JP2020180676A - Sleeve for pipe joint, manufacturing method of sleeve, and pipe joint - Google Patents

Abstract

To provide a sleeve for a pipe joint which can be easily produced at low costs by using a cylindrical raw material and makes steps less likely to occur at the inner diameter side of welded portions.SOLUTION: In a sleeve 10 for a pipe joint, one end part is a joint side end part having a seal part 14 and a flange part 13 and the other end part is a welded end part 15. A diameter expanding portion 17 is formed at the inner periphery side of a predetermined range from the welded end part 15. An inner peripheral surface of the diameter expanding portion 17 is arranged coaxially with an outer peripheral surface of the welded end part 15 and has a predetermined inner diameter in at least the welded end part 15.SELECTED DRAWING: Figure 1

Description

The present invention relates to a sleeve for a pipe joint, a method for manufacturing the sleeve, and a pipe joint.

As a pipe joint for connecting various valves, pipes, etc. that are required to have high cleanliness, chemical resistance, and sealing property of a semiconductor manufacturing apparatus or the like, for example, the joint shown in Patent Document 1 is known. In this pipe joint, the one ends (joint side ends) of the first and second sleeves, which are pipe materials having a flange portion and a seal portion at one end, are abutted with each other via an annular gasket, and the first The female nut engaged with the flange portion of the sleeve and the male nut engaged with the flange portion of the second sleeve are screwed together to join and seal the two sleeves.
The other end of the sleeve (hereinafter, also referred to as “welding end”) may be weldable to a circular tubular portion of a fluid device, a stainless steel pipe, or the like (hereinafter, “tube”) (FIG. 2 of Patent Document 2). 5 mag).

This sleeve is made of stainless steel or the like, and in particular, the welding end side of the sleeve corresponding to automatic welding (see Patent Document 3) is required to have accuracy of outer shape and inner diameter. In addition, if there is a step on the inner peripheral surface of the welded portion after welding the welding end of the sleeve and the tube, liquid pools will occur and cause contamination, so coaxiality between the outer and inner circumferences is also required. .. Therefore, the sleeve is formed by cutting a stainless steel columnar material with a lathe or the like.

Special Table 2002-511919 JP-A-2016-194318 JP-A-2016-84925

However, when the sleeve is manufactured from a cylindrical member by cutting, not only the outer peripheral portion is cut but also the inner peripheral portion is drilled, so that the amount of cutting is large, it takes time, and the tool wears severely. .. Therefore, there is a problem that the cost becomes high.

Therefore, it is conceivable to use a cylindrical material instead of the cylindrical member.
However, since the cylindrical material of stainless steel is generally formed by extrusion molding or the like, the coaxiality between the outer circumference and the inner circumference is insufficient, and when the tube and the outer circumference are welded together, the welded portion becomes as described above. There is a risk of a step on the inner peripheral surface. For this reason, it is necessary to cut the finish of the inner peripheral surface in order to increase the coaxiality, and there is a problem that the cost cannot be significantly improved.

An object of the present invention is to solve such a problem and to provide a sleeve for a pipe joint which can be easily produced at a low cost by using a cylindrical material and in which a step on the inner diameter side of a welded portion is unlikely to occur. ..

The sleeve of the present invention is a sleeve for a pipe joint in which one end is a joint side end having a seal and a flange and the other end is a welding end.
An enlarged diameter portion is formed on the inner peripheral side of a predetermined range from the welding end portion, and the inner peripheral surface of the enlarged diameter portion is coaxial with the outer peripheral surface of the welding end portion, and at least at the welding end portion. It has a predetermined inner diameter and is characterized in that it is made of a cylindrical material.
The "predetermined inner diameter" is a nominal diameter of the inner diameter, such as 4.4 mm, 7.4 mm, 10.3 mm, and 16.57 mm.

Preferably, the enlarged diameter portion can adopt a configuration in which the portion has a constant inner diameter in the axial direction.

Preferably, the enlarged diameter portion is a portion having a constant inner diameter in the axial direction, and a configuration in which R is formed at a corner can be adopted.

Preferably, the enlarged diameter portion is a portion where the inner peripheral side of the welding end portion is chamfered, and a configuration having a tapered surface of approximately 45 ° can be adopted.

Preferably, the enlarged diameter portion is a portion tapered on the inner peripheral side of the welding end portion, and a configuration having a tapered surface smaller than 45 ° can be adopted.

The method for manufacturing a sleeve for a pipe joint of the present invention is a method for manufacturing any of the above sleeves.
The first step of forming the outer peripheral surface of the sleeve by cutting the outer peripheral portion with a lathe while grasping the outer peripheral portion of the cylindrical material with a chuck.
With the outer peripheral portion of the cylindrical material gripped by a chuck, the inner peripheral portion is machined in a predetermined range from the welding end portion, and the inner peripheral surface is coaxial with the outer peripheral surface and at least the welding end portion. In the second step of forming an enlarged diameter portion having a predetermined inner diameter,
A third step of cutting the one end side of the cylindrical material to form the seal portion of the sleeve.
It is characterized by including.

The pipe joint of the present invention includes an annular gasket and
A pipe material having a flange portion and a seal portion at one end portion, and the first and second sleeves at which the one end portions are abutted with the gasket sandwiched between them.
A female nut that is inserted through the first sleeve and has a reduced diameter portion on the inner peripheral surface of one end that engages with the flange of the first sleeve and has a threaded portion on the inner peripheral surface of the other end.
The inner peripheral surface is inserted into the second sleeve, one end of the inner peripheral surface engages with the flange portion of the first sleeve, and the outer peripheral surface has a threaded portion screwed with the threaded portion of the female nut. A pipe fitting that includes a male nut that has
At least one of the first and second sleeves is one of the sleeves of the present invention.

Alternatively, the fittings of the present invention
A sleeve, which is a pipe material with a flange and a seal at one end,
An annular gasket abutting on the one end of the sleeve and
A joint body having a seal portion at one end and a threaded portion on the outer peripheral surface, the one end of which is abutted against one end of the sleeve with the gasket in between.
It is inserted into the sleeve, and the reduced diameter portion of the inner peripheral surface of one end engages with the flange portion of the sleeve, and the inner peripheral surface of the other end has a threaded portion screwed into the threaded portion of the joint body. A pipe fitting that includes a female nut,
The sleeve is one of the sleeves of the present invention.

According to the present invention, since the inner peripheral side of the sleeve has a diameter-expanded portion 17 formed coaxially with the outer peripheral side of the welding end portion at the welding end portion, the sleeve is made of a cylindrical material. Even in the case of forming the sleeve, the sleeve can be easily machined at low cost because the cutting process on the inner diameter side for making it coaxial with the outer peripheral side is only performed near the end on the welding side.
Further, since the inner circumference and the outer circumference of the sleeve are coaxial with each other on the welding end face, there is no step on the inner circumference side of the welded portion with the tube, and clean piping can be realized.

The vertical sectional view which shows an example of the sleeve of this invention. It is an enlarged cross-sectional view which shows the welding side end part of the sleeve of this invention, (a) is the form which expanded the diameter of the inner peripheral side by a predetermined length, (b) is the corner part which expanded the diameter of the inner peripheral side by a predetermined length (C) shows a form in which the inner peripheral side is chamfered, and (d) shows a form in which the inner peripheral side is tapered. It is explanatory drawing which shows the manufacturing method of the sleeve of this invention, (a) shows a 1st step, (b) shows a 2nd step, (c) shows a cutting step, (d) shows a 3rd step. The vertical sectional view which shows an example of the pipe joint of this invention. The vertical sectional view which shows another example of the pipe joint of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a vertical cross-sectional view showing the sleeve of the present embodiment.
The sleeve 10 of the present embodiment is a sleeve for a pipe joint, made of SUS316L stainless steel, and has a cylindrical small diameter portion 11, a cylindrical large diameter portion 12, a flange portion 13, and an annular shape in the axial direction from the end portion. It is composed of a seal portion 14 that bulges out.

The small diameter portion 11 has a welding end portion 15, and is prepared to have various inner diameters and outer diameters according to the tube 50 to be welded, which will be described later.
The large-diameter portion 12 is a portion where the inner peripheral side of the nut 30 of the joint is in contact with each other, and has an outer diameter standardized according to the inner diameter of the reduced diameter portion of the nut 30.
The flange portion 13 is a portion that engages with the reduced diameter portion on the inner peripheral side of the nut 30 and is attracted in the axial direction.
The sealing portion 14 has a shape that bulges in an annular shape in the axial direction from the end portion of the sleeve 10, and is a portion that abuts and seals with the metal gasket 20 of the joint described later.

Here, in the sleeve 10 of the present invention, an enlarged diameter portion 17 is formed on the inner peripheral side within a predetermined range from the welding end portion 15, and in the expanded diameter portion, the inner peripheral surface is coaxial with the outer peripheral side, and at least for welding. It has a predetermined inner diameter at the end. In the present embodiment, as shown enlarged in FIG. 2A, the diameter-expanded portion 17 has a constant inner diameter in the axial direction, and the inner peripheral surface of the diameter-expanded portion 17 is coaxial with the outer peripheral surface. And it is the same as the inner diameter of the tube 50 to be welded. The step generated at the end of the enlarged diameter portion 17 is reduced by chamfering or the like.
As a result, even if the inner circumference of the non-diameter-expanded portion (16) is eccentric with respect to the outer circumference, when the welding end portion 15 of the sleeve 10 is welded together with the tube 50 and the outer circumferences, the welding end face (15) ), Since the inner peripheral surfaces coincide with each other, there is no step on the inner peripheral side of the welded portion with the tube 50.

However, the form of the enlarged diameter portion 17 is not limited to this, and the form in which the inner diameter is constant and R is added to the corner of the end portion as shown in FIG. 2 (b), and the inner peripheral side as shown in FIG. 2 (c). May be chamfered, or tapered to the inner peripheral side as shown in FIG. 2D.
In any form, if at least the welding end portion 15 has the same diameter and coaxiality with the outer peripheral side, it is possible to prevent a step from being generated on the inner peripheral side of the welded portion with the tube 50.

Next, the manufacturing method of the sleeve 10 of the present embodiment is shown in FIGS. 3A to 3D.
First, as a material, a cylindrical material of SUS316L is prepared. The outer diameter is substantially the same as the outer diameter of the flange portion 13 of the sleeve 10, and the inner diameter is smaller than the inner diameter of the sleeve 10 by the cutting allowance. It is desirable that the cutting allowance is the sum of the maximum deviation amount of the coaxiality between the inner diameter and the outer diameter of the cylindrical material and the maximum error amount of the inner diameter.
As the manufacturing apparatus, a lathe, particularly an NC lathe with a bar feeder capable of automatically changing tools and feeding out a cylindrical material as a material automatically or semi-automatically is desirable.

The outer circumference of the cylindrical material 60 selected in this way is grasped by the chuck 51, and the outer peripheral portion is cut by a lathe to form the outer peripheral surfaces of the small diameter portion 11, the large diameter portion 12 and the flange portion 13 of the sleeve 10. Step 1 is performed (FIG. 3 (a)).
This is because in this manufacturing method, the inner peripheral side is processed with the outer peripheral side as a reference, so that the outer peripheral side needs to be processed first.
In the present embodiment, the cylindrical material 60 is fed out with a bar feeder (not shown) longer than the length of the sleeve 10 by a cutting allowance, and the outer peripheral portion of the root is grasped by the chuck 51 to perform this first step.
The sleeve 10 is cut to the length after the next second step. However, the method is not limited to this method, and the first step may be performed after the cylindrical material 60 is cut to the length of the sleeve 10 in advance. However, it is preferable to cut it later as in the present embodiment in terms of production efficiency.

Next, as shown in FIG. 3B, while maintaining the attachment of the cylindrical material 60, the lathe tool is replaced with the inner peripheral cutting tool 53, and the inner peripheral portion 16 is predetermined from the welding end portion 15. A second step is performed in which only a range is cut to form an enlarged diameter portion 17 having an inner peripheral surface coaxial with the outer peripheral surface and having a predetermined inner diameter at least at the welding end portion 15.

Next, as shown in FIG. 3C, while maintaining the attachment of the cylindrical material 60 by the chuck 51, the lathe tool is replaced with the cutting tool 54, and the cylindrical material 60 is replaced with the length of the sleeve 10. A cylindrical material 60 composed of a small diameter portion 11, a large diameter portion 12, and a flange portion 13 is produced.

Next, as shown in FIG. 3D, the large-diameter portion 12 of the cut cylindrical member 60 is grasped by the collet chuck 55, and the end portion is cut by using a tool 56 with a lathe to form a seal portion 14. The third step of forming is performed.

Finally, the sleeve 10 is completed by chamfering the edges, electropolishing the inner peripheral surface, and the like, if necessary.

The sleeve of the present invention can be made of a cylindrical material, and since it is not necessary to cut the entire inner peripheral surface in order to coaxialize with the outer peripheral surface, it is easy to manufacture, the tool wear is small, and the cost is low. Can be formed.

Next, the pipe joint of the present invention using the sleeve of the present invention will be described.
FIG. 4 is a vertical cross-sectional view showing an example of the pipe joint of the present invention, and is an example of connecting two sleeves.
In this pipe joint 100, the one end portions (joint side end portions) 14 of the first and second sleeves 10a and 10b, which are pipe materials having a flange portion 13 and a seal portion 14 at one end portion, form an annular gasket 20. The female nut 30 engaged with the flange portion 13 of the first sleeve 10a and the male nut 40 engaged with the flange portion 23 of the second sleeve 10b are screwed together and screwed into each other. The sleeves 10a and 10b are joined and sealed.
Here, the sleeve of the present invention is used as the first and second sleeves 10a and 10b.

FIG. 5 is a vertical cross-sectional view showing another example of the pipe joint of the present invention, which is an example of connecting the sleeve and the joint body.
The pipe joint 200 includes a sleeve 10 which is a pipe material having a flange portion 13 and a seal portion 14 at one end, a joint body 70 having a seal portion at one end and a threaded portion on the outer peripheral surface, and an annular gasket 20. The sleeve 10 is made of a nut 30 that engages with the flange portion of the sleeve and has an inner peripheral screw, and the inner peripheral screw portion of the nut 30 is screwed into the outer peripheral screw portion of the joint body 70 and tightened. One end of the joint body 70 is pressed against the one end of the joint body 70 with the gasket 20 in between, and is sealed.
The sleeve is a sleeve for a pipe joint according to any one of claims 1 to 5. Here, the sleeve of the present invention is used as the sleeve 10.

In both the pipe joints of FIGS. 4 and 5, the inner peripheral side of the welded end of the sleeve is coaxial with the outer circumference and is the same as the inner diameter of the sleeve to be welded. Therefore, when the welding end of the sleeve is welded with the tube 50 and the outer diameter aligned with each other, the inner peripheral surfaces of the welding end surface coincide with each other, so that a step is generated on the inner peripheral side of the welded portion with the tube 50. Never.

The present invention is not limited to the above-described embodiment. A person skilled in the art can make various additions and changes within the scope of the present invention.
For example, the shape of the enlarged diameter portion 17 is not limited to the shapes shown in FIGS. 2 (a) to 2 (d). For example, in the shape of FIG. 2 (a), the end portion of the enlarged diameter portion 17 may be a tapered surface. Good.

10 Sleeve 10a First sleeve 10b Second sleeve 11 Small diameter part 12 Large diameter part 13 Flange part 14 Seal part (joint side end part)
15 Welding end 16 Inner circumference 17 Expanded diameter 20 Gasket (metal gasket)
23 Flange part 30 Female nut (nut)
40 Male Nut 50 Tube 51 Chuck 54 Tool 55 Collet Chuck 56 Tool 60 Cylindrical Material 70 Fitting Body 100 Fitting 200 Fitting

Claims (8)

A sleeve for pipe joints, one end of which is a joint side end having a seal and a flange, and the other end of which is a welding end.
An enlarged diameter portion is formed on the inner peripheral side of a predetermined range from the welding end portion, and the inner peripheral surface of the enlarged diameter portion is coaxial with the outer peripheral surface of the welding end portion, and at least at the welding end portion. A sleeve for pipe fittings that has a predetermined inner diameter and is made of a cylindrical material. The sleeve for a pipe joint according to claim 1, wherein the enlarged diameter portion is a portion having a constant inner diameter in the axial direction. The sleeve for a pipe joint according to claim 1, wherein the enlarged diameter portion is a portion having a constant inner diameter in the axial direction, and R is formed at a corner portion. The sleeve for a pipe joint according to claim 1, wherein the enlarged diameter portion is a portion where the inner peripheral side of the welding end is chamfered and has a tapered surface of approximately 45 °. The sleeve for a pipe joint according to claim 1, wherein the enlarged diameter portion is a portion where the inner peripheral side of the welding end is tapered and has a tapered surface smaller than 45 °. A method for manufacturing a sleeve according to any one of claims 1 to 5.
The first step of forming the outer peripheral surface of the sleeve by cutting the outer peripheral portion with a lathe while grasping the outer peripheral portion of the cylindrical material with a chuck.
With the outer peripheral portion of the cylindrical material gripped by a chuck, the inner peripheral portion is machined in a predetermined range from the welding end portion, and the inner peripheral surface is coaxial with the outer peripheral surface and at least the welding end portion. In the second step of forming an enlarged diameter portion having a predetermined inner diameter,
A third step of cutting the one end side of the cylindrical material to form the seal portion of the sleeve.
Including methods. With an annular gasket,
A pipe material having a flange portion and a seal portion at one end portion, and the first and second sleeves at which the one end portions are abutted with the gasket sandwiched between them.
A female nut that is inserted through the first sleeve and has a reduced diameter portion on the inner peripheral surface of one end that engages with the flange of the first sleeve and has a threaded portion on the inner peripheral surface of the other end.
The inner peripheral surface is inserted into the second sleeve, one end of the inner peripheral surface engages with the flange portion of the first sleeve, and the outer peripheral surface has a threaded portion screwed with the threaded portion of the female nut. A pipe fitting that includes a male nut that has
A pipe fitting, wherein at least one of the first and second sleeves is a sleeve for a pipe fitting according to any one of claims 1 to 5. A sleeve, which is a pipe material with a flange and a seal at one end,
An annular gasket abutting on the one end of the sleeve and
A joint body having a seal portion at one end and a threaded portion on the outer peripheral surface, the one end of which is abutted against one end of the sleeve with the gasket in between.
It is inserted into the sleeve, and the reduced diameter portion of the inner peripheral surface of one end engages with the flange portion of the sleeve, and the inner peripheral surface of the other end has a threaded portion screwed into the threaded portion of the joint body. A pipe fitting that includes a female nut,
A pipe joint according to any one of claims 1 to 5, wherein the sleeve is a sleeve for a pipe joint.

Images