JP3015918U - Stack - Google Patents

Abstract

(57) [Summary] [Purpose] To make the exhaust stack extremely easy to manufacture, and to ensure the airtightness of the connecting points of the exhaust stack. [Structure] The exhaust pipe 1 is plastically deformed so that a portion corresponding to the vicinity A of one end opening of the overlapping portion 3 of the cylindrical body 2 is recessed radially inward. [Effect] When the exhaust pipe 1 is fitted into another exhaust pipe having an inner diameter slightly larger than the outer diameter in the vicinity of the one end opening A, the overlapping portion 3 is pressed by the inner peripheral surface of the other exhaust pipe and is radially inside. There is no deformation. Therefore, no gap is formed between the outer peripheral surface of the exhaust stack 1 and the inner peripheral surfaces of the other exhaust stacks.

Description

[Detailed description of the device]

[0001]

[Industrial field of application]

 This invention relates to an exhaust stack used as a chimney of a stove or the like.

[0002]

[Prior art]

 Conventionally, a steel cylinder 2 having a cross-sectional shape as shown in FIG. 6 has been applied as a chimney such as a stove. As shown in FIG. 7, such a tubular body 2 has one edge 4a of a rectangular thin steel plate 4 folded back to the front side, the other edge 4b folded back to the back side, and the thin steel plate 4 is further folded. It is obtained by curving in a roll shape, superimposing the back surface of the other edge portion 4b along the surface of the one edge portion 4a, and hooking the overlapping portions 3 of these both edge portions 4a, 4b with each other. To be Further, when a relatively long exhaust path is required for exhausting fumes from a stove or the like to a distant place, as shown in FIG. The cylindrical bodies 2 and 2'are connected to each other by being fitted into the other end opening B.

[0003]

[Problems to be solved by the device]

 However, as described above, since no O-ring, gasket or the like is provided at the connecting portion of the cylinders 2 and 2 ′, the number of parts is small and the manufacturing cost can be minimized. Is projected from the outer peripheral surface of the cylindrical body 2, the overlapping portion 3 of the cylindrical body 2 is pressed against the inner peripheral surface of another cylindrical body 2 ', as shown in FIG. The overlapping portion 3 of the body 2 and its peripheral portion are elastically deformed inward in the radial direction. Therefore, there is a problem that a gap t is generated between the outer peripheral surface near the opening A at one end of the cylindrical body 2 and the inner peripheral surface of another cylindrical body 2 ', and the smoke exhausts to the outside from the clearance t. .

An object of the present invention is to provide an exhaust cylinder that is extremely easy to manufacture and that can secure airtightness at a connecting portion.

[0005]

[Means for Solving the Problems]

 The present invention has been made in view of the above-mentioned problems, and a means thereof is to bend a rectangular thin steel plate into a roll shape and follow the surface of one edge of the thin steel plate. By overlapping the back surface of the other edge portion and folding back the one edge portion toward the front surface side and folding the other edge portion toward the back surface side, the overlapping portions of both of these edge portions are hooked to each other. In the exhaust pipe, the portion corresponding to the vicinity of the one end opening of the overlapping portion is plastically deformed so as to be recessed radially inward.

[0006]

[Action]

 According to the exhaust stack of this invention, the portion corresponding to the vicinity of the one end opening of the overlapping portion is plastically deformed so as to be radially inwardly embedded. When fitted into another exhaust pipe having an inner diameter slightly larger than the diameter, the overlapped portion may be pressed by the inner peripheral surface of the other exhaust pipe, and the overlapped portion and its periphery may be deformed radially inward. Absent.

[0007]

【Example】

 An exhaust stack according to an embodiment of the present invention will be described with reference to FIGS. The same configurations as those of the conventional technique are designated by the same reference numerals and duplicate description will be omitted. As shown in FIG. 1, the exhaust pipe 1 according to the embodiment is formed by plastically deforming a portion of the tubular body 2 corresponding to the vicinity A of the one end opening of the overlapping portion 3 so as to be recessed radially inward. is there. As described in the description of the prior art, the cylindrical body 2 is formed by superposing the back surface of the one edge 4b along the surface of the one edge 4a of the thin steel plate 4 and the one edge 4a on the surface. The edge portion 4b is folded back to the back side and the edge portion 4b is folded back to the back surface side, so that the overlapping portions 3 of these edge portions 4a and 4b are hooked to each other.

The processing method for plastically deforming the overlapping portion 3 is not particularly limited, but an example thereof will be described below. That is, as shown in FIG. 2, a mold 5 having a recessed line 5a extending in the longitudinal direction is prepared. As shown in FIG. 3, the recessed line 5a is directly below the overlapping portion 3 as shown in FIG. It is fitted into the opening C at one end of the cylindrical body 2 in a manner corresponding to. When a metal plate (not shown) is brought into contact with the upper surface of the overlapping portion 3 and is hit with a hammer or the like, the overlapping portion 3 is plastically deformed inward in the radial direction indicated by an arrow a, and the mold 5 It will be immersed in the groove 5a. As a result, the vicinity A of the one end opening of the cylindrical body 2 has a sectional shape as shown in FIG.

The exhaust pipe 1 near the one end opening A obtained as described above has an inner diameter slightly larger than the outer diameter of the exhaust pipe 1 near the one end opening A, for example, as shown in FIG. When fitted into the end opening 6a of the elbow 6 as shown, the overlapping portion 3 of the exhaust pipe 1 does not project from the outer peripheral surface, so that the overlapping portion 3 is pressed against the inner peripheral surface of the elbow 6 and radially extends. Does not deform inward. Therefore, a gap is not formed between the outer peripheral surface of the exhaust pipe 1 and the inner peripheral surface of the elbow 6, and the airtightness of the joint between the exhaust pipe 1 and the elbow 6 can be secured.

In the description of the above embodiment, the case where the vicinity A of the one end opening of the exhaust pipe 1 is fitted into the end opening 6a of the elbow 6 has been described. Even when it is fitted into the other end opening (not shown) of another exhaust cylinder 1 configured in the same manner as No. 1, there is a gap between the outer peripheral surface of the exhaust cylinder 1 and the inner peripheral surface of another exhaust cylinder 1. The airtightness of these joints can be secured without causing

Although not described in the above embodiment, as well shown in FIGS. 1 and 5, a stopper 7 is formed inside one end of the exhaust pipe 1 by bulging the outer peripheral surface. The stopper 7 allows the elbow 6 or the other end of the exhaust pipe 1 to be positioned. Further, it is desirable that the vicinity A of the one end opening of the exhaust pipe 1 is a tapered surface inclined in the diameter reducing direction so that the exhaust pipe 1 can be easily fitted into the inside of the exhaust pipe 6 or another exhaust pipe 1.

[0012]

[Effect of device]

 According to the exhaust pipe of the present invention, when the exhaust pipe near the one end opening is fitted into another exhaust pipe having an inner diameter slightly larger than the outer diameter near the one end opening, the overlapping portion causes the overlapping portion to move to the other exhaust pipe. There is no possibility that the overlapped portion and its peripheral portion will be deformed radially inward by being pressed by the inner peripheral surface of the. Therefore, no gap is formed between the outer peripheral surface near the one end opening of the exhaust pipe and the inner peripheral surface of another exhaust pipe, and the airtightness of these joints can be secured.

[Brief description of drawings]

FIG. 1 is a side view of an exhaust stack according to an embodiment of the present invention.

FIG. 2 is a perspective view of a main part of a mold used for manufacturing an exhaust stack according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a process of manufacturing an exhaust stack according to an embodiment of the present invention.

FIG. 4 is a sectional view of an exhaust stack according to an embodiment of the present invention.

FIG. 5 is a perspective view showing a procedure for connecting an exhaust pipe to an elbow according to an embodiment of the present invention.

FIG. 6 is a cross-sectional view of a tubular body conventionally used as an exhaust stack.

FIG. 7 is a perspective view of a thin steel plate with both edges folded back.

FIG. 8 is a side view showing a procedure for connecting tubular bodies used as exhaust tubes in the related art.

FIG. 9 is a cross-sectional view showing a state in which tubular bodies used as exhaust tubes in the related art are connected to each other.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Exhaust stack 3 Overlapping part 4 Thin steel plate 4a One edge part 4b Other edge part A Near one end opening

Claims (1)

[Scope of utility model registration request] 1. A rectangular thin steel plate is curved into a roll shape,
By superimposing the back surface of the other edge along the surface of one edge of the thin steel plate, and by folding back the one edge to the front side and the other edge to the back side, these An exhaust stack formed by engaging the overlapping portions of both edges with each other, wherein a portion corresponding to the vicinity of one end opening of the overlapping portion is plastically deformed so as to be recessed radially inward. Exhaust stack.