JPH0673652U - Electric water heater - Google Patents

Abstract

(57) [Summary] [Purpose] To occupy less space and improve cooking efficiency. [Structure] A plurality of vacuum double containers 2 and 3 having built-in electric heaters 11 and 12 are used. The water supplied into the vacuum double containers 2 and 3 is heated to a predetermined temperature by the electric heaters 18 and 19 to become hot water. The hot water is pushed up in the vacuum double containers 2 and 3 by tap water supplied from below and is discharged. When the hot water becomes insufficient, the electric heater 19 replenishes the water in the vacuum double container 3.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electric water heater.

[0002]

[Prior art]

 Conventionally, there is an electric water heater in which a heater is provided above and below a large tank so that water is supplied from below and hot water is discharged from above. In such an electric water heater, the lower heater is used to heat the water using midnight electric power, which is very cheap, and keeps it warm so that the hot water can be used as needed. If hot water is insufficient, the upper heater partially heats the water in the tank so that it can be used.

[0003]

[Problems to be solved by the device]

 However, the electric water heater is composed of one large tank, and in order to keep the heated water warm, it is necessary to cover the outer circumference of the tank with a heat insulating material such as glass wool. Therefore, there is a problem that the whole volume becomes large and the installation place is restricted. In addition, even in the case of additional cooking, since a large amount of water is heated, it is very inefficient and power consumption increases. The present invention has been made in view of the above problems, and an object thereof is to provide an electric water heater that occupies a small space and can improve cooking efficiency.

[0004]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention comprises a plurality of vacuum double containers each having an electric heater built therein, the inner container and the outer container. Further, it is composed of a plurality of inner containers containing an electric heater and an outer container accommodating the inner containers, and a space formed by the inner container and the outer container is evacuated. Then, one of the inner containers has a smaller capacity than the other inner container, and the electric heater built in the inner container having the small capacity is used for daytime and late-night power, while the electric heater of the other inner container is used. It may be used only for midnight power.

[0005]

[Action]

 In the electric water heater configured as described above, tap water is supplied to each vacuum double container or inner container from below. The supplied water is heated to a predetermined temperature by an electric heater and becomes hot water. This warm water is pushed up and discharged by tap water supplied from below. When the hot water becomes insufficient, the water in any one of the containers is driven by an electric heater to cook the water.

[0006]

【Example】

 Next, an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows a schematic diagram of an electric water heater. Inside a box-shaped water heater body 1, there are four large containers consisting of three large containers 2 with a capacity of 100 liters and a small container 3 with a capacity of 80 liters. It is housed. These containers 2 and 3 are so-called vacuum double containers, and are composed of an inner container 4 and an outer container 5, as shown in FIG. The mouths 4a, 5a of both containers 4, 5 are joined via a connecting ring 6, and the space formed between the inner container 4 and the outer container 5 is evacuated to a vacuum. The large container 2 is arranged with the mouths 4a and 5a facing downward, the small container 3 is arranged with the mouths 4a and 5a facing upward, and the mouth 4a of the inner container 4 is closed by a lid 7. A water supply nozzle 8 is attached to the lid 7, and a drainage nozzle 9 is attached to the opposite side so as to penetrate the vacuum space. Note that the small container 3 has this structure in consideration of installation of a heater and a sensor, but it may have the same structure as the large container 2 in consideration of heat retention performance.

The respective containers 2 and 3 are connected in parallel between a water supply pipe 11 provided below and a drain pipe 12 provided above. The same amount of water is supplied from the water supply pipes 11 connected in parallel to each of the large containers 2 and the small containers 3, and the same amount of water is discharged from the containers 2 and 3 to the drain pipe 12. The drain pipe 12 is provided with a first temperature sensor 14 in the vicinity of a connection portion 13 with the indoor pipe. In addition, the vicinity of the connecting portion 13 becomes a merging portion 15 so that the warm water from the large container 2 and the small container 3 join together. Further, a first opening / closing valve 16 is provided in the middle of the pipe between the confluence part 15 and the large container 2 (near the confluence part 15), and a second opening / closing valve 16 is provided in the middle of the pipe between the confluence part 15 and the small container 3. Open / close valves 17 are provided respectively.

A heater 18 (with an output of 1 to 2 kw) dedicated to late-night power is provided at the bottom of each large container 2, and a heater 19 (0.5 to 1 kw) for both late-night and daytime power is provided above the small container 3. Each of them is provided so that the tap water stored inside can be heated. Further, a second temperature sensor 20 is arranged in the upper part of the small container 3.

In the electric water heater having the above configuration, tap water is supplied from below into each container 2, 3 via the water supply pipe 11, and each container 2, 3 is filled with water to use the midnight power. The tap water stored in the heaters 18 and 19 is heated by. Then, when the first on-off valve 16 and the second on-off valve 17 are opened and the faucet on the indoor side (not shown) is opened, the hot water in the containers 2 and 3 is pushed up by the water pressure of the tap water to supply the hot water.

Then, when 80 liters of warm water is consumed in each of the containers 2 and 3, that is, 320 liters of hot water in total is consumed and the cold water rises above the small container 2 (state shown in FIG. 1), the second The temperature sensor 20 detects this and closes the second opening / closing valve 17 by the function of a control circuit (not shown). Usually, a family of four with 320 liters is considered to be sufficient for daily use of hot water, but if there is a shortage, continue supplying hot water only with large container 2 to make a further 60 A liter of hot water can be supplied.

In consideration of the case where 380 liters or more of hot water is required, the water in the small container 2 is additionally cooked and heated by the heater 19 while the hot water is being supplied only to the large container 2. You may keep it. In this way, the additional hot water is usually required during the time when the electricity charge does not become low. Therefore, by heating with the additional heating heater 19 provided in the small container 2, the minimum required hot water can be obtained. Therefore, it is possible to obtain unnecessary power consumption. When the hot water in the small container 2 is used for additional cooking, the first opening / closing valve 16 may be closed and the second opening / closing valve may be opened.

In the above embodiment, each of the containers 2 and 3 is a vacuum double container, but as shown in FIGS. 3 and 4, an outer container may be shared. That is, in FIG. 3, four inner containers 14 are arranged side by side, and a water supply nozzle 9 and a drainage nozzle 10 are provided above and below each inner container 4, respectively, which are not shown in FIG. Similarly, they are connected to the water supply pipe 11 and the drain pipe 12, respectively. The outer container 21 has a substantially rectangular parallelepiped shape, and a thin metal plate having a plurality of through holes 22a or a heat insulating material, for example, a reinforcing wall 22 made of glass wool or the like is disposed between the inner containers 4. The outer edge portions are in contact with the facing side surface and the upper and lower surfaces, respectively. This prevents the outer container 21 from being deformed when a vacuum is drawn through the exhaust port 23. As described above, according to the electric water heater shown in FIGS. 3 and 4, the water heater main body 1 as in the above-described embodiment is not necessary, and the appearance can be improved at low cost.

Further, in the above-mentioned embodiment, the hot water is supplied from each container 4 at a time, but it is also possible to supply the hot water as shown in FIG. That is, in the structure shown in FIG. 5, the containers 4 are connected in series, and cold water enters by water pressure as shown by the arrow, and hot water in the containers 4 is sequentially discharged from the drain pipe side. It has become.

Furthermore, in addition to this, a temperature sensor and an on-off valve may be provided for each container. According to this, the opening / closing valve of any one container is opened, and when the hot water in this vacuum double container is used up, the temperature sensor detects this and closes the opening / closing valve, and the other vacuum double container is opened. By opening the on-off valve of, the hot water can be supplied sequentially.

[0015]

[Effect of device]

 As is apparent from the above description, the electric water heater according to the present invention is configured with the vacuum double container, so that the heat retaining property is improved and the conventional heat insulating material such as glass wool is not required. Instead, it is very compact. Further, since the vacuum double container having a plurality of small capacities is used, it can be placed in a place where the conventional arrangement cannot be made, such as under the eaves and the attic, so that there are less restrictions on the place of arrangement. Furthermore, even in the case of additional cooking, it is sufficient to heat a small amount of water in one vacuum double container, which is more efficient than the conventional one. Furthermore, by simply changing the number of containers, it is possible to flexibly respond to the amount of hot water required by each household. Also, if the outer container of each inner container is shared, only one outer container is required, and a separate member for covering each container is not required, and it is possible to provide a product with an excellent appearance at a low cost. It will be possible.

[Brief description of drawings]

FIG. 1 is a schematic diagram of an electric water heater according to an embodiment.

FIG. 2 is an enlarged cross-sectional view of the container shown in FIG.

FIG. 3 is a schematic view of an electric water heater according to another embodiment.

FIG. 4 is a plan sectional view of FIG.

FIG. 5 is a diagram showing another piping method.

[Explanation of symbols]

2 ... Large container, 3 ... Small container (above, vacuum double container), 4 ...
Inner container, 5 ... Outer container, 18, 19 ... Electric heater.

Claims (3)

[Scope of utility model registration request] 1. An electric water heater comprising a plurality of vacuum double containers each having an electric heater and including an inner container and an outer container. 2. A plurality of inner containers containing an electric heater,
An electric water heater comprising an outer container that accommodates these inner containers, and a space formed by the inner container and the outer container is evacuated. 3. One of the inner containers has a smaller capacity than the other inner container, and an electric heater built in the inner container of the small capacity is used for daytime and late-night power, while the other inner container has a smaller capacity. The electric water heater according to claim 1 or 2, wherein the electric heater is dedicated to late-night power.