JP2008261465A - Connection structure of pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide connection structure of pipes, which easily connects two pipes at low cost while restraining axial deviation of the two pipes. <P>SOLUTION: A seal member 20 is attached to one end side of a first pipe 10, the first pipe is inserted into a cylindrical pipe insertion part 23 in an axial deviation preventing tool 30, and the one end side of the first pipe and the pipe insertion part of the axial deviation preventing tool are inserted into a second pipe, and the connection structure JS is formed. An inner peripheral surface of the pipe insertion part of the axial deviation preventing tool is brought into contact with or adjacent to an outer peripheral surface of the first pipe, and an outer peripheral surface of the pipe insertion part of the axial deviation preventing tool is brought into contact with or adjacent to an inner peripheral surface of the second pipe. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a connection structure between pipes.

  When pipes are connected using pipe joints, it is often necessary to perform complicated processing on the material in order to produce a pipe joint of a desired shape, and the waste of the material is also relatively high, so the cost is high. Easily bulky. For this reason, connecting pipes without using a pipe joint is also performed.

  For example, Patent Document 1 describes a connection structure in which one end of a male metal pipe is inserted into one female metal pipe from one end of a female metal pipe, and these metal pipes are fixed by a connecting member. . At the one end of the female metal pipe, a large-diameter cylindrical portion for tightly fitting a sealing material is formed and a curled outer flange portion is formed. In addition, an outer flange portion is formed at one end of the metal pipe on the male side, and a ring body is fitted at a distance from the outer flange portion. A sealing material is fitted between them. The connecting member is formed with two long holes into which the curled outer flange portion formed in the female-side metal pipe is partially fitted. Each of the two long holes is formed in each of the two long holes. The female and male metal pipes are fixed by sandwiching the female and male metal pipes from the outside in the radial direction with the curled outer flange portion engaged.

  In the connection structure described in Patent Document 1 configured as described above, the outer flange portion formed on the male-side metal pipe and the ring body fitted on the metal pipe, the female-side It is understood that the axial displacement between the metal pipe and the male metal pipe is prevented.

JP 2004-316786 A

  However, in the connection structure specifically described in Patent Document 1, a groove is formed on the inner periphery of the ring body, and plastic working is performed on a predetermined portion of the male metal pipe to be inserted into the groove. In order to fit the ring body to the male side metal pipe by forming a small collar part to be performed, the manufacturing cost of the ring body and the manufacturing cost of the male side metal pipe to which the ring body is fitted are increased, As a result, the cost for forming the connection structure also increases.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to obtain a pipe connection structure that can easily connect the two pipes at low cost while suppressing the axial displacement of the two pipes.

  The pipe connection structure of the present invention that achieves the above-described object includes a first pipe having a seal member attached to one end thereof, and an axial misalignment prevention having a cylindrical pipe insertion portion through which the first pipe is passed. And a second pipe into which the one end side of the first pipe and the pipe insertion part of the shaft misalignment prevention tool are inserted, and the inner peripheral surface of the pipe insertion part of the shaft misalignment prevention tool is the first pipe The outer peripheral surface of the pipe is in contact with or close to the outer peripheral surface, and the outer peripheral surface of the pipe insertion portion of the shaft misalignment prevention tool is in contact with or close to the inner peripheral surface of the second pipe.

  In the pipe connection structure of the present invention, the first pipe is passed through the pipe insertion portion of the shaft misalignment prevention tool, the inner peripheral surface of the pipe insertion portion is brought into contact with or close to the outer peripheral surface of the first pipe, and the pipe is inserted. Since the outer peripheral surface of the portion is in contact with or close to the inner peripheral surface of the second pipe, the position of each of the first pipe and the second pipe is regulated by the shaft misalignment prevention tool so that the axes of these pipes are offset. Easy to suppress. The above-described shaft misalignment prevention tool can be manufactured relatively easily by, for example, drawing. Therefore, according to the pipe connection structure of the present invention, it is easy to connect the two pipes at low cost while suppressing the axial displacement of the two pipes.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a pipe connection structure of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the embodiments described below.

  1 is a front view schematically showing an example of a pipe connection structure, FIG. 2 is a longitudinal sectional view schematically showing the connection structure shown in FIG. 1, and FIG. 3 is shown in FIG. It is the schematic of the end surface along line III-III. 4 is a side view schematically showing the shaft misalignment prevention device used in the connection structure shown in FIG. 1, and FIG. 5 schematically shows the shaft misalignment prevention device shown in FIG. It is a bottom view. FIG. 6 is a side view schematically showing the fixing member used in the connection structure shown in FIG.

  As shown in FIG. 1, the connection structure JS includes a first pipe 10, a shaft misalignment prevention tool 30, a second pipe 40, and a fixing member 50. In the connection structure JS, The positions of the first pipe 10, the shaft misalignment prevention tool 30, and the second pipe 40 are fixed by the member 50. The 1st piping 10 and the 2nd piping 40 are used as a flow path of water or hot water, for example.

  The first pipe 10 is a metal pipe made of, for example, copper, aluminum, stainless steel, steel or the like, and the first pipe 10 is formed at one end and protrudes outward as shown in FIG. The flange portion 5a and a second flange portion that is formed at an interval from the first flange portion 5b and projects outward. The first flange portion 5a and the second flange portion 5b are formed by plastic processing, for example. For example, a seal member 20 such as an O-ring is attached to the first pipe 10 between the first flange portion 5a and the second flange portion 5b.

  As shown in FIGS. 2, 4, and 5, the shaft misalignment prevention tool 30 is formed at the pipe insertion portion 23 through which the first pipe is passed and at one end of the pipe insertion portion 23 so as to protrude outward. First flange portion 25. The pipe insertion portion 23 has a hollow hexagonal column shape, that is, a shape obtained by rounding each corner on the outer periphery and inner periphery of the hollow hexagonal column, and the first positioning flange portion 25 has a circular contour shape. ing.

  The inner dimension of the pipe insertion part 23 is smaller than the outer dimension of the second flange part 5 b formed in the first pipe 10. In other words, the diameter (passing diameter) of the pipe insertion portion 23 is smaller than the diameter (outer diameter) of the second flange portion 5b. As shown in FIG. 2, the first pipe 10 is passed through the pipe insertion portion 23 in a direction in which the second flange portion 5 b and the other end of the pipe insertion portion 23 come into contact with each other. For this reason, the relative movement range of the first pipe 10 is regulated by the second flange portion 5 b coming into contact with the other end of the pipe insertion portion 23. The second flange portion 5 b functions as a stopper that relatively restricts the range of movement between the first pipe 10 and the shaft misalignment prevention tool 30, and is a seal member caused by contact between the pipe insertion portion 23 and the seal member 20. 20 damage is prevented.

  The second pipe 40 is a metal pipe made of copper, aluminum, stainless steel, steel or the like, similar to the first pipe 10, and at one end side of the second pipe 40, as shown in FIG. A large-diameter portion 33 is formed. On the open end side of the large-diameter portion 33, a positioning second flange portion 35 that is formed in a curl shape and projects outward is formed by plastic working. The one end side of the first pipe 10 and the pipe insertion part 23 of the shaft misalignment prevention tool 30 are inserted into the large diameter part 33 from the positioning second flange part 35 side. As shown in FIG. 3, in the connection structure JS, the inner peripheral surface of the pipe insertion portion 23 contacts the outer peripheral surface of the first pipe 10, and the outer peripheral surface of the pipe insertion portion 23 is the inner peripheral surface of the second pipe 40. Touching.

  As shown in FIG. 2 or 3, the fixing member 50 includes the first pipe 10, the first flange portion 25 for positioning the shaft misalignment prevention device 30, and the second flange portion 35 for positioning the second pipe 40. The positions of the first pipe 10, the shaft misalignment prevention tool 30, and the second pipe 40 are fixed by engaging with the outer peripheral surface of the second pipe 40. As shown in FIG. 2, FIG. 3, or FIG. 6, the fixing member 50 has two arm portions 45 a and 45 b that are arranged at a distance from each other and generate elastic force when the distance is expanded. Each of the arm portions 45a and 45b is divided into one end and the other end of the spacer portion 47 (see FIG. 3), and is arranged in the first pipe 10, the shaft misalignment prevention device 30, and the second. Each of the pipes is sandwiched from both sides in the radial direction.

  The arm portions 45a and 45b are engaged with the positioning first flange portion 25 of the shaft misalignment prevention tool 30 and the positioning second flange portion 35 of the second pipe 40, and the positioning first flange. The engagement portion for fixing the shaft misalignment prevention tool 30 to the second pipe 40, specifically, a long hole 41 (see FIG. 2) is formed by bringing the portion 25 and the second positioning flange portion 35 into close contact with each other. Has been. The length of each elongated hole 41 (the length in front view) is larger than the outer dimensions of the first positioning flange portion 25 and the second positioning flange portion 35, respectively. Each of the second flange portions 35 is partially inserted into each of the long holes 41 and is in close contact with each other. Further, each of the arm portions 45 a and 45 b has a first arcuate portion 42 that is partially pressed against the outer peripheral surface of the first pipe 10 and a second arc that is partially pressed against the outer peripheral surface of the second pipe 40. An arcuate portion 43 (see FIG. 2, FIG. 3, or FIG. 6) is also formed.

  In the connection structure JS having the above-described configuration, the first pipe 10 is passed through the pipe insertion portion 23 of the shaft misalignment prevention tool 30, and the inner peripheral surface of the pipe insertion portion 23 is connected to the outer peripheral surface of the first pipe 10. Since the outer peripheral surface is brought into contact with the inner peripheral surface of the second pipe, the positions of the first pipe 10 and the second pipe 40 are regulated by the shaft misalignment prevention tool 30, and the pipes 10, 40 are controlled. It is easy to suppress the axis deviation.

  Further, the first flange portion 25 for positioning of the shaft misalignment prevention tool 30 and the second flange portion 35 for positioning of the second pipe 40 are inserted into the long holes 41 of the arm portions 45a and 45b, and these flange portions 25 are inserted. , 35 are brought into close contact with each other, so that the shaft misalignment preventing member 30 can be fixed to the second pipe 40. And since the 1st arcuate part 42 in each arm part 45a, 45b is partially press-contacted to the outer peripheral surface of the 1st piping 10, between the 1st piping 10, an axial deviation prevention tool, and the 2nd piping 40 The positional relationship can be defined. The first pipe 10 can move to some extent in the pipe axis direction, but the moving range is the distance between the second flange portion 5b and the shaft misalignment prevention tool 30, and the large diameter portion of the second pipe 40. It is controllable by 33 length.

  As described above, according to the connection structure JS, it is easy to connect the first pipe 10 and the second pipe 40 while suppressing the axial deviation. Further, the shaft misalignment prevention tool 30 can be relatively easily manufactured by drawing a metal plate having a predetermined shape, for example, and the fixing member 50 is relatively easy by pressing a metal plate having a predetermined shape, for example. Therefore, according to the connection structure JS, it is easy to connect the first pipe 10 and the second pipe 40 at a low cost. It is easy to form (assemble) the connection structure JS itself.

  In forming the connection structure JS, first, the first pipe 10, the seal member 20, the shaft misalignment prevention tool 30, the second pipe 40, and the fixing member 50 are prepared. The pipe 10 is inserted in a predetermined direction. Further, the seal member 20 is attached to the first pipe 10. Next, as indicated by an arrow A in FIG. 7, the first pipe 10 and the second pipe 40 are relatively moved, and one end side where the first flange portion 5 a is formed in the first pipe 10. And the pipe insertion portion 23 in the shaft misalignment prevention tool 30 are inserted into the large-diameter portion 33 of the second pipe 40 as shown in FIG. Thereafter, each of the first pipe 10, the shaft misalignment prevention tool 30, and the second pipe 40 is sandwiched from the outside in the radial direction as described above by the two arm portions 45 a and 45 b of the fixing member 50. The positions of the first pipe 10, the shaft misalignment prevention tool 30, and the second pipe 40 are defined. Thereby, the connection structure JS is formed. Since each component shown in FIG. 7 has already been described with reference to FIG. 2, the description thereof is omitted here.

  As described above, the pipe connection structure of the present invention has been described with reference to the embodiment. However, as described above, the present invention is not limited to the above-described form. For example, the pipe insertion portion in the shaft misalignment prevention device may be a hollow body in which an internal space having a size capable of passing the first pipe is formed, and the shape thereof is a hollow polygonal shape, a hollow cylinder, or the like. can do.

  Regardless of the shape of the pipe insertion part, depending on the allowable value of the axial deviation between the first pipe and the second pipe in the connection structure to be formed, The size is selected such that the inner peripheral surface is in contact with or close to the outer peripheral surface of the first pipe, and the outer peripheral surface is in contact with or close to the inner peripheral surface of the second pipe. Similarly, the length of the pipe fixing portion is appropriately selected according to the pipe diameter of each pipe so that the axial deviation between the first pipe and the second pipe can be suppressed within a desired range. . The contour shape of the first flange portion for positioning in the shaft misalignment prevention tool and the shape of the second flange portion for positioning in the second pipe can also be selected as appropriate.

  The fixing member includes a cap portion that can partially insert the positioning first flange portion of the shaft misalignment prevention tool and the positioning second flange portion of the second pipe. It may be formed. By appropriately selecting the width of the cap portion, the first flange portion for positioning and the second flange portion for positioning can be brought into close contact with each other, and the shaft misalignment preventing member can be fixed to the second pipe. The second arcuate portion that is partially pressed against the outer peripheral surface of the second pipe may be omitted. About the connection structure of piping of this invention, various deformation | transformation, a modification, a combination, etc. are possible besides what was mentioned above.

It is a side view which shows roughly an example of the connection structure of piping of this invention. FIG. 2 is a longitudinal sectional view schematically showing the connection structure shown in FIG. 1. It is the schematic of the end surface along the III-III line | wire shown in FIG. It is a side view which shows roughly the axis deviation prevention tool used with the connection structure shown in FIG. FIG. 5 is a bottom view schematically showing the shaft misalignment prevention tool shown in FIG. 4. FIG. 2 is a side view schematically showing a fixing member used in the connection structure shown in FIG. 1. It is sectional drawing which shows schematically the 1st piping and 2nd piping in the process of forming the connection structure shown in FIG.

Explanation of symbols

5a 1st flange part 5b 2nd flange part 10 1st piping 20 Seal member 23 Piping insertion part 25 2nd flange part for positioning 30 Axial misalignment prevention tool 33 Large diameter part 35 2nd flange part for positioning 40 2nd Piping 41 Long hole 42 First arcuate part 43 Second arcuate part 45a, 45b Arm part 50 Fixing member JS Piping connection structure

Claims (8)

A first pipe having a seal member attached to one end thereof;
An axial misalignment prevention tool having a tubular pipe insertion portion through which the first pipe is passed;
A second pipe into which the one end side of the first pipe and a pipe insertion portion of the shaft misalignment prevention tool are inserted;
An inner peripheral surface of the pipe insertion portion of the shaft misalignment prevention tool is in contact with or close to an outer peripheral surface of the first pipe, and an outer peripheral surface of the pipe insertion portion of the shaft misalignment prevention tool is the second pipe Piping connection structure characterized by being in contact with or close to the inner peripheral surface. The shaft misalignment preventing tool has a first flange portion for positioning formed at one end of the pipe insertion portion and projecting outward.
The second pipe has a positioning second flange portion formed at one end and projecting outward,
The one end side of the first pipe and the pipe insertion part of the shaft misalignment prevention tool are inserted into the second pipe from the second flange part for positioning of the second pipe,
The first flange portion for positioning of the shaft misalignment prevention tool and the second flange portion for positioning of the second pipe are engaged, and the first flange portion for positioning and the second flange portion for positioning are brought into close contact with each other. The pipe connection structure according to claim 1, further comprising a fixing member that fixes the shaft misalignment prevention tool to the second pipe.   The fixing member is a clamp that sandwiches the second pipe from both sides in the radial direction by an elastic force, and includes a first flange portion for positioning the shaft misalignment preventing member and a second flange portion for positioning the second pipe. 3. The pipe connection structure according to claim 2, wherein one engagement portion is provided on each of both radial sides of the second pipe.   The engaging portion is a long hole into which the first positioning flange portion and the second positioning flange portion are partially inserted, and the length of the long hole is the first positioning flange portion. 4. The piping connection structure according to claim 3, wherein the piping connection structure is larger than an outer size of the positioning second flange portion.   5. The wiring connection structure according to claim 2, wherein the fixing member has a first arc-shaped portion that is partially pressed against an outer peripheral surface of the first pipe.   6. The wiring connection structure according to claim 2, wherein the fixing member has a second arc-shaped portion that is partially pressed against an outer peripheral surface of the second pipe.   The pipe connection structure according to claim 1, wherein the pipe insertion portion of the shaft misalignment prevention tool has a hollow polygonal column shape. The first pipe includes a first flange portion formed on the one end side and projecting outward, and a second flange portion formed at an interval from the first flange portion and projecting outward. Have
The seal member is attached to the first pipe between the first flange portion and the second flange portion,
The second flange portion of the first pipe has a diameter larger than the diameter of the pipe insertion portion of the shaft misalignment prevention member, and restricts the movement range of the shaft misalignment prevention member along the first pipe. Function as a stopper to
The piping connection structure according to any one of claims 1 to 7, wherein

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