JPH0413548Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to duct pipes such as air conditioning ducts.

[Conventional technology]

A conventional duct pipe will be described with reference to FIG. 1 of the present invention. Reference numerals 1a and 1b are rectangular cylindrical duct pipe bodies, and 2a and 2b are flanges attached to the ends of the duct pipe body.

The flanges 2a and 2b consist of divided bodies 3 for each side of the duct pipe body, and a plate part 5 attached to the duct pipe main body is connected to the flange main plate part 4 in a bent manner, and adjacent to one end of the flange main plate part 4. Connection piece 7 fixed to the other end of the flange main plate of the split body with overlap bolts 6
are bent and coupled, but the connecting pieces can also be separate pieces.

Each divided body 3 of the flanges 2a and 2b is connected by a connecting piece 7 to form a rectangular frame shape which is fitted and fixed to the outside of the tube end of the duct tube body.

[Problem that the invention attempts to solve]

In the conventional duct pipe described above, as shown in FIG. 3, which shows an enlarged view of the main part, the pipe ends of the duct pipe body (a) and (b) are bent outward at right angles. C and D are the bent pipe ends. The reason is that the opposing flanges 2a and 2b
Tighten both flanges with a fitting between them,
The air flowing inside the duct is prevented from leaking from the opposing parts of both flanges, but if the flanges are installed without bending the pipe ends, the duct pipe body and the flange will be fixed by rivets (or spot welding). This is because a minute gap is created between the end of the duct pipe body and the plate portion 5 of the flange along the outer surface of this end, and air leaks from this part.
As described above, bending the end of the duct pipe body requires a complicated manufacturing process.

Furthermore, riveting or spot welding the flange to the duct pipe body has poor workability.

The purpose of this invention is to prevent air from leaking from the flange without bending the end of the duct pipe body outward.
Moreover, it is an object of the present invention to provide a duct pipe whose flange can be attached to a duct pipe body by simply fitting the flange to the duct pipe body without using riveting or welding.

[Means for solving problems]

In order to solve the above-mentioned problems of the duct pipe, this invention provides each divided body of the flange with an attachment member to be attached to the duct pipe body, and this attachment member has an L-shaped cross section that overlaps the inner side of the divided body. One plate part shall be fixed by overlapping welding to the flange main plate part of the divided body, and the other plate part shall have a free edge connected with a claw edge which is bent in the direction in which the one plate part is connected and along with the other plate part. A forced fitting portion for the pipe end of the main body is formed between the claw edge and a plate portion of the divided body that follows the duct pipe main body, and a retaining shape is provided on the claw edge at the tip of each side of the main body. The duct pipe has a protrusion formed on the inner surface that engages with the inner surface.

[Effect]

For each divided body of the flange, the mounting member to the duct pipe body is fixed by spot welding etc. only on the flange main plate side, and then each divided body is combined and fixed in a square frame shape, and then the flange is fixed. By forcibly fitting the pipe end of the duct pipe main body between the plate part to be attached to the duct pipe main body and the plate part of the mounting member on its inner surface, the embossment formed on the pipe end part to the inner surface side is formed. The protrusion passes through the inward claw edge portion of the mounting member plate, and the protrusion engages with the claw edge to prevent it from coming off (fitting in).

〔Example〕

In FIG. 1 and its enlarged main part in FIG.
has an L-shaped cross section that overlaps the inner surface of the divided body 3, while the plate portion 9 is overlapped and fixed to the flange main plate portion 4 of the divided body 3 by welding. In FIG. 1, reference numeral 10 indicates a spot welded portion where the one plate portion 9 is welded and fixed to the flange main plate portion 4.

The other plate portion 11 of the mounting member 8 has a free edge thereof,
facing the coupling direction of one plate part 9 and the other plate part 11
The pipe end of the duct pipe main body 1 is forcibly fitted between this claw border 12 and the plate portion 5 of the divided body 3 which is along the duct pipe main body 1. I am trying to get it.

In addition, at each side tube end of the duct tube main body 1, there is a protrusion 13 protruding toward the inner surface that engages with the claw edge 12 in a manner that prevents it from coming off.
A plurality of them are provided at intervals. 14 is Patsukin.

The illustrated duct pipe main body 1 is a rectangular tube in which each face plate body is fitted with a plate body on an adjacent face as an example. Reference numeral 15 denotes the seam fitting portion.

In addition, if the seam fitting part 15 reaches the end of the pipe in this way, it will be difficult to fit and install the flange.
In the figure, the length range where the flange is attached and the above-mentioned seam fitting portion have been cut away. 16 is a seam resection portion.

However, as described above, the flange can be mounted even if the fitting member 8 is made long enough so that both ends do not reach the fitting part.

Reference numeral 17 indicates a clip between the opposing flanges 2a and 2b.

〔effect〕

The duct pipe of this invention has the following effects.

(1) When attaching a flange to the duct pipe body, simply by fitting the end, it becomes irremovably fixed.

(2) There is no risk of air leakage at the fitting portion between the duct pipe body and the flange due to the above-mentioned fixed fixation that cannot be separated.

(3) The flange can be installed after the duct pipe body is assembled, and there is no need for the complexity of conventional spot welding.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view of an example of a duct pipe according to the present invention, Fig. 2 is an enlarged longitudinal sectional side view of the main part of the same,
FIG. 3 is a longitudinal sectional side view of the main parts of a conventional duct pipe. 1, 1a, 1b... duct pipe body, 2, 2a,
2b...Flange, 3...Divided body, 4...Flange main plate part, 5...Plate part, 6...Bolt, 7...Connection piece, 8...Mounting member, 9...One side member, 10...
...Spot welded part, 11...Other plate part, 12...
Nail edges.

Claims (1)

[Scope of utility model registration request] It consists of a rectangular cylindrical duct pipe body and a flange attached to the pipe end of the main body, and the flange is a divided body for each side of the duct pipe body, and a plate part attached to the main body is bent and connected to the main plate of the flange. In a duct pipe in which one end of the flange main plate part is bent and coupled with a connecting piece to be bolted to the other end of the flange main plate part of an adjacent split body, each split part of the flange has a connection piece that is attached to the duct pipe main body. Along with attaching the parts,
This mounting member has an L-shaped cross section that overlaps the inner surface of the divided body, and one plate part is fixed by overlapping welding to the flange main plate part of the divided body, and the other plate part has one plate part connected to the free edge. connecting a claw edge bent in the same direction and along the other plate part to form a forced fitting part for the tube end of the main body between the claw edge and a plate part of the divided body that runs along the duct pipe main body; A duct pipe characterized in that a protrusion protruding toward the inner surface is formed at the tip of each side of the main body to be engaged with the claw edge in a locking manner.