JP2001241744A - Rib duct and method of its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rib duct in which a plurality of outwardly protruded inclined ribs are provided on a constituent surface of a cylindrical duct spaced at a proper interval, the improvement being such that the inclined ribs extending from the left to the right and the inclined ribs extending from the left to the right both on the constituent surface are intersected to form diamond configuration grid ribs. SOLUTION: Inclined ribs serve as diagonal braces in building structure to be excellent in reinforcement effect, and are adapted to be ones with sleeves tucked up, particularly ones having diamond lattice shape, so that the reinforcing effect becomes further high to cause the thickness of an outer plate to be thinner and to reduce a duct weight.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rib duct and a method for producing the same, and more particularly to a duct constructed for air conditioning and the like provided with skewed ribs, especially rhombic lattice ribs, and a method for producing the same.

[0002]

2. Description of the Related Art Ducts are mainly constructed inside buildings for air conditioning, cooling, heating, and exhausting smoke. In such a duct, rib processing has been conventionally performed from the viewpoint of the reinforcing effect of the outer plate, the vibration resistance effect, and the like. For example, the surface of the outer plate 2 forming the duct 1 As shown in FIG. 3, a horizontal rib 3 protruding toward is formed in a direction perpendicular to the direction of the airflow passing through the inside of the duct. In addition, in the figure, 4 is a flange. However, in the ribs according to the conventional example including the horizontal ribs 3, the reinforcing effect and the anti-vibration effect of the outer plate due to the formation of the ribs are likely to be insufficient, and a reinforcing frame is further required. There are drawbacks such as the formation of the ribs being complicated.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a technique capable of overcoming the disadvantages of the prior art. The above and other objects and novel features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a rib duct characterized in that a plurality of sloping ribs protruding outward are provided at appropriate intervals on the constituent surface of a cylindrical duct. A plurality of skew ribs are provided at equal intervals from the left side to the right side of the component surface, and a plurality of skew ribs are also provided at equal intervals from the right side to the left side. The present invention relates to a rib duct characterized by being crossed with a rib, and further comprising a rhombic lattice rib formed by the crossing of the oblique rib. Further, the present invention relates to a method for producing a duct having oblique ribs, wherein an oblique outer rib constituting the duct is obliquely inserted into a squeezing roll to form an oblique rib.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the drawings showing the preferred embodiments. FIG. 1 is an external view of a duct showing an embodiment of the present invention, FIG. 2 (A) is a cross-sectional view taken along line AA in FIG. 1, and FIG. 2 (B) is an example of a method for manufacturing a duct of the present invention. FIG.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, in a rectangular rectangular duct 1, a slanting rib 5 is formed on a four-sided outer plate 2 constituting the duct. As shown in the figure, the skew ribs 5 are provided at equal intervals from the left side to the right side, and a plurality of skew ribs 5 are similarly applied from the right side to the left side. The oblique rib 5 running on the left side intersects. Due to the intersection, as shown, the entire rib 6 on each surface is configured to have a rhombic lattice rib 7. As shown in FIG. 2A, the skew rib 5 is a rib that is convex toward the outside, in other words, a rib that is concave toward the inside.

Next, an example of a method for producing the duct of the present invention will be described. As shown by the dotted line in FIG. 2B, in the conventional example, when an attempt is made to form a horizontal rib on the outer plate of the duct, the outer plate is advanced at right angles to the squeezing roll 8. However, according to the present invention, the outer plate is advanced (inserted) at an angle of, for example, 45 °.
To form skew ribs.

Although the invention made by the present inventor has been specifically described based on the embodiments, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the gist of the invention. Needless to say, For example,
In the above embodiment, the four-sided outer plate 2 constituting the rectangular tubular duct 1
Although the example in which the skew rib 5 is applied to all the surfaces is shown, it may be applied only to at least one surface of the outer plate. In addition, as long as the oblique ribs are provided, the entire ribs 6 on the four surfaces need not be the same. For example, each surface may be changed to have a rhombic lattice rib having a different size. is there.

[0009]

The effects obtained by the representative ones of the inventions disclosed in the present application will be briefly described as follows. That is, according to the present invention, by forming the skew rib, the skew rib acts like a streak in the building structure, has an excellent reinforcing effect, and a plurality of skew ribs are constructed. The reinforcement effect is even higher because it is constructed on the left crossing from above, especially since it is configured to have a rhombic lattice-like rib, the reinforcement effect is even higher, and the material strength is remarkable So that even if the thickness of the outer plate is extremely thin, it can have excellent strength resistance,
As a result, the duct weight can be significantly reduced,
Accordingly, the cost of the duct transportation surface is reduced, and since the duct is a lightweight duct, the work of installing the duct becomes easy, and the work time required for the installation can be significantly reduced.

[Brief description of the drawings]

FIG. 1 is an external view of a duct showing an embodiment of the present invention.

FIG. 2A is a sectional view taken along the line AA in FIG. 1, and FIG. 2B is an explanatory view showing an example of a method for manufacturing a duct of the present invention.

FIG. 3 is an explanatory view of a duct showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Duct 2 ... Outer plate 3 ... Horizontal rib 4 ... Flange 5 ... Skew rib 6 ... Overall rib 7 ... Rhombus lattice rib 8 ... Drawing roll

Claims (4)

[Claims] 1. A rib duct characterized in that a plurality of oblique ribs protruding outward are provided at appropriate intervals on a component surface of a cylindrical duct. 2. A plurality of skew ribs are provided at equal intervals from the left side to the right side of the component surface, and a plurality of skew ribs are also provided at equal intervals from the right side to the left side. The rib duct according to claim 1, wherein the rib duct crosses a skewed rib running at a distance. 3. The rib duct according to claim 1, wherein a rhombic lattice rib is formed by intersection of the oblique ribs. 4. A method for producing a duct having oblique ribs, wherein an oblique outer rib constituting the duct is obliquely inserted into a squeezing roll to form an oblique rib.