JP2000146041A - Coupling structure of pipe body, assembly method of pipe body, and packing for inner surface lining pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a worker's load of assembly work, and to obtain a sufficient sealing effect. SOLUTION: In this coupling structure, a packing 30 is provided between the inner surface of a coupling main body 1 and a pipe body 20, and a pressing body 10 externally inserted to the pipe body 20 for locking a circular ring 22 installed on the outer peripheral groove 21 of the pipe body 20 with wall surface 11, is moved for pressing a packing 30 by the screwing operation of a fastener 15 screwed to the end of the coupling main body 1. In this case, a circular projection 2 for locking the packing 30 is formed on the inner surface of the coupling main body 1, as well as the packing 30 is formed abuttingly on the peripheral surface and the end face of the pipe body 20, and the front end 12 of the pressing body 10 is thinly formed compared with the pacing 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure for a pipe, a method for assembling a pipe, and a method for connecting a pipe having a lining process to an inner surface thereof. The present invention relates to a packing for an inner lining pipe that is used when assembling the lining pipe.

[0002]

2. Description of the Related Art Conventionally, as a joint structure of a tubular body, FIG.
The invention described in Japanese Patent Application Laid-Open No. 7-119868 is known. The joint structure of a tubular body described in this publication includes a packing 5 between an inner surface of the joint body 50 and an outer peripheral surface of the tubular body 51.
3 is interposed, and a pressing body 58 fixed to the pipe body 51 with a screw 57 in a state where an annular ring 55 attached to an outer circumferential groove 54 of the pipe body 51 is locked on a wall surface 56 is connected to an end of the joint body 50. By the screwing of the tightening bodies 59 and 60 screwed to the parts, the joint body 5
The packing 53 is configured to move in a pressable manner via a movable ring 62 held by an O-ring 61 mounted on the inner surface of the “0”.

Accordingly, the annular ring 55 is locked to the wall surface 56 to prevent the tubular body 51 from being detached from the joint body 50, and the movable ring 61 presses the packing 53 by the pressing of the pressing body 58. The packing 53 expands in diameter, and the sealing effect is enhanced.

[0004]

However, the pipe joint structure described in the above publication has a large number of parts including the screw 57, the tightening body 60, the O-ring 61, and the movable ring 62. In addition to an increase in the burden on the operator in actual work, these parts are frequently lost or forgotten.

Further, since the packing 53 is in contact only with the outer peripheral surface of the tube 51, a sufficient sealing effect cannot be obtained. This becomes more remarkable as the diameter of the tube 51 increases.

Further, when an inner lining steel pipe is used, it is necessary to insert an anticorrosion core into the end of the pipe to prevent corrosion of the end of the pipe by a flowing fluid.
Further, since the work load becomes large and forgetting to attach frequently occurs, there is a demand for a joint structure of a tubular body that does not require an anticorrosion core.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and is intended to reduce a burden on an operator in an assembling operation and to obtain a sufficient sealing effect. And an assembling method thereof, and a packing for an inner surface lining pipe.

[0008]

In order to solve the above-mentioned problems, a joint structure for a pipe body according to the present invention comprises a packing 30 interposed between an inner surface of a joint body 1 and a pipe body 20; Body 2
The annular ring 22 attached to the outer peripheral groove 21 of the
The joint structure of the pipe body in which the pressing body 10 externally inserted into the pipe body 20 so as to be able to be locked by the tightening body 15 screwed to the end of the joint body 1 is capable of pressing the packing 30 by screwing. The packing 30 is formed in a shape capable of contacting the peripheral surface and the end surface of the pipe body 20, and an annular projection 2 for locking the packing 30 is formed on the inner surface of the joint body 1. Further, the distal end portion 12 of the pressing body 10 is formed to be thinner than the packing 30.

According to the joint structure for a pipe having the above-described structure, the inner peripheral surface of the joint body 1 and the pipe 2
The packing 30 is elastically displaced so that it expands by a part of the end face of a portion interposed between the outer peripheral surface of the packing 0 and the end face 12 of the pressing body 10 being pressed. Therefore, when the packing 30 expands, the packing 30 comes into close contact with the inner peripheral surface of the joint main body 1 and the outer peripheral surface of the tubular body 20.

When the annular ring 22 is locked on the wall 11, the pipe 20 moves with the movement of the pressing body 10.
And it elastically displaces so that it may be compressed by the end face of the pipe body 20 and the annular projection 2 of the joint main body 1. Therefore, when the packing 30 is compressed in the axial direction, the packing 30 comes into close contact with the end face of the annular projection 2 of the joint main body 1 and the end face of the tubular body 20.

As described above, leakage of the fluid flowing between the packing 30 and the inner surface of the joint body 1 and leakage of the fluid flowing between the packing 30 and the pipe 20 are completely prevented. Thus, a sufficient sealing effect of the packing 30 can be obtained.

Further, the joint structure of the tubular body according to the present invention can adopt a structure in which the distal end portion 12 of the pressing body 10 is formed in a tapered shape.
According to the joint structure for a tubular body according to claim 2 having such a configuration, the distal end 12 of the pressing body 10 is formed in a tapered shape, so that the packing 30 can be elastically displaced more easily and surely so as to expand the diameter. it can.

Further, the joint structure for a tubular body according to the present invention includes:
As described in claim 3, the inner surface of the pressing body 10 is a tubular body 2.
In order to enable the swing of 0, a configuration formed in a tapered shape can be adopted. According to the joint structure of the tubular body according to the third aspect having such a configuration, the swinging of the tubular body 20 is possible without impairing the sealing effect obtained as described above. Therefore, when an earthquake occurs, the shaking of the earthquake can be absorbed by the portion without leakage of the flowing fluid, and damage to the joint body 1 or the pipe body 20 can be prevented.

Further, in the joint structure for a tubular body according to the present invention, as described in claim 4, a structure in which the tightening body 15 is screwed by a hook spanner can be adopted. According to the joint structure for a tubular body according to claim 4 having such a configuration, the outer diameter of the tightening body 15 can be made smaller than that of the hexagonal head, and the surrounding area of the joint body can be reduced. When a mechanism for keeping heat is provided, the size of the mechanism can be reduced.

Further, in the method for assembling a pipe according to the present invention, the pressing body 10 externally inserted into the pipe 20 is moved by screwing the tightening body 15 screwed to the end of the joint body 1. Then, the packing 30 interposed between the inner surface of the joint body 1 and the pipe 20 is pressed, and then the wall surface 11 of the pressing body 10 is pressed.
And an annular ring 22 mounted in an outer circumferential groove 21 of the tube 20
When the tightening body 15 is further screwed from the state in which the packing 3 is in contact with the packing body 3, the packing 3 in a state in which the pressing body 10 and the end face of the pipe 20 are locked to the annular projection 2 on the inner surface of the joint body 1.
It is characterized by pressing 0.

According to the above-mentioned method of assembling the tubular body, first,
The pressing body 10 presses a portion of the packing 30 that is interposed between the inner peripheral surface of the joint main body 1 and the outer peripheral surface of the tubular body 20 to elastically displace the packing 30 so as to expand. The inner peripheral surface of the joint body 1 and the outer peripheral surface of the tube 20 are brought into close contact with each other.

Then, the movement of the pressing body 10 proceeds, and the state in which the wall surface 11 of the pressing body 10 and the annular ring 22 attached to the outer peripheral groove 21 of the tube 20 are in contact with each other is further tightened.
Is screwed to move both the pressing body 10 and the pipe 20 so that the packing 30 is compressed by the distal end portion 12 of the pressing body 10 and the end face of the pipe 20 and the annular projection 2 of the joint body 1. It is elastically displaced and is brought into close contact with the end face of the annular projection 2 of the joint body 1 and the end face of the tube 20.

As described above, leakage of the circulating fluid between the packing 30 and the inner surface of the joint body 1 and leakage of the circulating fluid between the packing 30 and the pipe 20 are completely prevented. Thus, a sufficient sealing effect of the packing 30 can be obtained.

Further, as in the prior art, the pressing body 10 is
A screw for fixing to zero, a tightening body for moving the pressing body 10, a movable ring for pressing the entire end face of the packing 30, and an O-ring for holding the movable ring are not required. Thus, the number of parts is reduced, and the burden on the operator in the assembling work can be reduced.

The packing for an inner lining pipe according to the present invention is a packing for an inner lining pipe interposed between the inner surface of the joint body 1 and the pipe body 20, wherein the packing for the inner lining pipe is provided.
0, the outer peripheral surface, the end surface, and the inner peripheral surface. According to the packing for an inner lining tube having such a configuration, if the packing is fitted to the end of the tube 20, the outer peripheral surface, the end surface, and the inner peripheral surface of the tube 20 will be covered with the packing. The same anticorrosion effect can be obtained without attaching a conventionally employed anticorrosion core. Accordingly, it is possible to suitably prevent the tubular body from being inadvertently corroded due to forgetting to attach the anticorrosion core, and to reduce the number of parts and the work load.

[0021]

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2, reference numeral 1 denotes a tubular joint body made of steel, and an annular projection 2 capable of engaging a packing 30 is formed substantially at the center of the inner surface of the joint body 1; Sealing with the steel pipe 20 (steel pipe) inserted into the joint body 1 is achieved.

Numeral 10 denotes a cylindrical pressing body which is extrapolated to the tube body 20, and has a tapered wall surface 11 formed on the inner surface thereof.
Can be brought into contact with an annular ring 22 mounted in an outer peripheral groove 21 which is formed in the outer peripheral surface of the tube 20 in a circumferential shape.

The pressing body 10 is disposed with a gap between the inner surface of the joint body 1 and the outer peripheral surface of the pipe 20. The tip 12 is formed to be thinner than the packing 30. The end face is formed in a tapered shape, and abuts on the large diameter side of the rear end face of the packing 30.

Further, of the inner peripheral surface of the pressing body 10,
The portion excluding the distal end portion 12 and the wall surface 11 is formed parallel to the outer peripheral surface of the tube 20 at a predetermined interval from the wall surface 11,
From there, the tube body 20 becomes farther away from the annular ring 22.
Is formed in a gently tapered shape that is separated from the outer peripheral surface of.

Reference numeral 15 denotes a tightening member having an inner hole 16 through which the tube body 20 can be inserted, and screwing to the external threads 3 and 3 engraved at the end of the joint main body 1, the inner end surface of which is pressed. It comes into contact with the rear end face of the body 10.

Further, by forming a plurality of recesses 17 at equal positions on the outer peripheral surface of the tightening body 15, projections 18, which can lock the tip of a hook spanner, are formed. .

On the other hand, at the center of the outer peripheral surface of the tightening body 15, a protrusion capable of engaging the tip of a hook spanner to prevent the joint body 1 from rotating around when the tightening body 15 is screwed. .. Are formed.

The annular ring 22 is formed as shown in FIG.
A spring 22b is wound around the entire surface of a core material 22a having a substantially circular cross section divided into three parts by the cutting portion 22c, and is a perfect circular endless annular ring body formed to be expandable and contractable. Is a state in which an elastic force is applied inwardly to the outer peripheral groove 21 provided on the outer peripheral surface on the distal end side of the tubular body 20, that is,
The annular ring 22 is mounted in an expanded state.

As shown in FIG. 4, the packing 30 includes a substantially cylindrical insertion portion 31 and a flange portion 32 projecting from one end of the insertion portion 31 to the inner diameter side. It is a packing which has a shape and can contact the outer peripheral surface and the end surface of the tubular body 20.

The inner peripheral surface of the insertion portion 31 and the flange 3
An annular wall 33 is provided on the outer end face of the second member 2 so as to protrude over the entire circumference.

The annular wall 33 is formed to be thinner toward the tip and has a substantially triangular cross-section, and has an outer peripheral surface 34 of the annular wall 33 and an inner peripheral surface of the insertion portion 31 or an outer end surface of the flange portion 32. Is formed between the inner peripheral surface 35 of the annular wall 33 and the insertion portion 3.
1 is formed to be larger than the angle β formed between the inner peripheral surface 1 and the outer end surface of the flange portion 32. Specifically, the angle α is 135
The angle β is 90 degrees, and the apex angle of the tip of the annular wall 33 is 45 degrees.

Further, the annular wall 33 has an insertion portion 31
An annular recess 36 recessed from the inner peripheral surface or the outer end surface of the flange 32 is adjacent to the recess 36, and the recess 36 is formed in the same shape as the annular wall 33 and in opposite shapes to each other.

On the large-diameter side of the rear end surface of the insertion portion 33 of the packing 30, a chamfered portion 37 is formed which is parallel to the tapered surface of the distal end portion 12 of the pressing body 10.
The packing 30 is prevented from being cracked and damaged by the local load caused by the tip 12 of the packing 30.

The chamfered portion 38 formed on the small diameter side of the rear end face of the insertion portion 33 of the packing 30 abuts on the outer peripheral surface of the annular ring 22 so that the annular ring 22 is
It is for preventing auxiliary | assistance from leaving | separating from an auxiliary | assistant.

The joint structure of the tubular body according to the present embodiment has the above-described structure, and a method of assembling the same will be described below with reference to FIG. First, the fastening body 15 and the pressing body 1
After the outer ring 0 is extrapolated and the annular ring 22 is attached to the outer peripheral groove 21, the packing 30 is externally fitted to the end of the tube 20. In such a state, the tightening body 15 and the pressing body 10 can freely move along the longitudinal direction of the tube 20, while the annular wall 33 of the packing 30 on the insertion portion 31 side is bent to form an adjacent recess. The inside of the packing 30 is fitted into the portion 36, and the packing 30 comes into contact with the outer peripheral surface and the end surface of the tubular body 20.

Then, after inserting the pipe body 20 from the end of the joint body 1 to the inside, the fastening body 15 is screwed to the end of the joint body 1. Then, the pressing body 10 becomes the fastening body 15
Is pressed and moved by the screwing of
2 presses the large diameter side of the end face of the packing 30. Then, the packing 30 is elastically displaced by the pressing body 10 so as to expand, so that the packing 30 comes into close contact with the inner peripheral surface of the joint body 1 and the outer peripheral surface of the tube 20.

Thereafter, the movement of the pressing body 10 proceeds, and the tightening body 15 is further screwed from the state where the wall surface 11 of the pressing body 10 and the annular ring 22 are in contact with each other.
And the pipe body 20 move together, and the packing 30
Is locked by the annular projection 2, the annular wall 33 of the flange 32 is bent and fitted into the adjacent recess 36, and the distal end 12 of the pressing body 10 and the end face of the tube 20 and the joint body are Elastically displaced so as to be compressed by the first annular projection 2,
The end surface of the annular projection 2 of the joint body 1 and the end surface of the tube 20 are brought into close contact with each other.

Therefore, according to the pipe joint structure and the method of assembling the same according to the present embodiment, the packing 30 is formed by the pressing body 10.
And the packing 30 is elastically displaced so that the packing 30 is compressed between the end face of the tube 20 and the inside of the joint body 1, so that the gasket passes between the packing 30 and the inner surface of the joint body 1. There is an advantage that a sufficient sealing effect can be obtained by completely preventing leakage of the circulation fluid and leakage of the circulation fluid between the packing 30 and the pipe 20.

Further, the inner surface of the pressing body 10 is
Are formed in a tapered shape so as to allow the rocking of the gasket, and the surface of the packing 30 that contacts the inner surface of the joint body 1 and the surface of the packing 30 that contacts the outer surface of the pipe body 20 project over the entire circumference. Since the annular wall 33 is formed, for example, when an earthquake occurs, the pipe 2
0 can be allowed to prevent breakage of the connecting portion between the joint body 1 and the pipe body 20, and the joint body 1
In contrast, even if the pipe 20 is misaligned, the annular wall 33 prevents leakage of the flowing fluid to the outside, so that the sealing property between the joint body 1 and the pipe 20 is ensured, and the leakage can be reliably prevented. It has the advantage that.

It should be noted that the present invention is not limited to the above-described embodiment, and various changes can be made. For example, the pipe body 30 is not limited to a steel pipe as in the above embodiment, but is a thin pipe of FIG. 6, a stainless steel pipe of FIG. 7, a resin pipe of FIG. 8, an inner lining steel pipe of FIG. 9, and a thin inner lining steel pipe of FIG. It may be.

Further, the packing 30 shown in FIG. 11, that is, the inner peripheral surface of the insertion portion 31, which is farther from the flange 32 than the packing 30 shown in FIG. Packing 30 having annular walls 33, 33 formed on end faces
Is applicable to stainless steel pipes, thin-walled pipes, steel pipes, and resin pipes. The packing 30 shown in FIG. 12, that is, the packing 30 in which annular protrusions 33 and 33 are formed on the inner and outer end surfaces of the flange 32.
Is applicable to steel pipes and resin pipes. Further, the annular projection 3 is provided on the packing 30 in FIG.
The packing 30 in which the third and third flanges 33 are formed and which project perpendicularly from the tip of the flange 32 and in which the second flange 38 is in contact with the inner peripheral surface of the tube 20 is formed of an inner lining steel pipe, a thin inner lining. It is applicable to a steel pipe, and in such a case, the packing 30 can contact the outer peripheral surface, the end surface, and the inner peripheral surface of the inner lining steel pipe or the thin inner lining steel pipe to prevent corrosion of the pipe body. . Even when any one of these packings 30 is used, in order to restrict the movement of the packing 30 due to the pressing of the end face of the tube 20 and to obtain a suitable compressing action, the annular projection of the joint main body 1 is required. It is preferable that the protrusion amount of No. 2 is set to be equal to or longer than the length of the flange portion 32 of the packing 30.

Further, as shown in FIG. 14, the annular ring 22 is a ring main body 22a having a perfect circular cross section, the ring main body 22a has cut portions 22c at three places, and a thread groove is formed on the outer periphery. The small diameter portion 22e provided is formed,
Reference numeral 22b denotes a spring wound around the valley of the thread groove on the outer periphery of the small diameter portion 22e. The spring 22b may be formed in a perfect circular endless annular shape and capable of expanding and contracting.

The specific configuration such as the shape of the joint body 1 can be arbitrarily changed in design within the range intended by the present invention.

Further, the formation position of the annular wall 33 of the packing 30 is not limited to any of the above-mentioned packings. The point is that the annular wall 33 is formed between the inner surface of the joint body 1 and the pipe 2.
0 and the outer surface of the pipe body 20, the leakage of the flowing fluid between the packing 30 and the inner surface of the joint body 1 and the flowing fluid between the packing 30 and the outer surface of the pipe 20 Can be suitably prevented, and a double sealing effect can be obtained. However, by forming the annular wall 33 in the insertion portion 31 of the packing 30, the packing 30 expands in diameter at this portion, and the resistance when the tube 20 is inserted into the joint body 1 becomes large. The annular wall 33 is provided for the packing 3.
More preferably, it is formed on the zero flange 32.

As a method for assembling the tube 20, in the above-described embodiment, the tube 20 is inserted into the joint body 1 with the packing 30 fitted on the end of the tube 20,
The present invention is not limited to this, and a method of inserting the tube 20 into the joint body 1 after the packing 30 is inserted into the joint body 1 is also intended by the present invention.

[0047]

As described above, according to the joint structure for a pipe body according to the present invention, the packing is elastically displaced so as to expand by the pressing body, and the packing is formed between the end face of the pipe body and the inside of the joint body. Since it is elastically displaced so as to be compressed, leakage of the flowing fluid between the packing and the inner surface of the joint body, and leakage of the flowing fluid between the packing and the pipe body are completely prevented, and a sufficient A sealing effect can be obtained.

[Brief description of the drawings]

FIG. 1 is a half sectional view of a joint structure for a pipe body showing an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part showing an assembled state of the tubular body of the embodiment.

3A and 3B show an annular ring of the embodiment, wherein FIG. 3A is a front view, and FIG.

4A and 4B show a packing according to the embodiment, wherein FIG. 4A is an overall sectional view, and FIG.

FIG. 5 is an enlarged sectional view of a main part showing a state before assembly of the tubular body of the embodiment.

FIG. 6 is an enlarged sectional view of a main part showing an assembled state of a thin-walled tube.

FIG. 7 is an enlarged sectional view of a main part showing an assembled state of a stainless steel pipe.

FIG. 8 is an enlarged sectional view of a main part showing an assembled state of a resin pipe.

FIG. 9 is an enlarged sectional view of a main part showing an assembled state of the inner lining steel pipe.

FIG. 10 is an enlarged sectional view of a main part showing an assembled state of a thin inner lining steel pipe.

11A and 11B show a packing according to another embodiment, wherein FIG. 11A is an overall sectional view and FIG. 11B is an enlarged sectional view of a main part.

FIG. 12 shows a packing according to another embodiment, in which (A) is an overall sectional view and (B) is an enlarged sectional view of a main part.

13A and 13B show a packing according to another embodiment, wherein FIG. 13A is an overall cross-sectional view, and FIG.

FIGS. 14A and 14B show the annular ring of the embodiment, wherein FIG. 14A is a front view, and FIG.

FIG. 15 is an enlarged sectional view of a main part showing a conventional joint structure of a tubular body.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Joint main body, 2 ... Annular protrusion, 3 ... Male screw, 10 ... Pressing body, 11 ... Wall surface, 12 ... Tip part, 15 ... Tightening body, 16 ...
Inner hole, 17 recess, 18 protrusion, 20 pipe, 21
Outer peripheral groove, 22 ... annular ring, 30 ... packing, 31 ... insertion part, 32 ... flange, 33 ... annular wall, 34 ... outer peripheral surface, 35
Inner peripheral surface, 36 ... recessed portion, 37, 38 ... chamfered portion, 38 ...
Second brim

Claims (6)

[Claims] An annular ring (30) is provided between an inner surface of a joint body (1) and a pipe (20), and is fitted in an outer circumferential groove (21) of the pipe (20). A pressing body (10) externally inserted into the pipe (20) so that the pipe body (22) can be locked on the wall surface (11) is screwed to the end of the joint body (1) by the screwing of the tightening body (15). The joint structure of the pipe body which moves the packing (30) so as to be able to be pressed by the packing (3)
0) is formed in a shape capable of contacting the peripheral surface and the end surface of the pipe (20), and the annular projection (2) for locking the packing (30) on the inner surface of the joint body (1). ), And the distal end (12) of the pressing body (10) is formed to be thinner than the packing (30). 2. A tip (12) of the pressing body (10).
The joint structure for a tubular body according to claim 1, wherein the joint is formed in a tapered shape. 3. An inner surface of the pressing body (10) is a tubular body (2).
The joint structure for a tubular body according to claim 1 or 2, wherein the joint structure is formed in a tapered shape so as to enable the swing of (0). 4. The joint structure for a tubular body according to claim 1, wherein the fastening body (15) is screwed by a hook spanner. 5. A pressing body (10) externally inserted in a pipe (20) is moved by screwing a tightening body (15) screwed to an end of the joint body (1), The packing (30) interposed between the inner surface of the joint body (1) and the pipe (20) is pressed, and thereafter, the wall surface (11) of the pressing body (10) and the outer periphery of the pipe (20) The annular ring (2) mounted in the groove (21)
When the tightening body (15) is further screwed from the state where the abutment with (2) is in contact with the pressing body (10) and the end faces of the tubular body (20), the annular projection ( 2) A method of assembling a tubular body, wherein the packing (30) in a state locked in (2) is pressed. 6. A packing for an inner lining pipe interposed between an inner surface of a joint body (1) and a pipe (20), wherein an outer peripheral face, an end face, and an inner circumference of the pipe (20) are provided. A packing for an inner lining pipe, which is formed in a shape capable of contacting a surface.