JP2019143660A - Manufacturing method of pipe connecting structure - Google Patents

Abstract

To provide a pipe connecting structure which is improved in sealing performance by surely preventing the rotation of a connecting pipe (pipe joint), and the come-off of the connecting pipe (pipe joint).SOLUTION: A piping connecting structure 100 connects two connecting pipes 10, 10 via a joint pipe 20. The joint pipe 20 has a socket part 21 which is expanded at a tip part. The connecting pipe 10 has an annular bulged part 11 which is inserted into the socket part 21, and bulged to the outside at the middle of the tip part. The tip part of the socket part 21 straddles the bulged part 11, and is crimped to an external peripheral part of the connecting pipe 10 by using a press tool. A tip face of the connecting part 10 abuts on a wall part 22 of an inner depth part of the socket part 21. A cylindrical seal member 30 is interposed in a gap between the socket part 21 and the connecting pipe 10.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a pipe connection structure for transporting a gas such as steam or air, a fluid such as water or oil, a powder, or a granule, and a method for manufacturing the same.

Conventionally, a pipe connection structure for connecting connection pipes to each other via a joint pipe is known.
In Patent Document 1, an annular groove is provided on the inner surface of the socket as a press-type pipe joint that is inserted into a socket part of a joint pipe and tightened to connect, and an O-ring is provided as a seal member in the annular groove. , And a part of the socket part is pressure-bonded to the connecting pipe, and the annular groove part is also pressed to crimp the O-ring into the outer peripheral surface of the connecting pipe in a crimped state.

  Patent Document 2 describes a case where a connecting pipe is inserted into a socket part of a joint pipe, and a cylindrical seal member made of an elastic material such as rubber is provided in a gap between the socket part and the connecting pipe.

JP-A-8-226582 JP-A-3-092691

  However, considering the conventional pipe connection structure, it is desired to further improve the sealing performance by reliably preventing the connection pipe (pipe joint) from rotating and the connection pipe (pipe joint) from coming out.

  Since the pipe connection structure of Patent Document 1 uses an O-ring as a seal member, the contact area between the seal member and the connection pipe is limited, and the connection between the socket portion and the connection pipe depends on pressure bonding by a press. Therefore, there is a possibility that deformation of the connection pipe (pipe joint) may occur due to the pressure of the fluid in the connection pipe (pipe joint), deterioration of the pipe connection structure body with time, vibration, etc. is there.

  Further, the pipe connection structure described in Patent Document 2 is provided with a cylindrical seal member in the gap between the socket portion and the connection pipe, so that the contact area of the seal member can be increased, but the connection pipe is prevented from coming out. It is not structured. Moreover, in order to improve sealing characteristics, it is necessary to further improve the adhesiveness of the sealing member.

In view of the above-mentioned problems, the pipe connection structure according to the present invention is inserted into the joint pipe (20) having the socket part (21) formed by expanding the tip part and the socket part (20), and in the middle of the tip part. A connecting pipe (10) having an annular bulging portion (11) formed by bulging outward,
The tip of the socket (21) is crimped to the outer periphery of the connecting pipe (10) across the bulging part (11), and the tip of the connecting pipe (10) is the inner wall of the socket (20). A cylindrical seal member (30) is introduced into the gap between the socket part (21) and the connecting pipe (10).

According to the present invention, since the cylindrical seal member (30) is provided in the gap between the socket portion (21) and the connection pipe (10), the dimension of the seal member (30) in the tube axis direction is increased. Thereby, the contact area of a sealing member (30) can be enlarged. Also,
Since the tip of the socket part (21) is crimped to the outer peripheral part of the connection pipe (10) across the bulging part (11), the connection pipe (10) (joint pipe (20)) is formed by the anchor effect. It is possible to prevent the tube from coming out in the tube axis direction.

  Moreover, the manufacturing method of the pipe connection structure by this invention has the socket part (21) formed by expanding a front-end | tip part, and the joint by which the sealing member introduction port (23) was provided in the side surface of the socket part (21) A pipe (20) and a connecting pipe (10) having an annular bulge part (11) bulging outwardly in the middle of the tip part are prepared, and the tip part of the socket part (21) bulges Insert the connection pipe (10) into the socket part (21) so as to straddle the part (11) and so that the front end surface of the connection part (10) hits the wall part (22) of the inner back part of the socket part (21) The step of crimping the tip of the socket part (21) straddling the bulging part (11) to the outer peripheral part of the connecting pipe (10), and the socket part (21) through the seal member inlet (23). Introducing a liquid or gel seal member (30) into the gap between the pipe and the connecting pipe (10) Characterized by comprising a step of curing the sealing member (30) introduced into the gap between the socket portion (21) and the connecting tube (10), the.

  According to the present invention, the liquid or gel seal member (30) is introduced into the gap between the socket part (21) and the connection pipe (10) through the seal member introduction port (23), and the socket part (21 ) And the connecting pipe (10), the sealing member (30) introduced into the gap is cured, so that the sealing performance and adhesiveness of the sealing member (30) can be improved.

  According to the present invention, it is possible to reliably prevent the rotation of the connecting pipe (pipe joint) and the disconnection of the connecting pipe (pipe joint), thereby improving the sealing performance.

It is the top view and front view of a pipe connection structure in an embodiment of the present invention. It is sectional drawing in the XX line of FIG.

  Next, a pipe connection structure according to an embodiment of the present invention will be described with reference to FIGS. 1A and 1B are views showing the pipe connection structure 100, FIG. 1A is a plan view of the pipe connection structure 100, and FIG. 1B is a front view thereof. 2 is a cross-sectional view taken along line XX of FIG.

  The pipe connection structure 100 connects two connection pipes 10 and 10 via a joint pipe 20. The joint pipe 20 has a socket part 21 having an enlarged tip part. The connecting pipe 10 is inserted into the socket part 21. The connecting pipe 10 has an annular bulging portion 11 that bulges outward in the middle of the tip portion. The bulging portion 11 is formed by partially expanding the connecting pipe 10.

  The distal end portion of the socket portion 21 straddles the bulging portion 11 and is crimped to the outer peripheral portion of the connection pipe 10 using a press tool. Specifically, the distal end portion of the socket portion 21 is crimped to the outer peripheral surface of the bulging portion 11, and further extends along the connecting pipe 10 across the bulging portion 11, and the bulging portion 11 is not formed. It is crimped to the smooth outer periphery of the connecting tube 10.

  The distal end surface of the connecting pipe 10 is abutted against the wall portion 22 at the inner back portion of the socket portion 21. The wall portion 22 is formed by expanding the diameter of the socket portion 21, and connects the socket portion 21 and the portion of the joint pipe 20 that is adjacent to the socket portion 21 and is not expanded in diameter. The wall portion 22 is provided obliquely with respect to the tube axis direction of the socket portion 21 in the drawing, but may be provided at right angles to the tube axis direction.

  A cylindrical sealing member 30 is introduced into the gap between the socket portion 21 and the connecting pipe 10. On the side surface of the socket portion 21, there is provided a seal member introduction port 23 for introducing the seal member 30 into the gap between the socket portion 21 and the connection pipe 10. The seal member 30 is composed of a rubber or other elastic packing material such as rubber or a caulking material or an adhesive, or a silicone-based liquid or gel-like sealing material in order to achieve high airtightness, high adhesiveness, etc. Is done.

  According to this pipe connection structure 100, since the cylindrical seal member 30 is provided in the gap between the socket portion 21 and the connection pipe 10, there is a degree of freedom in the dimension of the seal member 30 in the tube axis direction. The contact area of the seal member 30 can be increased by increasing.

  Moreover, since the front-end | tip part of the socket part 21 is crimped | bonded to the outer peripheral part of the connection pipe 10 across the bulging part 11, it prevents that the connection pipe 10 (joint pipe | tube 20) slips out in a pipe-axis direction by an anchor effect. can do. And as a synergistic effect of these structures, rotation of the connecting pipe 10 (pipe joint 20) and pull-out of the connecting pipe 10 (joint pipe 20) can be reliably prevented, and the sealing performance can be improved.

  Next, a method for manufacturing the pipe connection structure 100 will be described. First, the connecting pipe 10 is inserted into the socket part 21. At this time, the connecting tube 10 is inserted so that the tip end of the socket portion 21 straddles the bulging portion 11 and the tip end surface of the connection portion 10 abuts against the inner wall portion 22 of the socket portion 21.

  Next, the tip of the socket part 21 straddling the bulging part 11 is crimped to the outer peripheral part of the connecting pipe 10 using a press tool.

  Next, the liquid or gel-like seal member 30 is introduced into the gap between the socket portion 21 and the connection pipe 10 through the seal member introduction port 23, and then the gap between the socket portion 21 and the connection pipe 10 is introduced. The introduced sealing member 30 is cured by drying, heating, chemical reaction or the like. By introducing and filling the liquid or gel seal member 30 through the seal member introduction port 23, the cylindrical seal member 30 can be easily formed in the gap. Further, the curing of the seal member 30 can be promoted through the seal member introduction port 23.

  In this case, the introduction time of the seal member 30 can be shortened by providing a plurality of seal member introduction ports 23. Further, by providing a sealing member discharge port on the side surface of the socket portion 21, and configured so that the sealing member 30 introduced from the sealing member introduction port 23 can be discharged together with the gas, fluid, etc. in the gap, The seal member 30 can be filled without causing a residue in the gap. By providing a plurality of sealing member discharge ports, the filling time of the sealing member 30 can be shortened.

  In addition, since the seal member 30 is introduced in a liquid or gel state and then cured, the bonding between the socket portion 21 and the connecting pipe 10 is higher than that in which a solid seal member is installed from the beginning. And adhesion can be obtained.

  In the above-described embodiments, the socket-type pipe connection structure has been described as an example. However, the present invention is not limited to this, and various pipes such as a T-type, an L-type, a Y-type, a strainer type, and a plug type are used. It can be applied to the connection structure. Furthermore, the present invention can be widely applied to a connection structure of a pipe for transporting a gas such as steam or air, a fluid such as water or oil, powder, or granules.

DESCRIPTION OF SYMBOLS 10 Connection pipe 11 Bulging part 20 Joint pipe 21 Socket part 22 Wall part 23 Seal member introduction port 30 Seal member

In view of the above-described problems, the method for manufacturing a pipe connection structure according to the present invention has a socket part (21) having a diameter enlarged tip part, and a seal member inlet (23) is provided on the side surface of the socket part (21). A joint pipe (20) provided and a connection pipe (10) having an annular bulge portion (11) bulging outward in the middle of the tip portion are prepared, and the tip of the socket portion (21) part is straddling bulging portion (11), and as the distal end surface of the connecting tube (10) abuts against the wall portion of the inner back portion of the socket portion (21) (22), connecting tube (10) the socket part ( 21), the step of crimping the tip of the socket part (21) straddling the bulging part (11) to the outer peripheral part of the connecting pipe (10), and the seal member introduction port (23) through the socket. A liquid or gel seal member (30) in the gap between the portion (21) and the connecting pipe (10) A step of entering a step of curing the sealing member (30) introduced into the gap between the socket portion (21) and the connecting tube (10), forming a seal member (30) cylindrical in the gap It is characterized by providing.

According to the present invention, since the cylindrical seal member (30) is provided in the gap between the socket portion (21) and the connection pipe (10), the dimension of the seal member (30) in the tube axis direction is increased. Thereby, the contact area of a sealing member (30) can be enlarged. Moreover, since the front-end | tip part of the socket part (21) is crimped | bonded to the outer peripheral part of the connection pipe (10) straddling the bulging part (11), a connection pipe (10) (joint pipe (20) by an anchor effect) ) Can be prevented from coming off in the tube axis direction. Further , according to the present invention, the liquid or gel-like seal member (30) is introduced into the gap between the socket part (21) and the connecting pipe (10) through the seal member introduction port (23), and the socket part Since the sealing member (30) introduced into the gap between (21) and the connecting pipe (10) is cured, the sealing performance and adhesiveness of the sealing member (30) can be improved.

Claims (3)

A joint pipe (20) having a socket part (21) formed by expanding the tip part;
A connecting pipe (10) having an annular bulging portion (11) inserted into the socket portion (20) and bulging outward in the middle of the tip portion;
The tip of the socket (21) is crimped to the outer periphery of the connecting pipe (10) across the bulging part (11), and the tip of the connecting pipe (10) is the inner wall of the socket (20). Part (22),
A pipe connection structure, wherein a cylindrical seal member (30) is introduced into a gap between the socket portion (21) and the connection pipe (10).   The pipe connection structure according to claim 1, wherein a seal member introduction port (23) for introducing the seal member (30) into the gap is provided on a side surface of the socket portion (21). A joint pipe (20) having a socket part (21) formed by expanding the tip part and having a seal member inlet (23) provided on the side surface of the socket part (21), and an outer part in the middle of the tip part A connecting pipe (10) having an annular bulging portion (11) formed by bulging into
The connecting pipe so that the tip of the socket part (21) straddles the bulging part (11) and the tip of the connection part (10) abuts against the inner wall part (22) of the socket part (21). Inserting (10) into the socket part (21);
Crimping the tip of the socket part (21) straddling the bulging part (11) to the outer peripheral part of the connecting pipe (10);
Introducing the liquid or gel seal member (30) into the gap between the socket portion (21) and the connection pipe (10) through the seal member introduction port (23);
Curing the sealing member (30) introduced into the gap between the socket part (21) and the connection pipe (10).

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