KR100630544B1 - Pipe joint - Google Patents

Abstract

The present invention relates to a pipe joint, which has a main body portion and an outer cylinder portion which are mutually screwed together, an inner cylinder portion for extending the pipe outside is installed in the main body portion, and a sleeve is housed in the inner circumferential portion of the outer cylinder portion in a state where the sleeve is prevented from being pulled out. Is pressed and fixed between the sleeve of the anti-separation state and the inner cylinder portion of the main body portion, and this pipe joint is accommodated in the inner circumferential portion of the outer cylinder portion which is screwed with the main body portion in a state where the sleeve is prevented from being pulled out, The sleeve is not dropped even when the main body and the outer cylinder are separated.

Description

Pipe joint {PIPE JOINT}

1 is a partial cross-sectional view illustrating Embodiment 1 of a pipe joint of the present invention;

2 is a partial cross-sectional view illustrating a state before assembly of the pipe joint of FIG. 1;

3 is a partial cross-sectional view illustrating a state of use of the pipe joint of FIG. 1;

4 is a partial cross-sectional view illustrating a second embodiment of the pipe joint of the present invention;

5 is a partial cross-sectional view illustrating a state before assembling the pipe joint of FIG. 4;

6 is a partial cross-sectional view illustrating a state of use of the pipe joint of FIG. 4;

7 is a partial cross-sectional view for explaining a third embodiment of the pipe joint of the present invention;

8 is a partial cross-sectional view illustrating a state before assembling the pipe joint of FIG. 7.

9 is a partial cross-sectional view illustrating a state of use of the pipe joint of FIG. 7;

10 is a sectional view for explaining a fourth embodiment of the pipe joint of the present invention;

11 is a partial cross-sectional view illustrating a conventional pipe joint;

12 is a partial cross-sectional view illustrating a state in which the main body and the outer cylinder of the pipe joint of FIG. 11 are separated;

FIG. 13 is a partial cross-sectional view illustrating a use state of the pipe joint of FIG. 11.

* Explanation of symbols for main parts of the drawings

T1: 1st taper surface T2: 2nd taper surface

J1: center axis J2: center axis

1: piping 2: main body

3: outer tube 4: inner tube

8: sleeve 9: snap ring

10: pipe insertion hole 10a: cylindrical portion

11: Annular member to prevent the sleeve from coming off

The present invention relates to a pipe joint for connecting and using a fluid pipe.

Background Art Conventionally, pipe joints are known in which pipes such as fluorine resins and synthetic resins are connected to allow fluids such as air, water, and chemicals to flow. For example, the NITTA MOORE COMPANY homepage, "Product Information Chemipit Joint CS Series", [online], [Search for 5/28/2003], Internet <URL: http://www.nittamoore.co.jp./products /ci_item3.asp?i2code=48>.

As shown in FIGS. 11-13, this pipe joint consists of a main body 21 and the outer cylinder part 22 screwed together. In the main body portion 21, an inner cylinder portion 25 having an expansion portion 24 covering the pipe 23 is provided. In addition, a sleeve 26 is inserted between the outer cylinder portion 22 and the inner cylinder portion 25. Then, when the pipe 23 is inserted and the main body 21 and the outer cylinder 22 are screwed together, the pipe 23 is pressed and fixed between the inner cylinder 25 and the sleeve 26.

However, when the main body part 21 and the outer cylinder part 22 were disconnected at the time of the piping 23 connection work, there was a problem that the sleeve 26 was dropped and lost. In addition, when the sleeve 26 has an asymmetrical structure, the mounting direction may be incorrectly installed in the reverse direction. This cannot effectively exhibit the performance of the pipe joint.

Therefore, an object of the present invention is to provide a pipe joint with better handling of a sleeve than in the prior art.

In order to solve the above problems, the present invention seeks the following technical means.

(1) The pipe joint of the present invention has a main body portion and an outer cylinder portion which are mutually screwed together, and the inner cylinder portion for extending the pipe is installed in the main body portion, and the sleeve is received in the inner circumferential region of the outer cylinder portion in a state of preventing the sleeve from being pulled out. The pipe is characterized in that the press-fit between the sleeve and the inner cylinder portion of the main body portion to prevent the release.

This tube joint is accommodated in the inner circumferential region of the outer cylinder portion screwed with the main body portion in a state where the sleeve is prevented from being pulled out, so that the sleeve does not fall off even when the main body portion and the outer cylinder portion are separated during the pipe connecting operation.

(2) The outer ring diameter of the sleeve is set to a diameter smaller than the inner circumferential diameter of the threaded portion of the outer cylinder portion and inserted at the threaded side of the outer cylinder portion, and a snap ring capable of elastic deformation set to a diameter slightly larger than the inner circumferential diameter of the threaded portion of the outer cylinder portion. The sleeve may be accommodated in the inner circumferential region of the outer cylinder portion in a state where the sleeve is prevented from being pulled out by being inserted at the screw portion side.

In this way, the snap ring capable of elastic deformation set to a diameter slightly larger than the inner circumferential diameter of the screw portion of the outer cylinder portion is also inserted from the screw portion so that the sleeve is received in the inner circumferential portion of the outer cylinder portion in a prevented state from being pulled out. Can be prevented from falling out.

(3) The outer circumferential diameter of the sleeve is set to a diameter larger than the inner circumferential diameter of the screw portion of the outer cylinder portion, and the sleeve is inserted at the pipe insertion port side of the outer cylinder portion, and the sleeve is inserted into the inner circumference of the outer cylinder portion by caulking the pipe insertion hole. It may be accommodated in a fall prevention state.

In this way, since the sleeve is inserted at the pipe insertion port side of the outer cylinder portion and the cock is inserted in the outer cylinder portion, the sleeve is received in the inner circumferential region in a state of preventing the sleeve from being pulled out, so that the sleeve can be reliably prevented from falling out.

(4) The pipe insertion port side may be caulked by inserting an annular member for preventing the sleeve from being pulled out together with the sleeve at the pipe insertion port side of the outer cylinder portion.

With this configuration, since the shape and dimensions of the contact portion between the sleeve and the annular member for preventing the sleeve from falling out can be produced with high precision, stable performance can be obtained.

(5) The outer circumferential diameter of the sleeve is set to a diameter larger than the inner circumferential diameter of the threaded portion of the outer cylinder portion, and the sleeve is rotatably inserted at the pipe insertion port side of the outer cylinder portion, and by caulking the cylindrical portion constituting the pipe insertion hole, The mode in which the sleeve is accommodated in the inner circumferential region and the caulking portion of the cylindrical portion is such that the inner circumferential surface of the cylindrical portion is the first tapered surface whose diameter decreases from the proximal end side to the distal end side. The outer peripheral surface has a second tapered surface whose diameter decreases toward the pipe insertion port side, and the inclination angle of the first tapered surface with respect to the central axis of the outer cylinder portion is smaller than the inclination angle of the second tapered surface with respect to the central axis of the sleeve. Or set to the same.

With this configuration, the first is generated by caulking the cylindrical portion during the operation of the screw between the body portion and the outer cylinder portion, which is pressed between the sleeve and the inner cylinder portion of the main body portion in which the pipe is accommodated in the inner circumferential region of the outer cylindrical portion. The contact traces of the tapered surface and the second tapered surface formed on the sleeve are always in contact with each other due to the position of the largest diameter portion of the first tapered surface and the second tapered surface (planar orthogonal to the central axis of the outer cylinder portion, and the central axis of the outer cylinder portion). In the same trajectory). Therefore, the sleeve rotates smoothly with respect to the outer cylinder part at the time of the operation | movement which the screw of a main body part and an outer cylinder part enters at piping connection, As a result, a pipe is fixed firmly without twisting.

When the inclination angle of the first tapered surface and the inclination angle of the second tapered surface are the same, the first tapered surface and the second tapered surface become contact surfaces, and the center axis line of the outer cylinder portion and the center axis line of the sleeve are always coincident with each other. . Therefore, when the screw enters the main body of the outer cylinder part at the time of piping connection, the narrowing pressure to the pipe by the sleeve and the inner cylinder part becomes equal in the entire circumferential direction, so that the sleeve rotates smoothly with respect to the outer cylinder part. As a result, the pipe is firmly fixed without being twisted.

(6) The difference between the inclination angle of the first tapered surface and the inclination angle of the second tapered surface may be set to 15 ° ± 4 °.

With this configuration, since the contact position between the second tapered surface of the sleeve and the first tapered surface of the caulked cylindrical portion is near the base end of the cylindrical portion, the cylinder is operated at the time of the operation of the screw between the main body portion and the outer cylindrical portion connecting the pipe. Difficult to expand the diameter of the part. In other words, this configuration results in a large detachment strength of the sleeve.

EMBODIMENT OF THE INVENTION Below, the Example as an optimal form for implementing the pipe joint of this invention is demonstrated in detail.

(Example 1)

As shown in Fig. 1 to Fig. 3, the pipe joint of the first embodiment connects a pipe 1 (tube) made of fluorine resin to flow a fluid such as air, water, medicines, and the like. The inner cylinder part 4 which has the main body part 2 and the outer cylinder part 3 (nut), and which the piping 1 is inserted in the outer part is extended. The thread part 5 is formed in the outer periphery of the said main-body part 2, and the inner periphery of the outer cylinder part 3, respectively. In addition, the inner cylinder portion 4 is provided with an expansion portion 6 covering the pipe 1, and the expansion portion 6 is provided with an inclined surface 7 whose diameter decreases as it goes to the tip.

In the inner circumferential region of the outer cylinder portion 3, a sleeve 8 having a predetermined width is accommodated in an anti-separation state, and the pipe 1 is an inner cylinder portion of the sleeve 8 and the main body 2 in an anti-separation state ( 4) It is fixed by being pushed in between. The sleeve 8 allows a relative rotation with respect to the outer cylinder part 3 by making it the outer peripheral dimension of a little small diameter with respect to the accommodation area of the outer cylinder part 3.

The outer circumferential diameter of the sleeve 8 is set to a diameter smaller than the inner circumferential diameter of the threaded portion 5 of the outer cylinder portion 3, and is inserted at the threaded portion 5 side of the outer cylinder portion 3. Then, by inserting the snap ring 9 capable of elastic deformation set to a diameter slightly larger than the inner circumferential diameter of the screw portion 5 of the outer cylinder portion 3 from the screw portion 5 side, the sleeve is formed in the inner circumference of the outer cylinder portion 3. (8) is housed in the fall prevention state.

Next, the use state of the pipe joint of this embodiment is explained.

The procedure for connecting the pipe 1 to the pipe joint is as follows. First, the pipe 1 is inserted into the separated outer cylinder part 3 (the sleeve 8 is accommodated), and then the end of the pipe 1 is covered with the inner cylinder part 4 of the main body part 2. Then, the outer cylinder portion 3 and the screw portion 5 of the main body portion 2 are screwed together to tighten. Then, between the inner cylinder part 4 and the sleeve 8 which have the inclined surface 7 which becomes small in diameter when it goes to the front end, the piping 1 is pressed in gradually. Since the sleeve 8 can be rotated relative to the outer cylinder portion 3, the outer cylinder portion 3 is rotated on the body portion 2 while the pipe 1 is fixed to the inner cylinder portion 4 of the main body portion 2. Can be screwed together.

On the other hand, the procedure of peeling off the piping 1 connected from a pipe joint is as follows. When the outer cylinder portion 3 (nut) is rotated in the main body portion 2 in a loosening direction to release the mutual screwing state, the outer cylinder portion 3 (nut) is gradually displaced in the direction away from the main body portion 2. At the same time, the sleeve 8 in the state accommodated in the outer cylinder part 3 also gradually shifts from the piping 1. And when the outer cylinder part 3 (nut) is peeled off from the main-body part 2, the sleeve 8 will also be in the state which peeled off from the piping 1. As shown in FIG. By the way, in the structure of FIGS. 11-13 described in the column of the background art, when the connected pipe 23 is peeled off from the pipe joint, since the sleeve 26 is normally firmly fixed to the pipe 23, A large force is required to displace the sleeve 26 from the pipe 23 by hand, and if the force is inadvertently applied, the sleeve 26 is deformed and cannot be reused. In this embodiment, the inner circumference of the outer cylinder 3 Is a structure in which the sleeve 8 is housed in a preventive state, and the sleeve 8 is also peeled off when the outer cylinder 3 (nut) is loosened, so that the sleeve is damaged as in the case of a structure that must be handled by hand. Can be prevented appropriately.

Since the pipe joint is accommodated in the inner circumferential region of the outer cylinder portion 3 which is screwed with the main body portion 2 in a state where the sleeve 8 is prevented from falling out, the main body portion 2 and Even when the outer cylinder part 3 is removed, the sleeve 8 does not fall off, and there exists an advantage that the handling of the sleeve 8 is excellent compared with the past.

Further, the sleeve 8 is inserted into the inner circumferential region of the outer cylindrical portion 3 by inserting the snap ring 9 capable of elastic deformation set to a diameter slightly larger than the inner circumferential diameter of the screw portion 5 of the outer cylindrical portion 3 on the screw portion 5 side. Since the) is accommodated in the fall prevention state, there is an advantage that it is possible to prevent the fall of the sleeve (8) with a simple structure.

(Example 2)

Next, Example 2 will be described focusing on differences from Example 1. FIG.

As shown in Figs. 4 to 6, an inner cylinder portion 4 having a main body portion 2 and an outer cylinder portion 3 (nut) which are mutually screwed together, and into which the pipe 1 is inserted, is provided in the main body portion 2; It is extended. The thread part 5 is formed in the outer periphery of the said main-body part 2, and the inner periphery of the outer cylinder part 3, respectively. In addition, the inner cylinder portion 4 is provided with an expansion portion 6 covering the pipe 1, and the expansion portion 6 is provided with an inclined surface 7 whose diameter decreases as it goes to the tip.

In the inner circumferential region of the outer cylinder portion 3, the sleeve 8 is accommodated in an anti-separation state, and the pipe 1 is disposed between the sleeve 8 in the anti-separation state and the inner cylinder portion 4 of the main body 2. It is pressed and fixed. The sleeve 8 makes the relative rotation with respect to the outer cylinder part 3 as the outer peripheral dimension of a slightly small diameter with respect to the accommodation area of the outer cylinder part 3.

The outer circumferential diameter of the sleeve 8 is set to a diameter larger than the inner circumferential diameter of the threaded portion 5 of the outer cylinder portion 3. Then, the sleeve 8 is inserted into the pipe insertion hole 10 side of the outer cylinder portion 3, and the sleeve 8 is prevented from falling out of the inner circumferential region of the outer cylinder portion 3 by caulking the pipe insertion hole 10. It is supposed to be accepted.

Next, the use state of the pipe joint of this embodiment is explained.

The procedure for connecting the pipe 1 to the pipe joint is as follows. First, the pipe 1 is inserted into the separated outer cylinder part 3 (the sleeve 8 is accommodated), and then the end of the pipe 1 is covered with the inner cylinder part 4 of the main body part 2. And the outer cylinder part 3 and the screw part 5 of the main body part 2 are screwed together, and it tightens. Then, the pipe 1 is gradually pressed in between the inner cylinder portion 4 and the sleeve 8 having the inclined surface 7 whose diameter decreases toward the tip. Since the sleeve 8 can be rotated relative to the outer cylinder portion 3, the outer cylinder portion 3 is rotated on the body portion 2 while the pipe 1 is fixed to the inner cylinder portion 4 of the main body portion 2. You can screw them together.

On the other hand, the procedure of peeling off the piping 1 connected from a pipe joint is as follows. When the outer cylinder portion 3 (nut) is rotated in the main body portion 2 in a loosening direction to release the mutually screwed state, the outer cylinder portion 3 (nut) gradually displaces in the direction of disengagement from the main body portion 2. At the same time, the sleeve 8 in the state accommodated in the outer cylinder part 3 also gradually shifts from the piping 1. And if the outer cylinder part 3 (nut) is peeled off from the main-body part 2, the sleeve 8 will also be peeled off from the piping 1. By the way, in the structure of FIGS. 11-13 described in the column of the background art, when the connected pipe 1 is peeled off from the pipe joint, the sleeve 8 is usually firmly fixed to the pipe 1, In order to displace the sleeve 8 from the pipe 1, a large force is required. If the force is inadvertently applied, the sleeve 8 is deformed and cannot be reused. The sleeve 8 is a structure in which the sleeve 8 is housed in an anti-separation state, and when the outer cylinder portion 3 (nut) is loosened, the sleeve 8 is also peeled off, so that the sleeve 8 is similar to the case of the structure that must be handled by hand. ) Can be properly prevented.

Since the pipe joint is accommodated in the inner circumferential region of the outer cylinder portion 3 which is screwed with the main body portion 2 in a state where the sleeve 8 is prevented from falling out, the main body portion 2 and Even when the outer cylinder part 3 is removed, there is an advantage that the sleeve 8 is better handled than before without the sleeve 8 falling off.

In addition, the sleeve 8 is inserted into the pipe insertion port 10 side of the outer cylinder portion 3 and the sleeve 8 is received in the inner circumferential region of the outer cylinder portion 3 so as to be prevented from falling out by caulking the pipe insertion hole 10. Therefore, there is an advantage that the sleeve 8 can be reliably prevented from falling out.

(Example 3)

Next, Example 3 will be described focusing on differences from Example 2. FIG.

As shown in Figs. 7 to 9, an inner cylinder portion 4 having a main body portion 2 and an outer cylinder portion 3 (nut) that are mutually screwed together, and into which the pipe 1 is inserted, is provided in the main body portion 2; It is extended. The thread part 5 is formed in the inner periphery of the said main-body part 2, and the outer periphery of the outer cylinder part 3, respectively. In addition, the inner cylinder portion 4 is provided with an expansion portion 6 covering the pipe 1, and the expansion portion 6 is provided with an inclined surface 7 whose diameter decreases as it goes to the tip.

In the inner circumferential region of the outer cylinder portion 3, the sleeve 8 is accommodated in an anti-separation state, and the pipe 1 is disposed between the sleeve 8 in the anti-separation state and the inner cylinder portion 4 of the main body 2. It is pressed and fixed. The sleeve 8 allows a relative rotation with respect to the outer cylinder part 3 by making it the outer peripheral dimension of a little small diameter with respect to the accommodation area of the outer cylinder part 3.

The outer circumferential diameter of the sleeve is set to a diameter larger than the inner circumferential diameter of the threaded portion 5 of the outer cylinder portion 3. In addition, an annular member 11 (nut ring) for preventing the sleeve from being pulled out together with the sleeve 8 is inserted at the pipe insertion port 10 side of the outer cylinder portion 3, and the pipe insertion port 10 side is caulked. .

Next, the use state of the pipe joint of this embodiment is explained.

The procedure for connecting the pipe 1 to the pipe joint is as follows. First, the pipe 1 is inserted into the separated outer cylinder part 3 (the sleeve 8 is accommodated), and then the end of the pipe 1 is covered with the inner cylinder part 4 of the main body part 2. And the outer cylinder part 3 and the screw part 5 of the main body part 2 are screwed together, and it tightens. Then, between the inner cylinder part 4 and the sleeve 8 which have the inclined surface 7 which becomes small in diameter when it goes to the front end, the piping 1 is pressed in gradually. Since the sleeve 8 allows relative rotation with respect to the outer cylinder portion 3, the outer cylinder portion 3 is fixed to the main body portion 2 while the pipe 1 is fixed to the inner cylinder portion 4 of the main body portion 2. Can be screwed while rotating.

On the other hand, the procedure of peeling off the piping 1 connected from a pipe joint is as follows. When the outer cylinder portion 3 (nut) is rotated in the main body portion 2 in a loosening direction to release the mutually screwed state, the outer cylinder portion 3 (nut) gradually displaces in the direction of disengagement from the main body portion 2. At the same time, the sleeve 8 in the state accommodated in the outer cylinder part 3 also gradually shifts from the piping 1. And if the outer cylinder part 3 (nut) is peeled off from the main-body part 2, the sleeve 8 will also be peeled off from the piping 1. By the way, in the structure of FIGS. 11-13 described in the column of the background art, when the connected pipe 1 is peeled off from the pipe joint, the sleeve 8 is usually firmly fixed to the pipe 1, In order to displace the sleeve 8 from the pipe 1, a large force is required. If the force is inadvertently applied, the sleeve 8 is deformed and cannot be reused. The sleeve 8 is a structure in which the sleeve 8 is housed in an anti-separation state, and when the outer cylinder portion 3 (nut) is loosened, the sleeve 8 is also peeled off, so that the sleeve 8 is similar to the case of the structure that must be handled by hand. ) Can be properly prevented.

Since the pipe joint is accommodated in the inner circumferential region of the outer cylinder portion 3 which is screwed with the main body portion 2 in a state where the sleeve 8 is prevented from falling out, the main body portion 2 and Even when the outer cylinder part 3 is removed, there is an advantage that the sleeve 8 is better handled than before without the sleeve 8 falling off.

In addition, the sleeve insertion preventing annular member 11 (nut ring) is inserted together with the sleeve 8 at the pipe insertion opening 10 side of the outer cylinder portion 3, and the pipe insertion opening 10 side is cocked. Since the shape and the dimension of the contact portion of the sleeve and the annular member for preventing the sleeve from falling off can be manufactured with high accuracy, there is an advantage that stable performance can be obtained.

(Example 4)

Next, Example 4 will be described focusing on differences from Example 2. FIG.

As shown in FIG. 10, the main body part 2 and the outer cylinder part 3 (nut) which are mutually screwed together are provided, and the said inner body part 4 which extends the piping 1 outside is provided in the said main body part 2, and is extended. have. The thread part 5 is formed in the inner periphery of the said main-body part 2, and the outer periphery of the outer cylinder part 3, respectively. In addition, the inner cylinder portion 4 is provided with an expansion portion 6 covering the pipe 1, and the expansion portion 6 is provided with an inclined surface 7 whose diameter decreases as it goes to the tip.

In the inner circumferential region of the outer cylinder portion 3, the sleeve 8 is accommodated in an anti-separation state, and the pipe 1 is disposed between the sleeve 8 in the anti-separation state and the inner cylinder portion 4 of the main body 2. It is pressed and fixed. The sleeve 8 allows a relative rotation with respect to the outer cylinder portion 3 as an outer circumferential dimension of a slightly smaller diameter with respect to the receiving region of the outer cylinder portion 3.

Here, the pipe joint of this embodiment is set to a diameter larger than the inner circumferential diameter of the threaded portion 5 of the outer cylinder portion 3 and the outer circumferential diameter of the sleeve 8 at the pipe insertion opening 10 side of the outer cylinder portion 3. The sleeve 8 is inserted, and the sleeve 8 is accommodated in the inner circumferential region of the outer cylinder portion 3 in a state of preventing falling out by caulking the cylindrical portion 10a constituting the pipe insertion opening 10. The mode of caulking the cylindrical portion 10a is such that the inner circumferential surface of the cylindrical portion 10a becomes the first tapered surface T1 whose diameter decreases from the proximal end side to the distal end side, and on the other hand, the sleeve 8 It is assumed that the outer peripheral surface has a second tapered surface T2 whose diameter decreases toward the pipe insertion port side, and the inclination angle of the first tapered surface T1 with respect to the central axis J1 of the outer cylinder portion 3 is determined by the sleeve 8. Is set smaller than the inclination angle of the second tapered surface T2 with respect to the center axis line J2. In this embodiment, the inclination angle of the first tapered surface T1 with respect to the central axis J1 is set to 30 degrees, and the inclination angle of the second tapered surface T2 with respect to the central axis J2 is set to 45 degrees. (The difference between the inclination angle of the first tapered surface T1 and the inclination angle of the second tapered surface T2 can be set to 15 ° ± 4 °).

Since the use condition of the pipe joint of this embodiment is the same as that of Example 2 mentioned above, description is abbreviate | omitted, but only the characteristic function of this embodiment is demonstrated below.

Since this pipe joint is the structure as mentioned above, the inner cylinder part of the sleeve 8 and the main body part 2 which the pipe 1 was accommodated in the inner peripheral part of the outer cylinder part 3 in FIG. At the time of operation | movement which the screw of the main body part 2 and the outer cylinder part 3 mutually interlocked between (4) entered, the 1st taper surface T1 and the sleeve 8 which were formed by caulking the cylindrical part 10a The contact trace of the formed second tapered surface T2 is a contact line (the central axis J1 of the outer cylinder portion 3) generated by the position of the largest diameter portion of the first tapered surface T1 and the second tapered surface T2. On the orthogonal plane, it becomes also the circular locus of the same radius r from the center axis J1 of the outer cylinder part 3).

Therefore, the sleeve rotates smoothly with respect to the outer cylinder part 3 at the time of the operation which the screw of the main body part 2 and the outer cylinder part 3 mutually entered at the time of piping connection, As a result, the piping 1 (not shown) Is firmly fixed without twisting.

Moreover, this pipe joint sets the inclination angle of the 1st taper surface T1 with respect to the center axis line J1 to 30 degrees, and the inclination angle of the 2nd taper surface T2 with respect to the center axis line J2 to 45 degrees. Since the contact position between the second tapered surface T2 of the sleeve 8 and the first tapered surface T1 of the caulked cylindrical portion 10a is near the base end of the cylindrical portion, the pipe 1 is connected. The cylindrical portion 10a is difficult to expand in diameter when the screw between the main body portion 2 and the outer cylinder portion 3 enters. That is, with this structure, the leaving strength in the outer cylinder part 3 of the sleeve 8 becomes large.

By the way, the inclination angle of the first tapered surface T1 generated by caulking the cylindrical portion 10a becomes non-uniform compared to the inclination angle of the second tapered surface T2 of the sleeve 8 generated by cutting. It is preferable to make the inclination angle of the 1st taper surface T1 as uniform as possible. Therefore, when caulking the cylindrical portion 10a, the staff-shaped concave surface (side surface) formed in the caulking shape is pressed against the tip of the cylindrical portion 10a in the same angle from the entire circumference, and the cylindrical portion ( It is good to caulk 10a) from the state of the dashed-dotted line of FIG. 10 to the state of a solid line.

In the above embodiment, the inclination angle of the first tapered surface T1 with respect to the central axis J1 is set to 30 degrees, and the inclination angle of the second tapered surface T2 with respect to the central axis J2 is set to 45 degrees. Although it is not limited to this, the inclination angle of the 1st taper surface T1 and the inclination angle of the 2nd taper surface T2 can be made the same. In this case, the first tapered surface T1 and the second tapered surface T2 are brought into surface contact, and the center axis line J1 and the center axis line J2 always coincide with each other. Therefore, when the screw enters the main body portion 2 of the outer cylinder portion 3 at the time of piping connection, the narrowing pressure to the pipe 1 by the sleeve 8 and the expansion portion 6 becomes equal in the entire circumferential direction. For this reason, the sleeve 8 rotates smoothly with respect to the outer cylinder part 3, and as a result, the piping 1 (not shown) is firmly fixed without twisting.

In the pipe joint of the present invention, the sleeve does not fall off even when the main body portion and the outer cylinder portion are detached at the time of the pipe connecting operation, and thus the sleeve joint is superior in handling of the sleeve.

Claims (6)

delete delete The inner cylinder portion which has a main body portion and an outer cylinder portion which are mutually screwed together is extended to the main body portion, and the inner cylinder portion which fits the pipe outside is installed, and the inner circumferential portion of the outer cylinder portion is accommodated in an anti-separation state, and the pipe is in an anti-separation state sleeve. In the pipe joint which is pressed and fixed between the inner cylinder part and a main body part, The outer circumferential diameter of the sleeve is set to a diameter larger than the inner circumferential diameter of the screw portion of the outer cylinder portion, and the sleeve is inserted at the pipe insertion port side of the outer cylinder portion, and the sleeve is inserted into the inner circumferential region of the outer cylinder portion by the cocking of the pipe insertion port. Pipe joints characterized in that. The method of claim 3, wherein And an annular member for preventing the sleeve from being pulled out together with the sleeve at the pipe insertion port side of the outer cylinder part to coke the pipe insertion port side. The method of claim 3, wherein The sleeve is rotatably inserted into an inner circumferential region of the outer cylinder portion, and the sleeve is received in an inner circumferential region of the outer cylinder portion to prevent the sleeve from being pulled out by caulking the cylindrical portion constituting the pipe insertion port. The inner circumferential surface of the portion is made to be the first tapered surface whose diameter decreases from the proximal end side to the distal end side, while the outer circumferential surface of the sleeve has a second tapered surface whose diameter decreases toward the pipe insertion port side. The inclination angle of the first tapered surface with respect to the axis is set to be smaller than or equal to the inclination angle of the second tapered surface with respect to the central axis of the sleeve. The method of claim 5, The difference between the inclination angle of the first tapered surface and the inclination angle of the second tapered surface is 15 ° ± 4 °.

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