JP2995879B2 - Electric water heater - Google Patents

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 boiling water contained in a container and keeping it warm.

[0002]

2. Description of the Related Art In recent years, there has been a demand for an electric water heater for keeping water warmed by boiling water contained in a container so that the kept hot water has no chlorine odor.

Conventionally, this type of electric water heater generally has a configuration as shown in FIG. Hereinafter, the configuration will be described.

[0004] As shown in the figure, a bottomed cylindrical container 1 contains water, and the water contained in the container 1 is heated by a heating means 2. The temperature detecting means 3 detects the temperature of the water contained in the container 1, and the temperature comparing means 4 detects the temperature of the water.
The output of the above is input and the temperature of the water contained in the container 1 is compared with a predetermined temperature for heating. The boiling detecting means 5 receives the output of the temperature detecting means 3 as input and detects the boiling of the water contained in the container 1, and the timing means 6 determines a predetermined time from when the boiling detecting means 5 detects the boiling to when the heating is completed. The heating time extension instructing means 7 gives an instruction to continue heating for a predetermined time after the boiling detecting means 5 detects the boiling of the water contained in the container 1. The heating control means 8 receives the outputs of the temperature comparing means 4, the boiling detecting means 5, the time measuring means 6 and the output of the heating time extension instructing means 7 as inputs, and controls the heating means 2 and resets the time measurement by the time measuring means 6. When the user operates the heating time extension instructing means 7 to remove the chlorine odor of the water contained in the container 1 and instructs to extend the heating time after detecting the boiling, the boiling detecting means 5
Thus, when the boiling of the water contained in the container 1 is detected, the heating time is extended by a predetermined time measured by the timer 6.

[0005]

In such a conventional electric water heater, if the user forgets to operate the heating time extension instructing means 7 when water is added during the heat retention, the boiling detecting means 5 detects the boiling. Then, since the heating is immediately terminated, the effect of removing chlorine odor becomes worse. for that reason,
In order to surely obtain the effect of removing chlorine odor, each time a user adds water to the container 1, the heating time extension instructing means 7
Has to be performed.

[0006] The present invention solves the above-mentioned problems, and detects boiling by judging that new water has been added without paying special attention when the user adds water to the container. The purpose is to extend the heating time by a predetermined time later, and to obtain a reliable effect for removing chlorine odor.

[0007]

In order to achieve the above object, the present invention provides a heating means for heating water contained in a container, and a temperature detector for detecting the temperature of the water contained in the container. Means, a temperature comparison means for comparing the temperature of the water in the container with a predetermined temperature using the output of the temperature detection means as an input, and water stored in the container with the output of the temperature detection means as an input. Boiling detection means for detecting boiling;
A temperature change calculating means for obtaining a change in the temperature of the water contained in the container based on the output of the temperature detecting means, and a heating time for a predetermined time after detecting the output and the boiling of the temperature change calculating means. Temperature change amount comparing means for comparing with a predetermined temperature change amount instructing to extend, time measuring means for measuring a predetermined heating time after detecting boiling, the temperature comparing means, the boiling detecting means, and the temperature Heating control means for controlling the heating means with the output of the change amount comparing means and the output of the time measuring means as inputs, wherein the temperature control means causes the water to boil when the temperature of the water in the container changes more than a predetermined temperature change amount. The object of the present invention is to control the heating means so that the heating is extended for a predetermined time after the detection of the heating and then the heating is terminated.

[0008]

According to the present invention, it is possible to judge that water has been added based on a change in the temperature of water when the water is added while keeping the temperature in the container, and to determine the water for a predetermined time after detecting boiling. By heating, it is possible to perform heating so as to effectively remove chlorine odor without requiring the user to pay special attention to extend the heating time.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the means for solving the problems will be described below with reference to FIG. The same components as those in the conventional example are denoted by the same reference numerals, and description thereof is omitted.

As shown in the figure, a temperature change amount calculating means 9 receives an output of the temperature detecting means 3 as input, obtains a change amount ΔK of water temperature in the container 1 at each time, and obtains a temperature change amount comparing means 1.
Output to 0. The temperature change amount comparing means 10 compares the temperature change amount ΔK obtained by the temperature change amount calculating means 9 with a predetermined temperature change amount Δθ instructing to extend the heating time, and detects the boiling, and then performs the heating. Indicate whether to extend the time. The heating control means 11 includes a temperature comparing means 4, a boiling detecting means 5, a time measuring means 6, and a temperature change amount comparing means 1.
When the output of 0 is input, the time t is reset when the control of the heating means 2 and the timekeeping means 6 time the predetermined time T.

In the above configuration, the operation will be described according to the procedure of the flowchart shown in FIG. 2. First, at step 101, the temperature K of the water in the container 1 is detected by the temperature detecting means 3. In step 102, the temperature change amount ΔK of the water in the container 1 is obtained from the temperature K obtained in step 101 by the temperature change amount calculating means 9, and step 103
Proceed to. In step 103, ΔK and a predetermined temperature change amount Δ
is compared with .theta., and if .DELTA.K <.DELTA..theta.
Then, if ΔK ≧ Δθ, the routine proceeds to step 107.
In step 104, the predetermined temperature θ0 compared by the temperature comparing means 4 is compared with the temperature K obtained in step 101. If K <θ0, the process proceeds to step 105, where heating is performed and the process returns to step 101. , K ≧ θ0, the process proceeds to step 106, the heating is stopped, and the process returns to step 101. When ΔK ≧ Δθ in step 103 and the process proceeds to step 107, it is confirmed whether or not heating is currently being performed.
If the heating is not being performed, the process proceeds to step 108, the heating is started, and then the process proceeds to step 109. If the heating is already being performed, the process directly proceeds to step 109. In step 109, the temperature detecting means 3 detects the temperature K of the water in the container 1 and
Proceeding to step 10, in step 110, the boiling detecting means 5 detects whether or not the water in the container 1 has boiled by using the output of the temperature detecting means 3 as an input.
Returning to step 09, if boiling is detected, the routine proceeds to step 111.
In step 111, the time t measured by the timekeeping means 6
Is reset to start timing, and the routine proceeds to step 112.
In step 112, the time t after the boiling is detected by the time measuring means 6 is measured. In step 113, the predetermined heating time T after the detection of the boiling is compared with the time t measured in step 112. If t <T, the process returns to step 112, and if t ≧ T, the process proceeds to step 114, and the heating by the heating means 2 is terminated by the output of the heating control means 11.

As a result, when the amount of change in the temperature of the water in the container 1 becomes larger than a predetermined amount of change in temperature, the amount of change in temperature can be detected and an instruction can be given to extend the heating time. After that, the heating time can be extended by a predetermined time to end the heating.

[0013]

As is apparent from the above description of the embodiment, according to the present invention, the temperature change amount calculating means for obtaining the change amount of the temperature of the water contained in the container based on the output of the temperature detecting means, A temperature change amount comparison means for comparing the output of the temperature change amount calculation means with a predetermined temperature change amount instructing to extend the heating time by a predetermined time after detecting the boiling, and a predetermined heating after detecting the boiling A timing means for measuring time;
Heating control means for controlling the heating means with the outputs of the temperature change amount comparing means and the time measuring means as inputs, wherein the temperature control means controls the temperature of the water in the container to a predetermined value. If the temperature changes more than the amount of temperature change, the heating means is controlled so as to extend the heating for a predetermined time after detecting the boiling and then end the heating. Judging that water has been added by the change in the temperature of the water inside, automatically increases the heating for a predetermined time after detecting boiling automatically without the user instructing to extend the heating time. It can remove chlorine odor.

[Brief description of the drawings]

FIG. 1 is a block diagram of an electric water heater according to one embodiment of the present invention.

FIG. 2 is an operation flowchart of the electric water heater.

FIG. 3 is a block diagram of a conventional electric water heater.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Container 2 Heating means 3 Temperature detecting means 4 Temperature comparing means 5 Boiling detecting means 6 Clocking means 9 Temperature change amount calculating means 10 Temperature change amount comparing means 11 Heating control means

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) A47J 27/21 101

Claims (1)

(57) [Claims] 1. A container having a bottomed cylindrical shape, heating means for heating water contained in the container, temperature detecting means for detecting the temperature of water contained in the container, and said temperature detecting means Temperature comparison means for comparing the temperature of the water contained in the container with a predetermined temperature by using the output of the container as an input, and detecting that the water contained in the container has boiled by the output of the temperature detecting means. Boiling detection means, temperature change amount calculation means for obtaining the change amount of the temperature of the water contained in the container based on the output of the temperature detection means, and an output of the temperature change amount calculation means and a predetermined temperature change amount. A temperature change amount comparing means, a time measuring means for measuring a predetermined heating time after detecting boiling, an output of the temperature comparing means, the boiling detecting means, the temperature change amount comparing means, and an output of the time measuring means. To control heating means Heating control means for performing heating when the change in temperature of the water in the container is equal to or greater than a predetermined temperature change amount, and detects boiling when the boiling detection means detects boiling. An electric water heater that terminates heating after a lapse of a predetermined time.