JPH09303879A - Heat exchanger for hot water supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger for a hot water supply device which can be always used at ease without a fear such as breakage or abnormal heating. SOLUTION: A heat exchanger for a hot water supply device comprises hot water supply pipes 9 communicating with a hot water passage 5 and circulating pipes 10 communicating with a circulating passage 8 which are vertically provided in parallel and in a plurality of rows in the same fin 11, the hot water supply pipes 9 being provided in the lower side of a burner and the circulating pipes 10 being provided in the upper side of the burner, and guide plates 12 raised from the fin 11 for guiding hot air outside the circulating pipes 10 and in such a direction as to be separated from the circulating pipes 10. Thus, during an individual hot water supply operation, the circulating pipes 10 are prevented from being abnormally heated and the hot water supply device can be always used at ease without inconveniences such as a breakage or heating of remaining water.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water heater for heating circulating hot water for bathing or heating, and for heating tap water to let hot water flow out from a hot water inlet such as a hot water tap or a shower head. Of the heat exchanger of.

[0002]

2. Description of the Related Art Conventionally, in this type, as disclosed in, for example, JP-A-6-34199,
It has a hot water supply pipe and a circulation pipe that are arranged side by side, and the lower hot water supply pipe is thicker than the circulation pipe. It was to prevent that.

[0003]

However, since the hot-water supply pipe is thick, the conventional hot-water supply pipe has a problem that the temperature rise of the hot-water supply is slow and it takes time to obtain the hot-water supply at the set temperature. When the pipe is not empty and contains bath water or the like, the circulation pipe is also strongly heated by the hot water supply alone operation, and the bath may boil up without knowing it.

[0004]

The present invention focuses on this point and solves the above-mentioned drawbacks. Therefore, in particular, the structure is such that a hot water supply pipe communicating with a hot water supply passage and a circulation pipe communicating with the circulation passage are vertically arranged. In parallel with the same fin in a plurality of rows in parallel, the lower side of the burner side is the hot water supply pipe and the upper side is the circulation pipe, and the outside of the circulation pipe is The inclined hot guide plate guides the rising hot air away from the circulation pipe by raising it from the fins.

[0005]

When the hot water supply operation is performed independently, the hot air after heating the hot water supply pipe 9 tries to heat the upper circulation pipe 10.
A slanted guide plate 12 is formed outside the circulation pipe 10 so as to stand up from the fins 11, so that most of the hot air is guided by the guide plate 12 and is heated upward without directly heating the circulation pipe 10. Since it escapes, it is possible to reliably prevent a problem caused by unnecessary heating of the circulation pipe 10.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A heat exchanger for a water heater according to the present invention will be described below with reference to an embodiment shown in the drawings. Reference numeral 1 denotes a vaporizing burner which uses petroleum as a fuel, and is provided below a drum 2 which constitutes a combustion chamber.

Reference numeral 3 denotes a one-can two-circuit type heat exchanger which is provided on the upper portion of the drum 2 and is heated by the burner 1. The hot water supply passage 5 connecting the city water to the hot water tap 4 and the water in the bathtub 6 are connected. Is connected to a circulation path 8 that circulates the liquid by driving the circulation pump 7.

The heat exchanger 3 is constructed such that the hot water supply pipe 9 connected to the hot water supply passage 5 and the circulation pipe 1 connected to the circulation passage 8 are connected.
0 and a number of common fins 11 are arranged side by side in a vertical dalma shape,
It is constructed by arranging these in a staggered two-step form and brazing them together.

Further, the lower part of the burner 1 side is a hot water supply pipe 9, the upper part is a circulation pipe 10, the hot water supply pipe 9 has a larger diameter than the circulation pipe 10, and the circulation pipe 10 is directly heated by hot air from below. Is to be suppressed as much as possible.

In addition, between the circulation pipes 10 in the lower stage, inclined guide plates 12 for guiding the hot air rising between them in a direction away from the circulation pipe 10 are formed upright from the fins 11 and formed on both sides. The guide plate 12 forms a "C" shape, and the flow of hot air from the side to the circulation pipe 10 is blocked, and the hot air is once focused and then passed to the hot water supply pipe 9 in the upper stage. The circulation pipe 10 is heated by conduction heat from the fins 11 and the hot water supply pipe 9 as much as possible.

Reference numeral 13 denotes a main body frame which houses the above-mentioned respective parts.

Further, the hot water supply passage 5 and the circulation passage 8 are wound around the outer periphery of the drum 2 by brazing so as to cool the drum 2, and the passages 5 and 8 are connected to the bypass pipe 1 after the heat exchanger 3.
4, the hot water supply path 5 and the bathtub 6 can be filled with hot water.

Next, the operation of this embodiment will be described. During the hot water supply independent operation, even if the circulation pipe 10 is empty or there is bath water, the large-diameter hot water supply pipe 9 and the guide plate 1
Since the circulation pipe 10 is prevented from being directly heated by the hot air at 2 and 3, it is possible to reliably prevent the damage of the heat exchanger 3 and the trouble of boiling up the bath without knowing it. The hot air is once converged by the V-shaped guide plate 12 and then concentrated and supplied to the upper hot water supply pipe 9, so that the thermal efficiency can be improved.

During the bath operation, the circulating pipe 10 can obtain a sufficient amount of heat necessary for heating the bath by the conduction heat from the fins 11 and the hot water supply pipe 9, and the conventional bath operation can be performed.

In this embodiment, the circulation path 8 is a circulation circuit for reheating the bathtub 6, but the circulation circuit is not limited to this and may be a circulation circuit for heating.

[0016]

In summary, the present invention is one in which a hot water supply pipe communicating with the hot water supply passage and a circulation pipe communicating with the circulation passage are vertically arranged side by side in parallel in a plurality of rows of the same fin. The lower side of the burner side serves as a hot water supply pipe and the upper side serves as a circulation pipe, and the hot air rising outside the circulation pipe is inclined to guide it away from the circulation pipe. Since the guide plate is formed by raising it from the fins, the circulation pipe is heated and the heat exchanger is damaged when the hot water is operated independently, or the circulation path is heated and the bath is heated or heating is performed without knowing it. It is possible to reliably prevent problems such as breaking, and it is always possible to use with peace of mind. Further, since the structure only needs to raise the fin end, it is extremely simple and can be provided at a low cost.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of a water heater with an embodiment of the present invention.

FIG. 2 is a sectional view of the heat exchanger.

FIG. 3 is an enlarged sectional view of the main part.

[Explanation of symbols]

 1 burner 3 heat exchanger 5 hot water supply passage 8 circulation passage 9 hot water supply pipe 10 circulation pipe 11 fins 12 guide plate

Front Page Continuation (72) Inventor Keno Tomita 7-7 Higashishinbo, Sanjo City, Niigata Prefecture Corona Co., Ltd. (72) Inventor Hideo Imai 7-7 Higashishinbo, Sanjo City, Niigata Prefecture Corona Co., Ltd.

Claims (3)

[Claims] 1. A hot water supply pipe communicating with a hot water supply passage and a circulation pipe communicating with the circulation passage are arranged in parallel in a vertical direction, and the pipes are provided in parallel in a plurality of rows of the same fin. The lower side of the Na side is the hot water supply pipe and the upper side is the circulation pipe, and the inclined guide plate for guiding the rising hot air to the outside of the circulation pipe away from the circulation pipe is provided with fins. A heat exchanger for a water heater characterized by being started up and formed. 2. The heat exchanger for a water heater according to claim 1, wherein the guide plate is formed in a "C" shape between adjacent circulation pipes. 3. The heat exchanger for a water heater according to claim 1, wherein the lower hot water supply pipe has a larger diameter than the upper circulation pipe.