JPS582953Y2 - Kinzokusei flexible tube - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a metal flexible tube used in piping systems for high-pressure gas, water vapor, or fluids such as water and oil.

Conventionally, flexible metal tubes have been used for high-pressure fluid piping to simplify piping work.

This metal flexible tube cannot withstand high pressure on its own (hereinafter referred to as the tube body), so a metal braid is coated around the tube body, which prevents the tube body from elongating due to high pressure and improves pressure resistance. It is held.

The tube body and the blade are usually welded to a connecting fitting provided at the end of the tube body.

However, welding the connecting fitting to the tube body and the blade requires considerable skill and effort, and in particular, there is a risk of fluid leakage if the tube body and the connecting fitting are not completely welded.

Furthermore, it is common knowledge that in metal flexible tubes coated with such blades, the blades are designed to withstand axial thrust buttons and other tensile loads caused by internal pressure, which may lead to blade breakage or blade fixation. No tensile load will be applied to the tube body unless it separates from the section.

That is, unless the button and blade are firmly fixed in the axial direction to the metal flexible tube, the effect cannot be fully achieved.

As a countermeasure for this, there is a proposal to connect a sleeve to the tip of the tube body, provide a groove in this sleeve, and clamp the blade in this groove via a ring (for example, as in Utility Model Publication No. 54-2416). However, since the socket and the sleeve have no relationship at all, even if the metal flexible tube is fixed with the screw of the socket, the sleeve will not be completely fixed in the axial direction.

Therefore, when a tensile load is applied to the flexible tube, the sleeve pushes out the corrugated end portion of the tube body, and if the magnitude of the load exceeds a limit, the corrugated portion may be deformed and the tube body may be damaged.

The present invention was made in view of the prior art, and the outline of the tank bottom is that the end of the flexible tube body 1 is made into a straight tube shape, and the straight tube portion 1a has two grooves 4a and 4b on the outer periphery.
The end of the blade 2, which covers the entire length of the outer periphery of the flexible tube body, is fitted into this sleeve 4, and a protrusion is formed on the inner surface of the outer surface of the plate. 5a is fitted, and the end of the blade 2 is firmly clamped between the protrusion 5a and one groove 4b of the sleeve, and the tip of the blade 2 is folded back outwards. By engaging the folded portion, the end face of the collar 5, and the end face of the socket 3 which is engaged with the sleeve by engaging the engaging collar 3a with the other groove 4a of the sleeve, the tube body and This invention relates to a metal flexible tube characterized in that both the blades are made to resist external forces that tend to be stretched by the cooperation of the sleeve and the socket.

The following will be explained based on examples.

Reference numeral 1 denotes a tube body formed into a desired shape, and the end of the tube body 1 is shaped like a straight tube, and the straight tube portion 1a of this body
After fitting the sleeve 4 to the outer periphery of the tube body, the end of the tube body is expanded into a trumpet shape along the sloped surface of the sleeve end surface,
Then, heat treatment is performed to integrate the sleeve and the tube body.

The outer periphery of this sleeve 4 has two annular grooves 4a that engage with the engaging collar 3a of the socket 3, and an annular groove 4b that engages an annular projection 5a protruding from the inner surface of the collar 5, which will be described later. Carve grooves in each.

The outer periphery of the tube body 1 is covered over its entire length with a blade 2, and after the end of the blade 2 is fitted to the outer periphery of the sleeve, a collar 5 is attached to the outside of the sleeve.
mate.

An annular protrusion 5a is provided on the inner surface of the collar 5 to engage with the groove 4b of the sleeve, and when the protrusion 5a of the collar engages with the groove 4b of the sleeve, it firmly clamps the blade as shown in the figure. It is something that connects.

The socket 3 that engages with the groove 4a of the sleeve is shaped like a cap nut and is integrally provided with an engaging flange 3a on the inner surface of one end. After the socket 3 is fitted into the sleeve, by applying pressure from an external force to the engagement flange of the socket, the engagement flange 3a is firmly fitted into the groove 4a of the sleeve to couple them together, or the socket can be freely rotated relative to the sleeve. The sleeve and socket are engaged in a moving manner.

Furthermore, at this time, the edge of the blade is held between the socket and the collar as shown in the figure to firmly support the blade.

In addition, when using this flexible tube, the socket 3 can be screwed into a connecting fitting provided directly at the end of the pipe, or it can be fitted with a handle for connecting to the mouthpiece of a cylinder, etc., as in the embodiment shown in Fig. 2A. The end of the connecting fitting 6 (or without the handle in Figure B) is screwed into the socket.

When this socket is connected directly or indirectly to a cylinder or other piping via the connecting fitting 6, etc., connect the straight pipe end of the flexible tube body, which is expanded like a trumpet on the sleeve end surface, to the cylinder's mouthpiece connecting fitting. 6 etc. and clamps it to prevent gas leakage.

According to the present invention, when a tensile load is applied to the flexible tube, the socket and the blade are related through the sleeve, and between the end face of the collar and the end face of the socket,
Since the bending portion of the tip of the blade to the external force is sandwiched between the blades, the shaped end portion is not pressed as in the above proposal, and therefore there is no risk of damaging the tube body.

Furthermore, the present invention has the advantage that the blade and tube body are connected to the socket and sleeve without welding, and that the axial resistance against external forces is extremely high, allowing for a reliable and firm connection. There is.

[Brief explanation of drawings]

Figure 1 is a front view with the left half cut away, Figure 2 A. B is an example diagram of a usage mode. 1...(Flexible) tube body, 2...
...Blade, 1a...Straight pipe section, 3...
...Socket, 3a... Tsukasa-kei Tsuba, 4...
・Sleeve, 4a, 4b...Groove, 5...
・Collar, 5a...protrusion.

Claims (1)

[Scope of utility model registration request] The end of the flexible tube body 1 is made into a straight tube shape, and a sleeve 4 having two grooves 4a and 4b on the outer periphery is fitted into the straight tube portion 1a to form an integral body. The end of the blade 2 coated over its entire length is fitted, and a collar 5 having a protrusion 5a protruding from the inner surface is fitted to the outer surface of the blade end, and this protrusion 5a and one groove 4b of the sleeve are fitted. At the same time, the end of the blade 2 is firmly clamped between the ends, and the tip of the blade 2 is folded back outward, and the engaging flange 3a is inserted between this folded part, the end face of the collar 5, and the other groove 4a of the sleeve. By being held between the end faces of the socket 3 which is engaged with and attached to the sleeve, both the tube body and the blade are made to resist external forces that tend to be stretched by the cooperation of the sleeve and the socket. Features a metal flexible tube.