JPS623648Y2 - - Google Patents

Description

[Detailed description of the invention] This invention aims to improve thermal efficiency, reduce fuel consumption, and improve the thermal durability of exhaust equipment by lowering exhaust temperature. The heat exchanger is equipped with an exhaust heat recovery type heat exchanger, or the main heat exchanger itself has a larger capacity, and with the adoption of such a configuration, a large amount of In order to suppress the occurrence of combustion troubles due to the condensate being generated dripping into the burner section, etc., a container for receiving the condensate is provided at the lower part of the heat exchanger, and a container for receiving the condensate is provided in the lower part of the heat exchanger. Regarding water heaters equipped with drain discharge channels,
The above-mentioned drain has a high acidity, and the problem of corrosion of parts that arises from treating the wastewater as it is is to be solved rationally and economically through simple modification. have that purpose.

In other words, in a water heater that employs a configuration for improving thermal efficiency as described above, not only does it generate more drain than one that does not employ such a configuration, but the harmful components in the exhaust gas (NOx and SOx) dissolve into the drain, making it highly acidic with a pH of about 2 to 4. If this is discharged as is into the container, discharge flow path, and drain pipes attached to the building structure, the precipitating compounds contained in the drain will adhere to the pipe walls, etc., and this, combined with the fact that they remain, can cause early corrosion and discoloration of components such as the drain pipes.

The water heater according to the present invention has been developed in view of the above-described circumstances, and is characterized in that at least the drain receiving surface of the dish-shaped container is made of an alkaline metal material.

In other words, by constructing the surface of the dish-shaped container, which first receives highly acidic condensate that is generated and drips at the heat exchanger during hot water supply, from an alkaline metal material, the condensate that drips there can be absorbed. When flowing along the surface of the container, it can undergo a neutralization reaction or react with a weakly acidic substance, so after that, there will be no corrosion or discoloration of parts such as pipes used to discharge the drain. Phenomena that lead to deterioration can be sufficiently suppressed, and member durability can be improved. In addition, there is no need to install a special neutralization reaction device, etc., and the structure is simple, such as selecting the constituent material of the dish-shaped container, which is the original component for receiving and discharging the generated condensate. In addition, we have been able to achieve the above effects using economical means that require less investment costs.

In order to prevent the dish-shaped container that receives the drain from obstructing the flow of combustion exhaust gas, the dish-shaped container of the present invention is structured into two stages, and each stage is formed with protruding holes whose positions are shifted from each other. There is.

Next, an embodiment of the present invention will be described in detail based on the drawings. As shown in FIG. 1, in the upper part of the burner 7,
A Finch-Ube type main heat exchanger 1' is arranged with both ends connected to the water supply route 4 and the hot water supply route 8, and the upper part of the main heat exchanger 1' is connected to the flow area of the combustion exhaust gas, and the exhaust heat is Therefore, an exhaust heat recovery type heat exchanger 1 is provided to preheat water for hot water supply, and at the bottom of this exhaust heat recovery type heat exchanger 1, a two-stage upper and lower dish-shaped container 2 is provided to receive the condensate generated therein and dripped.
2', of which a flow path 3 for discharging the receiving drain downward from the bottom of the lower dish-shaped container 2', In a water heater equipped with a suction-type forced exhaust fan 9 in the upper part, the above-mentioned upper and lower two-tiered dish-shaped containers 2 and 2' are constructed as follows.

As clearly shown in Fig. 2, the entire upper dish-shaped container 2 is made of an alkaline metal material such as magnesium, aluminum, or an alloy thereof, and the entire lower dish-shaped container 2' is made of corrosion-resistant material such as stainless steel. The upper dish-shaped container 2, which is made of a metal material, has a plurality of downwardly protruding holes 2 arranged at appropriate intervals vertically and horizontally to allow the receiving drain to flow downward.
A... are integrally stamped and formed, and a plurality of holes are formed in the lower dish-shaped container 2' at appropriate intervals in the vertical and horizontal directions and in a position that is inconsistent with the downwardly protruding hole part 2a... The upwardly protruding holes 2a' are integrally formed by stamping, and the highly acidic drain dripping from the exhaust heat recovery type heat exchanger 1 is received by the upper dish-shaped container 2. its surface 2
After a neutralization reaction occurs when A flows, it is caused to flow down from the protruding holes 2a to the lower dish-shaped container 2' and discharged through the flow path 3, while the combustion exhaust gas is discharged from the protruding holes 2a'. . . . and 2a . . .

In addition, in the present invention, instead of providing the upper and lower dish-shaped containers 2 and 2' as in the above embodiment, only the upper dish-shaped container 2 is installed as shown in FIG. In the case where the drain is collected on one side and discharged, the dish-shaped container 2 is made of the above-mentioned alkaline metal material, or the surface 2A is
It is also possible to implement the method by constructing only the alkaline metal material.

Furthermore, it goes without saying that the present invention can also be applied to a water heater that does not have the exhaust heat recovery type heat exchanger 1.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the water heater according to the present invention, in which FIG. 1 is a schematic longitudinal sectional front view of the whole, FIG. 2 is an enlarged longitudinal sectional front view of the main part, and FIG. , FIG. 4 is an enlarged longitudinal sectional front view of the main parts showing another embodiment. 1, 1'... Heat exchanger, 2... Dish-shaped container (upper side), 2'... Dish-shaped container (lower side), 3... Drain discharge channel, 2A... Surface of 2, 2a... Downward protruding hole portion, 2a′...Upward protruding hole portion.

Claims (1)

[Claims for Utility Model Registration] In a water heater equipped with a dish-shaped container 2 for receiving condensate generated at the heat exchanger 1 or 1', and a flow path 3 for discharging the received condensate, the dish-shaped container At least the drain receiving surface 2A of 2 is formed of an alkaline metal material, and another dish-shaped container 2' made of a corrosion-resistant metal material is provided below the dish-shaped container 2, and these upper and lower dish-shaped containers 2. A water heater characterized in that a plurality of downward protruding hole portions 2a... and upward protruding hole portions 2a'... are formed in positions deviated from each other in 2 and 2'. The water heater according to claim 1, wherein the entire upper dish-shaped container 2 is made of magnesium alloy, and the entire lower dish-shaped container 2' is made of stainless steel. The water heater according to claim 1 or 2, wherein the heat exchanger 1 is an exhaust heat recovery type heat exchanger.