Flow path joint structure

Abstract

A seal member (30) is provided with: a cylindrical main body part (31) in which a communication hole (33) that communicates a pair of flow path holes (10a, 20a) is formed; and annular piercing parts (32, 32) that protrude toward the axial-direction outer side, which is a direction going away from the main body part, and are press-fitted into annular groove parts (12, 22) formed in a connecting end of a flow path hole of one fluid device. Prior to the press fitting, the radial-direction thickness of the piercing parts gradually increases toward the axial-direction outer side, and the radial-direction size of the groove parts gradually decreases toward the axial-direction inner side opposite to the axial-direction outer side. Due to the radial-direction thickness of the piercing parts being larger than the radial-direction size of the groove parts, in the state after press fitting, the piercing parts are prevented from dislodging from the groove parts so as to be prevented from moving toward the axial-direction inner side.

Description

Flow path joint structure

[0001] The present invention relates to a flow path joint structure including a pair of fluid devices and a sealing member that connects the flow path holes formed in the pair of fluid devices in a sealed state.

[0002] Conventionally, for example, as in Patent Document 1, a sealing member that seals and connects the flow path holes formed in two fluid devices is known. This sealing member has a cylindrical main body portion having a communication hole that communicates the flow path holes with each other, and a circular ring that protrudes axially outward from the inner diameter side of the axially outer end portion of the main body portion and is press-fitted into an annular seal groove formed at the connection end portion of the flow path hole of one of the fluid devices. In a pre-press-fitting state, which is a state before the seal portion is press-fitted into the seal groove, at least a part of the inner peripheral surface of the main body portion and the other parts of the inner peripheral surface of the seal portion excluding the axially outer end portion are formed so as to gradually decrease in diameter from the axially outer side toward the axially inner side.

[0003] And in a state where the sealing member is inserted between the two fluid devices, it is connected by a connecting member shown in, for example, Patent Document 2.

[0004] Japanese Patent No. 7364519, Japanese Patent No. 7281362

[0005] However, in the conventional flow path joint structure, when the tightening of the connecting member is loosened, for example, the seal portion is likely to come out of the seal groove due to the pressure in the pipe, and as a result, the interference margin between the seal portion and the seal groove decreases and the sealing performance deteriorates.

[0006] The present invention has been made in view of such points, and an object thereof is to maintain the sealing performance even when the tightening by the connecting member is loosened.

[0007] In order to achieve the above object, in this invention, the interference margin between the insertion portion and the groove portion is devised.

[0008] Specifically, the first invention relates to a flow path joint structure comprising a pair of fluid devices, a sealing member that connects the pair of fluid devices while sealing the flow path holes formed in each of them, and a connecting member that tightens and connects the pair of fluid devices while the sealing member is attached to the pair of fluid devices.

[0009] The sealing member comprises a cylindrical main body having a communication hole connecting a pair of flow path holes, and an annular insertion portion that protrudes axially outward in the direction away from the main body and is press-fitted into an annular groove formed at the connecting end of one of the flow path holes of the fluid device. In the pre-press-fit state, before the insertion portion is press-fitted into the groove, the radial thickness of the insertion portion gradually increases toward the axial outward direction, and / or the radial size of the groove gradually decreases toward the axial inward direction opposite to the axial outward direction. The radial thickness of the insertion portion is greater than the radial size of the groove, so in the post-press-fit state, after the insertion portion is press-fitted into the groove, the insertion portion is prevented from advancing axially inward relative to the groove.

[0010] According to the above configuration, the insertion portion is prevented from advancing axially inward relative to the groove, thus effectively suppressing the loosening of the connecting member and the insertion portion coming out of the groove, and preventing leakage of fluid flowing within the pair of fluid devices.

[0011] In the second invention, in the first invention, in the state after press-fitting, the interference margin between the insertion portion and the wall surface of the groove portion is greater on the axially inward side than on the axially outward side.

[0012] According to the above configuration, the direction in which the insertion part tries to come out is different from that of a normal configuration, as it is in a direction where the interference margin is larger, thus making it difficult for the insertion part to come out of the groove.

[0013] In the third invention, in the first invention, in the pre-press-fit state, in the cut surface cut by a plane parallel to the axial direction, the angle at which the groove portion becomes larger toward the axial side is greater than the angle at which the thickness of the insertion portion becomes thicker toward the axial side toward the axial side toward the axial side toward the axial side.

[0014] According to the above configuration, the interference margin at the base of the insertion part becomes larger, making it difficult for the insertion part to come out of the groove.

[0015] In the fourth invention, in the first invention, the insertion portions are arranged on both sides of the main body in an axial direction away from each other, and the groove portion is arranged radially outward of the pair of flow holes in accordance with the pair of insertion portions.

[0016] According to the above configuration, since neither of the pair of insertion parts is likely to come out of the groove, the possibility of the insertion parts coming out of the groove is further suppressed, and the fluid flowing through the pair of fluid devices is less likely to leak.

[0017] The fifth invention relates to a flow joint structure comprising a pair of fluid devices, a sealing member that connects the pair of fluid devices while sealing the flow path holes formed in each of them, and a connecting member that tightens and connects the pair of fluid devices while the sealing member is attached to the pair of fluid devices.

[0018] The sealing member has a cylindrical body portion in which a communication hole connecting a pair of flow path holes is formed, and a groove portion recessed in the axial direction toward the axial center of the body portion. An annular insertion portion is formed at the connecting end of one of the flow path holes of the fluid device, which is pressed into the groove portion. In the pre-press-fit state, before the insertion portion is pressed into the groove portion, the radial thickness of the insertion portion gradually increases toward the axial direction

[0019] According to the above configuration, the insertion portion on the fluid device side is prevented from advancing axially outward relative to the groove on the sealing member side, thus effectively suppressing the loosening of the connecting member and the insertion portion coming out of the groove, making it difficult for the fluid flowing inside the pair of fluid devices to leak.

[0020] In the sixth invention, in the fifth invention, the interference margin between the insertion portion and the wall surface of the groove portion in the press-fitted state is greater on the axially outward side than on the axially inward side.

[0021] According to the above configuration, when the inserted part tries to come out of the groove, the interference margin increases, which has the effect of making it difficult for it to come out.

[0022] In the seventh invention, in the fifth invention, in the pre-press-fit state, in the cut surface obtained by cutting with a plane parallel to the axial direction, the angle at which the groove portion becomes larger toward the axial direction is greater than the angle at which the thickness of the insertion portion becomes thicker toward the axial direction toward the inward direction.

[0023] According to the above configuration, the interference margin at the base of the insertion part becomes larger, making it difficult for the insertion part to come out of the groove.

[0024] In the eighth invention, in the fifth invention, the insertion portions are arranged radially outward from the pair of flow holes and extend toward each other, and the grooves are arranged to open toward the opposite side of the sealing member in the axial direction, in accordance with the pair of insertion portions.

[0025] According to the above configuration, since neither of the pair of insertion parts is likely to come out of the groove, the possibility of the insertion parts coming out of the groove is further suppressed, and the fluid flowing through the pair of fluid devices is less likely to leak.

[0026] In the ninth invention, in any one of the first to eighth inventions, the interference margin between the insertion portion and the wall surface of the groove portion in the post-press-fit state is greater than 0 on at least one of the radially inner and radially outer sides of the insertion portion.

[0027] According to the above configuration, the interference margin may be provided only on the radially inward side, only on the radially outward side, or on both sides.

[0028] As described above, according to the present invention, in the post-press-fit state where the insertion portion is pressed into the groove, the insertion portion is prevented from moving out of the groove, thereby maintaining sealing performance even when the tightening by the connecting member is loosened.

[0029] This is an enlarged cross-sectional view showing a part of the flow joint structure according to Embodiment 1 of the present invention. This is an enlarged cross-sectional view showing how the insertion part is inserted into the groove. This is a cross-sectional view showing the flow joint structure according to Embodiment 1 of the present invention. This is an enlarged cross-sectional view showing a part of the flow joint structure according to Modification 1 of Embodiment 1 of the present invention. This is an enlarged cross-sectional view showing how the insertion part is inserted into the groove according to Modification 1. This is an enlarged cross-sectional view showing a part of the flow joint structure according to Modification 2 of Embodiment 1 of the present invention. This is an enlarged cross-sectional view showing how the insertion part is inserted into the groove according to Modification 2. This is an enlarged cross-sectional view showing a part of the flow joint structure according to Modification 3 of Embodiment 1 of the present invention. This is an enlarged cross-sectional view showing a part of the flow joint structure according to Modification 4 of Embodiment 1 of the present invention. This is an enlarged cross-sectional view showing a part of the flow joint structure according to Embodiment 2 of the present invention. This is an enlarged cross-sectional view showing a part of the flow joint structure according to Embodiment 3 of the present invention.

[0030] Embodiments of the present invention will be described below with reference to the drawings.

[0031] (Embodiment 1) Figures 1A to 1C show a flow path joint structure 1 of Embodiment 1 of the present invention, which comprises a pair of fluid devices 10 and 20. The pair of fluid devices 10 and 20 are, for example, flanged piping, integrated panels, valves, pumps, accumulators, pressure gauges, etc. Each of the pair of fluid devices 10 and 20 has a flow path hole 10a and 20a with a circular cross-section, through which fluid flows. The axial ends (connecting ends) of the pair of fluid devices 10 and 20 each have annular flange portions 11 and 21 with an increased outer diameter.

[0032] Furthermore, annular grooves 12 and 22 are formed at the connecting ends of the flow path holes 10a and 20a of the pair of fluid devices 10 and 20, respectively.

[0033] Examples of resin materials used to mold each component of the flow channel joint structure 1 include, but are not limited to, PFA (perfluoroalkoxyalkane), PTFE (polytetrafluoroethylene), ETFE (tetrafluoroethylene-ethylene copolymer), FEP (tetrafluoroethylene-hexafluoropropylene copolymer), PVDF (polyvinylidene fluoride), PPS (polyphenylene sulfide), PEEK (polyetheretherketone), PP (polypropylene), PE (polyethylene), PVC (polyvinyl chloride), POM (polyacetal), UHPE (ultra-high molecular weight polyethylene), etc.

[0034] For example, the internal pressure of the piping in a pair of fluid devices 10, 20 is 0 to 0.7 MPa, and the internal diameter of the piping is φ2 to φ33.7 mm, but is not limited to these values.

[0035] Examples of fluids to be circulated include, but are not limited to, sulfuric acid, hydrofluoric acid, pure water, hydrogen peroxide, ammonia, ozonated water, hydrochloric acid, IPA (isopropyl alcohol), and phosphoric acid.

[0036] The flow path holes 10a and 20a of this pair of fluid devices 10 and 20 are connected in a sealed state by the sealing member 30.

[0037] In the flow path joint structure 1, the outer circumferences of the pair of flange portions 11 and 21 are tightened by the connecting member 40 while the sealing member 30 is attached to the pair of fluid devices 10 and 20. Although not shown in detail, the connecting member 40 is, for example, a structure in which the base ends of a semi-circular first member and a second member are connected to each other by a hinge, as shown in Patent Document 2, but is not limited to that.

[0038] As shown in Figure 1B, which illustrates the pre-press-fit state where the insertion portions 32, 32 are pressed into the groove portions 12, 22, the sealing member 30 includes a cylindrical body portion 31 in which a communication hole 33 connecting a pair of flow path holes 10a, 20a is formed. The body portion 31 is, for example, an annular shape on the outer diameter side with a constant axial thickness, and widens on the inner diameter side so that the axial thickness gradually increases. The shape of the inner surface forming the communication hole 33 before press-fitting on the inner circumferential surface may be an arc shape in cross-section.

[0039] In this embodiment, the sealing member 30 is formed such that a pair of annular insertion portions 32, 32 protrude outward in the axial direction away from the main body portion 31 at a radially intermediate position of the main body portion 31. These pair of insertion portions 32, 32 are press-fitted into the annular groove portions 12, 22 of the pair of fluid devices 10, 20, respectively.

[0040] Furthermore, a feature of this embodiment is that, in the pre-press-fit state, the radial thickness (projection width) of the insertion portions 32, 32 gradually increases toward the axial outward direction.

[0041] On the other hand, the pair of grooves 12 and 22 also gradually decrease in radial size (groove width) from the axially outward side toward the axially inward side (Figure 1B shows only one groove 22, but the other groove 12 is similar).

[0042] Thus, because the radial thickness of the insertion portions 32, 32 is greater than the radial size of the groove portions 12, 22, in the post-press-fit state shown in Figure 1A, where the insertion portions 32, 32 are press-fitted into the groove portions 12, 22, the insertion portions 32, 32 are prevented from advancing axially inward relative to the groove portions 12, 22, thus preventing them from coming loose.

[0043] Therefore, the loosening of the connecting member 40 and the dislodgement of the insertion portions 32, 32 from the grooves 12, 22 are effectively suppressed, and the fluid flowing through the pair of fluid devices 10, 20 is less likely to leak.

[0044] Also, as shown in the enlarged view of only one side in FIG. 1A, in the state after press-fitting, the interference allowance D on the axially inner side of the interference area X where the side surfaces of the insertion portions 32, 32 and the wall surfaces of the groove portions 12, 22 interfere is larger than the interference allowance C on the axially outer side (C < D). Specifically, by adjusting the dimensional relationship between the radially inner surfaces 32a, 32a of the insertion portions 32, 32 and the radially inner surfaces 12a, 22a of the groove portions 22, the radially inner surfaces 32a, 32a of the insertion portions 32 in the state before press-fitting and the radially inner surfaces 12a, 22a of the groove portions 22 are more deformed axially inward.

[0045] Looking at it from another perspective, as shown in FIG. 1B as well, on the cut surface cut by a plane parallel to the axial direction in the state before press-fitting, the angle B at which the groove portions 12, 22 become larger toward the axially outer side is larger than the angle A at which the thickness of the insertion portions 32, 32 becomes thicker toward the axially outer side (A < B).

[0046] By configuring it in this way, when the insertion portions 32, 32 try to come out of the groove portions 12, 22, the interference allowance increases in the direction of making it difficult to come out, so there is an effect of being difficult to come out.

[0047] As described above, when the fluid flows inside the pair of fluid devices 10, 20 and the internal pressure of the pipe is applied, if the connecting member 40 loosens unintentionally, the pair of fluid devices 10, 20 tend to move away from each other due to the internal pressure of the pipe.

[0048] However, according to the flow path joint structure 1 according to the present embodiment, in the state after press-fitting where the insertion portions 32, 32 are press-fitted into the groove portions 12, 22, the insertion portions 32, 32 are prevented from moving in the direction of coming out of the groove portions 12, 22, so that the sealing performance can be maintained even when the tightening by the connecting member 40 is loosened.

[0049] In this embodiment, in the press-fitted state, the interference allowance in area X where the radially inner surfaces 32a, 32a of the insertion portions 32, 32 and the radially inner surfaces 12a, 22a of the groove portions 12, 22 interfere is kept greater than 0. However, in this embodiment, the interference allowance between the radially outer surfaces 32b, 32b of the insertion portions 32, 32 and the radially outer surfaces 12b, 22b of the groove portions 12, 22 is approximately 0. However, as shown in the following modifications 1 and 2, the interfering area may be provided only on the outside, or on both sides.

[0050] -Modification 1- Figures 2A and 2B show a flow path joint structure 1' according to Modification 1 of Embodiment 1 of the present invention, which differs from Embodiment 1 in that the location of the interfering area Y is different. In the following modifications and embodiments, the same reference numerals are used for the same parts as in Figures 1A to 1C, and their detailed descriptions are omitted.

[0051] In this modified flow path joint structure 1', the basic configuration is the same as that of the flow path joint structure 1 of the embodiment 1, but the radial outer surfaces 32b', 32b' of the pair of insertion portions 32', 32' are particularly thicker in the axial direction outward.

[0052] In this modified example, the radially inner surfaces 32a', 32a' of the sealing member 30' are substantially horizontal, unlike in the first embodiment, and the interference between them and the radially inner surfaces 12a', 22a' of the grooves 12', 22' is minimal or nonexistent.

[0053] In this modified example 1, as in the embodiment 1, in the post-press-fit state where the insertion portions 32', 32' are press-fitted into the groove portions 12', 22', the radial outer surfaces 32b', 32b' of the insertion portions 32', 32' interfere with the radial outer surfaces 12b', 22b' of the groove portions 12', 22' in area Y, preventing the insertion portions 32', 32' from moving out of the groove portions 12', 22'. This prevents them from coming loose, thus maintaining sealing performance even when the tightening by the connecting member 40 is loosened.

[0054] -Modification 2- Figures 3A and 3B show a flow path joint structure 1'' according to Modification 2 of Embodiment 1 of the present invention, which differs from Embodiment 1 in that interference areas are provided in both the radially inward interference area X and the radially outward interference area Y.

[0055] In this modified flow path joint structure 1'', the basic configuration is the same as the flow path joint structure 1 of the embodiment 1, but not only are the radial inner surfaces 32a'', 32a'' of the pair of insertion portions 32'', 32'' of the sealing member 30'' thicker toward the axial outer side, but the radial outer surfaces 32b'', 32b'' of the pair of insertion portions 32'', 32'' are also thicker toward the axial outer side. Figure 3B shows the areas X and Y where the radial inner surface 32a'' and radial outer surface 32b'' of one insertion portion 32'' interfere with the radial inner surface 22a'' and radial outer surface 22b'' of the groove portion 22'', but similar interference areas X and Y are provided on the opposite side as well.

[0056] In this modified example, as in Embodiment 1, in the post-press-fit state where the insertion portions 32'', 32'' are press-fitted into the groove portions 12'', 22'', both the radially inner surfaces 32a'', 32a'' and the radially outer surfaces 32b'', 32b'' are designed to prevent the insertion portions 32'', 32'' from moving out of the groove portions 12'', 22'', thereby maintaining better sealing performance even when the tightening by the connecting member 40 is loosened.

[0057] -Modification 3- Figure 4 shows a flow path joint structure 1''' according to Modification 3 of Embodiment 1 of the present invention, which differs from Embodiment 1 in that the inner diameters of the pair of fluid devices 10''' and 20''' are different.

[0058] In this modified example, the inner diameter of the flow hole 10a''' of the first fluid device 10''' is larger than the inner diameter of the flow hole 20a''' of the second fluid device 20'''. The outer diameters of the flange portions 11 and 21''' of the pair of fluid devices 10''' and 20''' are the same, and they are connected by a connecting member 40 similar to that of the first embodiment.

[0059] In this modified example, the shape of the sealing member 30'' is not symmetrical in the cross-section shown in Figure 4, and the wall surface forming the communication hole 33'' has a stepped shape.

[0060] Furthermore, the position of the first insertion portion 32''' is located radially outward from the position of the second insertion portion 32'''.

[0061] In this modified example, similar to Embodiment 1, an interference area X is provided only on the radially inner surfaces 32a''', 32a'''. However, as in Modified Example 1, an interference allowance may be provided only on the radially outer surfaces 32b''', 32b''', or as in Modified Example 2, it may be provided on both.

[0062] In this modified example, as in Embodiment 1, in the post-press-fit state where the insertion portions 32''', 32''' are press-fitted into the groove portions 12''', 22''', the insertion portions 32''', 32''' are prevented from moving out of the groove portions 12''', 22''' by being secured in a manner that prevents them from coming out. This allows for better sealing performance even when the tightening by the connecting member 40 is loosened.

[0063] -Modification 4- Figure 5 shows a flow path joint structure 1'''' according to Modification 4 of the embodiment of the present invention, which differs from Embodiment 1 in that the sealing member is integrated with the flange 21'''' of the second fluid device 20''''.

[0064] Although the sealing member does not exist as a separate part, if we consider that the sealing member is included in the flange 21'''' of the second fluid device 20'''', then it can be said that it has the same configuration and effect as the left-side insertion portion 32 of the first embodiment.

[0065] In this modified example, similar to Embodiment 1, interference clearance is provided only on the radially inner surface 32a'''' side. However, as in Modified Example 2, interference clearance may be provided only on the radially outer surface 32b'''', or on both sides as in Modified Example 3.

[0066] In this modified example, as in the first embodiment, in the post-press-fit state where the insertion portion 32''' on the second fluid device 20'''' side is press-fitted into the groove 12'''', the insertion portion 32'''' is prevented from moving out of the groove 12'''' by being secured in a way that prevents it from coming out. This allows for better sealing performance even when the tightening by the connecting member 40 is loosened.

[0067] (Embodiment 2) Figure 6 shows a flow path joint structure 101 according to Embodiment 2 of the present invention, which differs from Embodiment 1 in that the connection structure of the pair of fluid devices 110 and 120 is different.

[0068] In this embodiment, the pair of fluid devices 110 and 120 do not have flange portions formed on them. In addition, a male threaded portion 111 is formed on the tip 120b of the second fluid device 120.

[0069] With a cylindrical sealing member 130 inserted into the tip 120b of the second fluid device 120, the tip 110b of the first fluid device 110 is inserted between the outer circumferential surface 130a of the sealing member 130 and the inner circumferential surface of the tip 120b of the second fluid device 120.

[0070] In this state, the female threaded portion 121 on the inner circumference of the connecting member 140 is engaged with the male threaded portion 111 on the outer circumference of the second fluid device 120 and tightened, thereby connecting the first fluid device 110 and the second fluid device 120 via the sealing member 130, connecting the flow path holes 110a, 120a and the communication hole 133.

[0071] The sealing member 130 has a cylindrical main body portion 131, and a protruding insertion portion 132 is formed at the tip of the second fluid device 120 side.

[0072] On the other hand, the second fluid device 120 has a groove 122 formed at a position corresponding to the insertion portion 132.

[0073] In this embodiment as well, similar to Embodiment 1, an area X is provided where the radially inner surface 132a of the insertion portion 132 and the radially inner surface 122a of the groove portion 122 interfere.

[0074] In this embodiment as well, in the pre-press-fit state, which is the state before the insertion portion 132 is press-fitted into the groove portion 122, the radial thickness of the insertion portion 132 gradually increases toward the axially outward direction, while the radial size of the groove portion 122 gradually decreases toward the axially inward direction.

[0075] Furthermore, because the radial thickness of the insertion portion 132 is greater than the size of the groove portion 122, in the post-press-fit state where the insertion portion 132 is press-fitted into the groove portion 122, the insertion portion 132 is prevented from advancing axially inward relative to the groove portion 122, thus preventing it from coming loose.

[0076] The relationship between the radially inner surface 132a of the insertion portion 132 and the radially inner surface 122a of the groove portion 122 is the same as the relationship described in Embodiment 1. For example, in the press-fitted state, the interference allowance in the area X where the radially inner surface 132a of the insertion portion 132 and the radially inner surface 122a of the groove portion 122 interfere is greater in the axially inner interference allowance D than in the axially outer interference allowance C (C < D).

[0077] Furthermore, as in Modification 1 of Embodiment 1, the interference allowance may be provided only on the radially outer surface 132b side of the insertion portion 132, or as in Modification 2, it may be provided on both the radially inner surface 132a and the radially outer surface 132b of the insertion portion 132.

[0078] In this embodiment as well, similar to the first embodiment, in the post-press-fit state where the insertion portion 132 is press-fitted into the groove portion 122, the insertion portion 132 is prevented from moving out of the groove portion 122 by being secured in a manner that prevents it from coming out. This ensures that the sealing performance can be maintained even when the tightening by the connecting member 40 is loosened.

[0079] (Embodiment 3) Figure 7 shows a flow path joint structure 201 according to Embodiment 3 of the present invention, which differs from Embodiment 1 in that grooves 212 and 222 are formed in the sealing member 230.

[0080] The flow path joint structure 201 of this embodiment includes a pair of fluid devices 210 and 220.

[0081] The flow path joint structure 201 of this embodiment includes a sealing member 230 that connects the flow path holes 210a and 220a formed in the pair of fluid devices 210 and 220, respectively, while sealing them. The sealing member 230 has a cylindrical body portion 231 in which a communication hole 233 connecting the pair of flow path holes 210a and 220a is formed, and groove portions 212 and 222 recessed inward toward the axial center side of the body portion 231.

[0082] Furthermore, the flow path joint structure 201 of this embodiment includes a connecting member 40 that tightens and connects a pair of fluid devices 210 and 220 while the sealing member 230 is attached to the pair of fluid devices 210 and 220.

[0083] The connecting ends of the flow path holes 210a and 220a of the first fluid device are formed with annular insertion portions 232 and 232 that are press-fitted into the grooves 212 and 222.

[0084] Thus, in this embodiment, the insertion portions 232, 232 are arranged radially outward from the pair of flow path holes 210a, 220a, extending toward each other, and the grooves 212, 222 are arranged to open toward the opposite side of the sealing member 230 in the axial direction, in accordance with the pair of insertion portions 232, 232.

[0085] In the pre-press-fit state, before these insertion portions 232, 232 are press-fitted into the groove portions 212, 222, the radial thickness of the insertion portions 232, 232 gradually increases toward the axially inward direction, while the radial spacing between the groove portions 212, 222 gradually increases toward the axially outward direction.

[0086] Furthermore, because the radial thickness of the insertion portions 232, 232 is greater than the size of the groove portions 212, 222, the insertion portions 232, 232 are prevented from advancing axially outward relative to the groove portions 212, 222 in the post-press-fit state where the insertion portions 232, 232 are press-fitted into the groove portions 212, 222, thus preventing them from coming loose.

[0087] In this embodiment, the insertion portions 232, 232 are retained to prevent them from advancing axially outward relative to the groove portions 212, 222. This effectively prevents the connecting member 40 from loosening and the insertion portions 232, 232 from coming out of the groove portions 212, 222, thus reducing the likelihood of fluid leakage from the pair of fluid devices 210, 220.

[0088] In the press-fitted state, the interference margin where the radially inner surfaces 232a, 232a of the insertion portions 232, 232 and the radially inner surfaces 212a, 222a of the groove portions 212, 222 overlap is greater in the axially outer direction than in the axially inner direction (C < D).

[0089] In other words, when the insertion parts 232, 232 try to come out, the interference margin increases, which makes it difficult for them to come out.

[0090] Furthermore, although not shown in detail in the diagram, in the pre-press-fit state, in the cut surface made by cutting with a plane parallel to the axial direction, the angle at which the grooves 212, 222 increase in the axial direction is greater than the angle at which the thickness of the insertion portions 232, 232 increases in the axial direction inward.

[0091] Therefore, in the flow path joint structure 201 according to this embodiment, in the post-press-fit state in which the insertion portions 232, 232 are press-fitted into the groove portions 212, 222, the insertion portions 232, 232 are prevented from moving out of the groove portions 212, 222, thereby maintaining sealing performance even when the tightening by the connecting member 40 is loosened.

[0092] The embodiments described above are essentially preferred examples and are not intended to limit the scope of the present invention, its applications, or uses.

[0093] 1, 1', 1'', 1'''', 1'''', 101, 201 Fluid coupling structure 10, 10''', 110, 210 First fluid device 10a, 10a''', 110a, 210a Flow holes 11, 21, 21', 21'''' Flange portion 12, 12', 12''', 12'''', 12'''', 112, 212 Groove portion 12a, 22a, 12a', 22a', 122a, 212a, 222a Radially inner surface 12b, 22b, 12b', 22b' Radially outer surface 20, 20''', 20'''', 120, 220 Second fluid device 20a, 20a''', 20a'''', 120a, 220a Flow holes 22, 22', 22'', 22'''', 122, 222 Groove 30, 30', 30'', 30'''', 130, 230 Sealing member 31, 131, 231 Main body 32, 32', 32'', 32''', 32''', 132, 232 Insertion part 32a, 32a', 32a'', 32a''', 32a'''', 132a, 232a Radial inner surface 32b, 32b', 32b'', 32b'''', 32b'''' Radial outer surface 33, 33''', 133, 233 Communication hole 40, 140 Connecting member 110b Tip 111 Male threaded part 121 Female threaded part 120b Tip 130a Outer surface 132b Radial outer surface

Claims

1. A flow joint structure comprising a pair of fluid devices, a sealing member for connecting the flow holes formed in each of the pair of fluid devices while sealing them, and a connecting member for tightening and connecting the pair of fluid devices while the sealing member is attached to the pair of fluid devices, wherein the sealing member comprises a cylindrical body portion having a communication hole that connects the pair of flow holes, and an annular insertion portion that protrudes axially outward in the direction away from the body portion and is press-fitted into an annular groove formed at the connecting end of the flow hole of one of the fluid devices, wherein in the pre-press-fit state, the thickness of the insertion portion gradually increases radially toward the axial outward direction, and / or the size of the groove gradually decreases radially toward the axial inward direction opposite to the axial outward direction, and the radial thickness of the insertion portion is greater than the radial size of the groove, wherein in the post-press-fit state, the insertion portion is press-fitted into the groove, A flow path joint structure in which the insertion portion is prevented from advancing axially inward relative to the groove portion.

2. The flow path joint structure according to claim 1, wherein, in the state after press-fitting, the interference allowance between the insertion portion and the wall surface of the groove portion is greater on the axially inward side than on the axially outward side.

3. The flow path joint structure according to claim 1, wherein, in the state before press-fitting, in the cut surface obtained by cutting with a plane parallel to the axial direction, the angle at which the groove portion becomes larger toward the axial side is greater than the angle at which the thickness of the insertion portion becomes thicker toward the axial side 4. The insertion portions are arranged on both sides of the main body so as to extend away from each other in an axial direction, and the groove portion is arranged radially outward of the pair of flow path holes in accordance with the pair of insertion portions, as described in claim 1.

5. A flow joint structure comprising a pair of fluid devices, a sealing member for connecting the flow holes formed in each of the pair of fluid devices while sealing them, and a connecting member for tightening and connecting the pair of fluid devices while the sealing member is attached to the pair of fluid devices, wherein the sealing member has a cylindrical body portion in which a communication hole connecting the pair of flow holes is formed, and a groove portion recessed in the axial direction toward the axial center of the body portion, and an annular insertion portion formed at the connecting end of the flow hole of one of the fluid devices which is press-fitted into the groove portion, wherein in the pre-press-fit state, the thickness of the insertion portion gradually increases in the radial direction toward the axial connection of the fluid devices, A flow path joint structure in which the insertion portion is prevented from advancing axially outward relative to the groove portion.

6. The flow path joint structure according to claim 5, wherein the interference allowance between the insertion portion and the wall surface of the groove portion in the press-fitted state is greater on the axially outward side than on the axially inward side.

7. The flow path joint structure according to claim 5, wherein, in the state before press-fitting, in the cut surface obtained by cutting with a plane parallel to the axial direction, the angle at which the groove portion becomes larger toward the axial direction is greater than the angle at which the thickness of the insertion portion becomes thicker toward the axial direction toward the inward direction.

8. The flow path joint structure according to claim 5, wherein the insertion portions are arranged radially outward from the pair of flow path holes and extend toward each other, and the grooves are arranged to open toward the opposite side of the axial direction of the sealing member in accordance with the pair of insertion portions.

9. The flow path joint structure according to any one of claims 1 to 8, wherein the interference allowance between the insertion portion and the wall surface of the groove portion in the press-fit state is greater than 0 on at least one of the radially inner and radially outer sides of the insertion portion.

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