Rotation prevention member for pipe joint, and pipe joint unit

Abstract

The invention provides a rotation preventing member for a pipe joint and a pipe joint unit, which are small and convenient to disassemble and assemble relative to the pipe joint. The rotation preventing component (10) comprises a first embedding part (11) which can be embedded with the adapter (20), a second embedding part (12) which is connected with the first embedding part (11) and is embedded with the main body (30), and a limiting part which is arranged on the second embedding part (12) and is used for limiting the relative movement of the main body (30) and the second embedding part (12) in the axial direction of the main body (30), and the limiting part is a convex part (13) hung on the other joint. The second fitting part (12) has a through-hole (12c) located at a position away from the convex part (13) in the radial direction of the main body (30).

Description

Technical Field

[0001] The present invention relates to a rotation preventing component for a pipe joint and a pipe joint unit. Background Art

[0002] A female and male connector for easily connecting a pair of pipes with a single-touch operation is known. Such female and male connectors can rotate while connected, which can cause one pipe to unexpectedly rotate relative to the other. To prevent this rotation, a pipe joint anti-rotation component (hereinafter referred to as a "rotation anti-rotation component") has been proposed (Patent Document 1). This component prevents the rotation of the connected female and male connectors.

[0003] The rotation prevention component disclosed in Patent Document 1 includes a first engaging portion (first annular region) that can engage with the outer periphery of the male connector and a second engaging portion (second annular region) that can engage with the outer periphery of the female connector. By engaging the first engaging portion with the male connector and the second engaging portion with the female connector, the rotation prevention component prevents rotation of the female connector and the male connector. The second engaging portion includes an arm extending from the first engaging portion in the axial direction of the female connector and a protrusion provided at the front end of the arm and protruding radially inward of the female connector. When the protrusion of the rotation prevention component is engaged with a groove formed on the outer periphery of the female connector, axial movement of the female connector and the rotation prevention component is restricted, preventing the rotation prevention component from falling off the female connector. When the arm elastically deforms and the protrusion is released from the groove of the female connector, relative axial movement of the female connector and the rotation prevention component becomes possible, allowing the rotation prevention component to be removed from the female connector. Prior art literature Patent Literature

[0004] Patent Document 1: U.S. Patent No. 7,338,094 Summary of the Invention Problems to be solved by the invention

[0005] As pipe joints become increasingly compact, there is a need to miniaturize the anti-rotation component. One approach to miniaturizing the anti-rotation component disclosed in Patent Document 1 is to shorten the arm portion extending from the first engaging portion. However, shortening the arm portion makes it difficult to deform, making attachment and removal of the anti-rotation component difficult.

[0006] An object of the present invention is to provide a pipe joint anti-rotation member and a pipe joint unit that are compact and easy to attach to or detach from a joint. Means for solving problems

[0007] The present invention relates to a rotation preventing component for a pipe joint for preventing a pair of joints connected to each other from rotating relative to each other, wherein the component comprises a first fitting portion, a second fitting portion and a limiting portion, the first fitting portion being formed to be able to fit into one of the pair of joints; the second fitting portion being connected to the first fitting portion, and fitting into the other joint when the one joint fitted with the first fitting portion is connected to the other joint of the pair of joints; the limiting portion being arranged on the second fitting portion, and limiting the relative movement of the other joint and the second fitting portion in the axial direction of the other joint when the other joint is fitted with the second fitting portion, the limiting portion being a convex portion or a concave portion hung on the other joint, and the second fitting portion having a through hole, which is located at a position radially away from the convex portion or the concave portion of the other joint.

[0008] In addition, according to the present invention, the pipe joint unit includes: a pair of joints connected to each other; and a pipe joint rotation preventing component that prevents relative rotation of the pair of joints, the pipe joint rotation preventing component including: a first fitting portion that is fitted with one of the pair of joints; a second fitting portion that is connected to the first fitting portion and is fitted with the other joint of the pair of joints; and a limiting portion that is provided on the second fitting portion and limits the relative movement of the other joint and the second fitting portion in the axial direction of the other joint, the limiting portion being a convex portion or a concave portion that is hooked on the other joint, and the second fitting portion having a through hole that is located at a position radially away from the convex portion or the concave portion of the other joint. Effects of the Invention

[0009] According to the present invention, the second fitting portion includes a through-hole located radially away from the convex portion or concave portion of the other fitting. Therefore, the intermediate portion between the through-hole and the convex portion or concave portion in the second fitting portion is more easily deformed than in a case where no through-hole is provided. This facilitates radial displacement of the convex portion or concave portion toward the other fitting without causing the second fitting portion to extend axially, thereby removing the restriction on relative movement between the other fitting and the rotation preventing component. This provides a compact, easily removable, and easily attachable to the fitting and a pipe fitting unit for the pipe fitting. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a half longitudinal sectional view of the pipe joint unit having the anti-rotation member according to the first embodiment, showing a state before the adapter (Adaputa) and the body (Body) are connected. Figure 2 It is a half longitudinal sectional view showing the state after the adapter and the main body are connected. Figure 3A This indicates the movement of the elastic ring component. Figure 2 The enlarged cross-sectional view of section A shows a state in which the upper outer peripheral corner of the elastic ring member contacts the second tapered surface of the first locking groove. Figure 3B This indicates the movement of the elastic ring component. Figure 2 The enlarged cross-sectional view of part A shows the state where the elastic ring component is tilted. Figure 3C This indicates the movement of the elastic ring component. Figure 2 The enlarged cross-sectional view of part A shows a state in which the upper outer peripheral corner of the elastic ring member contacts the first tapered surface of the first locking groove. Figure 3D It indicates the movement of the elastic ring component. Figure 2 The enlarged cross-sectional view of part A shows a state in which a tapered surface is formed on the outer periphery of the upper end of the elastic ring member. Figure 4 It is along Figure 2 A cross-sectional view along line BB is shown. Figure 5 It is along Figure 2 Cross-sectional view along line CC shown. Figure 6 It is along Figure 2 A cross-sectional view taken along line DD is shown. Figure 7 It is a semi-longitudinal sectional view showing the state in which the rotation preventing member is moved to the upper direction of the figure to the limit, corresponding to Figure 2 To express. Figure 8 is Figure 7 The diagram shows the rotation preventing member viewed in the direction of arrow E. Figure 9 It is a half longitudinal sectional view of a pipe joint unit having a rotation preventing member according to a second embodiment, showing a state after the adapter and the main body are connected. Figure 10 It is along Figure 9 A cross-sectional view taken along line FF is shown. Figure 11 It is a half longitudinal sectional view of a pipe joint unit having a rotation preventing member according to a third embodiment, showing a state before the adapter and the main body are connected. Figure 12 is a cross-sectional view of a main portion of a pipe joint unit having a rotation preventing member according to a fourth embodiment, corresponding to Figure 5 To express. Figure 13 is a cross-sectional view of a main portion of a pipe joint unit having a rotation preventing member according to a fourth embodiment, corresponding to Figure 6 To express. Figure 14It is a half longitudinal sectional view of a pipe joint unit having a rotation preventing member according to a fifth embodiment, showing a state before the adapter and the main body are connected. Figure 15 is a sectional view of a main portion of a pipe joint unit having a rotation preventing member according to a fifth embodiment, corresponding to Figure 6 To express. Figure 16 is a cross-sectional view of a main portion of a pipe joint unit having a rotation preventing member according to a fifth embodiment when pressurized by air, corresponding to FIG. Figure 6 To express. Figure 17 It is a half longitudinal sectional view of a pipe joint unit having a rotation preventing member according to a sixth embodiment, showing a state before the adapter and the main body are connected. Figure 18 is a sectional view of a main portion of a pipe joint unit having a rotation preventing member according to a sixth embodiment, corresponding to Figure 6 To express. Figure 19 is a cross-sectional view of a main portion of a pipe joint unit having a rotation preventing member according to a sixth embodiment when pressurized by air, corresponding to Figure 6 To express. Figure 20 It is a half longitudinal sectional view of a pipe joint unit having a rotation preventing member according to a seventh embodiment, showing a state before the adapter and the main body are connected. Figure 21 is a sectional view of a main portion of a pipe joint unit having a rotation preventing member according to a seventh embodiment, corresponding to Figure 18 To express. Figure 22 It is a cross-sectional view of the main parts immediately before the anti-rotation member is fitted into the pipe joint unit from the upper side in the seventh embodiment. DETAILED DESCRIPTION

[0011] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The embodiments shown below are merely examples of the present invention and the present invention is not limited thereto. In the following description of each embodiment, the same reference numerals are given to the same structures and the description is omitted as appropriate.

[0012] <First embodiment> Figure 1 FIG is a half longitudinal sectional view of the pipe joint unit 100 having the rotation preventing member 10 according to the present embodiment. Figure 1As shown, the pipe joint unit 100 of this embodiment includes an adapter 20 made of metal as a female component and a main body 30 made of resin as a male component. The adapter 20 and the main body 30 are connected to each other for use. The adapter 20 and the main body 30 are also called pipe joints. Figure 1 , the state before the adapter 20 and the main body 30 are connected is shown. Figure 1 The status shown is Figure 1 The adapter 20 is moved downward and inserted into the adapter 20, thereby connecting the adapter 20 and the main body 30. Figure 1 The direction below is also called the "connection direction".

[0013] The pipe joint unit 100 can be used, for example, for air piping, such as air brake piping, for vehicles like trucks. The adapter 20 connects to a device such as a bellows, while the main body 30 connects to a pipe component such as a tube. By first attaching the adapter 20 to the device using a tool such as a torque driver, multiple main bodies 30 can be mounted without interfering with each other, even in narrow spacing.

[0014] In this embodiment, the adapter 20 is made of a lead-containing copper-zinc alloy (C3604), and the main body 30 is made of polyamide (PA12) reinforced with glass fiber (GF). These materials are only examples, and the present invention is not limited thereto. As materials constituting the adapter 20, brass materials, lead-free materials such as C6801, aluminum alloys, steel materials, and stainless steel materials can be used. The adapter 20 can be made of resin. As materials constituting the main body 30, resin materials such as polyamide 66 (PA66), polyamide 12 (PA12), polyacetal (POM), and polybutylene terephthalate (PBT) can be used, and metal materials such as brass forgings (C3771), lead-free brass materials, aluminum alloys, and stainless steel alloys can also be used.

[0015] The adapter 20 is a cylindrical component with a circular hole 20a extending through the center of the shaft. A flow path 21 is formed through the circular hole 20a. Figure 1 A nut portion 22 is formed at the upper portion of the adapter. A threaded portion 23 is formed on the outer periphery below the nut portion 22. An O-ring (not shown) is interposed between the nut portion 22 and the threaded portion 23. The adapter 20 can be mounted on the device by rotating the nut portion 22 using a tool (not shown), such as a wrench or pliers (not shown), and screwing the threaded portion 23 into a threaded hole in the device (not shown). Figure 1 The shape of the threaded portion 23 shown is only an example, and the present invention is not limited thereto. For example, the shape of the threaded portion 23 can be a tapered thread, a straight thread, a sealing material, a metal seal, etc. In addition, the threaded portion 23 can also be an internal thread.

[0016] A first retaining groove 24 is formed on the inner circumference of the circular hole 20a of the adapter 20. The first retaining groove 24 is formed along the entire circumference of the circular hole 20a of the adapter 20. The first retaining groove 24 includes a first tapered surface 24a, a first parallel surface 24b, a second tapered surface 24c, a second parallel surface 24d, and an orthogonal surface 24e. The first tapered surface 24a, the first parallel surface 24b, the second tapered surface 24c, the second parallel surface 24d, and the orthogonal surface 24e are arranged in this order in the connection direction. The first tapered surface 24a is inclined relative to the axis of the adapter 20 so that the diameter increases as the adapter 20 moves in the connection direction. The first parallel surface 24b is approximately parallel to the axis of the adapter 20. The second tapered surface 24c is inclined relative to the axis of the adapter 20 so that the diameter increases as the adapter 20 moves in the connection direction. The second parallel surface 24d is approximately parallel to the axis of the adapter 20. The orthogonal surface 24e is approximately orthogonal to the axis of the adapter 20. That is, a first conical surface 24a and a second conical surface 24c are formed on the circular hole 20a of the adapter 20, and the two sections of the first conical surface 24a and the second conical surface 24c expand in diameter as they move forward in the connection direction. The first parallel surface 24b connects the first conical surface 24a and the second conical surface 24c, and the second parallel surface 24d connects the second conical surface 24c and the orthogonal surface 24e.

[0017] The elastic ring component 25 is engaged and retained in the first retaining groove 24. The elastic ring component 25 is, for example, a C-shaped ring whose outer periphery is partially cut away and can expand and contract in diameter. The elastic ring component 25 can be made of resin (for example, polyamide 12 (PA12) reinforced with glass fiber (GF) of the same material as the main body 30), or can be made of metal. The longitudinal section of the elastic ring component 25 is, for example, rectangular. When the main body 30 is not connected to the adapter 20, the elastic ring component 25 is in an initial state (no-load state). In the initial state (no-load state), the inner circumferential surface of the elastic ring component 25 protrudes beyond the inner circumferential surface of the circular hole 20a of the adapter 20, and a gap is formed between the outer circumferential surface of the elastic ring component 25 and the second parallel surface 24d of the first retaining groove 24.

[0018] An annular groove 26 is formed on the inner circumference of the circular hole 20a of the adapter 20. A sealing member 27 is fitted into the annular groove 26. The sealing member 27 is, for example, an O-ring. Examples of materials for the sealing member 27 include ethylene propylene diene monomer (EPDM), nitrile rubber (NBR), and hydrogenated nitrile rubber (HNBR).

[0019] In the first locking groove 24 Figure 1 A sealing member 28 is provided above the middle portion to prevent the inflow of garbage. The sealing member 28 is, for example, an O-ring. As a material constituting the sealing member 28, for example, ethylene propylene diene monomer (EPDM), nitrile rubber (NBR), and hydrogenated nitrile rubber (HNBR) can be used.

[0020] The main body 30 is a cylindrical member bent into a horizontal L-shape. It comprises a vertical portion 30A extending in the connecting direction and a horizontal portion 30B extending horizontally and integrally from the upper end of the vertical portion 30A, bent at a right angle. A flow path 36 is provided through the main body 30, formed into a horizontal L-shape by circular holes 30a and 30b of different diameters. While the main body 30 is constructed from a member bent into a horizontal L-shape in this embodiment, it may alternatively be constructed from an F-shaped, T-shaped, or Y-shaped member.

[0021] A sealing ring 31, a buckle 32, a locking ring 33, a cover 34, and a release ring 35 are provided at the open end of the horizontal portion 30B. The tube 1 is retained on the main body 30 via the sealing ring 31, the buckle 32, the locking ring 33, the cover 34, and the release ring 35. The flow path 36 is continuous with the interior space of the tube 1, allowing fluid to flow between the flow path 36 and the interior space of the tube 1.

[0022] A flange portion 30C is integrally formed at a mid-height position on the outer periphery of the vertical portion 30A of the main body 30. The portion closer to the connection direction than the flange portion 30C constitutes an insertion portion 30A1, which is inserted into the circular hole 20a of the adapter 20. A tapered surface 30c is formed on the outer periphery of the lower end of the insertion portion 30A1, which tapers in diameter toward the connection direction. A second retaining groove 37 is formed along the entire circumference of the outer periphery of the insertion portion 30A1.

[0023] The second retaining groove 37 includes a tapered surface 37a, a parallel surface 37b, and an orthogonal surface 37c. The tapered surface 37a, the parallel surface 37b, and the orthogonal surface 37c are arranged in this order in the connection direction. The tapered surface 37a is inclined relative to the axis of the vertical portion 30A in a manner that decreases in diameter as it moves toward the connection direction. The parallel surface 37b is approximately parallel to the axis of the vertical portion 30A. The orthogonal surface 37c is approximately orthogonal to the axis of the vertical portion 30A. In other words, a tapered surface 37a that decreases in diameter as it moves toward the connection direction is formed on the insertion portion 30A1, and the parallel surface 37b connects the tapered surface 37a and the orthogonal surface 37c.

[0024] Figure 2 It is a half longitudinal sectional view showing the state after the adapter 20 and the main body 30 are connected. Figure 1 In the illustrated state, the main body 30 is inserted into the adapter 20 in the coupling direction, thereby coupling the adapter 20 and the main body 30 .

[0025] When the insertion portion 30A1 of the main body 30 is inserted into the circular hole 20a of the adapter 20, the tapered surface 30c of the insertion portion 30A1 contacts the upper inner peripheral edge of the elastic ring member 25, which is retained within the first retaining groove 24 of the adapter 20. The elastic ring member 25 is pushed radially outward from the adapter 20 via the insertion portion 30A1, thereby expanding its diameter. This allows the elastic ring member 25 to be embedded within the first retaining groove 24, allowing the main body 30 to pass (be pressed in).

[0026] like Figure 2 As shown, when the second retaining groove 37 of the main body 30 is aligned with the first retaining groove 24 of the adapter 20, the force that expands the elastic ring member 25 is released. Due to its own elastic restoring force, the elastic ring member 25 contracts in diameter and returns to its initial state, becoming fixed to the second retaining groove 37 of the main body 30. Specifically, when the main body 30 is inserted into the adapter 20 until the second retaining groove 37 of the main body 30 is aligned with the first retaining groove 24 of the adapter 20, the elastic ring member 25 is positioned so as to straddle the second retaining groove 37 of the main body 30 and the first retaining groove 24 of the adapter 20.

[0027] Thus, in this embodiment, the main body 30 and the adapter 20 can be connected via the elastic ring member 25 by simply inserting the main body 30 into the adapter 20. Therefore, for example, in the limited space inside the hood of a truck, the main body 30 can be mounted on the adapter 20 with good operability while preventing interference between the multiple main bodies 30.

[0028] The following is based on Figures 3A to 3D Next, the operation of the elastic ring member 25 when fluid pressure acts on the adapter 20 and the main body 30 connected to each other will be described. Figures 3A to 3D This shows the movement of the elastic ring member 25. Figure 2 An enlarged sectional view of part A.

[0029] When the fluid pressure does not act on the adapter 20 and the main body 30, the elastic ring member 25 is in the Figure 2 When fluid pressure acts on the adapter 20 and the main body 30, that is, when, for example, high-pressure air flows through the flow path 36 of the main body 30, the main body 30 is pulled out of the adapter 20 ( Figure 2 , also called the "connection release direction"). Figure 3A As shown, the main body 30 moves in the disconnection direction until the upper outer peripheral corner P of the elastic ring member 25 contacts the second tapered surface 24 c of the first locking groove 24 . Figure 3A The state where the upper outer peripheral corner portion P of the elastic ring member 25 is in contact with the second tapered surface 24 c of the first locking groove 24 is shown.

[0030] When the upper peripheral corner P of the elastic ring member 25 contacts the second tapered surface 24c of the first locking groove 24, a force F1 acts on the elastic ring member 25 from the second tapered surface 24c. The force F1 is a force in a direction perpendicular to the second tapered surface 24c.

[0031] Furthermore, the bottom surface 25a of the elastic ring member 25 is in surface contact with the orthogonal surface 37c of the second retaining groove 37 of the main body 30. Therefore, a resistance force N acts on the elastic ring member 25. The resistance force N is a force perpendicular to the orthogonal surface 37c. At this time, a friction force FF acts on the bottom surface 25a of the elastic ring member 25. The magnitude of the friction force FF is the value obtained by multiplying the coefficient of friction between the bottom surface 25a of the elastic ring member 25 and the orthogonal surface 37c of the second retaining groove 37 by the magnitude of the resistance force N.

[0032] Friction force F F The horizontal component of force F1 11 , are of the same magnitude and interact in opposite directions. Therefore, the elastic ring member 25 is acted upon by a couple M. As a result, Figure 3B As shown, the elastic ring member 25 is inclined. Figure 3B The figure shows the tilted state of the elastic ring member 25. When the elastic ring member 25 tilts, the upper outer peripheral corner P of the elastic ring member 25 is displaced radially inward of the adapter 20 beyond the first parallel surface 24b and disengages from the second tapered surface 24c of the first locking groove 24.

[0033] exist Figure 3B In the state shown in FIG, when the fluid pressure acts on the main body 30, the main body 30 moves further in the direction of disconnection. Figure 3C As shown, the elastic ring member 25 enters between the first parallel surface 24 b of the first locking groove 24 and the parallel surface 37 b of the second locking groove 37 , and the upper outer peripheral corner P of the elastic ring member 25 contacts the first tapered surface 24 a of the first locking groove 24 . Figure 3C The diagram shows a state in which the upper outer peripheral corner portion P of the elastic ring member 25 is in contact with the first tapered surface 24 a of the first locking groove 24 .

[0034] exist Figure 3C In the illustrated state, movement of the main body 30 in the disconnection direction is restricted by the elastic ring member 25 and the first tapered surface 24a of the first retaining groove 24. Specifically, the elastic ring member 25 functions as a movement limit setting member, defining a limit of movement of the main body 30 relative to the adapter 20 in the disconnection direction, thereby releasing the connection between the adapter 20 and the main body 30. When the main body 30 reaches its movement limit, the elastic ring member 25 restricts movement of the main body 30 in the disconnection direction, thereby preventing further movement of the main body 30 in the disconnection direction. This prevents the main body 30 from disengaging from the adapter 20 and disconnecting from the adapter 20.

[0035] When the upper peripheral corner P of the elastic ring component 25 is in contact with the first conical surface 24a of the first retaining groove 24, a force F2 acts on the elastic ring component 25 from the first conical surface 24a. The force F2 is a force in the vertical direction relative to the first conical surface 24a. The elastic ring component 25 is reduced in diameter by the action of the horizontal component F21 of the force F2, and the inner peripheral surface of the elastic ring component 25 is pressed against the parallel surface 37b of the second retaining groove 37 of the main body 30. Therefore, the engagement margin (overlap margin) between the elastic ring component 25 and the orthogonal surface 37c of the second retaining groove 37 is larger than Figure 3A The large engagement margin shown further prevents the main body 30 from being dislodged from the adapter 20 and thus being disconnected.

[0036] Figure 3D 25b is formed on the outer periphery of the upper end of the elastic ring member 25. Figure 3D As shown, under the action of fluid pressure, the vibration of the elastic ring component 25 may cause the upper peripheral corner P of the elastic ring component 25 to be cut due to friction di with the second tapered surface 24c of the first retaining groove 24, thereby forming a tapered surface 25b. Even in this case, the elastic ring component 25 is pressed in the direction of diameter reduction due to the action of the horizontal component F31 of the force F3 perpendicular to the first tapered surface 24a of the first retaining groove 24. As a result, the elastic ring component 25 is pressed against the parallel surface 37b of the second retaining groove 37, thereby fully ensuring the engagement margin (overlap margin) between the elastic ring component 25 and the orthogonal surface 37c of the second retaining groove 37. Therefore, even under the action of fluid pressure on the main body 30, the main body 30 can be prevented from falling out of the adapter 20.

[0037] Figure 3A to Figure 3C In the description, the elastic ring member 25 is described as having a rectangular longitudinal cross-section. However, the elastic ring member 25 may have other shapes. Although not shown in the figure, the elastic ring member 25 may have a longitudinal cross-section having a shape obtained by chamfering the upper outer corner of a rectangle, a shape obtained by chamfering the upper outer corner and the lower outer corner of a rectangle, a shape obtained by chamfering the upper inner corner of a rectangle, a shape obtained by chamfering the upper outer corner and the upper inner corner of a rectangle, a shape obtained by chamfering the lower outer corner and the upper inner corner of a rectangle, or a shape obtained by chamfering the upper outer corner, the lower outer corner, and the upper inner corner of a rectangle.

[0038] like Figure 1 and Figure 2As shown, the pipe joint unit 100 also includes a rotation prevention component 10 that prevents relative rotation between the adapter 20 and the main body 30 that are connected to each other. Similar to the main body 30, the rotation prevention component 10 is made of polyamide 66 (PA66) reinforced with glass fiber (GF). This material is only an example, and the present invention is not limited to this. The material constituting the rotation prevention component 10 can be a resin material such as polyamide 66 (PA66), polyamide 12 (PA12), polyacetal (POM), polybutylene terephthalate (PBT), or a metal material such as brass forging (C3771), lead-free brass material, aluminum alloy, or stainless steel alloy.

[0039] The rotation preventing member 10 includes a first fitting portion 11 formed to be able to fit with the nut portion 22 of the adapter 20, and a second fitting portion 12 connected to the first fitting portion 11. Figure 2 As shown, in a state where the main body 30 is connected to the adapter 20 and the first fitting portion 11 is fitted with the nut portion 22 of the adapter 20 , the second fitting portion 12 is fitted with the flange portion 30C of the main body 30 .

[0040] Figure 4 It is along Figure 2 The cross-sectional view of line BB is shown. Figure 4 As shown, nut portion 22 is a so-called hexagonal nut. The outer circumference of nut portion 22 includes six flat surfaces 22a arranged in a ring around the axis of adapter 20 and curved portions 22b connecting adjacent flat surfaces 22a. Nut portion 22 may also not have curved portions 22b, and adjacent flat surfaces 22a may be connected via intersections or edges.

[0041] The first interlocking portion 11 of the rotation prevention component 10 accommodates the nut portion 22 of the adapter 20 and is interlocked with the outer periphery of the nut portion 22. When the first interlocking portion 11 and the nut portion 22 are interlocked, the axial center of the first interlocking portion 11 is roughly consistent with the axial center of the nut portion 22. A plurality of teeth 11a are formed on the inner periphery of the first interlocking portion 11 and are arranged in a ring shape around the axis of the first interlocking portion 11. The curved portion 22b of the nut portion 22 is arranged between adjacent teeth 11a. When the nut portion 22 and the first interlocking portion 11 are about to rotate relative to each other, the flat surface 22a of the nut portion 22 and the teeth 11a of the first interlocking portion 11 abut against each other. Therefore, when the first interlocking portion 11 and the nut portion 22 are interlocked, the first interlocking portion 11 cannot rotate relative to the adapter 20. The first fitting portion 11 and the nut portion 22 may be fitted with no gap at all or with a certain gap therebetween.

[0042] The number of teeth 11a of the first engaging portion 11 is greater than the number of bent portions 22b of the nut portion 22. Figure 4In the example shown, the nut portion 22 has six bent portions 22b, and the first engaging portion 11 has 18 teeth 11a. Therefore, the orientation of the first engaging portion 11 relative to the nut portion 22 can be changed to allow the first engaging portion 11 to engage with the nut portion 22. The configuration of the first engaging portion 11 and the nut portion 22 is not limited to Figure 4 In the example shown, it is preferable that the number of teeth 11 a is a natural multiple of the number of curved portions 22 b.

[0043] Figure 5 It is along Figure 2 The cross-sectional view of the CC line is shown. Figure 5 As shown, the outer periphery of the flange portion 30C of the main body 30 is formed into a non-circular shape. Specifically, the outer periphery of the flange portion 30C includes a pair of arcuate surfaces 30C1 located on opposite sides of the main body 30 in the radial direction and centered on the axis of the main body 30, and a pair of connecting surfaces 30C2 connecting the ends of the pair of arcuate surfaces 30C1. The connecting surfaces 30C2 include multiple flat surfaces and multiple curved portions.

[0044] The second interlocking portion 12 of the rotation preventing component 10 protrudes in an annular shape radially inward from the first interlocking portion 11. The second interlocking portion 12 accommodates the flange portion 30C and is interlocked with the outer periphery of the flange portion 30C. When the second interlocking portion 12 is interlocked with the flange portion 30C, the axial center of the second interlocking portion 12 is roughly consistent with the axial center of the flange portion 30C. The inner periphery of the second interlocking portion 12 is a shape corresponding to the outer periphery of the flange portion 30C and is formed into a non-circular shape. Specifically, the inner peripheral surface of the second interlocking portion 12 includes: a pair of arc surfaces 12a located on opposite sides of the radial direction of the second interlocking portion 12 and centered on the axis of the second interlocking portion 12, and a pair of connecting surfaces 12b connecting the ends of the pair of arc surfaces 12a. The connecting surface 12b includes a plurality of planes and a plurality of curved portions.

[0045] When the second fitting portion 12 and the flange portion 30C are about to rotate relative to each other, the connecting surface 12b of the second fitting portion 12 and the connecting surface 30C2 of the flange portion 30C abut against each other. Therefore, when the second fitting portion 12 and the flange portion 30C are fitted together, the second fitting portion 12 cannot rotate relative to the main body 30. Furthermore, the fitting of the second fitting portion 12 and the flange portion 30C can be performed with no gap at all or with a certain amount of gap between them.

[0046] Thus, when the first fitting portion 11 is fitted with the nut portion 22, the first fitting portion 11 cannot rotate relative to the adapter 20, and when the second fitting portion 12 is fitted with the flange portion 30C, the second fitting portion 12 cannot rotate relative to the main body 30. Therefore, when the adapter 20 and the main body 30 are connected and the first fitting portion 11 and the second fitting portion 12 of the rotation preventing member 10 are fitted to the nut portion 22 of the adapter 20 and the flange portion 30C of the main body 30, respectively, the rotation preventing member 10 can prevent relative rotation between the adapter 20 and the main body 30.

[0047] Figure 6 It is along Figure 2 The cross-sectional view of the DD line is shown. Figure 5 and Figure 6 As shown, a recess 30C3 is formed on the arc surface 30C1 of the flange portion 30C of the main body 30. The recess 30C3 is formed as the arc surface 30C1 in the axial direction of the main body 30. A protrusion 13 is formed on the arc surface 12a of the second fitting portion 12 of the rotation prevention component 10, which is inserted into and hooked into the recess 30C3 of the flange portion 30C. When the protrusion 13 is hooked into the recess 30C3, the relative movement of the main body 30 and the second fitting portion 12 in the axial direction of the main body 30 is restricted. In other words, the protrusion 13 acts as a restriction portion that restricts the relative movement of the main body 30 and the second fitting portion 12 in the axial direction of the main body 30.

[0048] Because the recessed portion 30C3 of the flange portion 30C and the protruding portion 13 of the rotation preventing member 10 restrict relative movement between the main body 30 and the second fitting portion 12 in the axial direction of the main body 30, when the main body 30 moves in its axial direction, the second fitting portion 12 moves along with the main body 30. Therefore, the engagement between the second fitting portion 12 and the flange portion 30C can be prevented from being released, and relative rotation between the adapter 20 and the main body 30 can be more reliably prevented.

[0049] The second interlocking portion 12 includes a through-hole 12c located radially away from the protrusion 13 of the main body 30. Therefore, the inner portion 12d of the second interlocking portion 12, located radially inward of the main body 30 relative to the through-hole 12c, is more easily deformed than in a case where the through-hole 12c is not provided. Furthermore, the protrusion 13 and the recess 30C3 are tapered at the top and bottom. Therefore, when the rotation preventing component 10 is moved upward, the tapered portions contact each other, pushing and expanding the inner portion 12d radially outward of the main body 30. Therefore, the protrusion 13 can be easily displaced radially toward the main body 30 without extending the second interlocking portion 12 axially along the main body 30, and the protrusion 13 can be easily removed from the recess 30C3 of the flange portion 30C. This removes the restriction on the relative movement between the main body 30 and the second interlocking portion 12, providing a compact and easily removable rotation preventing component 10.

[0050] When viewing the anti-rotation component 10 along the axial direction of the first fitting portion 11, the through-hole 12c is located on the inner side of the first fitting portion 11. An outer portion 12e of the second fitting portion 12, located radially outward of the main body 30 relative to the through-hole 12c, reduces deformation of the second fitting portion 12 in the direction of increasing the distance between the pair of connecting surfaces 12b. This prevents increased play when the second fitting portion 12 and the flange portion 30C are engaged. Furthermore, the anti-rotation component 10 is provided with a guide 12h that protrudes from the second fitting portion 12 in a direction opposite to the connection direction.

[0051] Figure 7 The semi-longitudinal sectional view shows the state in which the rotation preventing member 10 is moved to the upper direction of the figure to the limit, corresponding to Figure 2 To express. Figure 7 In the illustrated state, the nut portion 22 of the adapter 20 is removed from the first engaging portion 11 of the anti-rotation member 10, releasing the engagement between the nut portion 22 and the first engaging portion 11. Consequently, the anti-rotation member 10 can rotate relative to the adapter 20. This allows the orientation of the anti-rotation member 10 relative to the adapter 20 to be changed, and the orientation of the main body 30 relative to the adapter 20 to be changed.

[0052] The movement of the anti-rotation member 10 in the direction of disconnection and the rotation of the main body 30 and the anti-rotation member 10 relative to the adapter 20 are performed manually, for example.

[0053] like Figure 2 As shown, the second fitting portion 12 of the rotation preventing member 10 has an opposing surface 12 f that faces the horizontal portion 30B of the main body 30 and the cover 34 in the axial direction of the main body 30 . Figure 8 It is along Figure 7 The figure showing the rotation preventing member 10 is viewed in the direction of the arrow E shown. Figure 8 In the figure, the tube 1 is omitted. Figure 2 and Figure 8 As shown, a recess 12g is formed on the facing surface 12f. Therefore, the horizontal portion 30B and the cover 34 can be brought close to the adapter 20 without interfering with the second fitting portion 12, and the pipe joint unit 100 can be miniaturized.

[0054] <Second embodiment> Figure 9This is a half-longitudinal cross-sectional view of a pipe joint unit 200 having a rotation preventing member 210 according to this embodiment, showing the state in which the adapter 220 and the main body 30 are connected. The following mainly describes the differences from the first embodiment. Configurations identical or corresponding to those described in the first embodiment are denoted by the same reference numerals as in the first embodiment, and description thereof will be omitted.

[0055] In this embodiment, a flow path 221 formed by circular holes 220a and 220b of different diameters is provided through the axial center of the adapter 220 as a female component. Figure 9 A cylindrical portion 228 is provided above the nut portion 22 at an intermediate height position in the vertical direction. The first locking groove 24 and the annular groove 26 are formed on the inner periphery of the large diameter circular hole 220a of the adapter 220.

[0056] In this embodiment, the anti-rotation member 210 further includes a connecting portion 214 connecting the first fitting portion 11 and the second fitting portion 212. The connecting portion 214 is cylindrical and receives the cylindrical portion 228 of the adapter 220. The second fitting portion 212 protrudes radially outward in an annular shape from the connecting portion 214.

[0057] Figure 10 It is along Figure 9 The cross-sectional view of the FF line is shown. Figure 9 and Figure 10 As shown, the second fitting portion 212 has a through-hole 212c located at a position radially away from the protrusion 13 of the main body 30. The connecting portion 214 has a through-hole 215 below the inner portion 12d of the second fitting portion 212, which is located radially inward of the main body 30 relative to the through-hole 212c. Therefore, the inner portion 12d of the second fitting portion 212 is easier to displace than in the case where the through-hole 215 is not provided. In addition, the upper and lower portions of the protrusion 13 and the recess 30C3 form tapered portions. Therefore, when the rotation prevention component 210 is moved upward, the tapered portions contact each other, causing the inner portion 12d to be pushed and expanded radially outward of the main body 30. Therefore, the protrusion 13 can be easily displaced radially toward the main body 30, and the protrusion 13 can be easily pulled out of the recess 30C3. This removes the restriction on the relative movement between the main body 30 and the second fitting portion 212 , and provides the rotation preventing member 210 which is compact and easy to attach to and detach from the main body 30 .

[0058] The other structures of the pipe joint unit 200 are similar to those of the pipe joint unit 100 of the first embodiment (see Figure 1 etc.) have the same structure.

[0059] The basic structure of the anti-rotation member 210 and the pipe joint unit 200 of the present embodiment constructed as described above is similar to that of the anti-rotation member 10 and the pipe joint unit 100 of the first embodiment (see Figure 1 Therefore, in the anti-rotation member 210 and the pipe joint unit 200 of this embodiment, the same effects as those obtained in the first embodiment can be obtained.

[0060] <Third embodiment> Figure 11 This is a half-longitudinal cross-sectional view of a pipe joint unit 300 having a rotation preventing member 310 according to this embodiment, showing a state before the adapter 320 and the main body 330 are connected. The following description focuses on the differences from the first embodiment. Configurations identical or corresponding to those described in the first embodiment are denoted by the same reference numerals as in the first embodiment, and their description is omitted.

[0061] Compared to the pipe joint unit 100 of the first embodiment (see Figure 1 In the pipe joint unit 300 of this embodiment, the female and male components are arranged in reverse. That is, the adapter 320 is the male component, and the main body 330 is the female component. The adapter 320 is inserted into the main body 330, thereby connecting the adapter 320 and the main body 330.

[0062] A circular hole 330a is formed on the vertical portion 330A of the main body 330, and a first retaining groove 334 and an annular groove 336 are formed on the inner periphery of the circular hole 330a. The first retaining groove 334 is similar to the first retaining groove 24 in the first embodiment (see FIG. Figure 1 etc.) The same terrain is formed along the direction Figure 11 The elastic ring member 335 is fitted and retained in the first locking groove 334. A sealing member 337 is fitted in the annular groove 336.

[0063] The nut portion 22 is integrally formed at a mid-height position on the outer periphery of the adapter 320. The portion located above the nut portion 22 constitutes an insertion portion 320A1 that is inserted into the circular hole 330a of the main body 330. A tapered surface 320c is formed on the outer periphery of the upper end of the insertion portion 320A1, which expands downward (in the connection direction). A second retaining groove 327 is formed along the entire circumference of the insertion portion 320A1.

[0064] The second retaining groove 327 is similar to the second retaining groove 37 in the first embodiment (see Figure 1 etc.) are similarly formed as they move towards Figure 11When the adapter 320 is inserted into the main body 330 until the second retaining groove 327 of the adapter 320 is aligned with the first retaining groove 334 of the main body 330, the elastic ring member 335 is installed across the second retaining groove 327 of the adapter 320 and the first retaining groove 334 of the main body 330.

[0065] The other structures of the pipe joint unit 300 are similar to those of the pipe joint unit 100 of the first embodiment (see Figure 1 etc.) have the same structure.

[0066] The basic structure of the anti-rotation member 310 and the pipe joint unit 300 of the present embodiment constructed as described above is similar to that of the anti-rotation member 10 and the pipe joint unit 100 of the first embodiment (see Figure 1 Therefore, in the anti-rotation component 310 and the pipe joint unit 300 of this embodiment, the same effects as those obtained in the first embodiment can be obtained.

[0067] Although not shown in the figure, the connection portion 214 of the adapter 220 in the second embodiment may be provided below the flange portion 330C (see Figure 9 ), the connection portion 214 of the rotation preventing member 210 in the second embodiment is provided on the rotation preventing member 310 (refer to Figure 9 ).

[0068] <Fourth embodiment> Figure 12 is a cross-sectional view of a main portion of a pipe joint unit 400 having a rotation preventing member 410 according to this embodiment, corresponding to Figure 5 To express. Figure 13 is a cross-sectional view of a main portion of a pipe joint unit 400 having a rotation preventing member 410 according to this embodiment, corresponding to Figure 6 The following description will focus mainly on the differences from the first embodiment, and configurations identical or corresponding to those described in the first embodiment are denoted by the same reference numerals as those in the first embodiment in the drawings, and description thereof will be omitted.

[0069] The pipe joint unit 400 of this embodiment is different from the pipe joint unit 100 of the first embodiment (see Figure 1 The recessed portion 30C3 of the main body 30 is positioned opposite the protruding portion 13 of the anti-rotation component 10. Specifically, the protruding portion 430C3 is formed on the arcuate surface 430C1 of the flange portion 430C of the main body 430. The recessed portion 413 into which the protruding portion 430C3 of the flange portion 430C is inserted and engaged is formed on the arcuate surface 412a of the second engaging portion 412 of the anti-rotation component 410.

[0070] When recessed portion 413 is engaged with protrusion 430C3, relative movement between main body 430 and second fitting portion 412 in the axial direction of main body 430 is restricted. In other words, recessed portion 413 functions as a restrictor that limits relative movement between main body 430 and second fitting portion 412 in the axial direction of main body 430. By radially displacing recessed portion 413 toward main body 430, protrusion 430C3 of flange portion 430C is removed from recessed portion 413, releasing the restriction on relative movement between main body 430 and second fitting portion 412. This allows attachment and detachment of anti-rotation component 410 to main body 430.

[0071] The other structures of the pipe joint unit 400 are similar to those of the pipe joint unit 100 of the first embodiment (see Figure 1 etc.) have the same structure.

[0072] The basic structure of the anti-rotation member 410 and the pipe joint unit 400 of the present embodiment constructed as described above is similar to that of the anti-rotation member 10 and the pipe joint unit 100 of the first embodiment (see Figure 1 Therefore, in the anti-rotation component 410 and the pipe joint unit 400 of this embodiment, the same effects as those obtained in the first embodiment can be obtained.

[0073] <Fifth embodiment> Figure 14 It is a half longitudinal sectional view of the pipe joint unit 500 having the anti-rotation member 510 according to the present embodiment, and shows a state before the adapter 20 and the main body 530 are connected. Figure 15 is a cross-sectional view of a main portion of a pipe joint unit 500 having a rotation preventing member 510 according to this embodiment, corresponding to Figure 6 To express. Figure 16 1 is a cross-sectional view showing the main part of the pipe joint unit 500 having the rotation preventing member 510 according to the present embodiment when pressurized by air, corresponding to Figure 6 The following description will focus mainly on the differences from the first embodiment, and configurations identical or corresponding to those described in the first embodiment are denoted by the same reference numerals as those in the first embodiment in the drawings, and description thereof will be omitted.

[0074] like Figure 14 and Figure 15 As shown, in the pipe joint unit 500 of this embodiment, the recess 530C3 of the body 530 is formed from the vertical center to the bottom of the flange portion 530C. The protrusion 513 of the anti-rotation member 510 is formed from the vertical center to the bottom of the second fitting portion 512.

[0075] When the second engaging portion 512 is engaged with the flange portion 530C of the main body 530, the protrusion 513 of the anti-rotation member 510 is engaged with the recess 530C3 of the main body 530. The inner diameter of the protrusion 513 and the outer diameter of the recess 530C3 are substantially the same, so the anti-rotation member 510 can be easily engaged with the main body 530 without having to recess the protrusion 513 radially outward. If only the anti-rotation member 510 shifts upward, the protrusion 513 acts as a stopper, preventing the anti-rotation member 510 from falling out.

[0076] In the case where the pipe joint unit 500 is pressurized by air, as Figure 16 As shown, the main body 530 moves in the direction opposite to the connection direction. The anti-rotation member 510 remains attached to the adapter 20, and the engagement length between the protrusion 513 of the anti-rotation member 510 and the recess 530C3 of the main body 530 is shortened. The anti-rotation member 510 is provided with a guide 12h that protrudes from the second engagement portion 512 in the direction opposite to the connection direction. The guide 12h ensures a sufficient engagement margin between the anti-rotation member 510 and the main body 530.

[0077] The other structures of the pipe joint unit 500 are similar to those of the pipe joint unit 100 of the first embodiment (see Figure 1 The concave portion 530C3 and the convex portion 513 are also applicable to the second to fourth embodiments.

[0078] The basic structure of the anti-rotation member 510 and the pipe joint unit 500 of the present embodiment constructed as described above is similar to that of the anti-rotation member 10 and the pipe joint unit 100 of the first embodiment (see Figure 1 Therefore, in the anti-rotation component 510 and the pipe joint unit 500 of this embodiment, the same effects as those obtained in the first embodiment can be obtained.

[0079] <Sixth embodiment> Figure 17 It is a half longitudinal sectional view of the pipe joint unit 600 having the anti-rotation member 10 according to the present embodiment, and shows a state before the adapter 20 and the main body 530 are connected. Figure 18 is a cross-sectional view of a main portion of a pipe joint unit 600 having a rotation preventing member 10 according to this embodiment, corresponding to Figure 6 To express. Figure 19 1 is a cross-sectional view showing the main part of the pipe joint unit 600 having the rotation preventing member 10 according to the present embodiment when pressurized by air, corresponding to Figure 6Hereinafter, the differences from the fifth embodiment will be mainly described, and the same or corresponding structures as those described in the fifth embodiment are denoted by the same reference numerals as those in the fifth embodiment in the drawings, and description thereof will be omitted.

[0080] like Figure 17 and Figure 18 As shown, in the pipe joint unit 600 of this embodiment, the recessed portion 530C3 of the main body 530 is formed from the middle of the flange portion 530C in the vertical direction to the lower end. As in the fifth embodiment, when mating the main body 530 with the anti-rotation member 10, the protruding portion 13 does not need to be recessed in the radial direction, allowing the anti-rotation member 10 to be easily mated with the main body 530. If only the anti-rotation member 10 shifts upward, the protruding portion 13 acts as a stopper, preventing the anti-rotation member 10 from falling out.

[0081] To change the angle between the adapter 20 and the main body 530, when the anti-rotation component 10 is forcibly displaced upward and released from the engagement with the main body 530, the protrusion 13 has a shorter vertical length than the fifth embodiment, and thus the length of the arcuate surface 12a extending over the recess 530C3 is also shorter. Therefore, the anti-rotation component 10 can be easily released from the main body 530, and the angle between the adapter 20 and the main body 530 can be easily changed.

[0082] In the case where the pipe joint unit 600 is pressurized by air, as shown in FIG. Figure 19 As shown, the main body 530 moves in the direction opposite to the connection direction. The anti-rotation component 10 remains attached to the adapter 20, and the engagement length between the protrusion 13 of the anti-rotation component 10 and the recess 530C3 of the main body 530 is shortened. The anti-rotation component 10 is provided with a guide 12h that protrudes from the second engagement portion 12 in the direction opposite to the connection direction. This guide 12h ensures a sufficient engagement margin between the anti-rotation component 10 and the main body 530.

[0083] <Seventh embodiment> Figure 20 This is a half longitudinal sectional view of the pipe joint unit 700 having the anti-rotation member 10 according to this embodiment, showing a state before the adapter 20 and the main body 730 are connected. The main body 730 is provided with a rib 738 protruding from the flange portion 730C in the direction opposite to the connection direction. Figure 21 is a cross-sectional view of a main portion of a pipe joint unit 700 having a rotation preventing member 10 according to this embodiment, corresponding to Figure 18 To express. Figure 22 This is a cross-sectional view of the main portion immediately before the anti-rotation member 10 is fitted into the pipe joint unit 700 from the upper side according to the present embodiment.

[0084] By providing the rib 738, even when attempting to tilt the anti-rotation component 10, the recess below the protrusion 13 of the anti-rotation component 10 can first contact the rib 738, so that the rib 738 serves as a guide to guide the protrusion 13 to the recess 730C3 for engagement.

[0085] As mentioned above, although embodiment and modification of this invention were demonstrated, this invention is not limited to the said embodiment and modification, It can change suitably within the range of the summary of this invention.

[0086] Not only Figure 3A to Figure 3C The adapter 20 in the illustrated operation has an edge. For a shape in which the main body 30 and the adapter 20 are press-fitted, the anti-rotation member 10 can be mounted by providing a flange portion 30C on the main body 30 side.

[0087] The ribs 738 provided on the main body 730 of the seventh embodiment can also be applied to the main bodies 30, 330, and 530 of the first to fifth embodiments. In other words, the main bodies 30, 330, and 530 can also be provided with ribs that protrude from the flange portions 30C, 330C, and 530C in a direction opposite to the connection direction. Description of Reference Numerals

[0088] 100, 200, 300, 400, 500, 600, 700: pipe joint unit; 10, 210, 310, 410, 510: anti-rotation components; 11: The first chimeric part; 12, 212, 412, 512: second chimeric part; 12c, 212c: through holes; 13, 430C3, 513: convex part; 20, 220, 320: adapter (one connector); 30, 330, 430, 530: main body (another connector); 30C3, 413, 530C3: concave parts.

Claims

1. A rotation preventing member for a pipe joint for preventing a pair of mutually connected joints from rotating relative to each other, wherein: include: a first fitting portion formed to be able to fit into one of the pair of fittings; a second fitting portion connected to the first fitting portion, and fitting with the other fitting of the pair of fittings in a state where the one fitting fitted with the first fitting portion is connected to the other fitting; The limiting portion is provided on the second fitting portion, and limits the relative movement of the other joint and the second fitting portion in the axial direction of the other joint when the other joint is fitted with the second fitting portion. The limiting portion is a convex portion or a concave portion hung on the other joint, The second fitting portion has a through hole, and the through hole is located at a position away from the convex portion or the concave portion in the radial direction of the other joint.

2. The anti-rotation component for a pipe joint according to claim 1, wherein: The second fitting portion has an opposing surface that is opposed to the other joint in the axial direction when the other joint is fitted with the second fitting portion. A recess is formed on the facing surface.

3. A pipe joint unit, wherein: include: A pair of connectors connected to each other; as well as The pipe joint anti-rotation component prevents the relative rotation of the pair of joints. The pipe joint anti-rotation component includes: a first engaging portion engaging with one of the pair of connectors; a second fitting portion connected to the first fitting portion and fitted with the other connector of the pair of connectors; and a limiting portion, provided on the second fitting portion, to limit the relative movement of the other joint and the second fitting portion in the axial direction of the other joint, The limiting portion is a convex portion or a concave portion hung on the other joint, The second fitting portion has a through hole, and the through hole is located at a position away from the convex portion or the concave portion in the radial direction of the other joint.

4. The pipe joint unit according to claim 3, wherein Also includes: a movement limit setting member provided across the pair of joints and configured to define a movement limit of the other joint relative to the one joint in a connection release direction for releasing the connection between the pair of joints; In a state where the other joint is moved relative to the one joint in the coupling release direction to the movement limit, the one joint and the first fitting portion are released from fitting.

5. The pipe joint unit according to claim 3, wherein The second fitting portion has an opposing surface facing the other joint along the axial direction, A recess is formed on the facing surface.

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