JPH04317610A - Electric hot-water heater - Google Patents

Abstract

PURPOSE:To sufficiently and economically eliminate an unnecessary substance such as bleaching powder, etc., in the water by detecting the additional water quantity fed to the inside of a vessel at the time of opening and closing the cover, and determining automatically a boiling state maintaining time in accordance therewith. CONSTITUTION:In the lower part of a vessel 2, a pressure sensor 5 is installed, a capacity detecting means 13 for detecting the additional water quantity in the vessel by a signal difference of the pressure sensor 5 at the time of opening and closing the cover is provided, and by its output, a boiling state maintaining time is determined by a time determining means 20.

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 water, a boiling completion notification is issued after the boiling has been maintained for a certain period of time, and during the boiling time, limescale components and the like are removed from the water.

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 will boil more than necessary. Furthermore, even when water is added midway, the above-mentioned operation is performed, resulting in a problem of power loss.

The present invention solves the above-mentioned conventional problems, and in particular, provides an economical electric water heater that automatically determines the boiling maintenance time according to the amount of added water, always sufficiently removes scale components, and which is economical. The purpose is to provide

[0006]

[Means for Solving the Problems] In order to achieve this object, the electric water heater of the present invention includes a boiling detection means for detecting that water has reached a boiling state, and a capacity detection means for detecting the amount of water in the container. The amount of additional water is determined from the means, the lid opening/closing detection means for detecting the opening and closing of the lid at the top of the container, and the output of each capacity sensing means measured when the container lid is opened and then closed, and the amount of additional water at that time is determined. The apparatus is equipped with a time determining means for determining the boiling state maintenance time according to the boiling state.

[0007]

[Operation] With this configuration, when the amount of additional water is large, the boiling state is maintained for a long time, and when it is small, it is shortened, thereby automatically determining the boiling time to remove the minimum necessary amount of unnecessary substances such as limescale 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 the main container 1, and a lid 3 that covers the top of the container 2, and detects when the lid 3 is opened when pouring water or when it is closed after pouring water. Lid opening/closing detection means 18 are respectively arranged. Also, a heating source 4 that heats the water inside the container 2
A temperature sensor 5 for detecting the water temperature inside the container 2 and a pressure sensor 17 for detecting the amount of water are arranged below.

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 operation knob 11 is operated, the switch 12
The contacts are switched, and the motor 10 is operated by the signal.

The signal from the temperature sensor 5 is input to a boiling detection means 14 which detects when the water reaches boiling point, and is input to a pressure sensor 14.
17 and the signals from the lid opening/closing detection means 18 are input to the capacity detection means 13 which detects the amount of water in the container 2.

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 above will be explained with reference to FIGS. 2 and 3.

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

The boiling detection means 14 compares the temperature increase gradient (Δθ/Δt) per unit time in a predetermined temperature range from time to time, and determines a boiling state when the temperature decreases below a certain amount of change (t1). .

The time determining means 15 determines the boiling maintenance time (t2-t1) in accordance with the amount of water (W) detected by the capacity detecting means 13, as the amount of water increases.

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

The pressure sensor 17 detects the atmospheric pressure inside the container 2 (
P0) and the total value of the water pressure in the container 2 are read and the value is transferred to the capacity detection means 13. When the capacitance detection means 13 detects that the lid 3 is opened by the lid opening/closing detection means 18 as shown in FIG. 3, it reads the output value (P0+P1) of the pressure sensor 17 at that time and stores the value. Next, after water is injected, when it is detected that the lid 3 is closed, the output value of the pressure sensor 17 at that time (P0+
P2) is read and compared with the previous value. At that time, (P
0+P1)-(P0+P2)=(P1-P2)<0
If so, it is determined that new water has been injected, and (P1-P2
) is multiplied by a predetermined coefficient determined by the specific gravity of the water and the shape of the container 2 to determine the amount of water (W) to be added into the container 2.

[0019] As an alternative to the pressure sensor,
It is also easy to think of a method of detecting the water level by measuring the reflection time to the water surface using an ultrasonic sensor, or a method of detecting the change in capacitance of a vertically installed water pipe.

As described above, according to this embodiment, there is a capacity detection means for detecting the amount of additional water in the container, a boiling detection means for detecting that the water has reached a boiling state, and a capacity detection means for detecting the amount of additional water in the container. By providing a time-determining means to determine the boiling state maintenance time, the boiling state maintenance time is lengthened when the amount of additional water is large, and is shortened when it is small, thereby removing unnecessary substances such as the minimum necessary scale components. The possible boiling time can be determined automatically.

[0021]

[Effects of the Invention] As described above, the present invention detects the volume of liquid added to the container when the lid is opened or closed, and automatically determines the time to maintain the boiling state according to the volume of added liquid at that time. This makes it possible to sufficiently remove chlorine components, mold odors, etc. from water, and to realize an excellent electric water heater that is economical and 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]
Flowchart diagram in one embodiment of the present invention

[Explanation of symbols]

2 Container 4 Heating source 18 Lid opening/closing detection means

Claims (1)

[Claims] 1. A container for storing 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 sensor for detecting the volume of the liquid in the container. means, a lid opening/closing detection means for detecting opening/closing of a container lid provided at the upper part of the container, a boiling detection means for detecting when the liquid in the container is boiling, and an output of the capacity sensing means when the container lid is opened. and the subsequent output of the capacity detection means after closing the container lid, and determine the amount of additional water, and determine the boiling maintenance time for maintaining the boiling state after the boiling of the liquid is detected by the boiling detection means according to the amount of additional water. An electric water heater equipped with time-determining means for determining the time.