JP2003262396A - Hot water storage type electric water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot water storage type electric water heater capable of preventing freezing around a circulating pump during infrequent operation of the circulating pump at night (e.g. 23:00 to 7:00) in cold climates, for example and capable of cooling a motor for driving the circulating pump during frequent operation of the circulating pump in the daytime (e.g. 7:00 to 23:00), and to achieve space-saving of the electric water heater. <P>SOLUTION: In the hot water storage type electric water heater, heat medium, like hot water in a bath tub, supplied from outside of a hot water storage tank 1 is circulated by the circulating pump 3 and heated in a heat exchanger 2 arranged in the hot water storage tank 1. A space 4 is formed at the bottom of the hot water storage tank 1, and the circulating pump 3 is arranged in the space 4. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water storage type electric water heater capable of heating (so-called reheating) hot water in the bathtub and heating by hot water in the hot water storage tank, and more particularly to an electric water heater. The present invention relates to a hot water storage electric water heater capable of saving space, easily preventing freezing in the vicinity of a circulation pump even when used in a cold region, and cooling a motor that drives the circulation pump.

[0002]

2. Description of the Related Art Conventionally, a hot water storage type electric water heater of this type has a heater arranged in a tank, a water inlet provided at the bottom of the tank, and a hot water outlet provided at the top of the tank. However, the structure is such that hot water is discharged from the top. In addition, when the bath is reheated or heated, water supplied from the outside of the hot water tank is circulated by a circulation pump to heat the heat exchanger provided in the hot water tank.

[0003] In this hot water storage type electric water heater, the heater is energized by using late-night power, which is generally inexpensive, and when energization of the heater is started, convection of hot water heated by the heater is performed. Due to the action, the water stored in the tank is heated almost uniformly. Then, it is boiled until it reaches a predetermined temperature, and hot water used the next day is stored at night.

[0004]

The circulation pump of the hot water storage type electric water heater is usually arranged in the vicinity of the hot water storage tank or the like. There is a problem that this circulation pump becomes an obstacle when it is desired to increase the volume of the tank. In addition, when the hot water storage type electric water heater is used in a cold region, the water remaining near the circulation pump is used at night when the circulation pump operates less frequently (for example, from 23:00 to 7:00 the following day). Therefore, it is necessary to take measures such as arranging a heater for preventing freezing so that the water will not freeze. On the other hand, during the daytime (for example, 7:00 to 23:00) when the operating frequency of the circulation pump is high, In some cases, the temperature of the motor that drives the circulation pump rises, requiring cooling.

In view of the problems of the above conventional hot water storage type electric water heater, the present invention aims at space saving of the electric water heater and, when it is used in a cold region, for example, the frequency of operation of the circulation pump is low. At night (for example, 23:00 to 7:00 the following day), it is possible to easily prevent freezing around the circulation pump, and on the other hand, during the day when the circulation pump frequently operates (for example, 7:00 to 23: It is an object of the present invention to provide a hot water storage type electric water heater capable of cooling a motor for driving a circulation pump.

[0006]

In order to achieve the above object, a hot water storage type electric water heater of the present invention has a heat exchanger installed in a hot water storage tank, and a heat exchanger such as hot water in a bathtub supplied from the outside of the hot water storage tank. In a hot water storage type electric water heater in which a medium is circulated and heated by a circulation pump, a space portion is formed below the hot water storage tank, and a circulation pump is arranged in the space portion. .

In this hot water storage type electric water heater, since the circulation pump is arranged below the hot water storage tank, it is possible to save space in the electric water heater, and even if the installation space is limited, The volume of the hot water storage tank can be increased. In addition, when the hot water storage type electric water heater is used in a cold district, for example, at night when the circulation pump is infrequently operated (for example, from 23:00 to 7:00 the following day), the hot water in the hot water storage tank is The amount of water used is small and the boiling water in the hot water storage tank can prevent freezing in the vicinity of the circulation pump due to radiation from the high temperature hot water storage tank, while increasing the frequency of operation of the circulation pump. Daytime (for example, from 7:00 to
At 23:00), the amount of hot water used in the hot water storage tank is large and water is supplied to the lower part of the hot water storage tank. Therefore, the motor driving the circulation pump is cooled by radiation from the lower temperature of the hot water storage tank. can do.

In this case, the circulation pump can be arranged on the front side of the hot water storage tank between the water supply pipe and the drain pipe.

As a result, the maintainability of the circulation pump can be improved.

Further, the piping of the circulation pump can be arranged inside the heat insulating material of the hot water storage tank.

This makes it possible to easily prevent the piping from freezing.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a hot water storage type electric water heater of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the hot water storage type electric water heater of the present invention. This hot water storage type electric water heater heats a heat exchanger 2 arranged in a hot water storage tank 1 by circulating a heat medium such as hot water in a bathtub supplied from the outside of the hot water storage tank 1 by a circulation pump 3. Then, a space portion 4 is formed below the hot water storage tank 1, and a circulation pump 3 is arranged in the space portion 4.

A lower heater 5 for warming the water in the hot water storage tank 1 to a set temperature is arranged below the cylindrical hot water storage tank 1. The lower heater 5 heats the water supplied into the hot water storage tank 1 as a whole. Above the lower heater 5, the water is heated while convection flows, while the lower heater 5 is heated.
Below, there is no convection of water and relatively low temperature water is pooled.

Further, the hot water storage tank 1 is provided with a water supply pipe 6 and a drainage pipe 7 at the bottom position thereof, and a hot water discharge pipe 8 at the upper position thereof. By supplying water from the water supply pipe 6, the hot water storage tank 1
The inner hot water is pushed up so that the hot water is discharged from the hot water discharge pipe 8.

The heat exchanger 2 is composed of a spirally formed pipe and is arranged above the hot water storage tank 1. This heat exchanger 2
Is connected to a bathtub (not shown) via two pipes 9 and 10, and hot water in the bathtub circulates between the bathtub and the heat exchanger 2. In this case, the circulation of the hot water between the bathtub and the heat exchanger 2 is performed by the circulation pump 3, whereby the hot water in the bathtub is reheated.

On the other hand, the circulation pump 3 is arranged in a V-shape on the front side of the hot water storage tank 1 in a space 4 formed by supporting the hot water storage tank 1 at a predetermined height by the legs 11. It is disposed so as to be located between the water supply pipe 6 and the drainage pipe 7. The piping 9 of the circulation pump 3 has a heat insulating material 12 that surrounds the outer periphery of the hot water storage tank 1 together with the cover 13.
Is arranged inside.

Thus, in the hot water storage type electric water heater of the present embodiment, since the circulation pump 3 is arranged below the hot water storage tank 1, it is possible to save the space of the electric water heater and the installation space. Even if the limit is limited, the volume of the hot water storage tank 1 can be increased. Further, this hot water storage type electric water heater is used at night (for example, at 23:00) when the circulation pump is infrequently used, for example, when used in a cold region.
~ 7:00 of the next day), the amount of hot water in the hot water storage tank 1 is small, and the boiling water in the hot water storage tank 1 causes the radiation from the lower part of the hot water storage tank 1 to cause the radiation to occur in the vicinity of the circulation pump 3. Can be prevented from freezing, while the operating frequency of the circulation pump 3 is high during the daytime (for example, 7:00 to 23:00).
Since a large amount of hot water is used in the hot water storage tank 1 and water is supplied to the lower portion of the hot water storage tank 1, a motor for driving the circulation pump 3 by radiation from the lower portion of the hot water storage tank 1 having a relatively low temperature. Can be cooled. By disposing the circulation pump 3 on the front side of the hot water storage tank 1 between the water supply / drain pipes 6 and 7, the maintainability of the circulation pump 3 is improved and the pipe 9 of the circulation pump 3 is stored. By disposing the heat insulating material 12 inside the tank 1, it is possible to easily prevent the piping 9 from freezing.

Although the embodiment of the present invention has been described above, the hot water storage type electric water heater of the present invention is not limited to the description of this embodiment. For example, the heat obtained by the heat exchanger is heated. For example, the configuration of the hot water storage type electric water heater of the present invention can be appropriately changed without departing from the spirit thereof.

[0020]

According to the hot water storage type electric water heater of the present invention, since the circulation pump is arranged below the hot water storage tank, it is possible to save the space of the electric water heater and to save the installation space. Even if it is limited, the volume of the hot water storage tank can be increased and a compact hot water storage type electric water heater can be provided. In addition, for example, when the hot water storage type electric water heater is used in a cold region, the circulation pump is infrequently operated at night (e.g.
In 0), the amount of hot water used in the hot water storage tank is small, and the boiling of the hot water in the hot water storage tank can prevent freezing in the vicinity of the circulation pump due to radiation from the lower hot water storage tank, On the other hand, during the daytime when the circulation pump operates frequently (for example, from 7:00 to 23:00), the amount of hot water used in the hot water storage tank is large and water is supplied to the lower part of the hot water storage tank. The motor driving the circulation pump can be cooled by the radiation from the lower part of the hot water storage tank having a low temperature, and the hot water storage type electric water heater with high thermal efficiency can be provided.

By disposing the circulation pump on the front side of the hot water storage tank between the water supply pipe and the drain pipe, the maintainability of the circulation pump can be improved.

By arranging the piping of the circulation pump inside the heat insulating material of the hot water storage tank, it is possible to easily prevent the piping from freezing.

[Brief description of drawings]

FIG. 1 is a front perspective view showing an embodiment of a hot water storage type electric water heater of the present invention.

FIG. 2 is a side perspective view of the same.

FIG. 3 is a perspective view of the same plane.

FIG. 4 is a front view of the same.

[Explanation of symbols]

1 hot water storage tank 2 heat exchanger 3 circulation pumps 4 space 5 Lower heater 6 water pipe 7 drainage pipe 8 Hot water pipe 9 piping 10 piping 11 legs 12 Insulation 13 cover

Continued front page    (72) Inventor Kyosuke Fujiwara             4-5-11 Higashiota, Ibaraki City, Osaka Prefecture             Hitachi Air Conditioning System Ibaraki Factory (72) Inventor ▲ Kuwa ▼ Katsuya Ki             4-5-11 Higashiota, Ibaraki City, Osaka Prefecture             Hitachi Air Conditioning System Ibaraki Factory F term (reference) 3L025 AC04 AC05 AD07 AD10                 3L036 AB09

Claims (3)

[Claims] 1. A hot water storage type electric water heater in which a heat exchanger such as a hot water tank supplied from outside the hot water tank is circulated by a circulation pump to heat the heat exchanger arranged in the hot water tank. 2. A hot water storage type electric water heater, wherein a space portion is formed below the hot water storage tank, and a circulation pump is disposed in the space portion. 2. The circulation pump on the front side of the hot water storage tank,
The hot water storage type electric water heater according to claim 1, wherein the electric water heater is arranged between the water supply pipe and the drainage pipe. 3. The hot water storage type electric water heater according to claim 1, wherein the piping of the circulation pump is arranged inside the heat insulating material of the hot water storage tank.