JP2003190016A - Electric pot - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve usability by enabling to heat water even in a thermos heat-retention state. <P>SOLUTION: This electric pot is provided with an inner container of adiabatic structure capable of water heating and thermos heat-retention, a water heating means for heating the inner container when water heating, a heat-retention temperature setting means for setting the heat-retention temperature of hot water within the inner container, a heat-retention heating means for heating the inner container at the time of ordinary heat-retention, a hot water temperature detecting means for detecting the hot water temperature within the inner container at the time of ordinary heat-retention and thermos heat-retention, and a heat-retention selecting means for arbitrarily selecting an ordinary heat- retention state of the inner container and the thermos heat-retention state, wherein a water heating controlling means for conducting heating water by controlling the water heating means when a hot water temperature detected by the hot water temperature detecting means is below a predetermined temperature when the thermos heat-retention state is selected by the heat insulation selecting means is provided. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric pot capable of keeping a thermos warm.

[0002]

2. Description of the Related Art In recent electric pots, the inner container of the electric pot is constructed with a vacuum double wall structure or other heat insulating structure having high heat insulation performance, and the heat insulation heater is turned off during heat insulation to reduce power consumption to zero. Even in such a case, there is a thermos type in which the temperature of the hot water can be kept as high as possible for as long as possible.

In such a thermos type electric pot, for example, a predetermined heat-retaining temperature according to the intended use, for example, a high-temperature heat-retaining temperature of 98 ° C. for cup noodles, a low-temperature heat-retaining temperature of 90 ° C. for coffee and tea, etc. In addition to the normal warming mode that controls, the two kinds of warming modes, the thermos warming mode that keeps the heat in the thermos state by turning off the warming heater, are provided, for example, when boiling water is finished, "boiler notification" by buzzer After that, the water heater is turned off to shift to the heat retention state, and thereafter, the heat retention mode is changed to a desired heat retention mode selected and set by the user to retain the heat.

[0004]

By the way, in the case of the conventional electric pot, since the above-mentioned thermos heat retention mode is mainly focused on the energy saving effect, the heat retention heater is controlled even if the hot water temperature is lowered. Not to mention that, of course, it does not control the water heater.

Therefore, when the thermos heat retention mode is selected with an emphasis on the energy saving effect, the user may have to use cold water depending on the elapsed level of the heat retention time, which is not always practical. The current situation is that it has not become the preferred heat retention mode.

[0006] Such a decrease in the hot water temperature occurs not only when the heat retaining time elapses as described above but also when the inner container is filled with water. Then, in that case, the hot water temperature is suddenly lowered within a predetermined time.

In view of such circumstances, the present invention provides an electric pot which solves the above problems by detecting a decrease in hot water temperature of a predetermined value or more even in a thermos warming mode and enabling boiling water. It is intended to be provided.

[0008]

In order to achieve the above object, the present invention comprises the following problem solving means, respectively.

(1) Invention of Claim 1 The electric pot of the present invention comprises an inner container having a heat insulating structure capable of boiling water and keeping a thermos, and a boiling water heating means for heating the inner container at the time of boiling water, and an inner container Heat retention temperature setting means for setting the heat retention temperature of the hot water, heat retention heating means for heating the inner container during normal heat retention, and hot water temperature detection for detecting the water temperature in the inner container during normal heat retention and thermos heat retention In an electric pot comprising means and a heat retention selection means for arbitrarily selecting a normal heat retention state and a thermos heat retention state of the inner container, the hot water is supplied when the thermos heat retention state is selected by the heat retention selection means. When the hot water temperature detected by the temperature detecting means becomes equal to or lower than a predetermined temperature, a hot water boiling control means for controlling the hot water heating means to perform hot water heating is provided.

Therefore, in this configuration, even in the thermos heat retention mode in which the thermos heat insulation state is selected by the heat insulation selection means, when the hot water temperature detected by the hot water temperature detection means falls below a predetermined temperature. It becomes possible to automatically perform the boiling by controlling the heating means such as the above-mentioned boiling heater.

Therefore, the user does not have to use cold water even if the thermos is kept warm for a considerably long time.

(2) Invention of Claim 2 An electric pot according to the present invention comprises an inner container having a heat insulating structure capable of boiling water and keeping a thermos, and a boiling water heating means for heating the inner container at the time of boiling water, and inside the inner container. Heat retention temperature setting means for setting the heat retention temperature of the hot water, heat retention heating means for heating the inner container during normal heat retention, and hot water temperature detection for detecting the water temperature in the inner container during normal heat retention and thermos heat retention In an electric pot comprising means and a heat retention selection means for arbitrarily selecting a normal heat retention state and a thermos heat retention state of the inner container, when the thermos heat retention state is selected by the heat retention selection means, the thermos bottle When a predetermined time or more has elapsed after the heat retention state was selected, the boiling water control means is provided for controlling the boiling water heating means to perform boiling.

Therefore, in this configuration, even in the thermos heat retention mode in which the thermos heat retention state is selected by the heat retention selection means, a predetermined time or more has elapsed after the thermos heat retention state has been entered, and the hot water temperature has reached the predetermined level. When it is assumed that the temperature has dropped below the temperature, it is possible to automatically perform the boiling by controlling the boiling means such as the boiling heater and the heating means.

Therefore, the user does not need to use cold water even if the thermos is kept warm for a considerably long time.

(3) Invention of Claim 3 An electric pot according to the present invention comprises an inner container having a heat insulating structure capable of boiling water and keeping a thermos, and a boiling water heating means for heating the inner container when boiling water. Heat retention temperature setting means for setting the heat retention temperature of the hot water, heat retention heating means for heating the inner container during normal heat retention, and hot water temperature detection for detecting the water temperature in the inner container during normal heat retention and thermos heat retention In an electric pot comprising means and a heat retention selection means for arbitrarily selecting a normal heat retention state and a thermos heat retention state of the inner container, the hot water is supplied when the thermos heat retention state is selected by the heat retention selection means. Provided is a boiling water control means for controlling the boiling water heating means by controlling the boiling water when the falling width of the hot water temperature detected by the temperature detecting means per unit time becomes equal to or larger than a predetermined falling width. Is configured.

Therefore, in the configuration, even in the thermos warming mode in which the thermos warming state is selected by the warming selection means, the decrease range of the hot water temperature per unit time detected by the hot water temperature detecting means is small. When it is larger than a predetermined decrease width, that is, when it is assumed that water has been injected into the inner container in the heat retention state, the boiling water such as the boiling water heater is controlled to automatically perform the boiling water. be able to.

Therefore, even if the user pours in water while keeping the thermos warm,
You will not need to use hot water that has a low temperature and has not finished boiling.

(4) Invention of Claim 4 In the electric kettle of the present invention, in the configuration of the invention described in Claims 1, 2 or 3, boiling by the boiling water control means is heating up to a boiling temperature. It has a feature.

The drop in the hot water temperature in the thermos keeping state is not limited to a simple drop in the hot water temperature, but may be a drop in the hot water temperature due to the addition of water.

Therefore, assuming such a case, the heating at the time of boiling water heating is performed until it reaches a boiling state.

(5) Invention of Claim 5 In the electric pot of this invention, in the constitution of the invention of claim 1, the boiling water by the boiling water control means is higher than the predetermined temperature and lower than the boiling temperature. It is characterized by heating up to the set temperature.

When the decrease in the hot water temperature in the heat-retaining state of the thermos is not due to the addition of water, it is not always necessary to heat to the boiling temperature as described above.

Therefore, in such a case, as described above, the boiling water is heated to a predetermined heat retention set temperature which is higher than the heating start temperature but lower than the boiling temperature.

(6) Invention of claim 6 In the electric pot of this invention, in the configuration of the invention of claim 2 described above, the boiling water by the boiling water heating control means is heated to a predetermined heat retention set temperature lower than the boiling temperature. It is characterized by being.

As described above, when the decrease in the hot water temperature in the thermos keeping state is not due to the addition of water, it is not always necessary to heat it to the boiling temperature.

Therefore, in such a case, as described above, it is sufficient to heat to a predetermined heat retention set temperature lower than the arbitrarily selected boiling temperature.

[0027]

As a result of the above, according to the electric pot of the present invention, even when the thermos is kept warm, boiling water can be made as necessary, and the temperature of the hot water once falls below a predetermined value due to the elapsed heat retention time or water injection. Even if the temperature drops, the hot water temperature is raised again to the predetermined temperature or higher after a predetermined time.

Therefore, the usability of the thermos keeping mode is improved as compared with the conventional case, and the original energy saving performance itself is effectively utilized.

[0029]

BEST MODE FOR CARRYING OUT THE INVENTION With reference to the accompanying drawings, first, the configuration and operation of an electric pot main body and a control device common to each of the embodiments described later of an electric pot of the present invention will be described.

(Structure of Main Body of Electric Pot) First, FIGS. 1 to 3 show the structures of the main body and main parts of the electric pot common to the embodiments of the present invention described later.

First, as shown in FIGS. 1 and 2, this electric pot comprises a container body 1 having an inner container 3 for storing hot water,
A lid 2 that opens and closes the upper opening of the container body 1, a boiling water heater 4A that is a heating unit that heats the inner container 3 when boiling the water, and a heating unit that heats the inner container 3 when the temperature is kept warm. Insulating heater 4B, hot water supply passage 5 for supplying hot water in the inner container 3 to the outside, and a flow rate sensor 80 provided in the middle of the hot water supply passage 5 for actual flow rate measurement
An electric hot water supply pump 6 that sends hot water in the inner container 3 to the outside through the hot water supply passage 5 when the AC power supply is connected, and the hot water supply passage 5 when the AC power supply is not connected. And an air type manual hot water supply pump 18 for sending hot water in the inner container 3 to the outside.

The container body 1 has a cylindrical outer case 7 made of synthetic resin that constitutes an outer side surface thereof, the inner container 3 that constitutes an inner side surface part, and the outer case 7 and the inner container 3 on the upper side. It is composed of an annular shoulder member 8 made of synthetic resin, which is integrally connected and fixed, and a dish-shaped bottom member 9 made of synthetic resin, which constitutes the bottom portion.

The above-mentioned inner container 3 is, for example, a vacuum chamber having a high heat insulation performance, in which a vacuum heat insulating space is provided between an inner cylinder 10 having a bottomed cylindrical shape made of stainless steel and an outer cylinder 11 having the same cylindrical shape made of stainless steel. The heat insulating structure has a heavy wall structure, and a single plate portion 3a formed only by the bottom surface portion of the inner cylinder 10 excluding the outer peripheral portion is formed at the bottom portion thereof. The 1
The plate portion 3a is formed so as to project a little higher upward,
On the lower surface side, the water heater 4A and the heat retention heater 4 are provided.
B (for example, a mica plate made of a mica heater that holds two sets of heating elements having different wattages) is attached.

At the upper end of the inner container 3, the inner cylinder 10 is provided.
A small-diameter water supply port 3b having a heat-keeping structure is formed by drawing the upper end portion of the side toward the central axis direction. Reference numeral 12 indicates the temperature of the inner container 3 (in other words, the inner container 3
It is a bottom sensor (hot water temperature sensor) that acts as hot water temperature detecting means for detecting the temperature of the hot water inside, and is composed of a thermistor. Further, reference numeral 13 is the full water level WL _{2 of the} inner container 3
Is a convex full-water level display unit for displaying. Further, WL ₁ indicates a low water level (1/2 water level).

The lid 2 is composed of an upper plate 14 made of synthetic resin and a lower plate 15 made of synthetic resin having an outer peripheral edge joined to the upper plate 14, and is attached to the rear portion of the shoulder member 8. The hinge receiver 16 is supported by a hinge pin 17 so as to be openable and closable in the vertical direction and detachable.

The lid 2 is manually operated so that hot water can be supplied to the outside through the hot water supply passage 5 even when an AC power source is not connected (a magnetic catch type power plug is removed). An air type manual hot water supply pump 18 that is compressed by a pressing operation is provided. The manual hot water supply pump 18 is of a bellows type disposed in a cylindrical portion 19 formed in the substantially central portion of the lid body 2 and has a bellows structure via a pressing cover 20A and a pressing plate 20B. By pressing the bellows 20C downward, the pressurized air 20D in the bellows 20C is blown into the inner container 3 through the air blowing port, and the hot water in the inner container 3 is supplied by the blowing pressure of the pressurized air. It is adapted to be pushed out through the passage 5. Further, 20E is a restoring spring of the bellows 20C upward, and 15A is a bellows supporting plate on the lower plate 15 side. In addition, reference numerals 21a to 21d are vapor discharge passages of the lid body 2 which are communicated with each other from the lower side to the upper side, and 22 is a fall-stop water disposed midway on the vapor discharge portion 21a side of the vapor discharge passages 21a to 21d. It is a valve.

On the lower surface of the lower plate 15 of the lid body 2,
An inner cover member 23 made of metal is fixed, and an outer peripheral edge of the inner cover member 23 is made of a heat-resistant rubber that is pressed against the upper surface of the water supply port 3b of the inner container 3 when the lid 2 is closed. The seal packing 24 is provided.

At the lower position of the inner container 3 on the upstream end side of the hot water supply passage 5, a DC type electric hot water pump 6 is provided via a hot water introducing cylinder 6a on the inner container 3 side and a hot water inlet 6b on the hot water pump side.
In the hot water supply passage 5, the hot water sucked from the hot water inlet 6b through the hot water introduction tube 6a is discharged from the discharge port 6c by the pumping action of the electric hot water supply pump 6. After passing through the straight pipe part 5b of the hot water supply passage 5,
It passes through the flow rate detection passage in the flow rate sensor 80 and is guided from the fall stop water valve side connecting pipe 5c to the hot water pouring outlet 5d to the outside.

Further, reference numeral 35 is an operation panel section having operation surfaces of various switches described later and a display surface of a liquid crystal display section, and 51a is a microcomputer control section 60 and various switches 38 to 41, 42 described below. , 43, a microcomputer board including a liquid crystal display device (driving unit), and the like, 51 denotes a liquid crystal display unit 4
Reference numeral 7 denotes a support member, and 50 is a power supply board including a drive circuit for the electric hot water supply pump 6, a heating control circuit for the hot water heater 4A, the warming heater 4B, a stabilized DC power supply circuit, and the like.

On the operation panel 35, there is a hot water supply switch 38, a hot water supply lock release switch 39, a reboil / heat retention selection switch 40, a good night timer switch 41, and hot water supply amount setting up / down switches 42 and 43 when the fixed hot water supply mode is selected. A reboiling display LED 44, a heat retention operation display LED 45, a hot water supply lock release display LED 46, a liquid crystal display unit 47, and the like are provided. Each switch 3 above
Reference numerals 8, 39, 40, 41, 42, 43 are of operation key type, and the ON and OFF states of the respective switch sections by the operation of the respective operation keys are input to the microcomputer control section 60 which will be described later. It is supposed to be done.

The liquid crystal display section 47 is provided with, for example, a time / time / hot water temperature / operating state and other display section 47a, a heat retention set temperature display section 47b, and a mahobin heat retention display section 47c. Various information is displayed.

This electric hot water supply type electric pot has a continuous hot water supply mode in which the electric hot water supply pump 6 can be continuously driven to discharge hot water as long as the hot water supply switch 38 is pressed.
Even if the hot water supply switch 38 is continuously pressed, the electric hot water supply pump 6 stops when the predetermined amount of hot water preset by the up / down switches 42 and 43 is poured out, and there are two kinds of hot water supply modes. ing.

The flow rate sensor 80 used therefor
For example, the spiral rotary screw blades 82 are loosely fitted to the outer periphery of the rotary support shaft 81 via a cylindrical hub, and they are fitted to the upper end of the straight pipe portion 5b of the hot water supply passage 5 via a fitting cylinder 83. It is configured to be fixed.

(Structure of Control Circuit Unit) FIG. 3 is a block diagram showing the structure of the control circuit unit in the electric pot body having the above structure.

In FIG. 3, reference numeral 57 is, for example, a smoothing capacitor and a power supply IC, and a DC stabilizing power supply unit for supplying a DC power supply to the microcomputer control unit 60, the heating control unit 54, the pump power supply unit 55, etc. A heating control unit for ON / OFF control of the heater 4A and the heat retention heater 4B,
Reference numerals 4A and 4B are heating means composed of the above-described hot water heater 4A and warming heater 4B, 38 to 43 are the above-mentioned hot water supply switch and other switches, and 6 is the above-mentioned DC type electric hot water supply pump.

When the water heater heater 4A outputs a heater ON signal from the microcomputer controller 60 to the heating controller 54, for example, it activates a power relay via a transistor (not shown). Heating is controlled by turning on the power switch.
In the case of the present invention, the microcomputer control unit 60 performs boiling by turning on the power relay when the boiling switch 40 is pressed, even when the temperature control mode of the electric pot is, for example, the thermos temperature control mode. .

After the completion of boiling, the heat retaining heater 4B shifts to a heat retaining state and the microcomputer controller 60
When the warming heater ON signal is output to the heating control unit 54, for example, a transistor (not shown) is turned on to drive the triac to control heating.

The microcomputer control unit 60 further includes various liquid crystal display units 47, reboiling display LEDs 44, heat retention operation display LEDs 45, hot water supply lock release display LEDs 46, various LED display units, hot water supply switch 38, and reboil. / Various operation parts such as the heat retention selection switch 40, the hot water supply lock release switch 39, the sleep timer switch 41, etc. and the various sensor parts such as the bottom sensor (thermistor) 12, the flow rate sensor 80, etc. are connected via input / output ports not shown respectively. Has been done.

In the above electric pot, at the time of boiling water, the above boiling water heater 4A is used to rapidly heat to a boiling state with a high heating output, and then a boiling notification (boiling completion notification) is given by a buzzer sound. Turn on the water heater 4A
The temperature is set to FF, and then the process proceeds to the heat retention step (heat retention state).

Then, in the heat retention step, the above-mentioned heat retention selection switch 40 is used to, for example, the first preset heat retention temperature 98.
There are two types of heat retention modes, a normal heat retention mode that keeps the temperature at two preset temperatures of 90 ° C and 90 ° C, and a thermos keep mode that keeps the heat in the thermos state by turning off the warm heater 4B. , They are arbitrarily selected.

First, in the normal heat retention mode, the heat retention heater 4B is heated and controlled, and the bottom sensor (hot water temperature sensor) 1
The actual hot water temperature T detected by 2 is set by the heat retention temperature setting means centered on the heat retention selection switch 40 and the microcomputer control unit 60 as the first set heat retention temperature 98.
When the temperature reaches the temperature corresponding to the temperature of the liquid crystal display or the second preset heat retention temperature of 90 ° C., the hot water temperature corresponding to the hot water temperature display section of the liquid crystal display unit 47 is displayed. Next, in the thermos warming mode, the above-mentioned warming heater 4B is turned off, and the inner container 3 is kept warm by the adiabatic heat retaining function of the thermos structure.

Further, in the invention of this application, even in the same bottle heat retention mode, as shown in each of the following embodiments, it is possible to boil water as needed, thereby saving energy and convenience in use. It is compatible.

(Embodiment 1) First, FIG. 4 is a flow chart showing the contents of thermos keeping control of an electric pot according to Embodiment 1 of the present invention.

That is, in the control, first, in step S ₁ , the current operating state of the electric pot is that the heater 4A for boiling water is OFF and the LED 45 for displaying the heat retaining operation is lit (heat retaining heater 4B. Only when the ON operation is performed). As a result, when the temperature is not being maintained at the same temperature of NO, this control is ended as it is (normal heat retention execution). On the other hand, when it is being kept YES, then the process proceeds to step S _2, determines whether or not the thermos insulation state in which the thermal insulation selection switch 40 selects the thermos insulation mode.

As a result, when the NO thermostat is not kept warm, this control is finished as it is (normal heat keeping is continued). On the other hand, in the case of thermos insulation state is YES, then the process proceeds to step S _3, after measuring the water temperature T in the inner container 3 by the bottom sensor 12, further proceeds to step S _4, the measurement It is determined whether or not the hot water temperature T is equal to or lower than a predetermined set temperature Ts (for example, a limit temperature Ts = 60 ° C. that can be used as hot water for the time being).

As a result, in the case of NO, this control is finished as it is (keeping the heat of the thermos bottle continued). On the other hand, when the measured temperature T of YES is equal to or lower than the set temperature Ts (T ≦ Ts), the hot water temperature is cooled down by, for example, 60 ° C. by continuing the thermos keeping state for a predetermined time (for example, 2 to 3 hours). the following admitted that in a low water temperature, the process proceeds to step S _5, to oN kettle heater 4A above, by performing the kettle heating control,
For example, heat to a boiling state.

As a result, according to the thermos heat retention control, boiling can be performed as needed even in the thermos heat retention state where no heating control has been conventionally performed.
Even if the hot water temperature drops below the specified value due to the elapsed heat retention time, the hot water temperature rises above the specified temperature again after the specified time, and these are repeated, so the user does not have to use cold hot water. Also gets better.

For this reason, the usability of the thermos keeping mode is improved as compared with the conventional case, and the original energy saving performance itself is effectively utilized.

(Modification) In the above description, in the final boiling step of step S ₅ , the heating control is performed by boiling the water, for example, to the boiling state. It goes without saying that the heating may be controlled to the selectable first and second heat retention set temperatures 98 ° C., 90 ° C., or any other set temperature higher than at least the above 60 ° C. by a predetermined temperature or more. .

On the other hand, in the case where the boiling is stopped at a temperature lower than the boiling temperature, compared to when the boiling temperature is returned to the boiling temperature after the boiling is stopped again, the thermos is kept warm again. , The temperature of the hot water drops quickly.

Therefore, in the same case, it is preferable to return to the heat-retaining state of the thermos only after the boiling at the predetermined temperature is repeated a predetermined number of times.

(Embodiment 2) Next, FIG. 5 is a flow chart showing the contents of the thermos keeping control of an electric pot according to Embodiment 2 of the present invention.

That is, in the control, first, in step S ₁ , the current operating state of the electric pot is that the heater 4A for boiling water is OFF and the LED 45 for displaying the heat retaining operation is lit (heat retaining heater 4B. Only when the ON operation is performed). As a result, when the temperature is not being maintained at the same temperature of NO, this control is ended as it is (normal heat retention control execution). On the other hand, when it is being kept YES, then the process proceeds to step S _2, determines whether or not the thermos insulation state in which the thermal insulation selection switch 40 selects the thermos insulation mode.

Then, as a result, when the heat storage state of the thermos of NO is not established, this control is terminated as it is (normal heat retention control continues). On the other hand, in the case of thermos insulation state is YES, then the process proceeds to step S _3, in a given ambient temperature conditions water temperature T in the inner container 3 is in a predetermined set temperature Ts (for example, T
s is a limit temperature of 60 that can be used as hot water as described above.
The counting operation of the timer t which counts the heat retention elapsed time ts which falls below (° C.) is started. Next, in step S ₄ , it is determined whether or not the count value of the timer t has counted up the time corresponding to the predetermined heat retention elapsed time ts.

As a result, in the case of NO, this control is finished as it is (thermosphere heat retention control is continued). On the other hand, when it is determined that the temperature retention elapsed time ts of YES has elapsed and the temperature of the hot water in the inner container 3 has dropped to the critical temperature 60 ° C. or lower that can be used as the hot water, the process proceeds to step S ₅ . Then, the above-mentioned boiling water heater 4A is turned on, and heating control is performed for boiling water to heat to a boiling state, for example.

As a result, according to the thermostatic control of the thermos, boiling can be performed as necessary even in the thermostatic state where no heating control has been conventionally performed.
Even if the hot water temperature once drops below the predetermined value due to the lapse of the heat retention time, the hot water temperature rises above the predetermined temperature again after the predetermined time.

As a result, the thermos bottle warming mode is easier to use than the conventional one, and the original energy saving performance itself can be effectively utilized.

(Modification) In the above description, in the final boiling step, the heating control is performed by boiling the water, for example, to the boiling state. You may make it heat-control to the 1st, 2nd heat retention set temperature 98 degreeC, 90 degreeC, or other arbitrary set temperature higher than the said 60 degreeC at least by a predetermined temperature or more.

When the boiling water is stopped at a temperature lower than the boiling temperature, the temperature of the boiling water is higher than that when the boiling water is boiled until the boiling temperature is returned after the boiling water is stopped. It drops quickly.

Therefore, in the same case, it is preferable to return to the heat-retaining state of the thermos only after the boiling at the predetermined temperature is repeated a predetermined number of times.

(Embodiment 3) Next, FIG. 6 is a flow chart showing the contents of the thermos keeping control of an electric pot according to Embodiment 3 of the present invention.

That is, in the control, first, in step S ₁ , the current operating state of the electric pot is that the water heater 4A is OFF and the heat retaining operation display LED 45 is lit (heat retaining heater 4B). Only when the ON operation is performed). As a result, when the temperature is not being maintained at the same temperature of NO, this control is ended as it is (normal heat retention control execution). On the other hand, when it is being kept YES, then the process proceeds to step S _2, determines whether or not the thermos insulation state in which the thermal insulation selection switch 40 selects the thermos insulation mode.

Then, as a result, when it is not in the thermos keeping state of NO, the main control is finished as it is (the normal keeping control is continued). On the other hand, in the case where the thermos temperature is YES, the process proceeds to step S ₃ , and the bottom sensor 12 measures the hot water temperature T ₁ in the inner container 3 (referred to as the first hot water temperature), and then, In step S ₄ , the timer operation of the 5-second timer that counts the predetermined elapsed time of 5 seconds is started. Then, in the subsequent step S _5, it is determined that the same time of 5 seconds has elapsed, and if YES, the hot water temperature T ₂ (referred to as the second hot water temperature) in the inner container 3 is measured again in step S ₆ . The second hot water temperature T ₂ and the first hot water temperature T ₂ measured within a predetermined time of 5 seconds
Determining the difference between the water temperature _{T 1 Ts (Ts = T 1} -T 2) is whether a large above a predetermined temperature range 5 ° C., further at step S _7.

As a result, in the case of NO, this control is finished as it is (keeping the thermos kept warm). On the other hand, the above first and YES
When the temperature difference Ts between the second measured hot water temperatures T ₁ and T ₂ in 5 seconds is 5 ° C. or more and the temperature decrease rate is much faster than the temperature decrease rate during normal natural heat dissipation, the thermos bottle is used. for water injection is performed in heat retaining state, recognized that if the hot water temperature decreased significantly, the process proceeds to step S _8, it turns oN the kettle heater 4A above, by performing the kettle heating control, for example, boiling state Heat up to.

As a result, according to the thermos heat retention control, boiling can be performed as necessary even in the thermos heat retention state where no heating control has been conventionally performed.
Even if the hot water temperature suddenly drops below the specified value due to water injection,
After a lapse of a predetermined time, the hot water temperature is raised again to a predetermined temperature or higher.

As a result, the usability of the thermos keeping mode is improved as compared with the conventional case, and the original energy saving performance itself is effectively utilized.

(Embodiment 4) In the above-mentioned thermos keep-warm state, the power plug of the magnet catch structure is generally pulled out and carried in many cases. In such a case, the power plug is connected again. Sometimes a considerable amount of time has passed.

Therefore, in the thermos heat retaining state, even if the power plug is once unplugged and the power plug is reconnected, the thermos bottle warming mode can be maintained as it is, and further, the condition must be met. It is also effective to increase the temperature of the hot water by controlling the boiling water heating as shown in FIGS.

In this case, the boiling may be performed up to the above-mentioned predetermined temperature instead of boiling.

(Other Embodiments) Further, in addition to the above respective embodiments, the embodiment of the present invention is as follows.
The following various embodiments utilizing the gist thereof are adopted.

(1) As described above, in the electric pot of the present invention, the liquid crystal display section 47 is provided on the operation panel section.

Therefore, for example, in the configuration of each of the above-described embodiments, the user is warned by displaying the elapse of the heat retention time or the decrease in the hot water temperature due to pouring water on the hot water temperature display portion and flicking the display. Is also possible.

(2) When the thermos is kept warm, once the power plug is unplugged, the setting of the warm temperature until then is changed, and when the power plug is connected again, the same boiling water as in each of the above-mentioned embodiments is used. Make sure that the newly set insulation temperature is reached.

(3) When the sleep timer is set in the thermos keep-warm state, water is boiled every time a predetermined time elapses until the time set by the timer elapses. .

[Brief description of drawings]

FIG. 1 is a central longitudinal sectional view showing a configuration of an electric pot main body portion common to each embodiment of the present invention, as viewed from the right side.

FIG. 2 is a plan view of the electric pot body portion.

FIG. 3 is a control block circuit diagram of the electric pot main body portion.

FIG. 4 is a flowchart showing the contents of thermos thermal insulation control according to the first embodiment of the present invention.

FIG. 5 is a flowchart showing the contents of thermos thermal insulation control according to Embodiment 2 of the present invention.

FIG. 6 is a flowchart showing the contents of thermos heat retention control according to Embodiment 3 of the present invention.

[Explanation of symbols]

1 is a container body, 2 is a lid, 3 is an inner container, 4A is a heater for boiling water, 4B is a heater for warming water, 5 is a hot water supply passage, 6 is an electric hot water supply pump, 7 is an outer case, 10 an inner cylinder, 11 is an outer cylinder, 12 is a bottom sensor, 18 is a manual hot water pump, 47 is a liquid crystal display,
47b is a heat retention set temperature display unit, 60 is a microcomputer control unit,
80 is a flow sensor.

Claims (6)

[Claims] 1. An inner container having an insulating structure capable of boiling water and keeping a thermos in a thermos, a boiling water heating means for heating the inner container when boiling water, and a warming temperature setting means for setting a warming temperature of hot water in the inner container. , A heat retention heating means for heating the inner container during normal heat retention, a hot water temperature detection means for detecting the hot water temperature in the inner container during normal heat retention and thermos heat retention, a normal heat retention state of the inner container and a thermos heat retention In an electric pot provided with a heat retention selection means for arbitrarily selecting a state, when the thermos heat retention state is selected by the heat retention selection means, the hot water temperature detected by the hot water temperature detection means is equal to or lower than a predetermined temperature. An electric kettle is provided with a boiling water control means for controlling the above-mentioned boiling water heating means to perform boiling. 2. An inner container having an insulating structure capable of boiling water and keeping a thermos in a thermos, a boiling water heating unit for heating the inner container when boiling water, and a warming temperature setting unit for setting a warming temperature of hot water in the inner container. , A heat retention heating means for heating the inner container during normal heat retention, a hot water temperature detection means for detecting the hot water temperature in the inner container during normal heat retention and thermos heat retention, a normal heat retention state of the inner container and a thermos heat retention In an electric pot provided with a heat retention selection means for arbitrarily selecting the state, when the thermos heat retention state is selected by the heat retention selection means, when a predetermined time or more has elapsed after the thermos heat retention state was selected An electric kettle provided with a boiling water control means for controlling the boiling water heating means. 3. An inner container having a heat insulating structure capable of boiling water and keeping a thermos, a boiling water heating means for heating the inner container when boiling water, and a warming temperature setting means for setting a warming temperature of hot water in the inner container. , A heat retention heating means for heating the inner container during normal heat retention, a hot water temperature detection means for detecting the hot water temperature in the inner container during normal heat retention and thermos heat retention, a normal heat retention state of the inner container and a thermos heat retention In an electric pot provided with a heat retention selection means for arbitrarily selecting the state, when the thermos heat retention state is selected by the heat retention selection means, per unit time of the hot water temperature detected by the hot water temperature detection means The electric kettle is provided with a boiling water controller for controlling the boiling water by heating the heating means when the falling width becomes larger than a predetermined falling width. 4. The electric pot according to claim 1, wherein the boiling by the boiling control means is heating up to a boiling temperature. 5. The electric pot according to claim 1, wherein the boiling of water by the boiling water control means is heating up to a predetermined heat retention set temperature higher than the predetermined temperature and lower than the boiling temperature. 6. The electric pot according to claim 2, wherein the boiling of water by the boiling water control means is heating up to a predetermined heat retention set temperature lower than the boiling temperature.