JPS5930833Y2 - Heat exchanger - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a heat exchanger used in water heaters and the like.

As shown in FIG. 1, a conventional heat exchanger is a cylindrical body in which a finned water pipe 1 is arranged at the upper end opening, and a plurality of main burners 2 are arranged at the lower end opening. Usually, the cross section of the upper end opening is smaller than the cross section of the lower end.

This is done to increase the flow velocity of combustion exhaust gas passing between the fins to improve heat exchange efficiency, and to prevent the connecting portions at both ends of the water pipe 1 passing through these fins from protruding from the body of the heat exchanger. This is to reduce the size of the device.

However, in this type of heat exchanger, the reduced cross-section parts 3, 3 in the upper part of the cylindrical body are more severely deteriorated than other parts, and the durability of the heat exchanger as a whole is low.

This means that the combustion exhaust from the main burners 2, 2 is
, 3 directly and cause that part to become abnormally high temperature.

An object of the present invention is to prevent combustion exhaust from directly hitting the inner surface of the reduced cross-section portion in order to improve the durability of the heat exchanger.

A technical means of the present invention for solving the above problem is that a patch plate is attached to almost the entire inner surface of the reduced cross-section portion.

According to the above technical means, the combustion exhaust from the main burner collides with the caul plate and does not directly hit the inner surface of the reduced cross-section portion of the cylindrical body, so the reduced cross-section portion is abnormally heated due to the insulation effect of the caul plate. No worries.

The present invention has the following unique effects.

Since the reduced cross-section portion of the cylindrical body does not reach an abnormally high temperature, deterioration of the reduced cross-section portion is suppressed, and the durability of the heat exchanger as a whole is improved.

Furthermore, since a patch plate is attached to the reduced cross-section portion, the mechanical strength of this portion is improved.

Next, the embodiments of the present invention described above will be described in detail with reference to the drawings.

In this embodiment, as shown in FIGS. 2 and 3, the reduced cross-section parts 3, 3 are located on the left and right sides of the heat exchanger, and the body part 4 is wound around and raised. The downstream end of the water pipe 5 is
It passes through and reciprocates between a large number of fins 6.6 arranged at the upper end opening of the heat exchanger.

Therefore, the space in the upper part of the reduced cross-section portions 3, 3 is
．． 6 are bent communication portions 7, 7 of the water pipe 5 that reciprocates through the water pipe 5.

In addition, a patch plate 8 is provided on the inner surface of the entire area of the reduced cross-section portions 3, 3.
, 8 are attached, and in some cases, it also functions as a reinforcing circumference plate when fixing the heat exchanger inside the device.

In the heat exchanger of the above embodiment, the combustion exhaust gas from the lower main burner 2.2 rises inside the heat exchanger and reaches the fins 6.6, but the combustion exhaust gas rising at both ends has a reduced cross section. Part 3, 3
After colliding with the backing plates 8, 8 attached to the fins 6.6.

Therefore, the high-temperature combustion exhaust does not directly collide with the reduced cross-section portion, the temperature rise in this portion is suppressed, and the temperature difference with the vicinity thereof is also reduced.

Therefore, the durability of the reduced cross-section portions 3, 3 is improved, and the life of the heat exchanger is extended.

The heat exchanger is usually made of a material with high thermal conductivity, such as copper, but the backing plates 8, 8 are preferably made of a material with high heat resistance, such as stainless steel plates.

However, experiments have shown that even when the backing plates 8, 8 are made of the same material as the heat exchanger constituent material, such as copper, the durability is sufficiently improved compared to the conventional one.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a conventional example, Fig. 2 is a sectional view of an embodiment of the present invention, and Fig. 3 is a plan view thereof.
・・Reduced cross-section part, 6, 6... Fin 8, 8...
...Packing board.

Claims (1)

[Scope of utility model registration request] A fin 6.6 through which the water pipe 5 passes is disposed in the upper end opening of a cylindrical body having a cross-section reduced part at the top, and main burners 2, 2 are disposed in the lower end opening of the cylindrical body. A heat exchanger in which a patch plate is attached to almost the entire inner surface of the reduced cross-section portion.