JP2010065910A - Duct - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a duct efficiently preventing adhesion of air to an inner wall face of a duct body, reducing air resistance, achieving sufficient strength even by using a thin steel plate material and reducing costs. <P>SOLUTION: In the duct formed by interconnecting the duct bodies formed by the steel plate material by using connecting fittings, an air adhesion prevention part comprising any of a large number of recesses, projections, or recesses and projections preventing adhesion of air made to flow within the duct body to the inner wall face and enhancing strength, is formed on the wall face of the duct body. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a duct used for air conditioning, exhaust and the like.

Conventional ducts are made by winding a strip-shaped steel plate in a spiral shape, forming a duct body in the shape of a pipe, or forming a duct body in the shape of a square tube, and connecting the duct body using an insertion joint. I use it.

The duct body formed in this way has a drawback in that the air flowing in the duct body sticks to the inner wall surface of the duct body and the air resistance increases, so that the load on the blower and the like increases.
Further, in order to obtain a sufficient strength, a thick steel plate material has to be used, and there is a disadvantage that the cost is increased.
nothing special

    In view of the conventional drawbacks as described above, the present invention can effectively prevent air from sticking to the inner wall surface of the duct body, can reduce air resistance, and has sufficient strength even with a thin steel plate material. An object of the present invention is to provide a duct that can be obtained and can reduce costs.

  Another object of the present invention is that the duct main body can be easily connected in a short time and can be connected with a connection fitting that is a part of the duct suspension fitting, thereby reducing the cost. The purpose is to provide a duct.

The above and other objects and novel features of the present invention will become more fully apparent when the following description is read in conjunction with the accompanying drawings.
However, the drawings are for explanation only and do not limit the technical scope of the present invention.

In order to achieve the above object, the present invention is a duct in which a duct body formed of a steel plate material is connected using a connection fitting, and prevents the air flowing in the duct body from sticking to the inner wall surface and has a strength. A plurality of concave portions, convex portions, or uneven portions for preventing air sticking, which can be increased, are formed on the wall surface of the duct body to constitute the duct.

  As is clear from the above description, the present invention has the following effects.

(1) Since there are formed a plurality of air sticking prevention portions, either concave portions, convex portions or concave and convex portions, which prevent the air flowing in the duct main body from sticking to the inner wall surface, the air flows through the duct main body. Air resistance can be reduced.
Therefore, the load on the blower and the like can be reduced, and labor saving can be achieved.

(2) According to the above (1), the air sticking prevention portion is formed in the duct body by any one of a large number of concave portions, convex portions, or concave and convex portions. The strength of the main body can be improved, and sufficient strength can be obtained even if a thin steel plate material is used, and the cost can be reduced.

(3) Claim 2 can obtain the same effect as the above (1) and (2), and can be used by connecting with a ring-shaped fitting using a flange-shaped flange formed at the end of the duct body. can do.
Therefore, the connection work is easy, can be done in a short time, and cost can be reduced.
Further, by using the ring-shaped connection fitting as a support belt for the duct main body of the suspension fitting, the cost can be reduced and the attachment work can be performed efficiently.

  Hereinafter, the present invention will be described in detail by the best mode for carrying out the present invention shown in the drawings.

  In the best mode for carrying out the present invention shown in FIGS. 1 to 9, 1 is a duct of the present invention used for air conditioning, exhaust, etc., and this duct 1 is formed of a steel plate material. A plurality of duct main bodies 2 are connected by a connection fitting 3 and are attached to a suspension fitting 5 that is suspended from a ceiling casing 4 at the connection fitting 3 site.

The duct body 2 is formed in a cylindrical shape as shown in FIGS. 4 and 5, and a pair of flanges integrally formed so as to protrude outwardly at both ends using flanges and molding machines, like flanges. 6 and 6 are formed, and the cylindrical wall surface has a circular arc concave shape that can prevent a large number of air flowing in the duct body 2 from sticking to the inner wall surface at a predetermined interval and can increase the strength. The air sticking prevention unit 7 is configured.
The duct body 2 may be a round spiral duct, a round weld duct, or a single round goby duct.

  As shown in FIGS. 6 to 8, the connecting fitting 3 is a collar housing that covers the overlapping flanges 6, 6 of the duct bodies 2, 2 formed so as to protrude outward in a mountain shape at the center. The outer wall surface near the end portion of the duct main body 2 is formed with inclined surfaces 9 and 9 so that the tip portion protruding outward from the both sides of the portion 8 and the flange storage portion 8 in a substantially right angle direction has a small diameter. 2a, 2a, a ring-shaped connecting metal body 11 cut off from a part of the supporting pieces 10 and 10, and fixed to the supporting pieces 10 and 10 at the cut end of the connecting metal body 11 by spot welding or the like. A pair of fixing members 12, 12, a pair of mounting members 14, in which one end portions of the pair of fixing members 12, 12 are bent at substantially right angles to form recesses 13, 13 into which the flange storage portions 8, 8 enter. 14, the pair of mounting members 14, Are formed of a pair of mounting pieces 16 and 16, bolt insertion holes 15 and 15 of the pair of mounting pieces 16 and 16, and bolt insertion holes 15 and 15. As shown in FIG. 9, a bolt 19 inserted into the bolt insertion hole 18 of the mounting plate 17 of the suspension metal fitting 5 and a nut 20 screwed with the bolt 19 are disposed between or on one side surface. And a fastening fixture 21.

The duct 1 configured as described above makes the flanges 6, 6 formed at the end of the duct body 2 abut, and the abutted flanges 6, 6 are placed in the flange storage portion 8 of the connection fitting body 11. The bolt 19 is inserted into the bolt insertion holes 15 and 15 of the pair of attachment pieces 16 and 16 and the bolt insertion hole 18 of the attachment plate 17 of the hanging bracket 5, and the nut 20 is screwed and fixed to the bolt 19. The connection of the duct main body 2 and the installation work in a suspended state from the ceiling housing 4 are completed, and the connection and installation work can be easily performed even in a short time even by an unskilled person.
[Different forms for carrying out the invention]

  Next, different modes for carrying out the present invention shown in FIGS. 10 to 23 will be described. In the description of these different modes for carrying out the present invention, the same components as those in the best mode for carrying out the present invention are designated by the same reference numerals and redundant description is omitted. To do.

  The second embodiment for carrying out the present invention shown in FIGS. 10 to 12 is mainly different from the best first embodiment for carrying out the present invention in that a cylindrical wall surface has an arc-convex shape. Since the duct main body 2A in which a large number of air sticking prevention portions 7A are formed at predetermined intervals is used, the duct 1A configured using such a duct 2A is the best for carrying out the present invention. The same effect as the first embodiment can be obtained.

  The third embodiment for carrying out the present invention shown in FIGS. 13 to 15 is mainly different from the best first embodiment for carrying out the present invention in that a cylindrical wall surface has an irregular shape of an arc. In order to use the duct main body 2B in which a large number of the air sticking prevention portions 7B are formed at predetermined intervals, the duct 1B configured using such a duct main body 2B can be used to implement the present invention. The same effects as those of the best first embodiment can be obtained.

The fourth embodiment for carrying out the present invention shown in FIG. 16 to FIG. 19 is mainly different from the best first embodiment for carrying out the present invention in that flange-like flanges 6A at both ends, 6A is formed, and a rectangular cylindrical duct body 2C in which a large number of arc-shaped concave-shaped air sticking prevention parts 7 are formed on the wall surface at a predetermined interval is used, and a rectangular cylindrical shape that connects the rectangular flanges 6A and 6A is used. Even in the duct 1C configured by using the duct body 2C and the connection fitting 3A, the same action as that of the best first embodiment for carrying out the present invention is achieved in that the connection fitting 3A is used. An effect is obtained.
In the embodiment for carrying out the present invention, the same effect can be obtained even if a duct main body in which an arc sticking prevention portion or an arc sticking prevention portion of an arc is formed on the wall surface.

In the fifth embodiment for carrying out the present invention shown in FIGS. 20 to 23, the main difference from the first embodiment for carrying out the present invention is that the wall surface connected by the plug-in joint 22 In addition, a duct body 2D in which a large number of arc-shaped concave air sticking prevention portions 7 are formed at predetermined intervals is used, and a belt 23 that supports the duct body 2D is attached to a bolt insertion hole 18 of a mounting plate 17 of a hanging bracket 5 with bolts 19. Even in the duct 1D configured as described above in terms of being fixed by the nut 20, the best air flow resistance of the first embodiment for carrying out the present invention is reduced, and the strength of the duct body 2D is reduced. An effect similar to the effect that can be improved is obtained.
It is to be noted that the same effect can be obtained even if the arc main body 2D is formed with an arc-shaped convex portion or a circular arc-shaped air sticking prevention portion.
Moreover, in the form for implementing this invention, you may use what formed the duct main body 2D in the shape of a square cylinder.

  The present invention is utilized in industries that manufacture ducts used for air conditioning, exhaust, and the like.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram of the best first embodiment for carrying out the present invention. Sectional drawing which follows the 2-2 line of FIG. Sectional drawing which follows the 3-3 line of FIG. The top view of the duct main body of the best 1st form for implementing this invention. Sectional drawing which follows the 5-5 line of FIG. The front view of the connection metal fitting of the best 1st form for carrying out the present invention. The side view of the connection metal fitting of the best 1st form for carrying out the present invention. Sectional drawing which follows the 8-8 line of FIG. Explanatory drawing which shows the attachment state of the hanging metal fitting of the best 1st form for implementing this invention. Explanatory drawing of the 2nd form for implementing this invention. The top view of the duct main body of the 2nd form for implementing this invention. Sectional drawing which follows the 12-12 line of FIG. Explanatory drawing of the 3rd form for implementing this invention. The top view of the duct main body of the 3rd form for implementing this invention. FIG. 15 is a sectional view taken along line 15-15 in FIG. 14; Explanatory drawing of the 4th form for implementing this invention. FIG. 17 is a sectional view taken along line 17-17 in FIG. 16; The top view of the duct main body of the 4th form for carrying out the present invention. FIG. 19 is a cross-sectional view taken along line 19-19 of FIG. Explanatory drawing of the 5th form for implementing this invention. Explanatory drawing which follows the 21-21 line of FIG. The top view of the duct main body of the 5th form for implementing this invention. FIG. 23 is a sectional view taken along line 23-23 in FIG. 22;

Explanation of symbols

1, 1A, 1B, 1C, 1D: duct,
2, 2A, 2B, 2C, 2D: duct body,
3, 3A: connection bracket, 4: ceiling frame,
5: Suspension bracket, 6, 6A: Brim,
7, 7A, 7B: Air sticking prevention part,
8: collar storage part, 9: inclined surface,
10: support piece, 11: connection metal fitting body,
12: fixing member, 13: recess,
14: mounting member, 15: bolt insertion hole,
16: Mounting piece, 17: Mounting plate,
18: Bolt insertion hole, 19: Bolt,
20: Nut, 21: Tightening fixture,
22: Plug-in joint, 23: Belt.

Claims (3)

In the duct connecting the duct body formed of the steel plate material using the connection fitting, while preventing the air flowing in the duct body from sticking to the inner wall surface, a large number of recesses that can increase the strength, A duct characterized in that an air sticking prevention portion of either a convex portion or an uneven portion is formed on the wall surface of the duct body. 2. The duct according to claim 1, wherein the duct body has a cylindrical shape, and flange-shaped flanges connected to each other by ring-shaped connection fittings are formed at both ends. The duct according to any one of claims 1 and 2, wherein the connection fitting for connecting the duct main body is configured to be attached to the suspension fitting.

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