JP2000179759A - Fitting structure for pipe body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely fix a fitting body to a pipe body by simple constitution. SOLUTION: In this fitting structure, an annular protrusion is provided in an outer circumferential face of one pipe body 1, and a fitting body 6 is mounted on an outer circumferential side of the pipe body 1 to connect the other pipe body 2 to the pipe body 1. A fixing part 7 press-deformed to sandwich the annular protrusion to a pipe-axial direction is provided in the fitting body 6, and the fitting body 6 is intergrally fixed to the annular protrusion by the press-deformation of the fixing part 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a pipe joint structure.

[0002]

2. Description of the Related Art As a joint structure for a pipe of this kind, there is one disclosed in Japanese Patent Laid-Open No. Hei 10-2471.

As shown in FIG. 12, the joint structure of the pipes described in this publication is such that each pipe 5 is connected to connect a pair of pipes 51 and 52.
An annular joint body 53, 54 detachably fitted to the end of each of the joint bodies 1, 52, and a bolt for connecting the two pipe bodies 51, 52 by joining the joint bodies 53, 54 to each other. And the like.

[0004] The outer peripheral grooves 56,
To the 56, annular ring bodies 57, 57 are mounted so that a part thereof protrudes from the outer peripheral surface. The ring body 5
A joint nut 5 mounted on the front side of the ring body 57 (end side of the pipe bodies 51 and 52) is provided with a lock nut 58 which is provided on the rear side of the rear body 7 and has a male thread on the outer peripheral surface on the front side.
3 and 54 into the female screw section from the rear side.
8, 58 and the joint bodies 53, 54 form ring bodies 57, 57.
Are sandwiched in the pipe axis direction, whereby the joint bodies 53, 54 are mounted on the respective pipe bodies 51, 52 via the ring bodies 57, 57.

[0005]

However, in the joint structure having the above structure, the joint bodies 53 and 54 are connected to the pipes 51 and 54, respectively.
A separate lock nut 58 is required for mounting on the fitting 52, which complicates the configuration.
52, the lock nut 58 and the joint body 53,
A screwing operation with 54 is also required.

Accordingly, the present invention has been developed to further improve the prior art as described above. An object of the present invention is to provide a joint structure for a pipe body which can securely fix the joint body to the pipe body with a simple structure. Is to provide.

[0007]

The technical means taken by the present invention to solve the above-mentioned problem is that an annular convex portion 5c is provided on the outer peripheral surface of one tube 1 and the other tube 2 A joint structure of a tubular body in which a joint body 6 is mounted on the outer peripheral side of one tubular body 1 so as to be connected to one tubular body 1. There is provided a fixing portion 7 which is pressed and deformed so as to be sandwiched in the axial direction, and the joint main body 6 is integrally fixed to the annular convex portion 5c by the pressing deformation of the fixing portion 7.

In the joint structure of the tubular body, the fixing portion 7 is deformed by pressing to form the fixing portion 7 into the annular convex portion 5c.
Is held in the pipe axis direction, and the fixing body 7 sandwiches the annular projection 5c, whereby the joint body 6 is integrally fixed to the annular projection 5c. Therefore, the joint main body 6 can be reliably fixed to the one tubular body 1 via the annular convex portion 5c only by pressing and deforming the fixing portion 7.

In particular, as described in claim 2, one of the tubes 1
In the case where the ring body 5 is attached to the outer peripheral groove 3 of the outer peripheral surface so that a part thereof protrudes from the outer peripheral surface, and the annular convex portion 5 c is formed by the ring body 5, according to the outer peripheral groove 3. By pressing and deforming the formed inner peripheral convex portion 4 from the inner peripheral side toward the outer peripheral side, that is, toward the ring member 5, the deformed portion 9 formed by the pressing deformation and the fixed portion 7 form a ring member. 5 can be clamped radially from inside and outside. Therefore, the mounting state of the ring body 5 and the one tube body 1 is strengthened by the deforming portion 9, and in particular, the rotation of the ring body 5 in the circumferential direction with respect to the one tube body 1 can be reliably prevented.
Since the rotation of the ring body 5 is prevented, the rotation of the joint body 6 integrally fixed to the ring body 5 can also be reliably prevented, so that the other pipe body 2 can be connected in a stable state.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 6 in which a stainless steel thin pipe fitting 1 is connected to a stainless thin pipe 2. The structure will be described. This will be described with reference to the drawings.

The pipe joint 1 and the pipe 2 have a substantially uniform thickness and can be radially expanded or reduced in diameter. Is formed over the entire circumference in the circumferential direction. With the formation of the diameter-reduced concave groove 3, an inner peripheral convex portion 4 is formed over the entire circumference at a position on the inner peripheral surface corresponding to the diameter-reduced concave groove 3. Be formed. Each of the reduced-diameter concave grooves 3 is provided with an annular ring body 5 which can be freely expanded and contracted.

As shown in FIG. 6, a plurality of ring members 5 are provided.
For example, it is composed of an arcuate core wire 5a divided into three parts and a coil spring 5b externally fitted to the core wire 5a. When the ring body 5 is mounted in the reduced-diameter concave groove 3 of the pipe joint 1 and the pipe 2, as shown in FIGS. 2 and 3, substantially half of the ring body projects from the outer peripheral surface, and the ring body protrudes from the outer peripheral surface. 5 protrusion 5c
The pipe 2 is connected to the pipe joint 1 by using an (annular convex part).
Hereinafter, a specific description will be given.

A joint body 6 for connecting the pipe 2 to the pipe joint 1 is mounted on the outer peripheral side of the ring body 5 mounted in the reduced diameter groove 3 of the pipe joint 1. The joint body 6 is formed in a cylindrical shape as a whole, and has a male screw portion 6a formed on an outer peripheral surface at one end (front end), and has an entire periphery at the other end (rear end). An annular flange portion 6b extends toward the inner peripheral side, and a plurality of (for example, four) hook portions 21 for engaging a tightening tool such as a spanner are provided on the outer peripheral surface of the other end portion. Become. And the annular collar 6
As shown in FIG. 3, a fixing portion 7 that straddles the ring body 5 in the tube axis direction is formed at the inner peripheral end of the b. The fixing part 7
Is formed so as to be pressed and deformed in the pipe axis direction by caulking to pinch the ring body 5 across the pipe axis direction, and the joint body 6 is attached to the ring body 5 by the press deformation of the fixing portion 5. It is fixed integrally.

Specifically, the fixing portion 7 is provided with a caulking piece 8 extending toward the front side as shown by a two-dot broken line in FIG. The fixing portion 7 is configured to hold the ring body 5 in the tube axis direction by being pressed and deformed from the rear side.

As described above, the joint body 6 is integrally fixed to the ring body 5 by the fixing portion 7, while the inner peripheral convex portion 4 corresponding to the reduced-diameter concave groove 3 is pressed and deformed toward the outer peripheral side. A deformation portion 9 is provided. The deformed portions 9 are provided at a plurality of positions, for example, at four positions at intervals of 90 degrees. After caulking the caulked pieces 8, a tapered pressing tool is inserted from the opening (front side) of the pipe joint 1. , Formed by pressing and deforming a part of the inner peripheral convex portion 4 toward the outer peripheral side.

On the other hand, on the front side of the ring body 5, an annular seal member 10 made of rubber is inserted into an annular gap between the inner peripheral surface of the joint body 6 and the outer peripheral surface of the pipe joint 1. The seal member 10 is also in contact with the open end face 1a of the pipe joint 1. The sealing member 10 is in a state before insertion as shown in FIG.
As shown in (a), the inner peripheral surface 10a has an annular lip piece 11 having a substantially triangular cross section in order to secure adhesion and sealing with the outer peripheral face of the pipe joint 1, and the lip piece 11 at the time of insertion. A pair of front and rear annular recesses 12 having a substantially triangular cross-section for inserting the leading end are provided.

The pipe 2 connected to the pipe joint 1 is provided with an annular pressing ring 13 on the rear side (opposite to the connected end) of the ring body 5 and in front of the pressing ring 13. The side (the opening side of the pipe 2) is located between the outer peripheral surface of the pipe 2 and the inner peripheral surface of the joint body 6. Further, the pressing ring 1
A rubber seal member 14 is inserted into the annular gap between the outer peripheral surface of the pipe 2 and the inner peripheral surface of the joint body 6 on the front side of the pipe 3 in the same manner as on the pipe joint 1 side. The seal member 14 also comes into contact with the open end face 2a of the pipe 2 in the same manner as the pipe joint 1 side, and the two seal members 10, 14 are connected to the end faces 10b,
14b are in contact with each other. Prior to insertion, as shown in FIG. 5 (b), the lip piece 15 and the depression 16 are formed on the inner peripheral surface 14a and the end surface 14b of the seal member 14 on the tube 2 side before insertion. The lip piece 17 and the recess piece 18 are also formed.

Further, on the rear side of the pressing ring 13,
By pressing the pressure ring 13 toward the pipe joint 1 (front side), a tightening ring 19 for connecting the pipe 2 to the pipe joint 1 is provided. The fastening ring 19 is formed in a tubular shape having a plurality of hooks 21 similar to the joint body 6 formed on the outer peripheral surface, and a female screw portion 19a is formed on a front inner peripheral surface thereof. It is screwed into the male screw portion 6a of the joint body 6. Then, the tightening ring 19 is screwed onto the joint body 6 and tightened, so that the rear end side inner flange portion 19b of the tightening ring 19 presses the pressing ring 13 forward, and the pressing ring 13 is By pressing the pipe 5 to press the pipe 2 toward the pipe joint 1, the pipe 2 is connected to the pipe joint 1.

In a connected state, that is, in a state in which the fastening ring 19 is screwed to the joint body 6, the front end 19c of the fastening ring 19 is connected to the external thread end position 2 of the joint body 6.
0 covers the rear side. FIGS. 1 and 2 show a state in which the hook portions 21 of the joint body 6 and the fastening ring 19 are in the same phase.

Next, the case where the pipe 2 is connected to the pipe joint 1 will be described. First, after fitting the joint body 6 to the pipe joint 1, the ring body 5 is attached to the reduced-diameter concave groove 3.
Since the ring body 5 can be freely expanded and contracted, it can be easily mounted.
After the ring body 5 is mounted, a swaging piece 8 as shown by a two-dot broken line in FIG.
Is pressed and deformed toward the rear side in the tube axis direction (toward the protruding portion 5c of the ring body 5) by caulking. As a result, the swaging piece 8 is pressed and deformed to press the front side of the ring body 5 over the entire circumference. Therefore, the pressing portion 8 deforms the fixing portion 7.
As a result, the ring body 5 is clamped in the pipe axis direction, so that the joint body 6 can be integrally fixed to the ring body 5 easily by a simple operation of caulking without using a separate member.

Next, in a state where the position of the joint body 6 in the pipe axis direction is fixed, a part (four places) of the inner peripheral convex portion 4 is moved to the outer peripheral side by inserting a pressing tool from the opening side of the pipe joint 1. The deformed portion 9 is formed by pressing and deforming the ring member 5, and the ring body 5 is pressed in the radial direction by the pressing force when the deformed portion 9 is formed. Therefore, as a result of the ring body 5 being clamped in the radial direction by the deforming part 9 and the fixing part 7, rotation of the ring body 5 in the circumferential direction is prevented, and rotation of the joint body 6 can be prevented.

After the joint main body 6 is completely fixed to the pipe joint 1 in this way, the seal member 10 is inserted into the annular gap to complete the work on the pipe joint 1 side. By performing such a series of operations at a different place (such as a factory) instead of at the site, only the following pipe 2 connection work is performed at the site.

At the site, first, the tightening ring 19 and the pressing ring 13 are sequentially covered with the connecting pipe 2 and then the pipe joint 1
The ring body 5 is mounted in the reduced-diameter concave groove 3 as in the case of (1). And after inserting the sealing member 14 like the pipe joint 1,
The openings of both (the pipe joint 1 and the pipe 2) face each other, and the front side of the joint body 6 is inserted between the outer peripheral surface of the seal member 14 on the pipe 2 side and the inner peripheral surface of the tightening ring 19. Then, the fastening ring 19 is screwed into the joint body 6.

By screwing the tightening ring 19 to the joint body 6, the tightening ring 19 presses the pressing ring 13 toward the pipe joint 1, and the pressing ring 13 presses the ring body 5 and the seal member 14. . At this time, the joint body 6 tends to rotate relative to the pipe joint 1 due to the rotation of the tightening ring 19, but since the rotation is prevented by the deforming portion 9, the tightening operation can be performed easily. Further, at the time of screwing the tightening ring 19, the tightening ring 19 is rotated with one tool (a wrench or the like), and the joint body 6 is fixed with the other tool to further reliably rotate. Since the connection can be prevented, the connecting operation of the pipe 2 to the pipe joint 1 can obtain more certainty. Therefore, in the unlikely event,
That is, even when the effect of preventing the rotation of the joint body 6 by the deformed portion 9 is reduced, the pipe 2 can be reliably connected.

Further, the pipe 2 is moved by the screwing of the tightening ring 19.
Relatively moves to the pipe joint 1 side, and both seal members 10, 1
After the end faces 10a and 14a of the seal member 4 are in contact with each other, the lip piece 17 of the end face 14b of the seal member 14 on the pipe 2 side is recessed.
Get stuck in. Further, the two seal members 10 and 14 are pressed in the tube axis direction and are deformed in the radial direction by a predetermined amount (the lip pieces 11 and 1).
(Including the deformations of Nos. 5 and 17), it is possible to ensure the sealing property of the connecting portion. Then, as shown in FIG. 2, the screwing is completed and the connecting operation is completed.

In this connected state, the sealing member 1
Since the first and second pipes 0 and 14 come into contact with the open end faces 1a and 2a of the pipe joint 1 and the pipe 2, the sealing performance at the open end faces 1a and 2a can be ensured.
4b is provided with a lip piece 17 and a concave portion 18, and in the connected state, the lip piece 17 is fitted into the concave portion 18, so that a more reliable sealing property can be secured as compared with a flat case. .

Further, the joint body 6 is fixed by the tightening ring 19.
Is covered on the rear side of the male screw terminal end position 20, so that even if a bending force acts on the connecting portion, the tightening ring 1
Due to the reinforcing effect of the joint body 6 by the joint 9, sufficient strength and durability can be obtained, and the outer diameter of the joint body 6 itself can be reduced. As a result, there is an advantage that the entire joint structure can be reduced in diameter. . In addition, since the joint main body 6 is not fixed to the ring body 5 by using a separate member, but is fixed by pressing deformation of the fixing portion 7, the size in the tube axis direction can be reduced.

The joint body 6, the tightening ring 19, the pressing ring 13, and the ring body 5 are used as they are in a relatively thick pipe 2 or pipe joint 1 (steel pipe, resin pipe, etc.) as shown in FIG. Can be used. In this mode, the outer peripheral groove 3 is formed on the outer peripheral surface by cutting or the like because it is difficult to employ the processing method of increasing or decreasing the diameter in the radial direction as described above because the thickness is relatively large. In this case, since the inner peripheral convex portion 4 cannot be provided, if the rotation of the ring body 5 cannot be prevented only by the deformed portion 8, it can be fastened using the hook portion 21 of the joint body 6. Also, as shown in FIG.
May not be provided, and the entire outer peripheral surface of the joint body 6 may be covered by the tightening ring 19. In particular, in the case of a thin wall, the inner peripheral convex portion 4 can be formed. The size can be shortened and the effect is great. FIG. 9 shows a state in which the joint structure of this embodiment is being connected.

Further, in the thin-walled pipe 2 and the pipe joint 1, instead of the ring body 5, an annular convex portion is formed on the outer peripheral surface in the circumferential direction as an annular convex portion, and a joint is provided on the radially enlarged convex portion. The main body 6 can be fixed.

Of course, the present invention can also be applied to connection of a lining steel pipe having an inner peripheral surface lined or a connection in which both the inner peripheral surface and the outer peripheral surface are lined as shown in FIG. Further, when the outer peripheral groove 3 is formed on the outer peripheral surface by cutting or the like, a part of the lining layer 30 on the outer peripheral surface is cut off, so that a gap between the rear inner peripheral surface of the joint main body 6 and the outer peripheral surface of the pipe joint 1 is reduced. It is preferable to interpose O-rings 22 between the tip of the tightening ring 19 and the joint body 6, respectively.
On the rear side of the tightening ring 19, there is provided an O
Screw the ring press ring 23, and insert O
Preferably, a ring 22 is interposed. Even when this joint structure is buried in the ground, the invasion of moisture from the outside can be blocked by the O-rings 22 by the O-rings 22, and the corrosion of the portion where the lining layer 30 has been cut off can be reliably prevented. There are advantages. Further, in order to connect the lining-treated products in this way, generally, the open end surfaces 2a, 1a of the pipe 2 and the pipe joint 1 are fitted with a corrosion-resistant core made of a synthetic resin and having a substantially L-shaped cross section when mounted. Many, but Figure 1
As shown in FIG. 0 and FIG. 11, by extending both seal members 10 and 14 to the inner peripheral surface side, there is an advantage that the anticorrosion core becomes unnecessary.

In the above embodiment, the connection between the pipe joint 1 and the pipe 2 has been described. However, the shape of the pipe joint 1 is not limited, and may be a T type or the like in addition to the elbow type. .
It can also be used for connecting straight pipes. Others
The deformation part 8 is partially provided, and the shape and position are also, for example,
There is no limitation such as caulking from the other side. Pressing deformation means other than caulking may be used.

[0032]

As described above, in the joint structure of a tubular body according to the present invention, the joint body can be easily and securely fixed to the tubular body via the ring body by a simple operation of pressing deformation. , Low cost.

Further, as described in the second aspect, by pressing and deforming the inner peripheral convex portion, the rotation of the ring body in the circumferential direction with respect to the tube can be reliably prevented, so that it is necessary to separately provide a fixing member for preventing rotation. Also, when the other main body is connected to the one main body by the joint main body, the joint main body can be easily connected without careless rotation.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a joint structure of a tubular body according to an embodiment of the present invention.

FIG. 2 is a sectional view of the main part.

FIG. 3 is a sectional view of the main part.

FIG. 4 is a sectional view taken along the line PP of FIG. 3;

FIG. 5 shows a main part of a seal member used in the structure, (a) is a cross-sectional view of a main part showing a seal member on a pipe joint side,
(B) is a sectional view of a main part showing a pipe-side sealing member.

FIG. 6 shows a ring body used in the same structure,
(A) is a front view showing the whole, and (B) is a fragmentary sectional view of a main part.

FIG. 7 is a cross-sectional view of a main part of a joint structure for a pipe body according to another embodiment.

FIG. 8 is a cross-sectional view of a main part of a joint structure for a pipe body according to another embodiment.

FIG. 9 is a cross-sectional view showing a state during connection of tubes in the same structure.

FIG. 10 is a cross-sectional view of a main part of a joint structure for a pipe body according to another embodiment.

11A and 11B show a main part of a seal member used in the same structure, wherein FIG. 11A is a main part cross-sectional view showing a pipe joint side seal member, and FIG. 11B is a main part cross section showing a pipe side seal member. FIG.

FIG. 12 is a cross-sectional view showing a conventional pipe joint structure.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Pipe joint (tub body), 2 ... pipe (tub body), 3 ... Reducing groove (outer circumference groove), 4 ... Inner circumference convex part, 5 ... Ring body, 5c ... Projection part (annular convex part), 6 ... Joint body, 7… Fixed part

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[Procedure amendment]

[Submission date] September 27, 1999 (September 9, 1999
7)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction contents]

[0007]

The technical means taken by the present invention to solve the above-mentioned problem is that an annular convex portion 5c is provided on the outer peripheral surface of one tube 1 and the other tube 2 A joint structure of a tubular body in which a joint body 6 is mounted on the outer peripheral side of one tubular body 1 so as to be connected to one tubular body 1. fixing part 7 that is pressed and deformed in the tube axis direction is provided so as to sandwich the axial direction, Ri joint body 6 by press-deformation of the fixing part 7 is Na is integrally fixed to the annular protrusion 5c, moreover, the Outside to one tube 1
A circumferential groove 3 is formed, and a ring body 5 is mounted in the outer circumferential groove 3.
A part of the ring body 5 is the outer peripheral surface of one of the tubular bodies 1
The annular convex portion 5c is formed by projecting from
In addition, the inner peripheral surface of one of the tubular bodies 1 is formed according to the outer peripheral groove 3.
Inner peripheral convex portion 4 is formed.
Circumferential side in Rukoto such is deformed portion 9 which is pressed and deformed is formed toward the.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

[0008] In the joint structure of the tubular body, the fixing portion 7
By pressing and deforming in the tube axis direction , the fixing portion 7 clamps the annular convex portion 5c in the tube axis direction , and the fixing portion 7 clamps the annular convex portion 5c.
Are integrally fixed to the annular projection 5c. Therefore, the joint body 6 can be reliably fixed to one of the tubes 1 via the annular convex portion 5c only by pressing and deforming the fixing portion 7 in the tube axis direction .

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction contents]

In particular, the outer circumferential groove 3 of the outer peripheral surface of the pipe body 1 of the hand
In the case where the ring body 5 is mounted so that a part thereof protrudes from the outer peripheral surface, and the annular convex part 5c is formed by the ring body 5, the inner peripheral convex part 4 formed according to the outer peripheral groove 3 is removed. By pressing and deforming from the inner peripheral side toward the outer peripheral side, that is, toward the ring body 5, the deformed portion 9 formed by the press deformation and the fixed portion 7
The ring body 5 can be held in the radial direction from inside and outside. Therefore, the mounting state of the ring body 5 and the one tube body 1 is strengthened by the deforming portion 9, and in particular, the rotation of the ring body 5 in the circumferential direction with respect to the one tube body 1 can be reliably prevented. Since the rotation of the ring body 5 is prevented, the rotation of the joint body 6 integrally fixed to the ring body 5 can also be reliably prevented, so that the other pipe body 2 can be connected in a stable state.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0032

[Correction method] Change

[Correction contents]

[0032]

As described above, in the joint structure for a tubular body according to the present invention, the joint body is easily connected to the tubular body via the ring body by a simple operation of pressing and deforming the fixing portion in the axial direction of the tube. It can be fixedly mounted securely, and the cost is low.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0033

[Correction method] Change

[Correction contents]

Further, by pressing and deforming the inner peripheral convex portion, the rotation of the ring body in the circumferential direction with respect to the tube can be reliably prevented, so that it is not necessary to separately provide a fixing member for preventing the rotation, and the joint body is used. Also when connecting the other pipe to one pipe, the connection can be easily performed without inadvertent rotation of the joint body.

Claims (2)

[Claims] An annular projection (5c) is provided on the outer peripheral surface of one of the tubes (1), and a joint body (5) is provided to connect the other tube (2) to the one tube (1). 6) is a joint structure of a tubular body mounted on the outer peripheral side of one tubular body (1), and the annular convex portion (5c) is held in the joint body (6) in the axial direction of the tubular body. A fixed portion (7) that is pressed and deformed as described above is provided, and the joint body (6) is integrally fixed to the annular convex portion (5c) by the pressed deformation of the fixed portion (7). Body joint structure. 2. An outer peripheral groove (3) is formed in said one tubular body (1), and a ring body (5) is mounted in said outer peripheral groove (3), and a part of said ring body (5). Project from the outer peripheral surface of the one tubular body (1) to form the annular convex portion (5c), and the inner peripheral surface of the one tubular body (1) has the outer peripheral groove (3). The inner peripheral convex part (4) is formed according to the above), and the deformed part (9) pressed and deformed toward the outer peripheral side is formed in the inner peripheral convex part (4). Joint structure.