JP2009247687A - Electric kettle - Google Patents

Abstract

Provided is an electric pot that performs alarm notification for alerting a user according to whether or not there is a problem with safety when detecting a state in which a lid is opened.
A container body 1 having an inner container 3 for hot water storage, a lid 2 of the inner container, a hot water heater 4a and a heat retaining heater 4b, and a hot water supply passage 5 for supplying hot water in the inner container to the outside. A hot water supply pump 6 for sending hot water in the inner container to the outside through the hot water supply passage, a hot water temperature sensor 12 for detecting the temperature of the hot water in the inner container, and a lid opening / closing sensor for detecting the open / closed state of the lid 22, an alarm notification unit 52 that generates an alarm sound, a control unit 41 that controls the operation of the hot water heater and the insulation heater, the operation based on the output of the hot water sensor and the lid opening / closing sensor, and the operation of the alarm notification unit. . A control part operates an alarm alerting | reporting part, when it detects that the open state of a cover body is detected by the lid | cover open / close sensor, and the hot water temperature is more than predetermined value by a hot water temperature sensor.
[Selection] Figure 1

Description

  The present invention relates to an electric pot, and more particularly to a configuration for ensuring safety when a lid of an opening of an inner container for hot water storage is opened.

  Generally, in an electric pot, water stored in an inner container is heated and boiled by an electric heater which is a heating means, and then stored at a predetermined temperature. Accordingly, when the lid of the inner container is opened, the hot water is exposed, and there is a risk of burns and the like for the user. For this reason, it is desirable to detect when the lid is opened, and to give a warning such as alarm notification or alarm display for urging the user to pay attention.

Further, there is a known problem that when the lid is opened, dew that has condensed on the lid falls to the power plug and an electrical short circuit occurs. In order to solve this problem, Patent Document 1 discloses a structure that prevents dew condensation on the lid by heating means installed on the lid. Further, it is also described that a lid opening / closing detection means is provided, and when the opening of the lid is detected when adding water, the heating means of the lid is turned off. That is, when the lid is open, there is no risk of condensation and there is no need to heat the lid, so when the lid is open, the heating of the lid is turned off to save power. .
JP-A-5-115366

  As described above, Patent Document 1 describes that the lid portion is opened and performs control based on the detection, but the configuration that calls attention to ensure the safety of the user is described. There is no.

  In addition, since the work of adding water to the electric pot is performed on a daily basis, if an alarm is notified by detecting the open state of the lid each time, it becomes complicated for the user. Therefore, it is desirable that when detecting the open state of the lid, a measure for ensuring safety is taken depending on whether or not there is a high risk of harm to the user.

  Therefore, the present invention provides an electric pot having a function of performing an alarm notification for alerting the user based on the result of detecting the open state of the lid, depending on whether or not there is a problem with safety. The purpose is to provide.

  An electric pot according to the present invention includes a container body having an inner container for hot water storage having an upper opening, a lid for opening and closing the upper opening of the inner container, and heating the inner container during boiling. A hot water heater, a heat retaining heater for heating the inside of the inner container at the time of heat retention, a hot water supply passage for supplying hot water in the inner container to the outside, and the hot water in the inner container through the hot water supply passage to the outside A hot water supply pump for sending out the hot water, a hot water temperature sensor for detecting the temperature of the hot water in the inner container, a lid open / close sensor for detecting the open / closed state of the lid, an alarm notifying unit for generating an alarm sound, and the water heater A controller that controls energization of the heater and the heat retaining heater, an operation based on outputs of the hot water temperature sensor and the lid opening / closing sensor, and an operation of the alarm notification unit.

  In order to solve the above-described problem, the control unit detects the open state of the lid body by the lid opening / closing sensor and detects that the hot water temperature is equal to or higher than a predetermined value by the hot water temperature sensor. The alarm notification unit is operated.

  According to the electric pot having the above-described configuration, the alarm notification is activated only when the degree of danger is high, not only by opening and closing the lid, but also in combination with hot water temperature. Therefore, even when a state where the lid is opened is detected, alarm notification is appropriately performed according to safety, and it is possible to avoid complications due to an unnecessary warning.

  The electric pot of the present invention can take the following aspects based on the above configuration.

  That is, when the open state of the lid is detected by the lid open / close sensor, even if the hot water temperature detected by the hot water temperature sensor is less than a predetermined value, the hot water heater or the heat retaining heater is energized. In some cases, the alarm notification unit may be operated to display or notify.

  Further, when the open state of the lid is detected by the lid open / close sensor and the hot water temperature sensor detects that the hot water temperature is equal to or higher than a predetermined value, the alarm notification unit is continuously operated, When the hot water temperature detected by the hot water temperature sensor becomes equal to or lower than a predetermined value, or when the predetermined temperature decreases, the operation of the alarm notification unit can be stopped.

  Moreover, when the open state of the lid is detected by the lid open / close sensor, the energization of the water heater or the heat retaining heater is stopped or the heater output is reduced.

  In this configuration, after the energization of the hot water heater or the heat retaining heater is stopped or the heater output is reduced, the hot water temperature sensor detects the closed state of the lid body by the lid open / close sensor. Depending on the hot water temperature, it is possible to start energization in the normal state of the water heater or the heat retaining heater.

  Alternatively, when the hot water temperature detected by the hot water temperature sensor becomes a predetermined value or lower, or when the hot water temperature decreases by a predetermined temperature, energization of the hot water heater in a normal state can be started.

  Alternatively, after the energization of the hot water heater or the heat retaining heater is stopped or the heater output is reduced, the hot water temperature detected by the hot water temperature sensor is detected when the closed state of the lid is detected by the lid open / close sensor. Regardless of the temperature, the water heater can be energized in a normal state.

  In addition, a notification stop switch for stopping notification by the alarm notification unit, it is possible to be in a notification stop state by the notification stop switch during the operation of the alarm notification unit, and after entering the notification stop state, When the closed state of the lid is detected by the lid open / close sensor, the notification stop state can be released.

  Hereinafter, the configuration and operation of an electric pot according to an embodiment of the present invention will be described with reference to the accompanying drawings. First, the structure of the electric pot and the control circuit common to the embodiments will be described.

(Structure of electric pot)
First, with reference to FIGS. 1-3, the structure of the main body and main part of the electric pot in Embodiment 1 is demonstrated.

  As shown in FIG. 1, the electric pot includes a container body 1 including an inner container 3 for storing hot water, and a lid body 2 that opens and closes an upper opening of the container body 1. Adjacent to the bottom of the inner container 3, there are provided a water heater 4 a that is a heating means at the time of boiling water, and a heat retention heater 4 b that is a heating means at the time of heat insulation. In addition, a hot water supply passage 5 that communicates with the inner container 3 to supply hot water stored therein to the outside is provided, and 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 is provided. Is provided.

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

  The inner container 3 is made of a vacuum double structure having a 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. The single plate portion 3a is formed so as to protrude slightly higher upward, and a hot water heater 4a and a heat retaining heater 4b are attached to the lower surface side thereof. The water heater 4a and the heat retaining heater 4b are composed of, for example, two sets of heating elements having different wattages.

  A water supply port 3 b is formed at the upper end of the inner container 3. A hot water temperature sensor 12 made of a thermistor is disposed at the bottom of the inner container 3 and is used to detect the temperature of the inner container 3, in other words, the temperature of the hot water in the inner container 3. On the inner wall surface of the inner container 3, a convex full water level display portion 13 that displays the full water level of the inner container 3 is formed.

  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. The lid body 2 is supported via a hinge pin 17 by a hinge receiver 16 provided at the rear portion of the shoulder member 8, and is openable and detachable in the vertical direction. A metal inner cover member 18 is fixed to the lower surface of the lower plate 15 in the lid 2. On the outer peripheral edge of the inner cover member 18, a heat-resistant rubber seal packing 19 is provided that is pressed against the upper surface of the water supply port 3 b of the inner container 3 when the lid 2 is closed.

  The electric hot water supply pump 6 is disposed at a lower position of the inner container 3 on the upstream end side of the hot water supply passage 5. Hot water discharged from the discharge port of the electric hot water supply pump 6 is guided to the hot water outlet 5 b through the straight pipe portion 5 a of the hot water supply passage 5.

  The operation panel unit 20 includes operation surfaces of various switches and a liquid crystal display panel. At the bottom of the operation panel 20, a microcomputer control unit and various switches, which will be described later, a microcomputer board having a drive unit for a liquid crystal display device, and the like, a drive circuit for the electric hot water supply pump 6, a water heater 4a, and a heat retaining heater 4b are provided. A circuit board 21 including a power supply board provided with a heating control circuit, a stabilized DC power supply circuit, and the like is disposed.

  FIG. 2 is an enlarged cross-sectional view of the upper portion of the electric pot of FIG. FIG. 2 shows the structure of the lid opening / closing sensor 22 that detects the open / closed state of the lid 2, which is a feature of the present embodiment. The lid opening / closing sensor 22 includes a reed switch 23 disposed at a location adjacent to the periphery of the lid 2 in the container body 1 and a permanent magnet 24 disposed at a location facing the reed switch 23 at the periphery of the lid 2. Composed. When the reed switch 23 and the permanent magnet 24 come close to or away from each other as the lid body 2 is opened and closed, the reed switch 23 is opened and closed, so that the lid body 2 is opened (lid open state) or closed ( Lid closed state) is detected.

  As another form of the lid opening / closing sensor, a protrusion may be provided at a location adjacent to the periphery of the lid body 2 in the container body 1, and the protrusion may be expanded and contracted as the lid body 2 is opened and closed. A switch is provided at the back of the protrusion, and the switch is opened / closed by expansion / contraction of the protrusion, whereby the open / close state of the lid 2 is detected.

  As shown in FIG. 3, the operation panel unit 20 includes a hot water supply switch 25, a hot water lock release switch 26, a reboiling switch 28, a timer switch 29, a selection switch 30 for selecting a constant hot water supply mode, and a heat retention switch. Switches 31a and 31b are provided. Further, a hot water supply lock release display LED 27, a re-boiling display LED 32, a heat retention operation display LED 33, and a liquid crystal display unit 34 for operation display and the like are provided. On the liquid crystal display surface 34, for example, time / time / hot water temperature setting temperature / magic bottle insulation is displayed. Further, a notification stop switch 35 and a notification stop display LED 36 are provided. The notification stop switch 35 is for selecting whether or not to notify the alarm of the lid open state based on the detection output of the lid opening / closing sensor 22 shown in FIG. The notification stop display LED 36 is for displaying whether or not the setting by the notification stop switch 35 is in a notification stop state.

  This electric hot water supply type electric kettle has two hot water supply modes, a continuous hot water supply mode and a fixed hot water supply mode. In the continuous hot water supply mode, the hot water supply pump 6 can be continuously driven to pour hot water as long as the hot water supply switch 25 is kept pressed on condition that the hot water supply lock release switch 26 is turned on. In the fixed amount hot water supply mode, even if the hot water supply lock release switch 26 is turned ON and the hot water supply switch 25 is kept pressed, when the predetermined amount of hot water is poured out, the electric hot water supply pump 6 stops and hot water supply is performed. Locked.

  When the lid open state is detected, it is desirable not to accept the “unlock” operation by the hot water supply lock release switch 26 and to disable hot water supply. In addition, it is desirable that alarm notification or display for further attention is given when the operation switch is pressed in the lid open state.

(Configuration of control circuit)
FIG. 4 is a circuit diagram showing a configuration of a control circuit provided in the electric pot body having the above configuration. In FIG. 4, reference numeral 40 is an AC power source, and 41 is a microcomputer control unit. The water heater 4a, the heat retaining heater 4b, and the pump 6 are those shown in FIG. The hot water supply switch 25 is shown in FIG. RS is a power switch (relay switch) for operating the water heater 4a, and RL is a power relay (relay drive circuit such as a relay coil) for driving the power switch RS. Reference numeral 42 denotes a triac for operating the heat retaining heater 4b, and reference numeral 43 denotes a transistor for driving the triac 42.

  Further, a hot water supply notification circuit 46 is provided for notifying the hot water supply condition on condition that the power supply voltage zero cross detection circuit 44, the smoothing capacitor 45, and the hot water supply switch 25 are turned on. The microcomputer control unit 41 is supplied with a predetermined constant voltage through a constant voltage power supply unit (original operation power supply) (not shown).

  Further, an LCD circuit 47, an LED circuit 48, a sensor circuit 49, a SW circuit 50, a clock oscillator 51, and an alarm circuit 52 are connected to the microcomputer control unit 41 via input / output ports. The LCD circuit 47 is a circuit for driving the liquid crystal display unit 34. The LED circuit 48 is a circuit for driving various display units such as the hot water supply lock release display LED 27, the reboil display LED 32, the heat retaining operation display LED 33, and the notification stop display LED 36. The sensor circuit 49 is a circuit for receiving outputs from various sensor units such as the hot water temperature sensor 12 and the lid opening / closing sensor 22. The SW circuit 50 is a circuit for receiving outputs from various operation units such as the hot water supply lock release switch 26, the reboiling switch 28, the timer switch 29, the selection switch 30, and the heat retention selection switches 31a and 31b. The clock oscillator 51 generates a clock signal for operating the microcomputer. The alarm circuit 52 is a circuit for generating an alarm sound.

  For example, when a water heater ON signal is output from the microcomputer controller 41, the water heater 4a is driven by first operating the power relay RL and correspondingly turning on the power switch RS. In addition, when the warming heater ON signal is output from the microcomputer control unit 41, the warming heater 4b is driven by turning on the transistor 43 and triggering the triac 42.

  When the hot water supply switch 25 inserted in the ground side line is turned on, the electric hot water supply pump 6 receives an ON signal of the hot water supply switch 25 via the hot water supply notification circuit 46 to the microcomputer control unit 41. Then, the microcomputer control unit 41 turns off the heat retaining heater 4b, and the microcomputer control unit 41 outputs a pulse voltage signal having a predetermined duty ratio, and is appropriately driven to rotate at the predetermined duty ratio.

  Below, the control operation | movement for ensuring the safety | security when the cover body 2 is an open state with the electric pot of the said structure in each embodiment of this invention is demonstrated.

(Embodiment 1)
FIG. 5 is a flowchart showing a control routine for ensuring safety in the lid open state in the first embodiment.

  In this control, first, in step S1, it is determined whether or not the hot water temperature detected by the hot water temperature sensor 12 is equal to or higher than the heat retention set temperature. The heat retention set temperature is set to 90 ° C., for example. In general, 90 ° C. is often initially set, but the selected temperature may be set to 98 ° C., 80 ° C., 70 ° C. or the like. If the hot water temperature is equal to or higher than the heat retention set temperature, the process proceeds to step S2, and the heat retention heater 4b is turned off. Thereafter, the process proceeds to step S4.

  In step S4, it is determined whether or not the open state of the lid 2 is detected by the lid opening / closing sensor 22. If the lid open state is not detected (NO), the process proceeds to step S5, the alarm notification is turned off, and the process returns to the start. When the lid open state is detected (YES), the process proceeds to step S6, and it is determined whether or not the hot water temperature is equal to or higher than a predetermined temperature (here, 50 ° C.). If the hot water temperature is 50 ° C. or higher, alarm notification is started in step S7, and then the process returns to the start. If the hot water temperature is less than 50 ° C., the process returns to the start.

  As described above, according to the present embodiment, even when the lid 2 is detected to be open, only when it is detected that the hot water temperature is equal to or higher than a predetermined value, alarm notification or Display. Therefore, it is possible to give a warning appropriately depending on whether or not there is a problem with safety, and it is possible to avoid complication due to an unnecessary warning.

  When the open state of the lid 2 is detected, even if the hot water temperature is less than a predetermined value, if the hot water heater 4a or the heat retaining heater 4b is energized, an alarm display or notification is performed. It is desirable.

  Further, when the lid open state is detected and an alarm is displayed / notified, it is desirable to turn off the heat retaining heater 4b or reduce the output. It is also possible to notify when the lid open state continues for a predetermined time or longer. Alternatively, after the power is turned on, a notification can also be made if the lid open state continues even if the water temperature becomes equal to or higher than the predetermined water temperature.

(Embodiment 2)
FIG. 6 is a flowchart showing a control routine for ensuring safety in the lid open state in the second embodiment. In this control, steps S1 to S4 are processed in the same procedure as in the first embodiment.

  If the cover open state is not detected in step S4, the process proceeds to step S5, the alarm notification is turned off, and the process returns to the start. When the lid open state is detected, the process proceeds to step S7, and alarm notification is started.

  Next, in step S8, it is determined whether or not water addition has been detected. The addition of water is detected when, for example, the hot water temperature detected by the hot water temperature sensor 12 is equal to or lower than a predetermined value or when the predetermined temperature is lowered. As a setting example of detection of water addition, for example, when the hot water temperature drops by 10 ° C. or more within 5 seconds, it is determined that water is added. If no water addition is detected, return to start. When the addition of water is detected, the process proceeds to step S9 and the alarm notification is stopped.

  As described above, according to the present embodiment, when the open state of the lid 2 is detected and the hot water temperature is detected to be equal to or higher than a predetermined value, the alarm display or notification is continuously operated, The alarm operation is stopped when the hot water temperature falls below a predetermined value due to the addition of water or the like or when the predetermined temperature drops. Thereby, an unnecessary alarm sound can be suppressed and noise can be reduced.

(Embodiment 3)
FIG. 7 is a flowchart showing a control routine for ensuring safety in the lid open state in the third embodiment.

  In this control, first, in step S10, it is determined whether or not a heat retaining process is performed. If it is not a heat retention process, it will progress to step S11 and it will be determined whether the water boiling process is performed. If it is not a kettle process, it will progress to step S12 and it will be determined whether it is a cover open state. If the lid is not open, return to the start.

  If it is determined in step S10 that the process is a heat retention process, the process proceeds to step S13, and it is determined whether or not the hot water temperature detected by the hot water temperature sensor 12 is equal to or higher than the heat retention set temperature. If the hot water temperature is equal to or higher than the heat retention set temperature, the process proceeds to step S14, the heat insulation heater 4b is turned off, and if the temperature is lower than the heat retention set temperature, the process proceeds to step S15, and after the heat insulation heater 4b is turned on, the process proceeds to step S11.

  If it is determined in step S11 that the process is a boiling water process, the process proceeds to step S16, and it is determined whether boiling is completed. If boiling has been completed, the process proceeds to step S17, and the water heater 4a is turned off. If boiling has not been completed, the process proceeds to step S18. After boiling the heater 4a, the process proceeds to step S12.

  If it is determined in step S12 that the lid is open, the process proceeds to step S19, the heat retaining heater 4b is turned off, the process further proceeds to step S20, the hot water is turned off, the heater 4a is turned off, and the process proceeds to step S21. In addition, it can also be set as the structure which ensures safety | security by reducing heater output instead of turning off the heat retaining heater 4b or the water heater 4a. In step S21, it is determined whether or not the lid is open, and the heaters 4a and 4b are kept off while the lid is open. When it is determined in step S21 that the lid is closed, the process proceeds to step S22.

  In step S22, it is determined whether or not the hot water temperature is 80 ° C. or higher. If the hot water temperature is lower than 80 ° C., the process proceeds to step S23 to set a boiling water process. If hot water temperature is 80 degreeC or more, it will progress to step S24 and will set a heat retention process. Then return to the start. Note that setting a water heating process means setting a water heating process flag. This is for storing which process, such as the “water heating process”, “warming process”, “saving timer process”, etc. included in the control process of the electric pot is executed and used for control.

  As described above, according to the present embodiment, when the open state of the lid body 2 is detected by the lid opening / closing sensor 22, the energization of the water heater 4a or the heat retaining heater 4b is stopped or the heater output is reduced. Thereby, safety is improved.

  In addition, after the energization of the water heater 4a or the heat retaining heater 4b is stopped, both heaters are kept off while the lid is open, and when the lid 2 is detected to be closed, the hot water temperature sensor 12 Depending on the detected hot water temperature, energization of the hot water heater 4a or the warming heater 4b in a normal state is started. That is, in the above-described example, if the hot water temperature is less than 80 ° C., the hot water boiling step is set, and if it is 80 ° C. or higher, the heat retaining step is set. Thereby, when it transfers to the closed state from the open state of the cover body 2, it transfers to an appropriate mode automatically and can improve the convenience.

(Embodiment 4)
FIG. 8 is a flowchart showing a control routine for ensuring safety in the lid open state in the fourth embodiment.

  In this control, steps S10 to S21 are performed in the same procedure as in the third embodiment. Also, when it is determined in step S21 that the lid is closed, the same processes from step S22 to S24 as in the third embodiment are performed.

  When it is determined in step S21 that the lid is open, the process proceeds to step S25, unlike in the third embodiment, and it is determined whether or not the addition of water is detected. Water addition is detected in the same manner as in the second embodiment. If no water addition is detected, the process returns to step S19. When the addition of water is detected, the process proceeds to step S26, and the water heating process is set. Further, in step S27, the water is heated and the heater 4a is turned on, and then the process returns to the start.

  As described above, according to the present embodiment, when the hot water heater 4a or the warming heater 4b is de-energized or the heater output is reduced, the hot water temperature becomes lower than a predetermined value or when the predetermined temperature is lowered. Then, energization of the water heater 4a in the normal state is started. Thereby, when hot water temperature falls by the addition of water, it transfers to a boiling process automatically and can improve the convenience.

(Embodiment 5)
FIG. 9 is a flowchart showing a control routine for ensuring safety in the lid open state in the fifth embodiment. In this control, steps S10 to S21 are performed in the same procedure as in the third embodiment.

  When it is determined in step S21 that the lid is open, the process returns to step S19, and the heaters 4a and 4b are kept off as in the third embodiment.

  When it is determined in step S21 that the lid is open, the process proceeds to step S23, unlike the third embodiment, and a water heating process is set. Further, in step S27, the water is heated and the heater 4a is turned on, and then the process returns to the start.

  As described above, according to the present embodiment, when the closed state of the lid body 2 is detected by the lid opening / closing sensor 22 after the energization of the water heater 4a or the heat retaining heater 4b is stopped, the hot water temperature sensor 12 detects it. Regardless of the hot water temperature, energization of the water heater 4a in the normal state is started. Thereby, hygiene safety can be ensured.

(Embodiment 6)
FIG. 10 is a flowchart showing a control routine for ensuring safety in the lid open state in the sixth embodiment.

  In this control, when any of the water boiling process (step S30), the heat retaining process (step S31), and the timer process (step S32) is performed, in step S33, it is determined whether or not the notification stop switch is pressed. judge. If the notification stop switch has been pressed, the process proceeds to step S34, the notification flag is turned off, and then the process proceeds to step S35. If the notification stop switch has not been pressed, the process immediately proceeds to step S35.

  In step S35, it is detected whether or not the lid body 2 is closed. If the lid 2 is closed, the process proceeds to step S36, the notification flag is turned off, and then the process proceeds to step S37. If the lid 2 is not closed, the process immediately proceeds to step S37.

  In step S37, it is detected whether or not the lid body 2 is opened. If not open, return to the start. If it is open, the process proceeds to step S38, and it is determined whether or not a notification flag is set. If the notification flag is set, the process proceeds to step S39. If the notification flag is not set, the process proceeds to step S40.

  In step S39, it is determined whether the notification flag is on. If the notification flag is off, the process returns to the start. If the notification flag is on, the process proceeds to step S40.

  In step S40, it is determined whether or not the water heating process is in progress. If it is in the process of boiling water, it will progress to step S41 and will alert | report by a 1st alarm sound. If it is not in the hot water boiling process, it will progress to step S42 and it will be determined whether it is in a heat retention process. If it is during the heat insulation process, the process proceeds to step S43, and a notification is given by the second alarm sound. If it is not in the heat retention process, the process proceeds to step S44, and a notification by the third alarm sound is performed. After steps S41, S43, and S44, the process returns to the start.

  As described above, according to the present embodiment, it is possible to set the notification stop state by the notification stop switch 35 during the alarm operation, and after the notification stop state is reached, the closed state of the lid 2 is detected. Sometimes, the notification stop state is canceled. That is, the alarm notification can be stopped when the alarm sound is unnecessary, but the stop is reset by closing the lid 2, and the alarm notification stop state is not maintained and always shifts to the safe side. .

  Moreover, the first to third alarm sounds can be prepared, and different types of alarm sounds can be generated according to the state when the alarm is notified.

  According to the present invention, when the lid is opened, an alarm can be operated according to the degree of safety, which is useful for ensuring the safety of the electric pot within a practically appropriate range.

Sectional drawing which shows the structure of the electric pot in embodiment of this invention The top view which shows the operation panel part of the same electric pot Expanded sectional view of the main part of the electric pot Circuit diagram showing the configuration of the control circuit section of the electric pot The flowchart which shows the control routine for ensuring the safety | security in the case of the lid | cover open state of the electric pot in Embodiment 1. The flowchart which shows the control routine for ensuring the safety | security in the case of the lid open state of the electric pot in Embodiment 2. The flowchart which shows the control routine for ensuring the safety | security in the case of the lid | cover open state of the electric pot in Embodiment 3. The flowchart which shows the control routine for ensuring the safety | security in the case of the lid | cover open state of the electric pot in Embodiment 4. The flowchart which shows the control routine for ensuring the safety | security in the case of the lid open state of the electric pot in Embodiment 5. The flowchart which shows the control routine for ensuring the safety | security in the case of the lid | cover open state of the electric pot in Embodiment 6.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Container main body 2 Lid 3 Inner container 3a Single plate part 3b Water supply port 4a Hot water heater 4b Heat retention heater 5 Hot water supply passage 5a Straight pipe part 5b Hot water outlet 6 Electric hot water supply pump 7 Outer case 8 Shoulder member 9 Bottom member 10 Inner cylinder DESCRIPTION OF SYMBOLS 11 Outer cylinder 12 Temperature sensor 13 Full water level display part 14 Upper board 15 Lower board 16 Hinge receiver 17 Hinge pin 18 Inner cover member 19 Seal packing 20 Operation panel part 21 Circuit board 22 Lid opening / closing sensor 23 Reed switch 24 Permanent magnet 25 Hot water supply switch 26 Hot water lock release switch 27 LED for hot water lock release indication
28 Re-boiling switch 29 Timer switch 30 Selection switch 31a, 31b Thermal insulation selection switch 32 LED for re-boiling display
33 Insulation LED
34 Liquid crystal display 35 Notification stop switch 36 Notification stop display LED
40 AC power supply 41 Microcomputer control unit 42 Triac 43 Triac driving transistor 44 Zero-cross detection circuit 45 Smoothing capacitor 46 Hot water supply notification circuit 47 LCD circuit 48 LED circuit 49 Sensor circuit 50 SW circuit 51 Clock oscillator 52 Alarm circuit

Claims (8)

A container body including an inner container for hot water storage having an upper opening;
A lid for opening and closing the upper opening of the inner container;
A water heater for heating the inner container during boiling;
A heat retaining heater for heating the inner container during heat retention;
A hot water supply passage for supplying hot water in the inner container to the outside;
A hot water supply pump for sending out the hot water in the inner container to the outside through the hot water supply passage;
A hot water temperature sensor for detecting the temperature of the hot water in the inner container;
A lid opening / closing sensor for detecting an opening / closing state of the lid;
An alarm notification unit for generating an alarm sound;
A controller that controls energization of the hot water heater and the heat retaining heater, an operation based on outputs of the hot water temperature sensor and the lid opening / closing sensor, and an operation of the alarm notification unit,
The control unit operates the alarm notification unit when the open state of the lid is detected by the lid opening / closing sensor and the hot water temperature sensor detects that the hot water temperature is equal to or higher than a predetermined value. An electric kettle characterized by.   When the lid opening / closing sensor detects the open state of the lid, even when the hot water temperature detected by the hot water temperature sensor is less than a predetermined value, the hot water heater or the heat retaining heater is energized. The electric pot according to claim 1, wherein the alarm notification unit is operated to perform display or notification. When the lid opening / closing sensor detects the open state of the lid body and the hot water temperature sensor detects that the hot water temperature is equal to or higher than a predetermined value, the alarm notification unit is continuously operated,
The electric kettle according to claim 1, wherein when the hot water temperature detected by the hot water temperature sensor becomes a predetermined value or less, or when the predetermined temperature is lowered, the operation of the alarm notification unit is stopped.   The electric pot according to claim 1, wherein when the lid opening / closing sensor detects an open state of the lid body, energization of the water heater or the heat retaining heater is stopped or the heater output is reduced.   After the energization of the hot water heater or the heat retaining heater is stopped or the heater output is reduced, the hot water temperature detected by the hot water temperature sensor is detected when the closed state of the lid body is detected by the lid open / close sensor. The electric kettle according to claim 4 which starts energization of the normal state of the normal state of the hot water heater or the heat retention heater according to this.   The electric kettle according to claim 4, wherein when the hot water temperature detected by the hot water temperature sensor becomes equal to or lower than a predetermined value, or when the predetermined temperature is lowered, energization of the hot water heater in a normal state is started.   After the energization of the hot water heater or the heat retaining heater is stopped or the heater output is reduced, the hot water temperature detected by the hot water temperature sensor is detected when the closed state of the lid body is detected by the lid open / close sensor. Regardless, the electric kettle according to claim 4 starts energization in a normal state of the water heater. A notification stop switch for stopping notification by the alarm notification unit;
During the operation of the alarm notification unit, it is possible to make a notification stop state by the notification stop switch,
The electric pot according to claim 1, wherein the notification stop state is canceled when the lid opening / closing sensor detects a closed state of the lid after the notification stop state.

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