JPH05154050A - Electric kettle - Google Patents

Abstract

PURPOSE:To provide an electric kettle in which heating after boiling is continued according to the judgement of water quality to prevent useless power consumption and impurities like breaching powder from being insufficient by removed. CONSTITUTION:A water quality judging means 7 for judging the water quality of liquid, a boiling detecting means 8 for detecting the state of the boiled liquid and a control means 9 for controllably heating the liquid are provided to keep on heating and boiling after the liquid is boiled according to the judged water quality.

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 for keeping warm water in an ordinary household.

[0002]

2. Description of the Related Art A conventional electric water heater will be described with reference to the overall configuration diagram of FIG. As shown in the figure, inside the water heater main body 1, there is a container 2 having an upper opening, a lid is arranged at the opening of the container 2, and a heating means 4 for heating liquid at the bottom of the container 2 and the inside of the container 2. A temperature sensor 6 for measuring the temperature of the liquid is disposed, the temperature sensor 6 outputs a signal to a boiling detection means 8 for detecting a boiling state, and the boiling detection means 8 outputs a signal to the control means 9 when the boiling state is reached. The control means 9 outputs a control signal to the energization control means 10 which controls the energization of the heating means 4.

The operation of the electric water heater configured as described above will be described. When the liquid in the container 2 is heated by the heating means 4, the temperature sensor 6 detects the temperature of the liquid and outputs it to the boiling detection means 8. The boiling detection means 8 outputs a signal to the control means 9 when the boiling state is detected from the output of the temperature sensor 6. After receiving the signal from the boiling detection means 8, the control means 9 outputs a signal to the energization control means 10 for a certain period of time to continue the heating after boiling to remove volatile impurities such as chlorine.

[0004]

However, in the above-mentioned conventional structure, although the amount of impurities such as organic chlorine (so-called chlorine) contained in the liquid varies depending on the region, season or liquid amount, heating after boiling is performed. Since the extension of time is constant, for example, when the impurity concentration is low, the removal was sufficiently performed, but the heating is continued for an excessive amount of power, and when the impurity concentration is high, the removal is sufficiently performed. However, there is a problem in that the extension of heating is completed and the removal rate becomes low even though it is not.

The present invention solves the above-mentioned conventional problems, and determines the water quality in the container that differs depending on the region and season, extends heating after boiling is detected, and efficiently removes impurities such as chlorine. The purpose is to provide a water heater.

[0006]

In order to achieve the above object, the electric water heater of the present invention has a water quality judging means for judging the water quality of a liquid, and an energization control until the water quality reaches a predetermined state in the heating extension state. The control means continues to output the ON signal to the means.

[0007]

According to the present invention, with the above configuration, the water quality which differs depending on the region and season is judged and the heating after boiling is extended.
It is possible to sufficiently remove impurities without wasting electric power.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.
Will be explained. The same parts as those in the conventional example are designated by the same reference numerals and the description thereof will be omitted.

FIG. 1 is an overall configuration diagram of an electric water heater. As shown in the drawing, the water heater body 1 has a container 2, a lid 3, a heating means 4, a temperature sensor 6 and a conductivity of liquid in the container 2. The conductivity measuring means 5 for measuring the temperature is arranged, and the signal of the conductivity measuring means 5 is outputted to the water quality judging means 7 for judging the water quality of the liquid.

The water quality judging means 7 outputs a signal to the control means 9 when the conductivity of the liquid reaches a predetermined value, and the boiling detecting means 8 brings the liquid in the container 2 into a boiling state. At that time, a signal is output to the control means 9.

The control means 9 outputs a signal to the energization control means 10 which controls the energization of the heating means 4 in accordance with the input signals from the water quality judgment means 7 and the boiling detection means 8. In this embodiment, a relay is used as the energization control means 10.

The operation of the electric water heater configured as described above will be described with reference to the circuit configuration diagram of FIG. 2 and the relationship diagram of heating time and liquid temperature of FIG.

As shown in FIG. 2, when the heating means 4 is energized by the commercial power source 11, the liquid in the container 2 is heated and the temperature sensor 6 detects the temperature of the liquid.

The boiling detection means 8 compares the temperature rising gradients (Δθ / Δt) shown in FIG. 3 at any time, and when the liquid is in a boiling state, this temperature rising gradient becomes smaller, so that it falls below a predetermined rising gradient. At the time (t1), it is determined that the liquid is in a boiling state, and an ON signal is output to the control means 9.

The conductivity measuring means 5 measures the conductivity of the liquid in the container 2 and outputs it to the water quality judging means 7. The conductivity of a liquid depends on the amount of dissolved ions in the liquid, and the conductivity increases as the amount of calc (Cl) contained in the liquid increases.
The water quality judging means 7 can know the concentration of scaly or the like contained in the liquid from this conductivity. The water quality judging means 7 judges the water quality by comparing the output from the conductivity measuring means 5 with a predetermined value, and outputs a signal to the control means 9 when judging that the scaly or the like has been removed.

When the signal (boiling state) is input from the boiling detection means 8, the control means 9 confirms the signal from the water quality determination means 7. If the signal is a signal in which the scaly or the like is not sufficiently removed, an ON signal is output to the relay coil 10b of the energization control unit 10 that controls the energization of the heating unit 4 to drive the relay contact 10a to continue heating. On the other hand, if the signal is a signal from which scaly or the like has been removed, an off signal is output to the relay coil 10b, and heating of the liquid ends.

As described above, according to this embodiment, the water quality judgment means 7 and the control means 9 are provided to judge the water quality of the liquid which is different depending on the region and the season, and to determine the water quality after boiling depending on the concentration of impurities such as chlorine Since the heating is extended, power is not wastefully consumed, and the problem of insufficient removal of impurities can be prevented, and optimal water purification can be performed.

[0018]

As described above, according to the present invention, by providing the water quality judging means for judging the water quality in the liquid and the controlling means for controlling the heating time after boiling according to the water quality, it is possible to prevent calcination in the liquid. When the concentration of impurities is high, the heating time after boiling is lengthened, and when the concentration is low, the heating time is shortened to avoid wasting power and prevent the problem of insufficient removal of impurities. An excellent electric water heater can be provided.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of an electric water heater showing an embodiment of the present invention.

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

FIG. 3 is a relationship diagram showing the relationship between the heating time and the liquid temperature of the electric water heater.

FIG. 4 is an overall configuration diagram of a conventional electric water heater.

[Explanation of symbols]

 2 container 4 heating means 7 water quality judgment means 8 boiling detection means 9 control means 10 energization control means

Claims (1)

[Claims] 1. A container for containing a liquid, heating means for heating the liquid in the container, energization control means for controlling energization of the heating means, and boiling detection for detecting a boiling state of the liquid in the container. Means, a water quality judging means for judging the water quality of the liquid in the container, and the energization until the value obtained by the water quality judging means reaches a predetermined value after the boiling of the liquid is detected by the boiling detecting means. An electric water heater comprising: a control means for outputting an ON signal to the control means.