JPH0520639B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a structure for connecting the ends of corrugated flexible gas pipes when piping them together.

[Prior art] Conventionally, when connecting corrugated flexible gas pipes, a connecting device and a connecting device that can be connected to the connecting device by screw connection, etc. are used, and the connection is made to the end of one gas pipe. The fitting was airtightly attached, and the connecting tool was airtightly attached to the end of the other gas pipe, thereby connecting the connecting tool and the connecting tool.

[Problems to be Solved by the Invention] In the above-mentioned conventional example, the connection must be made using a complicated structure of the connecting tool and the connected tool, so there is a problem that the cost of the members required for the connection is high. In addition, it is necessary to attach the connecting device and the connected device to the gas pipe in an airtight manner and also to connect the connecting device and the connected device, which poses a problem in that the connection requires time and effort.

[Means for Solving the Problems] In the flexible gas pipe connection structure of the present invention, when connecting corrugated flexible gas pipes 1, the end surfaces of a pair of gas pipes 1 are brought into contact with each other, and a pair of semiconductors 2a are connected. An inner ring body 2 consisting of a pair of gas pipes 1
The corrugated portion 3 provided on the inner surface of the inner ring body 2 and the corrugated portion 4 of the gas pipe 1 are engaged with each other, and a sealing material 5 is interposed between the corrugated portions 3 and 4. A tightening body 6 that tightens and holds the inner ring body 2 is fitted onto the outer periphery of the inner ring body 2, and a heat-shrinkable resin tube 9 is placed over the outer periphery of the connection part from the outer periphery of the tightening body 6. This is characterized in that the tube 9 is contracted and brought into close contact with the outer periphery of the connecting portion, and the problems of the conventional example are solved by configuring it as described above. In other words, by configuring as described above, a pair of gas pipes 1
The inner ring body 2 is fitted onto the outer surface of the end of the gas pipe 1 via the sealing material 5 with the end surfaces of the gas pipes in contact with each other, and the tightening body 6
It can be connected simply by fitting it on, and it can be easily connected without requiring any effort. It can also be connected with simple members such as the sealing material 5, the inner ring body 2, and the tightening body 6, and the cost required for connection is also reduced. It has become possible to make it cheaply.

[Example] The gas pipe 1 is a flexible pipe, and is formed by corrugating a metal pipe such as stainless steel. The gas pipe 1 may be a metal pipe whose outer surface is coated with a synthetic resin layer. When the gas pipes 1 are connected, the end surfaces of the pair of gas pipes 1 are brought into contact with each other. A sealing material 5 is attached to the outer surface of the end of the gas pipe 1 that connects these end surfaces. The sealing material 5 only needs to have sealing properties, but it is desirable that it has heat resistance and adhesive properties. That is, heat-resistant adhesives such as epoxy, phenol, polyimide, and polybenzimidazole adhesives are desirable. As shown in FIG. 6, the inner annular body 2 is formed of a pair of semiconductors 2a, and a wavy portion 3 having the same shape as the wavy portion 4 on the outer surface of the gas pipe 1 is provided on the inner periphery. The pair of half-ring bodies 2a of the inner ring body 2 are fitted across the end faces of the pair of gas pipes 1 via the sealing material 5, and the wavy portion 3 on the inner circumference of the inner ring body 2 is inserted into the sealing material 5. It is engaged with the corrugated part 3 on the outer surface of the gas pipe 1 through the . Figures 1 and 2
In the illustrated embodiment, the outer surface of the inner ring body 2 is tapered 7. In the embodiments shown in FIGS. 1 and 2, the clamping body 6 is a ring body, and a taper 8 parallel to the taper 7 is provided on the inner surface of the clamping body 6. This tightening body 6 is fitted onto the outer periphery of the inner ring body 2 and the tapers 7, 8 are formed.
The inner ring body 2 is tightened and held by slidingly contacting and press-fitting the inner ring body 2. In this way, Figures 1 and 2
As shown in the figure, a pair of gas pipes 1 are connected. After the connection is made in this manner, a heat-shrinkable resin tube 9 is placed over the connection portion as required, and heat is applied to shrink the resin tube 9 to bring them into close contact.

Further, FIG. 3 shows another embodiment, in which the tightening body 6
has a taper 8, but the outer surface of the inner ring body 2 is a flat surface. In this case as well, the inner ring body 2 is tightened and held by press-fitting the tightening body 6. FIG. 4 shows another embodiment, in which the clamping body 6 is made of a unidirectional shape memory alloy. This tightening body 6 is fitted onto the outer periphery of the inner ring body 2, and the inner diameter of the tightening body 6 is reduced by applying heat to the tightening body 6, thereby tightening the inner ring body 2. In the embodiment shown in FIG. 5, a shape memory alloy is also used for the clamping body 6, but flanges 10 are provided on the inner periphery of both ends of the clamping body 6.

[Effects of the Invention] Since the present invention is configured as described above, the end surfaces of the gas pipes are brought into contact with each other, a sealing material is applied between the ends of the gas pipes, and the inner ring body is attached from above the sealing material. A pair of gas pipes can be connected by fitting and holding the inner ring body with the tightening body, and the pair of gas pipes can be easily connected by the inner ring body with the sealing material and the tightening body. The connection can be easily made, and the parts required for the connection are simple and inexpensive. Furthermore, a heat-shrinkable resin tube is placed over the outer periphery of the connection part from the outer periphery of the tightening body, and the resin tube is shrunk to close the connection part. Since the resin tube is placed in close contact with the outer periphery of the connection part, it is possible to cover the outer periphery of the connection part with the resin tube, and the sealing performance can be further improved by covering the resin tube. be.

[Brief explanation of the drawing]

Fig. 1 is a half-sectional view of one embodiment of the present invention, Fig. 2 is a sectional view illustrating the main parts of the same, and Figs. 3, 4, and 5 are main parts of other embodiments of the same. FIG. 6 is a perspective view showing the inner ring body, in which 1 is a gas, 2 is an inner ring body, 2a is a semiconductor, and 3
4 is a wavy portion of the inner annular body, 4 is a wavy portion of the gas pipe, 5 is a sealing material, and 6 is a tightening body.

Claims (1)

[Claims] 1. When connecting corrugated flexible gas pipes, the end surfaces of a pair of gas pipes are brought into contact with each other,
An inner ring made of a pair of semiconductors is fitted over the end portions of a pair of gas pipes, and the wavy portion provided on the inner surface of the inner ring is engaged with the wavy portion of the gas pipe, and the wavy portion is inserted between the two wavy portions. A sealing material is interposed, a tightening body that tightens and holds the inner ring body is fitted on the outer periphery of the inner ring body, and a heat-shrinkable resin tube is placed over the outer periphery of the connection part from the outer periphery of the tightening body. A connection structure for a flexible gas pipe, characterized in that the flexible gas pipe is contracted and brought into close contact with the outer periphery of the connection part.