JP2008224125A - Integrated spiral duct - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an integrated spiral bent pipe reducible in man-hours to attain great improvement in productivity and also in quality because of no joint. <P>SOLUTION: This integrated spiral duct is characterized in that straight connecting pipes are arranged at both ends of a bent pipe and that the bent pipe and the straight connecting pipes are integrally formed of a metal band into spiral shape with no joint at an intermediate part. Since the seamless duct is manufactured continuously wound from the metal band, there are advantages of reducing the manufacturing man-hours to attain great improvement in productivity and also in quality and durability. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an integral spiral duct, and more particularly to a duct in which a straight connection pipe is disposed at both ends of a curved pipe and is molded in an integral spiral type.

Circular hollow ducts are frequently used for air conditioning or gas flow in general industrial fields and buildings.
In general, hollow ducts are often straight, but in narrow spaces or places with obstacles, it is necessary to change the installation direction through various curved pipes.

     A typical configuration of a hollow duct having such a curved shape is shown in FIGS.

In FIG. 1, a flat plate is first bent in a semicircular cross section, and is formed so as to have a predetermined radius of curvature as a whole. After forming a pair of an upper structure and a lower structure, they are joined to each other by welding or the like. The structure is shown.
However, in such a duct structure, the operation itself for forming the upper and lower portions of the semicircular cross section is very troublesome and difficult. In addition, it is very difficult to form parts (circumferential protrusions) for connecting to other hollow tubes at both ends of the duct. There was a disadvantage that it was difficult to connect with other hollow tubes.
FIG. 2 shows a configuration in which a large number of straight sections are joined together to form a curved pipe. In this method, the sections are molded in a state where they are separated from each other, and then a structure in which the hands are held together is formed into a bite-synthesizing form or connected by welding.
However, according to such a conventional technique, many man-hours are required to connect a large number of sections to each other, and the strength of the connecting portion is not ensured, so that the durability is greatly reduced. It was.
On the other hand, Patent Document 1 discloses a content in which a bent pipe is formed by continuously winding a metal strip having a specific shape. This configuration will be briefly described with reference to FIG.
First, a conventional bent pipe is made of a band-shaped metal plate in which large portions and narrow portions are alternately continuous and at the same time one end in the longitudinal direction is a straight line and the other end is a wavy curve. To do.
A double bent portion is formed at the straight peripheral portion of the metal plate, and a single bent portion is formed in an upright state over the entire length at the peripheral portion on the waveform curve side.
In addition, the band-shaped metal plate is wound in a spiral shape, and at the same time, a large portion is positioned on the outer curved portion of the peripheral surface and a small width portion is positioned on the inner curved portion, so that the adjacent single bent By firmly fitting the portions and the double bent portions in order and press-fixing them, a firm connection at the joints becomes possible.
Furthermore, the prior art discloses an example in which two band-shaped metal plates used as a curved pipe can be obtained from one metal band-shaped plate material.
However, such a conventional example does not disclose a configuration in which a curved pipe and a straight connection pipe are integrally coupled.
Therefore, conventionally, as shown in FIG. 4, the bent pipe and the straight connecting pipe are connected to each other by welding.
However, in this case, since the connection between the spiral bent pipe and the straight connecting pipe is performed by welding, there are disadvantages in that the man-hours are always large, the production is troublesome, and the joint is not smooth.
Korean Patent Publication No. 1990-17678 Specification

The present invention has been made in order to solve the above-described problems. The object of the present invention is to reduce man-hours, greatly increase productivity, and since there is no seam, the quality is also improved. The object is to provide an integral spiral duct that can be greatly improved.
Another object of the present invention is to provide an integral spiral duct that is manufactured integrally and thus has no seam, thereby greatly improving durability.

In order to achieve the above object, an integrated spiral duct according to the present invention has straight connecting pipes disposed at both ends of a curved pipe, and the curved pipe and the straight connecting pipe are seamlessly provided in the middle. It is integrally formed in a spiral shape.
Here, if the spiral is unfolded, both ends are configured with a band having a certain width, and the midway portion is formed with a periodic waveform on one side thereof, and the other side is formed flat. preferable.
And the convex ring part is each formed in the predetermined site | part of the said both straight connection pipe | tube for connection with another pipe | tube.
In addition, the nodes of each section constituting the spiral are hooked and then seamed.
Here, it is preferable that a section of each section constituting the spiral is formed in a “Z” shape, and a flange portion thereof constitutes a joint portion of the node.
Further, it is preferable that a double concave ring portion is formed outside the convex ring portion of the straight connection pipe, and an O-ring inserted into the concave ring portion is additionally provided. .

According to the present invention, since a seamless duct is manufactured by continuously winding from a metal strip, the number of manufacturing steps can be reduced, productivity can be greatly increased, and quality can be greatly improved. There is an advantage that can be made.
In addition, according to the present invention, since the duct is manufactured integrally, there is no seam in the middle, so the durability can be greatly improved.

  Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to FIGS.

As shown in the figure, the integral spiral duct according to the present embodiment has a structure in which straight connection pipes 200 are arranged at both ends of the curved pipe 100. Further, the curved pipe 100 and the straight connecting pipe 200 are both integrally formed in a spiral shape. The material of the duct is made of a material that can be easily molded and has durability such as tin iron or aluminum.
If the spiral duct is deployed, both ends are configured with a band having a certain width, and the midway part is formed with a periodic waveform on one side and the other side is formed with a flat straight line. Yes.
At this time, the nodes C of the sections S constituting the spiral are seamed together after being hook-coupled with each other.
Specifically, the cross section of each section S constituting the spiral is formed in a substantially “Z” shape, and the flange portion thereof constitutes the joint portion of the node C. By being pressed at the node C by the seam processing, it is possible to achieve a firm mutual connection. Thereby, in the duct of this embodiment, the welded site | part cannot be searched.
Next, when the integrated spiral duct according to the present embodiment is viewed as a whole, the nodes between the sections constituting the spiral are formed in a convex shape by forming a connecting portion.
On the other hand, as shown in FIG. 9, convex ring portions 210 are respectively formed in predetermined portions of both straight connection pipes 200 for connection to other pipes. For this reason, it is necessary to form a long convex portion in the longitudinal direction in a band having a constant width constituting the straight connecting pipe 200 in the developed view.
In addition, double concave ring portions 250 a and 250 b are formed outside the convex ring portion 210 of the straight connecting pipe 200. The double concave ring portions 250a and 250b have different depths, and the outer side 250b is formed deeper than the inner side 250a.
In this case, when another straight pipe 700 is coupled to the straight connection pipe 200, the O-ring 260 is first inserted into the deep outer concave ring portion 250b. The O-ring 260 moves to the inner shallow concave ring portion 250a while rotating, and is inserted so as to be in close contact with the inner shallow concave ring portion 250a.
Next, a method for manufacturing the spiral duct will be described with reference to FIG.

First, a long metal strip 300 having a constant width is prepared.
Then, the metal strip is passed through a stage on which many pairs of forming rolls 400 are arranged.
First, both sides of the metal strip are bent and formed by the forming roll 400 so that the locking groove 310 is formed slightly downward.
Next, the center of the width of the metal strip 300 is cut in the longitudinal direction by a cutting roll. In this case, in the middle of the strip 300, the arrangement angle of the cutter is continuously changed to form the metal strip 300 so that the narrow portion and the large portion are alternately repeated, and a uniform width is formed at both ends. To be.
Then, the side surface of each metal band separated from the center of the width of the metal band 300 is bent in the opposite direction to the locking groove 310 to form a locking ring 320. As a result, a substantially “Z” -shaped cross section is formed.
That is, in one cross section of the two metal bands 300 cut at the center of the width, one side surface has a form in which the locking groove 310 is formed while being bent downward, and the opposite side surface is A locking ring 320 that is bent to the opposite side so as to be locked in the locking groove 310 is formed.
Next, the metal strip is continuously wound up from a seaming machine to complete a rigid duct.

It is a perspective view which shows an example of the conventional duct. It is a perspective view which shows the other example of the conventional duct. It is a perspective view which shows the example of the conventional curved pipe. It is a perspective view which shows the other example of the conventional duct. It is a perspective view showing one embodiment of a curved pipe concerning the present invention. It is a fragmentary perspective view which shows the part couple | bonded using FIG. It is a top view which shows the expanded view of FIG. It is a schematic block diagram which shows the process of manufacturing the duct of FIG. It is a perspective view which shows other embodiment of the curved pipe which concerns on this invention.

Explanation of symbols

100 Curved pipe 200 Straight connecting pipe 210 Convex ring part 250a, 250b Concave ring part 300 Metal strip 310 Locking groove 320 Locking ring 400 Forming roll S Section C Node

Claims (6)

In ducts with straight connecting pipes at both ends of the curved pipe,
The integrated spiral duct, wherein the curved pipe and the straight connecting pipe are integrally formed in a spiral shape without a seam between them.   If the spiral is developed, both ends are constituted by a band having a certain width, and the midway part is formed with a periodic waveform on one side, and the other side is formed flat and linearly. The integral spiral duct according to claim 1.   2. The integral spiral duct according to claim 1, wherein convex ring portions are respectively formed in predetermined portions of the two straight connection pipes for connection with other pipes.   The integrated spiral duct according to any one of claims 1 to 3, wherein the nodes of each section constituting the spiral are hooked together and then seamed.   5. The integrated spiral duct according to claim 4, wherein a cross section of each section constituting the spiral is formed in a “Z” shape, and a flange portion thereof constitutes a joint of the nodes.   A double concave ring portion is formed outside the convex ring portion of the straight connecting pipe, and an O-ring to be inserted into the concave ring portion is additionally provided. The integral spiral duct according to claim 3.

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