JP2001208261A - Pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe joint surely performing the sealing. SOLUTION: This pipe joint is provided with a joint body 2 formed of a single member having mating parts 3 in the both ends respectively or formed by connecting a plurality of members having the mating parts 3 in the both ends respectively, a sealing material 4 provided inside the joint body 2, a fastening device 5 for drawing the mating parts 3, 3 of the joint body 2 close together, and a prevention means preventing the sealing member 4 receiving a compression force by drawing the mating parts 3, 3 close together by the fastening device 5 from projecting out from the mating parts 3, 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint for connecting two pipes in a state where the ends of the pipes face each other.

[0002]

2. Description of the Related Art FIG.
(A) and (b) are shown. This is because the joint body 20 is configured so that one thin plate-like body can be curved in an arc shape so as to cover the outer surface of the connection portion between the one ends of the two tubes 6 and 6. The joint body 20 is provided with flat flange portions 20A, 20A protruding outward in the pipe diameter direction at both ends thereof and integrally formed. A packing sheet 21 is provided on the inner surface of the joint body 20 at the time of manufacturing or the like. Flange portions 2 at both ends of the joint body 20 that are attached and curved.
A bolt 22 and a nut 23 are provided as fasteners for pulling the 0A and 20A together. Accordingly, the flange portions 20A, 20A of the joint body 20 that are curved in an arc shape and cover the outer surfaces of the connection portions of the one ends of the pipes 6, 6 are provided.
The two pipes 6 and 6 (only one is shown in the figure) can be connected in a sealed state by pulling and tightening with a bolt 22 and a nut 23 (FIG. 1 of the present invention). reference).

When the pipe joint having the above structure is tightened, the packing sheet 21 located between the flange portions is elastically deformed by receiving a compressive force, and as shown in FIG. 10 (b), the packing sheet 21 is elastically deformed. Since the portion 21A escapes outward from between the flange portions 20A, 20A, sealing between the flange portions 20A, 20A cannot be reliably performed, and there has been a problem of inferior sealing.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above situation, and has as its object to provide a pipe joint which can reliably perform sealing.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the pipe joint of the present invention is intended to cover the outer surfaces of two ends of the two pipes with the ends thereof abutting each other.
A joint body composed of a single member provided with mating portions at both ends or a plurality of members connected with mating portions at both ends, a seal member provided on an inner surface of the joint body, and the joint body A fastener for pulling together the mating portions of the sealing member, and a blocking means for preventing the sealing material subjected to the compressive force from coming out of the mating portion by drawing the mating portions together with the fastener. Provided. By providing the blocking means as described above, it is possible to cause the sealing material to properly perform the sealing action between the mating portions of the joint main body, and it is possible to avoid the occurrence of poor sealing.

[0006] Each of the mating portions is formed by a flange protruding outward in the pipe diameter direction from the joint body, two side parts surrounding both ends in the pipe axis center of a sealing material provided on an inner surface of the flange part, and both side parts. Auxiliary sealing material having a hardness higher than the hardness of the sealing material is disposed between the sealing materials provided in the joining portions, each of which is composed of four members of a connecting portion that connects the outer ends of the pipes in the radial direction. are doing. By arranging the auxiliary sealing material that is less likely to deform as compared to the sealing material between the sealing materials as described above, a part of the sealing material that deforms first may be closed when the fittings are pulled together by the fastener. It can be prevented by the auxiliary sealing material from protruding from the gap between the mating portions.

By integrating the auxiliary sealing material on the surface of one of the sealing materials, not only can the operation of attaching the separately formed auxiliary sealing material be unnecessary, but also the positioning and the like at the time of application can be made. Become useless.

[0008] Each of the joining portions is constituted by a flange portion projecting outward from the joint body in the pipe radial direction,
A contact portion that contacts the outer surface of one of the flange portions in a state where the two flange portions are combined, and extends from both ends in the tube axis direction of the contact portion and is located on the inner surface side of the flange portion. A cover body consisting of four members, that is, both sides surrounding both ends of the sealing material in the pipe axis direction and a connecting portion connecting the outer ends in the pipe radial direction of the both sides, is attached to the two flanges to prevent the blocking. By configuring the means,
Even though the conventional joint is used, it is possible to reliably prevent the seal member from protruding from the cover body. In addition, since the gap between the two flange portions is covered by the cover body before the tightening, the sealing member has a smaller size than the closed state in which the gap between the mating portions is eliminated during the tightening. Extrusion can be reliably prevented, and the degree of tightening can be freely changed.

[0009] The one mating portion includes a flange protruding outward from the joint main body in the pipe radial direction, two side portions surrounding both ends of the seal member provided on the inner surface of the flange portion in the pipe axis center direction, and both sides thereof. The four ends of the connecting portion connecting the outer ends of the pipes in the radial direction of the pipe, and the other mating part is composed of a flange projecting outward from the joint body in the radial direction of the pipe, and By making it so that it can be inserted into one of the joints, it is possible to reliably prevent the sealing material from protruding, as compared with a structure in which the gap between the joints is closed during tightening as in claim 2. And the degree of tightening can be freely changed. Further, as compared with the case of the fourth aspect, not only can the number of members be reduced, but also the work of attaching the cover body can be made unnecessary.

[0010]

1 and 2 show a pipe joint 1 according to the present invention. The pipe joint 1 is a joint main body 2 formed by bending a single thin flat plate-like body shown by a two-dot chain line (only the right half is shown due to the space of the paper) in FIG.
And mating portions 3, 3 provided at both ends of the joint main body 2,
The joint body 2 and the sealing material 4 (the flat plate shown by a two-dot chain line in the figure, which is curved in an arc shape) adhered to the inner surfaces of the joining portions 3 and 3 were brought closer to each other by the bending. It comprises a bolt 8 for pulling the mating portions 3 and 3 and a fastener 5 comprising a nut 9 (other than these configurations). Therefore, after laying the joint main body 2 provided with the sealing material 4 in a state where the substantially central portion thereof is located on the lower surfaces of the two tubes 6 and 6 whose one ends abut each other in the tube axis direction, as described above. The outer surfaces of the two tubes 6, 6 are covered at one end by bending them into an arc shape, and then the joined portions 3, 3 which are close to each other are tightened by the fasteners 5 to seal the two tubes. It is possible to connect in a state where it has been done. Here, the joint main body 2 is shown as being composed of a single member, but as shown in FIG. 9A, two half-shaped members 1 each having mating portions 3 at both ends are provided.
1 and 12 (these two may be made of the same material or may be made of different materials). Alternatively, as shown in FIG. Fitting part 3,
Four members 13, 14, 15, 16 each having 3
(These four members may be constituted by the same member or different members), and the components of the joint body 2 may be determined according to the thickness of the pipe or the place where the joint is used. Can be changed. The other configurations shown in FIGS. 9A and 9B are the same as those in FIG. 2, and therefore are denoted by the same reference numerals and description thereof is omitted. 9 (a),
In (b), the sealing material 4 is omitted.

As shown in FIG. 1, the tube 6 has concave portions 6A and convex portions 6B (rectangular, but may be semicircular, circular, or triangular in the figure) on its outer surface.
And they are formed in a spiral shape. As the tube 6, in addition to the helically configured tube as described above,
A and the convex portion 6B may be configured in a ring shape. Further, it may be constituted by a straight tube without the convex portion 6B.

The sealing member 4 is made of rubber or a foam of rubber or a plastic foam such as foamed polyethylene, and is formed in a flat sheet shape (see a two-dot chain line in FIG. 2). If the sealing material 4 is provided in the joint body 2 before the pipe connection operation, for example, in the process of manufacturing the pipe joint 1, there is an advantage that the pipe connection operation can be performed quickly by that much. You may make it provide in the joint main body 2 at the time of a pipe connection. The bonding between the sealing member 4 and the joint body 2 may be performed by heat fusion or the like, instead of using an adhesive. The sealing member 4 is pressed against the surface of the convex portion 6B of the tube 6 to stop water between the convex portions. However, the convex portion 6B is provided at two specific portions of the concave portion 6A of the tube.
Filling the caulking material K (see FIG. 1) so that it rises slightly, and pressing the sealing material 4 on the upper surface thereof so as to stop the water between the concave portions. Providing a convex portion and a concave portion that enter the concave portion 5A and the convex portion 5B, respectively, has an advantage that the caulking material can be made unnecessary.

The joint body 2 is made of a single flat and thin synthetic resin plate (see a two-dot chain line in FIG. 2), and the joining portions 3 are integrally formed at both ends of the synthetic resin plate. Although it is advantageous in terms of manufacturing, it can also be formed using other materials such as metal. The joint body 2 includes:
By making it thin, it can be used in a curved shape when connected, and it can be configured as a flat plate when not in use, so it can be transported or stored as a flat plate while reducing the weight Although this is advantageous in terms of handling, the joint body 2 may be formed in a curved arc shape from the beginning. In this case, the thickness is slightly increased in order to ensure shape retention. 2A shown in FIG. 2 are a plurality of protrusions formed on the inner surface of the joint main body 2 so as to protrude in the pipe axis direction. When these protrusions 2A enter the recesses 6B of the pipe 6, the pipe joint 1 moves in the pipe axis direction. Although it is configured to act as a stopper so that it is not accidentally moved, it is not always necessary.

Since the joining portions 3 and 3 have the same configuration, only one joining portion 3 will be described. That is,
As shown in FIGS. 2 and 3 (a), (b), and (c), a flat flange portion 3A protruding outward in the pipe diameter direction at the end of the joint body 2, and the flange portion 3A A flat plate-shaped side portion 3B, 3C surrounding both ends in the tube axis direction of the sealing material 4 provided on the inner surface of the seal member 4 and a flat plate-shaped connection portion 3D connecting the pipe radial outer ends of the both side portions 3B, 3C. It is configured so as to surround the outer peripheral edge of the sealing material 4 from the four members, and when the fitting portions 3 and 3 are drawn by the fastener 5,
A part of the sealing material 4 that protrudes outside from the mating parts 3, 3 constitutes a blocking means that can be prevented from coming into contact with the inner surfaces of the side parts 3B, 3C and the connecting part 3D. 3a, 3a shown in the figure are through holes for the bolts 8, 8 formed at two places on the flange 3A.

As shown in FIGS. 2 and 3 (a), (b) and (c), the sealing material 4 is, for example, 15 ° to 40 °.
Between the two sealing members 4, 4 provided in the mating portions 3, 3, for example, 50 ° to 80 °.
By arranging the flat rectangular auxiliary seal member 7 having a hardness of 3 mm, a part of the seal members 4, 4 elastically deformed during the pulling of the joint portions 3, 3
3 so that it does not protrude outside.
In this case, it is preferable that the hardness is such that the auxiliary sealing material 7 is not deformed while the joining portions 3 and 3 are being drawn. The hardness may be such that it is slightly deformed so as not to protrude outside. The inner surface 4A of the sealing material 4 and the mating surface 3E of the mating portion 3 are set to be flush with each other.
May be set at a position closer to the flange portion 3A side than the mating surface 3E of the mating portion 3. If the auxiliary sealing material 7 is previously provided on the inner surface of one of the sealing materials 4 by an adhesive or heat fusion, there is an advantage that the pipe connection operation can be performed quickly. In addition, if the bolts 8 through holes 4a, 7a are formed in the seal members 4, 4 and the auxiliary seal member 7,
The work can be speeded up as compared with the case where a through hole is formed at the time of connection.

When the two pipes 6 and 6 are connected by the pipe joint 1, as described above, the two pipes 6 and 6 (shown in FIG. After filling at two predetermined locations on the outer surface of the end of the pipe, the joint body 2 is positioned on the lower surface of one end of each of the pipes 6 and 6 to be connected.
By bending the joint main body 2 in an arc shape, the pipe joint 1 is covered on the outer surfaces of the ends of the two pipes 6, 6 (not shown) (see FIG. 3A). Thereafter, as shown in FIG. 3B, the auxiliary sealing material 7 is arranged between the joining portions 3 and 3, and the bolt 8 is passed through the joining portions 3 and 3 with the auxiliary sealing material 7 interposed therebetween, and then the nut is By connecting the two pipes 6 and 6 (not shown) by screwing to the pipe 9 (see FIG. 3C). In addition, FIG.
The tubes 6 are omitted in (b) and (c). Although the case where the fitting portions 3 and 3 are located immediately above the tube 6 is shown, the position of the fitting portions 3 and 3 with respect to the tube 6 can be freely changed.

Although the auxiliary sealing material 7 is formed to have the same thickness at any part, as shown in FIG. 4A, the auxiliary sealing material 7 may be formed to have a cross-sectional trapezoidal shape that becomes thicker toward the tube side. As shown in FIG. 4 (b), the cross section may be formed in a substantially flask shape with a thickness increasing from the substantially middle portion to the tube side in the tube diameter direction toward the tube side. By configuring as shown in FIGS. 4 (a) and 4 (b), the amount of deformation of the sealing material 4 is increased toward the pipe side, and while the sealing process is ensured, a part of the sealing materials 4 and 4 are aligned. There is an advantage that it is possible to reliably prevent the spilling out of the space between the parts 3 and 3.

Each of the joining portions 3 and 3 may be configured as shown in FIGS. That is, the joint body 2
A flange portion 3A protruding outward in the pipe diameter direction from the outside, and abuts on the outer surface of one flange portion 3A in a state where the two flange portions 3A, 3A are put together, and the bolts 8, 8 A contact portion 10A in which the through holes 10a are formed, and a tube core direction of the sealing material 4 extending from both ends of the contact portion 10A in the tube axis direction and located on the inner surface side of the flange portion 10A. Both sides 10B surrounding both ends,
10C and a cover body 10 composed of four members of a connecting portion 10D connecting the outer ends in the pipe diameter direction of both side portions 10B, 10C to the two flange portions 3A, 3A to constitute the blocking means. are doing. In this case, before the bolt 8 is tightened, the two flange portions 3
3A, 3A because the space between A and 3A is covered.
As shown in (b) and (c), the auxiliary sealing material 7 which is necessary in the case of the structure in which the gaps between the mating surfaces 3E and 3E of the mating portions 3 and 3E during the tightening are eliminated so as to be eliminated is unnecessary. But the matching part 3,
There is an advantage that the protrusion of the sealing material 4 from the portion 3 can be reliably prevented and the degree of tightening can be freely changed. The other components not described in FIGS. 5 and 6 are the same as those in FIG. 2, and thus are denoted by the same reference numerals and description thereof is omitted.

Further, the joining portions 3 and 3 are connected to each other as shown in FIGS.
May be configured as shown in FIG. That is, one of the mating portions 3 is formed by a flange portion 3A protruding outward from the joint body 2 in the pipe diameter direction, and both side portions 3B surrounding both ends in the pipe axis direction of the sealing material 4 provided on the inner surface of the flange portion 3A. , 3C
And four connecting members 3D for connecting the outer ends of these two side portions 3B and 3C in the radial direction of the tube, and the other mating portion 3 projects outward from the joint body 2 in the radial direction of the tube. As shown in FIGS. 3 (a), 3 (b) and 3 (c), the flange portion 3A is formed so that it can enter the one mating portion 3A. The sealing material from the mating portions 3 and 3 can be made unnecessary, although the auxiliary sealing material 7 required in the case of the structure in which the gaps between the mating surfaces 3E and 3E of the mating surfaces 3E and 3E are moved away from each other can be made unnecessary. There is an advantage that the protrusion of No. 4 can be reliably prevented and the degree of tightening can be freely changed. 5 and 6
The number of members can be reduced as compared with the case where the cover body 10 is provided as shown in FIG.
There is an advantage that the operation of attaching the helmet can be made unnecessary. Other configurations not described in FIGS. 5 and 6 are:
Since it is the same as that of FIG.
Description is omitted. Although FIGS. 6 and 8 show the case where the sealing material 4 is provided on each of the inner surfaces of the flange portions 3A, 3A, the sealing material 4 on the inner surface of one of the flange portions 3A is omitted. You can also.

[0020]

According to the first aspect of the present invention, the sealing member is provided by preventing the sealing material, which has been subjected to the compressive force by pulling the mating portions together with the fastening tool, out of the mating portion. A pipe joint can be provided in which a material can be properly sealed between mating portions of a joint main body, and a sealing failure can be avoided.

According to the second aspect, each of the joining portions is
Consisting of four members for covering the outer peripheral edge of the sealing material,
By arranging an auxiliary sealing material with high hardness that is less likely to be deformed than the hardness of the sealing material between the sealing materials provided in each of the fitting parts, it deforms first when the fitting parts are pulled together by the fastener. The auxiliary sealing material can reliably prevent the part of the sealing material to be protruded from the gap between the mating portions to be closed.

According to the third aspect, by integrating the auxiliary sealing material on the surface of one of the sealing materials, not only can the operation of attaching the separately formed auxiliary sealing material be unnecessary, but also the attaching operation can be performed. Positioning or the like at the time becomes unnecessary, and the connection work can be sped up.

According to the fourth aspect, each of the joining portions is a cover member composed of four members for covering the outer peripheral edge of the sealing material, and the cover members are attached to the two flange portions to constitute the blocking means. By doing so, it is possible to reliably prevent the seal member from being protruded by the cover body while using the conventional joint. In addition, since the gap between the two flange portions is covered by the cover body before the tightening, the sealing member has a smaller size than the closed state in which the gap between the mating portions is eliminated during the tightening. Extrusion can be reliably prevented, and the degree of tightening can be freely changed, which is advantageous in both the sealing surface and the use surface.

According to the fifth aspect, one of the mating portions is composed of four members for covering the outer peripheral edge of the sealing material, and the other mating portion projects outward from the joint body in the pipe radial direction. The seal member is made of a flange portion and is configured to be able to enter one of the joining portions so that the gap between the joining portions is eliminated during tightening. The protrusion can be reliably prevented, and the degree of tightening can be freely changed, which is advantageous in both the sealing surface and the use surface as in the fourth aspect. Further, as compared with the case of claim 4, not only can the number of members be reduced,
The work of attaching the cover body can be made unnecessary, which is advantageous in terms of cost and connection work.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a state where two pipes are connected by a pipe joint.

FIG. 2 is an exploded perspective view of a pipe joint.

FIG. 3 is a sectional view of a fitting portion of the pipe joint,
(A) shows a state in which the joining portion is brought closer, and (b)
Shows a state immediately before the bolt and the nut are attached to the joint, and (c) shows a state where the joint is tightened by the bolt and the nut.

FIGS. 4A and 4B are cross-sectional views showing other shapes of the auxiliary sealing material.

FIG. 5 is an exploded perspective view showing a mating portion of another configuration of the pipe joint.

FIG. 6 is a cross-sectional view showing a state where a fitting portion of the pipe joint of FIG. 5 is tightened.

FIG. 7 is an exploded perspective view showing a mating portion of another configuration of the pipe joint.

FIG. 8 is a cross-sectional view showing a state where a fitting portion of the pipe joint of FIG. 7 is tightened.

FIG. 9 is a front view showing the configuration of another pipe joint, and FIG.
Indicates a member composed of two members, and (b) indicates a member composed of four members.

FIG. 10 is a front view showing a conventional example of a pipe joint, and FIG.
Indicates a state immediately before fastening with a fastener, and (b)
Shows the state after fastening with the fastener.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fitting 2 Fitting body 2A Projection 3 Fitting part 3A Flange part 3B, 3C Both sides 3D Connecting part 3E Fitting surface 4 Seal material 4A Inner surface 4a Through hole 5 Fastening tool 6 Pipe 6A Concave part 6B Convex part 7 Auxiliary seal material 7a Penetration Hole 8 Bolt 9 Nut 10 Cover body 10A Contact part 10B, 10C Both sides 10D Connecting part 10a Through hole 11-16 Member 20 Joint body 20A Flange 21 Packing sheet 21A Part 22 Bolt 23 Nut K Caulking material

Claims (5)

[Claims] 1. A single member having mating portions at both ends or a mating portion at both ends for covering the outer surfaces of both ends with the ends of the two tubes abutting each other. A joint body formed by connecting a plurality of members provided respectively, and a sealing material provided on an inner surface of the joint body,
A fastener for pulling together the mating portions of the joint body, and preventing the sealing material subjected to the compressive force from protruding from the mating portion by drawing the mating portions together with the fastener. A pipe joint, comprising a blocking means. 2. A flange part projecting outward from the joint main body in the pipe diameter direction, two side parts surrounding both ends of a sealing material provided on an inner surface of the flange part in a pipe axis direction, and Auxiliary sealing material having a hardness higher than the hardness of the sealing material between the sealing materials provided in the joining portions, each of which is composed of four members of a connecting portion connecting the radially outer ends of the pipes on both sides. The pipe joint according to claim 1, wherein 3. The pipe joint according to claim 2, wherein said auxiliary sealing material is integrated with a surface of one of said sealing materials. 4. Each of the joining portions is constituted by a flange portion projecting outward in the pipe diameter direction from the joint body, and abuts on an outer surface of one of the flange portions in a state where the two flange portions are joined. Contacting portions, two side portions extending from both ends in the tube axis direction of the contact portion and surrounding both ends in the tube axis direction of the sealing material located on the inner surface side of the flange portion, and tubes on these both side portions. 2. The blocking means comprising a cover body comprising four members of a connecting portion connecting radially outer end portions to the two flange portions.
The described pipe fitting. 5. A flange part projecting outward from the joint main body in the pipe radial direction, one side part surrounding both ends of a sealing material provided on an inner surface of the flange part in a pipe axis direction, and These two side portions are formed of four members of a connecting portion that connects the outer ends of the tubes in the radial direction, and the other mating portion is formed of a flange portion projecting outward in the radial direction of the tube from the joint body, and 2. The pipe joint according to claim 1, wherein said pipe joint is configured so as to be able to enter said one mating portion.