JPH09322854A - Electric water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress noise during the boiling by continuously heating of temper ature areas within a range of the temperature of hot water exceeding a specified value during the boiling by a consumed power lower than a rated value. SOLUTION: A bottomed cylindrical liquid container 2 is housed in an outer case 1 and is made up of a bottom part container 2 and a side container, and assembled by welding. Moreover, a heating body 3 using a mica heater on the bottom of the bottom part container is integrated by welding. The consumption of power is lowered to a half of a rated value when the temperature of hot water reaches 50 deg.C by the heating body 3 during the boiling. After heating is made slowly up to 90 deg.C, the consumption of power is continuously raised to the rated value to boil the water. This can shorten the time up to the boiling in a boiler thereby suppressing the noise during the boiling.

Description

Detailed Description of the Invention

[0001]

The present invention relates to an electric water heater,
In particular, the present invention relates to an electric water heater with excellent quietness.

[0002]

2. Description of the Related Art Generally, an electric water heater has a structure in which a heating element is integrated at the bottom of a liquid container, and when the water is boiled, there is a high boiling noise, and there is a problem when used at night or in a quiet room. It was Therefore, fluorine coating was applied to the inner surface of the liquid container to reduce noise, and the liquid container was put into practical use. However, even in such an improved electric water heater, dissatisfaction with quietness is still strong, and an electric water heater with further excellent quietness has been desired.

In an electric water heater, a sound is generated when boiling water. The bubbles generated on the heating surface of the liquid container are rapidly cooled by the water and the bubbles pop, and the sound generated at this time is transmitted to the liquid container through the heating surface. It is estimated that the sound is generated.

Therefore, in order to reduce the boiling noise, it is sufficient to reduce the number of bubbles generated or to suppress the rapid popping phenomenon of the bubbles. Specifically, the power consumption should be as low as possible and the boiling water should be slow. You can boil. However, such a method requires a long time for boiling water and is difficult to put into practical use.

[0005]

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide an electric water heater which is extremely excellent in noise reduction during water heating. Also,
It is an object of the present invention to provide an electric water heater that has a fast boiling time and is extremely excellent in noise reduction during boiling.

[0006]

One of the means of the present invention for solving the above-mentioned object is to consume any temperature range in which the temperature of the hot water is 50 ° C. or higher during boiling, which is lower than the rated value. This is an electric water heater that is continuously heated by electric power.

[0007] Another means is an electric water heater which intermittently heats a temperature range in which the water temperature is 50 ° C or higher at the time of boiling water with power consumption lower than the rated value.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION According to the first aspect of the present invention, when boiling water, any temperature range in which the water temperature is in the range of 50 ° C. or higher is continuously heated with power consumption lower than the rated value. It is a water heater, which makes it possible to provide an electric water heater with a quiet heating sound.

According to a second aspect of the present invention, there is provided an electric water heater which intermittently heats a temperature range in which the water temperature is 50 ° C. or more at the time of boiling water with power consumption lower than the rated value. It is possible to provide an electric water heater that has a fast boiling time and is extremely excellent in noise reduction during boiling.

According to a third aspect of the present invention, the main heater and the auxiliary heater are provided as the heating means, and any temperature range in which the hot water temperature is 50 ° C. or higher at the time of boiling water is continuously heated by only the auxiliary heater. The electric water heater having such a structure can be provided, and by effectively utilizing the auxiliary heater used during the heat retention, it is possible to provide the electric water heater with a quiet boiling water noise.

According to a fourth aspect of the present invention, the main heater and the auxiliary heater are provided as heating means, and at the time of boiling water, any temperature range in which the hot water temperature is 50 ° C. or higher is intermittently heated by only the main heater. Thus, it is possible to provide an electric water heater which has a fast boiling time and is extremely excellent in noise reduction during the water heating.

[0012]

EXAMPLE FIG. 1 is a graph showing changes in boiling noise generated from an electric water heater when the conventional electric water heater was filled with water and the heater was turned on for heating. As is clear from Fig. 1, the boiling noise is loud when the water temperature is 5
0 ° C. or higher. It is presumed that this is because the number of bubbles generated in this temperature region is large and the sudden repulsion phenomenon of the generated bubbles becomes large. And, especially in the temperature range of 70 to 80 ° C., the boiling noise becomes maximum. Therefore, if the above-mentioned temperature range is heated as slowly as possible, the boiling water noise can be reduced. As a method for this, heating may be performed continuously or intermittently with power consumption below the rated value. Any method may be used to reduce the power consumption to the rated value or less. Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

(Embodiment 1) FIG. 2 is a sectional view of an electric water heater according to the present invention. An outer case 1 has a bottomed cylindrical liquid container 2 housed in the outer case 1. This liquid container 2
Consists of a bottom container 2a and a side container 2b, which are integrated by welding. Further, a heating element 3 using a mica heater is integrated with the bottom of the bottom container 2a by welding. Reference numeral 4 denotes a lid that covers the opening of the liquid container 2 and is pivotally mounted so as to be openable and closable and has a vapor passage 5 inside. Reference numeral 6 denotes a motor. A pump 7 is interlocked with the motor 6 so that the motor 6 is driven to suck the liquid from the suction port 8 and discharge the liquid from the discharge port 9. An operation unit 10 includes a variable unit, a knob (both not shown), and the like, and controls a liquid discharge amount. Reference numeral 11 denotes a spout, and the liquid discharged from the discharge port 9 passes through the communication pipe 12 and is discharged from the spout 11 into a container such as a cup.

In the electric water heater having such a structure, when the temperature of the hot water reaches 50 ° C., the power consumption is ½ of the rated value.
And slowly heated to 90 ° C. After that, the power consumption was raised to the rated value and the mixture was boiled. The state at this time is shown in FIG. The solid line shows the change in hot water temperature, and the dotted line shows the change in power consumption.

FIG. 4 shows the change in the boiling water sound when the power consumption is changed by the hot water temperature. In the electric water heater of the present invention, the boiling water noise was 20 dB at the peak time, which was very quiet. On the other hand, when the kettle was boiled with the rated power consumption until it boiled as in the conventional case, the kettle noise was a very large value of 35 dB as shown in FIG.

Further, when the temperature of the hot water reaches 50 ° C., the main heater is turned off, and at the same time, the auxiliary heater is turned on to heat the auxiliary heater, which consumes 1/3 the power of the main heater. May be. In this case, the boiling water noise was 25 dB at the peak time.

(Embodiment 2) In an electric water heater having the same structure as that of Embodiment 1, intermittent duty control was performed as shown in FIG. 5 when the hot water temperature was between 70 ° C and 80 ° C. In addition, in FIG. 5, a solid line shows a change in hot water temperature, and a dotted line shows a change in power consumption. Further, FIG. 6 shows the change in the boiling water sound when the power consumption is changed depending on the hot water temperature. When heated by such a method, the boiling water noise was as quiet as 28 dB at the peak. In addition, the time until boiling was 9 minutes, and the time until boiling was shortened as compared with 12 minutes which is the time until boiling in Example 1 of the present invention.

[0018]

As apparent from the above description, claim 1
An electric water heater with a quiet boiling water sound is provided by continuously heating any temperature range in which the boiling water temperature is in the range of 50 ° C. or higher at the time of boiling water with the power consumption lower than the rated value. You can do it.

In addition, by intermittently heating the temperature range in which the hot water temperature is in the range of 50 ° C. or higher at the time of boiling water according to the invention of claim 2 with power consumption lower than the rated value,
It is possible to provide an electric water heater that has a fast boiling time and that is extremely excellent in noise reduction during boiling.

Further, according to the third aspect of the present invention, it is possible to provide an electric water heater having a quiet boiling water noise by effectively utilizing the auxiliary heater used during heat retention.

Further, according to the invention described in claim 4, it is possible to provide an electric water heater which has a fast boiling time and which is extremely excellent in noise reduction during the boiling.

[Brief description of drawings]

FIG. 1 is a graph showing changes in boiling noise generated from a conventional electric water heater.

FIG. 2 is a sectional view of the electric water heater of the present invention.

FIG. 3 is a diagram showing a relationship between hot water temperature and power consumption in Embodiment 1 of the electric water heater.

FIG. 4 is a diagram showing a change in a boiling water sound in the first embodiment of the electric water heater.

FIG. 5 is a diagram showing a relationship between hot water temperature and power consumption in Embodiment 2 of the electric water heater.

FIG. 6 is a diagram showing changes in the boiling water sound of the electric water heater according to a second embodiment.

[Explanation of symbols]

 2 liquid containers

Claims (4)

[Claims] 1. An electric water heater capable of continuously heating any of the temperature ranges in which the water temperature is in the range of 50 ° C. or higher during boiling, with power consumption lower than the rated value. 2. An electric water heater adapted to intermittently heat a temperature range in which the water temperature is in the range of 50 ° C. or higher at the time of boiling water with a power consumption lower than the rated value. 3. An electric device having a main heater and an auxiliary heater as heating means, wherein any temperature range in which the hot water temperature is 50 ° C. or higher during boiling is continuously heated by only the auxiliary heater. Water heater. 4. An electric device having a main heater and an auxiliary heater as heating means, wherein any temperature range in which the hot water temperature is 50 ° C. or higher at the time of boiling water is intermittently heated by only the main heater. Water heater.