JPH09296957A - Antifreezing apparatus for hot water supplier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the amount of heat transfer for each unit area and hence apply an antifreezing device also for a connection piping with less heat insulation. SOLUTION: There is provided a wide area heat transfer plate 3 substantially fitted to a water side body A of a connection piping part of a hot water supplier and joint flanges 1, 2 of a water supply joint B. A heater mount plate C where an antifreezing heater 5 is mounted on a one side vertical plate 4 of the heat transfer plate 3 is mounted between a joint flange 1 of the foregoing water side body A and a joint flange 2 of the water supply joint B, holding the heat transfer plate 3 therebetween for ensurance of a wide heat transmission area.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antifreezing device for a water heater.

[0002]

2. Description of the Related Art In a conventional antifreezing device for a water heater,
As a means for preventing freezing of the connecting piping portion, for example, FIG.
As shown in FIG. 5, the freeze prevention heater 5'is attached and fixed to the side surface portion of the water side body A'or the water supply joint B'of the connection piping portion by the heater fixing plate 6 '.

[0003]

Recently, resin connecting pipes have been used for connecting pipes of water heaters for the purpose of weight reduction and cost reduction. However, in the above-mentioned connection pipe portion of the prior art in which the antifreezing heater 5'is attached and fixed to, for example, the side surface portion of the water-side main body A'or the water supply joint B ', the heat transfer area is small, and therefore the resin-made heater 5'is made of resin. This is not applicable when the connecting pipe is used because the heat may be concentrated on the mounting part and the pipe may be melted or deformed by the heat, and the connecting pipe, for example, the water side body A ′ or the water supply joint. Since the outer shape of B'is uneven, it is necessary to provide a dedicated mounting portion 4 ', and further, there is a problem that it is impossible to effectively prevent freezing because of poor heat conduction.

The anti-freezing device for a water heater according to the present invention solves the above problems and widens the heat transfer area to reduce the amount of heat transfer per unit area, so that it is heat resistant, for example, in a connection pipe made of resin. It is an object of the present invention to provide an antifreezing device for a water heater, which can be applied to connection pipes that are weak in heat.

[0005]

A first antifreezing device for a water heater according to the present invention, which solves the above problems, is provided with an antifreezing heating means at a joint portion of a connection pipe portion of the water heater.
The feature is that the amount of heat transfer per unit area is reduced under a wide heat transfer area. The first anti-freezing device for a water heater of the present invention having the above-mentioned configuration has a small amount of heat transfer per unit area, so that it is weak in heat resistance, for example, even if it is a resin-made connecting pipe, effective anti-freezing is achieved. It is possible.

A second anti-freezing device for a water heater according to the present invention which solves the above-mentioned problems is equipped with an anti-freezing heater, and
A heater mounting plate having a wide area heat transfer plate is attached by sandwiching the heat transfer plate at the joint portion. A second anti-freezing device for a water heater according to the present invention having the above structure,
Since the heat from the antifreezing heater is conducted to the heat transfer plate having a large area of the heater mounting plate and transferred to the connecting pipe, a wide heat transfer area can be obtained and the freezing can be effectively prevented.

A third antifreezing device for a water heater according to the present invention, which solves the above-mentioned problems, has a joint flange having a wide joint area at the joint portion, and an antifreezing heater is provided near the joint flange. Characterize. In the antifreezing device for a water heater according to the third aspect of the present invention having the above-described configuration, the heat from the antifreezing heater conducts heat through the joining flange having a large joining area, so that a wide heat transfer area can be obtained and the freezing effect can be obtained. To prevent it.

According to a fourth aspect of the present invention, which solves the above-mentioned problems, in the anti-freezing device for a water heater of a water heater, when one of the connecting pipes is made of resin, the heat transfer by the anti-freezing heating means is performed by the other metal. It is characterized in that the water in the connection pipe is heated and convected to prevent freezing by moving to the connection pipe made by the manufacturer. In the antifreezing device for a water heater according to the fourth aspect of the present invention having the above configuration, heat transfer from the antifreezing heater to the metal connecting pipe occurs,
Since water in the connection pipes that are vertically connected is convected, freezing can be effectively prevented.

In the fifth aspect of the present invention which solves the above-mentioned problems, in the antifreezing device for a water heater of the water heater, when the connecting pipes are both made of resin, the amount of heat transferred by the antifreezing heating means is applied to the connecting pipes. It is characterized by reducing the load and transferring heat. According to the fifth anti-freezing device for a water heater of the present invention having the above-mentioned configuration, even if the connecting pipe is made of resin that is weak in heat resistance, heat is transferred without damaging the connecting pipe, so that the anti-freezing can be surely performed.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION In a connecting pipe portion of a water heater, a large area of heat transfer that substantially fits, for example, the joint flanges 1 and 2 of the joint portions of the water side body A and the water supply joint B (hereinafter the same in this section). The heater mounting plate C having the plate 3 and the standing plate 4 extending from one side of the heat transfer plate 3 and having the antifreezing heater 5 is provided, and the heat transfer plate 3 of the heater mounting plate C is provided. By sandwiching the joint between the water side body A and the joint flanges 1 and 2 of the water supply joint B, the heat conduction from the antifreezing heater 5 to the connecting pipe portion can be achieved by a large heat transfer area by the joint flanges 1 and 2. The heat transfer amount per unit area is reduced to transfer heat to the water side body A and the water supply joint B. Therefore, for example, it is possible to surely prevent freezing of a connection pipe that is weak in heat resistance, such as a connection pipe made of resin. The heater mounting plate C
The material used is a copper plate with excellent thermal conductivity. Further, if the joint areas of the joint flanges 1 and 2 of the joint portion are widened, a large heat transfer area can be effectively obtained.

When the water-side main body A on the upper side of the connecting pipe is made of resin and the water supply joint B on the lower side is made of metal, heat is transferred from the antifreezing heater 5 to the water supply joint B, and the inside of the connecting pipe is Water convects vertically. Therefore, these freezings are effectively prevented.

When both the water-side main body A and the water supply joint B of the connecting pipe are made of resin, the antifreezing heater 5
The amount of heat transferred from is reduced and the heat is transferred. Therefore, even if the connecting pipes are made of a resin that is weak in heat resistance, they are heat-transferred without damaging them to reliably prevent them from freezing.

Although an example of the embodiment of the present invention has been described above, the present invention is not limited to the embodiment and can be implemented in various forms without departing from the gist of the present invention. Of course.

In order to further clarify the structure, operation and embodiment of the present invention described above, an embodiment in which the antifreezing device for a water heater according to the present invention is concretely described below with reference to the drawings. To do.

[0015]

EXAMPLE An example of applying the present invention to a connecting pipe portion of a water side inlet portion of a water heater (see FIG. 7) is shown in FIG.
4A and 4B, A is a water-side main body, which is provided with a joint flange 1 at its joint portion and is made of resin or metal. Further, B is a water supply joint, which is provided with a joint flange 2 adapted to the joint flange 1 of the water side body A, and is made of metal or resin. Further, C is a heater mounting plate, which is a joint flange 1, 2 of the water side body A and the water supply joint B.
A heat transfer plate 3 having a wide area that substantially conforms to
Is fixed by a heater fixing plate 6, and the heater mounting plate C is made of a material having excellent thermal conductivity such as a copper plate.

The heater mounting plate C is attached by sandwiching the heat transfer plate 3 between the joint flange 1 of the water side main body A and the joint flange 2 of the water supply joint B, and the heater 5 for antifreezing.
The heat transmitted from the heat transfer plate 3 to the water side body A and the water supply joint B via the heat transfer plate 3 has a small heat transfer amount per unit area under the wide heat transfer area of the joint flanges 1 and 2. 1 to 3, the heat transfer plate 3 of the heater mounting plate C is sandwiched between the joint flange 1 of the water side body A and the back cover 7 of the water heater, and the water side body A and the water supply joint B are inserted. 4 are connected via the back cover 7, but in the embodiment of FIG. 4, the joint flange 1 of the water side body A and the joint flange 2 of the water supply joint B are interposed by the heat transfer plate 3 of the heater mounting plate C. And are directly connected.

In the above structure, the water side body A is made of resin, the water supply joint B is made of metal, and the water side body A is placed on the upper side.
When these are connected vertically with the water supply joint B as the lower part, heat from the antifreezing heater 5 moves to the metal water supply joint B via the heat transfer plate 3 and the metal water supply joint B is heated. Therefore, the water in the water side main body A and the water supply joint B is heated and convected in the vertical direction, and the freezing of the connecting pipe composed of the water side main body A and the water supply joint B is efficiently prevented by the heating convection of water.

When both the water-side main body A and the water supply joint B are made of resin, the heat from the antifreezing heater 5 has a large heat transfer area by the joint flanges 1 and 2 via the heat transfer plate 3. In addition, the amount of heat transfer per unit area is reduced to reduce the load and transfer heat to the water side body A and the water supply joint B, and the connection pipe consisting of the resin water side body A and the water supply joint B is heated to ensure freezing. Prevent. The optimum heating temperature for transferring heat to the resin water-side main body A and the water supply joint B without damaging them and preventing freezing is about 40 ° C to 50 ° C.

Next, in the embodiment of FIGS. 5 and 6, the joint area of the joint flange 1 of the water side body A and the joint flange 2 of the water supply joint B is widened to prevent freezing near the joint flanges 1 and 2. A heater 5 for heating, and the heat from the antifreeze heater 5 is applied to the water-side main body A and the water supply joint B to form a large joint flange 1;
The heat transfer amount per unit area is reduced based on the wide heat transfer area of 2 to transfer the heat, and the load is more efficiently reduced. That is, by providing the joining surface 2b for joining in the recessed space 2a of the joining flange 2 of the water supply joint B and adapting the joining surface to the joining flange 1 of the water side body A, the heat transfer area thereof is widened. It is a thing.
Further, in this embodiment, as shown in FIGS. 5 and 6, the antifreezing heater 5 is provided on the side surface of the joint flange 2 of the water supply joint B, or as shown in FIG. 4 of the previous embodiment. As described above, the heat transfer plate 3 of the heater mounting plate C may be sandwiched between the joint flange 1 of the water side body A and the joint flange 2 of the water supply joint B to obtain a large heat transfer area. That is, the back cover is not provided unlike the previous embodiment. Other structures and operations are the same as those of the embodiment shown in FIGS. 1 and 2, and the same parts are designated by the same reference numerals and the description thereof will be omitted.

Although the embodiment described above is an example in which the present invention is applied to the water supply side, it goes without saying that it can be applied to the hot water supply side as well. In the figure, 8 is a water supply connection port of the water supply joint B, 9 is a water tap, 10 is a hot water supply joint, 11 is a gas connection port,
Reference numeral 12 is a water supply pipe to the heat exchanger, 13 is a hot water supply pipe, 14 is an air supply fan, and 15 is an O-ring.

[0021]

In the first antifreezing device for a water heater of the present invention, the amount of heat transfer per unit area is reduced based on the large heat transfer area, so that the heat resistance is weak, for example, the connection pipe made of resin. Even if it is, effective freeze prevention can be performed. Therefore, it is possible to realize the weight reduction and the cost reduction by using the resin connection pipe for the connection pipe of the water heater.

In the second anti-freezing device for a water heater of the present invention, the heat from the anti-freezing heater is conducted to the heat transfer plate having a large area of the heater mounting plate to be transferred to the connecting pipe, so that a wide transfer is achieved. A heat area is obtained, and the amount of heat transfer per unit area is reduced to effectively prevent freezing.

In the third anti-freezing device for a water heater according to the present invention, the heat from the anti-freezing heater conducts heat to the connecting pipe through the joint flange having a large joint area, so that a large heat transfer area is provided. The obtained heat transfer amount per unit area is reduced to effectively prevent freezing.

According to the fourth aspect of the present invention, in the anti-freezing device for a water heater, heat is transferred from the anti-freezing heater to the metal connecting pipe, and the water in the vertically connecting pipe is heated and convected. Therefore, freezing can be effectively prevented.

In the fifth aspect of the present invention, the water pipe antifreezing device for a water heater is weak in heat resistance of the connection pipe, for example, even if it is made of resin, the heat transfer amount per unit area is small due to the large heat transfer area. Therefore, the connection pipes are heated without damaging them to effectively prevent freezing.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of essential parts showing an embodiment of an antifreezing device for a water heater according to the present invention.

FIG. 2 is a sectional view of a main part.

FIG. 3 is a plan view of only the water supply joint.

FIG. 4 is a cross-sectional view of a main part having different joining means.

FIG. 5 is a sectional view of a main part of a different embodiment.

FIG. 6 is a plan view of only the water supply joint.

FIG. 7 is a front view showing an example of a water heater.

FIG. 8 is an exploded perspective view of a main part of a conventional example.

[Explanation of symbols]

A ... Water side main body, B ... Water supply joint, 1 ... Water side main body joint flange, 2 ... Water supply joint joint flange, C ... Heater mounting plate, 3 ... Heat transfer plate, 4 ... Standing plate, 5 ... Freezing prevention heater.

Claims (5)

[Claims] 1. Freezing of a water heater, characterized in that a heating portion for preventing freezing is provided at a joint portion of a connection pipe portion of the water heater to reduce a heat transfer amount per unit area under a large heat transfer area. Prevention device. 2. An antifreezing water heater according to claim 1, wherein a heater mounting plate having a heater for preventing freezing and having a heat transfer plate having a large area is attached by sandwiching the heat transfer plate at the joint portion. apparatus. 3. The freeze prevention device for a water heater according to claim 1, wherein the joint portion is provided with a joint flange having a large joint area, and a freeze prevention heater is provided near the joint flange. 4. When one of the connecting pipes is made of resin,
The antifreezing device for a water heater according to claim 1, 2, or 3, wherein heat transfer by said antifreezing heating means moves to the other metallic connecting pipe to heat and convect water in the connecting pipe to prevent freezing. 5. When both the connection pipes are made of resin,
The antifreezing device for a water heater according to claim 1, 2, or 3, wherein the amount of heat transferred by said antifreezing heating means reduces load and transfers heat to said connecting pipe to prevent freezing.