JPH08112202A - Electric water heater - Google Patents

Abstract

PURPOSE: To provide an electric water heater for heating a liquid and keeping it warm, which device increases the temperature of the liquid in a container optionally in the insulation mode maintains the liquid temperature at a level higher than the heat-insulation temperature. CONSTITUTION: An electric water heater comprises boil detecting means 8 attached to a recess 7 formed in the bottom of a container 2. The boil detecting means 8 controls the energization of a heat generator unit 4 in accordance with temperature changes of the liquid in the container 2. A switch 9 is connected in parallel to the boil detecting means 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric water heater which heats a liquid in a container by a heater to bring it to a boil and blinks the heater according to a change in the temperature of the liquid to keep the liquid at a predetermined temperature. It is about.

[0002]

2. Description of the Related Art In a conventional electric water heater, FIG.
In FIG. 7, reference numeral 21 is a main body, 22 is a container having an upper surface opening for accommodating the liquid, which is placed in the main body 21, a lid for covering the opening of the container, and 24 is a heating unit for heating the liquid in the container. It is composed of a main heater 25 and an auxiliary heater 26. The main heater 25 is a self-recovery type boiling detection means 2 attached to a recess 27 formed in the bottom surface of the container 22.
The energization is controlled by 8. Further, the energization of the auxiliary heater 26 is controlled by a self-reset type temperature detecting means 29 attached to the bottom surface of the container 22.

In the above structure, the water charged in the container 22 is heated by the heat generating unit 24 and is convected. At this time, the water contained in the recess 27 formed on the bottom surface of the container 22 is hardly affected by convection, but the container 2
When the water in 2 boils and the convection becomes violent, it is agitated and the recess 2
The temperature of the boiling detection means 28 attached to 7 is raised and the main heater 25 is turned off. The water in the container 22 is supplied to the auxiliary heater 2 by the temperature detecting means 29 attached to the bottom surface of the container 22.
The power of 6 is controlled and kept warm.

After the heating unit 24 has boiled and switched to heat retention, the re-operation temperature (T1) of the self-recovery type boiling detection means 28 and the re-operation temperature of the self-recovery type temperature detection means 29. Since (T2) is set to T1 <T2, the main heater 25 is not energized, so that the water in the container 22 can be kept at a constant temperature by controlling the energization of the auxiliary heater 26.

[0005]

In the electric water heater having such a conventional structure as described above, the water in the container 22 cannot be heated to a temperature higher than the preset heat retaining temperature during the heat retention, and the water in the container 22 cannot be kept warm. The water could not be boiled unless the water was used up and new water was added.

The present invention is intended to solve the above problems, and it is an object of the present invention to arbitrarily raise the water in the container 22 during heat retention to a temperature higher than the heat retention temperature.

[0007]

In order to achieve this object, the first means controls the energization of the heater, which is mounted in a recess formed in the bottom surface of the container according to the temperature change of the liquid. It has a temperature detecting means and a switch connected in parallel with the temperature detecting means.

The second means is a temperature detecting means mounted in a recess formed on the bottom surface of the container for controlling the energization of the heater according to the temperature change of the liquid, and the temperature detecting means is connected in parallel to the temperature detecting means. The temperature detecting means for arbitrarily starting the energization by the above operation to detect the rise in the temperature of the liquid and shutting off the energization to the heater is installed in the recess formed in the bottom of the container.

The third means is a temperature detecting means for controlling the energization of the heater at the bottom of the container for containing the liquid in accordance with the temperature change of the liquid, and an energization by an external operation to optionally start the energization of the liquid. Is provided with a temperature detecting means for cutting off the energization of the heater by detecting the rise of the temperature.

[0010]

With the above-described structure, the present invention makes it possible to obtain high-temperature hot water by easily raising the temperature of the water in the container to a temperature higher than the preset heat retention temperature during heat retention.

According to the second means, since the energization is stopped by sensing the temperature of the water in the container, it is easy to reboil the water in the container while keeping the temperature.

According to the third means, the recess at the bottom of the container for mounting the temperature detecting means for cutting off the power supply to the heater can be obtained by easy processing.

[0013]

【Example】

(First Embodiment) A first embodiment of the present invention will be described with reference to the accompanying drawings. 1 and 2, 1 is a main body, 2
Is a container 3 having a top opening for containing the liquid placed in the main body 1.
Is a lid that covers the opening of the container, and 4 is a heating element unit that heats the liquid in the container. Main heater 5 and auxiliary heater 6
It is composed of Energization of the main heater 5 is controlled by a self-recovery type boiling detection means 8 attached to a recess 7 formed on the bottom surface of the container 2. A switch 9 is connected in parallel with the boiling detection means 8. Further, the energization of the auxiliary heater 6 is controlled by the self-reset type temperature detecting means 10 attached to the bottom surface of the container 2.

The operation of the electric water heater constructed as above will be described. The water put in the container 2 is
The heating element unit 4 heats and convects. At this time,
The water contained in the recess 7 formed on the bottom surface of the container 2 is hardly affected by convection, but when the water in the container 2 boils and is agitated when the convection becomes intense, the water attached to the recess 7 is boiled. The temperature of the detection means 8 is raised and the main heater 5 is de-energized. The water in the container 2 is kept warm by controlling the energization of the auxiliary heater 6 by the temperature detecting means 10 attached to the bottom surface of the container 2. During the heat retention, the water in the container 2 has a temperature detecting means 1
It is kept at the set temperature of 0, but switch 9 is turned on.
When the main heater 5 is energized and the main heater 5 is energized, the water in the container 2 which is kept warm can be raised.

(Second Embodiment) A second embodiment of the present invention will be described with reference to the accompanying drawings. 3 and 4,
Reference numeral 1 is a main body, 2 is a container having an upper opening for containing a liquid placed in the main body 1, 3 is a lid for covering the opening of the container, 4 is a heating element unit for heating the liquid in the container, and a main heater 5 and It is composed of an auxiliary heater 6. Energization of the main heater 5 is controlled by a self-recovery type boiling detection means 8 attached to a recess 7 formed on the bottom surface of the container 2. Further, the energization of the auxiliary heater 6 is controlled by the self-reset type temperature detecting means 10 attached to the bottom surface of the container 2. 1 is different from FIG. 1 in that the boiling detection means 8 is connected in parallel to the recess 11 other than the recess 7 in which the boiling detection means 8 of the container 2 is attached, and further, an electric current is arbitrarily started by an external operation to change the temperature of the liquid. This is to dispose a boiling point detecting means 12 of a manual resetting type that senses the rise and shuts off the power supply to the heater. 1
Reference numeral 3 denotes an operation mechanism for operating the manual return type boiling detection means 12.

The operation of the electric water heater constructed as above will be described. The water charged into the container 2 is heated by the heating element unit 4 and convection occurs. At this time, the water contained in the recesses 7 and 11 formed in the bottom surface of the container 2 is hardly affected by convection, but is agitated when the water in the container 2 boils and the convection becomes intense, Boiling detecting means 8 and boiling detecting means 12 attached to the concave portion 7 and the concave portion 11, respectively.
Then, the main heater 5 is turned off. The water in the container 2 is kept warm by controlling the energization of the auxiliary heater 6 by the temperature detecting means 10 attached to the bottom surface of the container 2. While the water is kept warm, the water in the container 2 is kept at the temperature set by the temperature detecting means 10, but the operation mechanism 13 is operated to force the water.
Manual return type boiling detection means 12 is operated to operate the main heater 5
When electricity is applied to the water, the water in the container 2 is heated and begins to convect.
When the water in the container 2 is boiled and the convection becomes violent, it is stirred and the temperature of the boiling detection means 12 attached to the recess 11 is raised, and the main heater 5 is de-energized. Can be boiled.

Further, as shown in FIG. 5, the boiling detecting means 8,
Even if the boiling detection means 12 is provided in one recess 14, the same operation as described above can be obtained. This can facilitate the processing of the container.

[0018]

As described above, according to the present invention, the temperature detecting means for controlling the energization of the heater according to the temperature change of the liquid mounted in the recess formed on the bottom surface of the container, and the temperature detecting means are provided. By having the switches connected in parallel, it is possible to easily raise the temperature of the water in the container to a temperature higher than the preset heat retention temperature during heat retention and obtain hot water.

Further, the temperature detecting means for controlling the energization to the heater according to the temperature change of the liquid, which is attached to the concave portion formed on the bottom surface of the container of the second means, and the concave portion to which the temperature detecting means is attached. Insulation other than the above is connected in parallel with the temperature detecting means, and further has temperature detecting means for arbitrarily starting energization by an external operation to detect an increase in the temperature of the liquid and shutting off energization to the heater The water inside the container can be easily reboiled.

Further, the temperature detecting means for controlling the energization of the heater according to the temperature change of the liquid at the bottom of the container for containing the liquid of the third means, and the energization of the liquid by arbitrarily starting the energization by an external operation. By providing the recess for arranging the temperature detecting means for detecting the rise in temperature and shutting off the energization of the heater, the recess at the bottom of the container can be easily obtained.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view of an embodiment of the electric water heater of the first means.

FIG. 2 is a circuit diagram of the electric water heater of the first means.

FIG. 3 is a schematic vertical sectional view of an embodiment of the electric water heater of the second means.

FIG. 4 is a circuit diagram of the electric water heater of the second means.

FIG. 5 is a schematic vertical sectional view of an embodiment of the electric water heater of the third means.

FIG. 6 is a schematic vertical sectional view of an example of a conventional electric water heater.

FIG. 7 is a circuit diagram of a conventional electric water heater.

[Explanation of symbols]

 2 container 4 heating element unit 7 recessed portion 8 boiling detection means 9 switch 11 recessed portion 12 boiling detection means 13 operation mechanism 14 recessed portion

Claims (3)

[Claims] 1. A container for containing a liquid, a heater for heating the liquid in the container, and an energization of the heater controlled according to a temperature change of the liquid mounted in a recess formed in the bottom surface of the container. An electric water heater comprising: a temperature detecting means for controlling the temperature and a switch connected in parallel with the temperature detecting means. 2. A container for containing a liquid, a heater for heating the liquid in the container, and a control of energization to the heater according to a temperature change of the liquid mounted in a recess formed in the bottom surface of the container. Temperature detecting means connected in parallel with the temperature detecting means, and further, the temperature detecting means for starting the electrification by an external operation to sense an increase in the temperature of the liquid and shutting off the electricity to the heater. An electric water heater characterized by being installed in a recess formed in the bottom. 3. The electric water heater according to claim 2, wherein a recess is provided at the bottom of the container for containing the liquid.