JPH0464861A - Electric hot water heater - Google Patents

Abstract

PURPOSE:To ensure a continuous supply of hot water by a method wherein a first hot water storage tank for receiving water and a second hot water storage tank for feeding are provided, both the tanks are connected by a connecting pipe, each of such tanks has an excessive temperature rise preventing device, a temperature detector and a midnight-operated heater and the first hot water storage tank is provided with a daytime-operated heater for follow-up water heating. CONSTITUTION:The operating temperature of a temperature detector 30 is the same as that of a temperature detector 27 on a midnight-operated heater 26 provided on a first hot water storage tank 23 and, at a point at which the water is boiled by the heater 26, these two temperature detectors 30 and 27 are in an open condition and there are cases where the heater is not energized even when an indication switch 45 stays 'on' during a period of time other than midnight power supply hour. However, when a hot water faucet 39 is opened to use the hot water with the above-mentioned condition retained, a portion of supply water equivalent to the amount of the hot water used is allowed to flow into the first hot water storage tank 23 from below and, at a point at which the temperature detector 30 reaches a closed condition, the energizing of a daytime-operated heater 29 is started for follow-up water heating and continued until the water is boiled in the first hot water storage tank 23 when the temperature detector 30 is opened.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electric water heater that uses both a late-night heater and a daytime heater.

BACKGROUND OF THE INVENTION In recent years, electric water heaters for late-night electricity use have been widely used because of their low running costs. Conventionally, this type of electric water heater generally had a configuration as shown in Japanese Utility Model Application Publication No. 59-65343. The configuration will be explained below with reference to FIG.

As shown in the figure, the water pressure of the water guided through the water supply pipe 1 is automatically regulated by the pressure reducing check valve 2, and then the water is supplied from the water supply pipe 5 to the first hot water storage tank 3 via the lower water supply port 4. , the first hot water storage tank 3 and the second hot water storage tank 6 are connected by a connecting pipe 7. A heater 8 and a temperature detector 9 are provided at the lower part of the second hot water storage tank 6, and a hot water supply pipe 10 is connected to the upper part. A circulation path 11 is installed between the hot water supply pipe 10 and the lower part of the first hot water storage tank 3, and a circulation pump 12 is provided in the circulation path II. Further, the temperature sensor 13 for stopping the driving of the circulation pump 12 is connected to the first temperature sensor 13.
It is attached to the top of the hot water storage tank 3.

To explain the operation in the above configuration, the energization control of the heater 8 provided at the lower part of the second hot water storage tank 6 is performed by the temperature detector 9, and after the hot water is heated to the set temperature, the circulation pump 12 is started. and the first hot water storage tank 3 and the second
The hot water is circulated between the hot water storage tanks 3 and is controlled to stop when the temperature reaches the temperature set by the temperature sensor 13 installed at the top of the first hot water tank 3.

Problems to be Solved by the Invention In such conventional electric water heaters, there is a limit to the amount of hot water that can be used, and there is a problem in that the hot water sometimes runs out. If a large hot water storage capacity is established to deal with this hot water shortage, the amount of hot water used will fluctuate depending on the season, with the amount of hot water used being small in the summer due to high water temperature, and the amount being the largest in the winter. Therefore, the surplus rate increased in the summer, resulting in unnecessary boiling, which was an economic problem.

The present invention solves the above problem, and aims to provide an electric water heater that does not run out of hot water.

Means for Solving the Problems In order to achieve the above object, the present invention provides a first hot water storage tank for supplying water and a second hot water storage tank for discharging hot water, and connects the first hot water storage tank and the second hot water storage tank. The first hot water storage tank and the second hot water storage tank each have an overtemperature rise preventer, a temperature detector, and a late-night heater, and the first hot water storage tank is provided with a daytime heater for additional heating. The structure is as follows.

Effect In the above-described configuration, the hot water in the first and second hot water storage tanks heated by the heater late at night is used in the morning when the amount of water used is relatively low. The daytime heater for reheating installed in the first hot water storage tank is energized from the moment the temperature sensor detects the water temperature, and the energization is stopped when the temperature sensor reaches the set value again. , increase the amount used to guarantee against running out of hot water.

EXAMPLE Hereinafter, an electric water heater according to an example of the present invention will be described with reference to FIG. As shown in the figure, the water supply pipe 21
The water pressure is automatically regulated by a pressure-reducing check valve 22 and then supplied to a water supply port 24 at the bottom of the first hot water storage tank 23 via a connecting pipe 25. At the bottom of the first hot water storage tank 23, a late-night heating tank 26, a temperature detector 27 for controlling the boiling temperature, and an over-temperature rise preventer 28 are installed. 29, a temperature detector 30 for controlling the boiling temperature, and an overtemperature rise preventer 31. Said first hot water storage tank 23
A second hot water storage tank 32 is installed adjacent to the second hot water storage tank 32.
Also at the bottom of the hot water storage tank 32, there is a late-night heater 33,
A temperature detector 34 and an overtemperature rise preventer 35 are equipped to control the boiling temperature. Said first hot water storage tank 2
3 and the second hot water storage tank 32 are communicated with each other by a communication pipe 36, and a hot water supply port 38 is provided at the upper part of the second hot water storage tank 32, and a hot water supply pipe 37 is connected to this.
A hot water tap 39 is installed at the end of the hot water tap 7.

The controller 40 also controls the late-night heaters 26.33 and the daytime heaters 29 for reheating that are installed in the first and second hot water storage tanks 23.32, respectively. It is attached to a part of the exterior material 42 that constitutes the outer shell of. The controller 40 is connected to a remote control 43 that instructs the boiling operation, and an instruction switch 46 that instructs the boiling of only the late-night heater 33 installed in the second hot water storage tank 32, and the first hot water storage tank 23. and a boiling instruction switch 44 for the late-night heaters 26 and 33 installed in the second hot water storage tank 32, and, if necessary, energizing the daytime heater 29 for reheating only outside of the late-night electricity supply hours. An instruction switch 45 that can be specified is provided.

Next, based on Fig. 2, the daytime heater 29 for additional cooking is installed.
The operation will be explained below.

The daytime heater 29 for additional heating can be energized only outside the late-night power supply hours, and has a control configuration in which it is turned on when the temperature detector 30 is in the closed state. The operating temperature of the temperature detector 30 is the same as that of the temperature detector 27 of the late-night heating tank 26 installed in the first hot water storage tank 23,
When boiling is completed by the late-night heater 26, both temperature detectors 30 and 27 are open, and even if the instruction switch 45 is in the rONJ position outside of the late-night power supply hours, energization may not start. However, if hot water is used by opening the hot water tap 39 while maintaining this state, the amount of water used will be reduced to the point at which water flows from the lower part of the first hot water storage tank 23 and the temperature sensor 30 reaches the closed state. From then on, power is started to be supplied to the daytime heater 29 for additional cooking, and the operation starts to boil the inside of the first hot water storage tank 23 until the temperature detector 30 is in the open state.

As described above, according to this embodiment, the independent late-night heaters 26 and 33 are provided in the first hot water storage tank 23 and the second hot water storage tank 32 which are installed side by side and are connected in communication, and By providing daytime heaters 29 for cooking and adding a function to selectively control each one so that they can be turned on and off independently, the amount of boiling can be optimally selected according to the amount used.

Effects of the Invention As is clear from the above embodiments, according to the present invention, a first hot water storage tank for supplying water and a second hot water storage tank for dispensing hot water are provided together, and the first hot water storage tank and the second hot water storage tank are connected to each other. The first hot water storage tank and the second hot water storage tank each have an overheat preventer, a temperature detector, and a late-night heating heater, and the first hot water storage tank has a daytime heater for reheating. By providing a heater, the relatively small amount of hot water used from morning to evening can be reheated to increase the amount of hot water used, thereby eliminating the need for running out of hot water.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of an electric water heater showing an embodiment of the present invention;
FIG. 2 is an operation flowchart of the additional heating heater of the electric water heater of the present invention, and FIG. 3 is a side view of the conventional electric water heater. 23...First hot water storage tank, 26...
Late-night heater, 27.30.34... Temperature detector, 29... Daytime heater, 32...
Second hot water storage tank, 33... Late night heating.

Claims (1)

[Claims] A first hot water storage tank for supplying water and a second hot water storage tank for discharging hot water are provided together, and the first hot water storage tank and the second hot water storage tank are connected by a connecting pipe, and the first hot water storage tank and the second hot water storage tank are Each electric water heater has a temperature overrise preventer, a temperature detector, and a late-night heater, and the first hot water storage tank is equipped with a daytime heater for additional heating.