JPH04312412A - Electric water boiler - Google Patents

Abstract

PURPOSE:To provide an electric water boiler which automatically determines the boiling time in response to the water quantity in a container and can remove the unnecessary material such as bleaching powder or fungus odor sufficiently and economically. CONSTITUTION:A temperature sensor 5 is installed at the lower section of a container 2, a volume detecting means 13 detecting the water quantity in the container 2 according to the signal of the temperature sensor 5 and a boiling detecting means 14 detecting the boiling arrival time of water are provided, the boiling maintaining time is judged by the output of the volume detecting means 13, the boiling time timing is set by a boiling detecting means 14, thus the optimum boiling time can be automatically determined.

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 heating and keeping water contained in a container warm.

0002

[Prior Art] In recent years, electric water heaters have not only been demanded as household items that can easily heat and keep water warm, but also in urban areas, there has been a demand for ones that also have the ability to turn water into delicious water. ing.

[0003] As a function of converting water into delicious water,
After detecting the boiling of the water, it continues boiling for a certain period of time, then notifies the completion of boiling water, and then reduces the heating amount to the amount required for keeping the water warm to maintain a predetermined heat keeping state. During the boiling time, limescale components, musty odor, etc. in the water are removed.

0004

[Problems to be Solved by the Invention] However, in the above conventional configuration, the boiling maintenance time after boiling is set to a constant time regardless of the amount of water in the container, and when the amount of water is large, the chlorine components in the water The removal rate is low, and when the amount of water is small, it boils more than necessary, resulting in a loss of power.

The present invention solves the above conventional problems, and provides an economical electric water heater that automatically determines the boiling maintenance time depending on the amount of water, always sufficiently removes scale components, and provides an economical electric water heater. The purpose is to

[0006]

[Means for Solving the Problems] In order to achieve this object, the electric water heater of the present invention includes a capacity detection means for detecting the amount of water in the container, and a boiling detection means for detecting when the water has reached a boiling state. and a time determining means for determining the boiling state maintenance time depending on the amount of water.

[0007]

[Function] With this configuration, when the amount of water is large, the boiling state is maintained for a longer time, and when it is less, it is kept shorter, thereby automatically determining the boiling time that can remove the minimum necessary amount of unnecessary substances such as chlorine components. be able to.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, there is a container 2 with an open top inside a main container 1, and a lid 3 covering the top of the container 2 is disposed. Also, a heating source 4 that heats the water inside the container 2 and a temperature sensor 5 that detects the water temperature inside the container 2.
and are placed at the bottom.

An electric pump 7 is connected to a discharge port 6 at the bottom of the container 2.
The water is discharged to the outside through a water conduit pipe 8 and an outlet 9. The motor 10 drives the electric pump 7. When the operating knob 11 is operated, the contacts of the switch 12 are switched, and the motor 10 is operated by the signal.

The signal from the temperature sensor 5 is input to a capacity detection means 13 for detecting the amount of water in the container 2 and a boiling detection means 14 for detecting when the water reaches boiling point.

The output of the capacitance detection means 13 is input to the time determination means 15, and the time determination means 15 outputs a result according to the input signal to the control means 16. The boiling detection means 14 inputs the boiling point of water to the control means 16. The control means 16 determines the amount of electricity to be applied to the heating source 4 according to each input signal.

The operation of the electric water heater constructed as described above will be explained using FIG. 2.

FIG. 2 shows the temperature change detected by the temperature sensor 5 attached in pressure contact with the container 2 over time after the heating source 4 is energized.

The capacity detection means 13 determines the amount of water (W) in the container 2 based on the temperature increase gradient (Δθ/Δt) per unit time in a predetermined temperature range. In other words, the temperature increase gradient is proportional to the amount of water.

The boiling detection means 14 compares the temperature increase gradient (Δθ/Δt) at any time, and determines that the temperature is boiling when the temperature decreases below a certain amount (t1).

The time determining means 15 determines the boiling maintenance time (t2) determined by the characteristic graph shown in FIG. 3 based on the amount of water (W) detected by the capacity detecting means 13.

The control means 16 heats with maximum power from the start of heating (t0) until time (t1+t2), and maintains the boiling state for t2 hours.

As described above, according to this embodiment, the capacity detection means detects the amount of water in the container, the boiling detection means detects that the water has reached the boiling state, and the boiling state is detected depending on the amount of water. By providing a time-determining means for determining the maintenance time of boiling water, the boiling state can be maintained for a longer time when the amount of water is large, and shorter when it is less. The time can be determined automatically.

[0019]

[Effects of the Invention] As described above, the present invention detects the volume of liquid in a container and automatically determines the time to maintain the boiling state according to the volume. Therefore, it is possible to realize an excellent electric water heater which is able to sufficiently remove water, is economical, and is easy to use.

[Brief explanation of the drawing]

[Fig. 1] Overall configuration diagram in one embodiment of the present invention

[Figure 2]
Explanatory diagram of water temperature fluctuation operation in one embodiment of the present invention

[Figure 3]
Relationship diagram between water amount and required boiling time in one embodiment of the present invention

[Explanation of symbols]

2 Container 4 Heating source

Claims (1)

[Claims] 1. A container for containing a liquid, a heating source for heating the liquid in the container, a control means for controlling the amount of electricity supplied to the heating source, and a capacity detection means for detecting the volume of the liquid in the container. and a boiling detection means for detecting the boiling state of the liquid in the container, and a boiling state after the boiling of the liquid is detected by the boiling detection means according to the liquid volume detected by the liquid capacity detection means. An electric water heater equipped with a time determining means for determining the boiling maintenance time to maintain the boiling temperature.