JPH09144961A - Connecting device for metallic corrugated pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connecting device for a metallic corrugated pipe having large airtightness by interposing a lower nonferrous metallic sleeve, a metallic corrugated pipe, an upper nonferrous metallic sleeve, and a blade between a socket and a coupling fitting main body. SOLUTION: When the thick-walled parts 15 on both sides of a socket 13 are contracted by fastening, a lower copper sleeve 9, a metallic corrugated pipe 10, an upper copper sleeve 11 and a blade 12 interposed between a coupling fitting main body 5 and the socket 13 are compressed and extended together with the socket 13. Since both sides of these members are compressed by the contraction of the diameters of the thick-walled parts 15, 15 on both sides of the socket 13, the extended interposed objects press the thin and weak thin- walled part 14, and the whole is made into a circular arc shape and expanded outward together.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metallic corrugated pipe connecting device through which gas or liquid passes.

[0002]

2. Description of the Related Art A connecting device for corrugated metal pipes through which gas or liquid passes through has been conventionally known as an actual flat wire 1-1174.
Known by No. 89. However, since the connecting device uses an O-ring for keeping a hermetically sealed state, and the metal corrugated tube is simply pressed against the O-ring to keep airtightness, the airtightness is insufficient. In addition, there is a drawback that the type of fluid used and the temperature of the fluid are limited.

[0003]

SUMMARY OF THE INVENTION According to the present invention, when connecting a metallic corrugated pipe through which a gas or a liquid is passed, an O-ring is not used, and all are made of a metallic material to ensure airtightness. To get a large metal corrugated pipe connection device.

[0004]

According to the present invention, a non-ferrous metal sleeve, a metal corrugated pipe, a non-ferrous metal sleeve and a blade are sequentially fitted on a tubular fitting body, and a meat is formed on both sides thereof. It consists of a metal corrugated pipe connecting device that has a thick part and a thin part between them, and an annular protrusion is provided on the tubular fitting body, and the thick part on both sides of the socket The metal corrugated pipe connecting device is provided with an annular groove on its inner peripheral surface.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention are as follows. As shown in FIG. 1, the joint fitting 1 is formed of a flange 2, an annular groove 3 on the side thereof, an annular projection 4 and a joint fitting main body 5, straddles the annular projection 4 and a packing 6
A nut 17 is attached so as to sandwich.

On the other hand, a large number of annular spaces 7 are provided on the surface side of the fitting main body 5, and a large number of annular protrusions 8 are provided between the annular spaces. Then, the lower copper sleeve 9 is inserted into the metallic corrugated pipe 10, the metallic corrugated pipe 10 is inserted into the blade 12 into which the socket 13 described later is fitted, and the upper copper sleeve 11 is inserted into the blade 12 and the metallic corrugated pipe 10. , The socket 13 is set at a predetermined position, and the fitting main body 5 is inserted.

The socket 13 has a thin portion 14 formed by reducing the thickness of the middle portion thereof, and the thick portions 15, 1 are formed on both sides thereof.
5 is provided. Further, the thick portions 15, 15 of the socket 13
The annular grooves 16, 16 are formed on the inner peripheral surface of the. The blade 12 positioned around the upper copper sleeve 11 is the blade 12 wound on the metallic corrugated tube 10. Further, the positions of the annular grooves 16 and 16 provided on the inner circumference of the socket 13 do not coincide with the positions of the annular protrusion 8 provided on the outer circumference of the fitting main body 5.

When the thick portions 15, 15 of the socket 13 are tightened by using a tightening machine with the above structure, the diameter of the socket 13 is reduced. In other words, tighten the socket 1
When the thick portions 15, 15 on both sides of 3 are reduced in diameter, the lower copper sleeve 9, the metal corrugated tube 10, the upper copper sleeve 11, and the blade 12 interposed between the fitting main body 5 and the socket 13 The socket 13 is compressed and expands together, but both sides of these members are in a compressed state due to the reduced diameter of the thick portions 15, 15 on both sides of the socket 13, so that the expanded inclusions are The thin and weak thin portion 14 is pushed up from below, and as shown in FIG. 2, the whole becomes arcuate and bulges outward together.

Simultaneously with such behavior, the lower copper sleeve 9
Is not only crimped to the fitting main body 5 and integrated,
It is projected to an annular projection 8 provided around the joint fitting body 5, and they are further integrated. Thicker part 15,
The blade 12 in the annular grooves 16, 16 provided inside
Socket 13 and blade 12 are also integrated. As described above, the metal corrugated pipes can be connected while maintaining airtightness.

[0010]

Since the connecting device of the present invention is made of metal at all the places where the fluid comes into contact, the fluid to be used is much more applicable than the prior art and a reliable seal can be obtained. Especially in the gas body, there is no leakage due to permeation,
Also, the operating temperature range can be greatly expanded. In addition, by compressing the two parts of the socket, the lower non-ferrous metal sleeve, the metal corrugated pipe, the upper non-ferrous metal sleeve, the blade, etc., which are interposed between the socket and the fitting main body, are crimped and Since the extra lengths of the generated parts are bent while pressing the above-mentioned members as a whole by bulging the thin-walled portion of the socket,
The airtightness due to the pressure bonding can be further maintained.

Furthermore, a large number of annular projections 8 provided on the joint metal fitting body cause the lower copper sleeve to stick out over the entire circumference thereof, so that fluid leakage between the two is further eliminated, and moreover, it is provided on the inner surface of the socket. The blade enters the annular groove, the degree of adhesion between the two is increased, and similarly, fluid leakage can be completely prevented.

[Brief description of the drawings]

FIG. 1 is a partially sectional front view of a metallic corrugated pipe connecting device of the present invention.

FIG. 2 is a partial cross-sectional front view showing a state in which the metal corrugated pipe connecting device of the present invention is pressure-welded.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Joint fitting 5 Joint fitting main body 8 Annular protrusion 9 Lower copper sleeve 10 Metal corrugated tube 11 Upper copper sleeve 12 Blade 13 Socket 14 Socket thin wall portion 15 Socket thick portion 16 Annular groove

Claims (3)

[Claims] 1. A non-ferrous metal sleeve, a metal corrugated pipe, a non-ferrous metal sleeve and a blade are fitted on a tubular fitting body, and a thick portion is provided on both sides thereof, and a thin portion is provided therebetween. Connection device for metal corrugated pipe covered with socket provided with. 2. The metal corrugated pipe connecting device according to claim 1, wherein an annular projection is provided on the tubular fitting main body. 3. The metal corrugated pipe connecting device according to claim 1, wherein an annular groove is provided on the inner peripheral surfaces of the thick portions on both sides of the socket.