JP7341469B2 - Joint structure and how to assemble the joint structure - Google Patents

Description

The present invention relates to a joint structure and a method for assembling the joint structure.

Patent Document 1 describes a first joint member having a male thread formed on its outer periphery, a nut member screwed into the male thread, a second joint member inserted into the nut member, a first joint member and a second joint member. A joint structure is disclosed that includes a gasket provided therebetween and a retainer that holds the gasket.

Japanese Patent Application Publication No. 2018-17381

However, in the joint structure described in Patent Document 1, the annular projections for preventing excessive tightening are provided on the abutting end faces of the first joint member and the abutting end faces of the second joint member, so the structures of the first joint member and the second joint member are becomes complicated.

The present invention has been made in view of the above circumstances, and aims to provide a joint structure and a method for assembling the joint structure that can simplify the joint member and prevent excessive tightening of the gasket. purpose.

According to an aspect of the present invention, a first joint member having a first fluid flow path formed on an inner periphery and a male thread formed on an outer periphery; a nut member having a female thread screwed into the male thread; a second fluid flow path is formed in the second joint member, the end of which is locked in the nut member, and an interposed member between the abutting end face of the first joint member and the abutting end face of the second joint member. a first retainer attached to the outer peripheral surface of the first joint member or the second joint member; and a second retainer detachably attached to the first retainer; a holding means held by the first retainer and the second retainer, and a first retainer in which one of the first retainer and the second retainer abuts the abutted end surface of the first joint member. an abutment area; a first protrusion located inside the first abutment area and pressed against one end surface of the gasket; a second abutment area that either the retainer or the second retainer abuts; and a second protrusion that is located inside the second abutment area and is pressed against the other end surface of the gasket. A joint structure is provided in which the holding means is sandwiched between the first abutment area and the second abutment area.

According to the aspect of the present invention, excessive tightening of the gasket can be prevented while simplifying the joint member.

1 is a sectional view showing a joint structure according to an embodiment of the present invention. FIG. 3 is a front perspective view showing the retainer. FIG. 3 is a rear perspective view showing the retainer. It is a front view showing a retainer. FIG. 3 is a rear view of the retainer. It is a flowchart which shows the assembling method of the joint structure which assembles a joint structure.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention (hereinafter referred to as the present embodiment) will be described below with reference to the accompanying drawings. In this specification, the same elements are given the same reference numerals throughout.

First, a joint structure 1 according to the present embodiment will be described with reference to FIGS. 1 to 2D.

FIG. 1 is a sectional view showing a joint structure 1 according to this embodiment. In addition, in FIG. 1, a part of the 1st joint member 2 and the 2nd joint member 4 is abbreviate|omitted. FIG. 2A is a front perspective view showing the retainer 7. FIG. FIG. 2B is a rear perspective view showing the retainer 7. FIG. FIG. 2C is a front view showing the retainer 7. FIG. 2D is a rear view showing the retainer 7. In addition, in the drawings, the axial direction of the joint structure 1 is simply referred to as the axial direction, and the radial direction of the joint structure 1 is simply referred to as the radial direction.

The joint structure 1 according to this embodiment is used, for example, in a fluid supply unit to supply a process gas or a purge gas as a fluid. A fluid supply unit (not shown) is used as a means for supplying process gas and purge gas in semiconductor manufacturing equipment (CVD equipment, sputtering equipment, etching equipment, etc.).

As shown in FIG. 1, the joint structure 1 includes a first joint member 2, a nut member 3, a second joint member 4, a bearing 5, a gasket 6, and a retainer 7 as a holding means.

The first joint member 2 is a metal pipe member for supplying process gas or purge gas to the semiconductor manufacturing equipment, and is formed into a substantially cylindrical shape (specifically, a substantially cylindrical shape). The first joint member 2 includes a first fluid flow path 21 formed on the inner periphery, a stepped portion 22 as a holding portion formed on a part of the outer periphery, and a male thread 23 formed on another part of the outer periphery. and has.

One end of the first fluid flow path 21 opens at the abutting end surface 24 of the first joint member 2 . Process gas or purge gas is supplied to the semiconductor manufacturing equipment through the first fluid flow path 21 .

The stepped portion 22 is formed in a cylindrical shape (specifically, a cylindrical shape) and is a holding portion for holding a first held portion 711 in a first retainer 71 of the retainer 7, which will be described later. The stepped portion 22 extends in the axial direction from the abutting end surface 24 on the outer periphery of the first joint member 2 . The male thread 23 is a male thread for screwing into a female thread 33 of the nut member 3, which will be described later. The male thread 23 is formed so as not to interfere with the stepped portion 22.

A first contact area 25 and a first protrusion 26 are provided on an annular (specifically annular) abutting end surface 24 of the first joint member 2 that faces one end surface of the gasket 6 . The first protrusion 26 is located inside the first contact area 25 in the radial direction.

The first contact area 25 is a flat surface for contacting a first holding part 712 of the first retainer 71 of the retainer 7, which will be described later. The first contact area 25 is formed in an annular shape (specifically, an annular shape) on the outer peripheral edge of the abutting end surface 24 .

The first protrusion 26 is pressed against one end surface of the gasket 6. The first protrusion 26 is formed in an annular shape (specifically, an annular shape) so as to protrude from the abutting end surface 24 . Further, the first protrusion 26 is tapered toward its tip.

The nut member 3 is a metal cap nut for accommodating the end of the first joint member 2 and the end of the second joint member 4. The nut member 3 is formed into a substantially bottomed cylindrical shape (specifically, a substantially bottomed cylindrical shape). A through hole 32 is formed in the bottom surface portion 31 of the nut member 3 . The second joint member 4 is inserted into the through hole 32 . A female thread 33 that is screwed into the male thread 23 of the first joint member 2 is formed on the inner periphery of the nut member 3 on the distal end side.

Like the first joint member 2, the second joint member 4 is a metal pipe member for supplying process gas or purge gas to semiconductor manufacturing equipment, and has a substantially cylindrical shape (specifically, a substantially cylindrical shape). is formed. The end of the second joint member 4 is locked to the nut member 3. Note that the first joint member 2 and the second joint member 4 are arranged coaxially. The second joint member 4 has a second fluid flow path 41 formed on the inner periphery and a flange 42 provided on the outer periphery of the end.

One end of the second fluid flow path 41 opens at the abutting end surface 43 of the second joint member 4 . Process gas or purge gas is supplied to the semiconductor manufacturing equipment through the second fluid flow path 41 . Note that it is preferable that the first fluid flow path 21 and the second fluid flow path 41 be formed to have the same diameter.

In this embodiment, a bearing 5 for preventing co-rotation is provided between the flange 42 and the bottom surface portion 31 of the nut member 3, but the bearing 5 is not limited to this. You don't have to.

Similar to the first joint member 2, the annular (specifically annular) abutting end surface 43 of the second joint member 4, which faces the other end surface of the gasket 6, has a second contact area 44 and a second protrusion. 45 are provided. The second protrusion 45 is located radially inner than the second contact area 44 .

The second contact area 44 is a flat surface for contacting the second holding portion 722 of the second retainer 72 of the retainer 7 . Like the first contact area 25, the second contact area 44 is formed in an annular shape (specifically, an annular shape) on the outer peripheral edge of the abutting end surface 43.

The second protrusion 45 is pressed against one end surface of the gasket 6. Like the first protrusion 26, the second protrusion 45 is formed in an annular shape (specifically, an annular shape) so as to protrude from the abutting end surface 43. Further, the second protrusion 45 is tapered toward its tip.

The amount of protrusion of the first protrusion 26 (i.e., the distance from the first contact area 25 to the tip of the first protrusion 26) is the amount of protrusion of the second protrusion 45 (i.e., the distance from the second abutment area 44 to the tip of the second protrusion). 45). Further, the tip of the first protrusion 26 and the tip of the second protrusion 45 are formed on the same circumference.

The gasket 6 is an annular (specifically annular) sealing material interposed between the abutting end surface 24 of the first joint member 2 and the abutting end surface 43 of the second joint member 4. Gasket 6 has a single outer diameter without having multiple outer diameters. Thereby, the gasket 6 can be simplified.

Further, the gasket 6 is made of a shape memory alloy. As a result, by performing a process such as heating on the gasket 6 used as the gasket 6 of the joint structure 1, the shape of the gasket 6 can be restored to its original shape, so the gasket 6 can be repeatedly used without being discarded. Can be reused. Therefore, the cost of the joint structure 1 can be reduced by reusing the gasket 6.

The retainer 7 is a holding means for holding the gasket 6. The retainer 7 includes a first retainer 71 attached to the outer circumferential surface of the first joint member 2 (specifically, the stepped portion 22), and a second retainer 72 detachably attached to the first retainer 71.

The first retainer 71 and the second retainer 72 abut on the first contact area 25 of the first joint member 2 and the second contact area 44 of the second joint member 4, respectively. Then, in a state where the nut member 3 is tightened to the first joint member 2, the first retainer 71 and the second retainer 72 holding the gasket 6 are moved between the first contact area 25 and the second contact area 44. sandwiched between. As a result, when the nut member 3 is tightened to the first joint member 2, the clearance between the first abutment area 25 and the second abutment area 44 (that is, the butt end face 24 of the first joint member 2 Since the clearance between the second joint member 4 and the abutting end surface 43 is maintained by the presence of the gasket 6, the first retainer 71, and the second retainer 72, excessive tightening of the gasket 6 can be prevented.

Note that the first retainer 71, the second retainer 72, the first joint member 2, and the second joint member 4 are made of the same metal material. Furthermore, the hardness of the first retainer 71, the second retainer 72, the first joint member 2, and the second joint member 4 is higher than the hardness of the gasket 6.

As shown in FIGS. 1 to 2D, the first retainer 71 has a first held part 711 held on the outer peripheral surface (specifically, the stepped part 22) of the first joint member 2, and It has a first holding part 712 connected to the first held part 711 so as to come into contact with the region 25 and the outer edge of one end surface of the gasket 6 .

The first held portion 711 is composed of a plurality (three in this case) of first held claws 711a formed on the same circumference at predetermined intervals. The first held portion 711 can slide on the stepped portion 22. The plurality of first held claws 711a are formed to extend in the axial direction. The base ends of the plurality of first held claws 711a are connected to the first holding part 712.

The first holding part 712 includes a first connecting part 713 connected to the first held part 711 and a first thickening part connected to the first connecting part 713 so as to overlap with the first connecting part 713 in the radial direction. 714. Note that the thickness of the first holding portion 712 (that is, the total thickness of the first connecting portion 713 and the first thickened portion 714) is slightly smaller than the amount of protrusion of the first protrusion 26.

The first connecting portion 713 is constituted by an annular (specifically, annular) plate, and abuts on the first contact area 25 of the first joint member 2 . A plurality of first held claws 711a are connected to the outer peripheral edge of one end surface of the first connecting portion 713. On the other hand, a plurality of first thickening pieces 714a are connected to the inner peripheral edge of the other end surface of the first connecting portion 713.

The first thickened portion 714 abuts the outer edge of one end surface of the gasket 6 . Further, the first thickened portion 714 is configured by bending in the radial direction a plurality (in this case, three) of first thickened pieces 714a formed on the same circumference at predetermined intervals. Note that the plurality of first thickening pieces 714a are provided corresponding to the positions of the plurality of first held claws 711a, respectively.

Further, in the present embodiment, the first holding part 712 is composed of both the first connecting part 713 and the first thickened part 714, but is not limited to this. It may be configured only from the first connecting portion 713 without having the portion 714. In this case, the first connecting portion 713 is formed so that its thickness is the sum of the thicknesses of the first connecting portion 713 and the first thickened portion 714 of this embodiment.

The second retainer 72 is formed separately from the first retainer 71. Thereby, the gasket 6 can be easily removed by separating the first retainer 71 and the second retainer 72 during maintenance or parts replacement.

As shown in FIGS. 1 to 2D, the second retainer 72 includes a second held part 721 that is held by the first held part 711 and accommodates the gasket 6, and a second held part 721 that is held by the first held part 711 and accommodates the gasket 6, A second holding part 722 is connected to the second held part 721 so as to come into contact with the outer edge of the end surface.

The second held portion 721 is composed of a plurality (three in this case) of second held claws 721a formed on the same circumference at predetermined intervals. The second held part 721 can slide on the first held part 711. Furthermore, the gasket 6 can slide within the plurality of second held claws 721a. The second held claw 721a is formed to extend in the axial direction similarly to the first held claw 711a.

Further, the second held portion 721 is arranged between the first held portion 711 and the female thread 33 so as not to come into contact with the female thread 33 of the nut member 3 . Thereby, it is possible to prevent the second held portion 721 from biting into the female thread 33 due to thermal expansion.

The second holding part 722 includes a second connecting part 723 connected to the second held part 721 and a second thickening part connected to the second connecting part 723 so as to overlap with the second connecting part 723 in the radial direction. 724. Note that the thickness of the second clamping part 722 (that is, the total thickness of the second connecting part 723 and the second thickened part 724) matches the thickness of the first clamping part 712, and the amount of protrusion of the second protrusion 45 is equal to the thickness of the second clamping part 722. slightly smaller than

As a result, when the nut member 3 is tightened to the first joint member 2, the distance from the first contact area 25 to one end surface of the gasket 6 and the distance from the second contact area 44 to the other end surface of the gasket 6 are determined. The distances can be made the same. Furthermore, as described above, since the amount of protrusion of the first protrusion 26 and the amount of protrusion of the second protrusion 45 match, the amount of biting of the first protrusion 26 into one end surface of the gasket 6 (i.e., the amount of the first protrusion 26 (the difference between the amount of protrusion and the thickness of the first clamping part 712) and the amount of biting of the second protrusion 45 into the other end surface of the gasket 6 (that is, the difference between the amount of protrusion of the second protrusion 45 and the thickness of the second clamping part 722). (difference between the two) can be made the same.

The second connecting portion 723 is formed of an annular (specifically, annular) plate, and abuts on the second contact area 44 of the second joint member 4 . A plurality of second held claws 721a are connected to the outer peripheral edge of one end surface of the second connecting portion 723. On the other hand, a plurality of second thickening pieces 724a are connected to the inner peripheral edge of the other end surface of the second connecting portion 723.

The second thickened portion 724 abuts the outer edge of the other end surface of the gasket 6 . Further, the second thickened portion 724 is configured by bending in the radial direction a plurality (in this case, three) of second thickened pieces 724a formed at predetermined intervals on the same circumference. Note that the plurality of second thickening pieces 724a are provided corresponding to the positions of the plurality of second held claws 721a, respectively.

Further, in this embodiment, the second holding part 722 is composed of both the second connecting part 723 and the second thickened part 724, but is not limited to this. It may be configured only from the second connecting portion 723 without having the portion 724. In this case, the second connecting portion 723 is formed so that its thickness is the sum of the thicknesses of the second connecting portion 723 and the second thickened portion 724 of this embodiment.

The gasket 6 is held by the first retainer 71 and the second retainer 72 so as to be held between the first holding part 712 and the second holding part 722. As a result, when the nut member 3 is tightened to the first joint member 2, the clearance between the first abutting area 25 and the second abutting area 44 is determined by the first clamping of the gasket 6 and the first retainer 71. 712 and the second clamping portion 722 of the second retainer 72, excessive tightening of the gasket 6 can be prevented.

Next, a method for assembling the joint structure 1 will be described with reference to FIG. 3.

FIG. 3 is a flowchart showing a method for assembling the joint structure 1.

As shown in FIG. 3, first, in step S1, the gasket 6 is held by the retainer 7 so as to be located between the first retainer 71 and the second retainer 72. As shown in FIG. Specifically, in step S1, the gasket 6 is housed in the second retainer 72, and the second retainer 72 in which the gasket 6 is housed is attached to the first retainer 71. Note that at this time, the gasket 6 is located between the first clamping part 712 of the first retainer 71 and the second clamping part 722 of the second retainer 72.

Next, in step S2, the retainer 7 holding the gasket 6 is attached to the outer circumferential surface (specifically, the stepped portion 22) of the first joint member 2. Specifically, in step S2, the first retainer 71 to which the second retainer 72 is attached is slid and fitted onto the stepped portion 22 of the first joint member 2.

Next, in step S3, the second joint member 4 is inserted into the nut member 3. Specifically, in step S3, with the bearing 5 attached to the outer peripheral surface of the second joint member 4, the second joint member 4 is inserted into the nut member 3 so as to pass through the through hole 32 of the nut member 3. . At this time, the bearing 5 is located between the bottom surface portion 31 of the nut member 3 and the flange 42 of the second joint member 4.

Next, in step S4, the retainer 7 is held between the first contact area 25 and the second contact area 44, and the end of the second joint member 4 inserted into the nut member 3 is locked. The nut member 3 is screwed into the first joint member 2 to which the retainer 7 is attached.

Specifically, in step S4, when the nut member 3 is screwed into the first joint member 2, the gap between the first contact area 25 of the first joint member 2 and the second contact area 44 of the second joint member 4 clearance becomes smaller. Then, the first clamping part 712 of the first retainer 71 contacts the first contact area 25 and the outer edge of one end surface of the gasket 6, and the second clamping part 722 of the second retainer 72 contacts the second contact area 44. and the outer edge of the other end surface of the gasket 6, the clearance between the first contact area 25 and the second contact area 44 is maintained. Therefore, excessive tightening of the gasket 6 can be prevented.

In the present embodiment, the method for assembling the joint structure 1 is performed in the order of step S1, step S2, and step S3, but is not limited to this. For example, the method of assembling the joint structure 1 is performed in the order of step S1, step S3, and step S2. May be done. Alternatively, step S3, step S1, and step S2 may be performed in this order.

Next, the effects of this embodiment will be explained.

The joint structure 1 according to the present embodiment includes a first joint member 2 in which a first fluid flow path 21 is formed on the inner periphery and a male thread 23 on the outer periphery, and a nut having a female thread 33 that is screwed into the male thread 23. A member 3, a second joint member 4 having a second fluid flow path 41 formed on its inner periphery and whose end is locked in the nut member 3, a butting end surface 24 of the first joint member 2, and the second joint member. 4, a first retainer 71 attached to the outer peripheral surface of the first joint member 2, and a second retainer 72 detachably attached to the first retainer 71. and a retainer 7 that holds the gasket 6 by a first retainer 71 and a second retainer 72. The abutting end surface 24 of the first joint member 2 has a first contact area 25 with which the first retainer 71 comes into contact, and a second contact area 25 which is located inside the first contact area 25 and is pressed against one end surface of the gasket 6. The abutting end surface 43 of the second joint member 4 has a second contact area 44 with which the second retainer 72 comes into contact, and a gasket located inside the second contact area 44. 6 is provided, and the retainer 7 is held between the first contact area 25 and the second contact area 44.

The method of assembling the joint structure 1 according to the present embodiment includes a step S1 in which the gasket 6 is held in the retainer 7 so as to be located between the first retainer 71 and the second retainer 72, and a step S1 in which the gasket 6 is held in the retainer 7. step S2 of attaching the second joint member 4 to the outer circumferential surface of the first joint member 2; step S3 of inserting the second joint member 4 into the nut member 3; and a step S3 of inserting the second joint member 4 into the nut member 3; and a step S4 of screwing the nut member 3 into the first joint member 2 to which the retainer 7 is attached so that the end of the second joint member 4 inserted into the nut member 3 is locked while being held by the nut member 3. .

According to these configurations, when the nut member 3 is tightened to the first joint member 2, the clearance between the first abutting area 25 and the second abutting area 44 is larger than that of the gasket 6 and the first retainer 71. Since this is maintained by the presence of the second retainer 72, excessive tightening of the gasket 6 can be prevented.

Moreover, since the first retainer 71 and the second retainer 72 abut on the first contact area 25 and the second contact area 44, respectively, the abutting end surface 24 of the first joint member 2 and the abutting end surface of the second joint member 4 There is no need to separately provide a protrusion on 43 to prevent excessive tightening. Therefore, the first joint member 2 and the second joint member 4 can be simplified.

Further, since the second retainer 72 is detachably attached to the first retainer 71, the gasket 6 can be easily removed by separating the first retainer 71 and the second retainer 72 during maintenance or parts replacement. can.

Further, in the present embodiment, the first retainer 71 is attached to the first held portion 711 held on the outer circumferential surface of the first joint member 2, the first abutting region 25, and the outer edge of one end surface of the gasket 6. A first holding part 712 is connected to the first held part 711 so as to be in contact with the second held part 712. 721, and a second holding part 722 connected to the second held part 721 so as to come into contact with the second contact area 44 and the outer edge of the other end surface of the gasket 6. The gasket 6 is held between the first holding part 712 and the second holding part 722.

According to this configuration, when the nut member 3 is tightened to the first joint member 2, the clearance between the first contact area 25 and the second contact area 44 is larger than that of the gasket 6 and the first retainer 71. Since it is held by the first clamping part 712 and the second clamping part 722 of the second retainer 72, excessive tightening of the gasket 6 can be prevented.

Further, in the present embodiment, the first holding part 712 includes a first connecting part 713 connected to the first held part 711 and a first connecting part 713 connected to the first connecting part 713 so as to overlap with the first connecting part 713. The second clamping part 722 has a second connecting part 723 connected to the second held part 721 and a second connecting part 723 so as to overlap with the second connecting part 723. and a second thickened portion 724 connected thereto.

According to this configuration, the first clamping part 712 and the second clamping part 722 can be easily formed.

Further, in this embodiment, the second held part 721 is arranged between the first held part 711 and the female thread 33 so as not to come into contact with the female thread 33 of the nut member 3 .

According to this configuration, it is possible to prevent the second held portion 721 from biting into the female thread 33 due to thermal expansion.

Further, in this embodiment, the gasket 6 is made of a shape memory alloy.

According to this configuration, it is possible to prevent the gasket 6 from collapsing (destruction) due to excessive tightening of the gasket 6, so that the shape memory function of the gasket 6 can be maintained.

Although the present embodiment has been described above, the above-mentioned embodiment only shows a part of the application example of the present invention, and the purpose is to limit the technical scope of the present invention to the specific configuration of the above-described embodiment. isn't it.

(Modified example)
In the embodiment described above, the first held portion 711 of the first retainer 71 is attached to the outer circumferential surface of the first joint member 2, but is not limited to this. It may be attached to the outer peripheral surface of. In this case, the female thread 33 of the nut member 3 is formed closer to the bottom surface portion 31 of the nut member 3 than in the embodiment described above.

Further, in the embodiment described above, the first held portion 711 and the first connection portion 713 of the first clamping portion 712 in the first retainer 71 are each composed of a plurality of first held claws 711a and an annular plate. However, it is not limited to this, and for example, it may be composed of a cylindrical (specifically, cylindrical) part and a plurality of claw parts formed on the cylindrical part at predetermined intervals. . In this case, a plurality of first thickened portions 714 are connected to the plurality of claw portions as the first connecting portions 713, respectively. This prevents the second held part 721 of the second retainer 72 from rotating relative to the first held part 711 of the first retainer 71 and falling off from the first held part 711. Therefore, the second held part 721 can be reliably held by the first held part 711.

Furthermore, in the embodiment described above, the second held part 721 and the second connection part 723 of the second clamping part 722 in the second retainer 72 are each composed of a plurality of second held claws 721a and an annular plate. However, it is not limited to this, and for example, it may be composed of a cylindrical (specifically, cylindrical) part and a plurality of claw parts formed on the cylindrical part at predetermined intervals. . In this case, a plurality of second thickened portions 724 are connected to the plurality of claw portions as the second connecting portions 723, respectively. This prevents the second held part 721 of the second retainer 72 from rotating relative to the first held part 711 of the first retainer 71 and falling off from the first held part 711. Therefore, the second held part 721 can be reliably held by the first held part 711.

Further, in the embodiment described above, the amount of protrusion of the first protrusion 26 and the thickness of the first clamping part 712 correspond to the amount of protrusion of the second protrusion 45 and the thickness of the second clamping part 722, respectively. For example, the amount of protrusion of the second protrusion 45 and the thickness of the second holding part 722 may be different from each other. In this case, the amount of biting of the first protrusion 26 into one end surface of the gasket 6 (that is, the difference between the amount of protrusion of the first protrusion 26 and the thickness of the first holding part 712) and the amount of bite into the other end surface of the gasket 6 It is sufficient that the amount of bite of the second protrusion 45 (that is, the difference between the amount of protrusion of the second protrusion 45 and the thickness of the second holding part 722) matches.

1 Joint structure 2 First joint member 3 Nut member 4 Second joint member 6 Gasket 7 Retainer (holding means)
21 First fluid flow path 22 Recessed portion (holding portion)
23 Male thread 24 Butt end surface (first joint member side)
25 First contact area 26 First protrusion 33 Female thread 41 Second fluid flow path 43 Butt end surface (second joint member side)
44 Second contact area 45 Second protrusion 71 First retainer 72 Second retainer 711 First held part 712 First clamping part 713 First connecting part 714 First thickened part 722 Second clamping part 723 Second connecting part 724 Second thickened part

Claims (5)

a first joint member in which a first fluid flow path is formed on the inner periphery and a male thread is formed on the outer periphery;
a nut member having a female thread that engages with the male thread;
a second joint member having a second fluid flow path formed in its inner periphery and having an end portion locked within the nut member;
a gasket interposed between the abutting end face of the first joint member and the abutting end face of the second joint member;
a first retainer attached to the outer peripheral surface of the first joint member or the second joint member; and a second retainer detachably attached to the first retainer, and the gasket is attached to the first retainer and the second retainer. a holding means held by a second retainer;
The abutting end surface of the first joint member includes a first abutting area in which either the first retainer or the second retainer abuts, and a first abutting area located inside the first abutting area and the a first protrusion pressed against one end surface of the gasket;
The abutting end surface of the second joint member includes a second abutting area in which the other of the first retainer and the second retainer abuts, and a second abutting area located inside the second abutting area and the second abutting area. a second protrusion pressed against the other end surface of the gasket;
The holding means is held between the first contact area and the second contact area ,
The first retainer is
a first held part held on the outer peripheral surface of the first joint member or the second joint member;
a first holding part connected to the first held part so as to come into contact with one of the first contact area and the second contact area and the gasket;
The second retainer is
a second held part that is held by the first held part and accommodates the gasket;
a second holding part connected to the second held part so as to come into contact with the other of the first contact area and the second contact area and the gasket;
The gasket is held between the first holding part and the second holding part,
Joint structure. The first holding part is
a first connecting part connected to the first held part;
a first thickened part connected to the first connecting part so as to overlap with the first connecting part,
The second holding part is
a second connecting part connected to the second held part;
a second thickened part connected to the second connection part so as to overlap with the second connection part,
The joint structure according to claim 1 . The second held part is arranged between the first held part and the female thread so as not to come into contact with the female thread of the nut member.
The joint structure according to claim 1 or 2 . The gasket is made of a shape memory alloy.
The joint structure according to any one of claims 1 to 3 . A joint structure assembly method for assembling the joint structure according to any one of claims 1 to 4 ,
holding the gasket in the holding means so as to be located between the first retainer and the second retainer;
attaching the holding means holding the gasket to the outer peripheral surface of the first joint member or the second joint member;
inserting the second joint member into the nut member;
The holding means is held between the first abutment area and the second abutment area, and the first screwing the nut member into the joint member;
How to assemble the joint structure.

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