JPH0449917A - Water heater - Google Patents

Abstract

PURPOSE:To remove firmly chlorine elements out of water supply water and to provide hot water most suitable for tea by providing a temperature detector, a boiling detector and a heater driving means which carries out warmth retaining control and boiling control and puts the boiling control prior to the warmth keeping control. CONSTITUTION:A controller 16 is provided with a first reference temperature deciding means 39 for receiving temperature signal of a temperature detector 12 and comparing it with a first reference temperature signal and a second temperature deciding means 40 for comparing the temperature signal with a second reference temperature signal which is lower than the first reference temperature signal. The controller 16 is further provided with a heater driving means which turns a heater 3 ON when a temperature signal is lower than the second reference temperature signal in the second temperature deciding means 40 and makes boiling control by which the heater 3 is turned OFF if a prescribed time period elapses after input of boiling signal of the boiling detector 3 and priority control by which the boiling control is put prior to warmth retaining control. By this, hot water is boiled long enough to remove firmly chlorine elements out of water supply water, whereby hot water most suitable for tea without smell can be supplied. If the boiling time is set to be 3 minutes, the hot water is never overboiled, whereby nice tea can always be served.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a water heating device used in a tea dispenser for dispensing tea.

BACKGROUND OF THE INVENTION In recent years, tea dispensers that store hot water in a tank and supply a predetermined amount of hot water to tea leaves to extract tea have become widely used in tea houses, restaurants, and the like. For example, this is
This method is disclosed in Japanese Utility Model Application Publication No. 90 and Japanese Utility Model Application No. 60-73433. The hot water stored in the tank of this tea dispenser uses a thermostat or thermistor to detect the temperature of the water in the tank and control the heater so that the tea is always ready for drinking.
It is kept at a temperature of 86 to 90 degrees Celsius, which is lower than that of Kaserteng Onpi.

Problems to be Solved by the Invention However, there are problems in that keeping the water at a temperature of 86 to 90°C does not sufficiently remove chlorine from tap water, and the flavor of tea deteriorates due to the odor of pulp elements. Ta.

In view of the above problems, the present invention reliably removes chlorine from tap water and provides hot water that is optimal for tea.

Means for Solving the Problems To achieve this object, the water boiler of the present invention includes a temperature detector, a boiling detector, a heater drive that performs heat retention control and boiling control, and gives priority to boiling control over heat retention control. It consists of means.

Function: With this configuration, water can be boiled for an appropriate amount of time, chlorine content in tap water can be reliably removed, and hot water without odor can be provided, which is perfect for tea.

EXAMPLE An example of the present invention will be described below with reference to the drawings.

FIG. 1 is a configuration diagram of a water heating apparatus in an embodiment of the present invention. This example shows the case where it is used in a tea dispenser. 1
2 is a tea dispenser, 2 is a tank for storing hot water, and a heater 3 is installed on the bottom surface.

4 is a hot water supply pipe, and a hot water supply pulp 5 for controlling hot water supply is provided between the pipes. 6 is a hot water supply port provided at the tip of the hot water supply pipe 4. 7 is a tea strainer located directly below the hot water inlet and stores tea leaves, and 8 is a hot water cup.

Reference numeral 9 is a hub for supplying new tea confectionery, and 1o is a tea leaf exchanging device, which has a built-in guard motor 11.

Reference numeral 12 denotes a temperature sensor which is arranged closely on the outer wall of the tank and detects the temperature of the hot water inside the tank. Reference numeral 13 designates a boiling detector which is installed on the outer wall of an overflow pipe 16 which has one end opened at the upper side of the tank 2 and the other end opened into the drain tank 14, and detects steam caused by boiling. 16 is a control device.

The control device 16 includes a first temperature determining means 3 that inputs the temperature signal from the temperature sensor 12 and compares it with a first reference temperature signal.
9, a second temperature determination means 40 for inputting the temperature signal from the temperature sensor 12 and comparing it with a second reference temperature signal lower than the first reference temperature signal; heat retention control that turns on the heater when the temperature signal is low and turns off the heater when the temperature signal is high;
The 21st ML degree determining means 40 turns on the heater 3 when the temperature signal is lower, and turns the heater 3 off after a predetermined time after inputting the boiling signal from the boiling detector 13.
It is comprised of a heater driving means 41 that performs boiling control that performs F and priority control that prioritizes boiling control over heat retention control.

Next, the electric circuit shown in FIG. 2 will be explained.

17 is a power switch, the heater 3 and temperature fuse 20 are connected in series through the normally open contact 19 of the first relay 18, the hot water pulp 5 is connected through the tea switch 21, and the second relay 22 is normally open. The geared motor 11 of the tea leaf exchanging device 10 is connected via the open contact 23, and the primary side of the power transformer 724 in the control device 16 is connected. The power supply circuit 24 is connected to the secondary side of the power transformer 724. The control device 16 has the temperature detector 12 and the boiling detector 13 as inputs.

The temperature sensor 12 is an NTC therminuta, and has a negative temperature characteristic in which the electrical resistance decreases as the temperature of the object to be detected increases and the electrical resistance increases as the temperature decreases. One end of the temperature sensor 12 is connected to a DC power source V. 0, and the other end is grounded via a resistor R1. The connection point A between the temperature sensor and the resistor R1 is branched into two,
Inverting input terminal of comparator 26 and comparator 27
are connected to the inverting input terminals of each. A resistor R2 and a resistor R3 are connected to the non-inverting input terminal of the converter 26, and the other end of the resistor R2 is connected to a DC power supply V. 0 and the other end of the resistor R3 is grounded, and a first reference voltage (first reference temperature signal) for heat retention control.
is making. The first reference voltage has hysteresis and maintains the hot water temperature at 90±3°C. Similarly, a resistor R4 and a resistor R6 are connected to the non-inverting input terminal of the comparator 27, the other end of the resistor R4 is connected to the DC power supply vco, and the other end of the resistor R6 is grounded. A second reference voltage (second reference temperature signal) for boiling control is created. Note that the second reference voltage is lower than the first reference voltage, and is set to be able to determine the temperature of the hot water in the tank 2 at 80°C. The comparator 2
The output terminal of 6 is the input terminal a of the microcomputer 28.
The output terminal of the comparator 27 is connected to the input terminal of the microcomputer 28. One end of the boiling detector 13 is connected to a DC power source V. 0, and the other end is grounded via a resistor R6 and connected to the input terminal C of the microcomputer 28. Output terminals d and e of the microcomputer 28 are connected to buffers 129 and 3.
0 to a first relay 18 having a normally open contact 19 and a second relay 22 having a normally open contact 23 .

The water heating apparatus configured as described above will be explained using the flowchart of FIG. 3 and the timing chart of FIG. 4.

First, when the power is turned on, the water in the tank 2 is at room temperature, the electrical resistance of the temperature detector 12 is R2, and the potential at point A is v2.
．． It is. Therefore, in step 31, the potential at point A is lower than the boiling control reference voltage 2 (80), so the output of the comparator 27 is H, and the micro comparator 28
Input terminal bKH7j: Input. Here, since the potential at point A is lower than the first reference voltage (v9°) for heat retention control, the output of the comparator 26 is set to H. B is also input to the input terminal a of the microcomputer 28; Since the program preset in step 28 gives priority to the 'SS sub-control over the heat retention control, boiling control is entered and the process proceeds to step 32. Then, in step 32, the pressure terminal dKH is output according to a program set in advance in the microcomputer 28, the first relay 18 is turned on via the buffer 29, and the normally open contact 19 is turned on.
is closed and the heater 3 is turned on. The water in the tank 2 is heated by the heater 3 and its temperature rises. When boiling occurs, steam is violently generated, and the boiling detector 13 installed on the outer wall of the overflow pipe 15 is turned off due to the heat of the steam, and in step 33, the input terminal C of the microcomputer 28 is turned off.
L is input to . In step 34, according to a program preset in the microcomputer 28, three minutes after L is input to the input terminal C, the output terminal d is
is set to L, and in step 35, the first relay 18 is turned off via the buffer 729, the normally open contact 19 is opened, and the heater is turned off to complete the boiling control.

Next, the process returns to step 31. At this time, the hot water in the tank 2 is 100°C, and the electrical resistance of the temperature detector 12 is Rloo
, and the potential at point A is vl. . It is.

Therefore, since the potential at point A is higher than the second reference voltage (v8°) for boiling control, the process proceeds to step 36 and heat retention control is performed.

When the temperature of the hot water in the tank 2 decreases to 87°C or less due to heat radiation, the electrical resistance of the temperature sensor 12 becomes larger than R8□, and the potential at point A becomes lower than the first reference voltage (v8□), so the comparator 26 The output becomes H, and the input terminal aKH of the microcomputer 28 is input. and,
In step 37, a program preset in the microcomputer 27 outputs H to the output terminal d, turns on the first relay 18 via the buffer 29, closes the normally open contact 19, and turns on the heater 3. Then, when the temperature of the water in the tank 2 rises to 93°C or higher, the electric resistance of the temperature sensor 12 becomes smaller than R93, and the potential at point A becomes the first reference voltage (v93) in step 36.
Since the output of the comparator 26 becomes higher, the output of the comparator 26 becomes higher. The microcomputer 28 outputs L to the output terminal d, turns off the first relay 18 via the buffer 29, opens the normally open contact 19, and turns off the heater 3 in step 38.
L. Return to step 31.

Then, when the user turns on the tea nwitch 21, the hot water supply pulp 6 is activated, and the hot water in the hot water tank 2 is poured from the hot water supply port 6 into the tea strainer 7, passes through the tea confectionery stored in the tea strainer 7, and makes tea. is supplied to a container such as a hot water cup 8. Here, since the tea confectionery in the tea strainer 7 becomes runny when an appropriate amount of tea is supplied, the microcomputer 28 is programmed in advance so that the confectionery is automatically supplied from the hopper 9 after a certain amount of tea has been supplied. It is something that exists.

As described above, according to this embodiment, by providing a temperature detector, a boiling detector, and a heater driving means that performs heat retention control and boiling control and prioritizes boiling control over heat retention control, hot water is properly controlled. It boils for hours to reliably remove chlorine from tap water, providing odor-free hot water that is perfect for tea. In addition, by setting the boiling time to 3 minutes, no increase in hardness or decrease in the amount of oxygen content due to boiling of the water due to overboiling will occur, and the flavor will not be adversely affected. Therefore, delicious tea can always be provided.

In addition, boiling control is performed when the water temperature signal detected by the thermistor is lower than the second reference temperature signal, so when the power is turned on after a long period of non-use, or when a power outage returns, the water temperature is lower than the second reference temperature to ensure boiling. This process makes the hot water suitable for tea, and has great hygienic effects. In addition, even when water is added to the hot water tank, the water temperature is lower than the standard temperature 2, so it is ensured that the water is boiled and the chlorine content is removed, making the water suitable for tea. Therefore, boiling control can be performed whenever necessary.

In addition, since heat retention control is performed by circuit processing the water temperature signal detected by the thermistor, there is no large fluctuation in water temperature unlike with conventional thermostats, and stable heat retention control is possible by minimizing the generation of steam. be.

In addition, by prioritizing boiling control over heat retention control,
Boiling control is reliably performed for a predetermined period of time.

Effects of the Invention As described above, the present invention includes a heater provided in a tank, a temperature detector that detects the temperature of water in the tank, a boiling detector that detects boiling, and a temperature signal from the temperature sensor and a temperature signal. 1
a first temperature determination means that compares a reference temperature signal; and a second temperature determination means that compares a temperature signal from the temperature sensor with a second reference temperature signal that is lower than the first reference temperature signal.
a second temperature determination means for comparing the reference temperature signal with the first temperature determination means, the heater is turned on when the temperature signal is lower, and the heater is turned off when the temperature signal is higher;
the heater is turned on when the temperature signal is lower in the second temperature determination means, and the heater is turned off a predetermined time after inputting the boiling signal from the boiling detector;
The system consists of a boiling control system that performs boiling and a heater drive means that performs priority control that prioritizes boiling control over heat retention control, and boils water for an appropriate amount of time to reliably remove chlorine from tap water and eliminate odors. It can supply the perfect amount of hot water for tea. Also,
By setting the boiling time to 3 minutes, there will be no increase in hardness or decrease in the amount of oxygen content due to boiling of the water due to overboiling, and the flavor will not be adversely affected. Therefore, delicious tea can always be provided.

In addition, since boiling control is performed when the water temperature detected by the thermistor is lower than the second reference temperature signal, it is certain that the water temperature will be lower than the second reference temperature when the power is turned on after a long period of non-use or when a power outage returns. The water is boiled to make the water suitable for tea, and it has great hygienic effects. At the same time, even when water is added to the hot water tank, the water temperature is lower than the second standard temperature, so it is ensured that the water is boiled and the chlorine content is removed, making the water suitable for tea. Therefore, boiling control can be performed whenever necessary.

In addition, by prioritizing boiling control over heat retention control,
Boiling control is reliably performed for a predetermined period of time, and its practical effects are significant.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram of a water heating device according to an embodiment of the present invention, Fig. 2 is an electric circuit diagram of the device, Fig. 3 is a flowchart showing the operation of the device, and Fig. 4 is a diagram showing the operation of the device. FIG. 2...Tank, 3...Heater, 12.
...Temperature detector, 13...Boiling detector,
39...First temperature determination means, 4o...
Second temperature determination means, 41...Hit drive means. Name of agent: Patent attorney Shigetaka Awano and one other person - Taon It Tsuzuke Tsukasa Tomoe Neighborhood Jochi Tomoe Figure 2 Figure 4 road

Claims (1)

[Claims] A tank for storing hot water, a heater provided in the tank, a temperature detector for detecting the temperature of the water in the tank, a boiling detector for detecting boiling, a temperature signal from the temperature sensor, and a first reference temperature signal. a first temperature determination means for comparing the temperature signal from the temperature sensor and a second reference temperature signal lower than the first reference temperature signal; The heater is turned on when the temperature signal is lower, and the heater is turned off when the temperature signal is higher.
The heater is turned on when the temperature signal is lower in the second temperature determining means, and the heater is turned on after a predetermined time after inputting the boiling signal from the boiling detector.
A water boiler comprising boiling control that turns off, and heater drive means that performs priority control that prioritizes boiling control over heat retention control.