JPS62297586A - Pipe connecting structure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a pipe connection structure that connects each end of a pair of pipes.

[Prior Art] As a conventional pipe connection structure, for example, Japanese Utility Model Publication No. 55-975
There is one described in Publication No. 0. This pipe connection structure is
A socket-shaped flange part is formed at one end of the pair of container pipes, and a tapered flange part is formed at the other end, and the socket-shaped flange part and the taper part are formed at the other end. A ring-shaped seal member is interposed between the shaped flange portions.

A male-threaded fastener that engages with the tube end flange portion of one tube end in the tube axial direction is attached to the one tube end, and also engages with the tube end flange portion of the other tube end in the tube axial direction. A female threaded fastener to be engaged is attached to the other pipe end, and the two fasteners are caged together so as to cover both the pipe end flanges and the sealing member,
A sealing member was crimped between both tube end flanges.

As a result, the pair of tubes are connected with a sealing member interposed between the flange surfaces of the flange portions at each tube end, so
The joints at both ends were airtight and watertight.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional pipe connection structure, the flange portion of the container pipe to be connected is expanded into a socket shape or a tapered shape. The connection length L in the pipe axis direction at the end of the pipe becomes large, making it difficult to use these connection structures in narrow piping spaces such as inside walls and floors of houses.

In addition, when the respective pipe ends are fastened together by each fastening body, the fastening force is applied to the flange surface that is not perpendicular to the pipe axis as described above, and the connecting portion is resistant to tensile force in the pipe axis direction. Connection strength becomes relatively weak.

In addition, the sealing member disposed between the ends of the pipes to be abutted was only interposed in a state where it was in contact with the flange surface of each flange part, and as a result, the sealing member was misaligned during the process of connecting the container pipes. , falling off.

There is a risk that the sealing member may not be set at the optimum crimping position between the opposing flange surfaces. When such a phenomenon occurs, the sealing performance, that is, the watertightness or airtightness at both the joints is impaired.

Furthermore, the containers must be placed in proper abutment positions during the connection process, which requires special means and operations, which makes the connection process more difficult.

An object of the present invention is to make the structure more compact, to improve the connection strength and sealing performance of the container tubes, and to improve the workability of connecting the container tubes.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a tube end flange that expands each tube end portion of a pair of tubes outward in a plane substantially perpendicular to the tube axis. This is a pipe connection structure in which a sealing member is crimped between nine end flanges of a Pi pipe, and the pipes are locked to the outer periphery of the end flanges of both pipes.

A sealing member holding part is provided between opposing flange surfaces of both pipe end flange parts, and a sealing member which is crimped between each flange surface is held on both sides of the sealing member holding part, and an outer peripheral part of the sealing member holding part is provided. A female threaded fastener comprising a cylindrical connection part extending outward from the pipe end flange part in both pipe axial directions, and a female threaded part provided in each cylindrical connection part; It is divided in the circumferential direction so that it can be installed from the inside, and is inserted into the inner surface of the cylindrical connection part provided in the female threaded fastener in a state where it is combined, and has a male threaded part that screws with the female threaded part of the cylindrical connection part. A pair of male-threaded fasteners are provided, each of which has a pressing portion in contact with the tube end flange portion at a distal end thereof which is connected to the cylindrical connecting portion.

[Operation] According to the present invention, the male threaded portion of the male threaded fastener attached to the pipe end of the container pipe and the female threaded portion of the female threaded fastener are screwed together, so that each male threaded fastener is By pressing the outer surface of the flange portion with the pressing portion of the container tube, the flange surface of the container tube and the sealing member are pressed, and the ends of both tubes can be connected in a close state. At this time, each flange part to be connected is formed by expanding the pipe end part outward in a plane substantially perpendicular to the pipe axis.
The container tubes are connected with a sealing member interposed between each tube end flange portion, and the connection length at each tube end is shortened, making it possible to provide a compact tube connection structure.

In addition, the pressing force in the pipe pulling direction generated by the screw engagement of the male threaded part of the male threaded fastener attached to the pipe end of the container pipe and the female threaded part of the female threaded fastener is applied to the pipe by each pressing part. Since it acts on the entire flange section that is approximately perpendicular to the axis, it acts on the tensile force in the tube axis direction at the connection section.

This results in an improvement in the strength of the connection.

Further, the sealing member interposed between the connected pipe ends is held by a female threaded fastener that is secured to the outer circumferential surface of each pipe end flange. Therefore, it is possible to ensure the positioning of the seal member at the stage of the connection work, and to always position the seal member at the overpressure bonding position between the flange portions of both pipes.

This makes it possible to improve the sealing performance at the connection part of the container tube.

In addition, each tube is positioned so as to be inserted into the cylindrical connection portion of the female threaded fastener at an intermediate stage of the connection operation, and the tube ends are always abutted and held in an optimal connection state. In addition, the male threaded fastener is inserted into the inner surface of the cylindrical connection part in the intermediate assembled state as described above, and in this state, the male thread of the male threaded fastener and the female thread of the female threaded fastener are connected. The part that is screwed together becomes the turning part. Therefore, it is possible to easily complete the connection work without adding special means or operations for temporarily holding the six pipes and their connecting components at an intermediate stage of the connection work.

Furthermore, in the above connection work, the male threaded fastener is attached to each pipe end from the pipe radial direction and is divided into six pipes in the circumferential direction. There is no need to cover the externally threaded fastener, and connection workability can also be improved in this respect.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing a V-connection structure according to an embodiment of the present invention, FIG. 2 is a view taken along the line ■-■ in FIG. A cross-sectional view showing the state in which the pipe ends are inserted into the connection parts, and Figure 4 shows the state in which the threaded fastener is attached to the pipes to be connected! Figure 2 shows the island in the direction of the arrows,
FIG. 5 is a perspective view showing the main part of the male threaded fastener attached to the six pipes, and FIGS. 6 to 9 are cross-sectional views showing the process of forming the pipe end flange.

A pair of 6 pipes 10A and IO connected in FIG.
A tube end flange portion 11 is formed at each tube end portion of B. Each tube end flange portion 11 is arranged in the tube axis direction [arrow A
direction] and expands outward in a plane perpendicular to the direction.

The flange portion 11 is formed in the order shown in FIGS. 6 to 9. First, as shown in FIG. 12 to fix the tube 10. Also tube 10
The mandrel part 14 of the expansion die 13 is inserted into the inside of the expansion die 13.

The expansion die 13 is provided with an expansion part 15 that is expanded in a tapered shape from the core metal part 14, and the inclination angle 0 of the expansion part 15 is 45 degrees. Further, the outer diameter of the metal core portion 14 is set to D2, which is slightly smaller than the inner diameter D1 of the tube 10.

When the mandrel part 14 is inserted into the inside of the tube 10 and the front end of the expanding part 15 and the tube end come into contact with each other as shown in FIG. 5, the expanding die 13 is then moved in the direction of arrow B. Moved and pushed forward. The moving distance of the expanding die 13 is set to T1, and as a result, the straight pipe end is expanded with the inner surface facing outward as shown in FIG.

When the tube end of the tube 10 is expanded into a tapered shape at an angle of 45 degrees, the expansion die 13 is pulled out in the direction of arrow C [see Fig. 7]. Instead, the mandrel a of the bending die 16 is placed inside the tube 10. 117 is inserted [Fig. The bending die 16 is provided with a bending surface 418 that stands radially from the core 17. That is, the curved surface portion 18 is aligned in the tube axis direction [direction of arrow A].
and is continuous at an angle of 90 degrees to the circumference of the mandrel 17 having an outer diameter D2. Core metal part 17
is inserted into the inside of the tube 10, and as shown in FIG.
The moving distance of the bending die 16 is set to T1, which is the same as the water length of the tapered part, and as a result, the flange part 11 is formed at the tapered tube end with the flange surface facing outward as shown in FIG. It will be done.

In the above order, tube end flange portions 11 which are expanded outward in a plane perpendicular to the tube axis direction [direction of arrow A] are formed at both ends of the tube 10, respectively. A conduit is formed by connecting a plurality of pipes 10.

To connect the 6 pipes 10A and IOB formed in the above order 1111, first, as shown in FIG. This is carried out with the end of the pipe 10B inserted into the cylindrical connection part 21B of the first fastening body 20. That is, the female threaded fastener 20 is an annular body having a T-shaped longitudinal section, and is inserted between the two cylindrical connecting portions 21A and 21B having the cylindrical connecting portions 21A and 21B at both ends, respectively. Both pipes 10A, 10
A shape that locks onto the outer periphery of the flange portion 11 of B! 5, a seal member holding portion 23 is formed between the opposing flange surfaces 22. An annular seal member 24 is bonded and held in the seal member holding portion 23 at a position facing the flange surface 22 of the container tube 10A and IOB. The inner diameter D3 of each cylindrical connection part 21A, 21B is
The outer diameter D4 of the flange portion 11 is slightly larger than the outer diameter D4 of the flange portion 11. That is, as shown in FIG. 3, each cylindrical connecting portion 21A, 21B is formed to extend from the outer peripheral portion of the seal member holding portion 23 to the outside of the tube end flange portion 11 in both tube axial directions [direction A]. Ru. Further, among the cylindrical connecting portions 21A and 21B, a female threaded portion 25A is formed on the inner circumferential portion of the cylindrical connecting portion 21A, and a female threaded portion 25B is formed on the inner circumferential portion of the cylindrical connecting portion 21B. Each female threaded portion 25A, 25B is also formed to extend in the axial direction [direction A] of both tubes. In the female threaded fastening body 20 having such a configuration, when the tube 10A is inserted into the cylindrical connection body 21A and the tube 10B is inserted into the cylindrical connection portion 21B as shown in FIG. 3, the container tube 10A, The flange surface 22 of the IOB and the outer peripheral side of the flange portion 11 are respectively crimped to the seal member 24.

As shown in FIG.
When the tube end portion B is inserted, the pair of tubes 10A and IOB are temporarily held with their tube end flange portions 11 abutting each other. In this state, next, attach the threaded fastener 2 to the cylindrical connection part 21A.
6A is also a threaded fastener 26B on the cylindrical connection body 21B.
is inserted. Each of the male threaded fasteners 26A and 26B is composed of half annular bodies 27a and 27b that are divided into two in the circumferential direction (direction F in FIG. 282). That is, each of the male threaded fasteners 26A and 26B is attached to the outer periphery of the tube 10A and IOB, whose tube ends abut each other in the direction of arrow G, with each of the half annular bodies 27a and 27b being combined. [See FIG. 4] The 0-merging is performed by moving each half annular body 27a, 27b from the outside in the tube radial direction in the direction of arrow J. On this occasion,
A connection plug 28 and a connection hole 29 are formed in each of the half annular bodies 27a and 27b, respectively, as shown in FIG. 5, and the two are joined together by inserting the connection plug 28 into the connection hole 29. Among the male threaded fasteners 26A and 26B formed by combining the half annular bodies 27a and 27b, the male threaded fastener 26A has a male thread portion 30A. Further, a male threaded portion 30B is formed in the male threaded fastener 26B. Each male thread part 30A, 30B has a shape in which each half annular body 27a, 27b is combined! E in the circumferential direction [continuous in the downward direction A in Figure 2].

Each male threaded fastener 26A, 26B has a pressing portion 31 at the tip.
Connect the fastener 26A to the pipe 10A and the fastener 2 to the pipe 10A with the
6B is sheathed in tube 10B. A pair of male threaded fasteners 2
When 6A and 26B are respectively attached to the corresponding pipes 10A and IOB, the male threaded portion 30 of the male threaded fastener 26A is
A and the female threaded portion 25A of the female threaded fastener 20, and the male threaded portion 30B of the male threaded fastener 26B and the female threaded portion 25B of the female threaded fastener 20 are screwed together, respectively. In this state, each of the male threaded fasteners 26A, 26B is moved in the pipe abutment direction [G
direction], and the tip of the male threaded fastener 26A is screwed into the cylindrical connection part 21A, and the tip of the male threaded fastener 26B is screwed into the cylindrical joint 'a' part 21B. . As a result, the pressing portion 31 of each male threaded fastener 26A, 26B
are moved in the direction of tube abutment (direction G), thereby suppressing the flange portions 11 of the corresponding tubes 10A and IOH in the direction of arrow G [see FIG. 1].

When the flange portions 11 of the container tubes 10A and IOH are pressed in this manner, the flange surfaces 22 of the flange portions 11 are pressed against the sealing member 24, and the ends of both tubes 10A and IOB are tightly connected. The Rukoto. In this way, according to the pipe connection structure according to the present embodiment, the containers 1OA and IOB which are temporarily held by the connection member 18 are connected to each other with a pair of male threads, the fasteners 26A and 26B with female threads, and the fasteners 20 and 20 with female threads. It becomes possible to connect them together by screwing them together.

Next, the operation of the above embodiment will be explained.

According to the pipe connection structure according to the above embodiment, the six pipes 10A, I
Since the flange portions 11 of the OH are expanded outward in a plane substantially perpendicular to the tube axis, the flange portions 11 of the OH are held by the seal member holding portions 23 between the abutting flange portions 11. Both pipes 10A and IOH can be connected with the seal member 24 interposed therebetween. As a result, the length of connection between each tube end (see FIG. 1) becomes small, making it possible to provide a compact tube connection structure.

In addition, the male threaded portion 30A of the male threaded fastener 26A, the female threaded portion 25A of the female threaded fastener 20, and the male threaded fastener 26
Male thread part 30B of B and female thread part 2 of the female threaded fastener 20
The pressing force in the tube drawing direction [G direction] generated by the screwing of the screws 5B and 5B is caused by the pressing portions 31 of the respective male threaded fasteners 26A and 26B.

A, acts on the flange portion 11 of IOB. At this time, since the flange portion 11 is approximately perpendicular to the tube axis, the pressing force is applied to the entire flange portion 11, and each flange portion 11
In this case, a strong connection strength is applied to resist the tensile force in the direction indicated by the arrow (see FIG. 1) acting in the direction of the tube axis at the connection portion.

Further, the seal member 24 is adhered to and held on both sides of the seal member holding portion 23 of the female threaded fastener 20, and becomes locked to the outer circumferential portion of each tube end flange portion 11. Therefore, the sealing member 24 is always reliably positioned at a position facing the flange portion 11 of the six pipes 10A and IOH, and a reliable crimped state with the flange portion 11 can be obtained.

Thereby, it is possible to improve the sealing performance at the connection between the six pipes 10A and IOH.

Further, according to the above tube connection structure, the six tubes 10A and 10B are positioned to be inserted into the corresponding cylindrical connection portions 21A and 21B as shown in FIG. 3 at an intermediate stage of the connection operation. Therefore, each tube end is always abutted in an optimal connection state, and this state can be temporarily maintained in the intermediate assembled state shown in FIG. As a result, the subsequent screwing work of the male threaded fasteners 26A and 26B can be performed stably in the above-mentioned temporary holding state, and unlike the conventional method, special means for temporary holding is not required. It becomes possible to easily complete the connection work without using any operations.

Furthermore, in the above connection work, each male threaded fastener 26
A and 26B are divided into two sections according to the ability to be attached to the tube end from the tube radial direction. As a result, there is no need to sheath the threaded fastener 26A on the pipe 10A and the threaded fastener 26B on the pipe 10B before forming the flange portion 11 at the end of the pipe. Connection workability can be improved.

[Effects of the Invention] As described above, the present invention provides tube end flange portions that expand outward in a plane substantially orthogonal to the tube axis for each tube end portion of a pair of tubes, and both tube end flange portions. It is a pipe connection structure in which a sealing member is crimped between the irQ cap end flange portion, and is secured to the outer periphery of the irQ cap end flange! At Sanno,
9. A sealing member holding portion interposed between opposing flange surfaces i of both pipe end flange portions, holding a sealing member crimped between each flange surface on both sides of the sealing member holding portion,
a female threaded fastener comprising a cylindrical connection part extending from the outer periphery of the seal member holding part to the outside of the pipe end flange part in both pipe directions, and each cylindrical connection part having a threaded part; It is divided in the circumferential direction so that it can be attached to the pipe end from the pipe radial direction, and is inserted into the inner surface of the cylindrical connection part provided in the female threaded fastener in a state where it is combined, and the female thread part of the cylindrical connection part and A pair of male threaded fasteners are provided, each having a male threaded portion that is screwed together, and a pressing portion that contacts the tube end flange portion at the tip portion that is screwed into the cylindrical connection portion, thereby making the structure more compact. , it is possible to improve the connection strength and sealing performance of the six pipes, and to improve the workability of connecting the six pipes.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a pipe connection structure according to an embodiment of the first embodiment, FIG. 2UA is a view taken along the line II-II in FIG. 1, and FIG. 4 is a cross-sectional view showing the state in which the pipe ends are inserted into the respective connecting parts, FIG. 4 is a view taken along the arrows similar to FIG. A shoulder view showing the main parts of the male threaded fastener attached to the pipe, and FIGS. 6 to 9 are cross-sectional views showing the process of forming the pipe end flange. 10. 10A, IOB... Pipe, 11... Flange portion, 20... Female threaded fastener, 21A, 21B... Cylindrical connection portion, 22... Flange surface, 23... Seal member holding part,
24... Seal member, 25A, 25B... Female threaded portion, 26A, 26B... Male threaded fastener. 3OA, 30B...Male thread part, 31...Press part. Agent Patent Attorney Osamu Shiokawa 1 Figure 2 Figure 3 Figure 6 Figure 7 One! ! 8 sides Figure 9

Claims (1)

[Claims] (1) A tube connection structure in which each tube end of a pair of tubes has a tube end flange portion that expands outward in a plane substantially perpendicular to the tube axis, and a sealing member is crimped between both tube end flange portions. A seal member holding portion is provided between opposing flange surfaces of both pipe end flanges in a state where the seal member holding portion is locked to the outer circumferential portion of both pipe end flanges, and a seal member holding portion is provided on both sides of the seal member holding portion. It holds a seal member that is crimped between each flange surface, and has a cylindrical connection part that extends from the outer periphery of the seal member holding part to the outside of the pipe end flange part in both pipe axial directions, and each cylindrical connection part has a female thread. A female threaded fastener is provided with a female threaded fastener that is divided in the circumferential direction so that it can be attached to each pipe end from the pipe radial direction, and that is attached to the inner surface of a cylindrical connecting part provided on the female threaded fastener when combined. A pair of male threaded fasteners, which are inserted and have a male threaded part that screws together with the female threaded part of the cylindrical connection part, and have a pressing part that comes into contact with the tube end flange part at the tip part that is screwed into the cylindrical connection part. A pipe connection structure comprising a body and a body.