JPH0564049B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electric water heater for heating and keeping a contained liquid warm.

[Conventional technology]

Conventional electric water heaters with electric hot water supply function use an air pump to pump air into the liquid container.
A method is used in which the liquid inside the container is drawn out of the container using the pressure.

As shown in FIG. 5, the electrical connection of such a conventional electric water heater generally includes a heating device section consisting of two heating elements 101 and 102 and controllers 103 and 104 for each of them; Motor 105 for driving the air pump in parallel
is connected to the motor 105, and operation is started by closing the drive switch 106 of the motor 105, so that air can be pumped and the liquid in the liquid container can be drawn out. The above motor 105
The operation can be started and stopped regardless of the state of the heating device section.

[Problem that the invention seeks to solve]

However, in such conventional electric water heaters, the liquid in the container can always be drawn out by independently closing the motor drive switch, regardless of its heating state. For this reason, for example, when boiling water, the water in the container is in a very active state when it is in a boiling state, and at this point, if you close the switch and drive the motor to draw the hot water out of the container, Hot water may splash out of the water heater outlet, or it may gush out with such force that it hits the wall of the receiver, such as a cup, and the hot water splashes back, causing burns to the user and those around them. It was dangerous and there was a risk of it happening.

Also, since the fluid inside the container can always be drawn out,
Even when the liquid in the container has not reached the desired temperature, that is, when the temperature is low, malfunctions such as erroneously dispensing hot water may occur.

Therefore, the purpose of the present invention is to eliminate the above-mentioned dangers, prevent malfunctions when the desired temperature is not reached, and enable the liquid in the container to be drawn out while reaching and maintaining a constant temperature. Our goal is to provide you with an electric water heater.

[Means for solving problems]

The present invention includes a container that stores a liquid, a main heating element that heats the liquid in the container to a constant high temperature, an auxiliary heating element that keeps the heated liquid warm, and a system that guides the liquid in the container to the outside of the container. In an electric water heater, the auxiliary heating element is connected in parallel to a temperature controller that controls opening and closing of the heating element, and the auxiliary heating element is connected in series with a motor that drives the pump. By connecting a manual opening/closing switch in parallel to a temperature regulator that controls opening/closing of the main heating element, the pump cannot be operated until the liquid is heated to the high constant temperature. , the liquid reaches a high constant temperature,
This is an electric water heater that allows the above-mentioned pump to operate when the water heater is in a warm state.

[Effect]

According to the water heater of the present invention, the temperature regulator that controls opening and closing of the main heating element is closed while the main heating element is energized, that is, while the water heater is heating the liquid. Even if the pump motor connected in parallel to this temperature controller is turned on, electric pumps cannot be operated, so the hot water in the container boils and becomes active due to the electrical heating. When the boiling water is in the boiling state, hot water cannot be drawn out of the vessel, so boiling water will not be drawn out of the vessel and splash, causing burns. Furthermore, it is possible to prevent malfunctions in which the temperature of the liquid in the container does not reach a certain high temperature during boiling and the water is discharged in a cold or low-temperature state.

〔Example〕

Hereinafter, a first embodiment of the electric water heater of the present invention will be described.
This will be explained with reference to FIGS.

In FIGS. 3 and 4, reference numeral 1 denotes a main body of an electric water heater, and a container 2 containing liquid is housed in the main body 1. The upper end of the main body 1 is open, and a spout 3 is fixed thereto, and a hook 4 is integrally attached to the lower end. 5 is spout 3
This lid 5 can be opened and closed with respect to the spout 3 by pressing a lock knob 6 provided at the front of the lid 5. A steam port 7 is provided near the upper rear edge of the lid 5, which communicates with the inside of the container 2.
When the steamer generated inside becomes overpressurized, it is dissipated from there.

A guide hole 8 is provided at the lower side of the container 2, and this guide hole 8 communicates with an inlet port 11 of an electric pump 10 through a waterproof packing 9 made of silicone rubber or the like, which is approximately L-shaped. ing. Above pump 1
0 is driven by a motor 12, which functions to suck in and send out the liquid in the container 2, and the liquid is pumped by the pump 1.
Water pipe bushing 1 with a built-in outflow prevention valve 15 exits from the outlet 13 of 0 and passes through the outlet pipe 14.
6 and is discharged from the discharge port 17 to the outside of the vessel.

On the back side of the bottom of the liquid container 2, a main heating element 18 and an auxiliary heating element 19, each of which has an insulating plate (not shown) laminated thereon, are made of a metal with good thermal conductivity such as aluminum or copper. It is fixed by a heat diffusion plate 20 and a back plate 21 in a compressed state.

22 is a first temperature regulator that controls opening and closing of the main heating element 18, 23 is a second temperature regulator that controls opening and closing of the auxiliary heating element 19, and 24 is a switch for opening and closing the motor 12. .

The electric circuit of the water heater constructed as described above is shown in FIGS. 1 and 2. When water is put into the container 2 and heating is started and continued, the first temperature regulator 22 for the main heating element 18 is closed, as shown in FIG. Current flows through the container, but no current flows through the motor 12. Even if the motor switch 24 is closed, the motor 12 is not driven, and therefore the water in the container is not drawn out.

On the other hand, when the water in the container reaches a certain high temperature (e.g. boiling start temperature), the first temperature controller 2
2 is open and current flows through the auxiliary heating element 19 and the motor 12 as shown in FIG. The opening and closing of the auxiliary heating element 19 is performed by a second temperature regulator 20, which controls the temperature of the water in the container, that is, keeps it warm. At this time, the voltage applied to both ends of the motor 12 changes slightly depending on the opening/closing state of the second temperature regulator, but this does not affect operation, and the motor switch 24 can be operated at any time during the heat retention state. By doing so, the high temperature water (hot water) in the container 2 can be drawn out. In addition, in Figures 1 to 3, 25
The lamp 26 indicates that the water is being boiled, that is, the water is being heated by the main heating element 18, and the lamp 26 indicates the heat retention state. Therefore, while the lamp 25 is on, liquid cannot be drawn out. , while the lamp 26 is on, the liquid can be drawn out.

〔Effect of the invention〕

As is clear from the above examples, in the electric water heater according to the present invention, the electric pump cannot be operated while boiling water, so the hot water in the container is still heated by the main heating element and is actively boiling. In this state, the hot water cannot be drawn out of the vessel, and therefore, the hot water will not be drawn out and splashed while the water is boiling, causing burns. Furthermore, since water that has not yet reached a sufficiently high temperature cannot be discharged while boiling continues, it is possible to prevent malfunctions in which cold water or low-temperature hot water is discharged. Therefore, a water heater with excellent safety and operability can be provided.

[Brief explanation of the drawing]

Fig. 1 is an electric circuit diagram of an embodiment of the present invention in a heat-retaining state, Fig. 2 is an electrical circuit diagram of a water heater in a boiling state, Fig. 3 is a perspective view of an embodiment of the water heater of the present invention, and Fig. 4 The figure is a sectional view thereof, and FIG. 5 is an electric circuit diagram of a conventional electric water heater. 2...Liquid container, 18...Main heating element, 19...
Auxiliary heating element, 10...pump, 12...motor, 24...motor switch.

Claims (1)

[Claims] 1 A container that contains a liquid, a main heating element that heats the liquid in the container to a constant high temperature, an auxiliary heating element that keeps the heated liquid warm, and a device that leads the liquid in the container out of the container. In an electric water heater equipped with an electric pump, the auxiliary heating element is connected in parallel to a temperature controller that controls opening and closing of the main heating element, and the auxiliary heating element is connected in series with a motor that drives the pump. By connecting a manual open/close switch in parallel to a temperature controller that controls opening and closing of the main heating element, the pump cannot be operated until the liquid is heated to the high constant temperature. . An electric water heater, characterized in that the pump is enabled to operate when the liquid reaches a constant high temperature and enters a warm state.