Piping connection tool and piping connection method using same

Abstract

A pipe connecting tool (11) for connecting two pipes is mainly composed of a cylindrical rubber elastic body (21), connecting parts (22A, 22B) which are respectively embedded in the two pipes are arranged at two ends, and a membrane part (23) is arranged at the central part. A first reinforcing ring (31) is embedded in one connecting part (22A), and a second reinforcing ring (41) is embedded in the other connecting part (22B). The first reinforcing ring (31) has a first cylindrical section (32) and a first flange (33), and the second reinforcing ring (41) has a second cylindrical section (42) and a second flange (43). The first flange (33) receives the force of the clamp in the direction from the other connecting part (22B) to the one connecting part (22A), and the second flange (43) receives the force of the clamp in the direction from the one connecting part (22A) to the other connecting part (22B) on the outer peripheral side of the elastic body (21).

Description

Technical Field

[0001] This invention relates to piping connection tools and piping connection methods using the piping connection tools. Background Technology

[0002] Piping fittings are used in various parts of various mechanical fields, including motor vehicles, general industrial machinery, and construction machinery. For example, in the field of motor vehicles, they are used as connectors for cooling pipes in electric vehicles, or as connectors for turbine units and intercoolers.

[0003] Japanese Patent Application Publication No. 2019-007568 (Patent Document 1) discloses a piping connection structure that is disposed between two piping flow paths (4) and (5), and is connected by a cylindrical member (1) formed from a rubber-like elastic material to absorb the core offset between the two piping flow paths (see paragraphs 0024-0025 of Patent Document 1). The cylindrical member (1) has a shape in which one end (11) inserted into the open end of one piping flow path (4) and the other end (12) inserted into the open end of the other piping flow path (5) are integrally provided with a funnel-shaped corrugated section (see Patent Document 1). Figure 1 , 2 5, 6).

[0004] One end side (11) is fitted into the inner circumferential surface of a piping flow path (4). Moreover, an end-side sealing part (2) is provided on the outer circumferential surface of one end side (11) (see paragraphs 0029-0032 of Patent Document 1). The end-side sealing part (2) is composed of a rigid embedded annular member (21) embedded in one end side (11) and a lip (22) bulging out from the outer circumferential surface of one end side (11).

[0005] The other end (12) is fitted into the outer peripheral surface of another piping flow path (5). Furthermore, a sealing portion (3) is provided on the inner peripheral surface of the other end (12). In Patent Document 1... Figure 5 In the fifth embodiment disclosed herein, the sealing portion (3) at the other end is composed of a rigid embedded annular member (35) embedded in the other end (12) and a lip (36) bulging out on the inner circumferential surface of the other end (12) (see Patent Document 1, No. 0055). Figure 5 ).

[0006] Existing technical documents Patent documents Patent Document 1: Japanese Patent Application Publication No. 2019-007568 Summary of the Invention The technical problem that the invention aims to solve Japanese Patent Application Publication No. 2019-007568 (Patent Document 1) does not mention how to connect the cylindrical member (1) relative to the two piping flow paths (4) and (5). Judging from the structure of the one-end sealing part (2) provided on one end side (11) and the other-end sealing part (3) provided on the other end side (12), in the invention described in Patent Document 1, a mechanical connection using a clamp or similar device is not possible; only a manual connection is conceivable. Therefore, a large bonding force for the two piping flow paths (4) and (5) cannot be expected, thus it is presumed that a high level of sealing performance cannot be achieved. Improvement is desired.

[0007] The objective of this invention is to achieve a high level of sealing relative to the two connected pipes.

[0008] Solutions for solving technical problems The piping connection device of the present invention is disposed between two pipes arranged in series axially and connects the two pipes. The piping connection device includes: a rubber elastomer; a first reinforcing ring having a first cylindrical portion and a first flange with higher rigidity than the elastomer; and a second reinforcing ring having a second cylindrical portion and an outwardly facing second flange with higher rigidity than the elastomer. The elastomer includes connecting portions at both ends that respectively engage with one of the pipes and the other pipe, has a cylindrical shape with a flexible membrane integrally provided between the two connecting portions, and has a sealing portion integrally provided in the connecting portions for sealing the pipes. The first reinforcing ring is embedded in one of the connecting portions engaging with the one pipe, and the second reinforcing ring is embedded in the other connecting portion engaging with the other pipe. The first flange receives a clamping force from the other connecting portion toward the first connecting portion, and the second flange receives a clamping force from the first connecting portion toward the other connecting portion on the outer periphery of the elastomer.

[0009] As a type of piping connection tool, the first flange is an inward flange that receives the axial force of a clamp inserted into the interior of the elastic body from the other connection side.

[0010] As another form of piping connection tool, the first flange is an outward flange that receives the axial force of a clamp inserted into the membrane portion from a direction orthogonal to the axial direction.

[0011] One form of a piping connection method using a piping connection tool includes: preparing the piping connection tool of the above-described form and inserting a first clamp into the interior of the elastomer from one side of the other connection portion, the first clamp having a diameter that overlaps with the first flange in the axial direction; in a state of alignment to make the pipe fit into the connection portion, pressing the first clamp to apply pressure to the first flange, thereby connecting the pipe to the connection portion; removing the first clamp; inserting an arc-shaped second clamp into the membrane portion of the elastomer in a direction orthogonal to the axial direction; in a state of alignment to make the other pipe fit into the other connection portion, applying pressure to the second flange with the second clamp to connect the other pipe to the other connection portion; and removing the second clamp.

[0012] Another form of the piping connection method using a piping connection tool includes: a step of preparing the piping connection tool of the other form described above and inserting the arc-shaped clamp relative to the membrane portion from a direction orthogonal to the axial direction; a step of applying pressure to the first flange with the clamp in a state where the pipe is aligned to fit with the first connection portion, thereby connecting the pipe to the first connection portion; a step of applying pressure to the second flange with the clamp in a state where the other pipe is aligned to fit with the other connection portion, thereby connecting the other pipe to the other connection portion; and a step of removing the clamp.

[0013] Invention Effects High sealing performance can be achieved for two connected pipes. Attached Figure Description

[0014] Figure 1 A longitudinal sectional front view of the piping connection fixture according to the first embodiment is shown.

[0015] Figure 2 This is a longitudinal sectional front view of the piping connection fixtures showing the dimensions of each part.

[0016] Figure 3 (A) to (E) are taken with the piping connection fixtures set as longitudinal sectional views. Figure 3 (F) is a schematic diagram showing the steps of the piping connection method in sequence from the front view.

[0017] Figure 4 (A) to (F) are schematic diagrams showing the steps of the piping connection method in sequence, viewed from below with the piping connection equipment in view.

[0018] Figure 5This is a longitudinal sectional front view showing a modified form of the piping connection appliance according to the first embodiment.

[0019] Figure 6 This is a schematic diagram showing the cross-sectional shape of the piping connection tool of the second embodiment, which is divided into two halves at the shaft portion, together with the connection process to the piping.

[0020] Figure 7 This is a schematic diagram showing a modified form of the piping connection appliance according to the second embodiment.

[0021] Figure 8 This is a schematic diagram showing the cross-sectional shape of the piping connection tool of the third embodiment, which is divided into two halves at the shaft portion, together with the connection process to the piping.

[0022] Figure 9 This is a schematic diagram showing a modified form of the piping connection appliance according to the third embodiment.

[0023] Figure 10 This is a schematic diagram showing the cross-sectional shape of the piping connection tool of the fourth embodiment, which is divided into two halves at the shaft portion, together with the reinforcing member embedded in the membrane portion.

[0024] Figure 11 (A) is a first example showing the embedding location of the reinforcing member, and (B) is a schematic diagram showing the second example.

[0025] Figure 12 (A) is a third example showing the embedding location of the reinforcing member, and (B) is a schematic diagram showing the fourth example.

[0026] Figure 13 (A) is a fifth example showing the embedding location of the reinforcing member, and (B) is a schematic diagram showing the sixth example.

[0027] Figure 14 The shape of the membrane portion of the piping connection device according to the fifth embodiment is shown in (A) as a schematic diagram of the first form, (B) as a schematic diagram of the second form, and (C) as a schematic diagram of the third form. Detailed Implementation

[0028] The implementation method is described with reference to the accompanying drawings. The items described are as follows.

[0029] [First Implementation] 1. Structure of piping connection tools (1) Summary (2) Elastomer (3) Sealing part (4) Reinforcing ring (5) Fitting of piping and piping connection fittings 2. Piping connection method using piping connection tools (1) Insertion process of the first fixture (2) Connection process between a pipe and a connection part (3) Disassembly process of the first fixture (4) Insertion process of the second fixture (5) Connection process between another pipe and another connection part (6) Disassembly procedure of the second clamp 3. Effects (1) Improved sealing performance (2) Flexibility of connection (3) Connection of pipes of the same diameter 4. Deformation Forms [Second Implementation] 1. Structure of piping connection tools 2. Piping connection method using piping connection tools (1) Insertion process of the first fixture (2) Connection process between a pipe and a connection part (3) Disassembly process of the first fixture (4) Insertion process of the second fixture (5) Connection process between another pipe and another connection part (6) Disassembly procedure of the second clamp 3. Effects 4. Deformation Forms [Third Implementation] 1. Structure of piping connection tools 2. Piping connection method using piping connection tools (1) Fixture insertion process (2) Connection process between a pipe and a connection part (3) Connection process between another pipe and another connection part (4) Fixture disassembly process 3. Effects 4. Deformation Forms [Fourth Implementation] 1. Structure of piping connection tools 2. Piping connection method using piping connection tools 3. Effects (1) Improved durability (2) Inhibition of bending (3) Improvement of tensile strength (4) Lightweight (5) Adjustment of eccentricity and following behavior [Fifth Implementation] 1. Structure of piping connection tools 2. Piping connection method using piping connection tools 3. Effects [Variation Example] [First Implementation] according to Figures 1 to 5 The first embodiment will be described.

[0030] 1. Structure of piping connection tools (1) Summary like Figures 1 to 4 As shown, the piping connection device 11 of this embodiment is disposed between two pipes 101 that are arranged in series in the axial direction and connects the two pipes 101.

[0031] For ease of explanation, one of the two pipes 101 will be designated as pipe 101A, and the other pipe 101 will be designated as pipe 101B. Figure 1 In the figure, the axis passing through the center of the piping connection fitting 11 is indicated by the reference numeral X. Figure 3 In the figure, the axis passing through the center of pipe 101A is indicated by reference numeral Y, and the axis passing through the center of pipe 101B is indicated by reference numeral Z.

[0032] In the accompanying drawings, reference numeral A indicates the axial direction, and reference numeral R indicates the radial direction orthogonal to axial direction A. When the two pipes (101A, 101B) and the pipe connection fitting 11 are positioned in the standard position, axes X, Y, and Z are located on the same axis and parallel to axial direction A. However, in reality, the two pipes (101A, 101B) may experience angular changes, both axially along A and radially along R, causing the two axes Y and Z to intersect and offset.

[0033] Alternatively, the Y-axis of pipe 101A and the Z-axis of pipe 101B do not necessarily have to be on the same axis. The Y-axis and the Z-axis can be offset parallel to each other or offset in a cross manner. Such offset of the Y-axis and the Z-axis can also be used as the standard position of the two pipes 101 (101A, 101B).

[0034] This embodiment discloses a piping connection tool 11 that connects two pipes 101 (101A, 101B) while absorbing accidental or predetermined axial misalignment.

[0035] The piping connection fitting 11 is mainly composed of a rubber elastomer 21. The elastomer 21 includes connecting portions 22 at both ends that respectively engage with end E1 of piping 101A and end E2 of piping 101B, and a flexible membrane portion 23 is integrally formed between the two connecting portions 22. For ease of explanation, the connecting portion 22 connected to piping 101A is referred to as connecting portion 22A, and the other connecting portion 22 connected to piping 101B is referred to as connecting portion 22B.

[0036] A first reinforcing ring 31, made of a material with higher rigidity than the elastomer 21, is embedded in the connecting portion 22A. The first reinforcing ring 31 includes a first cylindrical portion 32 and a first flange 33. The first flange 33 is bent at a right angle from the end of the first cylindrical portion 32 on the tip side of the fitting direction that fits into the pipe 101A in the axial direction A toward the radial inward side R.

[0037] In the elastomer 21, the connecting part 22A is fitted into the inner circumferential surface of the pipe 101A, thereby achieving connection with the pipe 101A. A sealing part 24A is integrally provided on the outer circumferential surface of the connecting part 22A.

[0038] A second reinforcing ring 41, made of a material with higher rigidity than the elastomer 21, is embedded in the connecting portion 22B. The second reinforcing ring 41 includes a second cylindrical portion 42 and a second flange 43. The second flange 43 bends at a right angle from the end of the second cylindrical portion 42 that is in the fitting direction rearward in the axial direction A toward fitting the pipe 101 toward the radially outward side R.

[0039] The elastic body 21 causes the connecting part 22B to fit into the inner circumferential surface of the pipe 101B, thereby achieving a connection with the pipe 101B. A sealing part 24B is integrally provided on the outer circumferential surface of the connecting part 22B.

[0040] (2) Elastomer The elastomer 21 is molded from rubber. For example, chloroprene rubber (CR), ethylene propylene rubber (EPDM), acrylic rubber (ACM), etc. can be used as the material of the elastomer 21.

[0041] like Figure 1 As shown, the shape of the elastomer 21 is based on a cylindrical shape, but it is not necessarily a completely cylindrical shape.

[0042] The end of the connecting portion 22A extends radially inward toward the R. A first flange 33 is embedded in this portion.

[0043] A portion of the outer peripheral surface of the elastic body 21 on the side near the connecting part 22B protrudes outward toward the radial R. A second flange 43 is embedded in this portion.

[0044] Therefore, the first flange 33 and the second flange 43 are coated with rubber constituting the elastomer 21.

[0045] The inner circumferential surface of the elastomer 21 maintains a uniform inner diameter d1 throughout the entire region. However, on one side of the connecting portion 22B, there is an inner diameter d2 that is slightly larger than the inner diameter d1, only in the region near the opening. The region with the inner diameter d2 is approximately one-third of the axial length A of the second cylindrical portion 42.

[0046] The outer diameter of the outer peripheral surface of the elastomer 21 is set as outer diameter d3. The two sealing parts 24A and 24B, which are of the same diameter, have an outer diameter d4 that is slightly larger than the outer diameter d3. The portion of the outer peripheral surface of the elastomer 21 into which the second flange 43 is embedded has the outer diameter d5 with the largest diameter.

[0047] In the elastomer 21, the area where the first reinforcing ring 31 is embedded is designated as the connecting portion 22A, the area where the second reinforcing ring 41 is embedded is designated as the connecting portion 22B, and the area between the connecting portion 22A and the connecting portion 22B is designated as the membrane portion 23. The membrane portion 23 is a flexible area made solely of rubber, which absorbs the axial misalignment generated between the connecting portion 22A and the connecting portion 22B.

[0048] (3) Sealing part As described above, the elastomer 21 has a sealing part 24A integrally provided on the outer peripheral surface of the connecting part 22A, and a sealing part 24B integrally provided on the outer peripheral surface of the connecting part 22B.

[0049] like Figure 1 As shown, the sealing portion 24A protrudes annularly from the outer peripheral surface of the connecting portion 22A at a position corresponding to the first cylindrical portion 32. The protrusion amount is (d4-d3) / 2. The sealing portion 24A cooperates with the first reinforcing ring 31 to seal the joint between the pipe 101A and the connecting portion 22A. That is, the sealing portion 24A increases the contact pressure relative to the inner peripheral surface of the pipe 101A, thereby strengthening the sealing effect. At this time, the first cylindrical portion 32 receives the force acting on the sealing portion 24A that wants to escape radially inward.

[0050] The sealing portion 24B protrudes annularly from the outer peripheral surface of the connecting portion 22B at a position corresponding to the second cylindrical portion 42. The protrusion amount is (d4-d3) / 2. The sealing portion 24B cooperates with the second reinforcing ring 41 to seal the joint between the pipe 101B and the connecting portion 22B. That is, the sealing portion 24B increases the contact pressure relative to the inner peripheral surface of the pipe 101B, thereby strengthening the sealing effect. At this time, the second cylindrical portion 42 receives the force acting on the sealing portion 24B that wants to escape radially inward.

[0051] (4) Reinforcing ring The first reinforcing ring 31 and the second reinforcing ring 41 are, for example, ring-shaped components obtained by stamping metal. In addition to metal, any material that has a higher rigidity than the elastomer 21 and can increase the bonding force between the pipes 101 (101A, 101B) and the connecting parts 22 (22A, 22B) can be used, such as synthetic resin.

[0052] like Figure 1 As shown, the first cylindrical portion 32 of the first reinforcing ring 31 and the second cylindrical portion 42 of the second reinforcing ring 41 both have a cylindrical shape with a diameter slightly larger than the inner diameter d2 of the larger diameter of the elastic body 21. The first cylindrical portion 32 and the second cylindrical portion 42 have the same diameter.

[0053] The first flange 33 of the first reinforcing ring 31 is an inward flange with an open shape in the central portion. The diameter of the opening, i.e., the inner diameter d6 of the first flange 33, is smaller than the inner diameter d1 of the elastic body 21, which is the smaller diameter of the elastic body 21. Therefore, when the connecting portion 22A is viewed from the side of the connecting portion 22B, the first flange 33 extends radially inward by a radius R compared to the inner wall of the elastic body 21.

[0054] The second flange 43 of the second reinforcing ring 41 is an outward flange. The outer diameter d7 of the second flange 43 is larger than the outer diameter d4 of the two sealing portions 24A and 24B. Therefore, when the connecting portion 22A is viewed from the side of the connecting portion 22B, the second flange 43 extends radially outward than the two sealing portions 24A and 24B.

[0055] (5) Fitting of piping and piping connection fittings The two connecting parts 22 (22A, 22B) of the elastomer 21 are respectively fitted into the inner circumference of the two pipes 101 (101A, 101B).

[0056] The two pipes 101 (101A, 101B) have the same inner diameter. Therefore, the diameter of the fitting portion of the connector 22A relative to the pipe 101A is the same as the diameter of the fitting portion of the connector 22B relative to the pipe 101B.

[0057] The inner diameter of pipe 101A is the same as or slightly smaller than the outer diameter d3 of elastomer 21. The inner diameter of pipe 101B is also the same as or slightly smaller than the outer diameter d3 of elastomer 21. Therefore, when the two connecting parts 22 (22A, 22B) are engaged with the two pipes 101 (101A, 101B) respectively, the sealing parts 24A and 24B are crushed.

[0058] A stepped portion S1 is provided inside the end E1 of the pipe 101A. The end face ES1 of the connecting portion 22A that fits into the pipe 101A abuts against the stepped portion S1.

[0059] A stepped portion S2 is provided inside the end E2 of the pipe 101B. The end face ES2 of the connecting portion 22B that fits into the pipe 101B abuts against the stepped portion S2.

[0060] 2. Piping connection method using piping connection tools Main use Figure 3 and Figure 4 This describes the method of connecting two pipes 101 (101A, 101B) using the pipe connection tool 11.

[0061] (1) Insertion process of the first fixture like Figure 3 (A) and Figure 4 As shown in (A), prepare the piping connection tool 11 and insert the first clamp 201 into the elastic body 21.

[0062] The first clamp 201 is a cylindrical component with a diameter slightly smaller than the inner diameter d1 of the elastic body 21 and an outer diameter larger than the inner diameter d6 of the first flange 33. That is, the first clamp 201 has a diameter that overlaps with the first flange 33 in the axial direction A.

[0063] In this process, the first clamp 201 is inserted into the interior of the elastic body 21 from one side of the connecting portion 22B. The first clamp 201 abuts against the rubber covering the first flange 33. The first flange 33 receives the force of the first clamp 201 from the connecting portion 22B toward the connecting portion 22A.

[0064] (2) Connection process between a pipe and a connection part like Figure 3 (B) and Figure 4 As shown in (B), the pipe 101A is aligned so that the connection portion 22A of the elastic body 21 is engaged. When the first clamp 201 is pressed in this state to apply pressure to the first flange 33, the first flange 33 receives the force of the first clamp 201 from the connection portion 22B toward the connection portion 22A, pressing the connection portion 22A into the interior of the pipe 101A. When the end face ES1 of the connection portion 22A abuts against the stepped portion S1 of the pipe 101A, the pipe 101A and the connection portion 22A are connected.

[0065] Alternatively, while maintaining the pipe 101A in a position where it is engaged with the connection portion 22A of the elastomer 21, the pipe 101A can be pressed towards the first clamp 201 inserted into the elastomer 21. When the stepped portion S1 of the pipe 101A abuts against the end face ES1 of the connection portion 22A, the pipe 101A and the connection portion 22A are connected.

[0066] Regardless of the method used, at this point, the sealing part 24A is crushed, and the piping 101A and the connection part 22A are sealed.

[0067] (3) Disassembly process of the first fixture like Figure 3 (C) and Figure 4 As shown in (C), if the piping 101A is connected to the connecting part 22A, the first clamp 201 is pulled out and removed from the elastomer 21.

[0068] (4) Insertion process of the second fixture like Figure 3 (D) and Figure 4 As shown in (D), the second clamp 211 is inserted into the elastic body 21.

[0069] The second clamp 211 is a component with an arc-shaped form, similar to a component that is axially cut into a cylindrical shape. The axial thickness of the second clamp 211 is set to be narrower than the gap between the end E1 of the pipe 101A connected to the connecting part 22A and the rubber portion of the elastomer 21 covered by the second flange 43.

[0070] In this process, the second clamp 211 is inserted into the membrane portion 23 of the elastomer 21 from a direction orthogonal to the axial direction A (radial R). The inner wall portion of the second clamp 211, which is arc-shaped, is inserted into the membrane portion 23.

[0071] (5) Connection process between another pipe and another connection part like Figure 3 (E) and Figure 4 As shown in (E), the pipe 101B is aligned so that it engages with the connecting portion 22B. Thus, the second clamp 211 is positioned to overlap with the second flange 43 in the axial direction A. When the second flange 43 is pressed against the second clamp 211 while maintaining this position, the second flange 43 receives the force of the second clamp 211 from the connecting portion 22A toward the connecting portion 22B, thereby pressing the connecting portion 22B into the interior of the pipe 101B. When the end face ES2 of the connecting portion 22B abuts against the stepped portion S2 of the pipe 101B, the pipe 101B and the connecting portion 22B are connected.

[0072] Alternatively, while maintaining the alignment so that the pipe 101B fits into the connector 22B, the pipe 101B can be pressed towards the second clamp 211 mounted on the membrane portion 23. When the stepped portion S2 of the pipe 101B abuts against the end face ES2 of the connector 22B, the pipe 101B and the connector 22B are connected.

[0073] Regardless of the method used, at this point, the sealing part 24B is crushed, and the piping 101B and the connection part 22B are sealed.

[0074] (6) Disassembly procedure of the second clamp like Figure 3 (F) and Figure 4 As shown in (F), if the pipe 101B is connected to the connector 22B, the second clamp 211 is pulled out and removed from the elastomer 21.

[0075] In this way, pipe 101A is connected to connector 22A, pipe 101B is connected to connector 22B, and the two pipes 101 (101A, 101B) are connected by pipe connection fitting 11.

[0076] 3. Effects The piping connection tool 11 and the piping connection method using the piping connection tool 11 in this embodiment are configured as described above, and therefore have various effects as shown below.

[0077] (1) Improved sealing performance According to this embodiment, the connection between pipe 101A and connector 22A is achieved using a first clamp 201, and the connection between pipe 101B and connector 22B is achieved using a second clamp 211. Therefore, the connection between the two pipes 101 (101A, 101B) and the two connectors 22 (22A, 22B) can be achieved by mechanical pressing. This increases the interference fit between the two pipes 101 (101A, 101B) and the two connectors 22 (22A, 22B), allowing for a larger bonding force. As a result, a high level of sealing is achieved relative to the two pipes 101 (101A, 101B) to be connected.

[0078] (2) Flexibility of connection The membrane portion 23 of the elastomer 21 is flexible, thus absorbing axial misalignment between the two pipes 101 (101A, 101B). Therefore, the pipe connection device 11 according to this embodiment can follow static or dynamic eccentricity between the two pipes 101 (101A, 101B).

[0079] (3) Connection of pipes of the same diameter The first flange 33 is subjected to the force of the first clamp 201 from the inner peripheral side of the elastic body 21, and the second flange 43 is subjected to the force of the second clamp 211 from the outer peripheral side of the elastic body 21, so that two pipes 101 (101A, 101B) of the same diameter can be connected.

[0080] 4. Deformation Forms Figure 5 This is a longitudinal sectional front view showing a modified form of the piping connection device 11 according to the first embodiment.

[0081] This form is a variation of the sealing part. In addition to the sealing parts 24A and 24B, the elastomer 21 in this form also has three other sealing parts, namely sealing part 24C1, sealing part 24C2 and sealing part 24D2. Figure 5 In the diagram, the positions of sealing parts 24C1, 24C2 and 24D2 are schematically shown using circular markers.

[0082] The sealing part 24C1 is arranged in a ring shape on the end face ES1 of the connecting part 22A, at a position axially aligned with the first cylindrical part 32 of the first reinforcing ring 31. When the connecting part 22A is fitted with the pipe 101A, the sealing part 24C1 abuts against the stepped part S1 provided in the end E1 of the pipe 101A, thereby sealing the pipe 101A and the connecting part 22A.

[0083] The sealing part 24C2 is arranged in a ring shape on the end face ES2 of the connecting part 22B, at a position axially aligned with the second cylindrical part 42 of the second reinforcing ring 41. When the connecting part 22B is fitted with the pipe 101B, the sealing part 24C2 abuts against the stepped part S2 provided in the end E2 of the pipe 101B, thereby sealing the pipe 101B and the connecting part 22B.

[0084] The sealing portion 24D2 is arranged in a ring shape in the rubber of the elastomer 21 covering the second flange 43, facing the pipe 101B. When the connecting portion 22B is engaged with the pipe 101B, the sealing portion 24D2 abuts against the end E2 of the pipe 101B, thereby sealing the pipe 101B and the connecting portion 22B.

[0085] [Second Implementation] based on Figure 6 and Figure 7 The second embodiment will now be described. Parts identical to those in the first embodiment are indicated by the same reference numerals, and their descriptions are omitted.

[0086] 1. Structure of piping connection tools In this embodiment, the two connecting portions 22 (22A, 22B) of the elastomer 21 are fitted onto the outer periphery of the two pipes 101 (101A, 101B), respectively. Based on this structure, both sealing portions 24A and 24B are provided on the inner peripheral surface of the elastomer 21.

[0087] The first reinforcing ring 31 has a first flange 33 at the end of the first cylindrical portion 32 that is in the fitting direction to fit into the piping 101A.

[0088] 2. Piping connection method using piping connection tools based on Figure 6This describes the method of connecting two pipes 101 (101A, 101B) using the pipe connection tool 11.

[0089] (1) Insertion process of the first fixture Prepare the piping connection tool 11 and insert the first clamp 201 into the elastic body 21.

[0090] The first clamp 201 has a diameter that overlaps with the first flange 33 in the axial direction A. Therefore, the first clamp 201, which is inserted into the interior of the elastomer 21, abuts against the rubber covering the first flange 33. The first flange 33 receives the force of the first clamp 201 in the direction from the connecting portion 22B toward the connecting portion 22A.

[0091] (2) Connection process between a pipe and a connection part This aligns the connection point 22A between the pipe 101A and the elastic body 21. When the first clamp 201 is pressed in and pressure is applied to the first flange 33 in this state, the first flange 33 receives the force from the first clamp 201 in the direction from the connection point 22B toward the connection point 22A, thereby pressing the connection point 22A into the interior of the pipe 101A. When the end face ES1 of the connection point 22A abuts against the stepped portion S1 of the pipe 101A, the pipe 101A and the connection point 22A are connected.

[0092] Alternatively, while maintaining the pipe 101A in alignment such that it engages with the connection portion 22A of the elastomer 21, the pipe 101A can be pressed towards the first clamp 201 inserted into the elastomer 21. In this case, when the stepped portion S1 of the pipe 101A abuts against the end face ES1 of the connection portion 22A, the pipe 101A is connected to the connection portion 22A.

[0093] Regardless of the method used, at this point, the sealing part 24A is crushed, and the piping 101A and the connection part 22A are sealed.

[0094] (3) Disassembly process of the first fixture If the piping 101A is connected to the connecting part 22A, the first clamp 201 is pulled out and removed from the elastic body 21.

[0095] (4) Insertion process of the second fixture Insert the second clamp 211 into the elastic body 21.

[0096] The second clamp 211 is a component with an arc-shaped form, similar to a component cut into a cylindrical shape along the axial direction (see the first embodiment shown). Figure 4 (D) ~ (F)).

[0097] In this process, the second clamp 211 is inserted into the membrane portion 23 of the elastomer 21 from a direction orthogonal to the axial direction A (radial R). The inner wall portion of the second clamp 211, which is arc-shaped, is inserted into the membrane portion 23.

[0098] (5) Connection process between another pipe and another connection part The pipe 101B is aligned so that it engages with the connecting portion 22B. Thus, the second clamp 211 is positioned to overlap with the second flange 43 in the axial direction A. When the second clamp 211 is used to apply pressure to the second flange 43 while maintaining this position, the second flange 43 receives the force from the second clamp 211 in the direction from the connecting portion 22A towards the connecting portion 22B, thereby pressing the connecting portion 22B into the interior of the pipe 101B. When the end face ES2 of the connecting portion 22B abuts against the stepped portion S2 of the pipe 101B, the pipe 101B and the connecting portion 22B are connected.

[0099] Alternatively, while maintaining the alignment so that the pipe 101B fits into the connector 22B, the pipe 101B can be pressed towards the second clamp 211 mounted on the membrane portion 23. When the stepped portion S2 of the pipe 101B abuts against the end face ES2 of the connector 22B, the pipe 101B and the connector 22B are connected.

[0100] Regardless of the method used, at this point, the sealing part 24B is crushed, and the piping 101B and the connection part 22B are sealed.

[0101] (6) Disassembly procedure of the second clamp If the piping 101B is connected to the connecting part 22B, then pull out the second clamp 211 and remove it from the elastomer 21.

[0102] In this way, pipe 101A is connected to connector 22A, pipe 101B is connected to connector 22B, and the two pipes 101 (101A, 101B) are connected by pipe connection fitting 11.

[0103] 3. Effects This embodiment also has the same effects as the first embodiment.

[0104] 4. Deformation Forms Figure 7 This is a longitudinal sectional front view showing a modified form of the piping connection device 11 according to the second embodiment.

[0105] This form is a variation of the sealing part. In addition to the sealing parts 24A and 24B, the elastomer 21 in this form also has three other sealing parts, namely sealing part 24C1, sealing part 24C2 and sealing part 24D1. Figure 7In the diagram, the sealing parts 24C1, 24C2 and 24D1 are schematically shown in their configuration positions using circular markings.

[0106] The sealing part 24C1 is arranged in a ring shape on the end face ES1 of the connecting part 22A, at a position axially aligned with the first cylindrical part 32 of the first reinforcing ring 31. When the connecting part 22A is fitted into the pipe 101A, the sealing part 24C1 abuts against the stepped part S1 provided in the end E1 of the pipe 101A, thereby sealing the pipe 101A and the connecting part 22A.

[0107] The sealing part 24C2 is arranged in a ring shape on the end face ES2 of the connecting part 22B, at a position axially aligned with the second cylindrical part 42 of the second reinforcing ring 41. When the connecting part 22B is fitted with the pipe 101B, the sealing part 24C2 abuts against the stepped part S2 provided in the end E2 of the pipe 101B, thereby sealing the pipe 101B and the connecting part 22B.

[0108] The sealing part 24D1 is arranged in a ring shape in the rubber of the elastomer 21 covering the first flange 33, facing the pipe 101A. When the connecting part 22A is fitted with the pipe 101A, the sealing part 24D1 abuts against the end E1 of the pipe 101A, thereby sealing the pipe 101A and the connecting part 22A.

[0109] [Third Implementation] based on Figure 8 and Figure 9 The third embodiment will now be described. Parts identical to those in the first and second embodiments are shown using the same reference numerals, and their descriptions are omitted.

[0110] 1. Structure of piping connection tools In this embodiment, the two connecting portions 22 (22A, 22B) of the elastomer 21 are fitted with the inner circumferential sides of the two pipes 101 (101A, 101B), which is the same as in the first embodiment, but different from the second embodiment. Based on this structure, sealing portions 24A and 24B are both provided on the outer circumferential surface of the elastomer 21.

[0111] The first reinforcing ring 31 has a first flange 33 at the end of the first cylindrical portion 32, which is located on the rear side of the fitting direction to fit into the pipe 101A. This aspect differs from the first embodiment but is the same as the second embodiment. However, unlike the second embodiment, the first flange 33 is an outward flange. Since the first flange 33 is an outward flange, the first flange 33 and the second flange 43 face each other across the membrane portion 23.

[0112] Other aspects are the same as those in the first and second embodiments.

[0113] 2. Piping connection method using piping connection tools based on Figure 8 This describes the method of connecting two pipes 101 (101A, 101B) using the pipe connection tool 11.

[0114] (1) Fixture insertion process Prepare the piping connection tool 11 and insert the clamp 221 into the elastic body 21.

[0115] The clamp 221 is a component with an arc-shaped form, similar to a component that is axially cut into a cylindrical shape. The axial thickness of the clamp 221 is set to be narrower than the gap between the first flange 33 and the second flange 43 facing each other across the membrane portion 23. The clamp 221 has a diameter that overlaps with the first flange 33 and the second flange 43 in the axial direction A.

[0116] In this process, the clamp 221 is inserted into the membrane portion 23 of the elastomer 21 from a direction orthogonal to the axial direction A (radial R). The inner wall portion of the clamp 221, which is arc-shaped, is inserted into the membrane portion 23.

[0117] (2) Connection process between a pipe and a connection part The pipe 101A is aligned so that the connection portion 22A of the elastic body 21 is engaged. When the clamp 221 is pressed into the pipe 101A in this state to apply pressure to the first flange 33, the first flange 33 receives the force of the clamp 221 from the connection portion 22B toward the connection portion 22A, thereby pressing the connection portion 22A into the interior of the pipe 101A. When the end face ES1 of the connection portion 22A abuts against the stepped portion S1 of the pipe 101A, the pipe 101A and the connection portion 22A are connected.

[0118] Alternatively, while maintaining the pipe 101A in alignment such that it engages with the connection portion 22A of the elastomer 21, the pipe 101A can be pressed against the clamp 221 mounted on the membrane portion 23. In this case, when the stepped portion S1 of the pipe 101A abuts against the end face ES1 of the connection portion 22A, the pipe 101A is connected to the connection portion 22A.

[0119] Regardless of the method used, at this point, the sealing part 24A is crushed, and the piping 101A and the connection part 22A are sealed.

[0120] (3) Connection process between another pipe and another connection part The pipe 101B is aligned so that it engages with the connector 22B. When the clamp 221 is pressed into the pipe 101B and pressure is applied to the second flange 43 in this state, the second flange 43 receives the force from the clamp 221 in the direction from the connector 22A towards the connector 22B, thereby pressing the connector 22B into the interior of the pipe 101B. When the end face ES2 of the connector 22B abuts against the stepped portion S2 of the pipe 101B, the pipe 101B and the connector 22B are connected.

[0121] Alternatively, the pipe 101B can be pressed toward the clamp 221 mounted on the membrane portion 23 while it is aligned in a manner that allows the pipe 101B to engage with the connecting portion 22B. When the stepped portion S2 of the pipe 101B abuts against the end face ES2 of the connecting portion 22B, the pipe 101B and the connecting portion 22B are connected.

[0122] Regardless of the method used, at this point, the sealing part 24B is crushed, and the piping 101B and the connection part 22B are sealed.

[0123] (4) Fixture disassembly process If the piping 101B is connected to the connector 22B, pull out the clamp 221 and remove it from the elastomer 21.

[0124] In this way, pipe 101A is connected to connector 22A, pipe 101B is connected to connector 22B, and the two pipes 101 (101A, 101B) are connected by pipe connection fitting 11.

[0125] 3. Effects According to this embodiment, the clamp 221 is assembled onto the membrane portion 23 of the elastomer 21. This single clamp 221 can support both the connection operation between the pipe 101A and the connecting portion 22A, and the connection operation between the pipe 101B and the connecting portion 22B. Therefore, by using a single clamp 221, the pipe connection method can be performed with fewer steps, thereby improving work efficiency.

[0126] In other respects, this embodiment also has the same effects as the first and second embodiments.

[0127] 4. Deformation Forms Figure 9 This is a longitudinal sectional front view showing a modified form of the piping connection device 11 according to the third embodiment.

[0128] This form is a variation of the sealing part. In addition to the sealing parts 24A and 24B, the elastomer 21 in this form also has four other sealing parts, namely sealing part 24C1, sealing part 24C2, sealing part 24D1 and sealing part 24D2. Figure 9In the diagram, sealing parts 24C1, 24C2, 24D1, and 24D2 are schematically shown with circular markings indicating their configuration positions.

[0129] The sealing part 24C1 is arranged in a ring shape on the end face ES1 of the connecting part 22A, at a position axially aligned with the first cylindrical part 32 of the first reinforcing ring 31. When the connecting part 22A is fitted into the pipe 101A, the sealing part 24C1 abuts against the stepped part S1 provided in the end E1 of the pipe 101A, thereby sealing the pipe 101A and the connecting part 22A.

[0130] The sealing part 24C2 is arranged in a ring shape on the end face ES2 of the connecting part 22B, at a position axially aligned with the second cylindrical part 42 of the second reinforcing ring 41. When the connecting part 22B is fitted into the pipe 101B, the sealing part 24C2 abuts against the stepped part S2 provided in the end E2 of the pipe 101B, thereby sealing the pipe 101B and the connecting part 22B.

[0131] The sealing part 24D1 is arranged in a ring shape in the rubber of the elastomer 21 covering the first flange 33, facing the pipe 101A. When the connecting part 22A is fitted with the pipe 101A, the sealing part 24D1 abuts against the end E1 of the pipe 101A, thereby sealing the pipe 101A and the connecting part 22A.

[0132] The sealing portion 24D2 is arranged in a ring shape in the rubber of the elastomer 21 covering the second flange 43, facing the pipe 101B. When the connecting portion 22B is engaged with the pipe 101B, the sealing portion 24D2 abuts against the end E2 of the pipe 101B, thereby sealing the pipe 101B and the connecting portion 22B.

[0133] [Fourth Implementation] based on Figures 10 to 13 The fourth embodiment will now be described. Parts identical to those in the first to third embodiments are shown using the same reference numerals, and their descriptions are omitted.

[0134] 1. Structure of piping connection tools In this embodiment, the piping connection tool 11 has a reinforcing member 51 embedded in the membrane portion 23 of the elastomer 21. The reinforcing member 51 is a structure that can improve the rigidity of the membrane portion 23, and for example, a helical spring 52 or a base fabric 53 can be used as the reinforcing member 51.

[0135] The helical spring 52 is a structure formed by winding an elastic linear member into a helical shape, which matches the shape of the cylindrical diaphragm 23, allowing it to be easily embedded within the cylindrical shape of the diaphragm 23. The helical spring 52 has axial extension and contraction along the axis A, and elastic deformation occurs both along the axis A and in the radial direction R, thus increasing the rigidity of the diaphragm 23 when embedded within it.

[0136] The base fabric 53 is a fabric product made by winding warp and weft yarns together, and has a structure in which weft yarns are inserted between the interlaced warp yarns. Regarding its properties, due to the flexibility of the base fabric 53, it can be fitted to the cylindrical shape of the membrane portion 23, allowing the base fabric 53 to be embedded within the membrane portion 23. The embedded base fabric 53 suppresses deformation of the membrane portion 23 and increases its rigidity.

[0137] like Figure 11 As shown in (A) and (B), the reinforcing member 51, such as the helical spring 52 and the base fabric 53, can be embedded in the diaphragm portion 23 at a position along the axial direction A, passing through the first cylinder portion 32 and the second cylinder portion 42. The reinforcing member 51 can thus be configured to be in a non-contact state relative to the first cylinder portion 32 and the second cylinder portion 42 (see reference). Figure 11 (A) can also be configured to be in contact with the first cylindrical section 32 and the second cylindrical section 42. Figure 11 (B)

[0138] like Figure 12 As shown in (A) and (B), the reinforcing member 51, such as the helical spring 52 and the base fabric 53, can be embedded in the inner circumference of the first cylindrical portion 32 and the second cylindrical portion 42 along the axial direction A in the diaphragm portion 23. The reinforcing member 51 can be configured to be in a non-contact state relative to the first cylindrical portion 32 and the second cylindrical portion 42 (see reference). Figure 12 (A) can also be configured to be in contact with the first cylindrical section 32 and the second cylindrical section 42. Figure 12 (B)

[0139] Figure 13 The structural examples shown in (A) and (B) are examples of using a base fabric 53 as a reinforcing member 51. The base fabric 53 is embedded in the membrane portion 23 with one end on the outer periphery of the first cylindrical portion 32 and the other end on the inner periphery of the second cylindrical portion 42. The base fabric 53 can be configured to be in a non-contact state relative to the first cylindrical portion 32 and the second cylindrical portion 42 (see reference). Figure 13 (A) can also be configured to be in contact with the first cylindrical section 32 and the second cylindrical section 42. Figure 13 (B)

[0140] Or with Figure 13The states shown in (A) and (B) are opposite. Alternatively, the base fabric 53 can be configured such that one end is on the inner circumference of the first tubular portion 32 and the other end is on the outer circumference of the second tubular portion 42. In this case, the base fabric 53 can be configured to be in a non-contact state relative to the first tubular portion 32 and the second tubular portion 42, or it can be configured to be in contact with the first tubular portion 32 and the second tubular portion 42; either configuration is acceptable.

[0141] 2. Piping connection method using piping connection tools Figures 10 to 13 The diagram shows a structural example in which a reinforcing member 51 is embedded in the membrane portion 23 of the piping connection device 11 in the first embodiment. The object in which the reinforcing member 51 is embedded in the membrane portion 23 is not limited to the first embodiment, but may also be the piping connection device 11 of the second or third embodiment.

[0142] When the reinforcing member 51 is embedded in the membrane portion 23 of the piping connection device 11 of the first embodiment, the connection direction of the two pipes 101 (101A, 101B) using the piping connection device 11 follows... Figure 3 and Figure 4 The piping connection method of the first embodiment is illustrated.

[0143] When the reinforcing member 51 is embedded in the membrane portion 23 of the piping connection device 11 in the second embodiment, the connection direction of the two pipes 101 (101A, 101B) using the piping connection device 11 follows... Figure 6 The piping connection method of the second embodiment is illustrated.

[0144] When the reinforcing member 51 is embedded in the membrane portion 23 of the piping connection device 11 in the third embodiment, the connection direction of the two pipes 101 (101A, 101B) using the piping connection device 11 follows... Figure 8 The piping connection method of the third embodiment is illustrated.

[0145] 3. Effects By embedding the reinforcing member 51, the membrane portion 23 increases rigidity without compromising the eccentricity of following the static or dynamic eccentricity between the two pipes 101 (101A, 101B). As a result, the following effects are achieved.

[0146] (1) Improved durability When fluid flows between two pipes 101 (101A, 101B) connected via the piping connection fitting 11, if the internal pressure increases, a force will be generated that causes the membrane 23 to expand. According to this embodiment, the expansion of the membrane 23 is suppressed by the reinforcing member 51, thereby improving the durability of the membrane 23.

[0147] (2) Inhibition of bending The reinforcing member 51 can also generate a limiting force relative to the buckling of the membrane portion 23. Therefore, during the operation of connecting the connecting portions 22 (22A, 22B) of the piping connection tool 11 to the piping 101 (101A, 101B) respectively, even if an unreasonable force that would cause buckling is applied to the membrane portion 23, the membrane portion 23 can be protected from buckling.

[0148] (3) Improvement of tensile strength The reinforcing member 51 also increases the tensile strength of the membrane portion 23. For example, for maintenance purposes, when it is necessary to disconnect the connection portion 22 (22A, 22B) of the piping connection tool 11 from the piping 101 (101A, 101B), the membrane portion 23 can be protected from damage even if an unreasonable tensile force that would cause damage is applied to the membrane portion 23.

[0149] (4) Lightweight As a result of providing the reinforcing member 51, even if the membrane portion 23 is thinned, the aforementioned improvements in durability, suppression of buckling, and tensile strength can still be ensured. Therefore, the amount of rubber in the local area of ​​the membrane portion 23 can be reduced, and the elastomer 21 can be made lighter.

[0150] (5) Adjustment of eccentricity and following behavior When using a helical spring 52 as a reinforcing member 51, the eccentricity of the diaphragm 23 can be adjusted by the spring strength.

[0151] The base fabric 53 can vary its elasticity depending on the size of the mesh, the material of the warp and weft yarns, and other factors, which vary depending on the winding method of the warp and weft yarns. When the base fabric 53 is used as a reinforcing member 51, the eccentricity of the membrane section 23 can be adjusted by the elasticity of the base fabric 53.

[0152] [Fifth Implementation] based on Figure 14 The fifth embodiment will be described using (A) to (C). Parts identical to those in the first to third embodiments are shown using the same reference numerals and their descriptions are omitted.

[0153] 1. Structure of piping connection tools The membrane portion 23 in the first to fourth embodiments has a straight shape along the axial direction A. In contrast, the membrane portion 23 in this embodiment has a curved shape when viewed in cross-section. Three forms of the curved membrane portion 23 are described.

[0154] Figure 14 (A) is a schematic diagram showing an elastomer 21 having a membrane portion 23 in a first configuration. The membrane portion 23 has a shape in which the central portion is tapered into a curve and the central portion is smaller than the two end portions.

[0155] Figure 14 (B) is a schematic diagram showing an elastomer 21 having a membrane portion 23 in a second form. The membrane portion 23 has a barrel shape with a curved expansion in the central part, and has a shape in which the diameter of the central part is larger than that of the two end parts.

[0156] Figure 14 (C) is a schematic diagram showing an elastomer 21 having a membrane portion 23 in a third form. The membrane portion 23 has a corrugated shape that stretches and contracts along the axial direction.

[0157] 2. Piping connection method using piping connection tools The membrane portion 23 of the first to third forms described above can also be applied to any of the piping connection devices 11 in the first to third embodiments.

[0158] In Figure 14 When any of the membrane portions 23 of the first to third forms shown in (A) to (C) are applied to the membrane portion 23 of the piping connection device 11 of the first embodiment, the connection direction of the two pipes 101 (101A, 101B) using the piping connection device 11 follows Figure 3 and Figure 4 The piping connection method of the first embodiment is illustrated.

[0159] In Figure 14 When any of the membrane portions 23 of the first to third forms shown in (A) to (C) are applied to the membrane portion 23 of the piping connection device 11 of the second embodiment, the connection direction of the two pipes 101 (101A, 101B) using the piping connection device 11 follows Figure 6 The piping connection method of the second embodiment is illustrated.

[0160] In Figure 14 When any of the membrane portions 23 of the first to third forms shown in (A) to (C) are applied to the membrane portion 23 of the piping connection device 11 of the third embodiment, the connection direction of the two pipes 101 (101A, 101B) using the piping connection device 11 follows Figure 8 The piping connection method of the third embodiment is illustrated.

[0161] 3. Effects The membrane portion 23 in the first to third forms all have a curved shape when viewed in cross-section, and therefore is prone to bending in both the axial direction A and the radial direction R. Therefore, it is possible to improve the eccentricity of the two pipes 101 (101A, 101B) connected by the pipe connection device 11 in both the axial direction A and the radial direction R.

[0162] [Variation Example] Each implementation method has been described. However, the implementation is not limited to these various implementation methods; all modifications and variations are possible.

[0163] Explanation of reference numerals in the attached figures 11 Piping connection tools 21 Elastomers 22 Connecting parts 22A Connecting part (one connecting part) 22B Connecting part (another connecting part) 23 Membrane section 24A Sealing section 24B Sealing part 24C1 Sealing Part 24C2 Sealing Part 24D1 Sealing section 24D2 Sealing Part 31 First reinforcing ring 32 First tube section 33 First flange 41 Second reinforcing ring 42 Second tube section 43 Second flange 51 Reinforcing Components 52. Coil Spring 53 base cloth 101 Piping 101A piping (one piping) 101B piping (another piping) 201 First Fixture 211 Second clamp 221 Fixture Inner diameters d1, d2, d6 Outer diameters d3~d5, d7 Axial E1 end E2 end ES1 end face ES2 end face R radial S1 Step Section S2 Step Section X is the axis passing through the center of the piping connection. The Y-axis passes through the center of a pipe. Z passes through the central axis of another pipe

Claims

1. A piping connection tool, disposed between two pipes arranged in series in an axial direction and connecting the two pipes, wherein, The piping connection tools include: A rubber elastomer includes connecting portions at both ends that are respectively fitted into one of the pipes and another pipe, has a cylindrical shape with a flexible membrane integrally provided between the two connecting portions, and has a sealing portion integrally provided in the connecting portions to seal the pipes; A first reinforcing ring is embedded in a connecting portion that fits into the pipe, and has a first cylindrical portion and a first flange with higher rigidity than the elastomer; and The second reinforcing ring is embedded in another connecting portion that engages with the other pipe, and has a second cylindrical portion with higher rigidity than the elastomer and an outward-facing second flange. The first flange receives the force of the clamp from the other connecting portion toward the first connecting portion. The second flange receives the force of the clamp from the direction of the first connection portion toward the other connection portion by the outer peripheral side of the elastic body.

2. The piping connection tool according to claim 1, wherein, The first flange is an inward flange that receives the axial force of a clamp inserted into the interior of the elastomer from one side of the other connection.

3. The piping connection tool according to claim 2, wherein, The first flange is located at the end of the first cylindrical portion on the tip side of the fitting direction, which is to fit into the pipe. The connecting portion includes a sealing portion on its outer peripheral surface that seals the inner peripheral surface of the pipe that is fitted with the outer peripheral side of the connecting portion.

4. The piping connection tool according to claim 2, wherein, The first flange is located at the end of the first cylindrical portion on the rearward side of the fitting direction, which is used to fit into the pipe. The connecting portion includes a sealing portion on its inner circumferential surface that seals the outer circumferential surface of the pipe that is fitted with the inner circumferential side of the connecting portion.

5. The piping connection tool according to claim 2, wherein, The sealing part is configured in: Any one or both of the following: a position on the end face of one connecting part that is axially aligned with the first cylindrical part, and a position on the end face of the other connecting part that is axially aligned with the second cylindrical part.

6. The piping connection tool according to claim 2, wherein, The sealing part is configured in: The portion of the rubber covering the first flange that faces the first conduit and the portion of the rubber covering the second flange that faces the other conduit, or both.

7. The piping connection tool according to claim 2, wherein, The diameter of the fitting portion of one connection relative to the fitting portion of the one pipe is the same as the diameter of the fitting portion of the other connection relative to the fitting portion of the other pipe.

8. The piping connection tool according to claim 1, wherein, The first flange is an outward flange that receives the axial force of the clamp inserted into the membrane portion from a direction orthogonal to the axial direction.

9. The piping connection tool according to claim 8, wherein, The first flange is located at the end of the first cylindrical portion on the rearward side of the fitting direction, which is used to fit into the pipe. The connecting portion includes a sealing portion on its outer peripheral surface that seals the inner peripheral surface of the pipe that is fitted with the outer peripheral side of the connecting portion.

10. The piping connection tool according to claim 8, wherein, The sealing part is configured in: Any one or both of the following: a position on the end face of one connecting part that is axially aligned with the first cylindrical part, and a position on the end face of the other connecting part that is axially aligned with the second cylindrical part.

11. The piping connection tool according to claim 8, wherein, The sealing part is configured in: The portion of the rubber covering the first flange that faces the first conduit and the portion of the rubber covering the second flange that faces the other conduit, or both.

12. The piping connection tool according to claim 8, wherein, The diameter of the fitting portion of one connection relative to the fitting portion of the one pipe is the same as the diameter of the fitting portion of the other connection relative to the fitting portion of the other pipe.

13. The piping connection tool according to claim 1, wherein, A reinforcing member is embedded in the membrane portion.

14. The piping connection tool according to claim 13, wherein, The reinforcing member is a helical spring that extends and contracts axially.

15. The piping connection tool according to claim 13, wherein, The reinforcing member is a base fabric with a cylindrical shape.

16. The piping connection tool according to claim 1, wherein, The membrane portion has a shape in which the diameter of the central portion is smaller than that of the two end portions.

17. The piping connection tool according to claim 1, wherein, The membrane portion has a shape in which the diameter of the central portion is larger than that of the two end portions.

18. The piping connection tool according to claim 1, wherein, The membrane portion has a corrugated shape that expands and contracts along the axial direction.

19. A piping connection method using piping connection tools, wherein, include: A process of preparing a piping connection tool according to any one of claims 2 to 7 and inserting a first clamp into the interior of the elastic body from one side of the other connection portion, wherein the first clamp has a diameter that overlaps with the first flange in the axial direction; In a state where the pipe is aligned to fit with the connecting part, the first clamp is pressed in to apply pressure to the first flange, thereby connecting the pipe to the connecting part. The process of disassembling the first clamp; The process of inserting an arc-shaped second clamp relative to the membrane portion of the elastomer from a direction orthogonal to the axial direction; In a state where the other pipe is aligned to engage with the other connection part, the second flange is pressed using the second clamp to connect the other pipe to the other connection part; and The process of disassembling the second clamp.

20. A piping connection method using piping connection tools, wherein, include: The process of preparing the piping connection tool according to any one of claims 8 to 12 and inserting the arc-shaped clamp relative to the membrane portion from a direction orthogonal to the axial direction; In a state where the pipe is aligned in such a way that it fits into the connection part, the clamp is used to press the first flange, thereby connecting the pipe to the connection part. The process of connecting the other pipe to the other connection part by applying pressure to the second flange with the clamp while the pipe is aligned in a manner that allows it to engage with the other connection part; and The process of disassembling the fixture.

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