JPH0434311Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a flexible tube formed by spirally winding a long material.

[Conventional technology]

Figure 1 is a front view of the flexible tube, Figure 2
The figure is a side view thereof, and FIG. 8 is a sectional view of section A in FIG. 1 showing a conventional flexible tube. In the figure, 1 is a flexible tube, in which a long material 2 with an S-shaped cross section is wound spirally, and one end 3 in the width direction of the long material 2 is polymerized with the other end 4 of the next pitch. It is formed in such a manner that it forms a section 5.

Such a flexible tube 1 is used for the purpose of absorbing vibrations, positional deviations, etc. in the axial direction or radial direction of the tube 1, and is used to absorb gas such as gas,
It is used as a joint for pipes that transport liquids such as water and chemicals, or as a damper when filled with liquid.

[Problem that the invention attempts to solve]

However, unlike a flexible tube 1 in which an overhang is formed by bulge processing or the like, such a flexible tube 1 can be continuously and efficiently manufactured from one long piece of material, but the manufactured flexible tube 1 However, there was a problem in that the internal fluid leaked from the gaps in the long material 2.

This invention is intended to solve the above problems, and aims to provide a flexible tube that does not leak internal fluid and can be manufactured efficiently.

[Means for solving problems]

This invention consists of a tube body formed by winding a long material made of magnetic material in a spiral shape, and engaging one end of the long material in the width direction so as to overlap the other end of the next pitch. , and a flexible tube provided with a magnetic fluid that is interposed and sealed at the overlapping portion between one end of the elongated material in the width direction and the other end of the next pitch.

[Effect]

In the flexible tube of this invention, a long material is wound in a spiral shape, and one end of the long material in the width direction is engaged with the other end of the next pitch so as to overlap to form the tube body. It is formed by interposing a magnetic fluid at the overlapping portion of one end in the width direction of the elongated member of the tube body and the other end of the next pitch and sealing the same.

Since this flexible tube is manufactured by winding a long material, it can be manufactured continuously and efficiently. Furthermore, the manufactured flexible tube is sealed because the magnetic fluid is present in the polymerized portion, and leakage of the internal fluid is prevented. Since the elongated material is made of a magnetic material, the magnetic fluid is attracted and trapped in the overlapping portion by magnetic force, and the sealed state is maintained for a long period of time without movement or leakage. Further, since the flexible tube has a structure in which elongated members are engaged, displacement of the tube itself is not hindered, and leakage of magnetic fluid due to displacement is also prevented.

〔Example〕

This invention will be explained below based on the embodiments shown in the drawings. The front and side views of the flexible tube of this embodiment appear similar to FIGS. 1 and 2. FIG. 3 is a sectional view of section A of this embodiment, and the same reference numerals as in FIG. 8 indicate the same or corresponding parts.

The long material 2 is a strip material made of an elastic magnetic material such as an iron plate or some stainless steel plate, and is formed into an S-shaped cross section by roll forming or the like.
The tube body 6 is formed by spirally winding this to form a cylindrical shape. One end 3 in the width direction of the elongated material 2 forming the tube body 6 is engaged with the other end 4 of the next pitch so as to overlap and form an overlapping portion 5. In the overlapping part 5, between one end 3 and the other end 4 of the long material 2,
A retaining portion 7 is formed over the entire length of the long material 2,
A flexible tube 1 is formed such that a magnetic fluid 8 is injected therebetween. The magnetic fluid 8 is made by mixing fine powder of a magnet such as a cobalt-based alloy magnet with a fluid such as mineral oil, and may have heat resistance or chemical resistance depending on the usage environment of the flexible tube 1 or the type of fluid inside. Select the material of the magnet powder, such as one with high compatibility, and the fluid, such as mineral oil. Such magnetic fluid 8 is supplied and injected at the same time as the elongated material 2 is wound, or after the tube body 6 is formed, it is cut into a predetermined size and injected from the cut end.

The flexible tube 1 having the above structure is constructed by winding a long material 2 in a spiral shape, and engaging one end 3 of the long material 2 in the width direction with the other end 4 of the next pitch so as to overlap the tube body. 6 is formed, and a magnetic fluid 8 is interposed in the retaining part 7 of the overlapping part 5 of the one end 3 of the elongated material 2 in the width direction of the tube body 6 and the other end 4 of the next pitch to be sealed. It is formed by

Since the flexible tube 1 is manufactured by winding the elongated material 2, it can be manufactured continuously and efficiently. Furthermore, since the manufactured flexible tube 1 has the magnetic fluid 8 interposed in the overlapping portion 5, it is sealed without impairing its flexibility, and leakage of the internal fluid is prevented. Since the elongated member 2 is made of a magnetic material, the magnetic fluid 8 is trapped in the overlapping portion 5 in an adsorbed state, and a sealed state is maintained for a long period of time. Further, since the flexible tube 1 has a structure in which the elongated member 2 is engaged, the displacement of the tube 1 itself is not hindered, and the leakage of the magnetic fluid 8 due to displacement does not occur.

FIG. 4 is a front view of another embodiment, FIG. 5 is a side view thereof, FIG. 6 is a sectional view of section B, and FIG. 7 is a perspective view of a long material. In this embodiment, the elongated material 2 has two peaks 10 and 11 on both sides of one valley 9, and a flat part 12 is formed at the top of one of the peaks 11. This elongated material 2 is wound as shown by arrow C in Fig. 7, and the crest 10 at one end 3 in the width direction is engaged so as to overlap with the ridge 11 at the other end 4 of the next pitch. A magnetic fluid 8 is injected into a retaining portion 7 formed in the overlapping portion 5 and interposed therebetween.

In the above explanation, if at least one end of the elongated material 2 forming the overlapping portion 5 is magnetized,
Movement and leakage of the magnetic fluid 8 is further reduced. The magnetic material constituting the elongated material 2 is not limited to iron-based alloys, and may be other materials such as magnetic aluminum alloys.

[Effect of idea]

According to the present invention, since the elongated members are engaged and the magnetic fluid is interposed in the overlapping portion, the following effects can be obtained.

Since the magnetic fluid is used for sealing, fluid leakage can be prevented without sacrificing flexibility, and production can be performed with extremely high efficiency.

Even if the flexible tube is used vertically, horizontally, or diagonally, the magnetic fluid is attracted to the flexible tube body by magnetic force, so it does not move, and therefore it can be used in a wide range of applications.

Capillary action allows it to enter and seal even the smallest gaps.

Since it is a fluid, it can fit into irregularly shaped gaps.

[Brief explanation of drawings]

Fig. 1 is a front view showing an embodiment of this invention and a conventional flexible tube, Fig. 2 is a side view thereof, Fig. 3 is a sectional view of section A of the embodiment, and Fig. 4 is a front view of another embodiment. , FIG. 5 is a side view thereof, FIG. 6 is a sectional view of section B, FIG. 7 is a perspective view of a long material, and FIG. 8 is a sectional view of section A of FIG. 1 showing a conventional example. In each figure, the same reference numerals indicate the same or equivalent parts, 1 is a flexible tube, 2 is a long material, 3 is a flexible tube, and 3 is a flexible tube.
is one end, 4 is the other end, 5 is the overlapping part, 6 is the tube body, 7 is the retaining part, and 8 is the magnetic fluid.

Claims (1)

[Claims for Utility Model Registration] (1) A long material made of a magnetic material is wound in a spiral shape, and one end of the long material in the width direction overlaps with the other end of the next pitch. A flexible tube comprising a tube main body formed by the same method, and a magnetic fluid interposed and sealed at the overlapping portion of one end of a long material in the width direction and the other end of the next pitch. (2) The flexible tube according to claim 1, in which the polymerization part has a magnetic fluid retention part. (3) The flexible tube according to claim 1 or 2, wherein at least one end of the elongated material forming the overlapping portion is magnetized.