JPH01184363A - Electric water warmer - Google Patents

Abstract

PURPOSE:To provide an electric water warmer which can always utilize high temperature hot water by means of a low power, by a method wherein hot water heated by a heater situated in a first container is stored in a second container with the aid of a pump. CONSTITUTION:When a temperature by a temperature sensor 3 is below a heat accumulation completion temperature, for example, 80 deg.C, a heater 2 for heating is made to heat water in a first container 1 to 80 deg.C. When water temperature is increased to 80 deg.C or more, the temperature sensor 3 detects the temperature, a signal is sent to a control means 17 to drive a pump 9, water, contained in the first container 1 and heated to 80 deg.C, is fed to a second container 5, and water 7 in the second container 5 is fed to the first container 1 by a quantity equivalent to a quantity of water fed from the first container 1. The fed water is heated by the heater 2 for heating to 80 deg.C again, and the water heated to 80 deg.C is returned to the second container 5. The circulation enables storage of hot water having a temperature of 80 deg.C in the second container 5.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an improvement of an instantaneous electric water heater equipped with a heat storage container.

(Conventional technology) Conventional electric water heaters include instant heating type electric water heaters that heat water with a heater immediately before use, and late-night electric hot water storage type electric water heaters that use late-night electricity to supply hot water. Water heaters are commonly used.

The above-mentioned instantaneous electric water heater can use high-temperature water at any time, but as shown in Figure 4'', when storing hot water in a bath, approximately 185 liters of water at a temperature of 5°C can be stored at 50°C.
When a large amount of hot water is required at once, such as heating to ℃, a heater capacity of approximately 19 kW (30 minutes) is required, which is a large amount of power for household use.

In addition, since the above-mentioned late-night electric hot water storage type electric water heater uses night-time electric power, the peak capacity is approximately 2.5 mm, as shown in Fig. 5.
A low power consumption of 5 kW (8 hours) is sufficient, but additional heat cannot be generated and only the hot water equivalent to the hot water storage container (approximately 3001 J ttle) can be used.

(Problems to be Solved by the Invention) As described above, in the conventional electric water heater, when a large amount of hot water is required per -degree, the heater capacity is large and the electric power is large. It becomes necessary. Furthermore, electric water heaters that use late-night electricity to store hot water cannot provide additional heat, so high-temperature water cannot be used at any time.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an electric water heater that can use high temperature water at any time with low electric power.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, the electric water heater of the present invention includes a first container for heating water, which has a built-in heater, a second container for storing heat, and a second container for storing water from the city water. A water pipe that circulates hot water through the bottom of the second container and the first container and discharges the hot water to the utilization equipment, and a circulation pump that is connected between the inlet side and the hot water outlet side of the water pipe and is driven when heat is stored. It is characterized by

(Function) In the device configured in this way, high-temperature hot water can be used even if the hot water heated by the heater installed in the first container is stored in the second container by the pump. Furthermore, since the power to the heater is always on, it is possible to use hot water with a small amount of electricity.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the structure of an electric water heater according to an embodiment of the present invention. A heater 2 for heating water and temperature sensors 3 and 4 are installed in the first container 1, and a temperature sensor 6 is installed in the second container 5, in which water 7 is stored.

The first container 1 and the second container 5 constitute a closed circuit connected by a water pipe 8, and a pump 9 is installed in the water pipe 8a on one side of this closed circuit. A flow path switching valve 10 is installed in the water pipe 8a between the two containers 5, and a flow path switching valve 11 is installed in the water pipe 8b on the other side of the closed circuit.

A water pipe 8a between the flow switching valve 10 and the second container 5 has a branch water pipe connected to a water pipe 12, and a flow switching valve 13 is installed in this branch water pipe. In addition, there is a branch water pipe connected to the utilization equipment 14 in the water pipe 8a between the first container 1 and the pump 9, and a flow path switching valve 1 is installed in this branch water pipe.
5 is installed. A usage detection sensor 16 is installed in the usage device 14 to detect whether or not it is being used, and signals detected by the usage detection sensor 16 and the temperature sensors 3, 4, and 6 are sent to the control means 17 to control the pump 9 and heating. It is installed to control the heater 2 and flow path switching valves 10, 11, 13, and 15.

Next, the operation modes and effects in this embodiment will be explained with reference to Table 1.

Table 1 The heat storage completion temperature set by the temperature sensor 6 of the second container 5 (
For example, if the temperature is 80"
5 is closed. As a result, a closed circuit circulating water pipe 8 is formed between the first container 1 and the second container 5. If the temperature sensor 3 is below the heat storage completion temperature (e.g. 80°C), the heater 2 is turned on and the water in the first container 1 is heated to 80°C.
Heat to 0°C.

When the water temperature reaches 80°C or higher, the temperature sensor 3 detects the temperature and sends a signal to the control means 17, which drives the power pump 9 to transfer the water heated to 80°C in the first container 1 to the second container. 5, the water 7 in the second container 5 is sent into the first container 1 by the amount sent from the inside of the first container 1. Then, this sent water is heated with heater 2 to 80℃ again,
This 80° heated water is returned to the second container 5. By circulating in this way, 80° 0 hot water can be stored in the second container 5. When the water 7 in the second container 5 becomes hot water of 80° C., a signal is sent from the temperature sensor 6 to the control means 17 in response to the temperature sensor 6, and the control means 17 stops the heater 2 and turns on the pump 9. stops driving and completes heat storage circulation.

In the case of use during heat storage, the operation mode is set to use during heat storage, and the use detection sensor 16 installed in the use equipment 14 uses hot water.
The signal from the usage detection sensor 16 is sent to the control means 17.
The control means 17 closes the flow switching valve 10 and opens the flow switching valves 11, 13, and 15, thereby causing water to flow from the water plumber 2 through the second container 5 to the first container 1. A water flow path is formed through which the water reaches the utilization equipment 14. Note that here water flows (due to the water pressure of the tap). If the temperature sensor 4 of the first container 1 is 80° C. or lower, the heater 2 is turned on to heat the water in the first container 1 to make it hot water to 80° C. for hot water utilization. Temperature sensor 4 of first container 1 is 80°C
If it is below, heating by the heater 2 can be continued and hot water can be utilized. Also, if you stop using it,
The usage detection sensor 16 detects that it is no longer being used, sends a signal to the drive means 17, and the drive means 17 stops the heater 2 and closes the flow path switching valve 15, ending the heat storage usage operation. do. At this time, when the temperature sensor 4 installed in the second container 5 is below the set temperature of 80''C, the heat storage circulation PJ:i3! conversion mode is performed and the water 7 in the second container 5 Heat to 80°C.

In the case of use after the heat storage is completed, the hot water use operation mode is set, and the use of hot water is detected by the use detection sensor 16 installed in the utilization device 14, and a signal is sent from the use detection sensor 16 to the control means 17. The control means 17 closes the flow path switching valve 10 and opens the flow path switching valves 11, 13, and 15, thereby allowing water to flow from the water pipe 12 through the second container 5 and through the first container 1. A water flow path that reaches the utilization device 14 is formed. Note that water flows here due to the water pressure of the tap water. In the post-heat storage utilization operation, the heater 2 is stopped to utilize the hot water heated to 80° C. in the second container 5, and the operation is the same as the above-mentioned heat storage utilization operation.

By operating in this manner, the input to the heater is small, as shown in FIG. And hot water can be used, making it safer.

FIG. 3 is a configuration diagram showing the configuration of an electric water heater according to another embodiment of the present invention. In addition to the configuration of the embodiment shown in FIG. 1, a water-based high-density latent heat storage material 18 and a heat exchanger 19 are installed in the second container 5.

Water flows through the heat exchanger 19, and the pipes at the inlet and outlet of the heat exchanger 19 are connected to the water pipes 8 in the same way as the pipes at the inlet and outlet of the second container 5 in the embodiment shown in FIG. It forms a closed circuit.

The operating mode and operation in this embodiment are the same as those shown in Table 1 and are consistent with those shown in the first embodiment.

A high-density latent heat storage material 1 containing water is placed in a second container 5 for storing hot water.
8, when hot water is obtained, water flows into the heat exchanger 19 like an instantaneous type and removes heat from the latent heat storage material 18 to obtain high-temperature water. Also, here, latent heat storage material 1
8. As a high-density heat storage material, phase change temperature 70°C1 latent heat 4
Since sodium pyrophosphate decahydrate with a density of 6 kcal 7 kg and a density of 1.7 k'; It can be turned into a hut. Furthermore, if a fin heat exchanger is used as the heat exchanger 19, heat conduction within the second container 5 becomes uniform.

In addition to the embodiments described above, the present invention can also be applied to cases in which other high-density heat storage materials are installed in the second container 5 or cases in which other piping routes are provided. Moreover, by installing the pump 9 in the opposite direction, hot water can be stored from the upper part of the second container 5, and can be stored in layers.

〔Effect of the invention〕

According to the present invention, by arranging a heat storage container in the instantaneous electric water heater, high-temperature hot water can be used at any time, and operation can be performed with a small heater input, making it possible to use low power. .

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing the configuration of an electric water heater according to an embodiment of the present invention, FIG. 2 is a situation diagram showing the usage status of the electric water heater according to an embodiment of the present invention, and FIG. A configuration diagram showing the configuration of an electric water heater according to another embodiment of the invention, FIG. 4 is a situation diagram showing the usage status of a conventional instant heating electric water heater, and FIG. 5 is a conventional hot water storage type electric water heater using late-night electricity. It is a situation diagram showing the usage situation of a water heater. 1... First container 2... Heater 3.
4 fists 6... temperature sensor 5... second container 7...
・Water 8...Water pipe line 9...Bon
Fu 10, 11, 13, 15...Flow path switching valve 12...
Water pipe 14... Utilization equipment 16... Utilization detection sensor 17... Control means 18... Heat storage material
19...Heat exchanger agent Patent attorney Nori Chika Norihiro Uji Hiroshi ←-Sumi@Rinkan route◆---Fang 1' route Figure 1 Time bow Figure 2 Figure 3

Claims (1)

[Claims] A first container that heats water and has a built-in heater; a second container that stores heat; and a second container that stores city water.
An electric water heater characterized by comprising: a water pipe that circulates hot water in the order of the containers and discharges the hot water to the utilization equipment; and a circulation pump that is connected between the inlet side and the hot water outlet side of the water pipe and is driven when heat is stored.