CN109869551B

CN109869551B - Pipe joint and pipe connection method

Info

Publication number: CN109869551B
Application number: CN201811049755.5A
Authority: CN
Inventors: 户泽陆奥雄; 竹中泰纪; 儿玉政美
Original assignee: A Raymond SARL
Current assignee: A Raymond SARL
Priority date: 2017-12-01
Filing date: 2018-09-10
Publication date: 2023-06-06
Anticipated expiration: 2038-09-10
Also published as: CN209164814U; WO2019107062A1; CN109869551A; JP2019100451A

Abstract

The object is to provide a pipe joint and a pipe connection method which can be assembled easily. The pipe joint is provided with: a tubular member that partially covers a 1 st tube inserted from one end and partially covers a 2 nd tube inserted from the other end opposite to the one end; a 1 st body having a 1 st through hole capable of covering at least a part of a portion of the tubular member covering the 1 st pipe; and a second body having a second through-hole capable of covering at least a part of a portion of the tubular member covering the second pipe 2; the 1 st body and the 2 nd body are engageable with each other, and are configured to seal between the 1 st pipe and the tubular member and between the 2 nd pipe and the tubular member, respectively, when the 1 st body and the 2 nd body are engaged with each other.

Description

Pipe joint and pipe connection method

Technical Field

The present invention relates to a pipe joint for tightly connecting 2 pipes and a pipe connection method using the same.

Background

As a pipe joint for tightly connecting 2 pipes, there is a structure in which a member attached to one pipe is detachably engaged (connected) with a member attached to the other pipe (for example, refer to patent documents 1 and 2). Patent document 1 discloses a structure comprising: the connection member attached to one pipe is assembled to the guide member attached to the other pipe, and the connection member (engagement hook) is engaged with the guide member (undercut). Patent document 2 discloses a structure including: the cylindrical member attached to one pipe is assembled to the female member attached to the other pipe, and the cylindrical member (the locking hole, the locking claw) is engaged with the female member (the locking protrusion, the locking step). According to such a pipe joint, the 2 pipes can be tightly connected by a simple operation of combining the 2 members and engaging them, and the 2 pipes can be separated by releasing the engagement of the 2 members, as compared with the case of connecting the 2 pipes by brazing or welding, so that there is an advantage of easy maintenance.

Patent document 1: DE102014220012A1

Patent document 2: US5219188A

Disclosure of Invention

The following analysis is given by the inventors of the present application.

However, the connection element and the guide element described in patent document 1 have a correspondence relationship with the attached tube, and the cylindrical member and the female member of patent document 2 also have a correspondence relationship with the attached tube, so that there is a possibility that the correspondence relationship may be wrong at the time of assembly.

The object of the present invention is to provide a new pipe joint and a pipe connection method which can be assembled simply.

According to claim 1, there is provided a pipe joint. The pipe joint includes: a tubular member that partially covers a1 st tube inserted from one end and partially covers a 2 nd tube inserted from the other end opposite to the one end; a1 st body having a1 st through hole capable of covering at least a part of a portion of the tubular member covering the 1 st pipe; and a 2 nd body having a 2 nd through hole capable of covering at least a part of a portion of the tubular member covering the 2 nd pipe. The 1 st body and the 2 nd body can be engaged with each other. The pipe joint is configured to seal between the 1 st pipe and the tubular member and between the 2 nd pipe and the tubular member, respectively, when the 1 st body and the 2 nd body are engaged. The 1 st body has at least 1 st engaging portion engageable with the 2 nd body. The 2 nd body has at least 12 nd engaging portion engageable with the 1 st body. The 1 st body has at least 1 st engaged portion engageable with the corresponding 2 nd engaging portion. The 2 nd body has at least 12 nd engaged portions engageable with the corresponding 1 st engaging portions.

According to claim 2, there is provided a pipe connection method. The pipe connection method is a pipe connection method for connecting pipes using the pipe joint according to the above-mentioned claim 1. The pipe connection method includes: a step of assembling the 1 st body and the 2 nd body so as to accommodate the tubular member in the 1 st through hole and the 2 nd through hole; inserting a 1 st tube into the 1 st through hole from one end to the tubular member in a state where the 1 st body and the 2 nd body are assembled; inserting a 2 nd pipe into the 2 nd through hole from the other end to the tubular member in a state where the 1 st body and the 2 nd body are assembled; and a step of engaging the 1 st body with the 2 nd body to seal between the 1 st pipe and the tubular member and between the 2 nd pipe and the tubular member.

The invention has the advantages that:

according to the above-mentioned 1 st and 2 nd aspects, the assembly can be simplified.

Drawings

Fig. 1 is an exploded perspective view schematically showing an example of the structure of a pipe joint according to embodiment 1.

Fig. 2 is a perspective view schematically showing an example of a structure at the time of engagement of the pipe joint according to embodiment 1.

Fig. 3 is a cross-sectional view schematically showing an example of a structure at the time of engagement of the pipe joint according to embodiment 1, when the pipe joint is cut in the Y direction so as to pass through the central axis CA of fig. 2.

Fig. 4 is a perspective view schematically showing an example of the structure of the body 2 of the pipe joint according to embodiment 1.

Fig. 5 is a perspective view schematically showing a state before the 1 st pipe and the 2 nd pipe are inserted when the pipe joint according to embodiment 1 is temporarily engaged.

Fig. 6 is a perspective view schematically showing a state immediately after the 1 st pipe and the 2 nd pipe are inserted when the pipe joint according to embodiment 1 is temporarily engaged.

Fig. 7 is a cross-sectional view schematically showing an example of the structure of the body 2 and the tubular member of the pipe joint according to embodiment 2, when the pipe joint is cut in the Y direction so as to pass through the central axis CA.

Description of the reference numerals

1 pipe joint

10 1 st pipe

11 part 1

12 1 st outer diameter varying portion

Part 13 part 2

20 nd tube

21 part 3

22 nd outer diameter variation part

23 part 4

30. 80 tubular member

31 st step part 1

32 nd step portion 2

33 bushing portion

40 body 1

40a main body

41 st engaging portion (engaging arm)

41a 1 st window portion

41b 1 st slot portion

41c No. 1 projection

41d 1 st airfoil portion

42 st engaged portion 1

42a 1 st jaw portion

42b 3 rd jaw

43 st through hole 1

44 st opening portion 1

44a 1 st guide portion

45 1 st slit

46 st rotation suppressing portion 1

47 1 st handle portion (rod)

48 1 st guard

50 body 2

50a main body

51 nd engaging portion (engaging arm)

51a 2 nd Window

51b 2 nd slot portion

51c No. 2 protrusion

51d No. 2 airfoil portion

52 nd 2 nd engaged portion

52a 2 nd jaw portion

52b 4 th jaw portion

53 nd through hole

53a No. 2 pressing part

54 nd opening portion

54a 2 nd guide

55 nd slit 2

56 No. 2 rotation suppressing portion

57 nd handle portion (lever)

58 nd protective part

60 st seal member

70 # 2 seal part

Detailed Description

Hereinafter, embodiments will be described with reference to the drawings. In addition, where reference numerals are used in the present application, they are used exclusively to assist understanding and are not intended to be limited to the illustrated form. The following embodiments are merely examples, and do not limit the present invention.

Embodiment 1

The pipe joint according to embodiment 1 will be described with reference to the drawings. Fig. 1 is an expanded perspective view schematically showing the structure of a pipe joint according to embodiment 1. Fig. 2 is a perspective view schematically showing a structure at the time of engagement of the pipe joint according to embodiment 1. Fig. 3 is a cross-sectional view schematically showing a structure at the time of engagement of the pipe joint according to embodiment 1, when the pipe joint is cut in the Y direction so as to pass through the center axis CA of fig. 2. Fig. 4 is a perspective view schematically showing the structure of the body 2 of the pipe joint according to embodiment 1.

The pipe joint 1 is an assembly in which a 1 st pipe 10 and a 2 nd pipe 20 are tightly connected (see fig. 1). The pipe joint 1 may be used, for example, instead of a portion to be brazed or welded as a metal pipe through which a refrigerant in a refrigerator flows. The pipe joint 1 has a tubular member 30, a 1 st body 40, a 2 nd body 50, a 1 st seal member 60, and a 2 nd seal member 70.

Here, the 1 st pipe 10 and the 2 nd pipe 20 are tubular members through which fluid (liquid or gas) flows. In the 1 st pipe 10 and the 2 nd pipe 20, metal pipes (e.g., copper pipe, aluminum pipe) may be used. The 1 st pipe 10 has a 1 st portion 11 having a predetermined length from an end surface facing the 2 nd pipe 20, a 2 nd portion 13 having a smaller outer diameter than the 1 st portion 11, and a 1 st outer diameter changing portion 12 having a smaller outer diameter from the 1 st portion 11 to the 2 nd portion 13. The 2 nd pipe 20 has a 3 rd portion 21 having a predetermined length from the end face facing the 1 st pipe 10, a 4 rd portion 23 having an outer diameter smaller than the 3 rd portion 21, and a 2 nd outer diameter changing portion 22 having an outer diameter smaller from the 3 rd portion 21 to the 4 th portion 23. The outer diameter of the 3 rd portion 21 may be set to be the same as the outer diameter of the 1 st portion 11. The outer diameter of the 4 th portion 23 may be set to be the same as the outer diameter of the 2 nd portion 13. The shape of the outer peripheral surface of the 2 nd outer diameter changing portion 22 may be the same as the shape of the outer peripheral surface of the 1 st outer diameter changing portion 12.

The tubular member 30 is a tubular member. For the tubular member 30, for example, glass fiber reinforcement PBT (Polybutylene terephthalate) may be used. The tubular member 30 can partially cover the 1 st tube 10 in a state inserted from one end and partially cover the 2 nd tube 20 inserted from the other end. At least a part of the portion of the tubular member 30 covering the 1 st tube 10 can be covered with the 1 st through hole 43. At least a part of the portion of the tubular member 30 covering the 2 nd tube 20 can be covered with the 2 nd through hole 53. A part of the tubular member 30 can be covered with the 1 st protection portion 48 and the 2 nd protection portion 58. The tubular member 30 has a 1 st step portion 31 recessed radially outward from the inner peripheral surface at one end of the inner peripheral surface, and a 2 nd step portion 32 recessed radially outward from the inner peripheral surface at the other end of the inner peripheral surface. The tubular member 30 has a bushing portion 33 protruding radially inward from the inner peripheral surface in the vicinity of the central portion of the inner peripheral surface. When the 1 st body 40 and the 2 nd body 50 are engaged with each other, the tubular member 30 and the 1 st tube 10 are sealed with each other via the 1 st seal member 60. When the 1 st body 40 and the 2 nd body 50 are engaged with each other, the tubular member 30 and the 2 nd tube 20 are sealed with each other via the 2 nd seal member 70.

The 1 st body 40 is a female structure (connector) through which the 1 st tube 10 is inserted and attached to the 1 st tube 10. The 1 st body 40 may have the same structure (configuration) as the 2 nd body 50. For the 1 st body 40, an elastically deformable material such as glass fiber reinforcement POM (Polyoxymethylene), PA12GF (Polyamide 12 glass fiber) or the like may be used. In order to secure strength, the 1 st body 40 may have a thicker wall thickness in a part of the main body 40a (for example, in the root portion of the 1 st engaging portion 41). The 1 st body 40 can be engaged with the 2 nd body 50. The 1 st body 40 is configured to seal the 1 st tube 10 from the tubular member 30 via the 1 st seal member 60 when engaged with the 2 nd body 50. The 1 st body 40 has, as main components, a1 st engaged portion 41, a1 st engaged portion 42, a1 st through hole 43, a1 st opening portion 44, a1 st slit 45, a1 st rotation suppressing portion 46, a1 st handle portion 47, and a1 st protecting portion 48. The respective constituent parts 41 to 48 are integrally formed with the main body 40a of the 1 st body 40. The 1 st body 40 may be configured to have a substantially V-shape, a U-shape, or a Y-shape when viewed from a predetermined direction.

The 1 st engagement portion 41 is a portion (arm) that can be engaged with the 2 nd engaged portion 52 of the corresponding 2 nd body 50. The 1 st engagement portion 41 is configured to have a substantially arm shape (may be substantially fork-shaped or substantially rod-shaped) extending from the outer surface of the main body 40a of the 1 st body 40 toward the outer surface of the main body 50a of the 2 nd body 50 in the central axis CA direction. The 1 st engagement portion 41 may be configured to have 2 (a pair) opposing each other with a space therebetween as shown in the drawing, but 1 or more engagement portions may be used. The 1 st engagement portion 41 may be disposed at a position rotated by 90 degrees from the 1 st engaged portion 42 about the central axis CA. The 1 st engagement portion 41 may be disposed at a position rotated by 90 degrees from the 2 nd engagement portion 51 about the central axis CA when the 1 st body 40 is engaged with the 2 nd body 50. The 1 st engagement portion 41 is separated from the tubular member 30 when the 1 st body 40 is engaged with the 2 nd body 50. The 1 st engaging portion 41 is configured to be elastically deformable. The 1 st engagement portion 41 is slidable in the direction of the central axis CA on the 2 nd rotation suppressing portion 56, and rotation about the central axis CA is suppressed by the 2 nd rotation suppressing portion 56. The 1 st engagement portion 41 has a1 st window portion 41a, a1 st slot portion 41b, a1 st projection portion 41c, and a1 st tab portion 41d.

The pair of 1

st holding portions

41, 41 extend in the 1 st axial direction in an arm shape to form a fork-shaped arm pair, and a hollow portion is formed therebetween. The same applies to the 1

st holding portions

51, 51. According to the example shown in fig. 1, the 1 st pair of engaging portions (engaging arms) and the 2 nd pair of engaging portions are oriented in an angular relationship rotated 90 degrees with respect to each other, and are configured to be slidably fitted on the radially outer portions of the non-arms of the pair of engaging arms on the opposite side. I.e. constitutes a so-called nested coupling assembly. The base of each

engagement arm pair

41, 51 engages with the

main body

40, 50, and is configured in a cantilever-like shape. As a result, each pair of engagement arms has a U-shape or コ -shape when viewed from the base portion (the joint portion to the main body) thereof.

The 1 st window 41a is a window-shaped portion that can be engaged with the 2 nd claw 52a of the 2 nd body 50. The 1 st window portion 41a is formed on the front end side of the 1 st engaging portion 41 with respect to the 1 st slot portion 41 b. The 1 st window 41a has a 1 st fin 41d protruding from the front wall surface toward the root.

The 1 st slot portion 41b is a slot-like portion that is slidably engaged with the 4 th claw portion 52b of the 2 nd body 50 within a predetermined length along the extending direction of the 1 st engagement portion 41. The 1 st slot portion 41b is formed on the root side of the 1 st engagement portion 41 than the 1 st window portion 41 a. The 1 st slot 41b and the 4 th claw 52b are temporarily engaged with each other before the 1 st window 41a and the 2 nd claw 52a are engaged with each other in the assembling step.

The 1 st projection 41c is a portion protruding from the distal end portion of the 1 st engagement portion 41. The 1 st projecting portion 41c is configured such that, when the 4 st claw portion 52b is temporarily engaged with the 1 st slot portion 41b and the 2 nd claw portion 52a is not engaged with the 1 st window portion 41a, the 1 st projecting portion 41c is inserted into the 2 nd slit 55 of the 2 nd claw portion 52a, and when the 1 st projecting portion 41c is pushed inward in the radial direction in this state, the 2 nd slit 55 is opened, and the 3 rd portion 21 of the 2 nd tube 20 can be inserted into the 2 nd through hole 53 from the 2 nd opening portion 54.

The 1 st tab 41d is a claw-like portion that is inserted into the 2 nd slit 55 of the 2 nd claw 52a when the 1 st window 41a is engaged with the 2 nd claw 52 a.

The 1 st engaged portion 42 is a portion that can be engaged with the 2 nd engaging portion 51 of the corresponding 2 nd body 50. The 1 st engaged portions 42 and the 1 st engaged portions 41 are alternately arranged in the circumferential direction. The number of the engaged portions 42 in the 1 st embodiment is 2 in the drawing, but 1 or more may be used. The 1 st engaged portion 42 has a 1 st claw portion 42a and a 3 rd claw portion 42b provided on the outer surface of the body 40a of the 1 st torso 40. The 1 st claw portion 42a is a claw-like portion that can engage with the 2 nd window portion 51 a. The 3 rd nail portion 42b is a claw-like portion that is slidably and temporarily engaged with the 2 nd slot portion 51b in a range of a predetermined length along the extending direction of the 2 nd engagement portion 51. The 1 st claw portion 42a is disposed on the 1 st tube 10 side of the 3 rd claw portion 42b.

The 1 st through hole 43 is a through hole through which the 1 st pipe 10 can be inserted. The inner peripheral surface of the 1 st through hole 43 has a portion corresponding to the 1 st outer diameter changing portion 12 of the 1 st pipe 10 and the outer peripheral surface in the vicinity thereof. The 1 st through hole 43 has a portion capable of covering at least a part of the portion of the tubular member 30 covering the 1 st pipe 10.

The 1 st opening 44 is an opening for inserting the 1 st tube 10 into the 1 st through hole 43. The 1 st opening 44 is disposed on the opposite side of the 1 st through hole 43 from the 2 nd trunk 50 side. The 1 st opening 44 has a 1 st guide portion 44a capable of guiding the 1 st portion 11 of the 1 st tube 10 to be inserted into the 1 st through hole 43. The 1 st guide portion 44a has a tapered surface inclined at a predetermined angle with respect to the extending direction (or the central axis CA direction) of the 1 st pipe 10.

The 1 st slit 45 is a slit-like portion that can be opened when the 1 st portion 11 of the 1 st tube 10 is inserted into the 1 st through hole 43 from the 1 st opening 44. The 1 st slit 45 is formed in the body 40a, the 1 st opening 44, the 1 st claw 42a, and the 1 st through hole 43. The length of the 1 st slit 45 is set in accordance with the material of the 1 st body 40, the size of the 1 st tube 10, and the like, but may be shortened for the purpose of increasing the strength.

The 1 st rotation suppressing portion 46 is a portion capable of suppressing the rotation of the 2 nd engaging portion 51 to suppress the relative rotation of the 1 st body 40 and the 2 nd body 50. The 1 st rotation suppressing portion 46 may be formed as a rib-like protruding portion. The 1 st rotation suppressing portion 46 may be provided on a peripheral portion of the 3 rd claw portion 42b of the outer surface of the main body 40 a.

The 1 st handle portion 47 is a portion (rod) protruding radially outward in the vicinity of an end portion on the opposite side of the 2 nd body 50 side on the outer peripheral surface of the body 40a of the 1 st body 40. The 1 st handle portion 47 and the 2 nd handle portion 57 are used together to easily engage and disengage the 1 st body 40 and the 2 nd body 50. The 1 st handle portion 47 is provided near the 1 st opening 44 side end of the outer surface of the 1 st body 40. The 1 st handle portion 47 and the 1 st claw portion 42a are alternately arranged in the circumferential direction. The 1 st handle portion 47 may have 2 (a pair of) handle portions, and may be disposed at a position rotated 180 degrees from one direction to the other around the center axis CA.

The 1 st protection portion 48 is a portion configured to partially cover the tubular member 30. The 1 st protector 48 extends from the end of the body 40a of the 1 st torso 40 along the outer surface of the tubular member 30 in the same direction as the central axis CA. The 1 st protection portion 48 is configured not to interfere with the 2 nd protection portion 58. The 1 st guard portion 48 is provided to avoid exposure of the tubular member 30 together with the 2 nd guard portion 58.

The 2 nd body 50 is a female structure (connector) through which the 2 nd tube 20 is inserted and attached to the 2 nd tube 20. The 2 nd body 50 may have the same structure (configuration) as the 1 st body 40. As for the 2 nd body 50, a material capable of elastic deformation, for example, glass fiber reinforcement POM (Polyoxymethylene), PA12GF (Polyamide 12 glass fiber) or the like can be used as in the 1 st body 40. In order to secure strength, the 2 nd body 50 may have a thicker wall thickness in a part of the main body 50a (for example, in the root portion of the 2 nd engaging portion 51). The 2 nd body 50 is configured to be engageable with the 1 st body 40. The 2 nd body 50 is configured to seal between the 2 nd tube 20 and the tubular member 30 via the 2 nd seal member 70 when engaged with the 1 st body 40. The 2 nd body 50 has, as main components, a 2 nd engaging portion 51, a 2 nd engaged portion 52, a 2 nd through hole 53, a 2 nd opening portion 54, a 2 nd slit 55, a 2 nd rotation suppressing portion 56, a 2 nd handle portion 57, and a 2 nd protecting portion 58. The respective constituent parts 51 to 58 are integrally formed with the main body 50a of the 2 nd body 50. The 2 nd body 50 is configured to have a substantially V-shape, a U-shape, or a Y-shape when viewed from a predetermined direction.

The 2 nd engaging portion 51 is a portion (arm) that can be engaged with the 1 st engaged portion 42 of the corresponding 1 st torso 40. The 2 nd engaging portion 51 is formed in a substantially arm shape (may be fork-shaped or rod-shaped) extending from the outer surface of the main body 50a of the 2 nd body 50 toward the outer surface of the main body 40a of the 1 st body 40 in the central axis CA direction. The 2 nd engaging portion 51 may be constituted by having 2 (a pair) opposing each other across a space as shown in the figure, but 1 or more engaging portions may be used. The 2 nd engaging portion 51 may be disposed at a position rotated by 90 degrees from the 2 nd engaged portion 52 about the central axis CA. The 2 nd engaging portion 51 may be set to be disposed at a position rotated by 90 degrees from the 1 st engaging portion 41 about the central axis CA when the 1 st body 40 and the 2 nd body 50 are engaged. The 2 nd engaging portion 51 is separated from the tubular member 30 when the 1 st body 40 is engaged with the 2 nd body 50. The 2 nd engaging portion 51 is configured to be elastically deformable. The 2 nd engagement portion 51 is slidable in the 1 st rotation suppressing portion 46 along the central axis CA, and rotation about the central axis CA is suppressed by the 1 st rotation suppressing portion 46. The 2 nd engaging portion 51 has a 2 nd window portion 51a, a 2 nd slot portion 51b, a 2 nd protrusion portion 51c, and a 2 nd tab portion 51d.

The 2 nd window 51a is a window-shaped portion that can be engaged with the 1 st claw 42a of the 1 st body 40. The 2 nd window portion 51a is formed on the front end side of the 2 nd engaging portion 51 than the 2 nd slot portion 51 b. The 2 nd window 51a has a 2 nd fin 51d protruding from the wall surface on the distal end side toward the root side.

The 2 nd slot portion 51b is a slot-like portion that is slidably engaged with the 3 rd claw portion 42b of the 1 st body 40 within a predetermined length along the extending direction of the 2 nd engagement portion 51. The 2 nd slot portion 51b is formed on the root side of the 2 nd window portion 51a in the 2 nd engaging portion 51. The 2 nd slot portion 51b and the 3 rd claw portion 42b are temporarily engaged with each other before the 2 nd window portion 51a and the 1 st claw portion 42a are engaged with each other in the assembling step.

The 2 nd projection 51c is a portion projecting from the distal end portion of the 2 nd engaging portion 51. The 2 nd protrusion 51c is configured such that, when the 3 rd click portion 42b is temporarily engaged with the 2 nd socket portion 51b and the 1 st click portion 42a is not engaged with the 2 nd window portion 51a, the 2 nd protrusion 51c is inserted into the 1 st slit 45 of the 1 st click portion 42a, and when the 2 nd protrusion 51c is pushed radially inward in this state, the 1 st slit 45 is opened, whereby the 1 st portion 11 of the 1 st tube 10 can be inserted into the 1 st through hole 43 from the 1 st opening 44.

The 2 nd tab portion 51d is a claw-like portion that is inserted into the 1 st slit 45 of the 1 st claw portion 42a when the 2 nd window portion 51a is engaged with the 1 st claw portion 42 a.

The 2 nd engaged portion 52 is a portion that can be engaged with the 1 st engaging portion 41 of the corresponding 1 st body 40. The 2 nd engaged portions 52 and the 2 nd engaged portions 51 are alternately arranged in the circumferential direction. The number of the 2 nd engaged portions 52 is 2 in the drawing, but 1 or more may be used. The 2 nd engaged portion 52 includes a 2 nd claw portion 52a and a 4 th claw portion 52b provided on the outer surface of the body 50a of the 2 nd body 50. The 2 nd pawl 52a is a pawl-like portion that can engage with the 1 st window 41 a. The 4 th claw portion 52b is a claw-like portion that is slidably engaged with the 1 st slot portion 41b in a predetermined length range along the extending direction of the 1 st engagement portion 41. The 2 nd claw portion 52a is disposed on the 2 nd tube 20 side of the 4 th claw portion 52b.

The 2 nd through hole 53 is a through hole through which the 2 nd pipe 20 can be inserted. The inner peripheral surface of the 2 nd through hole 53 has a portion corresponding to the 2 nd outer diameter varying portion 22 of the 2 nd pipe 20 and the outer peripheral surface in the vicinity thereof. The 2 nd through hole 53 has a portion capable of covering at least a part of the portion of the tubular member 30 that can cover the 2 nd pipe 20.

The 2 nd opening 54 is an opening for inserting the 2 nd pipe 20 into the 2 nd through hole 53. The 2 nd opening 54 is disposed on the opposite side of the 2 nd through hole 53 from the 1 st trunk 40 side. The 2 nd opening 54 has a 2 nd guide 54a capable of guiding insertion of the 3 rd portion 21 of the 2 nd pipe 20 into the 2 nd through hole 53. The 2 nd guide portion 54a has a tapered surface inclined at a predetermined angle with respect to the extending direction (or the central axis CA direction) of the 2 nd pipe 20.

The 2 nd slit 55 is a slit-like portion that can be opened when the 3 rd portion 21 of the 2 nd pipe 20 is inserted from the 2 nd opening 54 into the 2 nd through hole 53. The 2 nd slit 55 is formed in the body 50a, the 2 nd opening 54, the 2 nd claw 52a, and the 2 nd through hole 53. The length of the 2 nd slit 55 is set according to the material of the 2 nd body 50, the size of the 2 nd tube 20, and the like, but may be shortened for strength improvement.

The 2 nd rotation suppressing portion 56 is a portion capable of suppressing the rotation of the 1 st engaging portion 41 to suppress the relative rotation of the 1 st body 40 and the 2 nd body 50. The 2 nd rotation suppressing portion 56 may be a rib-like protruding portion. The 2 nd rotation suppressing portion 56 may be provided on a peripheral portion of the 4 th claw portion 52b of the outer surface of the main body 50 a.

The 2 nd handle 57 is a portion (rod) protruding radially outward in the vicinity of the end portion on the opposite side of the 1 st torso 40 side on the outer peripheral surface of the body 50a of the 2 nd torso 50. The 2 nd handle portion 57 is used together with the 1 st handle portion 47 to easily engage or disengage the 1 st body 40 and the 2 nd body 50. The 2 nd handle portion 57 is provided near the end portion on the 2 nd opening 54 side of the outer surface of the 2 nd trunk 50. The 2 nd handle portion 57 and the 2 nd claw portion 52a are alternately arranged in the circumferential direction. The 2 nd handle portion 57 may have 2 (a pair of) handle portions so as to be disposed at positions rotated 180 degrees from one direction to the other around the center axis CA.

The 2 nd protector 58 is a portion that extends from the 1 st body 40 side end of the main body 50a of the 2 nd body 50 toward the 1 st body 40 so as to partially cover the tubular member 30 without abutting against the 1 st protector 48. The 2 nd protector 58 is for avoiding the exposure of the tubular member 30 together with the 1 st protector 48.

The 1 st seal member 60 is a member capable of sealing between the tubular member 30 and the 1 st tube 10. The 1 st seal member 60 can be supported by the 1 st step portion 31 provided near one end of the inner peripheral surface of the tubular member 30. When the 1 st body 40 and the 2 nd body 50 are engaged with each other, the 1 st portion 11 of the 1 st tube 10 is inserted into the 1 st seal member 60 in the radial direction and pushed toward the 2 nd tube 20, and the tubular member 30 and the 1 st tube 10 can be sealed. The 1 st seal member 60 may have the same structure (configuration) as the 2 nd seal member 70. An O-ring may be used for example in the 1 st seal member 60. As the material of the 1 st seal member 60, for example, HNBR (Hydrogenated Acrylonitrile Butadiene Rubber) can be used.

The 2 nd sealing member 70 is a member capable of sealing between the tubular member 30 and the 2 nd pipe 20. The 2 nd seal member 70 can be supported by the 2 nd step portion 32 provided near the other end of the inner peripheral surface of the tubular member 30. When the 1 st body 40 engages with the 2 nd body 50, the 3 rd portion 21 of the 2 nd tube 20 is inserted into the 2 nd seal member 70 in the radial direction and pushed toward the 1 st tube 10 side, so that the tubular member 30 and the 2 nd tube 20 can be sealed. The 2 nd seal member 70 may have the same structure (configuration) as the 1 st seal member 60. An O-ring may be used for example in the 2 nd seal member 70. As the material of the 2 nd seal member 70, HNBR (Hydrogenated Acrylonitrile Butadiene Rubber) can be used, for example.

A pipe connection method using the pipe joint according to embodiment 1 will be described with reference to the drawings. Fig. 5 is a perspective view schematically showing a state before the 1 st pipe and the 2 nd pipe are inserted when the pipe joint according to embodiment 1 is temporarily engaged. Fig. 6 is a perspective view schematically showing a state immediately after the 1 st pipe and the 2 nd pipe are inserted when the pipe joint according to embodiment 1 is temporarily engaged. For the portions not shown in fig. 5 and 6, reference is made to fig. 1 to 4.

First, the 1 st seal member 60 is attached to the 1 st step portion 31 of the tubular member 30, and the 2 nd seal member 70 is attached to the 2 nd step portion 32 (step A1; refer to fig. 1, 3).

Next, the 1 st body 40 and the 2 nd body 50 are assembled so that the tubular member 30 is partially accommodated in the 1 st through hole 43 of the 1 st body 40 and the 2 nd through hole 53 of the 2 nd body 50 (step A2; see fig. 1 and 3). At this time, the 1 st body 40 and the 2 nd body 50 are temporarily engaged and disengaged.

Next, the 1 st body 40 and the 2 nd body 50 are slid so as to approach each other, the 4 th claw portion 52b is temporarily engaged with the 1 st slot portion 41b, and the 3 rd claw portion 42b is temporarily engaged with the 2 nd slot portion 51b (step A3; see fig. 5 and 3). At this time, the 1 st body 40 and the 2 nd body 50 are temporarily engaged but are not completely engaged.

Next, the 1 st projection 41c is pushed radially inward, the 2 nd slit 55 is opened, the 3 rd portion 21 of the 2 nd tube 20 is inserted into the 2 nd through hole 53 from the 2 nd opening 54, and the other end is inserted into the tubular member 30 (step A4; see fig. 6 and 3). At this time, the 1 st body 40 and the 2 nd body 50 are temporarily engaged but are not completely engaged.

Next, the 2 nd protrusion 51c is pushed inward in the radial direction, the 1 st slit 45 is opened, the 1 st portion 11 of the 1 st tube 10 is inserted into the 1 st through hole 43 from the 1 st opening 44, and is inserted into the tubular member 30 from one end (step A5; see fig. 6 and 3). At this time, the 1 st body 40 and the 2 nd body 50 are temporarily engaged but are not completely engaged. Step A5 may be performed before step A4.

Next, the 1 st body 40 and the 2 nd body 50 are slid further so as to approach each other, the 1 st claw portion 42a is engaged with the 2 nd window portion 51a, and the 2 nd claw portion 52a is engaged with the 1 st window portion 41a (step A6; see fig. 2 and 3), and the operation is completed. Thus, the 1 st tube 10 and the tubular member 30 are sealed with each other by the 1 st seal member 60, and the 2 nd tube 20 and the tubular member 30 are sealed with each other by the 2 nd seal member 70, so that the 1 st tube 10 and the 2 nd tube 20 are tightly connected to each other. At this time, the 1 st body 40 and the 2 nd body 50 are temporarily engaged and completely engaged.

In the case of separating the 1 st pipe 10 from the 2 nd pipe 20, the pipe connection method may be performed in reverse order.

According to embodiment 1, since it is not necessary to pay attention to the correspondence between the 1 st tube 10 and the 2 nd tube 20 and the 1 st body 40 and the 2 nd body 50, human error is not generated any more, and the assembly can be simplified. Further, since the 1 st body 40 and the 2 nd body 50 can be made to have the same structure and the 1 st seal member 60 and the 2 nd seal member 70 can be made to have the same structure, the manufacturing load can be reduced. Further, the 1 st body 40 and the 2 nd body 50 can be easily engaged by sliding, and thus can be easily handled.

Further, since brazing or welding is not required for connecting the 1 st pipe 10 and the 2 nd pipe 20, a highly difficult task of a professional is not required, and the task can be easily performed regardless of the person. Further, the quality of the seal is stabilized by sealing with the 1 st seal member 60 and the 2 nd seal member 70. When the 1 st pipe 10 and the 2 nd pipe 20 are connected, maintenance is not required around them, and the manufacturing load can be reduced. Further, even if the 1 st pipe 10 and the 2 nd pipe 20 are made of different materials (for example, aluminum and copper), they can be connected without direct contact, and thus can be connected without galvanic corrosion. Further, since the 1 st pipe 10 and the 2 nd pipe 20 can be rotated even after connection, layout is easy.

Further, the 1 st body 40 and the 2 nd body 50 can be disengaged from each other, and the 1 st pipe 10 and the 2 nd pipe 20 can be attached and detached, so that maintenance is easy. In addition, compared with the current flare nut method, the working hours are reduced, and the quality of leakage is stable.

Further, by making the 1 st body 40 and the 2 nd body 50 have the same structure, only 1 frame common to the 1 st body 40 and the 2 nd body 50 may be prepared, and when a 3D printer is used, only 1 data may be prepared, so that the manufacturing load can be reduced.

Embodiment 2

The pipe joint according to embodiment 2 will be described with reference to the drawings. Fig. 7 is a cross-sectional view schematically showing the structure of the body 2 and the tubular member of the pipe joint according to embodiment 2, when the pipe joint is cut in the Y direction so as to pass through the central axis CA.

Embodiment 2 is a modification of embodiment 1, and has the following structure: the 2 nd pressing portion 53a (the same applies to the portion corresponding to the 1 st through hole 43 of the 1 st body 40 in fig. 3) is provided in the 2 nd through hole 53 of the 2 nd body 50, and the 1 st step portion (corresponding to 31 in fig. 3) and the 2 nd step portion (corresponding to 32 in fig. 3) are removed from the tubular member 80, so that the 1 st seal member (corresponding to 60 in fig. 3) and the 2 nd seal member (corresponding to 70 in fig. 3) are not used.

The 2 nd through hole 53 has a 2 nd pressing portion 53a, and when the 1 st body (corresponding to 40 in fig. 3) and the 2 nd body 50 are engaged, the 2 nd pressing portion 53a presses the tubular member 80 radially inward, so that the 3 rd portion (corresponding to 21 in fig. 3) of the tubular member 80 and the 2 nd tube (corresponding to 20 in fig. 3) can be kept in a closely-adhered state. The 2 nd pressing portion 53a is a conical surface (conical surface of L1< L2 as shown in fig. 7) that presses the tubular member 80 radially inward over the entire circumference when the 1 st body (corresponding to 40 in fig. 3) is engaged with the 2 nd body 50. The 2 nd pressing portion 53a is configured to cover at least a part of a portion of the tubular member 80 covering the 2 nd tube (corresponding to 20 in fig. 3).

The 1 st through hole (corresponding to 43 in fig. 3) also has a 1 st pressing portion (not shown) that presses the tubular member 80 radially inward when the 1 st body (corresponding to 40 in fig. 3) is engaged with the 2 nd body 50, as in the 2 nd through hole 53, so that the 1 st portion (corresponding to 11 in fig. 3) of the tubular member 80 and the 1 st tube (corresponding to 10 in fig. 3) can be kept in a close contact state. The 1 st pressing portion (not shown) is a conical surface that presses the tubular member 80 radially inward over the entire circumference when the 1 st body (corresponding to 40 in fig. 3) engages with the 2 nd body 50, as in the 2 nd pressing portion 53 a. The 1 st pressing portion (not shown) is configured to cover at least a part of a portion of the tubular member 80 covering the 1 st tube (corresponding to 10 in fig. 3) in the same manner as the 2 nd pressing portion 53 a.

In the tubular member 80, a material that is more easily elastically deformable than the material of the 2 nd body 50, for example, NBR (Acrylonitrile Butadiene Rubber) can be used. The bushing portion (corresponding to 33 in fig. 3) can be made not to be formed in the tubular member 80. When the 1 st body (corresponding to 40 in fig. 3) is engaged with the 2 nd body 50, the tubular member 80 is directly pressure-bonded to the 1 st tube (corresponding to 10 in fig. 3) to form a seal. When the 1 st body (corresponding to 40 in fig. 3) is engaged with the 2 nd body 50, the tubular member 80 is directly pressure-bonded to the 2 nd tube (corresponding to 20 in fig. 3) to form a sealed state.

Other structures, pipe connection methods, and the like are the same as those of embodiment 1.

According to embodiment 2, the manufacturing load can be reduced and the assembly can be simplified as in embodiment 1, and furthermore, since the sealing member (corresponding to 60 and 70 in fig. 3) is not used, the number of parts used for the pipe joint can be reduced as compared with embodiment 1, and the assembly can be simplified.

(appendix)

In the present invention, the pipe joint according to claim 1 can be formed.

In the pipe joint pertaining to claim 1, the 1 st engaging portions and the 1 st engaged portions are alternately arranged in the circumferential direction; the 2 nd engaging portions and the 2 nd engaged portions are alternately arranged in the circumferential direction.

In the pipe joint according to the 1 st aspect, the 1 st body includes 2 1 st engaging portions and 2 1 st engaged portions; the 2 nd body has 2 the 2 nd engaging portions and 2 the 2 nd engaged portions.

In the pipe joint according to claim 1, the 1 st engagement portion is configured to extend from an outer surface of the 1 st body toward an outer surface of the 2 nd body; the 2 nd engaging portion is configured to extend from an outer surface of the 2 nd body toward an outer surface of the 1 st body; the 1 st engaged portion is provided on an outer surface of the 1 st body main body; the 2 nd engaged portion is provided on an outer surface of the body of the 2 nd body.

In the pipe joint pertaining to claim 1, the 1 st engaged portion has a 1 st claw portion; the 2 nd engaged part is provided with a 2 nd claw part; the 1 st engaging portion has a 1 st window portion engageable with the 2 nd claw portion; the 2 nd engaging portion has a 2 nd window portion engageable with the 1 st claw portion.

In the pipe joint pertaining to claim 1, the 1 st engaged portion further comprises a 3 rd claw portion; the 2 nd engaged part also has a 4 th claw part; the 1 st engaging portion has a 1 st slot portion which is slidably engaged with the 4 th claw portion in a predetermined length range along an extending direction of the 1 st engaging portion; the 2 nd engaging portion has a 2 nd slot portion which is slidably engaged with the 3 rd pawl portion in a predetermined length range along an extending direction of the 2 nd engaging portion; the 3 rd claw part and the 2 nd slot part are temporarily engaged with each other earlier than the 1 st claw part and the 2 nd window part are engaged with each other in the assembling process; the temporary engagement between the 4 th claw portion and the 1 st slot portion is performed earlier than the engagement between the 2 nd claw portion and the 1 st window portion in the assembling process.

In the pipe joint pertaining to claim 1, the 1 st pipe has a 1 st portion having a predetermined length from an end face facing the 2 nd pipe, a 2 nd portion having a smaller outer diameter than the 1 st portion, and a 1 st outer diameter changing portion having a smaller outer diameter from the 1 st portion toward the 2 nd portion; the 2 nd pipe has a 3 rd part having a predetermined length from an end surface facing the 1 st pipe, a 4 th part having a smaller outer diameter than the 3 rd part, and a 2 nd outer diameter changing part having a smaller outer diameter from the 3 rd part toward the 4 th part; the inner peripheral surface of the 1 st through hole has a portion corresponding to the 1 st outer diameter changing portion and the outer peripheral surface in the vicinity thereof; the inner peripheral surface of the 2 nd through hole has a portion corresponding to the 2 nd outer diameter changing portion and the outer peripheral surface in the vicinity thereof; the 1 st body has a 1 st opening portion located on the opposite side of the 1 st through hole from the 2 nd body side, and at least 1 st slit openable when the 1 st portion of the 1 st tube is inserted from the 1 st opening portion into the 1 st through hole; the 2 nd body has a 2 nd opening portion located on the opposite side of the 2 nd through hole from the 1 st body side, and at least 1 2 nd slit openable when the 3 rd portion of the 2 nd tube is inserted into the 2 nd through hole from the 2 nd opening portion.

In the pipe joint pertaining to claim 1, the 1 st engaging portion has a 1 st projecting portion at a distal end portion; the 2 nd engaging portion has a 2 nd protruding portion at a front end portion; the 1 st slit is also formed in the 1 st claw portion; the 2 nd slit is also formed on the 2 nd claw portion; the 1 st projection is configured to be in a state in which the 1 st projection is inserted into the 2 nd slit of the 2 nd claw when the 4 th claw is temporarily engaged with the 1 st slot and the 2 nd claw is not engaged with the 1 st window, and to be capable of inserting the 3 rd portion of the 2 nd tube from the 2 nd opening into the 2 nd through hole by opening the 2 nd slit when the 1 st projection is pushed radially inward in this state; the 2 nd protrusion is configured to be in a state in which the 2 nd protrusion is inserted into the 1 st slit of the 1 st jaw when the 3 rd jaw is temporarily engaged with the 2 nd slot and the 1 st jaw is not engaged with the 2 nd window, and to be capable of opening the 1 st slit and inserting the 1 st portion of the 1 st tube from the 1 st opening into the 1 st through hole when the 2 nd protrusion is pushed radially inward in this state.

In the pipe joint according to claim 1, the 1 st window portion includes a 1 st fin portion that is inserted into the 2 nd slit of the 2 nd claw portion when engaged with the 2 nd claw portion; the 2 nd window portion has a 2 nd tab portion that is inserted into the 1 st slit of the 1 st tab portion when engaged with the 1 st tab portion.

In the pipe joint according to claim 1, the 1 st opening portion includes a 1 st guide portion capable of guiding insertion of the 1 st portion of the 1 st pipe into the 1 st through hole; the 2 nd opening portion has a 2 nd guide portion capable of guiding insertion of the 3 rd portion of the 2 nd pipe into the 2 nd through hole.

In the pipe joint according to claim 1, the 1 st guide portion and the 2 nd guide portion are tapered surfaces inclined at a predetermined angle with respect to the extending directions of the 1 st pipe and the 2 nd pipe.

In the pipe joint pertaining to claim 1, the 1 st body has a 1 st rotation suppressing portion that can suppress rotation of the 2 nd engaging portion to suppress relative rotation between the 1 st body and the 2 nd body; the 2 nd body has a 2 nd rotation suppressing portion capable of suppressing rotation of the 1 st engaging portion to suppress relative rotation between the 1 st body and the 2 nd body.

In the pipe joint according to claim 1, the 1 st body and the 2 nd body have the same structure.

In the pipe joint pertaining to the above-described item 1, the above-described tubular member is elastically deformable; the 1 st through hole has a 1 st pressing portion for pressing the tubular member inward when the 1 st body and the 2 nd body are engaged, so that the tubular member and the 1 st pipe can be kept in close contact with each other; the 2 nd through hole has a 2 nd pressing portion that presses the tubular member inward when the 1 st body and the 2 nd body are engaged, and can keep the tubular member and the 2 nd pipe in a state of close contact.

In the pipe joint according to claim 1, the 1 st pressing portion is a conical surface that presses the tubular member radially inward over the entire circumference when the 1 st body is engaged with the 2 nd body; the 2 nd pressing portion is a conical surface that presses the tubular member radially inward over the entire circumference when the 1 st body is engaged with the 2 nd body.

The pipe joint according to the above-mentioned claim 1 further comprises: a 1 st seal member which is supported by the tubular member in the vicinity of the one end of the inner peripheral surface of the tubular member; a 2 nd seal member supported by the tubular member in the vicinity of the other end of the inner peripheral surface of the tubular member; when the 1 st body is engaged with the 2 nd body, the 1 st portion of the 1 st tube is inserted into the 1 st seal member in a radial direction and pushed toward the 2 nd tube side, so that the tubular member and the 1 st tube can be sealed; when the 1 st body is engaged with the 2 nd body, the 3 rd portion of the 2 nd tube is inserted into the 2 nd sealing member in the radial direction and pushed toward the 1 st tube side, so that the tubular member and the 2 nd tube can be sealed.

In the pipe joint pertaining to claim 1, the 1 st seal member and the 2 nd seal member have the same structure.

In the pipe joint according to claim 1, the tubular member has a sleeve portion protruding from an inner peripheral surface.

In the pipe joint according to claim 1, the 1 st body has at least 1 st handle portion formed so as to protrude radially outward in the vicinity of an end portion of the outer peripheral surface on the opposite side of the 2 nd body side; the 2 nd body has at least 1 2 nd handle portion formed to protrude radially outward in the vicinity of an end portion of the outer peripheral surface on the opposite side of the 1 st body side.

In the pipe joint according to claim 1, the 1 st body has at least 1 st protection portion, and the 1 st protection portion is configured to extend from the 2 nd body side end portion toward the 2 nd body so as to partially cover the tubular member; the 2 nd body has at least 1 2 nd protection portion, and the 2 nd protection portion is configured to extend from the 1 st body side end portion toward the 1 st body so as to partially cover the tubular member without abutting the 1 st protection portion.

In the present invention, the pipe connection method according to claim 2 can be configured.

The pipe connection method according to claim 3, further comprising: a step of assembling the 1 st body and the 2 nd body so as to accommodate the tubular member in the 1 st through hole and the 2 nd through hole; a step of temporarily engaging the 4 th claw portion with the 1 st slot portion and temporarily engaging the 3 rd claw portion with the 2 nd slot portion; a step of pushing the 1 st projection inward in the radial direction, opening the 2 nd slit, and inserting the 3 rd part of the 2 nd tube from the 2 nd opening into the 2 nd through hole and from the other end into the tubular member; a step of inserting the 1 st part of the 1 st tube into the 1 st through hole from one end by pushing the 2 nd protrusion radially inward and opening the 1 st slit; and a step of sealing between the 1 st pipe and the tubular member and between the 2 nd pipe and the tubular member by engaging the 1 st claw portion with the 2 nd window portion and engaging the 2 nd claw portion with the 1 st window portion.

The disclosures of the above patent documents are incorporated into the present specification by reference. Within the framework of the entire disclosure of the present invention (including claims and drawings), it is also possible to make modifications and adjustments of the embodiments or examples based on the basic technical ideas thereof. Further, within the framework of the entire disclosure of the present invention, various combinations or selections of various disclosed elements (including elements of the claims, elements of the embodiments or examples, elements of the drawings, and the like) can be made (not selected as needed). That is, the present invention naturally includes various modifications and corrections that can be made by those skilled in the art in accordance with the entire disclosure including the claims and drawings and technical ideas. The numerical values and numerical ranges described in the present application may be regarded as any intermediate values, lower values, and small ranges thereof unless otherwise stated.

Claims

1. A pipe joint, characterized by comprising: a tubular member that partially covers a 1 st tube inserted from one end and partially covers a 2 nd tube inserted from the other end opposite to the one end; a 1 st body having a 1 st through hole capable of covering at least a part of a portion of the tubular member covering the 1 st pipe; and a 2 nd body having a 2 nd through hole capable of covering at least a part of a portion of the tubular member covering the 2 nd pipe, the 1 st body and the 2 nd body being capable of being engaged with each other, the 1 st body having at least 1 st engaging portion capable of engaging with the 2 nd body, the 1 st body having at least 1 st engaged portion capable of engaging with the corresponding 2 nd engaging portion, the 1 st body having at least 1 st engaged portion capable of engaging with the 2 nd body when the 1 st body is engaged with the 2 nd body, and the 2 nd body being sealed between the 1 st pipe and the tubular member and between the 2 nd pipe and the tubular member, respectively, the 2 nd body has at least 1 2 nd engaged portions engageable with the corresponding 1 st engaging portions, the 1 st engaged portion has a 1 st claw portion, the 2 nd engaged portion has a 2 nd claw portion, the 1 st engaged portion further has a 3 rd claw portion, the 2 nd engaged portion further has a 4 th claw portion, the 1 st engaging portion has a 1 st slot portion slidably engaged with the 4 nd claw portion in a predetermined length range along an extending direction of the 1 st engaging portion, the 2 nd engaging portion has a 2 nd slot portion slidably engaged with the 3 rd claw portion in a predetermined length range along the extending direction of the 2 nd engaging portion, and the 1 st engaging portion has a 1 st window portion engageable with the 2 nd claw portion; the 2 nd engaging portion has a 2 nd window portion engageable with the 1 st claw portion; the 3 rd pawl portion and the 2 nd slot portion are temporarily engaged with each other in the assembling step, and the 4 th pawl portion and the 1 st slot portion are temporarily engaged with each other in the assembling step, respectively, in the 2 nd pawl portion and the 1 st window portion, respectively.

2. The pipe joint according to claim 1, wherein the 1 st engaging portion and the 1 st engaged portion are alternately arranged in a circumferential direction; the 2 nd engaging portions and the 2 nd engaged portions are alternately arranged in the circumferential direction.

3. The pipe joint according to claim 2, wherein the 1 st body has 2 1 st engaging portions and 2 1 st engaged portions; the 2 nd body has 2 the 2 nd engaging portions and 2 the 2 nd engaged portions.

4. A pipe joint according to claim 2 or 3, wherein the 1 st engagement portion is configured to extend from an outer surface of the 1 st body toward an outer surface of the 2 nd body; the 2 nd engaging portion is configured to extend from an outer surface of the 2 nd body toward an outer surface of the 1 st body; the 1 st engaged portion is provided on an outer surface of the 1 st body main body; the 2 nd engaged portion is provided on an outer surface of the body of the 2 nd body.

5. The pipe joint according to claim 1, wherein the 1 st pipe has a 1 st portion having a predetermined length from an end surface facing the 2 nd pipe, a 2 nd portion having an outer diameter smaller than the 1 st portion, and a 1 st outer diameter changing portion having an outer diameter smaller from the 1 st portion toward the 2 nd portion; the 2 nd pipe has a 3 rd part having a predetermined length from an end surface facing the 1 st pipe, a 4 th part having a smaller outer diameter than the 3 rd part, and a 2 nd outer diameter changing part having a smaller outer diameter from the 3 rd part toward the 4 th part; the inner peripheral surface of the 1 st through hole has a portion corresponding to the 1 st outer diameter changing portion and the outer peripheral surface in the vicinity thereof; the inner peripheral surface of the 2 nd through hole has a portion corresponding to the 2 nd outer diameter changing portion and the outer peripheral surface in the vicinity thereof; the 1 st body has a 1 st opening portion located on the opposite side of the 1 st through hole from the 2 nd body side, and at least 1 st slit openable when the 1 st portion of the 1 st tube is inserted from the 1 st opening portion into the 1 st through hole; the 2 nd body has a 2 nd opening portion located on the opposite side of the 2 nd through hole from the 1 st body side, and at least 1 2 nd slit openable when the 3 rd portion of the 2 nd tube is inserted into the 2 nd through hole from the 2 nd opening portion.

6. The pipe joint according to claim 5, wherein the 1 st engaging portion has a 1 st projecting portion at a front end portion; the 2 nd engaging portion has a 2 nd protruding portion at a front end portion; the 1 st slit is also formed in the 1 st claw portion; the 2 nd slit is also formed on the 2 nd claw portion; the 1 st projection is configured to be in a state in which the 1 st projection is inserted into the 2 nd slit of the 2 nd claw when the 4 th claw is temporarily engaged with the 1 st slot and the 2 nd claw is not engaged with the 1 st window, and to be capable of inserting the 3 rd portion of the 2 nd tube from the 2 nd opening into the 2 nd through hole by opening the 2 nd slit when the 1 st projection is pushed into the inside in this state; the 2 nd protrusion is configured to be in a state in which the 2 nd protrusion is inserted into the 1 st slit of the 1 st jaw when the 3 rd jaw is temporarily engaged with the 2 nd slot and the 1 st jaw is not engaged with the 2 nd window, and to be capable of inserting the 1 st portion of the 1 st tube from the 1 st opening into the 1 st through hole by opening the 1 st slit when the 2 nd protrusion is pushed inward in this state.

7. The pipe joint according to claim 6, wherein the 1 st window portion has a 1 st fin portion inserted into the 2 nd slit of the 2 nd claw portion when engaged with the 2 nd claw portion; the 2 nd window portion has a 2 nd tab portion that is inserted into the 1 st slit of the 1 st tab portion when engaged with the 1 st tab portion.

8. The pipe joint according to any one of claims 5 to 7, wherein the 1 st opening portion has a 1 st guide portion capable of guiding insertion of the 1 st portion of the 1 st pipe into the 1 st through hole; the 2 nd opening portion has a 2 nd guide portion capable of guiding insertion of the 3 rd portion of the 2 nd pipe into the 2 nd through hole.

9. The pipe joint according to claim 8, wherein the 1 st guide portion and the 2 nd guide portion are tapered surfaces inclined at a predetermined angle with respect to the extending directions of the 1 st pipe and the 2 nd pipe, respectively.

10. The pipe joint according to claim 2 or 3, wherein the 1 st body has a 1 st rotation suppressing portion capable of suppressing rotation of the 2 nd engaging portion to suppress relative rotation between the 1 st body and the 2 nd body; the 2 nd body has a 2 nd rotation suppressing portion capable of suppressing rotation of the 1 st engaging portion to suppress relative rotation between the 1 st body and the 2 nd body.

11. A pipe joint according to any one of claims 1 to 3, wherein the 1 st body and the 2 nd body have the same structure.

12. A pipe joint according to any one of claims 1 to 3, wherein the tubular member is elastically deformable; the 1 st through hole has a 1 st pressing portion for pressing the tubular member inward when the 1 st body and the 2 nd body are engaged, so that the tubular member and the 1 st pipe can be kept in close contact with each other; the 2 nd through hole has a 2 nd pressing portion that presses the tubular member inward when the 1 st body and the 2 nd body are engaged, and can keep the tubular member and the 2 nd pipe in a state of close contact.

13. The pipe joint according to claim 12, wherein the 1 st pressing portion is a conical surface that presses the tubular member over the entire circumferential inner side when the 1 st body is engaged with the 2 nd body; the 2 nd pressing portion is a conical surface that presses the tubular member over the entire circumferential inner side when the 1 st body is engaged with the 2 nd body.

14. A pipe joint according to any one of claims 1 to 3, further comprising: a 1 st seal member which is supported by the tubular member in the vicinity of the one end of the inner peripheral surface of the tubular member; and a 2 nd seal member supported by the tubular member in the vicinity of the other end of the inner peripheral surface of the tubular member; when the 1 st body is engaged with the 2 nd body, the 1 st portion of the 1 st tube is inserted into the 1 st sealing member and pushed toward the 2 nd tube side, so that the tubular member and the 1 st tube can be sealed; when the 1 st body is engaged with the 2 nd body, the 3 rd portion of the 2 nd tube is inserted into the 2 nd sealing member and pushed toward the 1 st tube side, so that the tubular member and the 2 nd tube can be sealed.

15. The pipe joint according to claim 14, wherein the 1 st seal member and the 2 nd seal member have the same structure.

16. A pipe joint according to any one of claims 1 to 3, wherein the tubular member has a bush portion protruding from an inner peripheral surface.

17. The pipe joint according to any one of claims 1 to 3, wherein the 1 st body has at least 1 st handle portion formed so as to protrude outward in the vicinity of an end portion of the outer peripheral surface on the opposite side of the 2 nd body side; the 2 nd body has at least 1 2 nd handle portion formed so as to protrude outward in the vicinity of an end portion of the outer peripheral surface on the opposite side of the 1 st body side.

18. A pipe joint according to any one of claims 1 to 3, wherein the 1 st body has at least 1 st protection portion, and the 1 st protection portion is configured to extend from an end portion on the 2 nd body side toward the 2 nd body so as to partially cover the tubular member; the 2 nd body has at least 1 2 nd protection portion, the 2 nd protection portion is configured to extend from the 1 st body side end portion toward the 1 st body, to partially cover the tubular member without abutting the 1 st protection portion, the 1 st protection portion extends from the 1 st body side end portion of the 1 st body along an outer surface of the tubular member in the same direction as a central axis, and the 2 nd protection portion extends from the 1 st body side end portion of the 2 nd body toward the 1 st body.

19. A pipe connection method for connecting pipes using the pipe joint according to any one of claims 1 to 18, comprising: a step of assembling the 1 st body and the 2 nd body so as to accommodate the tubular member in the 1 st through hole and the 2 nd through hole; inserting a 1 st tube into the 1 st through hole from one end to the tubular member in a state where the 1 st body and the 2 nd body are assembled; inserting a 2 nd pipe into the 2 nd through hole from the other end to the tubular member in a state where the 1 st body and the 2 nd body are assembled; and a step of engaging the 1 st body with the 2 nd body to seal between the 1 st pipe and the tubular member and between the 2 nd pipe and the tubular member.

20. A pipe connection method for connecting pipes using the pipe joint according to claim 6 or 7, comprising: a step of assembling the 1 st body and the 2 nd body so as to accommodate the tubular member in the 1 st through hole and the 2 nd through hole; a step of temporarily engaging the 4 th claw portion with the 1 st slot portion and temporarily engaging the 3 rd claw portion with the 2 nd slot portion; a step of pushing in the 1 st projection, opening the 2 nd slit, inserting the 3 rd part of the 2 nd pipe from the 2 nd opening into the 2 nd through hole, and inserting the other end of the 3 rd pipe into the tubular member; a step of pushing in the 2 nd protrusion portion inward, opening the 1 st slit, and inserting the 1 st portion of the 1 st tube from one end into the 1 st through hole by inserting the 1 st portion of the 1 st tube from the 1 st opening portion; and a step of engaging the 1 st claw portion with the 2 nd window portion, engaging the 2 nd claw portion with the 1 st window portion, and sealing between the 1 st pipe and the tubular member and between the 2 nd pipe and the tubular member.