JPH0345226A - Water boiling device - Google Patents

Abstract

PURPOSE:To enable the concurrent use of a water boiling device with a coffee server or the like of large electric capacity by applying the constitution wherein a heater is turned off upon receipt of the on signal of external equipment even during the operation of the heater via hot water temperature detection, and a hot water feed valve is electrically actuated via a hot water feed operation. CONSTITUTION:A control equipment is constituted with a temperature judgement means 14 for inputting a signal of temperature in a tank 2 detected with a temperature detector 12 and comparing the signal with a reference temperature signal, a heater drive means 40 for supplying power to a heater 3 on the basis of the output of the aforesaid means 14, a priority judgement means 16 for outputting a heater power interruption signal to the heater drive means 40 upon receipt of the on signal 15 of external equipment such as a coffee server, regardless of the value of the temperature signal, and a hot water feed valve drive means 42 for supplying power to a hot water feed valve 5 upon receipt of a signal from a hot water feed switch 17. According to the aforesaid construction, when the coffee server is used, the priority judgement means 16 interrupts power supply to the heater of a tea server upon receipt of the on signal of the coffee server. The electrical systems of the tea server other than the heater thereof are being supplied with electric power, tea is served as the hot water feed valve 5 is operated upon pressing a tea service switch.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to water boiling devices used in tea dispensers for dispensing tea.

BACKGROUND ART In recent years, tea dispensers that store hot water in a tank and supply a predetermined amount of hot water to tea leaves to brew tea have become widely used in offices, restaurants, and the like. For example, this is
It is shown in Publication No. 90.

The hot water stored in the tank of this tea dispenser is controlled by 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 90℃.

Furthermore, office furniture that integrates and houses a tea dispenser, coffee server, refrigerator, etc. has recently become popular.

The above-mentioned unit furniture for office will be explained with reference to FIG. 1' is a tea dispenser, 2' is a coffee server, and 3' is a refrigerator, which are housed in office unit furniture 6' with a top plate 4'. Power for the tea dispenser 1', coffee server 2', and refrigerator 3' is supplied from a power outlet 6' provided in the office furniture unit 5'.

Problem 3 to be Solved by the Invention However, in the configuration described in section 2, when used in a normal office, the capacity of the power outlet is 100V, 1
5A, and the electric capacity of each device stored in the office unit furniture is 1OA for the tea dispenser, 1OA for the coffee server, 2A for the refrigerator, which exceeds the electric capacity, and the refrigerator, tea dispenser, and coffee server need to be installed at the same time. The problem was that it could not be used.

In order to solve the above-mentioned problems, the present invention provides a water boiling device for a tea dispenser that allows a refrigerator, a coffee server, and a tea dispenser to be used at the same time.

Means for Solving the Problems To achieve this object distantly, the water heating device of the present invention includes a hot water storage tank covered with a heat insulating material, a heater provided in the tank,
a temperature detector for detecting the temperature of hot water in the tank; a hot water supply valve for supplying the hot water in the tank; a temperature determining means for comparing a temperature signal from the temperature detector with a reference temperature signal; a heat retention control means for energizing the heater; a priority determination means for receiving an ON signal from an external device and outputting a signal to the heater driving means to stop the energization of the heater regardless of the value of the temperature signal; and a signal from a hot water supply switch. The hot water supply control means energizes the hot water supply valve.

Effect: With this configuration, while the coffee server is in use, the tea dispenser receives the coffee server ON signal and the priority determining means stops energizing the heater. All functions of the tea dispenser except the heater are energized, so when you press the tea supply switch (hot water supply switch), the hot water supply valve operates and tea is supplied. Therefore, it is possible to use the refrigerator, coffee server, and tea dispenser at the same time.

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

FIG. 1 is a block diagram of a water heater according to 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 hot water storage tank covered with a heat insulating material 39 such as glass wool, and 5 is a heater 3 disposed on the bottom surface. 4 is a hot water supply pipe, and a hot water supply valve 5 for controlling hot water supply is provided between them. 6 is a hot water supply port provided at the tip of the hot water supply pipe 4. 7 is located directly below the hot water supply port and is used to store tea leaves. A tea strainer, 8 is a hot water cup, 9 is a hopper for supplying new tea leaves, and 10 is a tea leaf exchange device, which has a geared motor 11 built therein.

Reference numeral 12 denotes a temperature sensor which is disposed in close contact with the outer wall of the tank and detects the temperature of the water inside the tank 2. 13 is a control device.

The control device 13 includes a temperature determining means 14 that inputs the temperature signal from the temperature detector 12 and compares it with a reference temperature signal, a heater driving means 40 that energizes the heater 3 based on the output of the temperature determining means 14, and a coffee server. priority determination means 16 which receives an ON signal 15 from an external device and outputs a energization stop signal for the heater to the heater drive means 40 regardless of the value of the temperature signal; and a hot water supply valve driving means 41 that energizes.

6/ Figure 2 is an example of a specific electric circuit. 18 is a power switch, the heater 3 and a temperature fuse 21 are connected in series through the normally open contact 20 of the first relay 19, and the hot water supply valve 5 is connected through the button brown switch (hot water supply switch) 17. The geared motor 11 of the tea leaf exchanging device 10 is connected via the normally open contact 24 of the second relay 23, and the primary side of the power transformer 26 in the control board 25 is connected.

A power supply circuit 27 is connected to the secondary side of the power transformer 26. The control board 25 has the temperature detector 12 and an external device ON signal input terminal 28 as inputs. The temperature sensor 12 is an NTC thermistor, 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 supply v11, and the other end is grounded via a resistor R1. The connection point A between the temperature sensor and the resistor R1 is connected to the comparator 2.
It is connected to the inverting input terminal of 9. Comparator 29
A resistor R2 and a resistor R3 are connected to the non-inverting input terminal of the resistor R2 and a resistor 7, and the other end of the resistor R2 is connected to a DC power source (2). 0, and the other end of the resistor R3 is grounded, creating a reference voltage (reference temperature signal) for heat retention control. The output terminal of the comparator 29 is connected to the input terminal a of the microcomputer 30. One end of the external device ON signal input terminal 28 is a DC power source ■. 0, and the other end is grounded via a resistor R4 and connected to the input terminal of the microcomputer 30. Tea dispenser 1 of the external device ON signal terminal 28
The external side of the main body is connected to an external device ON contact 32 that closes when an external device 31 such as a coffee server is energized. Output terminals C and d of the microcomputer are connected via buffers 33 and 34 to a first terminal with a normally open contact 20.
It is connected to a second relay 23 having a relay 19 and a normally open contact 24 .

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

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 large, and the voltage at point A is lower than the reference voltage. Therefore, in step 35, H is input to the input terminal a of the microcomputer 30. Next, in step 36, it is checked whether the external device ON signal is turned ON. If the external device 31 is in the OFF state, the external device ON contact 32 is open, so the external device O
The N signal is turned OFF, and the process proceeds to step 37.

In step 37, a program preset in the microcomputer 30 causes the output terminal C to be
is output, and the first relay 19 is turned on via the buffer 33.
L. Close the normally open contact 20 and turn on the heater 3. Then, as the temperature of the water in the tank 2 rises, the electrical resistance of the temperature sensor 12 decreases, and in step 36, the voltage at point A becomes higher than the reference voltage, so the output of the comparator 29 becomes 1 dLK. The microcomputer 30 has an output terminal C.
The first relay 19 is turned OFF via the buffer 33 to close the normally open contact 20, the heater is turned OFF in step 38, and the process returns to step 369 H-7.

In step 36, the A point voltage is lower than the hot water temperature setting and lower than the reference voltage, so when the process proceeds to step 36, if the external device 31 is in use, the external device ON contact 32 is closed, so the external device ON contact 32 is closed. The device ON signal is not turned on, and the process proceeds to step 38, where the heater continues to be turned off. This state continues at 1 when the external device ON signal turns OFF.

Then, when the user turns on the tea switch 17, the hot water supply valve 5 operates, and the hot water in the hot water tank 2 is poured through the hot water supply port 6 and into the tea strainer 7, and passes through the tea confectionery stored in the tea strainer γ. Tea is supplied to a container such as a hot water cup. Here, since the tea confectionery in the tea strainer 7 becomes waste when a suitable 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.

As described above, according to this embodiment, the heater is turned on regardless of the value of the temperature signal from the temperature sensor upon receiving the external device ON signal.
10 ・＼ By providing a priority determination means to switch to FF, when a refrigerator, coffee server, and tea dispenser are stored and used in office unit furniture as shown in Figure 4, when the coffee server is energized, the tea dispenser is An external device ON signal is input. Therefore, the heater of the tea dispenser is turned off even if the heater is in the N state. Since all functions of the tea dispenser other than the heater are energized, pressing the tea switch will provide tea at a drinkable temperature, making it possible to use the refrigerator, coffee reservoir, and tea dispenser at the same time. The total current consumption when used simultaneously is 2A for the refrigerator and 10A for the coffee server.
, the tea dispenser (excluding the heater) has a total of 12A, and the power outlet capacity is less than 16A, so problems such as tripping of the breaker will not occur. In addition, if the hot water tank is surrounded by a glass whirlpool that is 10 cm thick, the water temperature can be adjusted by turning off the heater for 30 minutes.
However, the decrease due to heat radiation is about 3° C., which poses no practical problem.

As described above, the present invention provides a hot water storage tank covered with a heat insulating layer,
A heater installed in the tank, a temperature sensor that detects the temperature of the hot water inside the tank, a hot water supply valve that supplies hot water in the tank, and a temperature determination that compares the temperature signal from the temperature sensor with a reference temperature signal. means, heat retention control means for energizing the heater based on the output of the temperature determining means, and priority for outputting a energization stop signal for the heater to the heater driving means upon receiving an external device ON signal, regardless of the value of the temperature signal. and a hot water supply control means that energizes the hot water supply valve in response to a signal from the hot water supply switch, so that equipment such as a refrigerator, coffee server, etc. and a tea dispenser can be used at the same time using the same outlet, Its practical effects are similar to that of a dog.

[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 housing of the device. It is a block diagram of unit furniture for offices. 2...Tank, 3...Heater, 5...
... Hot water valve, 12 ... Temperature detector, 14
... Temperature judgment means, 15 ... External device ON signal, 16 ... Priority judgment means, 17 ...
...Hot water switch, 39...Insulation material, 40.
. . . Heater driving means, 41 . . . Hot water supply valve driving means.

Claims (1)

[Claims] A hot water storage tank covered with a heat insulating material, a heater provided in the tank, a temperature sensor that detects the temperature of hot water in the tank, a hot water supply valve that supplies hot water in the tank, and a temperature signal from the temperature sensor. temperature determination means for comparing the reference temperature signal;
heater drive means for energizing the heater based on the output of the temperature determination means; and priority determination means for receiving an external device ON signal and outputting a energization stop signal for the heater to the heater drive means regardless of the value of the temperature signal. and a hot water supply control means that energizes a hot water supply valve in response to a signal from a hot water supply switch.