JP2024055148A - Double chimney pipe and manufacturing method of the same - Google Patents

Abstract

PURPOSE: To conduct connection work of a double chimney pipe including a heat insulation material quickly.SOLUTION: In a double chimney pipe 1, protruding parts protruding to the outer periphery side of an inner cylindrical body extend in a circumferential direction near both ends of the inner cylindrical body having a first radius and a cylindrical shape. Further, a protruding part protruding to the inner periphery side of the outer cylindrical body extends in the circumferential direction near one end 25 of the outer cylindrical body having a second radius larger than the first radius and the cylindrical shape. Furthermore, the double chimney pipe 1 includes: a heat insulation material 6 disposed between the inner cylindrical body and the outer cylindrical body; a first annular disc 8 which extends along a radial direction between the inner cylindrical body and the outer cylindrical body and seals the heat insulation material while contacting with the protruding part near one end of the inner cylindrical body; and a second annular disc 10 which seals the heat insulation material while contacting with the protruding part near the other end of the inner cylindrical body and the protruding part near the one end of the outer cylindrical body.SELECTED DRAWING: Figure 3

Description

The present invention relates to a chimney pipe used for wood stoves and the like, and more specifically to a double chimney pipe for discharging smoke from a wood stove to the outdoors, and a method for manufacturing the same.

Smoke from wood stoves and other stoves flows through connected chimney pipes and is exhausted to the outdoors (see Figure 6). However, smoke flowing through chimney pipes installed outdoors can condense in the cold outside air, especially in cold regions, and turn into soot that adheres to the inner wall of the chimney pipe. If soot accumulates inside the chimney pipe, it will deteriorate. Furthermore, stove users and others may be burned by touching the metal chimney pipe. To prevent these incidents, double chimney pipes equipped with insulation with low thermal conductivity are often used.

A double chimney pipe generally consists of an inner tube, an outer tube concentrically arranged at a distance from the inner tube, and insulation provided between the inner tube and the outer tube.

The task of fixing insulation between the inner and outer tubes of such conventional double chimney pipes and connecting multiple double chimney pipes to the appropriate length at the stove installation site was time-consuming.

JP 2015-152029 A Japanese Utility Model Application Publication No. 54-101639 Japanese Utility Model Application Publication No. 63-121246

The present invention aims to provide a double chimney pipe that allows the work of connecting multiple double chimney pipes equipped with thermal insulation to be performed quickly at the site where the stove is installed. It also aims to present a method for manufacturing such a double chimney pipe.

A double chimney pipe having an inner cylinder and an outer cylinder is provided, the double chimney pipe being provided with: an inner cylinder having a cylindrical shape with a first radius, and having circumferentially extending protrusions near both ends of the inner cylinder that protrude toward the outer periphery of the inner cylinder; an outer cylinder having a cylindrical shape with a second radius greater than the first radius and spaced apart from the inner cylinder and arranged concentrically; a heat insulating material arranged between the inner cylinder and the outer cylinder; and a first annular disk extending radially between the inner cylinder and the outer cylinder, the first annular disk being provided to seal the heat insulating material while abutting against the protrusion near one end of the inner cylinder, and a second annular disk being provided to seal the heat insulating material while abutting against the protrusion near the other end of the inner cylinder and the protrusion near one end of the outer cylinder.

In one embodiment, the first annular disk and the second annular disk are each characterized in that the outer edge of the inner cylinder body is crimped.

In a further embodiment, the axial length of the outer cylinder is longer than the axial length of the inner cylinder, and the opening radius of the one end of the outer cylinder is shorter than the opening radius of the other end of the outer cylinder by several millimeters so that the outer cylinders can be fitted together up to a position where the end of one outer cylinder abuts against the protrusion protruding toward the outer periphery of the other outer cylinder, and the protrusion protruding toward the outer periphery of the outer cylinder extends in the circumferential direction of the outer cylinder at a position a predetermined distance away from the one end of the outer cylinder.

In addition, in a method for manufacturing a double chimney pipe having an inner cylinder and an outer cylinder, the steps include the steps of abutting the inner edge of a first annular disk formed to a size that can fit between the inner cylinder and the outer cylinder along the radial direction against a protrusion that protrudes toward the outer periphery so as to extend in the circumferential direction of the inner cylinder near one end of the inner cylinder, and crimping the edge of the first annular disk that is outside the protrusion near one end of the inner cylinder, arranging a heat insulating material on the outer periphery of the inner cylinder, pushing the inner cylinder into the outer cylinder from the opening of the other end of the outer cylinder with the other end of the inner cylinder leading so that the other end of the inner cylinder extends outward beyond the one end of the outer cylinder, and The present invention provides a method for manufacturing a double chimney pipe, which includes the steps of: abutting the inner edge of a second annular disk formed to a size that can fit between the inner and outer cylinders in the radial direction against a convex portion that protrudes toward the outer periphery of the inner cylinder so as to extend in the circumferential direction near the other end of the inner cylinder, and crimping the edge outside the convex portion near the other end of the inner cylinder against the inner edge of the second annular disk; and pushing the inner cylinder back toward the inner periphery of the outer cylinder, abutting the outer edge of the second annular disk against a convex portion that protrudes toward the inner periphery of the outer cylinder so as to extend in the circumferential direction near one end of the outer cylinder, and crimping the edge outside the convex portion near the one end of the outer cylinder against the outer edge of the second annular disk.

FIG. 2 is a perspective view showing the components of a double chimney pipe. A diagram showing the assembly procedure for a double chimney pipe. A diagram showing the assembly procedure for a double chimney pipe. FIG. 2 is a perspective view showing a schematic configuration of a double chimney pipe according to the present invention; 1A shows the top side, (b) side, (c) bottom side, and (d) cross section of a double chimney pipe. FIG. 2 is an enlarged perspective view of both ends of a double chimney pipe. Diagram showing a double chimney pipe installed on a wood stove.

The double chimney pipe of the present invention will be described below with reference to the attached drawings.

Figure 1 shows the components of a double chimney pipe 1: (a) an inner cylinder 2, (b) an outer cylinder 4, (c) a heat insulating material 6, and (d) two annular disks 8, 10. In general, the axial length of the outer cylinder 4 is longer than the axial length of the inner cylinder 2. As an example of the material for the inner cylinder 2, the outer cylinder 4, and the annular disks 8, 10, a thin plate of a heat-resistant metal (including stainless steel as a metal) that is easy to process and shape can be used.

The inner cylinder 2 has a first radius, and is rolled so that the convex parts 12a, 12b protruding toward the outer periphery of the inner cylinder 2 extend in the circumferential direction near both ends of the inner cylinder 2. The outer cylinder 4 has a second radius larger than the first radius of the inner cylinder 2, and is rolled so that the convex part (in other words, the concave part recessed toward the inner periphery) 14 protruding toward the inner periphery of the outer cylinder 4 extends in the circumferential direction near one end 25 of the outer cylinder 4. Furthermore, at a position a predetermined distance away from the one end 25, the convex part 16 protruding toward the outer periphery of the outer cylinder 4 extends in the circumferential direction. The insulating material 6 provided between the inner cylinder 2 and the outer cylinder 4 is made of a heat-resistant material such as glass wool.

The annular disks 8, 10 have an inner diameter (i.e., the length from the center of the ring to the inner edge 20) that is approximately the same as or slightly longer than the first radius of the inner cylinder 2, and an outer diameter (i.e., the length from the center of the ring to the outer edge 22) that is approximately the same as or slightly shorter than the second radius of the outer cylinder 4, so that they can fit radially between the inner cylinder 2 and the outer cylinder 4. The double chimney pipe 1 of the present invention is completed by assembling the above-mentioned components.

Figures 2A(a)-(d) and 2B(e)-(h) show the assembly procedure for the double chimney pipe 1 of the present invention.

First, as shown in FIG. 2A(a), a first annular disk 8 formed to a size that can fit between the inner cylinder 2 and the outer cylinder 4 in the radial direction is abutted against a protrusion 12a that protrudes toward the outer periphery so as to extend in the circumferential direction of the inner cylinder 2 near one end 17 of the inner cylinder 2. Then, using a hammer or the like, the edge of the first annular disk 8 that is outside the protrusion 12a of one end 17 of the inner cylinder 2 is crimped to the inner edge 20 of the first annular disk 8, thereby fixing it.

Next, as shown in FIG. 2A(b), the insulating material 6 is attached to the outer circumferential surface 30 of the inner cylinder 2 by wrapping it around it. Then, as shown in FIG. 2A(c), the insulating material 6 is attached to the inner cylinder 2.

Next, as shown in FIG. 2A(d), the inner cylinder 2 is pushed into the outer cylinder 4 from the opening at the other end 26 of the outer cylinder 4, starting from the other end 18 of the inner cylinder 2, so that the other end 18 of the inner cylinder 2 extends outward beyond the one end 25 of the outer cylinder 4.

Next, as shown in FIG. 2B(e), the inner edge 20 of the second annular disk 10, which is sized to fit between the inner and outer cylinders in the radial direction, is brought into contact with the convex portion 12b formed near the other end 18 of the inner cylinder 2. Then, using a hammer or the like, the outer edge of the convex portion 12b of the other end 18 of the inner cylinder 2 is crimped onto the inner edge 20 of the second annular disk 10, thereby fixing the first annular disk 10 to the inner cylinder 2, resulting in the state shown in FIG. 2B(f).

Next, as shown in FIG. 2B(g), the inner cylinder 2 is pushed back toward the inside of the outer cylinder 4, and the outer edge 22 of the second annular disk 10 is brought into contact with a convex portion 14 (in other words, a concave portion recessed toward the inner edge) that protrudes toward the inner periphery and extends circumferentially of the outer cylinder 4 near one end 25 of the outer cylinder 4. Then, using a hammer or the like, the outer edge of the second annular disk 10 is crimped to the outer edge 22 of the second annular disk 10, which is located outside the one end 25 of the outer cylinder 4, and the second annular disk 10 is fixed to the outer cylinder 4 as well, resulting in the state shown in FIG. 2B(h).

Following the above assembly procedure, one double chimney pipe 1 is completed. It will be understood that the double chimney pipe 1 can also be manufactured by rearranging some of the assembly procedures.

Figure 3(a) is a perspective view showing a schematic diagram of an assembled double chimney pipe 1. Figure 3(b) is a cross-sectional view taken along the longitudinal axis of the double chimney pipe 1 shown in Figure 3(a). The outer cylinder 4 is arranged concentrically and spaced from the inner cylinder 2, and a heat insulating material 6 is provided between the inner cylinder 2 and the outer cylinder 4. Furthermore, annular disks 8 and 10 are attached to both ends of the inner cylinder 2 to seal the heat insulating material 6.

Figure 4(a) shows the top side of the double chimney pipe 1. Figure 4(b) shows the side of the double chimney pipe 1. Figure 4(c) shows the bottom side of the double chimney pipe 1. Figure 4(d) shows a cross section of the double chimney pipe 1 cut along line A-A in Figure 4(b).

As shown in Figures 3 and 4, the protrusion 16 that protrudes toward the outer periphery of the outer cylinder 4 is rolled to extend in the circumferential direction at a position a predetermined distance away from one end 25 of the outer cylinder 4, and the opening radius of the one end 25 of the outer cylinder 4 is made a few millimeters smaller than the opening radius of the other end 26 where the protrusion 16 is not formed. If this difference of a few millimeters is made from the one end 25 of the outer cylinder 4 to the above-mentioned predetermined distance, the two outer cylinders 4 can be fitted together up to the position where the end 26 of the other outer cylinder 4 abuts against the protrusion 16 formed on one outer cylinder 4, thereby connecting two double chimney pipes 1.

Figure 5 is an enlarged perspective view of both ends of the double chimney pipe 1 shown in Figures 3 and 4. In the embodiment shown in Figure 5, the convex portion 12a protruding toward the outer periphery of the inner cylinder 2, the convex portion 14 protruding toward the inner periphery of the outer cylinder 4, and the convex portion 16 protruding toward the outer periphery of the outer cylinder 4 are rolled to have a rounded shape.

The crimped edge of the inner cylinder 2 on the first annular disk 8 is shown as crimped portion 24a, the crimped edge of the inner cylinder 2 on the second annular disk 10 is shown as crimped portion 24b, and the crimped edge of the outer cylinder 4 on the second annular disk 10 is shown as crimped portion 28.

Figure 6 shows a double chimney pipe 1 attached to a wood stove 34 so that it extends to the outside of a building 32. The insulation material 6 arranged between the inner cylinder 2 and the outer cylinder 4 of the double chimney pipe 1 of the present invention is supported in a predetermined position by annular disks 8 and 10, so that multiple double chimney pipes 1 can be quickly connected at the stove installation site.

In addition, in the manufacturing method of the double chimney pipe 1 of the present invention, the annular disks 8, 10 can be easily positioned by abutting them against the protrusions 12a, 12b, 14 rolled on the inner cylinder 2 and the outer cylinder 4, thereby shortening the assembly time of the double chimney pipe 1 and reducing manufacturing costs.

1...Double chimney pipe 2...Inner cylinder 4...Outer cylinder 6...Insulating material 8...First annular disk 10...Second annular disk 12a...(protruding toward the outer periphery of the inner cylinder)Convex portion 12b...(protruding toward the outer periphery of the inner cylinder)Convex portion 14...(protruding toward the inner periphery of the outer cylinder)Convex portion 16...(protruding toward the outer periphery of the outer cylinder)Convex portion 17...One end portion 18 (of the inner cylinder)...Other end portion 20 (of the inner cylinder)...Inner edge portion (inner periphery edge portion)
22...Outer edge portion (outer peripheral edge portion)
24a... Crimping portion 24b... Crimping portion 25... (of the outer cylinder) one end 26... (of the outer cylinder) other end 28... Crimping portion 30... Outer periphery 32... Building 34... Wood stove

Claims (4)

In a double chimney pipe having an inner cylinder and an outer cylinder,
an inner cylindrical body having a cylindrical shape with a first radius, the inner cylindrical body having circumferentially extending protrusions protruding toward an outer periphery of the inner cylindrical body near both ends thereof;
an outer cylinder body, which is arranged concentrically with and spaced apart from the inner cylinder body and has a cylindrical shape with a second radius larger than the first radius, and which has a protrusion protruding toward an inner periphery of the outer cylinder body near one end thereof and extending in a circumferential direction;
a heat insulating material disposed between the inner cylinder and the outer cylinder;
a first annular disk extending radially between the inner cylinder and the outer cylinder, the first annular disk being provided to seal the heat insulating material while contacting a protrusion near one end of the inner cylinder, and a second annular disk being provided to seal the heat insulating material while contacting a protrusion near the other end of the inner cylinder and a protrusion near one end of the outer cylinder;
A double chimney pipe. The double chimney pipe according to claim 1, characterized in that the first annular disk and the second annular disk are each crimped at their outer edges that are closer to the protruding portion of the inner cylinder. The axial length of the outer cylinder is longer than the axial length of the inner cylinder,
3. A double chimney pipe as described in claim 2, characterized in that the opening radius of one end of the outer cylinder is formed to be shorter by several millimeters than the opening radius of the other end of the outer cylinder so that the outer cylinders can be fitted together up to a position where the end of one outer cylinder abuts against the convex portion protruding toward the outer periphery of the other outer cylinder, and the convex portion protruding toward the outer periphery of the outer cylinder extends in the circumferential direction of the outer cylinder at a position a predetermined distance away from the one end of the outer cylinder. A method for manufacturing a double chimney pipe having an inner cylinder and an outer cylinder, comprising the steps of:
a step of abutting an inner edge of a first annular disk formed to a size capable of fitting between the inner and outer cylindrical bodies along a radial direction against a protrusion that protrudes toward the outer periphery so as to extend in the circumferential direction of the inner cylindrical body near one end of the inner cylindrical body, and crimping an edge of the first annular disk that is outer than the protrusion near one end of the inner cylindrical body to the inner edge of the first annular disk;
A step of disposing a heat insulating material on an outer peripheral surface of the inner cylinder body;
a step of pushing the inner cylindrical body into the outer cylindrical body from the opening of the other end portion of the outer cylindrical body, starting from the other end portion of the inner cylindrical body, so that the other end portion of the inner cylindrical body extends outward beyond the one end portion of the outer cylindrical body;
a step of abutting an inner edge of a second annular disk formed to a size capable of fitting between the inner and outer cylindrical bodies along a radial direction against a protrusion protruding toward an outer circumferential side so as to extend in a circumferential direction of the inner cylindrical body near the other end of the inner cylindrical body, and crimping an edge of the second annular disk that is outer than the protrusion near the other end of the inner cylindrical body to the inner edge of the second annular disk;
a step of pushing the inner cylinder back toward the inner periphery of the outer cylinder, bringing an outer edge of the second annular disk into contact with a protrusion that protrudes toward the inner periphery and extends in the circumferential direction of the outer cylinder near one end of the outer cylinder, and crimping an edge of the second annular disk that is outside the protrusion near one end of the outer cylinder to the outer edge of the second annular disk;
A method for manufacturing a double chimney pipe, comprising: