surface inclining in the opposite direction to the second bottom portion with respect to the central axis of the tubular portion.
3. A pipe fitting as described in claim 2, characterized in that the first groove portion has a third wall portion standing upright from the one end of the first bottom portion, the second groove portion has a fourth wall portion standing upright from the other end of the second bottom portion, the first connecting portion has a third inclined surface extending from the top of the third wall portion toward the one end, and the second connecting portion has a fourth inclined surface extending from the top of the fourth wall portion toward the other end, the third inclined surface inclining in a direction opposite to the first inclined surface with respect to the central axis of the tubular portion, and the fourth inclined surface inclining in a direction opposite to the second inclined surface with respect to the central axis of the tubular portion.
4. A pipe fitting as described in claim 1 or 2, characterized in that the first connecting portion is configured so that the first mounting pipe can be inserted therein, the second connecting portion is configured so that the second mounting pipe can be inserted therein, the first bottom portion expands in diameter toward the one end, and the second bottom portion expands in diameter toward the other end.
5. A pipe fitting as described in claim 3, characterized in that the member forming the first wall portion is separate from the member forming the third wall portion, and the member forming the second wall portion is separate from the member forming the fourth wall portion.
6. A pipe fitting as described in claim 5, comprising: a first half-body having the first bottom and the first wall; a second half-body having the second bottom and the second wall; and a third seal ring sandwiched between the first half-body and the second half-body, wherein the third seal ring presses the first half-body against a member forming the third wall, and presses the second half-body against a member forming the fourth wall.
7. A pipe fitting as described in any one of claims 1 to 3, characterized in that the first connecting portion is a first inserting portion that is inserted into the first mounting pipe, the second connecting portion is a second inserting portion that is inserted into the second mounting pipe, the first groove portion is formed on the outer peripheral surface of the first connecting portion, the second groove portion is formed on the outer peripheral surface of the second connecting portion, the first groove portion has a first bottom portion that tapers in diameter toward the one end, and the second groove portion has a second bottom portion that tapers in diameter toward the other end.
8. A pipe fitting as described in claim 7, characterized in that the first groove portion has a first wall portion standing upright from the other end of the first bottom portion, the second groove portion has a second wall portion standing upright from the one end of the second bottom portion, the first wall portion standing upright radially outward from the other end side of the first bottom portion, the second wall portion standing upright radially outward from the one end side of the second bottom portion, the first insertion portion has a first inclined surface that tapers in diameter from the top of the first wall portion towards the other end, and the second insertion portion has a second inclined surface that tapers in diameter from the top of the second wall portion towards the one end.
9. The first groove portion has a third wall portion standing upright from the one end of the first bottom portion, the second groove portion has a fourth wall portion standing upright from the other end of the second bottom portion, the third wall portion standing upright radially outward from the one end side of the first bottom portion, the first insertion portion has a third inclined surface that narrows in diameter from the top of the third wall portion towards the one end, the inclination angle of the third inclined surface with respect to the central axis of the tubular portion changes midway, and the inclination angle of the third inclined surface on the one end side is formed to be larger than the inclination angle of the third inclined surface on the third wall portion side, the fourth wall portion standing upright radially outward from the other end side of the second bottom portion, and the second insertion portion has a fourth inclined surface that narrows in diameter from the top of the fourth wall portion towards the other end, 9. A pipe fitting according to claim 8, characterized in that the inclination angle of the fourth inclined surface with respect to the central axis of the tubular portion changes midway, and the inclination angle of the fourth inclined surface on the other end side is formed so as to be larger than the inclination angle of the fourth inclined surface on the fourth wall portion side.
10. A pipe fitting as described in claim 9, characterized in that the diameter of the top of the third wall portion is smaller than the diameter of the top of the first wall portion, and the diameter of the top of the fourth wall portion is smaller than the diameter of the top of the second wall portion.
11. A pipe fitting as described in claim 9, characterized in that the inclination angle of the third inclined surface relative to the central axis of the tubular portion is formed to be larger than the inclination angle of the first inclined surface, and the inclination angle of the fourth inclined surface relative to the central axis of the tubular portion is formed to be larger than the inclination angle of the second inclined surface.
12. A pipe fitting as described in claim 7, comprising: a first retainer that can be engaged with the first attachment pipe to prevent the tubular portion from slipping off from the first attachment pipe; and a second retainer that can be engaged with the second attachment pipe to prevent the tubular portion from slipping off from the second attachment pipe, wherein the tubular portion has an intermediate portion located between the first insertion portion and the second insertion portion, the first retainer has a first annular portion that surrounds the intermediate portion, and a first elastic locking portion that extends from the first annular portion and can be engaged with the outside of the first attachment pipe, the second retainer has a second annular portion that surrounds the intermediate portion, and a second elastic locking portion that extends from the second annular portion and can be engaged with the outside of the second attachment pipe, and wherein the tubular portion is arranged to be tiltable with respect to the central axes of the first retainer and the second retainer when the first retainer and the second retainer are displaced radially from each other.
13. A pipe fitting as described in claim 12, characterized in that the first annular portion is recessed into its inner peripheral surface and has a first recess, the second annular portion is recessed into its inner peripheral surface and has a second recess, the intermediate portion has a first convex portion and a second convex portion that protrude from its outer peripheral surface and are spaced apart in the axial direction, the first convex portion fits into the first recess, and the second convex portion fits into the second recess.
14. A pipe fitting as described in claim 13, characterized in that the intermediate portion has a pair of retaining portions protruding from the outer circumferential surface, and the first annular portion and the second annular portion are located between the pair of retaining portions and abut against each other, thereby restricting axial movement.
15. A pipe joint as described in claim 12, characterized in that the first elastic locking portion and the second elastic locking portion are provided at positions offset by 90 degrees in the outer circumferential direction of the tubular portion.
16. A pipe fitting comprising: a first attachment pipe; a second attachment pipe; and a pipe fitting having one end fixed to the first attachment pipe and the other end fixed to the second attachment pipe; a tubular portion having a first connection portion located at one end, formed in a tubular shape, and connected in communication with the first attachment pipe, and a second connection portion located at the other end, formed in a tubular shape, and connected in communication with the second attachment pipe; a first seal ring provided at the first connection portion; and a second seal ring provided at the second connection portion, wherein the first connection portion has a first groove portion that supports the first seal ring, the second connection portion has a second groove portion that supports the second seal ring, the first groove portion has a first bottom portion that is inclined with respect to the central axis of the tubular portion, and the second groove portion has a second bottom portion that is inclined with respect to the central axis of the tubular portion, and the first connection portion has a gap with the circumferential surface of the first attachment pipe, A pipe joint mounting structure, characterized in that the second connecting portion has a gap between itself and a peripheral surface of the second mounting pipe.
Citation Information
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Pipe fittings
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Pipe joint
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Flexible alignment sealing coupling
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