JPH0375261B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a heat exchanger for an instantaneous gas water heater.

[Conventional technology]

A heat exchanger for a gas water heater is made by rolling a cooling pipe around the outer circumference of a heating cylinder made by rolling a sheet of plate material, and attaching a heat exchange unit made of a finned pipe to the top of the heating cylinder. Generally, the cooling pipe of the shell and the fin pipe of the heat exchange unit are connected.

However, with this method, there is a limit to the bending radius of the cooling pipe due to the manufacturing method, and it is extremely difficult to manufacture a flat heat exchanger.
Moreover, there is a problem in that its manufacture requires skill and a large number of man-hours.

In order to improve these problems of conventional technology,
It has been proposed that a heat exchange unit and a heating cylinder be integrally made in a vertically divided manner using a set of two plates, and that the two be combined to form a heat exchanger (Japanese Patent Publication No. 45-30755). (see official bulletin). That is, in this method, a set of two plates is used, a pipe fitting recess is formed in the center leaving both ends, and both left and right ends of the plates are bent into a U-shape. Attach a fin pipe with fins to the top of the shape,
A cooling pipe bent in the same pattern as the above-mentioned concave strips is fitted into the grooves and fixed by soldering, etc., and both ends of the two plates thus formed are joined by seaming etc. to form a heating cylinder. It constitutes.

[Problem to be solved by the invention]

According to the method shown in Japanese Patent Publication No. 45-30755, a flat heat exchanger can be constructed;
There are cooling pipes only on the front and rear sides, not on both sides, so there is a risk that both sides will be heated. In addition, although the plates for forming the heating cylinder using this method are symmetrical, the shapes of the front and rear sides are different, so the plates for the front and rear sides must be formed and managed separately. No.

The present invention is similar to the conventional example in that the heating cylinder is vertically divided into two parts, but the front side member and the rear side member, which are the two-split heating cylinder constituent members, have exactly the same structure and are different from each other. The cooling pipe can be shared, the cooling pipe is wrapped around the entire circumference of the heating cylinder, and even a novice worker can easily assemble the cooling pipe without using any special tools. It is an object of the present invention to provide a method for manufacturing a heat exchanger, which allows the heat exchanger to be manufactured extremely simply and efficiently.

[Means to solve the problem]

In order to achieve the above objects, the present invention has the following features:
A pair of heating cylinder constituent members vertically divided into two on both side parts, a cooling pipe which is wound around the heating cylinder and bent in advance so as to have an inclination, and a cooling pipe which is fitted into the upper part of the heating cylinder constituent member. The heating cylinder component has a face plate part and a side part with both sides thereof bent in a U-shape, and the face plate part has a part for positioning the cooling pipe on the front side. Ribs for positioning the cooling pipes on the rear surface side are each formed in an inclined shape, and a wrap margin is formed at the end of the side surface portion,
The cooling pipe is inserted into the outer periphery of the heating cylinder structural member with both side surfaces of the pair of heating cylinder structural members wrapped in excess, and the cooling pipe has different ribs on the front side and the back cotton side. After selecting and positioning with respect to the face plate part, both heating cylinder constituent members are expanded to support the front side and rear side cooling pipes on the ribs of the respective face plate parts, and the heating cylinder constituent members of the pair are expanded. The heat exchange unit is fitted and locked onto the upper part of the heat exchange unit, the starting end of the fin pipe of the heat exchange unit and the terminal end of the cooling pipe are connected, and the heating cylinder component and the side surface of the heating cylinder component are connected to each other. It is characterized in that the wrap margin, heating cylinder constituent members, heat exchange unit, etc. are joined together by welding or the like.

[Effect]

Since the heating cylinder components have exactly the same configuration on the front and rear sides, it is possible to share parts and improve productivity, and when assembling the cooling pipe, there is no need to wrap extra parts on both sides. Insert the cooling pipe into the outer periphery of the heating cylinder component in a state where the outer shape is smaller than the normal assembled state, then select and position different ribs on the front side and the rear side, and then heat both sides. Since the body components are expanded and the front and rear cooling pipes are supported on the ribs of each face plate, they can be easily and accurately positioned without using jigs and tools as in the past. The cooling pipe can be temporarily fixed, and after fitting and locking the heat exchange unit in this state, the connection port at the upper end of the cooling pipe and the connection port of the fin pipe are connected, and then the required parts are welded. Heat exchangers can be manufactured extremely simply and efficiently.

〔Example〕

Hereinafter, an example of the implementation of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is an overall perspective view showing an example of a heat exchanger obtained by the present invention, FIG. 2 is an exploded perspective view,
Figure 3 is a front view of the heating cylinder components, Figure 4 is the
5 is a front view taken from the rear side with the left half in cross section, and FIG. 6 is a sectional view taken along the line AA in FIG. 5.

As shown in these figures, the heat exchanger of the present invention includes a pair of heating cylinder constituent members 1, 1 that are vertically divided at both side surfaces, and a heating cylinder that is wound around the heating cylinder and has an inclination. It is comprised of a cooling pipe 2 which is bent in advance, and a heat exchange unit 3 which can be fitted and locked onto the upper parts of the pair of heating cylinder constituent members.

The pair of heating cylinder constituent members 1 have exactly the same configuration on the front side and the rear side, and the face plate portion 1
Side part 1 with a and its lower parts on both sides bent into a U-shape
b, and has a wrapping margin 1 on the edge of the side surface 1b.
It forms c. Further, a fitting recess 1d for the heat exchange unit 3 is formed above the side surface portion 1b, and a flange portion 1e for positioning the heat exchange unit 3 is formed inside the fitting recess 1d. ing. 1f is a flange portion for attaching a heat exchange unit formed by folding the upper end of the face plate portion 1a outward. The face plate portion 1a is formed with ribs for positioning the cooling pipes on the front side and the cooling pipes on the rear side.

That is, the cooling pipe 2 is inclined at a certain angle for draining water, and is wound so as to be in contact with the outer circumference of the heating cylinder, so in the illustrated embodiment, there are three pipes on the front side. There are two ribs on the rear side, and therefore, the aforementioned ribs are formed with three ribs 4a, 4b, 4c for the front side and two ribs 4d, 4e for the rear side.

As mentioned above, the cooling pipe 2 is inclined at a certain angle of inclination, and is wound so as to be in contact with the outer periphery of the heating cylinder at least on the front and rear surfaces, and has a water supply pipe (not shown) at its lower end. A connection port 2a with the heat exchange unit 3 is provided at the upper end, and a connection port 2b with the heat exchange unit 3 is provided at the upper end.

As shown in FIGS. 4 and 5, the heat exchange unit 3 has a number of fin plates 3b fitted to an arbitrary number (five in the illustrated embodiment) of fin pipes 3a, and end plates at both ends. 3c, a desired fin pipe is connected to the outside of the end plate 3c by a U-shaped tube 3d, and a claw part 3e is connected to the heating cylinder at the lower edge of the end plate.
(See FIGS. 2 and 5) is formed by folding. Note that 3g is a connection port with a hot water supply pipe (not shown).

Therefore, in the present invention, the pair of heating cylinder constituent members 1, 1 are made to face each other as shown in FIG. 2 from above. In this way, even if the heating cylinder component 1 has a mounting flange 1f, the cooling pipe can be smoothly inserted. After that, the cooling pipe 2 is attached to the rib 4 on the front side.
Ribs 4 on the rear side on a, 4b, 4c
d and 4e, both heating cylinder constituent members 1, 1 are expanded, and only the wrapping margin 1c is wrapped. In this way, the cooling pipe 2 is placed on the ribs 4a, 4b, 4c on the front side, and on the ribs 4d, 4e on the rear side.

Next, the heat exchange unit 3 is inserted between the pair of heating cylinder constituent members 1, 1, and the end plate 3c is located inside the flange part 1e, and the claws 3e are used to close both sides of the heating cylinder constituent member. In this state, connect the connection port 2b at the upper end of the cooling pipe and the connection port of the fin pipe, and then connect the connection port between the cooling pipe 2 and the heating cylinder component 1 as shown in FIG. By placing copper solder, etc., on the lapped part of the side surface of the heating cylinder component, and at the connection between the heating cylinder component and the heat exchange unit, and passing it through the heating furnace. Weld the whole thing together.

〔Effect of the invention〕

As described above, the heating cylinder component according to the present invention has exactly the same configuration on the front side and the rear side, so parts can be shared and productivity can be improved, and the cooling pipe assembly can be improved. When attaching, it is possible to select and position different ribs on the front and rear sides, so even a novice worker can easily and accurately attach the ribs without using any jigs or tools. By fitting and locking the exchange unit and performing the desired welding, the heat exchanger can be manufactured extremely simply and efficiently.

[Brief explanation of drawings]

FIG. 1 is an overall perspective view showing an example of a heat exchanger obtained by the present invention, FIG. 2 is an exploded perspective view,
Figure 3 is a front view of the heating cylinder components, Figure 4 is the
5 is a front view taken from the rear side with the left half in cross section, and FIG. 6 is a sectional view taken along the line AA in FIG. 5. 1... Heating cylinder constituent member, 1a... Face plate portion, 1b
... Side part, 1c ... Wrap allowance, 1b ... Heat exchange unit fitting recess, 1e, 1f ... Flange section, 4a to 4e ... Positioning rib, 2 ... Cooling pipe, 3 ... Heat exchange unit.

Claims (1)

[Claims] 1. A pair of heating cylinder constituent members vertically divided into two on both side parts, a cooling pipe that is wound around the heating cylinder and bent in advance so as to have an inclination, and a cooling pipe that is bent in advance to have an inclination. The heating cylinder component has a face plate part and a side part whose both sides are bent into a U-shape, and the face plate part has a part for positioning the cooling pipe on the front side. and ribs for positioning the cooling pipes on the rear surface side are each formed in an inclined shape, and a wrapping margin is formed at the end of the side surface portion, so that both side surface portions of the pair of heating cylinder constituent members are overlapped excessively. After inserting the cooling pipe into the outer periphery of the heating cylinder component and positioning the cooling pipe relative to the face plate by selecting different ribs on the front and rear sides, expand both heating cylinder components. The cooling pipes are opened to support the front side and rear side cooling pipes on their respective ribs, and the heat exchange unit is fitted and locked to the upper part of the pair of heating cylinder constituent members, and the fin pipes of the heat exchange unit are fitted and locked. The starting end and the terminal end of the cooling pipe are connected, and the cooling pipe and the heating cylinder component, the lap margin of the side surface of the heating cylinder component, and the heating cylinder component and the heat exchange unit, etc. are joined by welding or the like. A method for manufacturing a heat exchanger for a water heater, characterized by: