JP2007229068A - Electric pot - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce power consumption during heat retention as much as possible. <P>SOLUTION: The electric pot comprises a container capable of boiling water and retaining the heat of the boiled water, a heating means for heating the hot water inside the container, and a heat-retention/heating control means for retaining the heat of the hot water in the container at prescribed temperature by turning on/off a power supply to the heating means. The electric pot also has a storage capacitor with a prescribed capacity to charge the electricity when the power supply to the heating means is on or to discharge the electricity when the power supply is off in retaining the heat, so that the capacitor functions as a control power supply. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electric pot having a heat retaining function.

  Recently, many electric kettles with improved heat insulation performance and improved heat insulation performance and energy saving performance have been provided by adopting a vacuum double wall structure or a heat insulating material interposition structure for the inner container for hot water. (See Patent Document 1).

  In the case of such an electric pot, for example, there are two heat retention modes: a “normal heat retention mode” and a “magic bottle heat retention mode”. In normal heat insulation mode, the heat insulation heater is not turned off completely, but it is turned on for 1 minute and then turned on for 5 minutes. By increasing the OFF time, heat retention is performed at a desired set temperature while saving energy. On the other hand, in the magic bottle warming mode, the warming heater is basically turned off to obtain the maximum energy saving effect.

  As described above, in conventional electric pots, the heat-saving heater is turned off for as long as possible in both the normal heat insulation state and the heat insulation state of the bottle, so that the energy saving effect at the time of heat insulation is improved. ing.

Japanese Patent Laid-Open No. 2002-153381 (Specifications, pages 1 to 11, FIGS. 1 to 4)

  However, in the above-described conventional electric pot, operation power is supplied to at least each part of the power supply board (power supply circuit) and the corresponding electric power is consumed even while the heat insulation heater is turned off as described above. (For example, about 0.3 to 0.5 W).

  Therefore, it is also necessary to reduce the standby power of the power supply circuit board. If possible, when the heat retaining heater is turned off, the power supply circuit board itself should be turned off.

  However, if it does so, the problem that the operation power supply of control parts, such as a microcomputer, will lose | disappear will arise.

  The present invention has been made based on such a situation. When the power is turned off by the heating means during the heat retention control, the power to the power circuit board can be turned off, and a storage capacitor having a predetermined capacity is provided. The purpose of the present invention is to provide an electric pot with high energy-saving performance that charges the same storage capacitor when the power is turned on and allows the discharge voltage of the storage capacitor to be used as the control power supply for the control unit when the power is turned off. It is.

  In order to achieve the above object, each invention of the present application includes the following problem solving means.

(1) Invention of Claim 1 The problem-solving means of the present invention controls the ON / OFF of the inner container capable of boiling and keeping warm, the heating means for heating the hot water in the inner container, and the power supply to the heating means. Thus, an electric pot comprising a heating and heating control means for keeping the hot water in the inner container at a predetermined temperature, and is charged when the power to the heating means is turned on and the power is turned off when the power is turned off. A storage capacitor having a predetermined capacity that discharges and functions as a control power supply is provided.

  According to such a configuration, the voltage at the time of discharging the storage capacitor functions as the operation power supply of the control unit, so that the power supply to the power supply circuit board described above can be turned off during the discharge period. Thus, the energy-saving performance during heat insulation can be further improved.

(2) Invention of Claim 2 The problem-solving means of the present invention controls the ON / OFF of the inner container capable of boiling and keeping warm, the heating means for heating the hot water in the inner container, and the power supply for the heating means. An electric pot comprising a heat-retaining and heating control means for keeping the hot water in the inner container at a predetermined temperature, and at the time of heat-retaining, a predetermined charging time determined by its capacity and charging voltage, and its capacity and load The charging / discharging operation is performed with a predetermined discharge time determined by the power consumption on the side as one cycle, and a storage capacitor that functions as a control power source at the time of discharge is provided.

  According to such a configuration, even when there is no power-on period for the heating means, for example, when the bottle is kept warm, the voltage at the time of discharging the storage capacitor functions as the operation power supply of the control unit. During the discharge period, the power supply to the power circuit board described above can also be turned off, so that the energy saving performance can be further improved, such as when the bottle is kept warm.

(3) Invention of Claim 3 The problem-solving means of the present invention includes an inner container capable of boiling water and maintaining a bottle temperature, a heating means for heating the hot water in the inner container, and turning on the power to the heating means, An electric pot provided with a heat-retaining and heating control means for keeping the hot water in the inner container at a predetermined temperature by performing OFF control, wherein the standby power during the heat insulation of the bottle is more than the standby power during the normal heat retention Is also characterized by a smaller size.

  As described above, when the standby power at the time of holding the bottle is smaller than the standby power at the time of holding the bottle, the energy saving performance at the time of holding the bottle can be further improved.

  As a result of the above, according to the electric pot of the present invention, the energy-saving performance at the time of each heat retention such as the normal heat retention and the heat retention of the bottle can be improved as much as possible.

  Hereinafter, the configuration and operation of an electric pot according to the best embodiment of the present invention will be described with reference to the accompanying drawings.

(Configuration of the electric pot body)
First, FIGS. 1 to 3 show the configuration of the main body and the main part of the electric pot according to the best mode of the present invention.

  As shown in FIGS. 1 and 2, the electric pot includes a container body 1 having an inner container 3 for storing hot water, a lid body 2 that opens and closes an upper opening of the container body 1, and the inner container 3. Water heater 4A, which is a heating means for heating when boiling water, a heat retaining heater 4B, which is a heating means for heating the inner container 3, and a hot water supply passage for supplying hot water in the inner container 3 to the outside 5 and the flow rate sensor 80 for measuring the hot water flow rate provided in the middle of the hot water supply passage 5 and the hot water in the inner container 3 are sent out through the hot water supply passage 5 in a state where an AC power source is connected. The electric hot water supply pump 6 and an air-type manual hot water supply pump 18 that sends hot water in the inner container 3 to the outside through the hot water supply passage 5 in a state where an AC power source is not connected are configured.

  The said container main body 1 couple | bonds integrally the cylindrical outer case 7 made from a synthetic resin which comprises an outer side surface part, the said inner container 3 which comprises an inner side part, and the said outer case 7 and the inner container 3 on the upper side. It consists of an annular shoulder member 8 made of synthetic resin to be fixed and a dish-shaped bottom member 9 made of synthetic resin that constitutes the bottom surface portion.

  The inner container 3 is composed of a vacuum double structure with high heat retention performance in which a vacuum heat insulating space is provided between a stainless steel bottomed cylindrical inner cylinder 10 and a stainless steel cylindrical outer cylinder 11. In addition, a single plate portion 3a composed only of the bottom surface portion of the inner cylinder 10 except for the outer peripheral portion is formed at the bottom portion. The single plate portion 3a is formed so as to protrude slightly upward. On the lower surface side, the water heater 4A and the heat retaining heater 4B (for example, two sets of heating elements having different wattages are held on the mica plate). A mica heater is attached.

  A small-diameter water supply port 3b having a heat keeping structure is formed at the upper end portion of the inner container 3 by drawing the upper end portion on the inner cylinder 10 side toward the central axis direction. Reference numeral 12 denotes a bottom sensor (hot water temperature sensor) that functions as a hot water temperature detecting means for detecting the temperature of the inner container 3 (in other words, the temperature of hot water in the inner container 3), and includes a thermistor. . Further, reference numeral 13 denotes a convex full water level display portion that displays the full water level of the inner container 3.

  The lid 2 includes a synthetic resin upper plate 14 and a synthetic resin lower plate 15 having an outer peripheral edge coupled to the upper plate 14, and is provided at the rear portion of the shoulder member 8. The hinge receiver 16 is supported by a hinge pin 17 so that it can be opened and closed in a vertical direction and is detachable.

  The lid 2 is provided with an air-type manual hot water supply pump 18 that is compressed by a manual pressing operation 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. It is installed. The manual hot water supply pump 18 is of a bellows type disposed in a cylindrical portion 19 formed at a substantially central portion of the lid 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 with hot water by the pressure of the pressurized air. It is pushed out through the passage 5. Further, 20E is a restoring spring upward of the bellows 20C, and 15A is a bellows support plate on the lower plate 15 side. Reference numerals 21a to 21d are steam discharge passages of the lid body 2 that are in communication with each other from the lower side to the upper side. It is a valve.

  A metal inner cover member 23 is fixed to the lower surface of the lower plate 15 in the lid 2, and the inner container 3 is attached to the outer peripheral edge of the inner cover member 23 when the lid 2 is closed. A heat-resistant rubber seal packing 24 is provided in pressure contact with the upper surface of the water supply port 3b.

  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 disposed through an inner container 3 side hot water introduction cylinder 6a and a hot water supply pump side hot water inlet 6b. In this hot water supply passage 5, hot water sucked from the hot water inlet 6 b through the hot water inlet cylinder 6 a is discharged from the discharge port 6 c by the pumping action of the electric hot water supply pump 6, After passing through the straight pipe portion 5b, it passes through the flow rate detection passage in the flow rate sensor 80 and is led to the hot water pouring outlet 5d from the overturn stop water valve side connecting pipe 5c.

  Further, reference numeral 35 denotes an operation panel unit provided with operation surfaces of various switches described later and a display unit of a liquid crystal display device, and 51a represents a microcomputer control unit 60 described later and various switches 38 to 41, 42, 43a, 43b. , A microcomputer substrate having a drive unit of the liquid crystal display device, 51 is a support member of the liquid crystal display unit 47, 50 is a drive circuit of the electric hot water supply pump 6, a heating heater 4A, a heating control circuit of the heat retaining heater 4B, a stable A power supply board provided with an integrated DC power supply circuit and the like.

  The operation panel 35 includes a hot water supply switch 38, a hot water supply unlocking switch 39, a re-boiling switch 40, a heat retention selection switch 43a, 43b, an energy saving course selection / timer switch 41, a metering cup switch 42 for selecting a predetermined hot water supply mode, A boiling display LED 44, a heat retaining operation display LED 45, a hot water supply lock release display LED 46, a liquid crystal display unit 47 (liquid display surface 47a), and the like are provided.

  In the case of this embodiment, the heat retention selection switches 43a and 43b also serve as an up setting switch and a down setting switch for the set heat retention temperature.

  The liquid crystal display unit 47 is provided with a display surface 47a such as time / time / hot water temperature setting / maeline heat insulation, etc., so that various necessary information can be displayed with low power consumption. ing.

  This electric hot water supply type electric kettle continuously drives the electric hot water supply pump 6 and pours hot water as long as the hot water supply switch 38 is kept pressed on condition that the unlock switch 39 is turned on. If the predetermined amount of hot water set in advance by the measuring cup switch is poured even if the lock release switch 39 is turned on and the hot water switch 38 is kept pressed, the electric hot water pump can be used. Two hot water supply modes including a fixed hot water supply mode in which 6 is stopped and hot water supply is locked are provided.

  The flow rate sensor 80 used for controlling the electric hot water supply pump 6 comprises, for example, as shown in FIG. 3, a spiral rotary screw blade 82 provided on the outer periphery of a rotary support shaft 81, A tube made of a transparent body is provided on the outer periphery of the hot water supply passage 5 while being fitted and fixed in the middle of the straight pipe portion 5b of the hot water supply passage 5 through a fitting tube 83, and the outer peripheral portion of the hot water passage 5 is liquid-tightly covered with a silicon elastic body 89. The lower end portion 84a of the channel-shaped passage forming member 84 is fitted. Further, the upper end portion 84b of the passage forming member 84 is butted against the lower end of the fall stop water valve side connecting pipe 5c, and a sleeve 88 is fitted to the outer periphery of the butting portion to be connected and fixed in a sealed state.

  Further, an apparatus support flange 84c is provided on the outer periphery on the lower side of the passage forming member 84, and a double wall of a first cylindrical wall 85a having a small diameter and a second cylindrical wall 85b having a large diameter is provided on the upper portion thereof. An umbrella-shaped device cover 85 having a cylindrical wall structure is fitted and fixed. A device substrate 86 is attached using the first cylindrical wall 85a, and a light emitting portion 87a and a light receiving portion are disposed at both front and rear positions facing each other across the transparent passage forming member 84 on the device substrate 86. 87b are installed with their optical axes aligned with each other. The optical axes of the light emitting portion 87a and the light receiving portion 87b have a radius greater than the rotational center axis position so that the optical axis is located through the gap between the upper and lower blades of the spiral rotating screw blade 82 in the passage forming member 84. It is installed at a predetermined position outward in the direction.

  Therefore, when the electric hot water supply pump 6 is driven and hot water passes through the hot water flow passage in the passage forming member 84 from the lower side to the upper side through the straight pipe portion 5b, the helical rotary screw blade 82 is thereby moved. However, the optical axis between the light emitting part 87a and the light receiving part 87b is interrupted every half rotation, and the light receiving part 87b outputs a predetermined number N of output signals corresponding to the rotation speed within the unit time. Is output. The number N of output signals eventually represents the amount of hot water supplied by the electric hot water supply pump 6.

  In the case of the present embodiment, the output signal (flow rate detection signal) of the flow rate sensor 80 configured in this way is in a state where it can always operate as in the prior art, and the output is always in the microcomputer control unit 60. As described later, the lock release switch 39 is turned on by the user, or the lock release switch 39 is turned on, and the hot water supply switch 38 is turned on. It can be read into the microcomputer controller 60 only while hot water is being supplied.

  Thereby, for example, the standby power consumption during the heat insulation waiting time of the bottle can be reduced from 0.7 W to 0.3 W.

(Configuration of control circuit)
Next, FIG. 4 is an electric circuit diagram showing the configuration of the control circuit section in the electric pot body having the above configuration.

  In FIG. 4, reference numeral 52 is an AC power source, 4A is a hot water heater, 4B is a heat retaining heater, 60 is a microcomputer control unit, 63 is a zero cross detection circuit for power supply voltage, 64 is a smoothing capacitor, 6 is an electric hot water supply pump (and pump drive). ), RS is a power switch (relay switch) for operating the water heater 4A, RL is a power relay for driving the power switch RS (relay drive circuit such as a relay coil), 53 is a triac for operating the heat retaining heater 4B, 57 is A transistor for driving the triac 53, 61 is a hot water prevention circuit of the electric hot water supply pump 6, and 62 is a hot water supply notification circuit for notifying the hot water supply condition on condition that the hot water supply switch 38 is turned on.

  Reference numeral 65 denotes a chargeable large-capacity electric double layer capacitor that is used as a DC constant voltage power source for operation of a microcomputer or the like instead of the power source from the constant voltage power source during the heat insulation of the magic bottle. Along with the switch circuit 66, the power supply relay RL is connected in parallel (in the figure, one is provided, but two can be provided in parallel).

  Reference numeral 67 denotes a discharge voltage detection circuit which detects that the voltage of the electric double layer capacitor 65 has become equal to or lower than a specified value and inputs the detected voltage to the microcomputer control unit 60.

  For example, when the hot water heater ON signal is output from the microcomputer control unit 60, the hot water heater 4A is driven by first operating the power relay RL and correspondingly turning on the power switch RS.

  Further, when the warming heater ON signal is output from the microcomputer control unit 60, the warming heater 4B is driven by turning on the transistor 57 and triggering the triac 53.

  Furthermore, when the hot water supply switch 38 inserted in the ground side line of the electric hot water supply pump 6 is turned on, an ON signal of the hot water supply switch 38 is sent to the microcomputer control unit 60 via the hot water supply notification circuit 62. In response to this, the microcomputer control unit 60 turns off the heat retaining heater 4B, and a pulse voltage signal having a predetermined duty ratio is output from the microcomputer control unit 60, and is appropriately rotated at a predetermined duty ratio. The

  The microcomputer controller 60 is supplied with a predetermined constant voltage (not shown) via a constant voltage power source (original operating power source) (not shown).

  Further, the microcomputer control unit 60 further includes various display units such as a liquid crystal display unit 47, a reboil display LED 44, a heat insulation operation display LED 45, a hot water supply unlock display LED 46, a hot water switch 38, a reboil switch 40, a hot water supply Various operation units (switch circuits) such as the lock release switch 39, energy saving course selection / timer switch 41, measuring cup switch 42, heat retention selection switches 43a and 43b, and various sensor units (sensor circuit such as the temperature detection means 12 and the flow rate sensor 80) ), A first clock frequency oscillator (4 MHz) 58 for operating the microcomputer during normal operation, a second clock frequency oscillator (32.768 KHz) 59 for operating the microcomputer during thermal insulation (when saving energy), etc. Connected via I / O port.

  In the above circuit, the electric double layer capacitor 65 is charged using the original chopper power supply circuit when the heat retaining heater 4B is turned on during the boiling operation and the heat retaining operation, and the chopper is turned off when the heat retaining heater 4B is turned off. The power supply circuit is stopped by microcomputer control, and the microcomputer and the display unit are operated by the discharge charge of the electric double layer capacitor 65, thereby saving as much standby power as possible when the balance is kept warm. I have to. As an example, the electric double layer capacitor 65 has a withstand voltage of 5.5V (MAX), and in order to increase the withstand voltage, series connection may be performed. MAX)).

  In this case, the charge control of the electric double layer capacitor 65 requires, for example, about 2 minutes for 2F (Farad), and can be operated as a microcomputer operating power source for about 15 minutes after charging for 2 minutes. If there is, 2 minutes + 15 minutes = total 17 minutes as one cycle, the chopper power supply circuit is alive only for 2 minutes, charging is performed during that time, and the balance is kept warm for 15 minutes after that with the original operation power off. can do.

  Therefore, a considerable power consumption reduction effect can be realized as a total.

  Further, in the above circuit, in the normal case where the balance is not kept warm, the first clock frequency oscillator 58 is used to operate at the first clock frequency of 4 MHz. The second clock frequency oscillator 59 is switched from the clock frequency of 4 MHz to the second clock frequency of 32.768 KHz, thereby reducing the power consumption of the microcomputer as much as possible.

  On the other hand, when the electric double layer capacitor 65 is provided as described above, due to its capacitance characteristics, there is a problem that the rise time of the power supply becomes long when the power is turned on and the reaction of the user to the switch operation becomes slow. Therefore, in the above circuit, when such a power supply is started up, the power supply is quickly started up with a small electrostatic capacity of a normal electrolytic capacitor 68 provided in parallel, and then the operation is stabilized, and then the electric double layer capacitor is connected. 65 is charged.

  Further, in the above circuit, a discharge voltage detection circuit 67 is provided so that the electric charge of the electric double layer capacitor 65 is reduced to a predetermined level or less, thereby preventing the microcomputer from being reset. When the double layer capacitor 65 is discharged to a predetermined voltage or lower, the charge switch circuit 66 is automatically operated to start charging up to 5.5V.

  Thus, in the above circuit, when the discharge potential of the electric double layer capacitor 65 is lowered to a predetermined reference value by the discharge voltage detection circuit 67, it is automatically charged. When the double layer capacitor 65 has been discharged before the next charge, the following measures can be taken.

  (1) When the reset works and the hot water temperature is high, normal heat insulation is executed.

  (2) When the hot water temperature is low, normal boiling is performed.

  In this way, even in the event of a discharge before charging, the normal process can be performed.

  Furthermore, conventionally, when the hot water supply switch 38 is operated without operating the lock release switch 39 and a drive voltage is applied to the electric hot water supply pump 6, the warm water heater 4 </ b> B is forced to drive the electric hot water supply pump 6. Although no voltage is applied, as described above, in this embodiment, the clock frequency of the microcomputer is from the first clock frequency of 4 MHz (normal mode) at the normal time to the second clock frequency at the time of holding the balance. The mode can be switched to 32.768 KHz (low power consumption mode). Therefore, when the switching is performed, a time delay occurs from the time when the hot water supply switch 38 is turned on to the time when the heat retaining heater 4B is forcibly driven.

  Therefore, as a countermeasure, in the above circuit, the hot water protection circuit 61 is provided in hardware as described above, and when the ON signal of the lock release switch 39 is input by the hardware, the hot water protection circuit 61 is thereafter operated by the microcomputer. The hot water protection function 61 is canceled.

(Heat insulation control when energy saving course is selected)
Next, FIG. 5 shows an example of a control pattern of heat retention control when selecting an energy saving course of the electric pot according to the preferred embodiment of the present invention configured as described above.

  In this energy-saving and warming control, for example, as shown in the time chart of FIG. 5, the electric pot (microcomputer control unit 60) automatically adjusts according to the time zone where hot water is required in each home within 24 hours a day. The above-described heat insulation function of the hot water heater 4A and the heat insulation heater 4B is switched between the ON state and the OFF state so that the total power consumption during the wake-up from 6:00 to 23:00 and during sleep is minimized. Efficient heating and heat insulation control utilizing the above is realized.

(Energy saving control when reading flow sensor output)
In an electric pot having a flow rate detecting function so far, as long as the power plug (AC power source 52 in FIG. 4) is connected to the power circuit of the electric pot body as described above, the lock release switch 39 and the hot water supply switch 38 are connected. Regardless of the ON or OFF state, the operation power is supplied to the flow rate sensor 80 via the chopper circuit, and the output signal can be read into the microcomputer of the microcomputer control unit 60. That is, the flow rate sensor 80 is controlled so as to be able to detect the hot water supply flow rate at all times.

  However, in spite of the fact that hot water is not actually supplied, it is useless to activate the flow rate sensor 80 so that the lock release switch 39 is originally turned ON so that hot water is actually supplied. It should be sufficient to apply the operating power at this stage.

  The hot water supply amount control in the flowchart of FIG. 6 is configured from such a viewpoint.

In this configuration, first, an ON signal of the above-described lock release switch 39 is input to the above-described microcomputer control unit 60 (step S ₁ ), and based on this, it is determined whether or not the lock release switch 39 is actually turned on. (step S _2).

As a result, when the hot water supply start state in which the lock release switch 39 is actually turned on is YES, it is possible to detect the hot water flow rate by applying an operating voltage to the flow rate sensor 80 for the first time at that time. At the same time, an output signal of the flow rate sensor 80 can be read into the microcomputer control unit 60 (step S ₃ ).

Thereafter, when the hot water supply switch 38 is turned ON, the respective parts such as the drive circuit of the electric hot water supply pump 6 are operated to perform hot water supply within a predetermined hot water supply time set in advance (step S ₄ ).

Thereafter, a predetermined amount of hot water is supplied, the predetermined time set in advance has elapsed, the hot water switch 38 is automatically released from the ON state, and the lock release switch 39 is automatically turned OFF. Then, it is determined again whether or not the original automatic hot water supply is locked (step S ₅ ).

  As a result, if it is determined as YES, it is recognized that the hot water supply is finished, the application of the operating voltage to the flow sensor 80 is stopped, and the output signal reading operation of the flow sensor 80 into the microcomputer control unit 60 is also stopped. As much as possible, the power consumption during the warming standby is reduced.

(Modification of energy-saving control when reading flow sensor output)
By the way, in the case of the hot water supply amount control of FIG. 6 described above, even if the lock release switch 39 is originally turned on and the locked state is released, the hot water supply is not always performed immediately. Therefore, it is reasonable to apply the operation power to the flow rate sensor 80 when the hot water supply switch 38 is actually pushed.

  The flowchart of FIG. 7 is configured from such a viewpoint.

In this configuration, first, an ON signal of the above-described lock release switch 39 is input into the microcomputer control unit 60 (step S ₁ ), and based on this, it is determined whether or not the lock release switch 39 is actually turned ON (step S ₁ ). step S _2).

As a result, when the lock release switch 39 is actually turned on (YES), an ON signal of the hot water supply switch 38 is further input (step S ₃ ), and the hot water supply switch 38 is turned on. It is determined whether or not (step S ₄ ). And when the result is also in the hot water supply start state of YES, it is possible to detect the hot water supply flow rate by applying an operating voltage to the flow rate sensor 80 for the first time at that time, and to the microcomputer control unit 60 with the same flow rate sensor 80. Is read (step S ₅ ).

Thereafter, correspondingly, the respective parts such as the drive circuit of the electric hot water supply pump 6 are operated to perform hot water supply within a predetermined hot water supply time set in advance (step S ₆ ).

Thereafter, a predetermined amount of hot water supply set in advance is performed, and the ON state of the hot water supply switch 38 is automatically released after the predetermined time set in advance has elapsed, and the unlocking is performed. It is determined whether or not the switch 39 is automatically turned off and is automatically locked again to the original hot water supply disabled state (step S ₇ ).

As a result, if it is determined as YES, it is recognized that the hot water supply is finished, the application of the operating voltage to the flow sensor 80 is stopped, and the output signal reading operation of the flow sensor 80 into the microcomputer control unit 60 is also stopped (step) S ₈ ) to reduce power consumption during the warming standby as much as possible.

(Display control when holding a magic bottle)
As described above, in the electric pot according to the present embodiment, the power consumption and standby power during “magic bottle warming” are reduced from various viewpoints. When the “magic bottle heat display” is displayed by the heat display LED 45, the power consumption is large.

  Therefore, for example, as shown in FIG. 8, the temperature is changed to the LCD display B (magic bottle) together with the set temperature display A (90 ° C.) to save power consumption as much as possible.

It is the longitudinal cross-sectional view seen from the side which shows the structure of the electric pot main-body part of embodiment of this invention. It is a top view of the electric pot main-body part. It is an expanded longitudinal cross-sectional view of the flow sensor part of the electric pot main-body part. It is a control circuit diagram of the electric pot main body part. It is a figure which shows the basic heat retention pattern of the same electric pot. It is a flowchart of the flow sensor output signal reading control routine of the same electric pot. It is a flowchart of the partial modification of the flow sensor output signal reading control routine of the same electric pot. It is a figure which shows an example of the energy-saving display at the time of the thermal insulation of the same electric pot.

Explanation of symbols

  1 is a container body, 2 is a lid, 3 is an inner container, 4A is a hot water heater, 4B is a warming heater, 5 is a hot water supply passage, 6 is an electric hot water supply pump, 7 is an outer case, 10 is an inner cylinder, 11 is an outer cylinder , 12 is a bottom sensor, 18 is a manual hot water pump, 60 is a microcomputer controller, 65 is an electric double layer capacitor, 66 is a charge switch circuit, 67 is a discharge voltage detection circuit, and 80 is a flow sensor.

Claims (3)

  An inner container capable of boiling and keeping warm, a heating means for heating the hot water in the inner container, and a power source for the heating means are turned on and off to keep the hot water in the inner container at a predetermined temperature. An electric pot comprising a heat-retention heating control means, and a power storage capacitor having a predetermined capacity that functions as a control power supply that is charged when the power supply to the heating means during heat insulation is turned on and discharged when the power supply is turned off. An electric kettle characterized by being provided.   An inner container capable of boiling and keeping warm, a heating means for heating the hot water in the inner container, and a power source for the heating means are turned on and off to keep the hot water in the inner container at a predetermined temperature. An electric pot provided with a heat-retaining and heating control means, and at the time of heat-retaining, a predetermined charging time determined by its capacity and charging voltage and a predetermined discharging time determined by its capacity and power consumption on the load side are charged and discharged as one cycle. An electric pot provided with a storage capacitor that operates and functions as a control power source during discharging.   An inner container capable of boiling water and holding a bottle, heating means for heating the hot water in the inner container, and ON / OFF control of the power supply to the heating means, thereby controlling the hot water in the inner container at a predetermined temperature. An electric pot comprising a heat-retaining and heating control means for keeping warm, wherein the standby power during the heat insulation of the bottle is smaller than the standby power during the normal heat-retention.

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