JP2000283357A - Pipe joint structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate connection work of both fluid transport pipes while enlarging an applied range and to attain miniaturization in the pipe axis direction of pipe joint structure and reduction in manufacturing cost. SOLUTION: In this joint structure, a collar 3 fitted across both pipe ends 2 opposed to each other on the same axis center X is composed of a plurality of divided collar bodies 3A. A fastening means is provided to connect the divided collar bodies 3A to each other in the clamped state onto the contracted diameter side, and a pair of tapered faces 5 for moving both pipe ends 2 relatively closer into a butting state as the divided collar bodies 3A are displaced onto the diameter contracted side in association with the clamping operation of the fastening means are formed on the inner peripheral surface of the respective divided collar bodies 3A. A sealing means 6 is further provided to seal between both pipe ends 2 by the pressing force to both pipe ends 2 in association with the clamping operation of the fastening means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint structure for connecting flared pipe ends of both fluid transport pipes in a sealed state.

[0002]

2. Description of the Related Art In a conventional pipe joint structure, as shown in FIG.
A coupling body 20 having a tapered receiving surface 20a having the same inclination as that of the coupling body 20; and a jacket that is movably jacketed relative to each of the fluid transport pipes 1 and both sides of the outer peripheral surface of the coupling body 20 in the pipe axis direction. And a cap nut 21 operable to be screwed into a male screw portion 20b formed between the inner surface 2a of both the receiving surfaces 20a of the joint body 20 and the ends 2 of the flared pipes. Each of them has an annular elastic sealing material 22 interposed therebetween, and further, the inner peripheral surface of each of the cap nuts 21 has a tapered pressing surface formed at the same gradient as the outer peripheral surface 2 b of the flared tube end 2. 21a was formed. The receiving surface 20a of the joint body 20 and the inner peripheral surface 2a of the flared tube end 2 are moved along with the screwing operation of the two cap nuts 13 to the tightening side.
By compressing the elastic sealing material 22 interposed between the fluid transport pipe 1 and the flared pipe end 2
Are connected in a sealed state via the joint body 20.

[0003]

In the conventional pipe joint structure, it is necessary to cover each fluid transport pipe 1 with a cap nut 21 before flaring the ends of both fluid transport pipes 1.
Not only is the connection work process of the two fluid transport pipes 1 restricted, but it cannot be used for the fluid transport pipes 1 whose ends are flared in advance, so that the range of application is easily limited naturally, and Since the connection is established between the flared pipe ends 2 of the two fluid transport pipes 1 with the joint body 20 having the male screw portion 20a interposed between the two cap nuts 21, the pipe joint structure is arranged in the pipe axis direction. As the size increases, the production cost tends to increase.

SUMMARY OF THE INVENTION The present invention has been made in view of the above situation, and its main problems are to facilitate the work of connecting the two fluid transport pipes and to expand the applicable range. Another object of the present invention is to provide a pipe joint structure capable of achieving a reduction in the size of the pipe joint structure in the pipe axis direction and a reduction in manufacturing cost.

[0005]

The characteristic feature of the pipe joint structure according to the first aspect of the present invention is that, in the above-described configuration, a connecting ring fitted externally over both opposed pipe ends in a coaxial state is provided. ,
Constructed from a plurality of divided spliced bodies divided in the circumferential direction, and provided with fastening means for connecting the divided spliced bodies in a state of being tightened to the reduced diameter side, the inner peripheral surface of each of the divided spliced bodies is Along with the displacement of the split connecting ring body toward the diameter reducing side due to the tightening operation of the fastening means, a pair of tapered surfaces for moving the two pipe ends relatively close to each other in abutting state are further formed,
The present invention is characterized in that sealing means for sealing between the two pipe ends is provided by a pressing force applied to both pipe ends due to the tightening operation of the fastening means. According to the above-mentioned characteristic configuration, when the flared pipe ends of both fluid transport pipes are connected and connected in a sealed state, the flared pipe ends are arranged across the flared pipe ends that are opposed to each other in a coaxial core state. After the split connecting ring is fitted to the outside, the fastening means for connecting the split connecting rings is tightened, so that each split connecting ring is displaced toward the diameter reducing side due to the tightening operation. The two pipe ends are moved relatively close to each other by a pair of tapered surfaces formed on the inner peripheral surface of the ring body, and both pipe ends are fixed in abutting state, and the pressing force accompanying the tightening operation of the fastening means is performed. Sealing means is pressed against both tube ends, and the space between the two tube ends is sealed by the sealing means. Therefore, since the fluid transport pipe can be used even when the end thereof is flared in advance, the restriction on the connection work is reduced as compared with the conventional pipe joint structure. The connection work can be facilitated and the applicable range can be expanded. In addition, since the flared pipe ends are fastened and fixed by the split connecting ring body and the fastening means of the connecting ring in a state where the two pipe ends are abutted with each other, the pipe joint structure has a pipe core direction that is smaller than that of the conventional pipe joint structure. And at the same time, the manufacturing cost can be reduced.

A characteristic feature of the pipe joint structure according to the second aspect of the present invention is that the pipe joint structure has a tapered receiving surface which comes into contact with the inner peripheral surfaces of both pipe ends fixed in abutting state by the tightening operation of the fastening means. In that an annular spacer is provided. According to the above configuration, both pipes are formed by a pair of tapered surfaces formed on the inner peripheral surface of each of the divided connecting rings as the divided connecting rings are displaced toward the diameter reducing side due to the tightening operation of the fastening means. When the ends are moved relatively close to each other, the inner peripheral surfaces of the two flared tube ends and the tapered receiving surface of the spacer come into contact with each other from the tube axis direction, and the two tube ends are brought into a coaxial core. It is possible to reduce the volume of the annular concave portion formed on the inner peripheral surface side of the ends of both pipes fixed in abutting state. Therefore, not only the butted portion of both pipe ends can be reinforced with a spacer, but also the centering accuracy of both pipe ends can be increased by using the tapered receiving surface of this spacer. In addition, it is possible to suppress the occurrence of turbulent flow caused by the annular concave portions formed on the inner peripheral surface side of both pipe ends.

[0007] The characteristic structure of the pipe joint structure according to claim 3 of the present invention is that the inner peripheral surface of the spacer is continuous or substantially continuous with the inner peripheral surface of the fluid transport pipe at the same or almost the same inner diameter. The point is that it is configured to. According to the above-mentioned characteristic configuration, when the two pipe ends are fixed in an abutting state by the tightening operation of the fastening means, the inner peripheral surfaces of the two fluid transport tubes and the spacer are the same or substantially the same. Since the inner diameter is continuous or almost continuous, the occurrence of turbulent flow due to the annular concave portion formed on the inner peripheral surface side of both pipe ends can be favorably suppressed.

According to a fourth aspect of the present invention, there is provided a pipe joint structure according to the first aspect of the present invention, wherein the sealing means is provided between the inner peripheral surfaces of both ends of the pipe and the opposed surfaces of the spacer. In that it is made of wood. According to the above-mentioned characteristic configuration, the two elastic sealing members can be pre-assembled on the spacer side, so that the connection work of the two fluid transport pipes can be made more efficient.

[0009] A characteristic structure of the pipe joint structure according to claim 5 of the present invention is that the sealing means is formed in an annular shape interposed between opposing surfaces of the inner peripheral surface of both pipe ends and the outer peripheral surface of the spacer. It is characterized by comprising an elastic sealing material and an annular elastic sealing material interposed between the spacer and the inner surface of the butted portion of the two pipe ends. According to the above-mentioned characteristic configuration, it is possible to improve the sealing performance by using the elastic sealing materials disposed at three places between the inner peripheral surface of the both pipe ends and the outer peripheral surface of the spacer. Since these elastic sealing members can be pre-assembled on the spacer side, the efficiency of the connection work between the two fluid transport pipes can be improved.

The pipe joint structure according to a sixth aspect of the present invention is characterized in that the sealing means is interposed between the inner peripheral surfaces of the respective divided joints so as to extend over the outer peripheral surfaces of both pipe ends. In that it is composed of a plurality of elastic sealing materials. According to the above-mentioned characteristic configuration, even when the circumferential contact between the outer peripheral surfaces of the two pipe ends and the tapered surface of the split splicing member externally fitted thereto is uneven due to a manufacturing error, Correction can be made using the elastic sealing material interposed between the two.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] FIGS.
1 shows a first embodiment of a pipe joint structure according to the present invention, in which a pair of stainless steel fluid transport pipes (for example, gas pipes) 1 are each connected to a pipe end 2 to be connected to a peripheral edge. And the flared pipe ends 2 of the two fluid transport pipes 1 are connected to each other by a coaxial core X.
A connecting ring 3 composed of a plurality of (two in the present embodiment) divided connecting ring bodies 3A divided in the circumferential direction is fitted over both of the pipe ends 2 so as to face each other in the state. .

The connecting wheel 3 is provided with a fastening means 4 for connecting the split connecting wheel bodies 3A to each other in a state of being tightened to the reduced diameter side, and as shown in FIGS. On the inner peripheral surface of the ring body 3A, both pipe ends 2 are moved along the displacement of the divided connecting ring body 3A toward the diameter reducing side due to the tightening operation of the fastening means 4.
And a pair of tapered surfaces 5 for moving the pipes in close proximity to each other in abutting condition. 6 are provided.

Further, as shown in FIGS. 3 and 4, between the two pipe ends 2, the inner peripheral surface 2a of the two pipe ends 2 fixed in abutting condition by the fastening operation of the fastening means 4 is in contact. An annular spacer 7 made of stainless steel having a corresponding tapered receiving surface 7a is provided, and the inner peripheral surface 7b of the spacer 7 is the same as the inner peripheral surface 1a of the fluid transport pipe 1. It is configured to be continuous (or substantially continuous) with an inner diameter of (or substantially the same).

The inner peripheral surface of each of the divided connecting ring bodies 3A is formed as a V-shaped bent surface having a larger diameter toward the center in the width direction, and a pair of inclined surfaces constituting the bent surface are tapered. Surface 5 is configured. When the connecting ring 3 is fitted over both pipe ends 2, each tapered surface 5 comes into contact with the outer peripheral surface 2b of each pipe end 2 opposed thereto,
Each tapered surface 5 is formed at an inclination angle substantially along the outer peripheral surface 2b of each pipe end 2 facing the tapered surface 5.

The sealing means 6 comprises annular elastic sealing members 8, 8 interposed between the inner peripheral surface 2a of the two pipe ends 2 and the opposing surfaces of the spacer 7, respectively, and the two pipe ends 2; And an annular elastic sealing material 9 interposed between the inner surface of the butted portion of the above and the spacer 7. More specifically, the sealing means 6 includes two synthetic rubber annular first elastic seal members 8 interposed between the opposing surfaces of the inner peripheral surface 2 a of each pipe end 2 and the spacer 7. 8 and a second elastic sealing material 9 made of synthetic rubber interposed between the spacer 7 and the inner surface of the butted portion of the two pipe ends 2. 9. Further, each of the first elastic seal members 8 and 8 is previously fitted to an annular stepped portion 7c formed on each of both side surfaces of the spacer 7, and the second elastic seal member 9 is formed of a spacer. The sir 7 is externally fitted to the top outer peripheral surface 7d in advance.

When the connecting ring 3 is fitted over the two pipe ends 2, the connecting means 4 connects one adjacent end of the two split connecting rings 3 A to the axis X of the fluid transport pipe 1. A bolt 12 and a nut for tightening and connecting a hinge portion 10 that is swingably connected about a substantially parallel axis P and a flange portion 11 that is integrally formed at each of the other adjacent ends of the two split connecting rings 3A. 13.

That is, the connecting wheel 3 is formed of two split connecting bodies 3A.
12 and nut 1 for connecting flanges 11
3 are released, and the two split connecting ring bodies 3A are spread around the axis P of the hinge portion 10. In this state, the two split connecting ring bodies 3A are fitted over the two pipe ends 2 from outside in the pipe radial direction. I have.

When the bolt 12 is inserted through the two bolt insertion holes 14 formed in the flange portion 11 of the split connecting ring 3A, a nut 13 is screwed into the bolt 12 to perform a tightening operation. As a result of the tightening operation, the two divided connecting rings 3A are displaced to the reduced diameter side, and the tapered surfaces 5 of the two divided connecting rings 3A are flared with the displacement. 2b, a pressing force acts on these two pipe ends 2 so that the two pipe ends 2 move relatively close to each other in abutting state, and each of the first elastic sealing members 8 The second elastic seal material 9 is compressed between the opposing surfaces of the inner peripheral surface 2 a of the portion 2 and the spacer 7.
Is compressed between the inner surface of the butted portion of the two tube ends 2 and the spacer 7, and the space between the two tube ends 2 is sealed by these three elastic sealing members 8, 8, 9.

In the pipe joint structure constructed as described above, three elastic seals are disposed at three places between the inner peripheral surface 2a of the two pipe ends 2 and the outer peripheral surface of the spacer 7. Materials 8, 8, 9 can be used to seal between the two pipe ends 2, and the split joint 3A can be moved to the reduced diameter side by the tightening operation of the bolts 12 and nuts 13 constituting the fastening means 4. When the two pipe ends 2 are moved relatively close to each other by the pair of tapered surfaces 5 formed on the inner circumference of each of the divided connecting ring bodies 3A with the displacement, the inner peripheral faces of the flared two pipe ends 2 are moved. 2a and the tapered receiving surface 7a of the spacer 7 come into contact with each other from the tube axis direction, so that the two tube ends 2 can be joined while being corrected to a coaxial core. The peripheral surface 7b is continuous with the inner peripheral surface 1a of the fluid transport pipe 1 with the same (or almost the same) inner diameter. Or because they are configured to substantially continuously) to both tube end 2 which is fixed in a state abutting
The volume of the annular concave portion 15 formed on the inner peripheral surface 2a side can be reduced.

The flaring of the pipe end 2 may be performed at the connection work site of the fluid transport pipe 1 using a flaring tool, or before being carried into the connection work site.
The pipe end 2 of the fluid transport pipe 1 may be flared in advance.

[Second Embodiment] FIG. 7 shows a second embodiment of the pipe joint structure according to the present invention, in which the sealing means 6 is provided between the inner peripheral surface 2a of both pipe ends 2 and the spacer 7. It may be constituted by annular elastic seal members 8, 8 interposed between the opposing surfaces. More specifically, the sealing means 6 is provided at each pipe end 2.
Two synthetic rubber annular elastic seal members 8 interposed between opposing surfaces of the inner peripheral surface 2a and the spacer 7, respectively.
8. That is, in the first embodiment, the annular second elastic sealing material 9 interposed between the inner surface of the butted portion of the two pipe ends 2 and the spacer 7 may be omitted.

The other configuration is the same as that of the first embodiment. Components having the same configuration or the same function as the components described in the first embodiment are denoted by the same reference numerals and description thereof is omitted. .

Third Embodiment FIGS. 8 to 11 show a third embodiment of the pipe joint structure of the present invention.
A fastening means 4 is provided for connecting the two divided connecting bodies 3A to each other in a state of being tightened to the reduced diameter side, and an inner peripheral surface of each of the divided connecting rings 3A is associated with a tightening operation of the fastening means 4. A pair of tapered surfaces 5 are formed to move the two pipe ends 2 relatively close to each other as the split connecting ring body 3A is displaced toward the diameter reducing side. Sealing means 6 is provided for sealing between the two pipe ends 2 by pressing force on the pipe ends 2.

The sealing means 6 is interposed between the outer peripheral surfaces 2b of the two pipe ends 2 and the inner peripheral surface of each of the divided spliced bodies 3A, and is divided into a plurality of (in the circumferential direction). In this embodiment, two (2) synthetic rubber band-like elastic seal members 16 are provided. Further, each of the elastic sealing members 16, 16 is interposed between the outer peripheral surface 2b of the both pipe ends 2 and each of the divided joints 3A, and their adjacent ends 16a are connected to each of the divided joints. It is clamped between the hinge portions 10 and the flange portions 11 of the body 3A.

The inner peripheral surface of each of the divided connecting rings 3A is formed as a V-shaped bent surface having a larger diameter toward the center in the width direction, and a pair of inclined surfaces forming the bent surface are formed into a tapered shape. Surface 5 is configured. When the connecting ring 3 is fitted over both pipe ends 2, both tapered surfaces 5 come into contact with the outer peripheral surfaces of the elastic sealing members 16 and 16, and each tapered surface 5 is connected to the elastic sealing material 16 , 16 are formed at an inclination angle substantially along the outer peripheral surface 2b of each tube end 2 opposed thereto.

As in the first embodiment, the connecting ring 3 releases the threaded connection between the bolts 12 and the nuts 13 constituting the fastening means 4, and connects the two split connecting rings 3 A to the shaft center of the hinge portion 10. P
It is spread around and, in this state, is fitted over the two pipe ends 2 from outside in the pipe radial direction. Then, the two bolt insertion holes 14 formed in the flange portion 11 of the two divided connecting ring bodies 3A.
With the bolt 12 inserted through the
When the nut 13 is screwed into and tightened, the split connecting ring 3A is displaced toward the diameter reducing side with the tightening operation, and the tapered surface 5 of the split connecting ring 3A is moved with the displacement. By pressing and contacting the outer peripheral surface 2b of the flared pipe ends 2 via the respective elastic sealing materials 16, 16, a pressing force acts on these pipe ends 2, and the both pipe ends 2 are moved. The elastic sealing members 16, 16 are compressed between the opposing surfaces of the outer peripheral surface 2b of the tube end 2 and the tapered surface 5 while moving relatively close to each other in the abutting state and abutting in the coaxial core X state. The space between the two tube ends 2 is sealed by these elastic sealing materials 16, 16.

The other configuration is the same as that of the first embodiment. Components having the same configuration or the same function as the components described in the first embodiment are denoted by the same reference numerals and description thereof is omitted. .

[Other Embodiments] (1) The fluid transport pipe 1 is not limited to stainless steel, but may be, for example, steel, copper, or brass. The material of the connecting wheel 3 and the spacer 7 is preferably the same as the material of the fluid transport pipe 1. (2) The fluid transport pipe 1 is not limited to a gas pipe, but may be, for example, a water pipe. (3) The fastening means 4 is not limited to the structure described in each of the above embodiments.
A flange may be integrally formed at each of the one adjacent end and the other adjacent end of A, and the fastening means 4 may be constituted by bolts and nuts for tightening and connecting these opposed flanges. . (4) Instead of the nut constituting the fastening means 4, a female screw hole into which the bolt 12 constituting the fastening means 4 is screwed may be formed on one flange portion. (5) In the first embodiment and the second embodiment, an elastic sealing material is further interposed between the outer peripheral surfaces 2b of the two pipe ends 2 and the inner peripheral surface of each split connecting ring 3A. May be implemented.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing a first embodiment of a pipe joint structure of the present invention.

FIG. 2 is a side view

FIG. 3 is an enlarged sectional view of a main part showing an assembling procedure.

FIG. 4 is an enlarged sectional view of a main part.

FIG. 5 is a perspective view

FIG. 6 is a perspective view of a connecting wheel in a state where a split connecting wheel is swung.

FIG. 7 is an enlarged sectional view of a main part showing a second embodiment of the pipe joint structure of the present invention.

FIG. 8 is a front sectional view showing a third embodiment of the pipe joint structure of the present invention.

FIG. 9 is a side view.

FIG. 10 is an enlarged sectional view of a main part showing an assembling procedure.

FIG. 11 is an enlarged sectional view of a main part.

FIG. 12 is a cutaway front sectional view showing a conventional pipe joint structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fluid transport pipe 1a Inner peripheral surface 2 Pipe end 2a Inner peripheral surface 2b Outer peripheral surface 3 Joining ring 3A Split connecting ring 4 Fastening means 5 Tapered surface 6 Sealing means 7 Spacer 7a Receiving surface 7b Inner peripheral surface 8 Elastic sealing material 9 Elastic sealing material 15 Annular concave part 16 Elastic sealing material P axis X axis

Claims (6)

[Claims] 1. A pipe joint structure in which flared pipe ends of both fluid transport pipes are connected to each other in a sealed state in a sealed state, and a joint is fitted over both opposed pipe ends in a coaxial core state. The wheel is composed of a plurality of divided joints divided in the circumferential direction,
Fastening means is provided for connecting the divided splicing bodies to each other in a state of being tightened to the reduced diameter side, and the inner peripheral surface of each of the divided splicing bodies has a reduced diameter of the divided splicing body due to the tightening operation of the fastening means. Along with the displacement to the side, a pair of tapered surfaces are formed to move the two pipe ends relatively close to each other in abutting state, and furthermore, the two pipe ends are pressed by the pressing force of the fastening means by the tightening operation. A pipe joint structure provided with sealing means for sealing between pipe ends. 2. An annular spacer having a tapered receiving surface abutting on inner peripheral surfaces of both tube ends fixed in abutting state by a tightening operation of said fastening means. 1. The pipe joint structure according to 1. 3. An inner peripheral surface of the spacer is configured to be continuous or almost continuous with an inner peripheral surface of the fluid transport pipe at the same or substantially the same inner diameter.
The described pipe joint structure. 4. The sealing means according to claim 2, wherein said sealing means is formed of an annular elastic sealing material interposed between opposing surfaces of an inner peripheral surface of both pipe ends and a spacer. Pipe fitting structure. 5. The sealing means comprises an annular elastic sealing material interposed between opposing surfaces of an inner peripheral surface of the two tube ends and a spacer, respectively, and an inner surface of an abutting portion of the two tube ends. The pipe joint structure according to any one of claims 1 to 3, comprising an annular elastic sealing material interposed between the spacer and the spacer. 6. The seal means is composed of a plurality of elastic seals interposed between the outer peripheral surfaces of both pipe ends and the inner peripheral surfaces of the respective divided splicing bodies. 1
5. The pipe joint structure according to any one of items 1 to 4.