JPS5850154Y2 - metal foil flexible tube - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a flexible pipe mainly used for ventilation fan ducts in houses, apartments, stores, etc.

In this type of duct, the piping is routed around obstacles such as pillars, so in addition to durability and heat resistance, flexibility and shape retention are required, and since it is long, it is difficult to transport. In general, it is required to be easily portable.

In this respect, the present invention aims to improve the durability of the duct itself,
It is an object of the present invention to provide a metal foil flexible tube that has excellent heat resistance, has flexibility, stretchability, and shape retention that exhibits excellent effects during construction, and is also easily portable during transportation. .

An embodiment of the present invention will be explained based on the drawings. Fig. 1 shows a flexible tube made of metal foil, which is folded in half in the width direction, and
Inside the folded portion 1a, a band 1 made of metal foil such as aluminum foil, into which a hard wire 2 made of a hard material such as iron wire that is plastically deformable and has appropriate elasticity is inserted, is spirally wound to form an adjacent spiral band. It is made by bonding the bodies 1 together inside and outside in a state of overlapping.

In such a flexible tube made of metal foil, in the present invention, the band-shaped body 1 is constructed such that one of the opposing surface portions 1b and 1c protrudes for a long time, as shown in FIG. 2 and FIG. As shown in FIG. It is attached to the outer surface of the longer opposing surface portion 1b of the adjacent bright line strip 1 through the .

The above metal foil flexible tube is shown in Fig. 3A, with a flat strip 1 continuously unrolled from an aluminum foil roll and a folded portion 1a at the contact portion with a hard wire 2 unrolled from a similar roll. After folding the strip 1 in half, the adhesive 3 is applied only to the edge of the strip 1 opposite to the side where the hard wire 2 is present, using a roller placed beside the path of movement of the strip 1. 1 is spirally wound on a group of rollers having a spiral groove on the curved surface into which the hard wire 2 part is inserted and tilted at an equal angle with respect to the axis of the flexible tube to be manufactured. As shown in the figure, each hard wire 20 is bonded to an adjacent spiral strip 1, and then the overlapping portion of the strip 1 located between the two portions of each hard wire is squeezed inward in the radial direction of the tube.
The metal foil strip 1 located between the adjacent hard wire rods 2,
By deforming it into a state in which a large number of wrinkles are formed between the valleys between the two, the whole is bellows-shaped, and has continuous valleys and peaks having a substantially constant diameter in the circumferential direction. It is constructed in the state shown in Fig. 1, and the belt-shaped body 1
The hard wire 2 undergoes appropriate plastic deformation, and since many wrinkles are formed in the circumferential direction on the curves of the band-shaped body corresponding to the troughs, it can be stretched in the tube axis direction. It can also be held in a shortened state.

The width of the bi-folded strip 1 shown in the figure is set to about 2.5 times the helical pitch of the hard wire 2, but may be set appropriately as necessary.

As described above, the metal foil flexible tube according to the present invention has two folded highly plastic metal foil strips 1 with a relatively small-diameter hard wire 2 embedded in the folded proximal end side, which are stacked in a spiral manner. The metal foil strip 1 to be wound and laminated is bonded only at the edge opposite to the side where the hard wire 2 is present, and both the inner and outer bends are bonded to form a metal foil. The metal foil strip 1 located between the hard wire rods 2 is deformed inward in the tube radial direction, and the adjacent hard wire rods 2 are With a large number of wrinkles formed in the valleys between the wire rods 2, 2, the wire rods are bellows-shaped as a whole and have continuous valleys and peaks having a substantially constant diameter in the circumferential direction, so that each layer has a band-like shape. Since the sexual characteristic is that the body 1 can be held in an elongated state and a shortened state in the axial direction by plastic deformation, it has the following advantages. .

■ The metal foil strip 1 is attached to another strip 1 only at its end.
A flexible tube made of multi-layered metal strips 1 is formed by bonding with metal strips 1, and each of the metal strips 1 is laminated with most of the layers being independent.
Even if a crack occurs in the surface layer until the construction is completed, there is no risk that the crack will propagate to the internal layer, making it suitable as a flexible tube that can be used after being deformed into various shapes.

■Also, even if substantially the entire pipe wall is made thick, the metal foil strips 1 of each layer to be laminated are only bonded to other strips at their ends, and they can be used independently and freely. Since it can be plastically deformed, it can be easily formed into a bellows-like shape with regular peaks and valleys, resulting in an overall product with excellent stretchability and flexibility.

■ Since the flexibility of the entire pipe is based on the plastic deformation of the pipe wall, special measures are taken to maintain its shape even when the pipe is routed in a meandering manner by bypassing obstacles such as pillars. There is no need for special construction, and troublesome piping in narrow spaces can be easily installed by simply twisting the piping according to the situation, so it is both highly flexible and lightweight. This can dramatically improve the overall workability.

(2) Furthermore, due to its own plastic deformation, the band-shaped body 1 in each layer is configured to have many wrinkles in the circumferential direction from the top to the valley of the flexible tube, while having almost constant wrinkles in the circumferential direction. Since it has continuous troughs and peaks with a diameter, it is possible to easily expand and contract the entire or partial flexible tube by utilizing the wrinkles in the circumferential direction, which is limited to mere bending deformation. It is compact and easy to transport in large quantities or to the construction site.

Furthermore, before forming the tube into a bellows-like shape having a top and a trough, only the end of the strip 1 opposite to the side on which the hard wire 2 is located is bonded. The strips 1 are easily bonded to each other while easily coming into contact with each other at their edges, and there is no need to use a special suppressing device or the like for bonding, and a strong bond can be obtained.

As described above, we have obtained a metal foil flexible tube that has excellent durability and heat resistance as a whole, and is highly flexible, stretchable, and shape-retaining, and exhibits excellent effects during construction and transportation. .

[Brief explanation of drawings]

The drawings show an embodiment of the metal foil flexible tube according to the present invention, with Fig. 1 being a partially cutaway front view, Fig. 2 being an enlarged sectional view of the main part, and Fig. 3 showing the bonding process of A and O&M. FIG. 3 is a cross-sectional view of main parts. 1...Metal foil strip body, 2...Hard wire material.

Claims (1)

[Scope of utility model registration request] A two-fold highly flexible metal foil strip 1 with a relatively small-diameter hard wire 2 inside the folded proximal end is spirally laminated and wound, and the laminated metal foil strip 1 is Only at the end opposite to the side where the hard wire 2 is present, both the inner and outer ends of the bend are bonded to form a metal foil tube, and the tube is located between the hard wires 20. A large number of wrinkles are formed in the circumferential direction by deforming the metal foil strip 1 inward in the tube radial direction and extending from the top where each hard wire 2 is located to the valley between adjacent hard wires 2. In this state, the belt-shaped body 1 has continuous valleys and peaks that are bellows-shaped as a whole and have a substantially constant diameter in the circumferential direction, and is stretched and shortened in the tube axis direction by plastic deformation of the band 1 in each layer. A flexible tube made of metal foil, characterized in that it is configured to be able to be held in a fixed state.