JP6529055B1 - Tube connection structure - Google Patents

Abstract

An object of the present invention is to provide a pipe connection structure in which the pipe resistance due to the inner step of the pipe is eliminated and the field work is facilitated. A joint pipe (10) has a socket portion (11) formed by increasing the diameter of a tip end portion. The connecting pipe 20 has a bulging portion 21 having an arc cross-sectional shape. The front end surface of the connection pipe 20 is abutted against the inner back wall of the socket portion 11. The inner circumferential surface of the portion excluding the socket portion 11 of the joint pipe 10 and the inner circumferential surface of the portion excluding the bulging portion 21 of the connection tube 20 are flush with each other. The first seal member 30 is fitted in the gap between the socket portion 11 and the connection pipe 20. The union 40 is fixed to the outer peripheral surface of the socket portion 11 so that the nut 50 is fastened to the union 40. [Selected figure] Figure 1

Description

  The present invention relates to a pipe connection structure for circulating a gas such as steam or air, a fluid such as water or oil, powder, or particles.

  Conventionally, when connecting and piping a pipe, a joint portion is required. As a method of forming a joint part, there is known a method in which a joint pipe of a cast product is subjected to screw cutting or the like to connect a connection pipe, a method in which a connection pipe is welded to the joint pipe, and the like.

  In Patent Document 1, an annular seal member is formed on the inner peripheral portion of the first pipe fixed to the union for the purpose of being able to be easily manufactured without complicating the pipe processing and improving the sealing performance. An annular seal member stopper is press-fit onto the inner periphery of the first pipe so as to hold the seal member on the inner periphery of the first pipe, and the first seal member stopper and the inner periphery of the seal member A pipe connection in which the first and second pipes are connected by inserting a second pipe to be connected to the pipe, and fastening a nut and a union fitted on the outer periphery of the second pipe. The structure is described.

  Further, in Patent Document 1, in order to prevent the first pipe from coming out, a "brim" is formed at the tip of the first pipe, and this "bump" is made of union. It is described to be sandwiched between the tip and the "workpiece" of the second tube.

Unexamined-Japanese-Patent No. 5-44875

  However, the method using a joint pipe of a cast product has problems such as heavy weight, many processing steps, and many inspection items for quality control. In addition, the method using welding requires skill and there is a problem that the construction time becomes long.

  Further, in the pipe connection structure described in Patent Document 1, there is a step between the inner peripheral surfaces of the first and second pipes, so there is a problem that fluid or the like flowing in the pipe receives piping resistance due to the step. The Furthermore, although the "processed part" of the above-mentioned second pipe is recognized as a projection formed by crushing the pipe, such "processed part" is usually processed at factory equipment, and piping There is also a problem that processing at the work site is difficult.

In view of the above problems, the pipe connection structure according to the present invention includes a joint pipe having a socket portion formed by expanding a tip end portion, and a bulging that is inserted into the socket portion and bulges outward in the middle of the tip portion A connecting pipe having a portion, an annular first seal member fitted in a gap between the socket and the connecting pipe, a union fixed to the outer peripheral surface of the socket, and an outer periphery of the connecting pipe A tip of the socket portion is in contact with an outer peripheral surface of the bulging portion, and a tip surface of the connection pipe is a portion of the inner back portion of the socket portion The inner peripheral surface of the portion excluding the socket portion of the joint pipe butting against the wall portion is flush with the inner peripheral surface of the portion excluding the bulging portion of the connection pipe , the socket End face of the part, the union, the outer peripheral surface of the bulging part, and Characterized in that it comprises a second sealing member of clearance fitting is an annular enclosed by and.

  According to the pipe connection structure of the present invention, since it is possible to assemble by directly machining a normal piping material (pipe material), in addition to being able to achieve weight reduction and cost reduction, a skilled technique is required. The piping can be easily assembled without

  Moreover, according to the pipe connection structure of the present invention, since there is no internal level difference of piping, piping resistance can be eliminated.

It is sectional drawing of the pipe | tube connection structure in the 1st Embodiment of this invention. It is sectional drawing of the pipe connection structure in the 2nd Embodiment of this invention. It is a figure which shows the example of piping construction using pipe | tube connection structure 100, 100A.

  Next, a pipe connection structure 100 according to a first embodiment of the present invention will be described based on FIG. FIG. 1 is a cross-sectional view showing a pipe connection structure 100. As shown in FIG.

  The pipe connection structure 100 is for connecting the joint pipe 10 and the connection pipe (pipe) 20. The joint pipe 10 and the connection pipe 20 are cut out from the same pipe material, and have the same inner diameter and outer diameter before processing. The joint pipe 10 has a socket portion 11 whose diameter is increased at its tip. The connection pipe 20 is inserted into the socket portion 11. The connecting pipe 20 has a bulging portion 21 which bulges outward in the middle of the tip end portion. The bulging portion 21 is formed by enlarging a diameter of a portion receding from the tip of the connection pipe 20, and can be easily processed using a general diameter expansion jig at a piping work site.

  The tip of the socket portion 11 is in contact with the outer peripheral surface of the bulging portion 21, preferably the outer peripheral surface of the top portion of the bulging portion 21. The front end surface of the connection pipe 20 is abutted against the inner back wall of the socket portion 11.

  Since the inner peripheral surface of the portion excluding the socket portion 11 of the joint pipe 10 and the inner peripheral surface of the portion excluding the bulging portion 21 of the connection pipe 20 are flush with each other, that is, flat without steps, Can be eliminated.

  An annular first seal member 30 is fitted in the gap between the socket portion 11 and the connection pipe 20 in order to ensure the high airtightness and high adhesion of the pipe connection structure. Specifically, the first seal member 30 is fitted in the gap between the socket portion 11, the bulging portion 21 and the connecting pipe tip end portion 22 on the tip end side of the bulging portion 21. The first seal member 30 is made of an elastic packing material such as rubber, an O-ring, a caulking material, an adhesive, or a liquid or gel sealant such as a silicone-based material.

  A cylindrical union 40 which is a connecting member is fixed to a region extending from the tip end of the joint pipe 10 through the enlarged diameter step portion of the socket portion 11 to the outer peripheral surface of the socket portion 11. A screw portion is engraved on the outer peripheral surface of the union 40 for screwing with the nut 50.

  The nut 50 is fitted to the outer peripheral surface of the connection pipe 20 and is fastened to the union 40 by screwing. In this case, the union 40 abuts on the enlarged diameter step portion of the socket portion 11, the nut 50 abuts on the outer peripheral surface of the bulging portion 21 of the connection pipe 20, and the tip end surface of the connection pipe 20 Since it abuts on the inner wall, the joint pipe 10 and the connection pipe 20 can be firmly connected to achieve high sealing performance.

  Further, the tip end face of the socket portion 11 has a margin for fastening by the union 40 / nut 50, and slightly retracts from the engagement face between the union 40 and the nut 50 in order to prevent deformation of the socket portion 11 due to fastening. There is. Therefore, a slight gap surrounded by the tip end surface of the socket portion 11, the outer peripheral surface of the bulging portion 21, the union 40 and the nut 50 is generated. An annular second seal member 31 is inserted into the gap. The second seal member 31 can be configured in the same manner as the first seal member 30.

  According to the above-described piping connection structure 100, since it can be assembled by directly machining an ordinary pipe (pipe material) without using a cast product, it is possible to achieve weight reduction and cost reduction. Assembling of piping can be easily performed without the need for skilled techniques. Moreover, since there is no internal level | step difference, piping resistance can be eliminated.

  Next, a pipe connection structure 100A according to a second embodiment of the present invention will be described based on FIG. FIG. 2 is a cross-sectional view showing the pipe connection structure 100A. The pipe connection structure 100A of the second embodiment is different from the pipe connection structure 100 of the first embodiment in that the socket portion 11 of the pipe joint 10 has a first socket portion 11a formed by expanding the diameter of the tip end portion. This is a point provided with a second socket portion 11b connected to the tip end side of the first socket portion and having a diameter larger than that of the first socket portion 11a. That is, the inner diameter of the second socket 11b is larger than the inner diameter of the first socket 11a.

  The annular first seal member 30 is fitted in the gap between the second socket portion 11 b and the connection pipe 20. Further, the annular second seal member 31 is fitted in a gap surrounded by the tip end surface of the second socket portion 11 b, the outer peripheral surface of the bulging portion 21, the union 40 and the nut 50.

  The union 40 is fixed to the outer peripheral surface of the first and second socket portions 11 a and 11 b, and the nut 50 is fitted to the outer peripheral surface of the connection pipe 20 and is fastened with the union 40.

  Further, the tip end portion of the second socket portion 11 b is in contact with the outer peripheral surface of the bulging portion 21, preferably the outer peripheral surface of the top portion of the bulging portion 21. The front end surface of the connection pipe 20 is abutted against the inner back wall of the first socket portion 11a. The inner circumferential surface of the portion excluding the first and second socket portions 11a and 11b of the joint pipe 10 is flush with the inner circumferential surface of the portion excluding the bulging portion 21 of the connecting tube 20.

  Further, as a feature of the second embodiment, the inner peripheral surface of the first socket portion 11 a is fixed to the outer peripheral surface of the connecting pipe tip 22 at the tip end side of the bulging portion 21 of the connecting pipe 20. Thereby, since the bonded area of the pipes is increased, the pipe connection structure 100A reliably prevents the connection shake, rotation, and detachment of the connection pipe 20 (joint pipe 10), and the connection pipe 20 (joint pipe 10). The sealing performance can be improved by improving the strength against bending and the strength against pressure of fluid flowing in the connecting pipe 20 and the joint pipe 10.

  Further, in the first and second embodiments, as shown in FIGS. 1 and 2, the cross section of the bulging portion 21 has a circular arc cross sectional shape, but the present invention is not limited thereto. It may have a certain cross-sectional shape or a rounded cross-sectional shape.

  Next, an example of piping construction using the pipe connection structure 100, 100A in the first and second embodiments described above will be described based on FIG. The types of the joint pipe 10 include a straight (straight pipe) joint pipe 10S, an L-shaped joint pipe 10L bent in an L-shape, and a T-shaped joint pipe 10T branched in a T-shape. A straight connection pipe 20 is connected to these joint pipes 10S, 10L, 10T by the above-mentioned pipe connection structure 100, 100A.

  In this case, the straight connection pipe 20 has a plurality of predetermined lengths, for example, 1 m, 0, 9 m, 0.8 m, 0.7 m, 0.6 m, 0.5 m, 0.4 m, 0.3 m in advance. In addition to the fact that the on-site piping work is significantly reduced by preparing a 0.2 m-piece, it is possible to easily assemble the piping without the need for the experience, the skill, etc. of the operator.

DESCRIPTION OF SYMBOLS 10 Joint pipe 11 Socket part 11a 1st socket part 11b 2nd socket part 20 Connection pipe 21 bulging part 22 Connection pipe tip part 30 1st seal member 31 2nd seal member 40 Union 50 Nut 100, 100A pipe Connection structure

Claims (3)

A joint pipe having a socket portion formed by expanding a tip end portion,
A connecting pipe having a bulging portion which is inserted into the socket portion and bulges outward in the middle of the tip end portion;
An annular first seal member fitted in a gap between the socket and the connection pipe;
A union secured to the outer peripheral surface of the socket portion;
And a nut fitted on an outer peripheral surface of the connection pipe and fastened to the union.
The tip end of the socket portion is in contact with the outer peripheral surface of the bulging portion,
The tip end face of the connection pipe is abutted against the inner back wall of the socket part, and the inner peripheral surface of the part excluding the socket part of the joint pipe and the part excluding the bulging part of the connection pipe An annular second seal member which is flush with the inner peripheral surface of the socket and is fitted in the end portion of the socket portion, the union, the outer peripheral surface of the bulging portion, and the gap surrounded by the nut Pipe connection structure characterized by having. A joint pipe having a first socket portion formed by expanding a tip end portion, and a second socket portion connected to the tip end side of the first socket portion and having a diameter larger than that of the first socket portion;
A connecting pipe having a bulging portion which is inserted into the first and second socket portions and bulges outward in the middle of the tip end portion;
An annular first seal member fitted in a gap between the second socket portion and the connection pipe;
A union secured to the outer peripheral surface of the first and second socket portions;
And a nut fitted on an outer peripheral surface of the connection pipe and fastened to the union.
The tip of the second socket is in contact with the outer peripheral surface of the top of the bulging portion,
The tip end surface of the connection pipe abuts against the inner back wall portion of the first socket portion,
The inner circumferential surface of the portion excluding the first and second socket portions of the joint pipe and the inner circumferential surface of the portion excluding the bulging portion of the connection tube are flush with each other,
An inner peripheral surface of the first socket portion is fixed to an outer peripheral surface of a distal end portion of a connecting pipe at a tip end side of the bulging portion of the connecting pipe. A joint pipe having a first socket portion formed by expanding a tip end portion, and a second socket portion connected to the tip end side of the first socket portion and having a diameter larger than that of the first socket portion;
A connecting pipe having a bulging portion which is inserted into the first and second socket portions and bulges outward in the middle of the tip end portion;
An annular first seal member fitted in a gap between the second socket portion and the connection pipe;
A union secured to the outer peripheral surface of the first and second socket portions;
And a nut fitted on an outer peripheral surface of the connection pipe and fastened to the union.
The tip end of the second socket portion is in contact with the outer peripheral surface of the bulging portion,
The tip end surface of the connection pipe is abutted against the inner back wall of the first socket portion, and the connection is made with the inner peripheral surface of the portion excluding the first and second socket portions of the joint pipe It is flush with the inner circumferential surface of the tube excluding the above-mentioned bulging part,
The inner peripheral surface of the first socket portion is fixed to the outer peripheral surface of the connection pipe tip end portion on the tip end side of the bulging portion of the connection pipe, and the tip surface of the second socket portion, the union, the bulging A pipe connection structure comprising: an outer peripheral surface of a portion; and an annular second seal member fitted in a gap surrounded by the nut.

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