JPH0345225A - Electric water boiler - Google Patents

Abstract

PURPOSE:To maintain the same temperature of hot water whenever the hot water is served after boiled by providing a hot water temperature detecting part in a water tube, and controlling the hot water service system so that the hot water is returned to a vessel via a selector valve in a flow passage when the temperature is equal to or less than the predetermined level, and delivering the hot water from a service outlet when the temperature is above the predetermined level. CONSTITUTION:The delivery port of a pump 5 is continuous to a selector valve 10 via a water tube 5, and branched into water tubes 11 and 12 at the selector valve 10. The water tube 11 is continuous to the introduction outlet 13 of a vessel body, and the other water tube 12 is continuous to the upper part of the vessel 1. A hot water detecting part 14 for detecting the temperature of the hot water within the water tube 9 is fitted to a connection pipe 15 for connecting the pump 5 to the water pipe 9. A circuit part 16 controls the function of the whole of the vessel 1. When a liquid in the vessel 1 is heated and a water service operation part 8 is operated for feeding a hot liquid in an insulated condition after boiling, the circuit part 16 controls the selector valve 10 when the temperature is equal to or below the predetermined level, as the temperature of the hot liquid in the tube 5 is detected with a hot water temperature detecting part 14. consequently, the liquid in the water tube 5 is returned to the vessel 1 for circulation. Also, when the temperature becomes above the predetermined level, the selector valve 10 is controlled with the circuit part 16 for delivering the liquid in the water tube 9 and the vessel 1 through the introduction outlet 13.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electric water heater that heats and retains the temperature of a stored liquid and is equipped with hot water dispensing functions.

2. Description of the Related Art Conventionally, in this type of electric water heater, as shown in FIG.
The liquid was sucked in through a suction port 20, and the liquid was led out of the container through a water pipe 22 that communicated with the pump 18 and a discharge port 21 to the outside of the container.

Problems to be Solved by the Invention In such a conventional configuration, even if water is poured into the container 17 and the electric water heater is energized, the conditions for heating or keeping warm the water in the container 17 and the water in the water pipe 22 are different. are different,
There is a difference in the temperature of hot water from the first time, which contains hot water in the water pipe 22, and the second time, which does not, and the first time the hot water temperature is low, and it is difficult to remove the limescale odor from the water in the water pipe 22. There was a problem that it could not be done.

The present invention solves the above problems, and no matter when the hot water is tapped after boiling, the hot water temperature can be kept almost the same.
Another object of the present invention is to provide an electric water heater that can reduce limescale odor and improve the quality of hot water even when hot water is dispensed for the first time.

Means for Solving the Problems In order to achieve the above objects, the present invention provides a main body, a container disposed in the main body for containing a liquid, a lid body covering an upper opening of the container, and a container disposed in the main body. A heating means for heating the liquid, a pump for directing the liquid in the container to the outside of the container, and a hot water tapping operation unit for driving the pump, and a part of a series of paths connecting the lower part of the container and the outlet to the outside of the container. A switching valve is provided at the top of the container to branch the paths, one of which is connected to the outlet and the other to the upper part of the container, and the temperature of the liquid in the series of paths communicating between the lower part of the container and the outlet to the outside of the container is controlled. A hot water temperature detection unit is provided to detect the hot water temperature, and when the hot water tap operation switch is operated, if the temperature of the liquid in the path is below a predetermined temperature, the liquid will be circulated to the container side by a switching valve, and if the temperature is above a predetermined temperature, the switching valve will circulate the liquid to the container side. This allows liquid to flow toward the outlet side.

With this configuration, in the present invention, while the hot water tapping operation switch is turned on, if the temperature of the liquid in the series of paths communicating between the lower part of the container and the outlet to the outside of the container is below a predetermined temperature, the liquid is circulated into the container, If the temperature is above a predetermined temperature, the liquid will be discharged from the outlet, so the hot water temperature can be kept almost the same no matter when the hot water is poured after boiling, and the quality of hot water can be improved by reducing the smell of limescale even when hot water is poured for the first time. I can do it.

EXAMPLE Hereinafter, an example of the present invention will be described based on FIG.

In FIG. 1, a cylindrical container 1 made of a thin plate of stainless steel or the like is housed in a cylindrical main body 2. 3 is a lid that covers the upper opening of the container 1; 4 is a heating means for heating the liquid in the container 1; Reference numeral 5 denotes an electric pump which is a means for drawing out the liquid in the container 1 to the outside of the container, and is driven by a motor 6. 7 is motor 6 0N
- A hot water tap operation switch for OFF control, which is linked to the hot water tap operation section 8. A discharge port of the pump 5 is connected to a switching valve 10 via a first water pipe 9. The water pipe branches from the switching valve 10 into a second water pipe 11 and a third water pipe 12.
The water pipe 11 is connected to the outlet 13 to the outside of the vessel, and the third water pipe 12
are connected to the top of container 1, respectively. 14 is the first
This is a hot water temperature detection unit that detects the temperature of hot water in the water pipe 9, and is attached to the connecting vibe 15 that connects the pump 5 and the first water pipe 9. 16 is a circuit section that controls the functions of the entire body.

The operation of the electric water heater configured as above will be explained below.

When the liquid in the container 1 is heated by the heating means 4 and the hot water is kept warm after boiling, if the hot water tap operation unit 8 is operated to tap the hot water, the temperature of the hot water in the first water pipe 9 is adjusted to the connecting pipe portion 15.
Since the water temperature is detected by the hot water temperature detection unit 14 attached to the
If the temperature of the liquid in the water tube 9 is below a predetermined temperature, the circuit section 16 controls the switching valve 10 to return the liquid in the water tube 9 to the container 1 and circulate it. Further, if the temperature of the liquid in the first water pipe 9 is above a predetermined temperature, or if it becomes above a predetermined temperature, the circuit section 16 controls the switching valve 10,
The liquid in the water pipe 9 and the container 1 is discharged from the outlet 13.

Note that even if you operate the hot water dispenser operation unit 8, if the temperature of the liquid in the first water pipe 9 is below a predetermined temperature and the liquid in the container 1 is circulating and the hot water is not being dispensed, for example, a message indicating that the hot water is being circulated is displayed. By providing an indicator lamp or by making a buzzer sound, the user can be informed that there is no malfunction.

As a result, the hot water temperature can be kept almost the same no matter when the hot water is poured after boiling, and the quality of hot water can be improved by reducing the smell of limescale even when hot water is poured for the first time.

Effects of the Invention As described above, according to the electric water heater of the present invention, a switching valve is provided in the middle of the path from the container to the outlet, and the path is branched, with one path leading to the outlet and the other connecting to the path on the upper side of the container. When hot water is tapped, if the water temperature in the water pipe is below a predetermined temperature, the hot water in the water pipe can be circulated and raised to the same level as the water temperature in the container, and when the temperature exceeds the predetermined temperature, the switching valve Since the water is switched and the hot water is dispensed, the hot water temperature can be kept almost the same no matter when the hot water is dispensed after boiling. In addition, it is possible to improve the quality of hot water by reducing the smell of limescale even when the hot water is poured for the first time.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of an electric water heater showing an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of a conventional electric water heater. Engineering: Container, 2: Main body, 3:
... Lid body, 4 ... Heating means, 5 ... Pump, 7 ... Hot water tap operation switch, 8 ...
・Hot water tap operation section, 10...Switching valve, 13...
... Outlet, 14... Hot water temperature detection section.

Claims (1)

[Claims] a main body, a container disposed within the main body for containing a liquid, a lid covering an upper opening of the container, a heating means for heating the liquid in the container, and a device for guiding the liquid in the container to the outside of the container. a pump that drives the pump; a hot water tapping operation unit that drives the pump;
A switching valve is provided in the middle of a series of paths that communicate between the lower part of the container and the outlet to the outside of the container, so that the paths are branched, and one is connected to the outlet, the other is connected to the upper part of the container, and the lower part of the container is connected to the outlet. A hot water temperature detection unit is provided to detect the temperature of the liquid in a series of paths that communicate with the outlet to the outside of the vessel, and when the hot water tap operation switch is operated, if the temperature of the liquid in the path is below a predetermined temperature, the switching valve is activated. An electric water heater that circulates liquid to the container side using a switching valve and flows the liquid to the outlet side using a switching valve if the temperature exceeds a predetermined temperature.