JP2007146977A - Structure and device for joining pipe body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joining structure and a joining device capable of easily connecting pipe bodies forming recessed parts and projecting parts spirally on their outer peripheral faces mutually and tightening them through a seal member without causing the seal member to misalign easily even if high internal pressure acts on the pipe body and without applying any machining to an end part of the pipe body. <P>SOLUTION: This joining structure is provided with the seal member attached over both of outer peripheral faces of the end parts of the first and second pipe bodies facing mutually and a tightening means for tightening the seal member on the outer peripheral face of the end part of each pipe body by forming projecting parts and recessed parts engaging with the recessed parts and the projecting parts on the outer peripheral face of the end part of each pipe body on an inner peripheral face of the seal member spirally in the same manner. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a pipe joint structure and a joint device that maintain sufficient sealing performance.

  As this type of joint structure, for example, a sheet-like seal member is wound at least once around adjacent hose ends, and then the connecting members are tightened from the outer side to connect the hoses together. When the hose outer surface is uneven, since the sealing member makes point contact with the top of the upper part of the convex part, the sealing function cannot be sufficiently exhibited. A structure has been proposed in which the entire connecting portion is covered with a sheet-like sealing member after being injected and flattened, and connected by being tightened from the outside by the connecting member (see, for example, Patent Document 1). ).

However, in the structure in which such a flat end outer peripheral surface is simply tightened with a connecting member via a seal member, the hose extends particularly when pressure is applied to the inside of the hose, and the hose extends against the inner surface of the seal member. There is a problem that the gaps occur in the directions away from each other and the connection between the hoses is disconnected.
In addition, in order to make the outer surface of the uneven hose flat as described above, cost and labor are required, and a joint structure with lower cost and good workability has been demanded.

JP-A-11-229474

  Therefore, in view of the above-described situation, the present invention intends to solve the problem in the joint structure in which the tubular bodies in which the concave portions and the convex portions are spirally formed on the outer peripheral surface are tightened via the sheet member. The present invention is to provide a joint structure and a joint device that can be easily connected without causing any slippage of the seal member even when a high internal pressure is applied, and without processing the end of the pipe body.

  In order to solve the above-mentioned problems, the present invention provides a joint structure in which a first tubular body and a second tubular body, in which concave portions and convex portions are formed in a spiral shape on the outer peripheral surface, are connected to each other at end portions. A seal member that is attached over both outer peripheral surfaces of the first tube end and the second tube end facing each other, and an outer peripheral surface of each tube end on the inner peripheral surface of the seal member The convex portion and the concave portion that engage with the concave portion and the convex portion are similarly formed in a spiral shape, and a fastening means for fastening the seal member to the outer peripheral surface of each tubular body end portion is provided, and by fastening the fastening means, The tubular joint structure is characterized in that the convex portion and the concave portion are pressure-engaged with the concave portion and the convex portion on the outer peripheral surface of the tubular body end portion.

  Moreover, this invention is a coupling apparatus which connects the 1st tube body and the 2nd tube body by which the recessed part and the convex part were helically formed in the outer peripheral surface at end parts, Comprising: Convex portions that are attached to both the outer peripheral surfaces of the tubular body end portion and the second tubular body end portion, and engage with the concave and convex portions of the outer peripheral surface of each tubular body end on the inner peripheral surface of the seal member And a sealing member having a concave portion formed in a spiral shape, and fastening means for fastening the sealing member to the outer peripheral surface of each tubular body end, and the convex portion by fastening the fastening means Also provided is a joint device characterized in that the concave portion is press-fitted into the concave portion and the convex portion on the outer peripheral surface of the tube body end portion.

  Here, it is preferable that the tightening means includes a metal plate that contacts the outer peripheral surface of the seal member and a diameter reducing means for reducing the diameter of the metal plate.

  Moreover, it is preferable to provide the uneven | corrugated | grooved part which carries out uneven | corrugated engagement along a longitudinal direction in the said metal plate inner peripheral surface and a sealing member outer peripheral surface, respectively.

  According to the pipe joint structure and the joint device according to the present invention as described above, the convex portion and the concave portion that are engaged with the concave portion and the convex portion of the outer peripheral surface of each tubular body are similarly provided on the inner peripheral surface of the seal member. Since it is formed in a spiral shape, even if a force that causes the pipes to move away from each other due to internal pressure is applied, the seal member and the outer peripheral surface of each pipe end are not spot-bonded to the convex part of the pipe. Since it is integrated by friction engagement firmly by uneven engagement, it is possible to reliably prevent displacement between the seal member and the tube body, and to improve workability without processing the tube end portion flat, It can be easily connected and the cost can be reduced.

  In addition, the fastening means is composed of a metal plate that abuts the outer peripheral surface of the seal member and a diameter reducing means for reducing the diameter of the metal plate, so that the seal member can be uniformly pressed against each tubular body and is stable. The sealing performance can be maintained.

  Moreover, since the concave and convex portions that engage with the concave and convex portions along the longitudinal direction are provided on the inner peripheral surface of the metal plate and the outer peripheral surface of the seal member, respectively, the integrated state in which the seal member is engaged with the metal plate can be maintained. As a result, there is a disadvantage that the seal member is pulled by one of the pipes and is removed from the fastening means together with the pipe, and a problem that the pipes are pulled and extended by both pipes and the pipe is disconnected. It can be prevented beforehand.

  Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  1 and 2 are explanatory views showing a joint structure according to the present invention. FIGS. 1 and 2 show a first embodiment, FIGS. 3 and 4 show a second embodiment, and in FIG. Indicates a joint device, 2 indicates a seal member, and 3 indicates a fastening means.

  In the joint structure S of the present invention, the first tubular body 8 and the second tubular body 9 in which the concave portion 83 (93) and the convex portion 82 (92) are formed in a spiral shape on the outer peripheral surface are connected to each other at the end portions. The seal member 2 is provided to be applied over both the outer peripheral surfaces 81 and 91 of the first tube end portion 80 and the second tube end portion 90 facing each other. On the inner peripheral surface 20, convex portions 41 and concave portions 42 that engage with the concave portions 83 (93) and the convex portions 82 (92) on the outer peripheral surface of each tube body are formed in the same spiral shape. Fastening means 3 for fastening to the outer peripheral surface of the tube end portion is provided, and by the fastening of the tightening means 3, the convex portion 41 and the concave portion 42 become the concave portion 83 (93) and convex portion of the outer peripheral surface of the pipe end portion 82 (92) is pressure-engaged.

  That is, the joint device 1 according to the present invention is attached to both the outer peripheral surfaces 81 and 91 of the first tube end portion 80 and the second tube end portion 90 facing each other, and the inner periphery of the seal member 2. A seal member 2 in which a convex portion 41 and a concave portion 42 that are engaged with the concave portion 83 (93) and the convex portion 82 (92) on the outer peripheral surface of each tubular body end are formed on the surface 20 in the same spiral shape, and the seal And fastening means 3 for fastening the member 2 to the outer peripheral surfaces 81 and 91 of the respective tube end portions.

  In this example, the tubular bodies 8 and 9 are examples of a resin composite hose in which a hard resin core is spirally embedded in a soft resin main body, but the present invention is such a composite hose. However, the present invention is not limited to this, and can be used for connecting a resin hose other than a composite hose or a metal pipe as long as the concave and convex portions are formed in a spiral shape on the outer peripheral surface.

  The seal member 2 is hermetically sealed so that fluid does not leak from the connection portion between the end portions of the hose, and can be composed of a rubber material, an elastic foam, a soft synthetic resin, or the like. In this example, the convex portion 41 and the concave portion 42 are formed in a spiral shape at the same pitch so as to engage with the concave portion 83 (93) and the convex portion 82 (92), so that the internal pressure acts as well as the sealing function. In this case, the tubular bodies 8 and 9 have a function of preventing the tubular bodies 8 and 9 from coming off.

  In this example, the convex portion 41 and the concave portion 42 are set so that the height of the convex portion 41 is higher than the depth of the concave portion 83 (93) of the tubular body so that the convex portion 41 and the concave portion 42 are in close contact with each other. In order to maintain the depth, the depth is set to the same level as the height of the convex portion 82 (92) of the tubular body. A shape that can be locked at least, or formed in a large size to improve adhesion, is also a preferred embodiment. As in this example of the cross-sectional shape, a quadrangular shape and other irregularities other than corrugations are continuous. You may form in a shape.

  The sealing member 2 may be formed into a cylindrical shape at the time of manufacture, or may be formed into a half-shaped shape and assembled, or a single sheet having concave and convex grooves constituting the convex portions 41 and the concave portions 42 on the inner surface side. What is formed into a sheet shape may be deformed into a cylindrical shape at the time of use and attached to the end of each tubular body, or may be deformed into a cylindrical shape and bonded to form a tubular body.

  When mounting a tubular structure between the tube ends, attach it to the outer peripheral surface of one tube end while rotating it, and then attach it to the outer peripheral surface of the other tube end while returning. By doing so, it can be easily mounted in a state where the tube ends face each other.

  The tightening means 3 is composed of a metal plate 6 that contacts the outer peripheral surface 21 of the seal member 2 and a diameter reducing means 7 for reducing the diameter of the metal plate 6. The sealing member 2 can be uniformly pressed against each tubular body and can be maintained in a stable airtight state.

The metal plate 6 is a thin plate made of stainless steel or the like, and is a metal that is fastened by tightening a screw as a diameter reducing means 7 for reducing the diameter of the metal plate 6 by two on one side at a position corresponding to the outer peripheral surface of each tubular body. A flat band made of metal is attached.
The number of bands is not limited to two on each side, and can be attached one by one, or three or more.

  In addition, it is good also as a synthetic resin thin plate which can be bent instead of the metal plate 6, and it is also possible to use a wire band, a synthetic resin binding band, etc. other than a metal flat band.

  Further, in this example, a single metal plate 6 is wound, but a suitable one such as one formed into a cylindrical shape, or one in which a pair of members formed in a halved shape is fastened by being assembled into a cylindrical shape with screws. It is possible to employ the fastening means 3.

  3 and 4 show a second embodiment of the present invention, in which concave and convex portions 61 and 22 are provided on the inner peripheral surface 60 of the metal plate and the outer peripheral surface 21 of the seal member to engage with the concave and convex portions along the longitudinal direction. .

  As a result, even when pressure is applied between the connected pipe bodies, the seal member 2 is engaged with the metal plate 6 and maintained in an integrated state, and is pulled by one of the pipe bodies 8 and 9. It is possible to prevent inconveniences such as disconnection or stretching by being pulled by both pipes, and disconnection of the pipes, so that a more reliable connection state can be realized.

  In this example, two uneven portions 61 and 22 are provided on one side, and a metal flat band is arranged between the two, but the number of uneven portions is not limited to this, and in this example, Although formed in a ring shape, it may be formed in a spiral shape.

  Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and can of course be implemented in various forms without departing from the gist of the present invention.

Explanatory drawing which shows the joint structure which concerns on 1st Embodiment of this invention. The longitudinal cross-sectional view which similarly shows a joint structure. Explanatory drawing which shows the joint structure which concerns on 2nd Embodiment of this invention. The longitudinal cross-sectional view which similarly shows a joint structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Joint apparatus 2 Seal member 3 Tightening means 6 Metal plate 7 Diameter reduction means 8, 9 Tubing body 20 Inner peripheral surface 21 Outer peripheral surface 22 Concavity and convexity 41 Convex portion 42 Concavity 60 Inner peripheral surface 61 Concavity and convexity portion 80 Tube end portion 81 Outer peripheral surface 82 Convex portion 83 Concave portion 90 End portion of tubular body 91 Outer peripheral surface S Joint structure

Claims (6)

It is a joint structure for connecting the first tube body and the second tube body, in which the concave portion and the convex portion are formed in a spiral shape on the outer peripheral surface, at the end portions,
A seal member is provided to be applied over both outer peripheral surfaces of the first tube end and the second tube end facing each other;
On the inner peripheral surface of the seal member, a convex portion and a concave portion that engage with the concave portion and the convex portion on the outer peripheral surface of each tubular body end are similarly formed in a spiral shape,
A fastening means for fastening the seal member to the outer peripheral surface of each tubular body end is provided,
A tubular joint structure in which the convex portion and the concave portion are press-fitted into the concave portion and the convex portion on the outer peripheral surface of the tubular body by fastening of the fastening means.   The pipe joint structure according to claim 1, wherein the tightening means comprises a metal plate in contact with the outer peripheral surface of the seal member and a diameter reducing means for reducing the diameter of the metal plate.   The connecting structure for a tubular body according to claim 2, wherein the metal plate inner peripheral surface and the seal member outer peripheral surface are provided with concave and convex portions that engage with each other along the longitudinal direction. A joint device for connecting the first tubular body and the second tubular body, each having a concave portion and a convex portion formed in a spiral shape on the outer peripheral surface, to each other at the ends,
It is applied to both the outer peripheral surfaces of the first tube end and the second tube end facing each other, and is formed on the inner peripheral surface of the seal member on the concave and convex portions on the outer peripheral surface of each tube end. A sealing member in which a convex part and a concave part to be engaged are also formed in a spiral shape;
Tightening means for fastening the seal member to the outer peripheral surface of each tube end;
And the convex portion and the concave portion are pressure-engaged with the concave portion and the convex portion on the outer peripheral surface of the tube body by fastening of the tightening means.   The joint device according to claim 4, wherein the tightening means includes a metal plate that contacts the outer peripheral surface of the seal member, and a diameter reducing means for reducing the diameter of the metal plate. The joint device according to claim 5, wherein the metal plate inner peripheral surface and the seal member outer peripheral surface are provided with concave and convex portions that engage with the concave and convex portions along the longitudinal direction.

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