Piping device

Abstract

A piping device 10 according to the present invention comprises three or more flow passage forming parts 1-3, a bolt 9, a shaft seal 5 between the flow passage forming parts 1, 2, and a surface seal 6 between the flow passage forming parts 2, 3. The flow passage forming part 1 has an annular protrusion 7, and the flow passage forming part 2 has an annular recess 8. The flow passage forming parts 2 and 3 are respectively provided with opposing surfaces 15, 16 facing each other in a direction along the axial direction of the bolt 9. The flow passage forming parts 1 and 2 are provided with an insertion hole 11 through which the bolt 9 is inserted and positioned. The flow passage forming part 3 is positioned with respect to the flow passage forming part 1 by using the bolt 9.

Description

Piping equipment

[0001] The present invention relates to a piping device in which three or more flow path forming portions are connected via seals.

[0002] Conventionally, a piping device has been known in which flow path forming sections that form a continuous flow path are connected with bolts and sealed with O-rings or the like to prevent fluid flowing inside from leaking through gaps between the flow path forming sections (see, for example, Patent Document 1).

[0003] JP 2012-92674 A

[0004] When three or more flow path forming sections that form a continuous flow path are connected in series with bolts via seals, if the flow path forming sections are misaligned when connecting adjacent flow path forming sections with bolts, a step will be created in the flow path between the flow path forming sections.If such misalignment occurs between adjacent flow path forming sections, even if the misalignment between each section is small, the misalignment may be extremely large between the flow path forming sections located at both ends of a piping device consisting of three or more flow path forming sections, which could increase the flow path resistance of the piping device.

[0005] In view of the above, the present invention aims to provide a piping device in which three or more flow path forming parts are connected in series via seals, which can suppress an increase in flow path resistance due to accumulated positional misalignment during assembly.

[0006] In order to achieve the above object, a piping device of a first aspect of the present invention is a piping device comprising: three or more flow path forming sections in which a continuous flow path is formed; a bolt inserted across all of the flow path forming sections and connecting all of the flow path forming sections in series; an axial seal provided somewhere between adjacent flow path forming sections to prevent liquid leakage from the flow path; and a face seal provided at a location between adjacent flow path forming sections where there is no axial seal to prevent liquid leakage from the flow path, wherein one of the adjacent flow path forming sections in which the axial seal is arranged has an annular protrusion, and the other of the adjacent flow path forming sections in which the axial seal is arranged has an annular recess into which the annular protrusion is inserted, the axial seal is housed in the annular recess and pressed against an outer periphery of the annular protrusion, the adjacent flow path forming sections in which the face seal is arranged each have opposing surfaces that face each other in a direction along the axial line of the bolt, and the face seal is pressed between the opposing surfaces, One of the adjacent flow path forming portions in which the shaft seal is arranged has an insertion hole through which the bolt is inserted to position it, and at least one of the adjacent flow path forming portions in which the face seal is arranged is positioned with the flow path forming portion having the insertion hole by the bolt.

[0007] According to the present invention, adjacent flow passage forming portions in which shaft seals are disposed can be centered by the annular convex portion, the annular concave portion, and the shaft seal. Therefore, the gap between the bolt and the insertion hole formed in adjacent flow passage forming portions in which shaft seals are disposed can be reduced because misalignment of the insertion hole can be suppressed. This allows the bolt to function as a positioning pin, allowing the center of adjacent flow passage forming portions in which face seals are disposed to be aligned. Therefore, according to the present invention, misalignment of three or more flow passage forming portions can be suppressed more than in the past, and flow passage resistance can be reduced.

[0008] In the piping device of the first aspect of the present invention, the bolt may have a step portion, and the step portion may be in contact with the opposing surface.

[0009] With this configuration, the force applied to the bolt can be received by the opposing surface via the step portion, thereby improving the durability of the piping device as a whole.

[0010] a bolt inserted across all of the flow path forming sections and connecting all of the flow path forming sections in series; an axial seal provided somewhere between adjacent flow path forming sections to prevent liquid leakage from the flow path; and a face seal provided at a location between adjacent flow path forming sections where there is no axial seal to prevent liquid leakage from the flow path, wherein one of the adjacent flow path forming sections in which the axial seal is arranged has an annular protrusion, and the other of the adjacent flow path forming sections in which the axial seal is arranged has an annular recess into which the annular protrusion is inserted, the axial seal is housed in the annular recess and pressed against an outer periphery of the annular protrusion, the adjacent flow path forming sections in which the face seal is arranged each have opposing surfaces that face each other in an axial direction of the bolt, and the face seal is pressed between the opposing surfaces, the bolt has a male thread portion at a tip, One of the flow path forming portions is provided with a nut having a female thread portion into which the male thread portion screws, the nut is provided on the flow path forming portion so as to protrude from one of the opposing surfaces, the flow path forming portion having the other opposing surface has a receiving portion that receives the nut, and the flow path forming portion having the nut and the flow path forming portion having the receiving portion are positioned by the nut and the receiving portion fitting together.

[0011] According to the present invention, adjacent flow passage forming portions where shaft seals are arranged can be centered by the annular protrusion, the annular recess, and the shaft seal. Also, adjacent flow passage forming portions where face seals are arranged can be centered by the nut and the receiving portion. Therefore, according to the present invention, misalignment of three or more flow passage forming portions can be reduced more than in the past, and flow passage resistance can be reduced.

[0012] In addition, in the piping device of the second aspect of the present invention, the bolt may have a step portion located closer to the base end than the male thread portion, and the step portion may be in contact with the nut.

[0013] With this configuration, the force applied to the bolt can be received by the nut, thereby improving the durability of the piping device as a whole.

[0014] 1 is a plan view showing a piping device according to an embodiment of the present invention; FIG. 2 is a combined cross-sectional view of the piping device according to the embodiment taken along lines A, B, C, and D in FIG. 1; FIG. 3 is a cross-sectional view of the piping device according to the embodiment taken along lines E and F in FIG. 1; and FIG. 4 is a perspective view showing the piping device according to the embodiment.

[0015] 1, a piping device 10 of this embodiment includes a first flow path forming portion 1 made of synthetic resin, a second flow path forming portion 2 made of synthetic resin, a third flow path forming portion 3 made of synthetic resin, and a metal bolt 9, and the first to third flow path forming portions 1 to 3 are connected in series by the bolt 9 to form a continuous flow path.

[0016] The piping device 10 includes an axial seal 5 made of an elastic material such as rubber and disposed between the first flow path forming portion 1 and the second flow path forming portion 2, and a face seal 6 made of an elastic material such as rubber and disposed between the second flow path forming portion 2 and the third flow path forming portion 3. The second flow path forming portion 2 is a housing that houses an on-off valve (not shown). Note that the flow path forming portion of the present invention is not limited to a housing that houses an on-off valve, and can be similarly applied to other objects.

[0017] The first flow path forming section 1 is provided with an annular protrusion 7 extending toward the second flow path forming section 2. The second flow path forming section 2 is provided with an annular recess 8 fitted onto the outer circumferential surface of the annular protrusion 7. A shaft seal 5 is disposed between the outer circumferential surface of the annular protrusion 7 and the inner circumferential surface of the annular recess 8.

[0018] The first flow path forming section 1 has a plurality of first insertion holes 11 through which bolts 9 are inserted. The second flow path forming section 2 has a plurality of second insertion holes 12 through which the bolts 9 inserted into the first insertion holes 11 are inserted. The third flow path forming section 3 has a female thread portion 13a that threadably engages with the bolts 9 inserted into the first insertion holes 11 and the second insertion holes 12.

[0019] The second flow path forming section 2 has a first opposing surface 15 which is a plane perpendicular to a connection direction 14 and connected to the third flow path forming section 3. The third flow path forming section 3 has a second opposing surface 16 which is a plane facing the first opposing surface 15. A face seal 6 is sandwiched between the first opposing surface 15 and the second opposing surface 16 to seal the second flow path forming section 2 and the third flow path forming section 3.

[0020] The bolt 9 is a so-called stepped bolt with a step 9a, and has a male thread 9b on its outer circumferential surface at the tip end, which is formed with a smaller diameter than the step 9a. The third flow path forming section 3 is formed by insert molding a metal nut 13 with a female thread 13a set in a mold and then integrally molding it with synthetic resin. The nut 13 partially protrudes from the second opposing surface 16 to form a protruding portion 13b. The step 9a of the bolt 9 contacts the tip surface of the protruding portion 13b of the nut 13. This allows the force applied to the bolt 9 to be received by the metal nut 13, which serves as part of the second flat surface 16, via the step 9a, thereby improving the durability of the piping device 10. Note that the nut 13 does not necessarily have to be made of metal.

[0021] Generally, when three flow path forming sections are connected with bolts, the insertion holes through which the bolts are inserted must be formed with a large diameter so that a relatively large gap is provided compared to the outer diameter of the bolts, in order to allow for some leeway in consideration of the finish of the insertion hole positions of each flow path forming section.

[0022] However, according to the piping device 10 of this embodiment, the first flow path forming portion 1 and the second flow path forming portion 2 can be centered by the annular convex portion 7, the annular concave portion 8, and the shaft seal 5. Therefore, misalignment between the first insertion hole 11 and the second insertion hole 12 can be suppressed, allowing the diameter of either the first insertion hole 11 or the second insertion hole 12 to be increased to increase the positional dimensional tolerance, thereby improving the productivity of the piping device 10. Furthermore, the other of the first insertion hole 11 or the second insertion hole 12 (the one with the larger diameter) can be used to allow the bolt 9 to function as a positioning pin. This allows the third flow path forming portion 3, which includes the female thread portion 13a into which the bolt 9 is threaded, to be centered with the first flow path forming portion 1 and the second flow path forming portion 2. Therefore, according to the piping device 10 of this embodiment, misalignment between the first to third flow path forming portions 1 to 3 can be suppressed more than in the past while improving productivity, thereby reducing the flow path resistance of the fluid flowing inside the piping device 10.

[0023] Furthermore, according to the piping device 10 of this embodiment, the face seal 6 is disposed between the first opposing surface 15 and the second opposing surface 16, which face each other, and therefore the opening area of ​​the flow path can be increased, thereby miniaturizing the overall component size of the piping device 10 while keeping the pressure loss of the piping device 10 low. Furthermore, the face seal 6 can have various shapes, improving the design flexibility of the face seal 6. Furthermore, because the face seal 6 generates a biasing force in a direction separating the first opposing surface 15 and the second opposing surface 16, a force is also applied to the bolt 9 and the female thread portion 13a in a direction separating them, preventing loosening of the engagement between the bolt 9 and the female thread portion 13a.

[0024] The second flow path forming portion 2 has a receiving portion 17 located on the first opposing surface 15 side. The receiving portion 17 functions as a positioning portion by receiving the protruding portion 13b of the nut 13 and fitting with the protruding portion 13b. In this embodiment, the first flow path forming portion 1 and the second flow path forming portion 2 are positioned by the annular convex portion 7 and the annular concave portion 8, and the second flow path forming portion 2 and the third flow path forming portion 3 are positioned by the protruding portion 13b and the receiving portion 17. For this reason, positioning by the bolt 9 is not necessarily required, and the bolt 9 can also be assembled to the first to third flow path forming portions 1 to 3 last.

[0025] In this embodiment, since the first flow path forming section 1 and the third flow path forming section 3 are positioned by the bolt 9, the protrusion 13b and the receiving section 17 may be omitted. In this case, the bolt 9 is positioned by being threaded into a female threaded portion provided in the third flow path forming section 3. The positioning of the bolt 9 and the third flow path forming section 3 is not limited to being by threading. For example, the third flow path forming section 3 may have an insertion hole through which the bolt 9 is inserted, and the positioning of the bolt 9 and the third flow path forming section 3 may be performed by the insertion hole of the third flow path forming section. In this case, the first to third flow path forming sections 1 to 3 are fixed by screwing a nut onto the tip of the bolt 9 that passes through the through hole of the third flow path forming section and protrudes from the third flow path forming section.

[0026] Furthermore, in this embodiment, the piping device 10 is described using the first flow path forming portion 1 having the annular convex portion 7 and the second flow path forming portion 2 having the annular concave portion 8. However, the piping device of the present invention is not limited to this, and any other suitable piping device may be used as long as an axial seal is provided so that the first flow path forming portion and the second flow path forming portion can be centered. Therefore, for example, the first flow path forming portion may be provided with an annular concave portion, the second flow path forming portion may be provided with an annular convex portion, and an axial seal may be disposed between the annular concave portion and the annular convex portion. Furthermore, instead of the metal nut 13, the third flow path forming portion 3 may be formed of a metal or synthetic resin part having a female thread portion 13. In this case, the force applied to the bolt 9 is directly received by the second opposing surface 16 of the metal or synthetic resin third flow path forming portion 3.

[0027] Furthermore, the nut 13 is not limited to being insert-molded. For example, the nut may be made of the same synthetic resin material as the third flow path forming portion, resulting in an integrated component with no distinction between the nut and the third flow path forming portion. In this case, the protrusion may be provided on the surface facing the third flow path forming portion. Furthermore, the number of flow path forming portions may be three or more, for example, four or five. In this case, the positions of the shaft seal and face seal may be changed as appropriate, which also achieves the effect of the present invention of suppressing misalignment of the flow path forming portions and reducing flow path resistance more than conventional methods. When a piping device is configured with four or more flow path forming portions and any of the flow path forming portions is not positioned by the shaft seal, the annular recess, and the annular protrusion, or even by the protrusion and the receiving portion, positioning may be achieved by inserting a bolt as a positioning pin through a through hole.

[0028] a piping device (10) comprising: three or more flow path forming sections (1-3) in which a continuous flow path is formed; a bolt (9) inserted across all of the flow path forming sections (1-3) and connecting all of the flow path forming sections (1-3) in series; an axial seal (5) provided somewhere between adjacent flow path forming sections (1-3) to prevent liquid leakage from the flow path; and a face seal (6) provided at a location between adjacent flow path forming sections (1-3) where there is no axial seal (5) to prevent liquid leakage from the flow path, wherein one of the adjacent flow path forming sections (1-3) in which the axial seal (5) is arranged has an annular protrusion (7), and the other of the adjacent flow path forming sections (1-3) in which the axial seal (5) is arranged has an annular recess (8) into which the annular protrusion (7) is inserted, and the axial seal (5) is received in the annular recess (8) and pressed against the outer periphery of the annular protrusion (7), The adjacent flow path forming portions 1 to 3 in which the face seal 6 is arranged each have opposing surfaces 15, 16 that face each other in a direction along the axial direction of the bolt 9, the face seal 6 is pressed between the opposing surfaces 15, 16, one of the adjacent flow path forming portions 1 to 2 in which the axial seal 5 is arranged has an insertion hole through which the bolt 9 is inserted and positioned, and at least one flow path forming portion 3 of the adjacent flow path forming portions in which the face seal is arranged is positioned with the flow path forming portion 1 that has the insertion hole 11 by the bolt 9.

[0029] According to the piping device 10, adjacent flow passage forming sections 1-2 in which shaft seals 5 are disposed can be centered by the annular convex portion 7, the annular concave portion 8, and the shaft seal 5. Therefore, the clearance between the insertion hole 11 through which the bolt 9 is inserted, formed in adjacent flow passage forming sections 1-3 in which the shaft seal 5 is disposed, and the bolt 9 can be prevented from misaligning. Therefore, the diameter of either the first insertion hole 11 or the second insertion opening 12 can be increased to allow for greater positional variation, improving the productivity of the piping device 10. Furthermore, the bolt 9 can function as a positioning pin using the other of the first insertion hole 11 or the second insertion opening 12, which does not have an increased diameter. This allows the centering of adjacent flow passage forming sections 1-3 in which face seals 6 are disposed. Therefore, according to the piping device 10, misalignment of three or more flow passage forming sections 1-3 can be reduced compared to conventional methods while improving productivity, thereby reducing flow passage resistance.

[0030] In the piping device, one of the adjacent flow path forming portions in which the shaft seals 5 are arranged is a flow path forming portion having an insertion hole through which the bolt 9 is inserted for positioning, which is designated as a reference flow path forming portion. Of the adjacent flow path forming portions in which the face seals 6 are arranged, [1] a flow path forming portion having a female threaded portion formed therein into which the male threaded portion 9b of the bolt 9 is threaded, and [2] a flow path forming portion in which a nut 13 into which the male threaded portion 9b of the bolt 9 is threaded is integrated by insert molding or the like, and these are positioned by threading the bolt 9 into the reference flow path forming portion. This prevents misalignment between the flow path forming portions [1] and [2] and the reference flow path forming portion, thereby reducing flow path resistance.

[0031] Furthermore, in a piping device 10 having three or more flow path forming portions, a shaft seal 5, and a face seal 6, and in which the bolts 9 function as positioning pins, among the adjacent flow path forming portions in which the face seals 6 are arranged, the flow path forming portion [3] having a receiving portion 17 for receiving a nut can be positioned by the receiving portion 17 without being positioned by the reference flow path forming portion and the bolt 9. Therefore, the diameter of the insertion hole through which the bolt 9 of the flow path forming portion [3] is inserted can be increased to allow for greater positional variation. This allows for improved productivity while suppressing flow path resistance.

[0032] In the piping device 10 , the bolt 9 has a step 9 a , and the step 9 a is in contact with the opposing surface 16 .

[0033] With this configuration, the force applied to the bolt 9 can be received by the opposing surface 16 via the step portion 9a, thereby improving the durability of the piping device 10 as a whole.

[0034] In addition, in this embodiment, the first flow path forming section 1 and the third flow path forming section 3 are positioned by bolts 9, but the piping device 10 of this embodiment is not limited to this, and further positions the second flow path forming section 2 and the third flow path forming section 3 using nuts 13.

[0035] a bolt 9 connecting all of the flow path forming portions 1 to 3 in series; an axial seal 5 provided somewhere between adjacent flow path forming portions 1, 2 to prevent liquid leakage from the flow path; and a face seal 6 provided at a location between adjacent flow path forming portions 2, 3 where there is no axial seal 5 to prevent liquid leakage from the flow path, wherein a first flow path forming portion 1 of one of the adjacent flow path forming portions 1, 2 where the axial seal 5 is arranged has an annular protrusion 7, and a second flow path forming portion 2 of the other of the adjacent flow path forming portions 1, 2 where the axial seal 5 is arranged has an annular recess 8 into which the annular protrusion 7 is inserted, and the shaft seal 5 is received in the annular recess 8 and pressed against the outer periphery of the annular protrusion 7, The adjacent flow path forming portions 2, 3 on which the face seal 6 is arranged each have opposing surfaces 15, 16 that face each other in a direction along the axial direction of the bolt 9, the face seal 6 is pressed between the opposing surfaces 15, 16, the bolt 9 has a male thread portion 9b at its tip, one of the flow path forming portions (third flow path forming portion 3) has a nut 13 having a female thread portion 13a that screws onto the male thread portion 9b, the nut 13 is provided on the third flow path forming portion 3 so as to protrude from one of the opposing surfaces 16, the second flow path forming portion 2 having the other opposing surface 15 has a receiving portion 17 that receives the nut 13, and the third flow path forming portion 3 having the nut 13 and the 23rd flow path forming portion 2 having the receiving portion 17 are positioned by the nut 13 and the receiving portion 17 fitting together.

[0036] According to the above configuration, adjacent flow path forming portions 1-3 in which the shaft seal 5 is disposed can be centered by the annular protrusion 7, the annular recess 8, and the shaft seal 5. Furthermore, adjacent flow path forming portions 1-3 in which the face seal 6 is disposed can be centered by the nut 13 and the receiving portion 17. Therefore, according to the piping device 10 of this embodiment, it is possible to reduce misalignment of three or more flow path forming portions 1-3 more than conventionally, thereby reducing flow path resistance. Furthermore, the bolt 9 can also be assembled to the first to third three flow path forming portions 1-3 last.

[0037] In addition, in this embodiment, the piping device 10 has three flow path forming sections, an axial seal 5 is arranged between the first flow path forming section 1 and the second flow path forming section 2, a face seal 6 is arranged between the second flow path forming section 2 and the third flow path forming section 3, the third flow path forming section 3 has a nut 13, and a receiving section 17 is formed in the second flow path forming section 2.

[0038] According to the above configuration, the first flow path forming portion 1 and the second flow path forming portion 2 are aligned by the annular convex portion 7, the annular concave portion 8, and the shaft seal 5, and the second flow path forming portion 2 and the third flow path forming portion 3 are positioned by the nut 13 and the receiving portion 17. Therefore, even without using the bolt 9 as a positioning pin, it is possible to suppress misalignment of the flow path forming portions 1 to 3 and reduce flow path resistance. Note that the number of flow path forming portions may be three or more, and when there are four or more, the bolt 9 may be used as a positioning pin.

[0039] In the piping device 10 , the bolt 9 has a step 9 a located closer to the base end than the male thread portion 9 b , and the step 9 a is in contact with the nut 13 .

[0040] With this configuration, the force applied to the bolt 9 can be received by the nut 13, and the durability of the piping device 10 as a whole can be improved.

[0041] Although the preferred embodiments of the present invention have been described above, appropriate changes and modifications can be made without departing from the scope of the claims.

[0042] REFERENCE SIGNS LIST 1 First flow path forming portion 2 Second flow path forming portion 3 Third flow path forming portion 5 Shaft seal 6 Face seal 7 Annular convex portion 8 Annular concave portion 9 Bolt 9a Step portion 9b Male thread portion 10 Piping device 11 First insertion hole 12 Second insertion hole 13 Nut 13a Female thread portion 13b Protrusion 14 Connection direction 15 First opposing surface 16 Second opposing surface 17 Receiving portion

Claims

1. A piping device comprising: three or more flow path forming portions in which a continuous flow path is formed; a bolt inserted across all of the flow path forming portions and connecting all of the flow path forming portions in series; a shaft seal provided between any adjacent ones of the flow path forming portions to prevent liquid leakage from the flow path; and a face seal provided at a location where there is no shaft seal between adjacent ones of the flow path forming portions to prevent liquid leakage from the flow path, wherein one of the adjacent flow path forming portions where the shaft seal is disposed has an annular convex portion, the other of the adjacent flow path forming portions where the shaft seal is disposed has an annular concave portion into which the annular convex portion is inserted, the shaft seal is housed in the annular concave portion and pressed against the outer periphery of the annular convex portion, the adjacent flow path forming portions where the face seal is disposed each have opposing surfaces facing each other in a direction along the axial direction of the bolt, the face seal is pressed between the opposing surfaces, one of the adjacent flow path forming portions where the shaft seal is disposed has an insertion hole through which the bolt is inserted for positioning, and at least one of the adjacent flow path forming portions where the face seal is disposed is positioned by the bolt with the flow path forming portion having the insertion hole.

2. The piping device according to claim 1, wherein the bolt has a stepped portion, and the stepped portion is in contact with the opposing surface.

3. A piping device comprising: three or more flow path forming portions in which a continuous flow path is formed; a bolt inserted across all of the flow path forming portions and connecting all of the flow path forming portions in series; a shaft seal provided between any adjacent ones of the flow path forming portions to prevent liquid leakage from the flow path; and a surface seal provided at a location where there is no shaft seal between adjacent ones of the flow path forming portions to prevent liquid leakage from the flow path. One of the adjacent flow path forming portions where the shaft seal is disposed has an annular convex portion, and the other of the adjacent flow path forming portions where the shaft seal is disposed has an annular concave portion into which the annular convex portion is inserted. The shaft seal is housed in the annular concave portion and pressed against the outer periphery of the annular convex portion. The adjacent flow path forming portions where the surface seal is disposed each have opposing surfaces facing each other in a direction along the axial direction of the bolt. The surface seal is pressed between the opposing surfaces. The bolt has a male screw portion at its tip. One of the flow path forming portions includes a nut having a female screw portion into which the male screw portion is screwed. The nut is provided on the flow path forming portion so as to protrude from one of the opposing surfaces. The flow path forming portion having the other opposing surface has a receiving portion for receiving the nut. The flow path forming portion having the nut and the flow path forming portion having the receiving portion are positioned by fitting of the nut and the receiving portion.

4. The piping device according to claim 3, wherein the bolt has a stepped portion located on the base end side of the male screw portion, and the stepped portion is in contact with the nut.

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