JPH109459A - Surface structure of angular duct - Google Patents

Abstract

PROBLEM TO BE SOLVED: To assure a sealing effect by caulking corner pieces to four corners of a flange of an angular duct and providing a sheet-like packing at a surface of a flange side of the corner pieces. SOLUTION: A pair of tongues 16 which corresponds to a projection 12 of a corner piece body 10 is formed as an attached part corresponding to a recess 13, and an adhesive layer corresponding to the corner piece body 10 is formed at a back surface of a packing 14 using a sheet-like polyurethane foam. In the state the packing 14 is previously attached to the position that corresponds to the recess 13 of the corner piece body 10, the corner piece body 10 is attached by caulking to four corners of a flange of an angular duct, and under a condition where a tongue 15 of the packing 14 is sandwiched between the corner of the duct and the projection 12 the leakage part is sealed. At the same time, each attached part 16 is sandwiched between the corner piece bodies 10 to avoid the leakage in the surface direction. Accordingly, a sealing effect can be assured.

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. Then, in connecting the duct bodies 1 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 opposing 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. It 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, according to the present invention, corner pieces are caulked at four corners of a flange of a square duct, and a sheet-like packing is provided on a surface of the corner piece on a flange side prior to caulking. The means of wearing was used. Further, a more specific structure of the corner piece is an L-shape, a protruding portion corresponding to the end of the square duct is provided inside the L-shape, and a concave portion is formed in the flat portion on the square duct side. Means were used. Further, the specific structure of the packing has at least a tongue portion corresponding to the protruding portion and a flat portion corresponding to the concave portion.

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, so that gas leakage is reliably avoided.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 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 that 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, if it is a material generally used to avoid leakage of internal gas in a duct, a wind tunnel, or the like, a soft rubber or a pre-molded material is used. 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.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Corner piece main body 11 Bolt hole 12 Projecting part 13 Concave part 14 Packing 15 Tongue 16 Adhering part 17 Knob 18 Small hole

Claims (3)

[Claims] 1. A surface structure of a square duct, wherein corner pieces are caulked at four corners of a flange of the square duct, and a sheet-like packing is provided on a surface of the corner piece on a flange side. 2. The corner piece has an L-shape.
2. The surface structure of a square duct according to claim 1, wherein a protruding portion corresponding to an end of the square duct is provided inside the character, and a concave portion is formed in a flat portion on the flange side. 3. The square duct surface structure according to claim 2, wherein the packing has at least a tongue portion corresponding to the projecting portion and a flat portion corresponding to the concave portion.