Flow path joint structure

Abstract

In a flow path joint structure, the sealing performance is maintained even when the tightening by the connecting member is loosened. [Solution] The sealing member 30 is provided with a cylindrical main body 31 having a communication hole 33 connecting a pair of flow path holes 10a and 20a, and annular insertion parts 32, 32 that protrude axially outward away from the main body 31 and are press-fitted into annular grooves 12, 22 formed at the connecting ends of the flow path holes 10a and 20a of one of the fluid devices. In the pre-press-fit state, the radial thickness of the insertion parts gradually increases toward the axial outward direction, and the radial size of the grooves gradually decreases toward the axial inward direction opposite to the axial outward direction. Since the radial thickness of the insertion parts is greater than the radial size of the grooves, in the post-press-fit state, the insertion parts are prevented from advancing axially inward relative to the grooves and are thus prevented from coming loose.

Description

Technical Field

[0005] ,

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

Background Art

[0002] Conventionally, for example, as disclosed in Patent Document 1, a seal member that seals and connects the flow path holes formed in two fluid devices is known. This seal member includes a cylindrical main body portion having a communication hole that communicates the flow path holes with each other, and an annular seal portion 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-fit state, which is the 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 seal member is inserted between two fluid devices, they are connected by a connecting member shown in, for example, Patent Document 2.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

[0006] The present invention has been made in view of the above, and its purpose is to enable the sealing performance to be maintained even when the tightening by the connecting member is loosened. [Means for solving the problem]

[0007] To achieve the aforementioned objective, this invention incorporates improvements to the interference margin between the insertion portion and the groove portion.

[0008] Specifically, in the first invention, A pair of fluid devices, A sealing member that connects the flow path holes formed in each of the pair of fluid devices while sealing them, The present invention relates to a flow path joint structure comprising a sealing member 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] And the sealing member is, A cylindrical body portion having a communication hole formed that connects a pair of the aforementioned flow path holes, It comprises 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 the flow path hole of one of the fluid devices, In the pre-press-fit state, which is the state before the insertion portion is pressed into the groove, The thickness of the insertion portion gradually increases in the radial direction toward the axial outward direction, and / or The groove portion has a gradually decreasing radial size from the axially outward side to the axially inward side opposite to the axially outward side. Because the radial thickness of the insertion portion is greater than the radial size of the groove portion, In the post-press-fit state, where the insertion portion is pressed into the groove, The aforementioned insertion portion is retained to prevent it 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.

[0013] In the third invention, in the first invention, In the state before press-fitting, the cut surface obtained by cutting with a plane parallel to the axial direction, The angle at which the thickness of the insertion portion increases toward the axially outward direction is greater than the angle at which the thickness of the insertion portion increases toward the axially outward direction. The angle at which the groove portion increases in the axial direction outward is greater.

[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 loose.

[0015] In the fourth invention, in the first invention, The aforementioned insertion portions are arranged so as to extend in directions away from each other on both axial sides of the main body. The groove is positioned radially outward of the pair of flow path holes, in accordance with the pair of insertion portions.

[0016] According to the above configuration, since it is difficult for either of the pair of insertion portions to come out, it is further suppressed that the insertion portion comes out of the groove portion, and the fluid flowing through the pair of fluid devices is less likely to leak.

[0017] In the fifth invention, a pair of fluid devices, a sealing member that connects the pair of fluid devices in a state where the flow path holes formed in the pair of fluid devices are sealed, and a connecting member that tightens and connects the pair of fluid devices in a state where the sealing member is attached to the pair of fluid devices, and the flow path joint structure is targeted.

[0018] And the sealing member has a cylindrical main body portion in which a communication hole communicating the pair of flow path holes is formed, and a groove portion recessed from the axial center side of the main body portion toward the inner side in the axial direction, an annular insertion portion that is press-fitted into the groove portion is formed at the connection end portion of the flow path hole of one of the fluid devices, in the pre-press-fitting state, which is the state before the insertion portion is press-fitted into the groove portion, the thickness in the radial direction of the insertion portion gradually increases toward the inner side in the axial direction, <� the groove portion gradually decreases in size in the radial direction toward the outer side in the axial direction, since the thickness in the radial direction of the insertion portion is larger than the size of the groove portion, in the post-press-fitting state, which is the state where the insertion portion is press-fitted into the groove portion, the insertion portion is prevented from moving toward the outer side in the axial direction with respect to the groove portion, and is prevented from coming out.

[0019] According to the above configuration, since the insertion portion on the fluid device side is prevented from moving toward the outer side in the axial direction with respect to the groove portion on the sealing member side and is prevented from coming out, it is effectively suppressed that the connecting member loosens and the insertion portion comes out of the groove portion, and the fluid flowing through the pair of fluid devices is less likely to leak.

[0020] In the sixth invention, in the fifth 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 outward side than on the axially inward side.

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

[0022] In the seventh invention, in the fifth invention, In the state before press-fitting, the cut surface obtained by cutting with a plane parallel to the axial direction, The angle at which the thickness of the insertion portion increases toward the axially inward direction is greater than the angle at which the thickness of the insertion portion increases toward the axially inward direction. The angle at which the groove portion increases inward in the axial direction is greater.

[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.

[0024] In the eighth invention, in the fifth invention, The aforementioned insertion portions are arranged radially outward from the pair of flow path holes, so as to extend toward each other. The grooves are positioned to open on opposite sides 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, the likelihood 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, In the state after press-fitting, the interference margin between the insertion portion and the wall surface of the groove portion 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. [Effects of the Invention]

[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. [Brief explanation of the drawing]

[0029] [Figure 1A] This is an enlarged cross-sectional view showing a part of the flow path joint structure according to Embodiment 1 of the present invention. [Figure 1B] This is a magnified cross-sectional view showing how the insertion part is inserted into the groove. [Figure 1C] This is a cross-sectional view showing a flow path joint structure according to Embodiment 1 of the present invention. [Figure 2A] This is an enlarged cross-sectional view showing a part of a flow path joint structure according to a modified example 1 of Embodiment 1 of the present invention. [Figure 2B] This is a cross-sectional view showing an enlarged view of how the insertion part is inserted into the groove, according to Modification 1. [Figure 3A] This is an enlarged cross-sectional view showing a part of a flow path joint structure according to a modified example 2 of Embodiment 1 of the present invention. [Figure 3B] This is a cross-sectional view showing an enlarged view of how the insertion part is inserted into the groove, according to Modification 2. [Figure 4] This is an enlarged cross-sectional view showing a part of the flow path joint structure according to a modified example 3 of Embodiment 1 of the present invention. [Figure 5] This is an enlarged cross-sectional view showing a part of the flow path joint structure according to a modified example 4 of Embodiment 1 of the present invention. [Figure 6] This is an enlarged cross-sectional view showing a part of the flow path joint structure according to Embodiment 2 of the present invention. [Figure 7]This is an enlarged cross-sectional view showing a part of the flow path joint structure according to Embodiment 3 of the present invention. [Modes for carrying out the 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 are each formed with 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 that can 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 while being sealed 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 may, for example, have an annular shape on the outer diameter side with a constant axial thickness, and widen on the inner diameter side so that the axial thickness gradually increases, and the shape of the inner surface that forms the pre-press-fit communication hole 33 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 axially outward 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 groove portions 12 and 22 also have a gradually decreasing radial size (groove width) toward the inner side in the axial direction, opposite to the outer side in the axial direction (only one groove portion 22 is shown in FIG. 1B, but the other groove portion 12 is the same).

[0042] In this way, since the radial thickness of the insertion portions 32 and 32 is larger than the radial size of the groove portions 12 and 22, in the press-fitting state shown in FIG. 1A where the insertion portions 32 and 32 are press-fitted into the groove portions 12 and 22, the insertion portions 32 and 32 are prevented from advancing toward the inner side in the axial direction with respect to the groove portions 12 and 22 and are retained.

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

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

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

[0046] By configuring in this way, when the insertion portions 32 and 32 try to come out, 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 explained above, if the connecting member 40 unintentionally loosens while fluid is flowing through the pair of fluid devices 10 and 20 and pressure is applied inside the piping, the pressure inside the piping will cause the pair of fluid devices 10 and 20 to move away from each other.

[0048] However, according to the flow path joint structure 1 of this embodiment, in the post-press-fit state in which 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 such a way 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 almost 0. However, as shown in the following modified examples 1 and 2, the interfering area may be provided only on the outside or on both sides.

[0050] -Experimental Variation 1- Figures 2A and 2B show a flow path joint structure 1' according to a modified example 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 modified examples and embodiments, the same reference numerals are used for parts that are the same as those 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 Embodiment 1, but the radially 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 radial inner surfaces 32a', 32a' of the sealing member 30' are substantially horizontal, unlike in Embodiment 1, and the interference between them and the radial 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] -Variation 2- Figures 3A and 3B show a flow path joint structure 1'' according to a modified example 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 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'' 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 portion 32'',32'' is press-fitted into the groove portion 12'',22'', both the radially inner surface 32a'',32a'', and the radially outer surface 32b'',32b'', are designed to prevent the insertion portion 32'',32'' from moving out of the groove portion 12'',22'', thereby maintaining better sealing performance even when the tightening by the connecting member 40 is loosened.

[0057] -Variation 3- Figure 4 shows a flow path joint structure 1''' according to a 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''', 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'''', 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 surface 32a''',32a''' side. However, as in Modified Example 1, an interference allowance may be provided only on the radially outer surface 32b''',32b''', or as in Modified Example 2, it may be provided on both sides.

[0062] In this modified example, as in Embodiment 1, in the post-press-fit state where the insertion portion 32''',32''' is press-fitted into the groove portion 12''',22''', the insertion portion 32''',32''' is prevented from moving out of the groove portion 12''',22''' by being secured in such a way that the sealing performance can be maintained even when the tightening by the connecting member 40 is loosened.

[0063] -Variation 4- Figure 5 shows a flow path joint structure 1'''' according to a modified example 4 of the present invention, which differs from the first embodiment 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 Embodiment 1.

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

[0066] In this modified example, as in Embodiment 1, 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, the insertion portion 132 is prevented from advancing axially inward relative to the groove portion 122 in the post-press-fit state where the insertion portion 132 is press-fitted into the groove portion 122.

[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 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 Embodiment 1, 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 loose. 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 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 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.

[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 toward the inward side.

[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. [Explanation of symbols]

[0093] 1,1',1'',1''',1'''',101,201 Fluid coupling structure 10,10''',110,210 First fluid device 10a,10a''',110a,210a Distribution hole 11,21,21''',21'''' Flange section 12,12',12'',12''',12'''',112,212 groove section 12a,22a,12a',22a',122a,212a,222a Radial inner surface 12b,22b,12b',22b' Radial outer surface 20,20''',20'''',120,220 Second fluid device 20a,20a''',20a'''',120a,220a Distribution hole 22,22',22'',22''',122,222 groove section 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 members 110b tip 111 Male threaded section 121 Female thread section 120b tip 130a Outer surface 132b Radial outer surface

Claims

1. A pair of fluid devices, A sealing member that connects the flow path holes formed in each of the pair of fluid devices while sealing them, A flow path joint structure comprising a connecting member that tightens and connects the pair of fluid devices while the sealing member is attached to the pair of fluid devices, The sealing member is A cylindrical body portion having a communication hole formed that connects a pair of the aforementioned flow path holes, It comprises 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 the flow path hole of one of the fluid devices, In the pre-press-fit state, which is the state before the insertion portion is pressed into the groove, The thickness of the insertion portion gradually increases in the radial direction toward the axial outward direction, and / or The groove portion has a gradually decreasing radial size from the axially outward side to the axially inward side opposite to the axially outward side. Because the radial thickness of the insertion portion is greater than the radial size of the groove portion, In the post-press-fit state, where the insertion portion is pressed into the groove, The aforementioned insertion portion is retained to prevent it from advancing axially inward relative to the groove. Flow channel joint structure.

2. 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. The flow path joint structure according to claim 1.

3. In the state before press-fitting, the cut surface obtained by cutting with a plane parallel to the axial direction, The angle at which the thickness of the insertion portion increases toward the axially outward direction is greater than the angle at which the thickness of the insertion portion increases toward the axially outward direction. The angle at which the groove increases toward the axial outward direction is greater. The flow path joint structure according to claim 1.

4. The aforementioned insertion portions are arranged so as to extend away from each other on both sides of the main body in the axial direction. The groove is positioned radially outward of the pair of flow holes, in accordance with the pair of insertion portions. The flow path joint structure according to claim 1.

5. A pair of fluid devices, A sealing member that connects the flow path holes formed in each of the pair of fluid devices while sealing them, A flow path joint structure comprising a connecting member that tightens and connects the pair of fluid devices while the sealing member is attached to the pair of fluid devices, The sealing member is A cylindrical body portion having a communication hole that connects a pair of the aforementioned flow path holes, The main body portion has a groove that is recessed toward the axially inward side on the axial center side, On the other hand, the connecting end of the flow path hole of the fluid device has an annular insertion portion that is press-fitted into the groove. In the pre-press-fit state, which is the state before the insertion portion is pressed into the groove, The thickness of the insertion portion gradually increases in the radial direction toward the axially inward direction, The groove portion has a gradually decreasing radial size towards the axial outward direction. Because the radial thickness of the insertion portion is greater than the size of the groove portion, In the post-press-fit state, where the insertion portion is pressed into the groove, The aforementioned insertion portion is retained to prevent it from advancing axially outward relative to the groove. Flow channel joint structure.

6. 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 outward side than on the axially inward side. The flow path joint structure according to claim 5.

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

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

9. In the state after press-fitting, the interference margin between the insertion portion and the wall surface of the groove portion is greater than 0 on at least one of the radially inner and radially outer sides of the insertion portion. A flow path joint structure according to any one of claims 1 to 8.

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