JP7185280B2 - Duct with reinforcing ribs - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a duct for flowing temperature-controlled air, and more particularly to a reinforcing ribbed duct having reinforcing ribs extending in a direction substantially perpendicular to the direction of air flow.

A plurality of ducts are installed in a structure such as the ceiling of a building to form an air flow path and flow temperature-controlled air. In such a square duct with a square cross section, it is necessary to provide a reinforcing member extending in a direction substantially orthogonal to the air flow direction when the size is larger than a predetermined size or when the duct is used in a predetermined manner. Conventionally, when a reinforcing member is provided, the reinforcing member made of angle iron is attached to the side wall surface of the duct by spot welding or riveting.

However, attaching angle steel reinforcing members by spot welding or riveting requires material costs, labor, and time. There was a problem. For this reason, a duct is known that eliminates the need to attach a reinforcing member (see, for example, Non-Patent Document 1). In this duct, the central portion of each side wall is folded in two to protrude outward, and reinforcing ribs extending in a direction substantially perpendicular to the direction of flow are formed. The end portions of adjacent reinforcing ribs are covered and connected with connecting fittings.

JP 2007-147269 A

By the way, in the duct described in Patent Document 1, the connecting fittings are formed in a complicated shape so as to cover the ends of the adjacent reinforcing ribs. . Moreover, the connecting fittings had to be fixed to the wall plate (side wall) by spot welding, which required labor, time, and cost.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a duct with reinforcing ribs that has a simple structure and can be manufactured easily.

In order to achieve the above object, the invention according to claim 1 has four wall plates joined together to form a substantially square cylinder, air flows in the axial direction, and the central portion of each wall plate is folded in two. a reinforcing rib extending in a direction substantially perpendicular to the axial direction, and connecting fittings connecting the ends of the adjacent reinforcing ribs, wherein the connecting fittings are substantially L-shaped flat plates. , one end is bolted to one end of the reinforcing rib, the other end is bolted to the other end of the reinforcing rib , and the outer edge of the corner of the connecting fitting is formed in an arc shape, The duct with reinforcing ribs is characterized in that outer edges of the corners of the connecting fittings are formed to protrude beyond outer edges of the reinforcing ribs when both ends of the connecting fittings are bolted. .

According to the first aspect of the invention, since the reinforcing rib is formed by folding the central portion of each wall plate in two, there is no need to attach a reinforcing member made of angle steel by spot welding or riveting. In addition, it is possible to connect the ends of adjacent reinforcing ribs simply by bolting both ends of the connecting fittings to the ends of the adjacent reinforcing ribs. Therefore, it is possible to reduce labor, time and cost. In this way, the structure is simple and can be easily manufactured. In addition, since the connecting fitting is a substantially L-shaped flat plate and has a simple shape, it is easy to handle, store, and transport.

According to the first aspect of the invention, the connecting metal fittings are connected to each other in a state in which the ends of the connecting metal fittings are bolted to the ends of the reinforcing ribs, that is, in a state in which the ends of the adjacent reinforcing ribs are connected by the connecting metal fittings. The arc-shaped outer edges of the corners protrude beyond the outer edges of the reinforcing ribs. For this reason, it is possible to more reliably prevent and suppress injury to hands and external damage caused by the ends of the reinforcing ribs.

1 is a perspective view showing a duct with reinforcing ribs according to Embodiment 1 of the present invention; FIG. 2 is a perspective view showing a first wall plate of the duct with reinforcing ribs of FIG. 1; FIG. FIG. 3 is an enlarged view of part A in FIG. 2 ; 2 is a perspective view showing a second wall plate of the duct with reinforcing ribs of FIG. 1; FIG. It is the sectional view (b) which shows the B part enlarged view (a) of FIG. 4, and the seam joint state of a 1st wall plate and a 2nd wall plate. 2 is an enlarged perspective view showing the periphery of a corner piece of the duct with reinforcing ribs in FIG. 1; FIG. FIG. 2 is a front view showing a connecting fitting of the duct with reinforcing ribs in FIG. 1; FIG. 8 is a perspective view showing an attached state of the connecting fitting of FIG. 7;

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below based on the illustrated embodiments.

(Embodiment 1)
FIG. 1 is a perspective view showing a duct 1 with reinforcing ribs according to this embodiment. The reinforcing rib-equipped duct 1 is a duct provided with reinforcing ribs 23, 33, etc., and is formed in a substantially square tubular shape by joining four wall plates 2 to 5 so that air flows in the axial direction. . Here, since the first wall plate 2 and the third wall plate 4 facing each other have the same structure, and the second wall plate 3 and the fourth wall plate 5 facing each other have the same structure, Mainly, the first wall plate 2 and the second wall plate 3 will be explained.

As shown in FIG. 2, the first wall plate 2 is made of a substantially rectangular plate material, and both short sides thereof are bent outward at a substantially right angle to form a flange portion 21 . Both long sides are seam-folded to form joints 22 . A plurality of single seams 22a are continuously formed in the joint portion 22, and together with a double seam 32 to be described later, constitute a button punch snap seam. As shown in FIG. 3, the single seam 22a is formed by cutting the joint 22 into a U-shape and bending the cut portion of the U-shape inward.

A reinforcing rib 23 is formed in the central portion of the first wall plate 2 so as to extend in a direction substantially orthogonal to the axial direction (parallel to the flange portion 21), which is folded in two and protrudes outward. That is, as shown in FIG. 3, the central portion of the first wall plate 2 is folded to form a long plate-shaped reinforcing rib 23, and the reinforcing rib 23 is integrated with the first wall plate 2. . The position and height of the reinforcing ribs 23 are set so that the duct 1 with reinforcing ribs can obtain predetermined strength and rigidity. In addition, the joint portion 22 is provided with a notch portion 22b corresponding to the thickness of the reinforcing rib 23 so that the joint portion 22 is not formed so that the reinforcing rib 23 can be formed. A first bolt insertion hole 23a is formed at both ends of the reinforcing rib 23, that is, at both joint portions 22 side.

As shown in FIG. 4, the second wall plate 3 is made of a substantially rectangular plate material, and both short sides thereof are bent outward at a substantially right angle to form a flange portion 31 . Further, as shown in FIG. 5(a), both long sides are seam-folded to form a double seam 32, and this double seam 32, as shown in FIG. The shingles of the plate 2 are shaped to mesh with the seams 22a. The double seam 32 of the second wall plate 3 is seam-joined to the joint portion 22 of the first wall plate 2 to assemble the first wall plate 2 and the second wall plate 3. .

In addition, in the central portion of the second wall plate 3, similarly to the first wall plate 2, the wall plate 3 is folded in two and protrudes outward in a direction substantially orthogonal to the axial direction (parallel to the flange portion 31). An extending reinforcing rib 33 is formed. The position and height of this reinforcing rib 33 are set to be the same as that of the reinforcing rib 23, and the reinforcing ribs 23, 33 (the reinforcing ribs of the wall plates 4, 5) extend continuously in the circumferential direction of the duct 1 with reinforcing ribs. including) are formed. A second bolt insertion hole 33a is formed at both ends of the reinforcing rib 33, that is, on the double seam 32 side.

Such wall plates 2 to 5 are assembled to form a square cylindrical body. For example, as shown in FIG. An L-shaped corner piece 6 is attached to the . Similarly, corner pieces 6 are attached between other flanges. By inserting a bolt into a hole 6a formed at the corner of the corner piece 6, the corner piece 6 is connected to another duct or the like.

In addition, a connecting fitting 7 is provided for connecting the ends of the reinforcing ribs 23 and 33 adjacent to each other. As shown in FIG. 7, the connecting fitting 7 is a substantially L-shaped flat plate, and two substantially rectangular straight plate portions 71 are arranged in a substantially right angle. A hole 71a is formed. In addition, the outer corners of the free ends of the two straight plate portions 71 are obliquely cut to form inclined portions 71b. Further, the outer edges 7a of the corners (the intersections of the two straight plate portions 71) of the connecting fittings 7 are formed in an arc shape so that the outer edges 7a of the corners protrude outward beyond the outer edges 71c of the two straight plate portions 71. formed.

Then, as shown in FIG. 8, a bolt 81 is inserted into the connecting hole 71a of one straight plate portion 71 of the connecting fitting 7 and the first bolt insertion hole 23a of the reinforcing rib 23, and a nut 82 is tightened on the bolt 81. Thus, one end of the connecting fitting 7 is bolted to one end of the reinforcing rib 23 . Similarly, by inserting a bolt 81 into the connecting hole 71a of the other straight plate portion 71 of the connecting fitting 7 and the second bolt insertion hole 33a of the reinforcing rib 33 and tightening the nut 82 on the bolt 81, the connecting fitting 7 is bolted to the end of the reinforcing rib 33 on the other side.

In this way, the ends of the reinforcing ribs 23 and 33 adjacent to each other are connected by the connecting fittings 7 . The end portions of all adjacent reinforcing ribs 23, 33 (including the reinforcing ribs of the wall plates 4, 5) are similarly connected with the connecting fittings 7. As shown in FIG.

Also, in such a connected state, as shown in FIG. A connecting fitting 7 is formed. 1 and 8, the inclined portion 71b is omitted for the sake of clarity.

According to the duct 1 with reinforcing ribs configured as described above, since the reinforcing ribs 23, 33 and the like are formed by folding the central portions of the wall plates 2 to 5 in two, reinforcing members made of angle steel are spotted. No welding or riveting required. Further, the ends of the adjacent reinforcing ribs 23, 33, etc. can be connected by simply bolting both ends (straight plate portions 71) of the connecting fitting 7 to the ends of the adjacent reinforcing ribs 23, 33, etc. , it is possible to reduce labor, time, and cost compared to conventional spot welding of connecting fittings. In this way, the structure is simple and can be easily manufactured. In addition, since the connecting fitting 7 is a substantially L-shaped flat plate and has a simple shape, it is easy to handle, store, and transport.

Moreover, in a state in which both ends of the connecting metal fitting 7 are bolted to the ends of the reinforcing ribs 23, 33, etc., that is, in a state in which the ends of the adjacent reinforcing ribs 23, 33, etc. are connected by the connecting metal fitting 7, the connecting metal fittings An arc-shaped outer edge 7a at the corner of 7 protrudes from the outer edges of the reinforcing ribs 23, 33 and the like. For this reason, it is possible to more reliably prevent and suppress injury to hands and external damage caused by the ends and corners of the reinforcing ribs 23, 33 and the like.

Although the first embodiment of the present invention has been described in detail above, the specific configuration is not limited to this embodiment. Included in this invention. For example, in Embodiment 1 , the wall plates 2 to 5 are assembled by button punch snap seams, but they may be assembled by other seams or joining methods (such as welding), and the wall plates 2 to 5 may be folded. A coupling method (spin wedge) that unfolds may also be used.

1 duct with reinforcing ribs 2 to 5 wall plate 21 flange 22 joint 22a single seam 23 reinforcing rib 23a first bolt insertion hole 31 flange 32 double seam 33 reinforcing rib 33a second bolt insertion hole 7 connecting fitting 7a corner portion outer edge 71 straight plate portion 71a connecting hole 71b inclined portion 71c outer edge 81 bolt 82 nut

Claims (1)

Four wall plates are joined to form a substantially square cylinder, air flows in the axial direction,
A reinforcing rib extending in a direction substantially perpendicular to the axial direction is formed by folding the central portion of each wall plate into two and protruding outward,
A connecting fitting that connects the ends of the adjacent reinforcing ribs,
The connecting fitting is a substantially L-shaped flat plate, one end of which is bolted to one end of the reinforcing rib, and the other end of which is bolted to the other end of the reinforcing rib ,
The outer edges of the corners of the connecting fittings are formed in an arc shape so that when both ends of the connecting fittings are bolted, the outer edges of the corners of the connecting fittings protrude beyond the outer edges of the reinforcing ribs. formed,
A duct with reinforcing ribs, characterized by:

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