JPH03151130A - Manufacture of heat exchanger for boiler - Google Patents

Abstract

PURPOSE:To simplify the the manufacturing process and to minimize the required man hour by fixing the exhaust cover cap to the inner body without using of packing or bolt that the cap covers the upper end opening part of the inner body of the heat exchanger and introduces the exhaust to the side direction. CONSTITUTION:The heat exchanging pipe 3 is inserted in the pipe setting hole 11f opened at the body wall of the square cylindrical type inner body 11. The elongated part 11a is composed with elongating the inner body 11 and the three sides of its upper end part is bent to the outer side and the flange 11c-1, etc., is formed. The other one side is cut and opened so the opening part 11d is set and the edges is bent and the flange 11e-1 is formed. The exhaust cover cap is composed, its one side is bent and the bent down plate 12a is formed, the window type opening 12b is set. The flange 11e-1 etc., is inserted to the opening 12b, and the exhaust cover cap 12 is lain on the inner body 11. The flange 11e-1, etc., are bent to the inner side so as to pack the 3 surrounding sides of the exhaust cover cap and are pressed. Therefore, the exhaust cover cap is fixed without packing or fixing bolt and the process can be shortened.

Description

[Detailed description of the invention] [Industrial application field] The present invention has a rectangular cylindrical inner shell installed vertically.

The present invention relates to a method of manufacturing a heat exchanger for a water heater, which includes a heat exchange part installed inside the inner shell, and a member that covers the upper end opening of the inner shell and guides exhaust gas to the side. .

[Conventional technology]

FIG. 4 is a sectional view showing a conventional example of this type of heat exchanger.

When this conventional heat exchanger is manufactured using the conventional technology, the inner shell 1 forming the outer casing of the main body is formed into a rectangular cylinder shape by pressing a metal plate, and the joints are swaged or swaged. Brazing is also used.

A large number of fins 4 having pipe insertion holes 4a are housed and temporarily supported in the inner shell 1, and a plurality of heat exchange pipes 3 are inserted into the holes drilled in the cylindrical wall of the inner shell 1 and the fins. Insert into hole 4a.

Then, the cooling pipe 2 is connected to one of the heat exchange pipes 3, and the heat exchange pipes 3 are connected to the U pent 1.
0, and a hot water outlet pipe is connected to one of the heat exchange pipes 3, although not shown.

After the above assembly work, the exhaust port cover 6 is assembled to cover the upper end of the inner shell 1 so as to guide exhaust gas to the exhaust top 5.

To assemble the exhaust port cover 6, a gasket 7 is interposed between the flange 1a formed on the upper end of the inner shell 1 and the flange 6a provided on the exhaust port cover 6, and the gaskets 7 are fastened with fixing screws 8. will be carried out. 9 is a flange fixing plate into which the fixing screw 8 is screwed.

[Problem to be solved by the invention]

When manufacturing a water heater heat exchanger using the conventional technology,
After assembling the components such as heat exchange pipes, fins, and U-vents attached to the inner shell 1, which is the outer casing of this heat exchanger, the exhaust port cover 6 is further applied with the gasket 7 in between and fixed. Since the screws 8 must be tightened, the manufacturing process is complicated, requires a large number of man-hours, and increases costs. Moreover, the heat exchanger assembled in this manner has the risk of gas leaking from the vicinity of the gasket 7.

The present invention has been made in view of the above-mentioned circumstances.

After completing the silver-gold (including brazing) work on the inner shell, which is the outer casing of the heat exchanger, and its attached parts, there is no need to screw the exhaust port cover, and moreover, from near the upper end of the inner shell. It is an object of the present invention to provide a method for manufacturing a water heater heat exchanger without the risk of gas leakage.

[Means to solve the problem]

In order to achieve the above object, the manufacturing method of the present invention extends the upper end of the inner cylinder above the installation location of the heat exchanger, and covers the upper end of the extended part to guide the exhaust gas to the side. The upper exhaust lid is crimped and fixed to the extension of the inner body, and the function of the exhaust port cover in the conventional example (guiding the exhaust to the side) is achieved by the upper exhaust lid and the extension of the inner body. to accomplish.

Next, the characteristics of the method of the present invention will be explained with reference to FIG. 1, which corresponds to one embodiment of the method of the present invention.

Reference numeral 11 designates a rectangular cylindrical inner body, into which the heat exchange pipe 3 is inserted through a pipe attachment hole 11f bored in the cylindrical wall.

Therefore, the heat exchange section is installed near the pipe attachment hole itr mentioned above.

In the method of the present invention, the inner shell is extended above the location where the heat exchange section is installed, and the extension section 11. The three sides of the upper end are bent outward to form a flange 1le-1yl.
form le-2w 1le-3.

The vicinity of the upper end of the other side of the inner shell 11 is cut open to provide an opening lid, and the edge thereof is bent to the outside of the inner shell to form a flange 1ie-1e 1le-2*ll5-3.
form.

On the other hand, an exhaust upper lid 12 is configured to cover the upper part of the inner body 11, and one side of the exhaust lid 12 is extended downward to form a folding plate 12a, and a window-shaped opening 12 is formed therein.
b.

Said flange 111-1 v 11m-2t 1le
-3 through the window-shaped opening 12b, and then open the exhaust upper lid 1.
Place 2 on top of inner M11.

A flange 11°-1, 11°-We 1lc-3 is attached in a shape that wraps around three sides of the exhaust upper lid placed on the inner body 11.
Fold it inward and tighten it, and then tighten the flange 1.
1, -+ * 1ie-2, 11s-3 are folded back to the outside of the opening lid, and the folding down plate 12a is inserted and tightened.

[For production]

According to the above method, it is possible to fix the exhaust top cover that covers the inside upper part without using a gasket or fixing screw.
Since the manufacturing process is simple and requires fewer man-hours, manufacturing costs are reduced.

The upwardly extending portion of the inner shell and the exhaust top cover perform the function of guiding the exhaust to the sides.

Moreover, since no gaskets or fixing screws are used, there is no risk of gas leakage due to aging or stickiness of the gaskets, or loosening of the fixing screws.

〔Example〕

FIG. 1 is an exploded perspective view for explaining one embodiment of the method for manufacturing a water heater heat exchanger according to the present invention; FIG. 2 is a perspective view of the heat exchanger that has been assembled in the above embodiment; Figure 3 is also a sectional view.

11 shown in FIG. 1 is a square cylindrical inner body, and a heat exchange pipe 3
Pipe mounting hole 11. This is provided.

While temporarily holding the fins 4 in the inner shell 1, insert the heat exchange pipe 3 into the pipe attachment hole 11r and the pipe insertion hole 4 of the fin 4.
Insert into a.

The cooling pipe 2 is connected to one of the heat exchange pipes 3, and the heat exchange pipes 3 are connected to each other by a U vent IO.

The inner shell 11 is provided with an extension part 11a that extends above the pipe attachment hole 11r, and three sides of the upper end of the extension part 11a are bent outward to form a flange ttc-,,11°-2°11.
゜-3 is formed.

The above flange 11 (4-It 1lc-2, 11 (4
Open the lid by cutting out the other side of the three sides forming -3.
form. Then, bend the cut edge part to the outside of the inner shell 1 to form a flange l1e-+ l1ie-Z.
Form v 1le-3.

On the other hand, an exhaust upper lid 12 is configured to cover the upper end of the inner body 11, one side of which is bent downward to form a folding plate 12a, and the folding plate 12a has a window shape. An opening 12b is provided.

In this example, the cutout portion of the window-like opening 12b is bent upward to form a folded-up plate 12°. Forming such a fold-up plate 12c is convenient for mounting exhaust system members.

Place the exhaust upper lid 12 on top of the inner shell 11. At this time, the flange 116-It 116-2 + 1l
e-s as a window-like opening 12. Insert into.

Flanges 1tc-, +11(j-
Fold it inward to wrap around the exhaust upper lid 12 at 2t11°-3 and tighten. The crimped state is shown in FIGS. 2 and 3.

Furthermore, a flange 1le-+ that is inserted into the opening 12b
tlle-2t 1le-s to the outside of the opening 12b, and fold down the plate 1 as shown in FIG.
2. Pinch and tighten.

According to the method of this embodiment, the exhaust upper lid, which is a plate-like member that covers the upper end opening of the inner shell 11 and guides the exhaust to the side, can be fixed inside without using a gasket or fixing screw. .

Incidentally, as shown in FIG. 3, it is advantageous to attach slopes O to the upper exhaust cover 12 to improve drainage of rainwater.

When carrying out the present invention, a brazing material may be inserted between the caulked portions and heated to perform brazing.

Next, with respect to an embodiment in which brazing is also used in the above-mentioned crimped portion, points different from the above-mentioned embodiment will be explained.

The inner Jlqll and the exhaust upper lid 12 are made of a heat-resistant copper plate or a copper-plated steel plate, and the above-mentioned heat exchange pipe 3 and the members joined thereto (cooling pipe 2, fins 4, U vent 10, hot water tap) Each flange 11. is constructed by sandwiching a brazing material between the pipe and the inner shell 11) and bending it by applying the present invention. ．． ~11. -3.11. −
A brazing material is inserted into the caulked portion at a temperature of about 11°-3, and these members are passed through a furnace and heated to melt and solidify the brazing material for brazing. Thereby, the exhaust top cover 12 and the inner shell 11 can be brazed in the same process as the heat exchange part brazing process, so the manufacturing process is simple and the manufacturing cost is low. When brazing is used in conjunction with the caulked portion in this manner, the gas leakage prevention effect of the caulked portion becomes even more reliable.

〔Effect of the invention〕

According to the manufacturing method of the present invention, the exhaust top lid that covers the upper end opening of the inner shell of the heat exchanger of a water heater and guides the exhaust gas to the side can be fixed to the inner shell without using gaskets or screws. Can be done.

Since no seals or fixing screws are used, the manufacturing process is simple, requires fewer man-hours, and costs are low.

Furthermore, since no packing or fixing screws are used, there is no risk of gas leakage due to aging or deformation of the packing, and there is no risk of gas leakage due to loosening of the fixing screws.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view for explaining one embodiment of the method for manufacturing a water heater heat exchanger according to the present invention. FIG. 2 is an external view of the water heater heat exchanger manufactured according to the above embodiment, and FIG. 3 is a sectional view of the same. FIG. 4 is a sectional view of a conventional water heater heat exchanger. 2... Cooling gasket, 3... Heat exchange gasket, 4.
...Fin, 10...U vent, 11...Inner body, l
la... extension, 11cm, ~1lc-3"' flange, 11 d... opening, 11e-, ~11.3.
...Flange, 11f...Pipe mounting hole, 12...
Exhaust upper lid, 12a... folding down plate, 12b... window-like opening, 12c... folding up plate.

Claims (1)

[Claims] 1. A rectangular cylindrical inner shell, a heat exchange section installed inside the inner shell, and a member that covers the upper end opening of the inner shell and guides exhaust gas to the side. In the method of manufacturing a heat exchanger for a water heater, the inner shell has a shape extending upward from a location where the heat exchange section is provided, and the three sides of the upper end of the inner shell are directed outward. Bend it to form a flange, cut out the vicinity of the other side to form an opening, and bend the area around the cut opening to the outside of the inner shell to form a flange. A rectangular plate-shaped exhaust upper lid is constructed to cover the upper end opening of the body, and one side of the exhaust upper lid is extended downward in a shape that is folded down, and a window-shaped opening is provided in the folded-down part. Place the upper lid on the inner shell, and insert the flange bent around the cut opening into the window-like opening provided in the fold-down part of the upper exhaust cover, and The flange with three sides of the upper end bent outwards is used to sandwich and tighten the circumference of the exhaust top lid, and the flange inserted into the window-shaped opening of the fold-down portion of the exhaust top lid is folded back to the outside of the opening. A method of manufacturing a heat exchanger for a water heater, characterized in that a folded-down portion is sandwiched between an inner body and crimped.