JP2021071118A - Joint structure and assembly method of the same - Google Patents

Abstract

To provide a joint structure which can prevent a gasket from being excessively fastened while achieving simplification of a joint member, and to provide an assembly method of the joint structure.SOLUTION: A joint structure 1 includes: a first joint member 2; a second joint member 4; a gasket 6 disposed between the first joint member 2 and the second joint member 4; and a retainer 7 which is attached to the outer periphery side of the first joint member 2 and holds the gasket 6. A butted end surface 24 of the first joint member 2 is provided with: a first contact area 25 with which the retainer 7 contacts; and a first projection 26 pressed to one end surface of the gasket 6. A butted end surface 43 of the second joint member 4 is provided with: a second contact area 44 with which the retainer 7 contacts; and a second projection 45 pressed to the other end surface of the gasket 6.SELECTED DRAWING: Figure 1

Description

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

Patent Document 1 describes a first joint member in which a male screw is formed on the outer periphery, a nut member screwed into the male screw, a second joint member inserted into the nut member, and a first joint member and a second joint member. A joint structure comprising a gasket provided between the two and a retainer for holding the gasket is disclosed.

Japanese Unexamined Patent Publication No. 2018-17381

However, in the joint structure described in Patent Document 1, since the butt end face of the first joint member and the butt end face of the second joint member are provided with annular protrusions for preventing overtightening, the structures of the first joint member and the second joint member are provided. Becomes complicated.

The present invention has been made in view of the above circumstances, and provides a joint structure and a method for assembling the joint structure that can prevent overtightening of the gasket while simplifying the joint member. The purpose.

According to an aspect of the present invention, a first joint member in which a first fluid flow path is formed on the inner circumference and a male screw is formed on the outer circumference, a nut member having a female screw screwed into the male screw, and an inner circumference. A second fluid flow path is formed in the second joint member, and an end portion is locked in the nut member, and an interposition between the butt end surface of the first joint member and the butt end surface of the second joint member. A gasket to be mounted and a retainer attached to the outer peripheral side of the first joint member or the second joint member to hold the gasket are provided, and the retainer is applied to the abutting end surface of the first joint member. A first contact area in contact and a first protrusion located inside the first contact area and pressed against one end face of the gasket are provided, and the abutted end face of the second joint member is provided with a butt end face. A second contact area to which the retainer can contact and a second protrusion located inside the second contact area and pressed against the other end face of the gasket are provided, and the retainer is provided with the retainer. A joint structure sandwiched between the first contact area and the second contact area is provided.

According to the aspect of the present invention, it is possible to prevent overtightening of the gasket while simplifying the joint member.

It is sectional drawing which shows the joint structure which concerns on embodiment of this invention. It is a perspective view which shows the retainer. It is a front view which shows the retainer. It is a rear view which shows the retainer. It is a flowchart which shows the assembly method of the joint structure which assembles the joint structure.

Hereinafter, embodiments of the present invention (hereinafter, referred to as the present embodiment) will be described with reference to the accompanying drawings. Throughout the specification, the same elements are designated by the same reference numerals.

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

FIG. 1 is a cross-sectional view showing a joint structure 1 according to the present embodiment. In FIG. 1, a part of the first joint member 2 and the second joint member 4 is omitted. FIG. 2A is a perspective view showing the retainer 7. FIG. 2B is a front view showing the retainer 7. FIG. 2C is a rear view showing the retainer 7. Further, in the drawing, the axial direction of the joint structure 1 is simply referred to as an axial direction, and the radial direction of the joint structure 1 is simply referred to as a radial direction.

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

The first joint member 2 is a metal pipe member for supplying a process gas or a purge gas to a semiconductor manufacturing apparatus, and is formed in 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 circumference, a stepped portion 22 as a holding portion formed on a part of the outer circumference, and a male screw 23 formed on the other part of the outer circumference. And have.

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

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

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

The first contact region 25 is a flat surface for contacting the first sandwiching portion 72 of the retainer 7, which will be described later. The first contact region 25 is formed in an annular shape (specifically, an annular shape) on the outer peripheral edge of the butt end face 24.

The first protrusion 26 is pressed against one end face of the gasket 6. The first protrusion 26 is formed in an annular shape (specifically, an annular shape) so as to project from the butt end face 24. Further, the first protrusion 26 is formed so as to taper toward the tip thereof.

The nut member 3 is a metal bag nut for accommodating the end portion of the first joint member 2 and the end portion of the second joint member 4. The nut member 3 is formed in a substantially bottomed tubular shape (specifically, a substantially bottomed cylindrical shape). A through hole 32 penetrating the bottom surface portion 31 is formed in the bottom surface portion 31 of the nut member 3. The second joint member 4 is inserted through the through hole 32. A female screw 33 screwed into the male screw 23 of the first joint member 2 is formed on the inner circumference of the nut member 3 on the tip 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 the semiconductor manufacturing apparatus, and has a substantially cylindrical shape (specifically, a substantially cylindrical shape). Is formed in. The end of the second joint member 4 is locked to the nut member 3. 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 circumference and a flange 42 provided on the outer periphery of the end portion.

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 apparatus through the second fluid flow path 41. It is preferable that the first fluid flow path 21 and the second fluid flow path 41 are formed to have the same diameter.

In the present 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 present invention is not limited to this, and for example, the bearing 5 is provided. It does not have to be.

Similar to the first joint member 2, the second contact region 44 and the second protrusion are formed on the annular (specifically, annular) butt end surface 43 of the second joint member 4 facing the other end surface of the gasket 6. 45 is provided. The second protrusion 45 is located inside the second contact region 44 in the radial direction.

The second contact region 44 is a flat surface for contacting the second sandwiching portion 73 of the retainer 7, which will be described later. The second contact region 44 is formed in an annular shape (specifically, an annular shape) on the outer peripheral edge of the butt end face 43, similarly to the first contact region 25.

The second protrusion 45 is pressed against one end face 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 project from the butt end face 43. Further, the second protrusion 45 is formed so as to taper toward the tip thereof.

The protrusion amount of the first protrusion 26 (that is, the distance from the first contact region 25 to the tip of the first protrusion 26) is the protrusion amount of the second protrusion 45 (that is, the second protrusion from the second contact region 44). Distance to the tip of 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 butt end surface 24 of the first joint member 2 and the butt end surface 43 of the second joint member 4. The gasket 6 has a single outer diameter. Thereby, the gasket 6 can be simplified.

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

As shown in FIGS. 1 to 2C, the retainer 7 is a holding member attached to the step portion 22 of the first joint member 2 to hold the gasket 6. The retainer 7, the first joint member 2, and the second joint member 4 are made of the same metal material. Further, the hardness of the retainer 7, the first joint member 2 and the second joint member 4 is higher than the hardness of the gasket 6.

The retainer 7 contacts the first contact region 25 of the first joint member 2 and the second contact region 44 of the second joint member 4. Then, in a state where the nut member 3 is tightened to the first joint member 2, the retainer 7 holding the gasket 6 is sandwiched between the first contact region 25 and the second contact region 44. As a result, in a state where the nut member 3 is tightened to the first joint member 2, the clearance between the first contact region 25 and the second contact region 44 (that is, the butt end surface 24 of the first joint member 2). The clearance between the butt end face 43 of the second joint member 4) is maintained by the presence of the gasket 6 and the retainer 7, so that excessive tightening of the gasket 6 can be prevented.

The retainer 7 hits the held portion 71 held on the outer peripheral surface (specifically, the step portion 22) of the first joint member 2 and the outer edge of the first contact region 25 and one end surface of the gasket 6. Connection for connecting the first holding portion 72 in contact, the second holding portion 73 in contact with the second contact region 44 and the outer edge of the other end surface of the gasket 6, and the first holding portion 72 and the second holding portion 73. It has a part 74 and. The gasket 6 is sandwiched between the first sandwiching portion 72 and the second sandwiching portion 73.

The held portion 71 is composed of a plurality of (here, three) held claws 71a, 71b, 71c formed on the same circumference at different intervals. The plurality of held claws 71a, 71b, 71c are formed so as to extend in the substantially axial direction. Further, the base ends of the plurality of held claws 71a, 71b, 71c are connected to a plurality (here, three) bellows 72a, 72b, 72c of the first holding portion 72, which will be described later, respectively.

The first holding portion 72 is composed of bellows 72a, 72b, 72c as a plurality of holding claws formed on the same circumference at different intervals. The bellows 72a, 72b, 72c are formed so as to extend in the radial direction. The bellows 72a, 72b, 72c have diameters of the first bent portions 721a, 721b, 721c and the first bent portions 721a, 721b, 721c, which are connected to the base ends of the held claws 71a, 71b, 71c, respectively. It has second bent portions 722a, 722b, 722c connected to the first bent portions 721a, 721b, 721c so as to overlap in the direction.

The first bent portions 721a, 721b, 721c abut on the first contact region 25, and the second bent portions 722a, 722b, 722c abut on the outer edge of one end surface of the gasket 6. The thickness of the bellows 72a, 72b, 72c (that is, the total thickness of the first bent portions 721a, 721b, 721c and the second bent portions 722a, 722b, 722c) is larger than the protrusion amount of the first protrusion 26. Slightly small.

The connecting portion 74 is located between the outer peripheral surface of the gasket 6 and the female screw 33 so as not to come into contact with the female screw 33 of the nut member 3. As a result, it is possible to prevent the connecting portion 74 from biting into the female screw 33 due to thermal expansion.

The connecting portion 74 is composed of a plurality of (here, three) connecting pieces 74a, 74b, 74c formed on the same circumference at different intervals. The connecting pieces 74a, 74b, 74c are formed so as to extend in the axial direction. The gasket 6 is housed inside the connecting pieces 74a, 74b, 74c. Further, the connecting pieces 74a, 74b and 74c connect the bellows 72a, 72b and 72c and the second sandwiching portion 73, respectively.

The held claws 71a, 71b, 71c, bellows 72a, 72b, 72c and the connecting pieces 74a, 74b, 74c are formed on the same circumference at different intervals, respectively, and the substantially rectangular plate pieces 75a, 75b are formed. , 75c is bent a plurality of times. Thereby, the held claws 71a, 71b, 71c, the bellows 72a, 72b, 72c and the connecting pieces 74a, 74b, 74c can be easily formed by the plate pieces 75a, 75b, 75c. The number of held claws 71a, 71b, 71c, bellows 72a, 72b, 72c and connection pieces 74a, 74b, 74c is the same as the number of plate pieces 75a, 75b, 75c.

The distance between the adjacent plate pieces 75a and 75b is larger than the distance between the adjacent plate pieces 75a and 75c and the distance between the adjacent plate pieces 75b and 75c. As a result, the gasket 6 can be press-fitted between the first sandwiching portion 72 and the second sandwiching portion 73 along the radial direction from the distance between the adjacent plate pieces 75a and 75c.

The second sandwiching portion 73 is connected to the base 731 connected to the connecting pieces 74a, 74b, 74c (that is, the base ends of the plate pieces 75a, 75b, 75c) and to the base 731 so as to overlap the base 731 in the radial direction. It has a thickened portion 732 and. The thickness of the second sandwiching portion 73 (that is, the total thickness of the base 731 and the thickened portion 732) matches the thickness of the first sandwiching portion 72, and is slightly smaller than the protrusion amount of the second protrusion 45. ..

As a result, in a state where the nut member 3 is tightened to the first joint member 2, the distance from the first contact region 25 to one end face of the gasket 6 and the distance from the second contact region 44 to the other end face of the gasket 6 Can be the same as the distance to. Further, as described above, since the protruding amount of the first protrusion 26 and the protruding amount of the second protrusion 45 match, the amount of biting of the first protrusion 26 into one end surface of the gasket 6 (that is, the first protrusion 26). (Difference between the amount of protrusion and the thickness of the first sandwiching portion 72) and the amount of the second protrusion 45 biting into the other end surface of the gasket 6 (that is, the amount of protrusion of the second protrusion 45 and the thickness of the second sandwiching portion 73). (Difference from) can be the same.

The base 731 is formed in an annular shape (specifically, an annular shape) and abuts on the outer edge of the other end face of the gasket 6. A plurality of connection pieces 74a, 74b, 74c are connected to the outer peripheral edge of one end surface of the base 731. On the other hand, a plurality of thickening pieces 732a, 732b, 732c are connected to the inner peripheral edge of the other end surface of the base 731.

The thickening portion 732 comes into contact with the second contact area 44. Further, the thickening portion 732 is formed by bending a plurality of (here, three) thickening pieces 732a, 732b, and 732c formed at different intervals on the same circumference in the radial direction, respectively. The plurality of thickening pieces 732a, 732b, 732c are provided corresponding to the positions of the plurality of plate pieces 75a, 75b, 75c, respectively.

Further, in the present embodiment, the second sandwiching portion 73 is composed of both the base 731 and the thickening portion 732, but the present invention is not limited to this, and for example, the second sandwiching portion 73 does not have the thickening portion 732. It may be composed of only the base 731. In this case, the base 731 is formed so that the thickness thereof is the total thickness of the first sandwiching portion 72 of the present embodiment.

The gasket 6 is held by the retainer 7 so as to be sandwiched between the first sandwiching portion 72 and the second sandwiching portion 73. As a result, in a state where the nut member 3 is tightened to the first joint member 2, the clearance between the first contact region 25 and the second contact region 44 is the gasket 6, the first holding portion 72, and the second. Since it is held by the holding portion 73, it is possible to prevent excessive tightening of the gasket 6.

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

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

As shown in FIG. 3, first, in step S1, the gasket 6 is held by the retainer 7. Specifically, in step S1, the gasket 6 is press-fitted between the first sandwiching portion 72 and the second sandwiching portion 73 along the radial direction from the distance between the adjacent plate pieces 75a and 75c. Is held by the retainer 7. At this time, the gasket 6 is sandwiched between the first sandwiching portion 72 and the second sandwiching portion 73.

Next, in step S2, the retainer 7 holding the gasket 6 is attached to the outer peripheral surface (specifically, the step portion 22) of the first joint member 2. Specifically, in step S2, the held portion 71 of the retainer 7 is slid with respect to the stepped portion 22 of the first joint member 2 to be fitted externally.

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 penetrate 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 sandwiched between the first contact region 25 and the second contact region 44, and the end portion 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, it is between the first contact region 25 of the first joint member 2 and the second contact region 44 of the second joint member 4. Clearance is reduced. Then, the first holding portion 72 of the retainer 7 comes into contact with the first contact region 25 and the outer edge of one end surface of the gasket 6, and the second holding portion 73 of the retainer 7 comes into contact with the second contact region 44 and the gasket 6. When in contact with the outer edge of the other end face, the clearance between the first contact area 25 and the second contact area 44 is maintained. Therefore, it is possible to prevent overtightening of the gasket 6.

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

Next, the action and effect of this embodiment will be described.

The joint structure 1 according to the present embodiment has a first joint member 2 in which a first fluid flow path 21 is formed on the inner circumference and a male screw 23 is formed on the outer circumference, and a nut having a female screw 33 screwed into the male screw 23. The member 3, the second joint member 4 in which the second fluid flow path 41 is formed on the inner circumference and the end is locked in the nut member 3, the butt end surface 24 of the first joint member 2, and the second joint member. A gasket 6 interposed between the butt end surface 43 of the fourth joint member 4 and a retainer 7 attached to the outer peripheral side of the first joint member 2 and holding the gasket 6 are provided. The butt end surface 24 of the first joint member 2 has a first contact area 25 with which the retainer 7 abuts, and a first protrusion located inside the first contact area 25 and pressed against one end surface of the gasket 6. 26 and 26 are provided, and the butt end surface 43 of the second joint member 4 is located inside the second contact area 44 to which the retainer 7 abuts and the second contact area 44, and the other of the gasket 6. A second protrusion 45, which is pressed against the end face, is provided, and the retainer 7 is sandwiched between the first contact region 25 and the second contact region 44.

The method of assembling the joint structure 1 according to the present embodiment includes a step S1 of holding the gasket 6 on the retainer 7, a step S2 of attaching the retainer 7 holding the gasket 6 to the outer peripheral side of the first joint member 2, and a second step. In the step S3 of inserting the joint member 4 into the nut member 3, the retainer 7 is sandwiched between the first contact region 25 and the second contact region 44, and the second joint member 4 is inserted into the nut member 3. The step S4 of screwing the nut member 3 into the first joint member 2 so that the end portion of the nut member 3 is locked is provided.

According to these configurations, when the nut member 3 is tightened to the first joint member 2, the clearance between the first contact region 25 and the second contact region 44 is the presence of the gasket 6 and the retainer 7. Therefore, it is possible to prevent overtightening of the gasket 6.

Further, since the retainer 7 abuts on the first contact region 25 and the second contact region 44, protrusions for preventing overtightening on the butt end face 24 of the first joint member 2 and the butt end face 43 of the second joint member 4 Does not need to be provided separately. Therefore, the first joint member 2 and the second joint member 4 can be simplified.

Further, in the present embodiment, the retainer 7 has a first holding portion 72 in which the first contact region 25 and the outer edge of one end face of the gasket 6 come into contact with each other, and the second contact region 44 and the other end face of the gasket 6. It has a second holding portion 73 that comes into contact with the outer edge of the above, and a connecting portion 74 that houses the gasket 6 and connects the first holding portion 72 and the second holding portion 73. The gasket 6 is sandwiched between the first sandwiching portion 72 and the second sandwiching portion 73.

According to this configuration, in a state where the nut member 3 is tightened to the first joint member 2, the clearance between the first contact region 25 and the second contact region 44 is the first sandwiching portion 72 and the second. Since it is held by the gasket 6 sandwiched between the sandwiching portion 73, the first sandwiching portion 72, and the second sandwiching portion 73, it is possible to prevent excessive tightening of the gasket 6. Further, since the connecting portion 74 connects the first sandwiching portion 72 and the second sandwiching portion 73, the retainer 7 having the first sandwiching portion 72, the second sandwiching portion 73, and the connecting portion 74 can be integrally formed. .. As a result, the joint structure 1 can be easily assembled.

Further, in the present embodiment, the connecting portion 74 is located between the gasket 6 and the female screw 33 so as not to come into contact with the female screw 33 of the nut member 3.

According to this configuration, it is possible to prevent the connecting portion 74 from biting into the female screw 33 due to thermal expansion.

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

According to this configuration, it is possible to prevent the gasket 6 from being crushed (broken) due to excessive tightening on 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-described embodiment shows only a part of the application examples 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. is not it.

(Modification example)
In the above-described embodiment, the held portion 71 of the retainer 7 is attached to the outer peripheral surface of the first joint member 2, but is not limited to this, and is, for example, on the outer peripheral surface of the second joint member 4. It may be attached. In this case, the female screw 33 of the nut member 3 is formed on the bottom surface portion 31 side of the nut member 3 as compared with the above-described embodiment.

Further, in the above-described embodiment, the first sandwiching portion 72 is composed of a plurality of bellows 72a, 72b, 72c, but is not limited thereto, and for example, a base formed in an annular shape and a base. It may be composed of a thickened portion connected to the base so as to overlap in the radial direction. In this case, the held portion 71 is connected to one end face of the base, and the thickened portion is connected to the other end face of the base. Further, the second holding portion 73 is composed of a plurality of bellows.

Further, in the above-described embodiment, the distance between the adjacent plate pieces 75a and 75b is formed to be larger than the distance between the adjacent plate pieces 75a and 75c and the distance between the adjacent plate pieces 75b and 75c. The present invention is not limited to this, and may be formed so as to coincide with, for example, the spacing between adjacent plate pieces 75a and 75c and the spacing between adjacent plate pieces 75b and 75c. That is, the plate pieces 75a, 75b, 75c are formed on the same circumference at equal intervals. In this case, the gasket 6 is not press-fitted between the first sandwiching portion 72 and the second sandwiching portion 73 along the radial direction, but is formed between the first sandwiching portion 72 and the second sandwiching portion 73 along the axial direction. It is necessary to press fit in between.

Further, in the above-described embodiment, the protruding amount of the first protrusion 26 and the thickness of the first sandwiching portion 72 are the same as the protruding amount of the second protrusion 45 and the thickness of the second sandwiching portion 73, respectively. It is not limited, and may be different from, for example, the amount of protrusion of the second protrusion 45 and the thickness of the second sandwiching portion 73, respectively. In this case, the amount of bite of the first protrusion 26 into one end face of the gasket 6 (that is, the difference between the amount of protrusion of the first protrusion 26 and the thickness of the first sandwiching portion 72) and the thickness of the first holding portion 72 into the other end face of the gasket 6. It suffices if the biting amount of the second protrusion 45 (that is, the difference between the protruding amount of the second protrusion 45 and the thickness of the second sandwiching portion 73) matches.

1 Joint structure 2 1st joint member 3 Nut member 4 2nd joint member 6 Gasket 7 Retainer 21 1st fluid flow path 22 Recess (holding part)
23 Male screw 24 Butted end face (first joint member side)
25 First contact area 26 First protrusion 33 Female screw 41 Second fluid flow path 43 Butted end face (second joint member side)
44 Second contact area 45 Second protrusion 71 Held portion 72 First sandwiching portion 73 Second sandwiching portion 74 Connection portion

Claims (5)

A first joint member in which a first fluid flow path is formed on the inner circumference and a male screw is formed on the outer circumference.
A nut member having a female screw to be screwed into the male screw,
A second joint member in which a second fluid flow path is formed on the inner circumference and an end thereof is locked in the nut member.
A gasket interposed between the butt end face of the first joint member and the butt end face of the second joint member.
A retainer attached to the outer peripheral side of the first joint member or the second joint member and holding the gasket is provided.
The butt end faces of the first joint member include a first contact area with which the retainer abuts, and a first protrusion located inside the first contact area and pressed against one end face of the gasket. Is provided,
On the butt end face of the second joint member, a second contact region where the retainer can come into contact and a second protrusion located inside the second contact region and pressed against the other end face of the gasket. And are provided,
The retainer is sandwiched between the first contact area and the second contact area.
Joint structure. The retainer
The first holding portion where the first contact region and the gasket are in contact with each other,
A second sandwiching portion where the second contact region and the gasket are in contact with each other,
The gasket is housed and has a connecting portion for connecting the first sandwiching portion and the second sandwiching portion.
The gasket is sandwiched between the first sandwiching portion and the second sandwiching portion.
The joint structure according to claim 1. The connection portion is located between the gasket and the female screw so as not to come into contact with the female screw of the nut member.
The joint structure according to claim 2. The gasket is made of a shape memory alloy.
The joint structure according to any one of claims 1 to 3. A method for assembling a joint structure according to any one of claims 1 to 4.
The step of holding the gasket in the retainer and
A step of attaching the retainer holding the gasket to the outer peripheral side of the first joint member or the second joint member, and
The step of inserting the second joint member into the nut member and
The first joint so that the retainer is sandwiched between the first contact region and the second contact region and the end portion of the second joint member inserted into the nut member is locked. A step of screwing the nut member into the member.
How to assemble the joint structure.

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