JPH04292123A - Electric hot-water heater - Google Patents

Abstract

PURPOSE:To obtain the electric hot-water heater which can allow a temperature of a liquid whose boiling is finished once to reach an arbitrary set warming temperature, when an arbitrary set time elapses. CONSTITUTION:The hot-water heater is provided with a warning setting means 8 for setting a warning temperature, a setting means 6 for setting the time for reaching a set warning temperature after boiling once, and a room temperature detecting means 7 for detecting a room temperature, and also, provided with a time comparing means 10 for inferring the time when a temperature falls to the set warming temperature from outputs of the warming setting means and the room temperature detecting means, when a warming temperature desired to reach after boiling and the time for allowing a temperature to fall to the warming temperature are set, and determining a hot water heating start time so that the set warming temperature is obtained.

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 a liquid contained in a container warm.

0002

[Prior Art] In recent years, electric water heaters of this type have a setting means and a timer means, and start boiling water when the time set by the setting means has elapsed, or start boiling water at a set time. There is.

0003

[Problems to be Solved by the Invention] However, with such a conventional structure, there are the following problems in those having a function of setting a plurality of insulating temperatures, which have become popular in recent years.

In other words, when the set temperature is low, it is common practice to naturally cool down to the set temperature after boiling has finished, so when the set temperature is low and the surrounding air temperature is high, cooling takes several hours. There are cases. If you set this with a conventional timer, it would take several hours after the end of boiling to reach the required temperature, making it impossible to provide hot water at the required temperature for the time required by the user. It was not easy to use.

[0005] Therefore, the present invention detects the room temperature that has a large effect on cooling, determines the cooling time corresponding to this, and sets the heating start time taking this cooling time into account, thereby setting the time to the time desired by the user. The primary objective is to provide hot water at a warm temperature.

[0006] Furthermore, if the set temperature is not reached even after the set temperature control end time has elapsed due to a change in the amount of water during temperature control, etc., the second function is to notify the user when the temperature has been reached. The purpose of

[0007]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a container for containing a liquid, a heating means for heating the liquid in the container, and a temperature detection means for detecting the temperature of the liquid. , boiling detection means for detecting boiling of the liquid based on the output of the temperature detection means and stopping the heating means;
a heat retention setting means for setting a heat retention temperature of the liquid after the end of boiling; a room temperature detection means for detecting the temperature outside the container; a setting means for setting a temperature control end time until reaching the heat retention temperature after the end of boiling; a time setting means for determining a heating start time based on the outputs of the room temperature detection means and the heat retention setting means when the setting means is input; and a time setting means for measuring the time from when the setting means is input until the temperature control end time. and a time comparing means for driving the heating means when the heating start time is reached by the timing means.

[0008] Also, a notification means for notifying by sound or light;
Temperature comparing means is provided which uses the temperature detecting means as an input, the time measuring means measures the end time of temperature control, and turns on the notifying means when the liquid reaches the set heat retention temperature.

[0009]

[Function] With the above configuration, the present invention calculates the time required for cooling by setting the room temperature and heat retention temperature, which have a large effect on cooling, and sets the time to start heating by adding the heating time to this. Hot water at a preset temperature can be easily provided at a preset time.

[0010] Also, due to variations in heating time or changes in the amount of water during temperature control, if the set temperature has not yet been reached when the set time has been counted, the end of temperature control is not notified, and the temperature control is not completed. By notifying the end of temperature control when the temperature has been reached, it is possible to reliably provide hot water at the set temperature.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention, in which 1 is a temperature detecting means for detecting the temperature inside the container 2, and 3 is a boiling detecting means for detecting boiling from the output of the temperature detecting means 1. be. 4 is a heating means for heating the liquid in the container;
It is driven by the output of the time comparison means 10 and stopped by the output of the boiling detection means 3.

Reference numeral 7 denotes a room temperature detection means for detecting the room temperature around the container 2. 8 is a heat retention setting means for setting an arbitrary heat retention temperature. Reference numeral 5 denotes a time setting means for setting the time required from the start of heating to the end of temperature adjustment based on the temperature detected by the room temperature detection means 7 and the temperature set by the heat retention setting means 8. Reference numeral 9 denotes a timer means for measuring the time until the end of temperature control.

Reference numeral 6 is a setting means for setting a time to finish controlling the temperature of the liquid in the container 2 to a desired temperature after the end of boiling in the timer means, and setting the time from the start of heating to the end of temperature control to the time setting means 5. let Reference numeral 10 denotes a time comparing means, which compares the value of the clocking means 9 with the value of the time setting means 5, and drives the heating means 4 based on the result. Reference numeral 11 denotes a temperature comparison means, which determines whether the output of the temperature detection means 1 has reached a set heat retention temperature. The notification means 12 notifies the outside of the temperature control using sound, light, etc. when the temperature control is completed.

FIG. 2 is a specific circuit diagram showing one embodiment of the present invention. In the figure, 16 is an AC power source. The temperature detection means 1 is composed of a thermistor 1a whose resistance value changes depending on the temperature, a resistor 1b which divides the voltage of the thermistor 1a, and an AD converter 1c which receives the voltage divided value as input. It is converted into a binary code set for each predetermined temperature range (here, 0.5 degrees).

The boiling detection means 3 determines that the temperature has stopped rising when the temperature range does not change after a predetermined period of time (approximately 25 seconds in this case) based on this output, and detects boiling. Like the temperature detecting means 1, the room temperature detecting means 7 also includes a thermistor 7a, a resistor 7b, and an AD converter 7c, and here too, the temperature is set at 2° C. for each predetermined temperature range (here, 5 degrees). Converting to decimal code.

The heating means 4 is composed of a heating element 4a, a relay coil 4b for controlling energization, and a relay contact 4c. The setting means 6, the heat retention setting means 8 and the starting means 13 are respectively composed of switches 6a, 8a, 13a and resistors 6b, 8b, 13b.
, 13a, an H signal is output. The starting means 13 causes the time measuring means 9 to start counting the time until the end of temperature control.

The display means 14 displays the temperature control end time (in this embodiment, there are two types, 6 hours and 8 hours) determined by the setting means 6 using LEDs 14a and 14b and a resistor 14.
It is displayed as c. The notification means 12 includes a buzzer 12a that notifies the end of temperature control and an LED that displays the set heat retention temperature.
12b, 12c (in this example, two angles of 95 and 85 degrees)
Type. ).

Reference numeral 15 denotes a microcomputer (hereinafter abbreviated as microcomputer), which constitutes the boiling detection means 3, the time setting means 5, the time measurement means 9, the time comparison means 10, and the temperature comparison means 11, and which executes a program. Achieve these functions by executing Next, the flow of the process will be explained with reference to FIG.

When the setting means 6 is turned on during warming or heating (step 51), the microcomputer 15 performs time setting processing. Here, the temperature control end time (6 hours in this embodiment) is set in the clock means 9, and this value is set in the display means 14.
(LED that indicates the end of boiling in 6 hours) (step 52). Next, in step 53, the setting input of the heat retention temperature is determined, and if there is an input, the display of the notification LED is changed in the order of 95 → 85 → 95, etc. (step 54). Next, in step 55, an input from the starting means 13 is waited for, and if there is no input, the process returns to step 51.

When the start means 13 receives an input in step 55, a heating start time T is set by the room temperature detection means 7 and the heat retention setting means 8 (step 56). In step 57, the value of the timer 9 is subtracted by a predetermined period of time (one minute in this embodiment). When the subtraction is performed in step 57, the time measuring means 9 subtracted in step 58
The value T of the time setting means 5 is compared with the value T of the time setting means 5, and if the value of the time measuring means 9 is not less than T, steps 57 and 58 are repeated until it becomes less than T.

When the value of the timer 9 becomes equal to or less than T in step 58, the heating means 4 is driven in step 59,
While repeating the subtraction process in steps 60 and 61, it waits for boiling to be detected. When boiling is detected in step 61, the heating means 4 is stopped. (Step 62) Next,
At steps 63 and 64, the subtraction process is performed while waiting for the timer 9 to reach 0. Here, when the time measurement means 9 becomes 0, steps 65 and 66 are performed to detect the temperature detection means 1.
It is determined whether the set temperature has been reached by inputting the value of , and when the set temperature is reached, the notification means 12 is turned on in step 67 to end the temperature control.

As is clear from the above embodiment, the first and second terms can be configured with a simple configuration. In this embodiment, there are only two types of time that can be set, but it is possible to freely set the time in units of one minute, for example, and the display means can also be displayed in units of one minute using an LCD or the like. It is also possible to do so. Further, although the timer starts counting the time by the start means, there is also a method in which the timer starts counting at the same time as the setting means is input. Furthermore, in detecting a change in the amount of water, the amount of water may be detected not only when the lid is opened or closed, but also when hot water is detected.

[0024]

[Effects of the Invention] As is clear from the above embodiments, according to the present invention, the cooling time is calculated from the room temperature and the set heat retention temperature, and the value obtained by adding the time required for heating to this is subtracted from the set time. Since the heating start time is determined based on the heating temperature, the liquid in the container can be brought to the required heat retention temperature after a predetermined period of time has elapsed. In this way, boil once for the required time,
Moreover, it is possible to provide hot water at a keeping temperature set to a desired temperature.

[0025] Also, even if the end of the temperature control is delayed from the set time due to an increase or decrease in the amount of water during heating or temperature control, the operation will continue until the set temperature is reached, and furthermore, an end notification will be issued when the temperature control is completed. You can also do

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an electric water heater in one embodiment of the present invention.

[Figure 2] Specific circuit diagram of the electric water heater

FIG. 3 is a flowchart showing the process of the electric water heater.

[Explanation of symbols]

1 Temperature detection means 3 Boiling detection means 4 Heating means 5 Time setting means 6 Setting means 7 Room temperature detection means 8 Heat retention setting means 9 Timekeeping means 10 Time comparison means 11 Temperature comparison means 12 Notification means

Claims (2)

[Claims] 1. A container for storing a liquid, a heating means for heating the liquid in the container, a temperature detection means for detecting the temperature of the liquid, and a boiling of the liquid is detected based on the output of the temperature detection means. boiling detection means for stopping the heating means; heat retention setting means for setting the temperature at which the liquid remains after boiling; room temperature detection means for detecting the temperature outside the container; a setting means for setting a temperature control end time, a time setting means for determining a heating start time based on each output of the room temperature detection means and the heat retention setting means when the setting means is input; An electric water heater comprising: a timer for measuring the time from the time to the temperature control end time; and a time comparison means for driving the heating means when the timer reaches the heating start time. 2. A notification means for notifying by sound or light, and a timer using the temperature detection means as an input, the timer measures the end time of temperature control, and turns on the notification means when the liquid reaches a set heat retention temperature. An electric water heater according to claim 1, further comprising temperature comparison means for comparing temperature.