JPH0353117Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a connecting end that allows easy connection of composite flexible tubes that are highly flexible and have excellent corrosion resistance and chemical resistance. be.

[Conventional technology]

Conventional flexible tubes using corrugated tubes include ones in which a metal wire is wrapped around the outer troughs of a resin corrugated tube for reinforcement, and as shown in Figure 5A, a resin tube is wrapped around the inner circumferential surface of a corrugated metal tube. There are those in which a pipe 9 is fitted, and there are also those in which the inner circumferential surface of a metal corrugated tube is coated with resin 10 as shown in FIG.

[The problem that the idea aims to solve]

However, in the case of using a resin corrugated tube, it takes a lot of effort to wind the wire around the outer trough, and there are still problems in terms of strength. Those in which resin pipes are inserted have the disadvantage of being inferior in flexibility and prone to bending. Furthermore, with resin coating, it is difficult to uniformly coat objects with continuous uneven inner peripheral surfaces, and pinholes are likely to occur.
It has the disadvantage of being unreliable.

In view of this, the present invention aims to fit a resin corrugated tube along the inner peripheral surface of a metal corrugated tube so that an extremely flexible composite flexible tube can be easily and reliably connected to a fitting. purpose.

[Means to solve the problem]

The present invention was made to achieve the above object, and consists of a corrugated metal tube on the outside and a corrugated tube made of a resin tube on the inside. In a composite flexible tube that is closely fitted to the circumferential shape, a split ring is fitted and locked into the valley on the outer periphery of the end of the composite flexible tube, and this split ring is fitted into the groove of the flange. In addition, the end of the composite flexible tube is flattened, and is placed along the side surface of the flange, and a packing is inserted between the inner and outer corrugated tubes at the flat portion of the tube end.

〔Example〕

The connecting end of the flexible tube of the present invention will be explained below based on the illustrated embodiment.

In the figure, reference numeral 1 denotes a corrugated metal tube whose diameter, plate thickness, wave shape, length, etc. are determined depending on the application, and the material used is steel, aluminum, stainless steel, or other alloys.

Reference numeral 2 denotes a corrugated tube made of synthetic resin, which is fitted into the corrugated metal tube 1 and arranged tightly along the uneven shape of the inner circumference of the corrugated tube 1. This involves inserting a synthetic resin tube into a metal corrugated tube and then molding the tube into a corrugated shape.
The two parts are not bonded or joined, but are in contact with each other. Therefore, when used as a flexible tube, when the flexible tube is bent, the corrugated tubes 1 and 2 slide against each other at the contact surfaces, and each corrugated tube is bent individually, resulting in loss of flexibility. Never.

This metal corrugated tube 1 may have a waveform at a constant pitch over the entire length of the flexible tube, or may have a straight tube shape at the end, but in either case, the inside of this metal corrugated tube 1 is A resin corrugated tube 2 is fitted and disposed on the circumferential surface so as to be in close contact with the shape of the tube. For example, in the embodiments shown in FIGS. 1 and 2, the waveform is formed up to the end of the flexible tube, and the third
In the embodiment shown in FIGS. 4 and 4, the tube end is shaped like a straight tube.

Next, a method of attaching a joint fitting 5 such as a flange to an end of a composite flexible tube in which a resin tube 2 is inserted into a metal corrugated tube 1 will be explained.

FIG. 1 shows a metal corrugated tube 1 with a resin corrugated tube 2 inserted into its inner layer, with the end portion being flat and expanding outward. A packing 3 in the form of a flat plate washer is interposed between the flat end 21 of the corrugated pipe 2, and a split ring 4 is fitted into the outermost trough of the corrugated pipe 1. Insert the tube end into the body of flange 5.

A hole 51 suitable for fitting the composite flexible tube is bored in the center of the flange 5, and a groove 52 into which the split ring 4 is fitted is formed in a part of the hole 51 and on one side of the flange 5. be done.
Therefore, when the tube end is inserted into the flange 5, the split ring 4 is fitted into the groove, and the flat end 21 of the resin corrugated tube 2 is inserted into the hole 51 of the flange 5.
This end 21
The packing is inserted between the side surface of the flange, and the end of the corrugated metal tube. A retaining ring 6 is fitted around the outer periphery of the tube at the other end of the flange to prevent the tube from coming off the flange.

FIG. 2 shows the embodiment shown in FIG. 1, in which a blade 7 is further fitted around the outer periphery of the corrugated metal tube to reinforce the corrugated tube.

In addition, the tube end shown in FIGS. 3 and 4 has a straight tube shape, and a flanged stopper 8 is fitted to the outer periphery of the straight tube, and the flanged stopper 8 is connected to the flange 5 through the flanged stopper 8. Alternatively, this embodiment is fixed to another joint fitting 20, and the other configurations are the same as the embodiments shown in FIGS. 1 and 2.

[Effect of idea]

According to this invention, a metal corrugated tube is arranged around the outer periphery,
In this composite flexible tube in which resin corrugated tubes are closely connected without being joined along the inner peripheral surface shape of the metal corrugated tubes, a split ring fitted to the outer periphery of the connection part is fitted into the groove of the flange and attached. In addition, the end of the tube is flat, and a gasket is inserted between the two flat corrugated tubes, and this is attached to the side of the flange, so it can be easily and airtightly connected to other equipment via the flange. It has advantages such as being able to connect.

[Brief explanation of the drawing]

The drawings show the composite flexible tube of the present invention. Figure 1 is a cross-sectional view of the flexible tube end without a blade, Figures 3 and 4 are cross-sectional views of the flexible tube end forming a straight pipe, and Figures 5A and B. is a publicly known example diagram. 1 is a metal corrugated tube, 2 is a resin corrugated tube, 11,
21 is the end of the corrugated pipe, 3 is the packing, 4 is the split ring, 5 is the fitting, 6 is the retaining ring, and 7 is the blade.

Claims (1)

[Scope of utility model registration request] A composite flexible tube with a corrugated metal tube on the outside and a corrugated tube made of a resin tube on the inside, extending over the entire length of the corrugated metal tube and closely following the shape of its inner circumferential surface. A split ring is fitted and locked into the valley on the outer periphery of the end of this composite flexible tube, and this split ring is fitted into the groove of the flange, and the end of the composite flexible tube is flattened, and this is fixed to the groove of the flange. The connecting end of a composite flexible tube is formed by inserting a packing between the inner and outer corrugated tubes along the side surface and between the inner and outer corrugated tubes at the flat part of the tube end.