JP2003343774A - Joint for tube material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint tube material capable of improving the workability of nut tightening and preventing damage of a joint body. <P>SOLUTION: The friction torque received by a first end surface part 32 of a control ring 30 from the peripheral edge part 25 of a female screw hole 21 of a nut member 20 when the nut member 20 is tightened is larger than the friction torque received by a second end surface part 34 of the control ring 30 from a stopper part 17 of the joint body 10, and the nut member 20 and the control ring 30 securely rotate together at the final stage of tightening of the nut member 20. In this way, an initial tightening position of the nut member 20 is properly determined. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is to fit one end of a tube member inserted into a female screw hole of a nut member onto a joint body and tighten the female screw of the nut member to a male screw of the joint body. The present invention relates to a tube material joint adapted to support one end of a tube material. In particular, the present invention relates to a resin joint of a tube material that controls a flow path of a pure water cleaning liquid and other chemical liquids used in a clean room at a manufacturing site of high-density semiconductor chips.

[0002]

2. Description of the Related Art As a conventional tube joint, for example, there is one disclosed in Japanese Patent Laid-Open No. 7-243564.

That is, when the nut is tightened into the joint main body, both ends of the resin spacer come into contact with the joint main body and the nut, and the spacer is turned by a finger so that the spacer cannot be rotated. Position, and even if the nut is rotated too far past the tightening end position with a tightening tool such as a wrench, the nut presses the resin spacer and deforms it, so excessive stress does not occur in the screw part and the joint body is damaged. It is possible to finish the tightening work of the nut without performing the operation.

Further, in the publication, when both end surfaces of a resin spacer contact the joint body surface and the nut end surface, respectively,
Due to the difference in friction torque acting on both end surfaces of the resin spacer, the resin spacer begins to rotate together with the nut, and the movement of the outer shape of the resin spacer in the rotational direction allows the operator to easily visually check it and tighten the nut. What can be terminated is disclosed.

[0005]

However, in such a conventional tube material joint, at the final stage of tightening the nut, each time the nut is tightened little by little, the resin spacer is rotated by turning with a finger. It is necessary to check whether or not this is the case, and the work of tightening the nut is troublesome, and the workability is not good. Also, if the friction torque acting on the resin spacer from the nut side is larger than the friction torque acting on the resin spacer from the joint body side, the resin spacer and the nut will start to rotate together to tighten the nut. However, if the friction torque acting on the resin spacer from the nut side is smaller than the friction torque acting on the resin spacer from the joint body side, on the other hand, at the final stage of tightening the nut, The spacer and the nut do not always rotate together.Therefore, the nut may not be tightened sufficiently or may be tightened too much, resulting in a problem.In particular, in the case of resin fitting, tighten the nut unlike the metal fitting. There is also a problem that the nut is only tightened and the joint body may be damaged if the nut is tightened too much.

The present invention has been made by paying attention to the problems of the prior art as described above. By reliably rotating the nut member and the control ring together at the final stage of tightening the nut member. In addition, it is possible to determine a proper initial tightening position of the nut member, improve the workability of tightening the nut, and provide a tube material joint capable of preventing damage to the joint body. Has an aim.

[0007]

The gist of the present invention for achieving the above object resides in the inventions of the following items. [1] One end of the tube member (T) inserted into the female screw hole (21) of the nut member (20) is attached to the joint body (10).
Of the tube member (T) adapted to support one end of the tube member (T) by externally fitting the nut member (20) into the male screw (13) of the joint body (10). In the joint, it is externally fitted to the male screw (13) of the joint body (10) and is formed on the inner side of the male screw (13) of the joint body (10) when the nut member (20) is tightened. A stopper portion (17) which is a circumferential flange and a female screw hole (21) of the nut member (20).
It is provided with a control ring (30) capable of adjusting the tightening strength of the nut member (20) by being sandwiched by the peripheral portion (25) of the control ring (3).
0) is a peripheral edge portion (2) of the female screw hole (21) of the nut member (20) when the nut member (20) is tightened.
5) having a first end surface portion (32) which comes into contact with the stopper body (17) of the joint body (10), and a second end surface portion (34) which comes into contact with the stopper portion (17) of the joint body (10). ), When the nut member (20) is tightened, the second end surface portion (34) receives the friction torque that the first end surface portion (32) receives from the peripheral edge portion (25) of the female screw hole (21). A tube member (T) characterized in that the nut member (20) and the control ring (30) are formed so as to rotate together by making the friction torque larger than the friction torque received from the stopper portion (17). Fittings.

[2] Female screw hole (2) of the nut member (20)
1) By externally fitting one end of the tube material (T) inserted into the joint body (10) and tightening the female screw of the nut member (20) with the male screw (13) of the joint body (10). A joint of a tube material (T) adapted to support one end of the tube material (T), the joint body (10)
Of the nut member (2)
0) when tightening, the stopper portion (17) which is a circumferential flange formed on the inner side of the male screw (13) of the joint body (10) and the female screw hole (21) of the nut member (20). By being sandwiched by the peripheral part (25) of
A control ring (30) capable of adjusting the tightening strength of the nut member (20) is provided, and the control ring (30) is a female screw hole of the nut member (20) when the nut member (20) is tightened. A first end surface portion (32) that contacts the peripheral edge portion (25) of (21) and a second end surface portion (34) that contacts the stopper portion (17) of the joint body (10); The first end face portion (32)
Is the friction coefficient between the first end face portion (32) and the peripheral edge portion (25) of the female screw hole (21), and the second end face portion (3).
4) and the friction coefficient between the stopper portion (17) are made larger, so that the nut member (20) and the control ring (30) rotate together when the nut member (20) is tightened. A tube material (T) joint characterized by being formed in the following manner.

[3] Female screw hole (2) of the nut member (20)
1) By externally fitting one end of the tube material (T) inserted into the joint body (10) and tightening the female screw of the nut member (20) with the male screw (13) of the joint body (10). A joint of a tube material (T) adapted to support one end of the tube material (T), the joint body (10)
Of the nut member (2)
0) when tightening, the stopper portion (17) which is a circumferential flange formed on the inner side of the male screw (13) of the joint body (10) and the female screw hole (21) of the nut member (20). By being sandwiched by the peripheral part (25) of
A control ring (30) capable of adjusting the tightening strength of the nut member (20) is provided, and the control ring (30) receives friction from the female screw hole (21) when the nut member (20) is tightened. By making the torque larger than the friction torque received from the stopper portion (17), the nut member (20) and the control ring (30) are formed so as to rotate together, and the outer peripheral edge of the control ring (30) is formed. A joint for a tube material (T), characterized in that mark portions (36) are continuously provided at predetermined intervals in the circumferential direction of the outer peripheral edge (38) at (38).

[4] The first end face portion (32) is formed along the circumferential direction of the peripheral edge portion (25) of the female screw hole (21), and the second end face portion (34) is the stopper. The first end surface portion (32) is formed along the circumferential direction of the portion (17), and has a larger diameter than the second end surface portion (34) [1] ], [2] or the joint of the tube material (T) according to [3].

[5] The first end surface portion (32) is formed along the circumferential direction of the peripheral edge portion (25) of the female screw hole (21), and the second end surface portion (34) is the stopper. The first end face portion (32) is formed along the circumferential direction of the portion (17), and the first end face portion (32) has the female screw hole (2).
The sum of the products of the first reaction force received from the peripheral edge portion (25) of (1) and the distance from the center of the control ring (30) to the portion receiving the first reaction force is the second end surface portion (3).
4) is formed so as to be larger than the sum of the products of the second reaction force in contact with the stopper (17) and the distance from the center of the control ring (30) to the portion receiving the second reaction force. The joint of the tube material (T) according to [1], [2] or [3].

[6] The outer peripheral edge (38) of the control ring (30) is formed such that the diameter of the outer peripheral edge (38) is larger than the outer diameter of the nut member (20), and the mark portion ( 36) is the control ring (30)
The joint of the tube material (T) according to [1], [2] or [3], which is a notch (36) formed in the outer peripheral edge (38) of the.

[7] The control ring (30)
Is formed into a substantially C-shape with a part thereof opened, and the joint of the tube material (T) according to any one of [1] to [6].

Next, the operation of the present invention will be described. One end of the tube material (T) is inserted into the female screw hole (21) of the nut member (20), and one end of the tube material (T) is externally fitted to the joint body (10) to remove the nut member (20). By tightening the female screw into the male screw (13) of the joint body (10),
It is adapted to support one end of the tube material (T). Further, the control ring (30) is the joint body (1
It is externally fitted to the male screw (13) of 0).

As the nut member (20) is tightened,
The control ring (30) includes a stopper portion (17) of the joint body (10) and a female screw hole (2) of the nut member (20).
The first end surface portion (32) of the control ring (30) comes into contact with the peripheral edge portion (25) of the female screw hole (21) of the nut member (20) so as to be sandwiched by the hole peripheral edge of (1), and the joint is formed. The second end surface portion (34) of the control ring (30) contacts the stopper portion (17) of the main body (10).

When tightening the nut member (20),
The first end surface portion (32) is a peripheral edge portion (2) of the female screw hole (21).
5) so that the friction torque received from the second end surface portion (34) is larger than the friction torque received from the stopper portion (17). The first end surface portion (32) and the second end surface portion (34).
The nut member (20) and the control ring (30) rotate together with each other. This co-rotation is a phenomenon that occurs when the tightening strength of the nut member (20) is in an appropriate state. After confirming the co-rotation state, the tightening work of the nut member (20) is completed. By doing so, an appropriate initial tightening position of the nut member (20) can be determined, and the nut member (2
0) tightening work can be done easily and surely,
It is possible to prevent a problem due to insufficient tightening or excessive tightening of the nut member (20), and particularly to prevent damage to the joint body (10) due to excessive tightening.

Specifically, the first end surface portion (32) is formed along the circumferential direction of the peripheral edge portion (25) of the female screw hole (21), and the second end surface portion (34) is the stopper portion (17). The first end face portion (32) when formed along the circumferential direction of
The diameter may be larger than that of the second end surface portion (34). Thereby, the first reaction force that the first end face portion (32) receives from the peripheral edge portion (25) of the female screw hole (21) is the second reaction force.
The end surface portion (34) acts on a position farther from the center of rotation of the control ring (30) than the second reaction force received from the stopper portion (17). Further, because of the relationship between the action and the reaction, the first reaction force and the second reaction force are the same,
The friction torque based on the first reaction force becomes larger than the friction torque based on the second reaction force. Thereby, the nut member (20)
When tightening, the nut member (20) and the control ring (30) rotate together.

The first end face portion (32) is not limited to this, and the first end face portion (32) has a peripheral edge portion (2) of the female screw hole (21).
5) The first reaction force received from the control ring (3)
0) from the center of the control ring (30) to the total of the product of the distance from the center of the control ring (30) to the distance from the center of the control ring (30) to the stopper (17). It may be formed so as to be larger than the total sum of the product of the two reaction forces and the distance.

Although the shapes and positions of the first end face portion (32) and the second end face portion (34) are specified for the purpose of co-rotation, the nut member (20) and the control ring (30) are specified. ) And the material of the joint body (10), respectively, to select the first end face portion (32) and the female screw hole (2).
The coefficient of friction with the peripheral portion (25) of 1) may be made larger than the coefficient of friction between the second end surface portion (34) and the stopper portion (17). Thereby, when tightening the nut member (20), the nut member (20) and the control ring (30) may rotate together.

It can be seen that the nut member (20) and the control ring (30) rotate together so that the tightening strength of the nut member (20) is in an appropriate state, but the nut member (20) is tightened. The nut member (20) and the control ring (30) are used to make the insertion work more reliable.
It is necessary to clarify how co-rotated with and.
This includes the outer edge (3) of the control ring (30).
Markers (36) may be provided continuously at a predetermined interval in 8). When the mark part (36) rotates together with the control ring (30) during the co-rotation, and how much the mark part (36) rotates, the extent of the nut member (20) and the control ring (30) can be determined. You can easily check if you have co-rotated.

The control ring (30) is sandwiched between both the nut member (20) and the stopper portion (17) of the joint body (10) and is likely to be a shadow of both, and the mark portion (36) thereof. Is difficult to see, and sometimes the degree of co-rotation cannot be easily confirmed.

Therefore, first, the outer peripheral edge (38) forming the outer periphery of the first end face portion (32) is formed so that the diameter of the outer peripheral edge (38) is larger than the outer diameter of the nut member (20). Further, the notches (36) may be continuously provided on the outer peripheral edge (38) of the first end face portion (32) at predetermined intervals in the circumferential direction of the outer peripheral edge (38). Thereby, the notch (36)
Becomes conspicuous without being a shadow of the both, and the degree of co-rotation can be easily confirmed.

Here, the control ring (30) is
Generally, the shape is a closed ring shape, but it may be a substantially C-shape shape with a part opened. By making the control ring (30) substantially C-shaped, the nut member (2
It is easy to pull out the control ring (30) from the gap between the nut member (20) and the stopper portion (17) of the joint body (10) after the tightening work of (0) is completed. In addition, the open portion of the control ring (30) can be used as a mark portion (36) for confirming the degree of co-rotation.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. Each drawing shows one embodiment of the present invention. FIG. 1 is a cross-sectional view of a main part of a tube material joint according to an embodiment of the present invention. 2 is a view of the control ring according to the present embodiment as viewed from the direction II of FIG. 1, and FIG. 3 is a view of the same as viewed from the direction III of FIG.

As shown in FIGS. 1 to 3, the present tube material T
The joint is composed of a joint body 10 made of fluororesin and a nut member 20 made of fluororesin as well. Examples of the fluororesin include "PTFE (polytetrafluoroethylene)" and "PFA (tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer)" which have excellent chemical resistance.

The nut member 20 is a so-called cap nut, and has a back wall 22 which is a bag portion orthogonal to the screw axis on the back side of the female screw hole 21. A female screw portion 23 is engraved on the inlet side of the female screw hole 21 of the nut member 20, and an insertion hole 24 for inserting the tube material into the female screw hole 21 from the back wall 22 side is formed in the inner wall 22 of the nut member 20. It is set up.

The nut member 20 has a tightened portion 27 having a substantially hexagonal cross section, and a nut tightening tool (wrench) is attached to the tightened portion 27.
It is designed to fit in. The joint body 10 has a tip portion 11 inserted into the inner side of the female screw hole 21 of the nut member 20.
An external fitting portion 12 is formed on the. The external fitting portion 12 includes
One end of the tube material T inserted into the female screw hole 21 through the insertion hole 24 of the nut member 20 is externally fitted in a state in which the diameter is expanded. Therefore, the one end portion of the tube material T inserted into the female screw hole 21 is expanded with the general outer diameter portion T1, the large diameter expanded portion T2 that is externally fitted to the external fitting portion 12, and the general outer diameter portion T1. It is composed of a stepped portion T3 (or a flare) which is an intermediate portion connecting the diameter portion T2.

At the tip portion 11 of the joint body 10, a male screw 13 that is screwed into the female screw portion 23 is engraved following the external fitting portion 12. The diameter of the thread of the female threaded portion 23 of the nut member 20 screwed into the male thread 13 and the hole inner peripheral wall 21a of the female threaded hole 21 of the nut member 20 allow the enlarged diameter portion T2 of the tube material T to be relatively inserted. Moreover, it is set to be slightly larger than the outer diameter of the expanded diameter portion T2 so that the diameter of the screw thread or the like is minimized.

A stopper portion 17 having a substantially hexagonal cross section is provided on the inner side of the male screw 13 of the joint body 10. Joint body 1
The base end portion of 0 forms an elbow portion bent in an L shape. The joint body 10 is provided with a through hole 14 having a hole diameter substantially the same as the inner diameter of the tube material T and penetrating in the screw axis direction.

In this embodiment, the elbow portion is formed at the base end portion of the joint body 10, but the present invention is not limited to this. That is, the base end portion of the joint body 10 may be straight without being bent in the L shape, and the through hole 14
May be formed in a T-shape.

With the tip 11 of the joint body 10 inserted into the inner side of the female screw hole 21 of the nut member 20, the inner wall 22 of the nut member 20 and the rim 15 of the through hole 14 of the joint body 10 are separated from each other. Opposite on a direction line parallel to the screw axis. A chamfered inclined surface portion 19 is provided on the outer peripheral edge of the rim portion 15 of the through hole 14 so that one end portion of the tube material T can be easily fitted and the stable airtightness can be maintained. Further, a chamfered slope portion 19a is provided on the inner peripheral edge of the mouth edge portion 15 to prevent the accumulation of the liquid as the moving medium.

Further, the externally fitted portion 12 of the distal end portion 11 of the joint body 10 to which one end of the tube material T is externally fitted is opposed to the tightening force of the nut member 20 to minimize its deformation in the diameter reducing direction. In order to prevent the relaxation of the sealing force, it has sufficient thickness and has the required rigidity. On the other hand, the back wall 22 of the nut member 20 is directed toward the center of the insertion hole 24 (axial center of the screw shaft) in the direction of the rim portion 15 of the through hole 14 of the joint body 10 (inlet direction of the screw hole). The biting portion 22a is inclined at a predetermined angle (25 to 35 degrees).

When the nut member 20 is tightened, the control ring 30 is fitted on the male screw 13 of the joint body 10. The control ring 30 is a substantially open C
It is formed in a letter shape. The open portion 39 is externally fitted from a direction orthogonal to the screw axis of the male screw 13 of the joint body 10. The control ring 30 is capable of adjusting the tightening strength of the nut member 20 by being sandwiched between the stopper portion 17 of the joint body 10 and the hole periphery of the female screw hole 21 of the nut member 20.

As the material of the control ring 30,
Synthetic resins such as polypropylene resin, polyethylene resin and polyvinyl chloride resin are used. Also, PVF,
PVDF, ECTFE, PCTFE, ETFE, FE
A fluororesin such as P, PFA or PTFE may be used.

The control ring 30 includes the nut member 2
When tightening 0, the first end surface portion 32 that comes into contact with the peripheral edge portion 25 of the female screw hole 21 of the nut member 20 and the joint body 1
The second end face portion 34 that contacts the stopper portion 17 of No. 0.

When the nut member 20 is tightened, the first end surface portion 32 has a periphery 25 of the female screw hole 21.
The second end surface portion 34 receives the friction torque received from the stopper portion 1
It is formed so that the nut member 20 and the control ring 30 rotate together by making the friction torque larger than the friction torque received from 7.

Specifically, the first end surface portion 32 is formed along the circumferential direction of the peripheral edge portion 25 of the female screw hole 21, and the second end surface portion 34 is formed along the circumferential direction of the stopper portion 17. The diameter D1 of the first end face portion 32 is formed to be larger than the diameter D2 of the second end face portion 34. Further, when the width of the first end face portion 32 and the width of the second end face portion 34 are W1 and W2, respectively, a contact area S1 where the first end face portion 32 contacts the peripheral edge portion 25 of the female screw hole 21 (hatched in FIG. 2). (Shown) is about πD1 · W1 and the second end face 34
The contact area S2 (indicated by hatching in FIG. 3) in which is contacted with the stopper portion 17 is about πD2 · W2.

The second end surface portion 34 of the control ring 30
A step portion 35 is formed in the. The step portion 35 is located in the large diameter portion of the second end surface portion 34, and is retracted from the stopper portion 17 so as not to come into contact with the stopper portion 17. As a result, the portion of the second end surface portion 34 that comes into contact with the stopper portion 17 has a small diameter. Also, the control ring 30
The inner peripheral surface 37 of the male thread 13 and its neck 13a.
A first inner peripheral surface 37a and a second inner peripheral surface 37b are formed so as to be fitted onto (portions having a smaller diameter than the male screw 13).

Next, the operation of this embodiment will be described. One end of the tube material T has an insertion hole 2 for the nut member 20.
4 is inserted into the female screw hole 21 through
The enlarged diameter portion T2 at one end of is fitted onto the fitted portion 12 which is the tip portion 11 of the joint body 10. The stepped portion T3 applied to the enlarged diameter portion T2 of the tube material T in a state where the diameter is expanded from the general outer diameter portion T1 is a chamfered slope portion 1 of the external fitting portion 12 of the joint body 10.
It extends diagonally along 9. When the tip portion 11 of the joint body 10 is inserted into the inner side of the female screw hole 21 of the nut member 20, the starting end of the male screw 13 of the joint body 10 contacts the starting end of the female screw portion 23 of the nut member 20. At this time, the enlarged diameter portion T2 of the tube material T is inserted into the female screw hole 21 of the nut member 20 (the screw thread of the female screw portion 23 or the hole inner peripheral wall 21a of the female screw hole 21) with a slight gap or through the female screw hole. While slidingly contacting 21, it is relatively inserted.

When the tightening tool is fitted into the tightened portion 27 of the nut member 20 and the tightening tool is likewise fitted into the stopper portion 17 of the joint body 10 and they are relatively rotated, The nut member 20 is attached to the male screw 13 of the main body 10.
The female screw portion 23 of is screwed. When the female screw portion 23 of the nut member 20 is completely screwed to the male screw 13 of the joint body 10, the biting portion 22a of the back wall 22 of the nut member 20 is formed.
Can cut into the step T3 of the tube material T and prevent the tube material T from coming off. Furthermore, since the tube material T and the chamfered slope portion 19 of the joint body 10 are pressed against each other, high airtightness can be obtained.

One end of the tube material T is inserted into the female screw hole 21 of the nut member 20, the one end portion of the tube material T is externally fitted to the joint body 10, and the female screw of the nut member 20 is attached to the male screw 13 of the joint body 10. By tightening, one end of the tube material T is supported. The control ring 30 is externally fitted on the male screw 13 of the joint body 10.

Before the tightening operation of the nut member 20, the open portion 39 of the control ring 30 is fitted onto the male screw 13 from the direction orthogonal to the screw axis of the male screw 13 of the joint body 10. Next, when the female screw portion 23 of the nut member 20 is tightened into the male screw 13 of the joint body 10, the control ring 30 is sandwiched between the stopper portion 17 of the joint body 10 and the hole peripheral edge of the female screw hole 21 of the nut member 20. As a result, the first end surface portion 32 of the control ring 30 comes into contact with the peripheral edge portion 25 of the female screw hole 21 of the nut member 20, and the stopper portion 1 of the joint body 10 eventually comes into contact.
The second end surface portion 34 of the control ring 30 comes into contact with 7.

When tightening the nut member 20, the first
The friction torque that the end surface portion 32 receives from the peripheral edge portion 25 of the female screw hole 21 becomes larger than the friction torque that the second end surface portion 34 receives from the stopper portion 17, so that the nut member 20 and the control ring 30 rotate together. The tightening strength of the nut member 20 becomes appropriate.

Specifically, since the diameter of the first end surface portion 32 is formed to be larger than that of the second end surface portion 34,
The first end face portion 32 receives from the peripheral edge portion 25 of the female screw hole 21.
The reaction force acts on a position farther from the rotation center of the control ring 30 than the second reaction force received by the second end surface portion 34 from the stopper portion 17.

The first reaction force and the second reaction force are F1 and F2, respectively, and the reaction forces F1 and F2 from the center of rotation of the control ring 30.
If the distances to the position where is applied are R1 and R2, and the friction coefficients related to the first end surface portion 32 and the second end surface portion 34 are both μ, the friction torque based on the first reaction force is ΣμF1 · R1. The friction torque based on the second reaction force is ΣμF2 · R2
Becomes

Here, the friction coefficient μ is a static friction coefficient, and the friction torque based on the first reaction force F1 is the first end face 3
2 receives the first reaction force F1 from the peripheral edge portion 25 of the female screw hole 21.
And the center of the control ring 30 (center of rotation)
The frictional torque based on the second reaction force F2 is the sum of the product of the distance R1 to the portion receiving the reaction force F1 and the friction torque based on the second reaction force F2.
4 is the sum of the products of the second reaction force F2 in contact with the stopper 17 and the distance R2 from the center of the control ring 30 to the portion receiving the second reaction force F2.

When the nut member 20 is tightened, the first reaction force and the second reaction force are the same (F1 = F2) due to the relationship between the action and the reaction, and since R1> R2, the first The friction torque (ΣμF1 · R1) based on the reaction force becomes larger than the friction torque (ΣμF2 · R2) based on the second reaction force, and the second end surface portion 34 first starts to slide with respect to the stopper portion 17, whereby the nut When the member 20 is tightened, the nut member 20 and the control ring rotate together.

Nut member 20 and control ring 30
If the tightening operation of the nut member 20 is completed after confirming the co-rotating state with the nut member 20, the proper initial tightening position of the nut member 20 can be determined, and the tightening operation of the nut member 20 is easy. And it can be done reliably. In addition, it is possible to prevent problems caused by insufficient tightening of the nut member 20 or excessive tightening, and particularly, the nut member 20.
It is possible to prevent the joint body 10 from being damaged by over-tightening.

When the nut member 20 and the control ring 30 rotate together, the open portion 39 of the control ring 30 serves as a mark, and the nut member 20 and the open portion 39 of the control ring 30 rotate together. As a result, it is clear how much the nut member 20 and the control ring 30 are rotated together, whereby the tightening operation of the nut member 20 can be performed more reliably.

Although the tube joint can be used after the tightening work of the nut member 20 is completed, the force for supporting the tube material may decrease in a long-term use, so that the supporting force should be prevented from decreasing. It is necessary to re-tighten the nut member 20 after using it for a predetermined period. Nut member 20
It is necessary to remove the control ring 30 from the male screw 13 of the joint body 10 when re-tightening. At this time, if the male screw 13 of the joint body 10 is relatively passed through the gap between the open portions 39 of the control ring 30, the control ring 30 can be easily pulled out from the male screw 13 of the joint body 10.

On the other hand, when the nut member 20 is retightened, a control ring 30 for retightening may be interposed in the gap between the nut member 20 and the stopper 17.
Even when the nut member 20 is retightened, the nut member 20
Set so that the control ring 30 and the control ring 30 always rotate together.

In the above embodiment, the diameter of the first end surface portion 32 of the control ring 30 is made larger than that of the second end surface portion 34 so that the nut member 20 and the control ring 30 always rotate together. I showed what I did,
If the friction coefficients of the first end surface portion 32 and the second end surface portion 34 are μ1 and μ2 (μ1> μ2), then R1 = R
Even if it is 2, the friction torque based on the first reaction force (Σμ1.
F1 · R1) is the friction torque (Σμ2) based on the second reaction force.
F2 · R2), which allows the nut member 20 and the control ring to rotate together when tightening the nut member 20.

Further, as shown in FIGS. 4 to 6, the outer peripheral edge 38 of the control ring 30 may be continuously provided with mark portions at predetermined intervals in the circumferential direction. Specifically, the notches that form the outer periphery of the first end surface portion 32 and have a diameter that is larger than the outer diameter of the nut member 20 and that are mark portions at predetermined intervals in the circumferential direction of the outer peripheral edge 38. 36 may be connected in series.

Nut member 20 and control ring 30
The cutout 36 rotates integrally with the control ring 30 when and rotate together. Specifically, the notch 36 changes from the state before co-rotation shown in FIG. 6A to the state after co-rotation shown in FIG. 6B. By observing the degree of rotation of the notch 36 (angle of about 45 degrees in FIG. 6), it is possible to easily confirm how much the nut member 20 and the control ring 30 are rotated together. Also, the nut member 2
By providing the notch 36 on the outer peripheral edge 38 larger than the outer diameter of 0, the notch 36 becomes conspicuous without being shaded by both the nut member 20 and the stopper portion 17, and the degree of co-rotation can be easily confirmed. can do.

Further, FIGS. 7 and 8 show a modification of the above embodiment, and FIG. 7 is a front view of the control ring,
FIG. 8 shows a sectional view taken along the line VIII-VIII of FIG. 7. Also,
9 and 10 show another modification of the above-described embodiment, which is a front view of the control ring, and FIG.
The X-ray sectional view is shown.

As shown in FIGS. 7 to 10, the second end face portion 3
4, the step portion 35 is not formed as in the above embodiment. In this control ring 30, the first end surface portion 3
The maximum diameters of the second and second end surface portions 34 are substantially the same, while the minimum diameter of the second end surface portion 34 is smaller than the minimum diameter of the first end surface portion 32. Thereby, the first end face portion 32 of the control ring 30 receives the first reaction force F1 from the peripheral edge portion 25 of the female screw hole 21 against the second end face portion 34.
The large-diameter portion of the first end face portion 32 is intensively received.

As a result, the friction torque based on the first reaction force becomes larger than the friction torque based on the second reaction force, the second end surface portion 34 first begins to slide with respect to the stopper portion 17, and the nut member 20 is tightened. At times, the nut member 20 and the control ring rotate together.

[0058]

As described above, in the tube material joint according to the present invention, when the nut member is tightened,
Since the friction torque received by the first end face of the control ring from the peripheral edge of the female screw hole of the nut member is made larger than the friction torque received by the second end face of the control ring from the stopper part of the joint body, tightening the nut member At the final stage of tightening, the nut member and the control ring will surely rotate together, the proper initial tightening position of the nut member can be determined, and the workability of tightening the nut can be improved. At the same time, damage to the joint body can be prevented.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a main part of a tube material joint according to an embodiment of the present invention.

FIG. 2 is a view of the control ring according to the embodiment of the present invention when viewed from the direction II in FIG.

FIG. 3 is a view of the control ring according to the embodiment of the present invention when viewed from the direction III in FIG.

FIG. 4 is a front view of a control ring according to another embodiment of the present invention.

5 is a sectional view taken along line VV of FIG.

FIG. 6 is an explanatory diagram showing a state before and after a control ring according to another embodiment of the present invention co-rotates,
(A) shows the state before co-rotation, and (b) shows the state after co-rotation.

FIG. 7 is a front view of a control ring according to a modified example of the embodiment of the present invention.

8 is a sectional view taken along line VIII-VIII of FIG.

FIG. 9 is a front view of a control ring according to another modification of the embodiment of the present invention.

10 is a cross-sectional view taken along line XX of FIG.

[Explanation of symbols]

S1 ... Contact area S2 ... Contact area T ... Tube material T1 ... General outer diameter part T2 ... Expanded part T3 ... step 10 ... Fitting body 11 ... Tip 12 ... Fitted part 13 ... Male screw 13a ... neck 14 ... Through hole 15 ... rim 17 ... Stopper 19a ... Chamfered slope 20 ... Nut member 21 ... Female screw hole 21a ... Hole inner peripheral wall 22 ... Back wall 22a ... biting part 23 ... Female thread 24 ... Insertion hole 27 ... Tightened part 30 ... Control ring 32 ... First end face portion 34 ... Second end face portion 35 ... Step 36 ... Notch 37 ... Inner peripheral surface 37a ... 1st inner peripheral surface 37b ... second inner peripheral surface 38 ... Outer periphery 39 ... Opened part

Claims (7)

[Claims] Claim: What is claimed is: 1. One end of a tube member inserted into a female screw hole of a nut member is externally fitted to a joint main body, and the female screw of the nut member is screwed into a male screw of the joint main body so that one end of the tube member is In a tube material joint that is adapted to be supported, it is a flange of a circumferential shape that is externally fitted to the male screw of the joint body and is formed on the inner side of the male screw of the joint body when the nut member is tightened. By being sandwiched between the stopper portion and the peripheral edge portion of the female screw hole of the nut member, a control ring is provided that can adjust the tightening strength of the nut member, and the control ring is the nut when tightening the nut member. A first end surface portion that contacts the peripheral edge portion of the female screw hole of the member; and a second end surface portion that contacts the stopper portion of the joint body, wherein the first end surface portion is When tightening the nut member, the friction torque that the first end surface portion receives from the peripheral edge portion of the female screw hole is made larger than the friction torque that the second end surface portion receives from the stopper portion, so that the nut member and the control ring. A tube material joint, characterized in that it is formed so as to co-rotate with. 2. A tube member inserted into an internal threaded hole of a nut member is externally fitted to one end of a joint body, and the female screw of the nut member is screwed into an external thread of the joint body, thereby fixing one end of the tube member. In a tube material joint that is adapted to be supported, it is a flange of a circumferential shape that is externally fitted to the male screw of the joint body and is formed on the inner side of the male screw of the joint body when the nut member is tightened. By being sandwiched between the stopper portion and the peripheral edge portion of the female screw hole of the nut member, a control ring is provided that can adjust the tightening strength of the nut member, and the control ring is the nut when tightening the nut member. A first end surface portion that contacts the peripheral portion of the female screw hole of the member; and a second end surface portion that contacts the stopper portion of the joint body, wherein the first end surface portion is By setting the friction coefficient between the first end surface portion and the peripheral portion of the female screw hole to be larger than the friction coefficient between the second end surface portion and the stopper portion, the nut member is tightened when the nut member is tightened. A tube material joint, characterized in that the control ring and the control ring co-rotate. 3. One end of the tube member is fitted by externally fitting one end of a tube member inserted into the female screw hole of the nut member onto the joint body and tightening the female screw of the nut member to the male screw of the joint body. In a tube material joint that is adapted to be supported, it is a flange having a circumferential shape that is externally fitted to the male screw of the joint body and is formed on the inner side of the male screw of the joint body when the nut member is tightened. A control ring is provided that is capable of adjusting the tightening strength of the nut member by being sandwiched by the stopper portion and the peripheral edge portion of the female screw hole of the nut member, and the control ring is configured to tighten the female screw hole when tightening the nut member. By making the friction torque received from the hole larger than the friction torque received from the stopper portion, the nut member and the control ring rotate together. Are formed on so that, the outer peripheral edge of said control ring,
A joint for tube material, characterized in that mark portions are continuously provided at predetermined intervals in the circumferential direction of the outer peripheral edge. 4. The first end surface portion is formed along the circumferential direction of the peripheral edge portion of the female screw hole, and the second end surface portion is formed along the circumferential direction of the stopper portion. The tube material joint according to claim 1, 2 or 3, wherein the first end surface portion is formed to have a diameter larger than that of the second end surface portion. 5. The first end surface portion is formed along the circumferential direction of the peripheral edge portion of the female screw hole, the second end surface portion is formed along the circumferential direction of the stopper portion, The first end surface portion has a sum of a product of a first reaction force received by the first end surface portion from a peripheral portion of the female screw hole and a distance from a center of the control ring to a portion receiving the first reaction force, The second end face portion is formed so as to be larger than a sum of products of a second reaction force in contact with the stopper and a distance from a center of the control ring to a portion receiving the second reaction force. Item 5. A tube material joint according to Item 1, 2 or 3. 6. An outer peripheral edge of the control ring is formed such that a diameter of the outer peripheral edge is larger than an outer diameter of the nut member, and the mark portion is a notch formed in the outer peripheral edge of the control ring. The joint of the tube material according to claim 1, 2 or 3, wherein 7. The control ring is formed in a substantially C shape with a part thereof opened.
The joint of the tube material as described in any one of to 6.