JPH01160508A - Electric air pot - Google Patents

Abstract

PURPOSE: To enable to quickly supply a relatively low temperature hot water by activating an air-supply device when a select switch is switched to the low temperature side after boiling, and by inactivating the air-supply device when a temperature detection means detects a retaining temperature set to the low temperature side. CONSTITUTION: An air-supply pipe 41 is vertically extended from a pump 40 provided at the bottom of a vessel body 6 so that the opening of the air-supply pipe 41 is higher than a liquid level, and the pump 40 serves as both air-supply device and hot-water supply pump. A heater 7 and a heat retaining heater 8 are energized to boil water in a vessel 1, and a CPU 50 turns off transistors 25 and 28 to turn off the heater 7 and the heat retaining heater 8. Whether a select switch 2 is switched to 70 deg.C side or 90 deg.C side is determined. and when 70 deg.C side, the pump 40 is turned on as an air-supply device. Air fed in pressure from the pump 40 is passed through the air-supply pipe 41 and delivered to a space above a liquid level in the vessel 1, and air and steam heated by hot water is delivered to the outside through a steam pipe 14 and the hot water is cooled. When a temperature of the hot water is lower than 70 deg.C, the pump 40 is turned off to adjust a temperature of the hot water to 70 deg.C.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to an electric airpot.

(Prior art) Conventionally, electric air pots have been provided with several settings for maintaining the temperature of hot water after boiling, such as 90'C or higher and 70°C, and can be selected by switching as appropriate depending on the application. There is something like this. That is, after boiling water with an electric heater, the water is allowed to cool naturally, and then the temperature is adjusted to a selected heat retention temperature by controlling the heat retention heater on and off.

(Problem to be solved by the invention) However, with conventional electric air pots, it takes about 3 hours for the temperature to drop to, for example, 70'C due to natural cooling after boiling, so when hot water at 70°C is urgently needed. teeth,
It was really inconvenient to have to replenish the water or pour out only the required amount and let it cool.

The present invention was made in view of such problems, and an object of the present invention is to provide an electric air pot that can rapidly supply hot water at a relatively low temperature.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a changeover switch 2 that can appropriately select and switch between several heat retention temperatures, as shown in FIG. , a temperature detection means 3 for detecting the temperature of the hot water in the container l, an air supply device 4 for supplying air into the container l, and an air supply device when the changeover switch 2 is switched to the low temperature side after boiling. 4, and an air supply device control means 5 that stops the air supply device 4 when the temperature detection means 3 detects a heat retention temperature set on the low temperature side.

(Function) According to the above configuration, if the heat retention temperature is switched and set to the low temperature side by the changeover switch 2, the air supply device control means 5 outputs a drive signal to the air supply device 4 after boiling. In response to this, the air supply device 4 is a container! Supply air into the container 1
The hot water inside is forcibly cooled down. As a result, the temperature of the hot water in the container l rapidly decreases. When the set heat retention temperature is reached, the temperature detection means 3 detects this and issues a stop signal to the air supply device 4. Thereby, it is possible to supply hot water at the keeping temperature set by the changeover switch 2.

(Example) Next, one embodiment of the present invention will be described with reference to the drawings.

FIG. 2 shows an electromagnetic hot water supply type electric air pot according to the present invention, in which a heater 7 and a heat-retaining heater 8 are attached to the bottom of a container 1 housed in a container body 6 via a heating plate 9, and the water temperature is A detector 30 is attached. and,
A lift pipe IO extending from the bottom of the container 1 to the spout 10a is provided upright, and a picture pipe 41 is provided upright that opens above the liquid level of the container l from a pump 40 provided at the bottom of the container body 6. There is. The pump 40 and the wind pipe 41 constitute the air supply device 4 according to the present invention. The pump 40 serves both as an air supply device and a hot water supply pump, as will be described later. Further, a hot water supply switch 11 provided on the shoulder of the container body 6 is a switch for driving the pump 40, and a changeover switch 2 provided on the display section is used to set the heat retention temperature to 90°C4 or 70°C.
The reboiling switch 12 is a switch for starting boiling water.

A steam pipe 14 is provided in a lid 13 that covers the container body 6, so that steam during boiling can be discharged to the outside.

A steam temperature detector 1 is installed near the outlet 15 of this steam pipe 14.
6 is provided. Reference numeral 17 denotes an operation knob for the hot water supply switch 11. When pressed, the suppressing part 18 provided at one end presses the hot water supply switch 11 via the gasket 19, and at the same time, the valve part 20 provided at the other end depresses the hot water supply switch 11 through the valve gasket 19. 21
The inlet 22 of the steam pipe 14 is closed through the pump 40, and the confined space formed above the liquid level in the container 1 is pressurized by the pump 40, so that the hot water in the container 1 is pumped through the pumping pipe IO. The liquid is poured out from the spout 10a.

The electric air pot with the above configuration is configured to boil water, cool water, and keep the water warm using a microcomputer. FIG. 3 is a wiring diagram of each component of this electric airpot and a microcomputer.

The heater 7 is connected to a power source 24 via a relay 23, and the coil of the relay 23 is connected to a central processing unit (hereinafter referred to as CPU) of a microcomputer via a transistor 25.
That's what it means. )50 output terminal. The insulating heater 8 is connected to a power source 24 via a triac 26,
The gate terminal of the triac 26 is connected to the output terminal of the CPU 50 via a phototriac coupler 27 and a transistor 28. Pump 40 is connected to power supply 24 via hot water switch 11 and relay 51 which are connected in parallel, and the coil of relay 51 is connected to the output terminal of CPU 50 via transistor 52. Therefore, the pump 40 operates as a hot water supply pump when the hot water supply switch 11 is pressed, and operates as an air supply device when the transistor 52 is turned on by a signal from the CPU 50 and the contact of the relay 51 is closed. Yes, CPU5
0, the transistor 52 and the relay 51 constitute the air supply device control means 5.

The water temperature detector 30 has its thermistor Rth connected in series with comparison resistors R8, R1, R2, R3, R-, and Rs connected in parallel, and by switching the comparison resistors R and -R5 at a predetermined timing, The resistance change of the thermistor Rth+ is expressed as a change in the partial voltage between the thermistor Rth+, the comparison resistor R6, and the combined resistance of the comparison resistors R1 to R5.
Input to the input terminal of U50, dry cooking, 90°C 180°
Water temperatures of 170°C and 60°C are detected sequentially. The steam temperature detector 16 has its thermistor Rth2
is connected in series with the comparison resistor R, and the resistance change of the thermistor Rthz is inputted to the input terminal of the CPU 50 as a change in the partial pressure between the thermistor Rthy and the comparison resistor R, and the steam temperature at boiling is detected. . Changeover switch 2
is connected to the input terminal of the CPU 50, and the heat retention temperature is 90℃.
The signal indicating whether the temperature is ℃ or 70℃ is manually input.

Next, the water cooling operation by the CPtJ50 will be explained according to the flowchart shown in FIG.

In steps Sll and S12, the CPU 50 outputs an "H" signal to the base of the transistor 25.28 to turn on the transistor 25.28, energizes the coil of the relay 23 and closes its contact, and simultaneously activates the phototriac. By turning on the triac 26 via the coupler 27, electricity is supplied to the heater 7 and the insulating heater 8 to boil the water in the container l. Then, upon receiving a detection signal of the steam temperature at boiling from the steam temperature detector 16,
In step S13, the CPU 50 selects the transistor 25.2.
The output signal to the base of 8 is set to "L" to turn off the transistors 25 and 28, and at the same time the contact of the relay 23 is opened, the triac 26 is turned off, and the heater 7 and the heat-retaining heater 8 are turned off.

Next, in step S14, it is determined whether the selector switch 2 is on the 70°C side or the 90°C side, and if it is on the 70°C side, the base of the transistor 52 is set to "H" in step S15.
By outputting a signal to turn on the transistor 52, energizing the coil of the relay 51 and closing its contacts, the pump 40 is turned on as an air supply device.

As a result, the air pumped from the pump 40 is transferred to the air pipe 4.
As a result, the flow of air and steam is activated in the space above the liquid level, and the air and steam heated by the hot water pass through the steam pipe 14. and is released to the outside.

On the other hand, the hot water that comes into contact with the air in the space above the liquid level loses heat and is cooled.

During this time, the CPU 50 executes step S16. S17゜SI8
Reboil switch 12. The signals from the changeover switch 2 and the water temperature detector 30 are monitored, and the reboiling switch 1 is switched on.
2 is pressed, the changeover switch 2 is switched to the 90℃ side, or the water temperature is increased to 60℃ by adding water.
If it becomes lower than
By turning off the relay 51, the coil of the relay 51 is demagnetized and its contacts are opened, and the pump 40 is turned off and step S
Returning to step 11, the heater 7 and the heat retaining heater 8 are energized to enter the water boiling state in the same manner as described above. If these steps are not carried out, it is determined in step S20 whether the temperature of the hot water is 70°C or higher, and if it is 70°C or higher, it has not cooled down yet, so the process returns to step SI5 and the pump 40 Continue cooling.

If the temperature of the hot water is less than 70°C, the pump 40 is turned off in step S21 as described above, and the temperature of the hot water is adjusted to 70°C in step S22. Here, water temperature detector 3
The temperature of the hot water is maintained within a certain range above and below 70° C. by intermittent energization of the heat-retaining heater 8 based on the detected temperature signal from 0°C. Even during this temperature adjustment, the CPU 50 performs step S23. S2
4. In S25, the water temperature detector 30. The signals from the reboil switch 12 and the changeover switch 2 are monitored, and if the water temperature drops below 60°C due to water addition, the reboiler switch 12 is pressed, or the changeover switch 2 is turned 9.
If it is switched to the 0°C side, the process returns to step Sll and enters the water boiling state.

On the other hand, in step S14, the changeover switch 2 is set to 90°C.
If it is on the side, in step S26, the temperature of the hot water is adjusted to 90°C in the same way as the temperature adjustment to 70°C in step 22. Even during this temperature adjustment, C
The PU 50 performs steps S27 and S28. S 29 Water temperature detector 30° Monitors the signals from the reboiling switch 12 and changeover switch 2, and if the water temperature becomes less than 80'C due to water addition or the reboiling switch 12 is pressed, Return to step Sll and enter the water boiling state.
Also, if the selector switch 2 is switched to the 70°C side,
Returning to step S15, the pump 40 is turned on, and the process moves to a water cooling operation and a temperature control operation at 70°C.

By the way, when the operating knob 17 is pressed, the pressing part 18 presses the hot water supply switch 11 via the gasket 19.
The hot water supply switch 11 is closed regardless of the program operation of the CPU 50, and the pump 40 is turned on as a hot water supply pump. At the same time, the valve portion 20 of the operation knob 17 closes the inlet 22 of the steam pipe 14 via the valve gasket 21, so that the container 1 is sealed. As a result, the air pumped from the pump 40 is discharged through the air supply pipe 41 into the sealed space above the liquid level inside the container 1, and the inside of the container 1 is pressurized. This pressure pushes down the liquid level, and the hot water in the container 1 passes through the water pump 10 and is poured out from the spout 10a.

According to experiments conducted by the present inventors, forced cooling using the pump 40 takes about 1 hour and 10 minutes for hot water to drop to 70°C after boiling, whereas conventional natural cooling takes about 3 hours. It has been confirmed that the cooling time was reduced to about 1/3 compared to the previous one.

In the above embodiment, when the selector switch 2 is on the 90°C side, the temperature is adjusted to 90°C immediately after boiling is completed, but this is because it does not take much time for the temperature to drop to 90°C. , which is left to natural cooling. In order to quickly obtain hot water at 90°C, steps similar to step 915 to step S21 may be inserted between step S14 and step S26.

Further, in the above embodiment, the hot water pump of the electromagnetic hot water supply type electric air pot is also used as the air supply device, but a pump or fan exclusively for the air supply device may be provided separately.

The present invention is not limited to the electromagnetic hot water supply type as in the above embodiment, but can also be applied to a hero's pump type electric air pot.

(Effects of the Invention) As is clear from the above description, according to the present invention, since the hot water is rapidly cooled by the post-boiling air supply device, relatively low temperature hot water can be quickly supplied. It has the effect of being possible.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an electric air pot according to the present invention,
FIG. 2 is a sectional view of an electromagnetic hot water supply type electric air pot according to an embodiment of the present invention, FIG. 3 is a wiring diagram thereof, and FIG. 4 is a control flowchart. l... Container, 2... Changeover switch, 3... Temperature detection means, 4... Air supply device, 5... Air supply device control means, 30... Water temperature detector, 40...・Pump, 4!・
...Air supply pipe, 50...Central processing unit (CPU)
, 51...Relay, 52...Transistor. Patent applicant: Zojirushi Mahobin Co., Ltd. Representative: Patent attorney Mr. Mae and two others Figure 1

Claims (2)

[Claims] (1) A changeover switch that can appropriately select and switch between several heat retention temperatures, a temperature detection means that detects the temperature of hot water in the container, an air supply device that supplies air into the container, and a boiling point. An air supply device that drives the air supply device when the changeover switch is switched to the low temperature side, and stops the air supply device when the temperature detection means detects a heat retention temperature set to the low temperature side. An electric air pot characterized by comprising a control means. (2) The electric air pot according to claim 1, wherein the air supply device also serves as a hot water supply pump.