JP3060593U - Pipe joint structure - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To reduce a burden on an operator in an assembling operation and to obtain a sufficient sealing effect. SOLUTION: A screwing body 9 externally inserted into both ends is screwed to both sides of a joint body 5 into which opposite ends of a pair of pipes 1 are inserted. 5 between the thick part 5 b of the joint body 5.
Annular first pressing body 6 provided on the inner peripheral surface of
While being pressed by a cylindrical second pressing member 7 provided on the outer peripheral surface of the end portion, while the grooves 3 on the outer peripheral surface at both ends are pressed by the second pressing member 7.
The two pipes 1 are connected by pressing the ring 2 attached to the, and the ends of both the tightening members 9 are located at the thick portion 5b.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a joint structure of a pipe applied when connecting various pipes.

[0002]

[Prior art]

 Conventionally, as a joint structure of a tubular body, a device shown in FIG. 9 and disclosed in Japanese Patent Application Laid-Open No. 7-119868 is known. In the joint structure of a tubular body described in this publication, a packing 53 is interposed between an inner peripheral surface of a steel joint body 50 and an outer peripheral surface of the tubular body 51, and is attached to an outer peripheral groove 54 of the tubular body 51. The pressing body 58 fixed to the pipe body 51 with the screw 57 while the annular ring 55 is locked on the wall surface 56 is screwed by the tightening bodies 59 and 60 screwed to the end of the joint body 50. Thus, the packing 53 is configured to move so as to be able to press through the movable ring 62 held by the O-ring 61 mounted on the inner peripheral surface of the joint main body 50.

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. As a result, the packing 53 expands in diameter, and the sealing effect is enhanced.

[0004]

[Problems to be solved by the invention]

 However, in the pipe joint structure described in the above-mentioned publication, the number of parts including the screw 57, the fastening body 60, the O-ring 61, and the movable ring 62 is large, so that the burden on the operator in actual work is increased. At the same time, these parts are frequently lost or forgotten.

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

Therefore, the present invention has been made in view of the above-described conventional problems, and reduces the burden on the operator in the assembling work and can obtain a sufficient sealing effect. It is an object to provide a structure.

[0007]

[Means for Solving the Problems]

 In order to solve the above problem, a joint structure for a tubular body according to claim 1 is provided on both sides of a joint body 5 into which both opposing ends of a pair of tubular bodies 1 are inserted. By screwing the attachment 9, the packing 4 provided between the both end portions and the joint main body 5 is connected to the annular first body provided on the inner peripheral surface of the thick portion 5 b of the joint main body 5. Pressing is performed by the pressing body 6 and a cylindrical second pressing body 7 provided on the outer peripheral surfaces of the ends of the two tubular bodies 1, while the second pressing body 7 is mounted in the grooves 3 on the outer peripheral surfaces of both ends. The two rings 1 are connected by pressing the formed ring 2, and the ends of the tightening members 9 are positioned at the thick portions 5 b.

In the joint structure for a tubular body according to a second aspect, the tightening body 9 and the cylindrical second pressing body 7 are extrapolated to opposing ends of the pair of tubular bodies 1, respectively, and the both ends are provided. The ring 2 is mounted on the groove 3 of the outer peripheral surface, and the packing 4 is externally fitted on the end surface of the both ends and the outer peripheral surface of the end. In this state, the both ends are thin-walled on both sides of the steel joint body 5. The first annular pressing body 6 made of resin inserted into the thick portion 5b at the center of the joint body 5 is inserted into the joint portion 5a, and abuts against the end face contact portion 4a of the packing 4; The cylindrical mounting portion 9a of the attachment 9 is screwed into the thin portions 5a of the joint body 5, and the annular pressing portion 9b of the tightening member 9 is pressed against the second pressing member 7, and The two pressing bodies 7 are pressed against the ring 2, and the packing 4 is pressed against the two pressing bodies 6 and 7 to connect the two pipes 1. The end of the mounting portion 9a is located at the thick portion 5b.

According to these inventions, the packing 4 is pressed from the end faces of the two tubular bodies 1 by the annular first pressing body 6 provided on the inner peripheral surface of the thick part 5 b of the joint body 5. At the same time, the packing 4 is elastically displaced so that it expands, because the second pressing body 7 provided on the outer peripheral surface of the end portion of the two tubular bodies 1 presses from the outer peripheral surface side of the end portion. 5 comes into close contact with the inner peripheral surface of the tubular body 1 and the outer peripheral surface of the end portion.

Further, the second pressing body 7 presses the ring 2 fitted in the groove 3 on the outer peripheral surface of the end portion of both the tubular bodies 1, so that the tubular body 1 moves with the movement of the second pressing body 7. Therefore, the packing 4 is elastically displaced so as to be compressed by the end faces of the second pressing body 7 and the tubular body 1 and the first pressing body 6 of the joint body 5. Accordingly, the packing 4 is compressed in the axial direction, so that the packing 4 comes into close contact with the end face of the first pressing body 6 of the joint main body 5, the end face of the tubular body 1, and the outer peripheral face of the end portion.

As described above, leakage of the flowing fluid between the packing 4 and the inner peripheral surface of the joint body 5 and leakage of the flowing fluid between the packing 4 and the pipe 1 are completely prevented. Thus, a sufficient sealing effect of the packing 4 can be obtained.

Further, since the first pressing body 6 and the joint main body 5 are separate bodies, the cost is reduced as compared with the case where the first pressing body 6 is formed integrally with the joint main body 5. Moreover, since the first pressing body 6 is provided on the inner peripheral surface of the steel joint body 5, the inner peripheral surface does not directly contact the fluid flowing through the two pipes 1. There is no rust on the peripheral surface. It is preferable to press-fit the first pressing body 6 into the inner peripheral surface of the steel joint body 5, and in this case, the inner peripheral surface and the first pressing body 6 come into close contact with each other to improve the rust prevention effect. be able to.

Further, since the end of the mounting portion 9 a of the fastening body 9 is located at the thick portion 5 a of the joint body 5, the strength of the boundary between the thin portion 5 b and the thick portion 5 a of the joint body 5 is reduced. The joint 9 can be reinforced by the mounting portion 9a of the tightening body 9, and a sufficient strength of the connecting portion between the joint body 5 and the pipe 1 can be secured. Further, the strength of the boundary portion between the thin portion 5b and the thick portion 5a of the joint body 5 can be reinforced by the end of the mounting portion 9a of the tightening body 9, so that the overall thickness of the joint body 5 is reduced. be able to.

Further, as in the prior art, a screw for fixing the second pressing body 7 to the tube 1, a fastening body for moving the second pressing body 7, and a movable body for pressing the entire end face of the packing 4. Since the ring and the O-ring for holding the movable ring are not required, the number of parts is reduced, and the burden on the operator in the assembling work can be reduced.

[0015]

[Embodiment of the invention]

 Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

First, in FIGS. 1 and 2 showing a joint structure of a pipe, reference numeral 1 denotes a pair of steel pipes (steel pipes), and reference numeral 2 denotes a groove 3 on the peripheral surface of the opposite end of both pipes 1. The mounted ring 4 is a packing, and has an end surface contact portion 4a that comes into contact with the end surfaces of the two tubular bodies 1 and an end outer peripheral surface contact portion 4b that comes into contact with the outer peripheral surfaces of the end portions of both the tubular bodies 1. The distal end of the outer peripheral surface abutting portion 4 b is in contact with the ring 2. Reference numeral 5 denotes a steel joint main body. The ends of the two pipes 1 are inserted into the thin portions 5a on both sides, and the thin portions 2a cover the end outer peripheral surface contact portions 4b and the rings 2. Reference numeral 6 denotes an annular first pressing member made of resin, which is press-fitted into the inner peripheral surface of a thick portion 5b formed at the center of the joint body 5, and the end surface of the first pressing member 6 is brought into contact with the end surface of the packing 4. It is in contact with the portion 4a.

Reference numeral 7 denotes a cylindrical second pressing member provided between the end of the thin portion 5 a of the joint main body 5 and the two pipes 1. Reference numeral 8 denotes a distal end of the second pressing member 7, The inner peripheral surface 8a of the distal end portion 8 is in contact with the ring 2 and the tapered end surface 8b of the inner peripheral surface 8a is It is in contact with the end surface of the end outer peripheral surface contact portion 4b. Reference numeral 9 denotes two tightening bodies, each of which comprises a cylindrical mounting portion 9a and an annular pressing portion 9b formed at an end of the mounting portion 9a. And the pressing portion 9b is in pressure contact with the second pressing body 7.

As shown in FIG. 3, the ring 2 is provided with a spring 22 wound all around the surface of a core material 21 having a substantially perfect circular cross section divided into three by a cutting portion 20 so that the ring 2 can expand and contract. Is formed. The ring 2 is mounted in a state where an elastic force is applied inward to the groove 3, that is, in a state where the ring 2 is expanded.

As shown in FIGS. 4 and 5, the packing 4 includes a plurality of annular walls 40 on the inner peripheral surface of the end outer peripheral surface contact portion 4b and the outer end surface of the end surface contact portion 4a. Is protruding all around. The annular wall 40 is formed in a substantially triangular shape in a sectional view, which is thinner toward the distal end.

Further, the annular wall 40 is adjacent to an annular recess 41 which is recessed from the inner peripheral surface of the end outer peripheral surface contact portion 4b or the outer end surface of the end surface contact portion 4a. 41 is formed in the same shape as the annular wall 40 and in opposite shapes to each other.

A chamfered portion 42 is formed on the end surface of the end outer peripheral surface contact portion 4 a in parallel with the tapered end surface 8 b of the distal end portion 8 of the second pressing body 7. The packing 4 is prevented from being cracked and broken by the local load caused by the tip 8 of the packing 7.

The chamfered portion 43 formed on the small-diameter portion side of the end surface of the end portion outer peripheral surface contact portion 4 b of the packing 4 comes into contact with the outer peripheral surface of the ring 2, and the ring 2 is detached from the tube 1. This is to assist in preventing

A plurality of recesses 9 c and protrusions 9 d are formed at equal intervals on the outer peripheral surface of the tightening body 9. The recesses 9 c and the protrusions 9 d are hooked on these recesses 9 c and the protrusions 9 d so that the tip of the spanner can be locked. I have.

A plurality of projections 90 are formed at the center of the outer peripheral surface of the tightening body 9 so that the tip of a hook spanner can be locked. Is prevented.

Next, a procedure for connecting the two pipes 1 using the joint of the present invention will be described. First, the tightening body 9 and the second pressing body 7 are extrapolated to both the pipes 1, and then the ring 2 is attached to the groove 3 of the both pipes 1, and then packing is applied to the ends of the both pipes 1. 4 is externally fitted. In such a state, the fastening body 9 and the second pressing body 7 can move freely along the longitudinal direction of the tubular body 1, while the annular wall 40 on the end outer peripheral surface abutting portion 4 b side of the packing 4. Is bent and fitted into the adjacent recess 41, and the inner peripheral surface of the end surface contact portion 4 a and the end outer peripheral surface contact portion 4 b of the packing 4 is in contact with the end surface and the outer peripheral surface of the tube 1. become

Then, the two pipes 1 are inserted into both the thin portions 5 a of the joint body 5, and the end faces of the two pipes 1 are brought into contact with both end faces of the first pressing body 6. Next, the two tightening bodies 9 are screwed to the thin portions 5a of the joint body 5. Then, the second pressing body 7 is pressed and moved by screwing of the tightening body 9, and the end face 8 b of the distal end 8 of the second pressing body 7 is connected to the end face of the end outer peripheral surface contact part 4 b of the packing 4. Press. Then, the packing 4 is elastically displaced so as to be expanded by the pressing of the pressing members 6 and 7, and comes into close contact with the inner peripheral surface of the joint main body 5 and the outer peripheral surface of both pipes 1.

After that, the movement of the second pressing body 7 proceeds, and from the state where the inner peripheral surface 8a of the second pressing body 7 is in contact with the ring 2, the two tightening bodies 9 are further screwed. , The second pressing body 7 and the two pipes 1 move together, the packing 4 is elastically displaced by the two pressing bodies 6 and 7 so as to be compressed, and the annular wall 40 of the end face contact portion 4a is bent. It fits in the adjacent recess 41 and comes into close contact with both end surfaces of the first pressing body 6 and the end surfaces of both pipes 1. In a state where both the tightening bodies 9 are tightened, the mounting portion 9 a of the both tightening bodies 9 is located at the thick portion 5 b of the tightening body 5.

Therefore, according to the joint structure of the tubular body and the method of assembling the tubular body, the packing 4 is elastically displaced so as to expand by the pressing members 6 and 7, and the packing 4 is the end face of the tubular body 1. Is elastically displaced so as to be compressed into the inside of the joint body 5, leakage of the flowing fluid between the packing 4 and the inner peripheral surface of the first pressing body 5 a, and the communication between the packing 4 and the pipe 1 Leakage of the flowing fluid through the space can be completely prevented, and a sufficient sealing effect can be obtained.

Further, since the first pressing body 6 and the joint main body 5 are separate bodies, the cost is reduced as compared with the case where the first pressing body 6 is formed integrally with the joint main body 5. Moreover, since the first pressing body 6 is press-fitted into the inner peripheral surface of the steel joint body 5, the inner peripheral surface and the first pressing body 6 are in close contact with each other, and the inner peripheral surface is in contact with the two pipe bodies 1. There is no direct contact with the fluid flowing inside, and no rust is generated on the inner peripheral surface. Therefore, the number of times of maintenance can be reduced. Further, since the end of the mounting portion 9a of the tightening body 9 is located at the thick portion 5a of the joint body 5, the strength of the boundary portion between the thin portion 5b and the thick portion 5a of the joint body 5 is reduced by tightening. The joint 9 can be reinforced by the attachment portion 9a of the body 9, and a sufficient strength of a connection portion between the joint body 5 and the pipe 1 can be secured. Further, the strength of the boundary portion between the thin portion 5b and the thick portion 5a of the joint body 5 can be reinforced by the end of the mounting portion 9a of the tightening body 9, so that the overall thickness of the joint body 5 is reduced. Thus, the diameter of the joint body 5 can be reduced, and the appearance can be improved.

The inner peripheral surface of the second pressing member 7 is formed in a tapered shape so as to allow the pipe 1 to swing, and the end contact portion 4 a of the packing 4 and the end portion are formed. Since the annular walls 40 projecting over the entire circumference are formed on the surface of the outer peripheral surface abutting portion 4b, for example, at the time of an earthquake, the pipe body 1 is allowed to sway with respect to the joint body 5, and The connection portion with the pipe 1 can be prevented from being damaged, and the annular wall 40 prevents leakage of the flowing fluid to the outside even if the pipe 1 is misaligned with respect to the joint body 5 due to shaking. There is an advantage that the sealing performance between the joint body 5 and the tube 1 is ensured, and leakage can be reliably prevented.

The present invention is not limited to the above-described embodiment, and various changes can be made. For example, although the first pressing body 6 is press-fitted into the thick portion 5a of the joint main body 5, the present invention is not limited to the press-fitting and may be fixed by bonding or the like. In addition, convex portions may be formed on both peripheral edges of the first pressing body 6, and the convex portions may be fitted into gaps between the thick portions 5 a and the ends of the two tubular bodies 1. However, in consideration of the adhesion between the thick portion 5a of the joint main body 5 and the first pressing body 6, the press-fitting and the fixing are more preferable. The material of the first pressing body is not limited to resin, but may be stainless steel as long as it has a rust-preventing effect. Further, the pipe body 1 is not limited to a steel pipe as in the above embodiment, but may be a thin-walled pipe, a stainless steel pipe, a resin pipe, an inner lining steel pipe, or a thick inner lining steel pipe shown in FIG. Reference numeral 10 in the figure denotes a lining surface formed on the inner surface of the tube 1.

Further, an annular projection 32 is formed on the packing 30 in FIG. 7, that is, the outer end face of the end face contact part 31, and protrudes orthogonally from the tip of the end face contact part 31, so that the inner periphery of the tube 1 is formed. The packing 30 having the inner peripheral surface abutting portion 33 in contact with the surface is applicable to the inner lining steel pipe and the thick inner lining steel pipe shown in FIG. Then, the packing 30 is in contact with the outer peripheral surface, the end surface, and the inner peripheral surface of the inner lining steel pipe or the thick inner lining steel pipe, so that corrosion of the pipe body 1 can be prevented. This packing 30 can achieve the same anti-corrosion effect without attaching a conventionally used anti-corrosion core, and can suitably prevent the tubular body 1 from being inadvertently corroded due to forgetting to attach the anti-corrosion core. In addition to reducing the number of parts, the work load can be reduced. Even when any of the above packings is used, in order to restrict the movement of the packing due to the pressing of the end face of the tubular body 1 and to obtain the compressing action suitably, It is preferable that the thickness of the one pressing body 6 is set to be equal to or larger than the thickness of the end face contact portion of the packing.

Also, the specific configuration such as the shape of the joint main body 5 can be arbitrarily changed within the range intended by the present invention.

Further, the formation position of the annular wall 40 of the packing 4 is not limited to that of the packing 4, but the point is that it is between the inner peripheral surface of the joint body 5 and the outer periphery of the pipe 1. If one is formed between the packing 4 and the inner surface of the joint body 5, leakage of the flowing fluid between the packing 4 and the inner peripheral surface of the joint body 5, and between the packing 4 and the outer peripheral surface of the pipe 1 are formed. Leakage of the flowing fluid can be suitably prevented, and a double sealing effect can be obtained. However, by forming the annular wall 40 at the end outer peripheral surface abutting portion 4b of the packing 4, the packing 4 expands in diameter at this portion, and the resistance when the pipe 1 is inserted into the joint body 5 is large. Therefore, it is more preferable that the annular wall 40 is formed at the end face contact portion 4 a of the packing 4.

As a method for assembling the tube 1, in the above embodiment, the tube 1 was inserted into the joint body 5 with the packing 4 fitted on the end of the tube 1. The present invention is not limited to this, and a method of inserting the tube 1 into the joint body 5 after the packing 4 is inserted into the joint body 5 is also intended by the present invention.

[0036]

[Effect of the invention]

 As described above, according to the pipe joint structure of the present invention, the packing is pressed from the end faces of the two pipe bodies by the annular first pressing body provided on the inner peripheral surface of the thick part of the joint body. In addition, the packing is elastically displaced so as to expand and the inner circumference of the joint body is pressed by the second pressing body provided on the outer circumference of the end of both pipes from the outer circumference of the end. Leakage of the flowing fluid between the packing and the inner peripheral surface of the joint body, and leakage of the flowing fluid between the packing and the tubular body. It is completely prevented and a sufficient sealing effect of the packing can be obtained.

In addition, since the annular first pressing body is provided on the inner peripheral surface of the thick part of the joint body into which the opposite ends of the pair of pipes are inserted, the first pressing body and the joint body are separate bodies. Therefore, the cost is lower than when the first pressing body is formed integrally with the joint body.

Moreover, the first pressing body does not cause the inner peripheral surface of the joint body to directly contact the fluid flowing through the two pipes, so that rust does not occur on the inner peripheral surface.

Further, since the mounting portion of the tightening body is located at the thick portion of the joint body, the strength of the boundary between the thin portion and the thick portion of the joint body is increased by the end of the mounting portion of the tightening body. It can be reinforced, and sufficient strength can be ensured at the connection between the joint body and the pipe. Further, since the strength of the boundary portion between the thin portion and the thick portion of the joint body can be reinforced by the end of the mounting portion of the fastening body, the overall thickness of the joint body can be reduced.

[Brief description of the drawings]

FIG. 1 is a half sectional view of a joint structure of a tubular body showing one embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part of FIG.

3A is a front view of the annular ring of FIG. 1, and FIG. 3B is an enlarged sectional view of a part of FIG. 3A.

FIG. 4 is a sectional view of the packing of FIG. 1;

FIG. 5 is an enlarged sectional view of a main part of FIG.

FIG. 6 is an enlarged sectional view of a main part of a thick inner lining steel pipe.

FIG. 7 is a cross-sectional view of a packing for inner lining.

FIG. 8 is an enlarged sectional view of a main part of FIG. 7;

FIG. 9 is a half sectional view of a conventional joint structure for a tubular body.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Tube, 2 ... Ring, 3 ... Groove, 4 ... Packing, 4a ...
End surface contact portion, 4b: end outer peripheral surface contact portion, 5: joint body,
5a: thin portion, 5b: thick portion, 6: first pressing body, 7: second pressing body, 9: fastening body, 9a: mounting portion, 9b: pressing portion.

Claims (2)

[Utility model registration claims] 1. A screwing body (9) externally inserted into both ends of a pair of pipes (1) is screwed to both sides of a joint body (5) into which opposite ends of the pair of pipes (1) are inserted. Packing (4) provided between the both ends and the joint body (5).
An annular first pressing body (6) provided on an inner peripheral surface of a thick portion (5b) of the joint body (5), and the two pipes (1).
While being pressed by a cylindrical second pressing body (7) provided on the outer peripheral surface of the end, a ring (3) mounted in the groove (3) on the outer peripheral surface of both ends by the second pressing body (7). 2) The pipe joint is characterized in that the two pipes (1) are connected by pressing, and the ends of the two tightening bodies (9) are positioned at the thick part (5b). Construction. 2. A clamping body (9) and a cylindrical second pressing body (7) are extrapolated to opposing ends of a pair of pipes (1), and are inserted into grooves (3) on the peripheral surfaces of both ends. A ring (2) is attached, a packing (4) is externally fitted to the end face and the outer peripheral face of the both ends, and the both ends are inserted into the thin portions (5a) on both sides of the steel joint body (5). Then, an annular first pressing member (6) made of resin is press-fitted into a thick portion (5b) at the center of the joint body (5), and the packing (4) is inserted into the first pressing member (6). The end contact portion (4a) is brought into contact, and the cylindrical attachment portions (9a) of the both tightening bodies (9) are attached to the thin portions (5a) of the joint body (5).
And presses the annular pressing portion (9b) of the tightening body (9) against the second pressing body (7) to thereby press the second pressing body (7).
Is pressed against the ring (2), and the packing (4) is pressed against the two pressing bodies (6) and (7) to connect the two pipes (1). A joint structure for a tubular body, wherein an end portion is located at the thick portion (5b).