JP3278131B2 - Corner piece used for square duct - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a flange provided on an end face of a square duct and a corner piece to be attached to four corners of the flange, and reliably seals a joint surface between the ducts with a simple structure. It relates to technology that can be used.

[0002]

Conventionally, the structure of a square duct is well known. For example, as shown in FIG. The flange 2 is formed by bending outward. When the duct bodies 1 are connected to each other, the flanges 2 of the two duct bodies 1 and 1 face each other, and a corner piece is attached to a corner cut 3 formed between adjacent flanges. This is a structure in which the corner pieces are bent and crimped, and the facing corner pieces are fixed with bolts. Reference numeral 4 denotes a bead formed by bending, crimping, or the like.

As a known configuration of a corner piece, as shown in FIG. 2, a bolt hole 6 is provided at a corner of an L-shaped piece main body 5, and a corner presser is provided inside the L-shaped bent portion. Projecting portion 7 is provided in the vertical direction. When the corner piece is mounted, a sealant is applied and the corner piece is mounted between the bead 4 and the flange 2 so that gas passing through the duct does not leak from the corner of the flange, and the outer periphery of the flange is bent. Was to stop caulking.

[0004] However, since this sealing operation needs to be performed on site, there is a problem that the operation is extremely troublesome, and at the same time, the hands are soiled by a highly adhesive sealing agent, and the workability is reduced. In addition, since the duct equipment is installed in a narrow place, there is a problem that work accuracy is low and a complete sealing effect is hardly expected depending on the site.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems. By providing a packing corresponding to a corner piece in advance, the workability can be improved. Another object of the present invention is to provide a structure capable of performing highly accurate sealing.

In order to solve the above-mentioned problem, in the present invention, an L-shaped cooper to be caulked at four corners of a flange of a square duct.
Adopt a horn piece. And this corner piece
Has a recess in the plane on the flange side and an L-shape.
A projection corresponding to the end of the square duct is provided inside the
Easily bendable sheet-shaped packing is provided in the recess
At the same time, further projecting toward the inside of the L-shape,
Having a tongue sandwiched between the duct and the protrusion
Means were used.

The corner piece joins the flange surfaces of two square ducts, and a sheet-like packing is mounted on the flange side surface in advance, so that the bead or the flange is formed only by joining the corner pieces. It is configured so that the surrounding sealing work can be completed. The protrusion provided on the corner piece has a shape corresponding to the cut at the end of the square duct, and gasket is leaked from this part by inserting packing between this end and the protrusion. To prevent. In addition, by applying packing to the concave portion provided in the flat portion, the flanges to be joined are also elastically pressed to each other, thereby reliably avoiding gas leakage.

[0008]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. The present invention is applied to the square duct shown in FIG. 3 is a cross-section taken along line AA of the corner piece, FIG. 5 is a cross-section taken along line BB of the corner piece, 10 is an L-shaped corner piece body, and 11 is provided at a corner. Bolt holes,
Reference numeral 12 denotes a protrusion, and these basic configurations are the same as those of the conventional corner piece. Reference numeral 13 denotes a concave portion provided in the flat portion of the corner piece main body 10.

Next, FIG. 6 shows a packing 1 used in the present invention.
4 and is made of a material which is flat and can be easily bent. In the figure, reference numeral 15 denotes a tongue having a shape corresponding to the protruding portion 12 of the corner piece main body 10, and reference numerals 16 and 16 denote sticking portions each having a shape corresponding to the recess 13. An adhesive layer for the corner piece body 10 is formed on the back surface of the packing 14.

Here, FIG. 7 shows a state where the packing 14 is previously attached to a position corresponding to the concave portion 13 of the corner piece main body 10. In the present embodiment, the packing 14 uses a plate-like urethane foam, but in addition, soft rubber or pre-molded material may be used as long as it is a material generally used to avoid leakage of internal gas in a duct or a wind tunnel. Needless to say, semi-rigid synthetic resin can be widely used. And the packing 14 is the corner piece body 1
If it is attached to the corner of the square duct with it attached to 0,
The tongue 15 is sandwiched between the corner of the duct and the protruding portion 12, and the most leaky portion is securely sealed. At the same time, the sticking portions 16, 16 are sandwiched between the corner piece bodies,
Leakage in the plane direction can also be avoided.

In the present embodiment, the packing 14 is cut out in the shape shown in advance, but what is important as a shape is that the tongue 1 capable of sufficiently covering the protrusion 12.
It is needless to say that the presence of No. 5 and that the sticking portion 16 matches the concave portion 13 of the corner piece main body 10 are not limited to the illustrated shape. In the present embodiment, the packing 14 is fixed to the corner piece body 10 by the adhesive layer. However, the packing 14 may be partially fixed with the eye, or as shown in FIG.
The knob 17 protruding from the back surface of the corner piece 4 may be fixed by being inserted into a small hole 18 formed at an appropriate position of the corner piece main body 10. In any case, it is sufficient that the packing 14 can be temporarily fixed to the corner piece main body 10.

In the above embodiment, the packing is formed in advance. However, it is also within the scope of the present invention to cut and form a sheet-like packing material on site.

[0013]

According to the present invention, instead of applying a liquid sealing agent at the time of joining the square duct, a preformed packing is attached to the corner piece main body, or the packing is cut off and attached at the site. As a result, a reliable sealing effect can be expected, and at the same time, it is completely released from the contamination of the hands due to the application of the sealing agent, so that the workability can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the structure of a square duct.

FIG. 2 is a perspective view of a conventional corner piece.

FIG. 3 is a perspective view of a corner piece of the present invention.

FIG. 4 is a sectional view taken along line AA in FIG. 3;

FIG. 5 is a sectional view taken along line BB in FIG. 3;

FIG. 6 is a perspective view of a packing.

FIG. 7 is a perspective view showing a state in which packing is attached to a corner piece.

FIG. 8 is a cross-sectional view showing another embodiment for attaching the packing to the corner piece.

[Description of Signs] 10 Corner piece main body 11 Bolt hole 12 Projecting part 13 Concave part 14 Packing 15 Tongue 16 Sticking part 17 Knob 18 Small hole

Continuation of the front page (56) References JP-A-56-86285 (JP, A) JP-A-50-103713 (JP, A) JP-A-6-331079 (JP, A) JP-A-5-32941 (JP) , U) Japanese Utility Model Hei 5-32940 (JP, U) Japanese Utility Model Hei 7-43227 (JP, U) Japanese Utility Model Showa 62-50448 (JP, U) Japanese Utility Model Hei 6-41077 (JP, Y2) Japanese Utility Model 7-31033 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16L 23/02 F24F 13/02

Claims (1)

(57) [Claims] 1. An L-shaped corner piece which is caulked at four corners of a flange of a square duct, wherein the corner piece has a recess in a plane on the flange side and an end of the square duct inside the L shape. And a sheet-like packing that can be easily bent at a position corresponding to the concave portion , and the packing further includes the L
A corner piece used for a square duct, characterized by having a tongue protruding toward the inside of the character and being sandwiched between the square duct and the protrusion.