JP3736456B2 - Electric pot - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
[0002]
  The present invention relates to an electric pot capable of keeping a thermos warm.
[Prior art]
[0003]
  In recent electric pots, even if the inner container of the electric pot is composed of a vacuum double wall structure or other heat insulating structure with high heat retention performance, and the heat retention heater is turned off during heat retention, the power consumption is zero, There is a thermos type that can maintain the temperature of hot water at a high temperature for as long as possible.
[0004]
  In such a thermos-type electric pot, for example, a heat-retaining heater is controlled at a predetermined heat-retaining set temperature according to the application, for example, a high-temperature heat-retaining temperature for cup noodles, etc. In addition to the normal heat retention mode, there are two types of heat retention modes: thermos heat insulation mode that keeps the heat insulation heater OFF and heats in the thermos state. The heater is turned off to shift to the warming state, and thereafter, the desired warming mode selected and set by the user in the warming mode is shifted to keep warm.
[Problems to be solved by the invention]
[0005]
  By the way, in the case of the conventional electric pot, since the thermos warming mode is mainly focused on the energy saving effect, even if the hot water temperature is lowered, of course, the warming heater is not controlled. The water heater is not controlled.
[0006]
  Therefore, when the thermos warming mode is selected with emphasis on the energy saving effect, depending on the elapsed time of the warming time, the user may be forced to use cold water, which is not necessarily preferred in practice. The current situation is that it cannot be a mode.
[0007]
  Such a decrease in hot water temperature occurs not only when the heat retention time has elapsed as described above, but also when water is added to the inner container. In that case, the hot water temperature is suddenly lowered within a predetermined time.
[0008]
  In view of such circumstances, the present invention provides an electric pot that can detect a decrease in hot water temperature of a predetermined value or more even in a thermos warming mode and can perform hot water boiling, and solves the above-described problems. It is intended.
[Means for Solving the Problems]
[0009]
  In order to achieve the above object, the present invention includes the following problem solving means.
[0010]
  (1) Invention of Claim 1
  An electric pot according to the present invention includes an inner container having a heat insulating structure capable of boiling water and holding a thermos bottle, a boiling water heating means for heating the inner container at the time of boiling water, and a warming temperature setting for setting a warming temperature of the hot water in the inner container. Means, warming and heating means for heating the inner container during normal warming, hot water temperature detecting means for detecting hot water temperature in the inner container during normal warming and thermos warming, and the normal warming state of the inner container; In an electric pot comprising a heat retention selection means for arbitrarily selecting a thermos warming state, when the thermos warming state is selected by the heat retention selection means, apart from boiling water by turning on the reboiling switch, When the hot water temperature detected by the hot water temperature detecting means falls below a predetermined temperature lower than the set temperature, the hot water heating means is controlled to boil or set warming temperature. While performing the kettle until, when the set warm temperature at that time is lower than the boiling temperature, sameSetting heat retentionWater heater to temperatureReturn to the thermos warm state after repeating the specified number of timesA water heater control means is provided.
[0011]
  Therefore, in this configuration, even in the thermos warming mode in which the thermos warming state is selected by the warming selection means, when the hot water temperature detected by the hot water temperature detecting means falls below a predetermined temperature, the hot water heater The hot water heating is automatically performed by controlling the equal hot water heating means, and the hot water temperature can be raised to the boiling state or the set warm temperature set by the warm temperature setting means.
[0012]
  Therefore, the user does not have to use the cold water even when the thermos is kept warm for a considerably long time.
[0013]
  In addition, in the same hot water boiling process, for example, when a heat insulation temperature lower than the boiling temperature is set by the heat insulation temperature setting means, the detection value of the hot water temperature detection means is the same.Set heat retention lower than boiling temperatureIf you stop water heating immediately when the temperature is reached,Because there is no convection and the temperature of the whole hot water does not rise uniformly,After returning to the thermos warming state again after stopping the boiling, the water was boiled to the boiling temperature.There is effective convectionIn comparison with time, there is a problem that the temperature of the hot water decreases too quickly.
[0014]
  Therefore, in such a case, the sameSetting lower than boiling temperatureOnly after repeated heating to the heat-retaining temperature a predetermined number of timesSetting lower than boiling temperatureReturn to the thermos warming state at the warming temperature.
[0015]
  In this way,Predetermined number of timesDue to the effective convection in the inner container caused by repeated boiling of the water in the inner container, sufficient heat is passed through the entire inner container, and the distribution of the hot water becomes uniform, suppressing the decrease in the hot water temperature as much as possible. Is done.
[0016]
  (2) Invention of Claim 2
  An electric pot according to the present invention includes an inner container having a heat insulating structure capable of boiling water and holding a thermos bottle, a boiling water heating means for heating the inner container at the time of boiling water, and a warming temperature setting for setting a warming temperature of the hot water in the inner container. Means, warming and heating means for heating the inner container during normal warming, hot water temperature detecting means for detecting hot water temperature in the inner container during normal warming and thermos warming, and the normal warming state of the inner container; In an electric pot comprising a heat retention selection means for arbitrarily selecting a thermos warming state, when the thermos warming state is selected by the heat retention selection means, apart from boiling water by turning on the reboiling switch, When a predetermined time or more has elapsed after the thermos warming state has been selected, the hot water heating means is controlled to perform boiling until the boiling state or the set warming temperature is reached. On the other hand, when the setting warm temperature at that time is lower than the boiling temperature, the kettle to the same set warm temperatureReturn to the thermos warm state after repeating the specified number of timesA water heater control means is provided.
[0017]
  Therefore, in this configuration, even in the thermos warming mode in which the thermos warming state is selected by the warming selection means, a predetermined time or more elapses after the transition to the thermos warming state, and the hot water temperature falls below the predetermined temperature. When it is assumed that the hot water heater is automatically controlled by controlling the hot water heating means such as the hot water heater, the hot water temperature can be raised to the boiling state or the set warming temperature set by the warming temperature setting means. It becomes like this.
[0018]
  Therefore, the user does not have to use the cold water even when the thermos is kept warm for a considerably long time.
[0019]
  In addition, in the same hot water boiling process, for example, when a heat insulation temperature lower than the boiling temperature is set by the heat insulation temperature setting means, the detection value of the hot water temperature detection means is the same.Set heat retention lower than boiling temperatureIf you stop water heating immediately when the temperature is reached,Because there is no convection and the temperature of the whole hot water does not rise uniformly,After returning to the thermos warming state again after stopping the boiling, the water was boiled to the boiling temperature.There is effective convectionIn comparison with time, there is a problem that the temperature of the hot water decreases too quickly.
[0020]
  Therefore, in such a case, the sameSetting lower than boiling temperatureOnly after repeated heating to the heat-retaining temperature a predetermined number of timesSetting lower than boiling temperatureReturn to the thermos warming state at the warming temperature.
[0021]
  In this way,Predetermined number of timesDue to the effective convection in the inner container caused by repeated boiling of the water in the inner container, sufficient heat is passed through the entire hot water in the inner container, and the hot water temperature distribution becomes uniform, reducing the hot water temperature as much as possible. It is suppressed.
【The invention's effect】
[0022]
  As a result of the above, according to the electric pot of the present invention, even in the thermos warming state, boiling water is made as necessary, even if the hot water temperature once falls below a predetermined value due to the passage of warming time or water injection, After a predetermined time, the hot water temperature is raised again to a predetermined temperature or higher.
[0023]
  Therefore, the convenience of the thermos warming mode is improved as compared with the conventional case, and the original energy saving performance itself is effectively utilized.
DETAILED DESCRIPTION OF THE INVENTION
[0024]
  Hereinafter, with reference to the attached drawings, first, the configuration and operation of an electric pot main body part and a control device part common to each embodiment described later of the electric pot of the present invention will be described.
[0025]
  (Configuration of the electric pot body)
  First, FIGS. 1 to 3 show the configuration of the main body and the main part of an electric pot common to each embodiment of the present invention to be described later.
[0026]
  First, 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 for opening and closing an upper opening of the container body 1, and the inner container. 4A, a water heater 4A that is a heating means that heats the inner container 3 when it is heated, a heat retaining heater 4B that is a heating means that heats the inner container 3, and a hot water supply that supplies the hot water in the inner container 3 to the outside The hot water in the inner vessel 3 is externally passed through the hot water supply passage 5 in a state where the passage 5, the flow rate sensor 80 for measuring the actual flow rate provided in the middle of the hot water supply passage 5, and the AC power source are connected. An electric hot water supply pump 6 for sending out and an air-type manual hot water supply pump 18 for sending out the 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.
[0027]
  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.
[0028]
  The inner container 3 is, for example, a vacuum double wall structure with high heat insulation 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. A single plate portion 3a constituted only by the bottom surface portion of the inner cylinder 10 excluding the outer peripheral portion is formed at the bottom portion thereof. The single plate portion 3a is formed so as to protrude slightly upward. On the lower surface side thereof, 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.
[0029]
  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 full water level WL of the inner container 3.₂It is a convex full water level display part which displays. WL₁Indicates a low water level (1/2 water level).
[0030]
  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.
[0031]
  The lid 2 is manually pressed so that hot water can be supplied to the outside through the hot water supply passage 5 even when AC power is not connected (magnet catch-type power plug is removed). An air-type manual hot water supply pump 18 that is compressed is provided. 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. Reference numeral 22 is a tipping water that is provided in the middle of the steam discharge passages 21a to 21d on the steam outlet 21a side. It is a valve.
[0032]
  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.
[0033]
  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.
[0034]
  Furthermore, reference numeral 35 denotes an operation panel unit having an operation surface of various switches described later and a display surface of a liquid crystal display unit, and 51a denotes a microcomputer control unit 60 and various switches 38 to 41, 42, 43 described below. A microcomputer board provided with a liquid crystal display device (drive unit) and the like, 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.
[0035]
  The operation panel 35 includes a hot water switch 38, a hot water lock release switch 39, a reboil / warm selection switch 40, a good night timer switch 41, up and down switches 42 and 43 for setting the hot water amount when the fixed amount hot water mode is selected, and reboil. A display LED 44, a heat retaining operation display LED 45, a hot water supply unlock display LED 46, a liquid crystal display unit 47, and the like are provided. Each of the switches 38, 39, 40, 41, 42 and 43 is of an operation key type, and the ON / OFF state of each switch section by the operation of each operation key is a microcomputer control section which will be described later. 60 is input.
[0036]
  The liquid crystal display unit 47 is provided with, for example, a time / time / hot water / operating state combined display unit 47a, a heat retention set temperature display unit 47b, a magic bottle heat retention display unit 47c, and various convenient information displays. Has been made.
[0037]
  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 pour out hot water as long as the hot water supply switch 38 is continuously pressed, and even if the hot water supply switch 38 is continuously pressed, When a predetermined amount of hot water set by the up / down switches 42 and 43 is poured, the electric hot water supply pump 6 stops and the two hot water supply modes are provided.
[0038]
  And the flow sensor 80 used for it loosely fits the spiral rotating screw blade | wing 82 via the cylindrical hub on the outer periphery of the rotating support shaft 81, for example, and they are the upper ends of the straight pipe part 5b of the hot water supply channel | path 5 Are fitted and fixed via a fitting cylinder 83.
[0039]
  (Configuration of control circuit)
  Next, FIG. 3 is a block diagram showing the configuration of the control circuit unit in the electric pot body configured as described above.
[0040]
  In FIG. 3, reference numeral 57 includes, for example, a smoothing capacitor and a power supply IC, and includes a microcomputer control unit 60, a heating control unit 54, a DC power supply unit for supplying DC power to the pump power supply unit 55, and the like. Heating control unit for ON / OFF control of the heat retaining heater 4B, 4A and 4B are heating means comprising the above-described hot water heater 4A and heat retaining heater 4B, 38 to 43 are the above-mentioned hot water supply switches and other switches, and 6 is the above-described DC type This is an electric hot water pump.
[0041]
  For example, when the heater control signal is output from the microcomputer control unit 60 to the heating control unit 54, the water heater 4A operates a power relay via a transistor (not shown), for example, and a power switch is correspondingly operated. Heating control is performed by turning ON. In the case of the present invention, the microcomputer control unit 60 turns on the power supply relay to perform hot water boiling when the boiling switch 40 is pressed, even when the heat retention control mode of the electric pot is, for example, the thermos heat retention mode. .
[0042]
  Further, when the heat retaining heater 4B shifts to the heat retaining state after the boiling is completed and the microcomputer control unit 60 outputs a heat retaining heater ON signal to the heating control unit 54, for example, a transistor (not shown) is turned on. Thus, the heating is controlled by driving the triac.
[0043]
  The microcomputer control unit 60 further includes various LED display units such as a liquid crystal display unit 47, a reboil display LED 44, a heat retention operation display LED 45, a hot water supply unlock display LED 46, a hot water switch 38, and a reboil / warm selection. Various operation units such as a switch 40, a hot water supply unlocking switch 39, a nighttime timer switch 41, and various sensor units such as a bottom sensor (thermistor) 12, a flow rate sensor 80, and the like are connected via input / output ports (not shown). .
[0044]
  In the above-described electric pot, when the water heater is used, the water heater 4A is used to quickly heat it to a boiling state with a high heating output, and then a boiling notification by buzzer sound (water heating completion notification) is performed to make the water heater 4A. Is turned OFF, and then the process proceeds to a heat retaining step (heat retaining state).
[0045]
  In the heat retention step, the heat retention selection switch 40 is used, for example, the normal heat retention mode and the heat retention heater 4B for maintaining the temperature at two heat retention set temperatures, for example, the first set heat retention temperature 98 ° C. and the second set heat retention temperature 90 ° C. Two types of heat-retaining modes are prepared, which are a thermos bottle heat-retaining mode for keeping the temperature in the thermos state with OFF.
[0046]
  First, in the normal warming mode, the warming heater 4B is heated and controlled, and the actual hot water temperature T detected by the bottom sensor (hot water temperature sensor) 12 is centered on the warming selection switch 40 and the microcomputer controller 60. When the temperature corresponds to the first set heat retention temperature 98 ° C. or the second set heat retention temperature 90 ° C. set by the heat insulation temperature setting means, the corresponding hot water temperature is displayed on the hot water temperature display section of the liquid crystal display section 47. To do. Next, in the magic bottle heat retaining mode, the heat retaining heater 4B is turned off, and the heat is retained by the heat insulating heat retaining function by the thermos structure of the inner container 3 itself.
[0047]
  And in the invention of this application, even in the magic bottle heat retention mode, as shown in each of the following embodiments, it is possible to perform boiling water as necessary to achieve both energy saving and convenience in use. Yes.
[0048]
  (Embodiment 1)
  First, FIG. 4 is a flowchart showing the contents of the thermos bottle warming control of the electric pot according to the first embodiment of the present invention.
[0049]
  That is, in the control, first, step S₁Whether or not the current operation state of the electric pot is during the heat insulation in which the water heater 4A is OFF and the heat insulation operation display LED 45 is lit (when only the heat insulation heater 4B is ON). judge. As a result, when NO is not being kept at the same time, the present control is terminated as it is (normally keeping warm). On the other hand, when YES is being maintained, the next step S₂Then, it is determined whether or not the heat retention selection switch 40 is in the thermos warming state in which the thermos bottle warming mode is selected.
[0050]
  As a result, when the temperature is not in the NO thermos heat retention state, the present control is finished as it is (normal heat retention is continued). On the other hand, in the case where the thermos is kept warm, the next step S_ThreeThen, after the hot water temperature T in the inner container 3 is measured by the bottom sensor 12, the step S is further performed._FourThen, it is determined whether or not the measured 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).
[0051]
  As a result, when the result is NO, the present control is finished as it is (the magic bottle is kept warm). 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 reduced by, for example, 60 ° C. by continuing the thermos warming state for a predetermined time (for example, 2-3 hours). Recognizing that the following low water temperature has been reached, step S_FiveThen, the above-described water heater 4A is turned on, the water is heated and heating control is performed, for example, heating is performed to a boiling state.
[0052]
  As a result, according to the thermos thermal insulation control, even in the thermos thermal insulation state where no heating control has been performed in the past, boiling water is made as needed, and once the thermal insulation time has passed, the temperature is once below a predetermined value. Even if the hot water temperature falls, the hot water temperature is raised again to a predetermined temperature or higher again after a predetermined time, and these steps are repeated, so that the user does not have to use the cold hot water.
[0053]
  Therefore, the convenience of the magic bottle heat retention mode is improved as compared with the conventional case, and the original energy saving performance itself is effectively utilized.
[0054]
  In the above description, step S_FiveIn the final water heating step, for example, the water is heated to the boiling state and the heating control is performed. This is, for example, the first and second heat retention set temperatures 98 ° C. and 90 ° C. that can be selected by the heat retention selection switch 40 described above. Of course, it is also possible to control the heating up to an arbitrary set temperature which is higher than the above 60 ° C. by a predetermined temperature or more.
[0055]
  By the way, on the other hand, when the boiling water is stopped at a temperature lower than the boiling temperature,Because there is no convection and the temperature of the whole hot water does not rise uniformly,After returning to the thermos warming state again after stopping the boiling, the water was boiled to the boiling temperature.There is effective convectionCompared to the time, the temperature of the hot water decreases rapidly.
[0056]
  Therefore, in this case, the thermos warming state is not restored until the water boiling to the predetermined temperature is repeated a predetermined number of times.The
[0057]
  In this way, due to the effective convection in the inner container caused by repeating the predetermined number of times of boiling water, the entire hot water in the inner container 3 is sufficiently heated, and the hot water temperature distribution becomes uniform. The decrease in hot water temperature is suppressed as much as possible.
[0058]
  (Embodiment 2)
  Next, FIG. 5 is a flowchart showing the contents of the thermos warming control of the electric pot according to the second embodiment of the present invention.
[0059]
  That is, in the control, first, step S₁Whether or not the current operation state of the electric pot is during the heat insulation in which the water heater 4A is OFF and the heat insulation operation display LED 45 is lit (when only the heat insulation heater 4B is ON). judge. As a result, when NO is not being kept at the same time, the present control is terminated as it is (normal heat keeping control is executed). On the other hand, when YES is being maintained, the next step S₂Then, it is determined whether or not the heat retention selection switch 40 is in the thermos warming state in which the thermos bottle warming mode is selected.
[0060]
  As a result, when the temperature is not in the NO thermos heat retention state, the present control is terminated as it is (normal heat retention control is continued). On the other hand, in the case where the thermos is kept warm, the next step S_ThreeThe temperature keeping elapsed time during which the hot water temperature T in the inner container 3 falls below a predetermined set temperature Ts (for example, Ts is a limit temperature 60 ° C. that can be used as hot water as described above) in a predetermined outside air temperature state. The count operation of the timer t that counts ts is started. Next, step S_FourThen, 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.
[0061]
  As a result, at the time of NO, this control is finished as it is (continuation of the thermos thermal insulation control). On the other hand, when it is determined that the heat retention elapsed time ts of YES has elapsed and the temperature of the hot water in the inner container 3 has dropped to a limit temperature of 60 ° C. or less that can be used as the hot water, step S_FiveThen, the above-described water heater 4A is turned on, the water is heated and heating control is performed, for example, heating is performed to a boiling state.
[0062]
  As a result, according to the thermos thermal insulation control, even in the thermos thermal insulation state where no heating control has been performed in the past, boiling water is made as needed, and once the thermal insulation time has passed, the temperature is once below a predetermined value. Even if the hot water temperature decreases, the hot water temperature is raised to a predetermined temperature or higher again after a predetermined time.
[0063]
  Therefore, the convenience of the magic bottle heat retention mode is improved as compared with the conventional case, and the original energy saving performance itself is effectively utilized.
[0064]
  In the above description, in the final water heating process, for example, the water heating is performed until the boiling state, and the heating control is performed. For example, the first and second heat retention settings that can be selected by the heat retention selection switch 40 described above. The heating may be controlled to a temperature of 98 ° C., 90 ° C., or any other set temperature that is at least a predetermined temperature higher than 60 ° C.
[0065]
  And, if you stop boiling at a temperature lower than the boiling temperature,Because there is no convection and the temperature of the whole hot water does not rise uniformly,After returning to the thermos warming state after boiling down, boiled until boilingThere is effective convectionCompared to the time, the temperature of the hot water decreases rapidly.
[0066]
  Therefore, in this case, the thermos warming state is not restored until the water boiling to the predetermined temperature is repeated a predetermined number of times.The
[0067]
  In this way, due to the effective convection in the inner container caused by repeating the predetermined number of times of boiling water, the entire hot water in the inner container 3 is sufficiently heated, and the hot water temperature distribution becomes uniform. The decrease in hot water temperature is suppressed as much as possible.
[0068]
  (Embodiment 3)
  Next, FIG. 6 is a flowchart showing the contents of the thermos warming control of the electric pot according to the third embodiment of the present invention.
[0069]
  That is, in the control, first, step S₁Whether or not the current operation state of the electric pot is during the heat insulation in which the water heater 4A is OFF and the heat insulation operation display LED 45 is lit (when only the heat insulation heater 4B is ON). judge. As a result, when NO is not being kept at the same time, the present control is terminated as it is (normal heat keeping control is executed). On the other hand, when YES is being maintained, the next step S₂Then, it is determined whether or not the heat retention selection switch 40 is in the thermos warming state in which the thermos bottle warming mode is selected.
[0070]
  As a result, when the temperature is not in the NO thermos heat retention state, the present control is terminated as it is (normal heat retention control is continued). On the other hand, in the case where the thermos is kept warm, the next step S_ThreeThe hot water temperature T in the inner container 3 is measured by the bottom sensor 12.₁After measuring (the first hot water temperature), further step S_FourThen, the timer operation of a 5-second timer for counting a predetermined elapsed time of 5 seconds is started. And the following step S_FiveIt is determined that the same time of 5 seconds has elapsed, and if YES, step S₆Again, hot water temperature T in the inner container 3₂Measure (second hot water temperature). And the second hot water temperature T measured within 5 seconds for the same measurement.₂And 1st hot water temperature T₁Difference Ts (Ts = T₁-T₂) Is larger than a predetermined temperature range of 5 ° C. or more, step S₇Judge with.
[0071]
  As a result, when the answer is NO, the present control is finished as it is (the thermos bottle is kept warm). On the other hand, the first and second measured hot water temperatures T of YES₁, T₂When the temperature difference Ts in 5 seconds is 5 ° C. or more and the temperature decrease rate is much faster than the normal temperature decrease rate during natural heat radiation, the water injection was performed in the thermos heat retaining state. Recognizing that the temperature has dropped significantly, step S₈Then, the above-described water heater 4A is turned on, the water is heated and heating control is performed, for example, heating is performed to a boiling state.
[0072]
  As a result, according to the thermos thermal insulation control, even in the thermos thermal insulation state where no heating control has been performed in the past, the hot water can be boiled as needed, and the hot water is suddenly reduced to a predetermined value or less once by water injection. Even if the temperature is lowered, the hot water temperature is raised to a predetermined temperature or higher again after a predetermined time.
[0073]
  Therefore, the convenience of the magic bottle heat retention mode is improved as compared with the conventional case, and the original energy saving performance itself is effectively utilized.
[0074]
  (Embodiment 4)
  In addition, in the thermos heat insulation state as described above, the magnet catch structure power plug is generally pulled out and carried, and in such a case, a considerable amount of time has passed when the power plug is connected again. There are many cases.
[0075]
  Therefore, in the thermos warming state, the thermos bottle warming mode can be maintained as it is even when the power plug is once unplugged and then connected again. It is also effective to increase the hot water temperature by performing hot water heating control as shown in FIGS.
[0076]
  The boiling water in this case may be up to the above-mentioned predetermined temperature instead of boiling.
[0077]
  (Other embodiments)
  Furthermore, as embodiments of the present invention, in addition to the above embodiments, the following various embodiments utilizing the gist are adopted.
[0078]
  (1) As described above, in the electric pot of the present invention, the liquid crystal display unit 47 is provided in the operation panel unit.
[0079]
  Therefore, for example, in the configuration of each of the embodiments described above, it is possible to warn the user by displaying the passage of the heat retention time or the decrease in the hot water temperature due to water injection on the hot water temperature display unit and flicking the display. is there.
[0080]
  (2) When holding the thermos, once the power plug is unplugged, the setting of the warming temperature until then is changed, and when the power plug is connected again, the same hot water heating as in the above embodiments is newly set. Do so up to the specified temperature.
[0081]
  (3) When the rest timer is set in the thermos warming state, the hot water is heated every time a predetermined time elapses until the set time of the timer elapses.
[Brief description of the drawings]
FIG. 1 is a central longitudinal sectional view, seen from the right side, showing the configuration of an electric pot body portion common to each embodiment of the present invention.
FIG. 2 is a plan view of the electric pot main body.
FIG. 3 is a control block circuit diagram of the electric pot main body.
FIG. 4 is a flowchart showing the contents of a thermos heat retention control according to the first embodiment of the present invention.
FIG. 5 is a flowchart showing the contents of thermos heat insulation control according to Embodiment 2 of the present invention.
FIG. 6 is a flowchart showing the contents of thermos heat insulation control according to Embodiment 3 of the present invention.
[Explanation of symbols]
  1 is a container body, 2 is a lid body, 3 is an inner container, 4A is a hot water heater, 4B is a heat retaining heater, 5 is a hot water supply passage, 6 is an electric hot water supply pump, 7 is an outer case, 10 inner cylinders, 11 is an outer cylinder, Reference numeral 12 is a bottom sensor, 18 is a manual hot water supply pump, 47 is a liquid crystal display unit, 47b is a heat retention set temperature display unit, 60 is a microcomputer control unit, and 80 is a flow rate sensor.

Claims (2)

An inner container having a heat insulating structure capable of boiling water and holding a thermos, a boiling water heating means for heating the inner container when boiling, a warming temperature setting means for setting a warming temperature of the hot water in the inner container, and a normal warming time A warming and heating means for heating the inner container, a hot water temperature detecting means for detecting the hot water temperature in the inner container during normal warming and thermos warming, and a normal warming state and a thermos warming state of the inner container are arbitrarily set. In an electric pot comprising a heat retention selection means to select, when the thermos warming state is selected by the heat retention selection means, the hot water temperature detection means detects separately from the water boiling by turning on the reboiling switch. When the hot water temperature is below a predetermined temperature lower than the set temperature, the hot water heating means is controlled to boil until the boiling state or the set temperature is reached. Write, when the set retained temperature at that time is lower than the boiling temperature, an electric kettle, characterized in that a kettle control means for returning the thermos insulation state after the kettle to the set retained temperature is repeated a predetermined number of times. An inner container having a heat insulating structure capable of boiling water and holding a thermos, a boiling water heating means for heating the inner container when boiling, a warming temperature setting means for setting a warming temperature of the hot water in the inner container, and a normal warming time A warming and heating means for heating the inner container, a hot water temperature detecting means for detecting the hot water temperature in the inner container during normal warming and thermos warming, and a normal warming state and a thermos warming state of the inner container are arbitrarily set. In the electric pot comprising the heat retention selection means to be selected, when the thermos warming state is selected by the heat retention selection means, the thermos warming state is selected separately from the boiling by the ON operation of the reboiling switch. When a predetermined time or more has elapsed, the above-mentioned boiling water heating means is controlled to perform boiling water until the boiling state or the set temperature is reached, while the set temperature is maintained at that time. Degree is lower than the boiling temperature, an electric kettle, characterized in that the kettle to the set retained temperature provided kettle control means for returning the thermos insulation state after repeating a predetermined number of times.

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