WO2016035592A1 - 蒸気発生装置および加熱調理器 - Google Patents
蒸気発生装置および加熱調理器 Download PDFInfo
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- WO2016035592A1 WO2016035592A1 PCT/JP2015/073671 JP2015073671W WO2016035592A1 WO 2016035592 A1 WO2016035592 A1 WO 2016035592A1 JP 2015073671 W JP2015073671 W JP 2015073671W WO 2016035592 A1 WO2016035592 A1 WO 2016035592A1
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- Prior art keywords
- water
- housing
- time
- steam
- heating
- Prior art date
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Classifications
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J27/00—Cooking-vessels
- A47J27/04—Cooking-vessels for cooking food in steam; Devices for extracting fruit juice by means of steam ; Vacuum cooking vessels
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- A—HUMAN NECESSITIES
- A21—BAKING; EDIBLE DOUGHS
- A21B—BAKERS' OVENS; MACHINES OR EQUIPMENT FOR BAKING
- A21B3/00—Parts or accessories of ovens
- A21B3/04—Air-treatment devices for ovens, e.g. regulating humidity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/28—Methods of steam generation characterised by form of heating method in boilers heated electrically
- F22B1/284—Methods of steam generation characterised by form of heating method in boilers heated electrically with water in reservoirs
- F22B1/285—Methods of steam generation characterised by form of heating method in boilers heated electrically with water in reservoirs the water being fed by a pump to the reservoirs
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D5/00—Controlling water feed or water level; Automatic water feeding or water-level regulators
- F22D5/26—Automatic feed-control systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C15/00—Details
- F24C15/32—Arrangements of ducts for hot gases, e.g. in or around baking ovens
- F24C15/322—Arrangements of ducts for hot gases, e.g. in or around baking ovens with forced circulation
- F24C15/327—Arrangements of ducts for hot gases, e.g. in or around baking ovens with forced circulation with air moisturising
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- A—HUMAN NECESSITIES
- A21—BAKING; EDIBLE DOUGHS
- A21B—BAKERS' OVENS; MACHINES OR EQUIPMENT FOR BAKING
- A21B1/00—Bakers' ovens
- A21B1/02—Bakers' ovens characterised by the heating arrangements
- A21B1/24—Ovens heated by media flowing therethrough
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J27/00—Cooking-vessels
- A47J27/04—Cooking-vessels for cooking food in steam; Devices for extracting fruit juice by means of steam ; Vacuum cooking vessels
- A47J2027/043—Cooking-vessels for cooking food in steam; Devices for extracting fruit juice by means of steam ; Vacuum cooking vessels for cooking food in steam
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J2203/00—Devices having filling level indicating means
Definitions
- the present invention relates to a steam generator and a heating cooker, and more particularly, to a steam generator and a heating cooker capable of performing cooking using steam.
- Patent Document 1 Japanese Patent Laid-Open No. 2004-176743
- Patent Document 2 Japanese Patent Laid-Open No. 2013-124838 disclose a heating device using steam.
- the heating device of Patent Document 1 controls water supply to the steam generation unit based on temperature information from a temperature detection unit provided in the steam generation unit. Further, in Patent Document 2, the heating device supplies water from a water supply tank to the steam generation device by a water supply pump in order to generate steam.
- Patent Document 1 water is detected based on the temperature detected by the steam generation unit.
- the detection temperature is constant when water is present, and water is detected by utilizing the property that the detection temperature increases when water is exhausted.
- Patent Document 1 Although the method using the detection temperature of Patent Document 1 can determine whether or not there is water, it is difficult to detect the water level of how much water is present inside the steam generation unit. Therefore, in Patent Document 1, when the heating is stopped based on the detected temperature, the water in the container may already be completely evaporated to be in a dry-up state. In this case, scale (mineral components of tap water, calcium carbonate, etc.) generated by evaporation tends to adhere to the inner wall of the container. When the amount of attached scale increases, the thermal efficiency decreases.
- scale mineral components of tap water, calcium carbonate, etc.
- an object of the present disclosure is to provide a steam generator and a heating cooker that can perform operation control of steam generation according to the amount of water in the steam generation unit.
- Another object of the present disclosure is to provide a cooking device that uses steam and has excellent usability.
- the steam generator includes a steam generator.
- a steam generation part has a housing which can store water, and a heating part for heating a housing in order to generate steam.
- the steam generator further includes a water level detection unit for detecting a water level in the housing, a water supply unit for supplying water into the housing, a control unit for controlling the heating unit and the water supply unit, Is provided.
- the control unit includes a determination unit that determines whether or not the water level detected by the water level detection unit exceeds a threshold value. The control unit determines that the detected water level does not exceed the threshold value, and thereafter, when the time determined to not exceed the first time period continues, the water supply unit starts the supply of water into the housing.
- the heating unit is controlled to stop the heating of the housing when the time determined to not exceed and for a second time longer than the first time continues.
- the length of the second time indicates the length of time required for the water level stored in the housing to change from a threshold value to a predetermined residual water level due to evaporation.
- control unit when it is determined that the detected water level exceeds the threshold, the control unit further causes the heating unit to start heating the housing when the time determined to exceed exceeds a third time.
- the water supply unit is configured to stop the supply of water into the housing when the time determined to be controlled and exceeded for a fourth time longer than the third time continues.
- the steam generator further includes a temperature detection unit that detects the temperature in the housing.
- a steam generator changes the length of the water supply time by a water supply part based on the temperature detected by the temperature detection part.
- the length of the water supply time when the detected temperature is equal to or higher than a predetermined temperature is longer than the length of the water supply time when the detected temperature is lower than the temperature.
- the steam generator further includes a water tank for containing water.
- the water supply unit has a pump for circulating water between the water tank and the inside of the housing.
- the control unit controls the pump so as to continue the supply operation of sending water from the water tank into the housing for a predetermined time from the start of water supply into the housing, or stops heating by the heating unit. If the determination unit determines that the detected water level does not exceed the threshold when the pump is controlled so as to continue the supply operation for a predetermined time from the time, it is determined that there is no water in the water tank. Composed.
- control unit controls the pump so as to send water in the housing to the water tank.
- the water level detection unit has an electrode that can be immersed in the water of the housing.
- a water level detection part detects the water level in a housing by conduction
- the cooking device provided with the steam generator described above further includes a food storage chamber.
- the heating cooker is configured to supply steam from the steam generator into the accommodation chamber.
- the heating cooker includes a storage room for storing food and a steam generation unit.
- a steam generation part has a housing which can store water, and a heating part for heating a housing in order to generate steam.
- the heating cooker further includes a drainage unit for draining the water in the housing, and a control unit that controls the heating cooker.
- the control unit is configured to control the drainage unit so that drainage is started during steam cooking when steam cooking is performed to supply steam from the steam generation unit into the storage chamber.
- control unit controls the drainage unit so that the drainage is started at a time when the storage chamber is not overheated when the drainage is started and the drainage is continued until the end of cooking during steam cooking. It is configured as follows.
- the cooking device further includes a water tank for storing water, and a flow path unit for circulating water between the water tank and the housing.
- a water tank for storing water
- a flow path unit for circulating water between the water tank and the housing.
- the drainage part is provided in the flow path part.
- the drainage unit includes a pump for circulating water between the water tank and the housing.
- the control unit controls the pump so that the water in the housing is sent to the water tank when the remaining time until the end of steam cooking reaches the required time.
- control unit controls the pump so that the water in the water tank is sent into the housing through the flow path unit.
- FIG. 3 is a diagram illustrating a functional configuration and stored contents according to the first embodiment. 3 is a process flowchart relating to control of water supply and heating to the steam generator according to Embodiment 1; 3 is a timing chart regarding water supply and heating control according to the first embodiment. 3 is a timing chart regarding water supply and heating control according to the first embodiment.
- FIG. 3 is a timing chart regarding water supply and heating control according to the first embodiment. It is a figure which shows typically the signal waveform at the time of the normal driving
- FIG. It is a figure which shows typically the signal waveform in the case of stopping heating by detection temperature at the time of water supply abnormality. It is a figure which shows typically the signal waveform in the case of stopping heating by the detection water level at the time of the water supply abnormality which concerns on Embodiment 1.
- FIG. 6 is a timing chart for explaining water supply control according to Embodiment 2.
- 10 is a timing chart regarding water supply and heating control according to the third embodiment. It is a process flowchart regarding the waste_water
- the left side refers to the left side toward the cooking device when the cooking device is viewed from the door side
- the right side refers to the cooking device when the cooking device is viewed from the door side. Point to the right side.
- FIG. 1 is a schematic front view of the heating cooker according to Embodiment 1 when the door is closed.
- FIG. 2 is a schematic front view when the door of the cooking device of FIG. 1 is opened.
- the cooking device includes a rectangular parallelepiped casing 1, a heating chamber 2 provided in the casing 1 and having an opening 2a on the front side, and a door 3 for opening and closing the opening 2a of the heating chamber 2.
- a magnetron 4 shown in FIG. 4) for supplying microwaves to the heating chamber 2.
- the heating chamber 2 is an example of a “accommodating room” for accommodating foods to be cooked.
- An exhaust duct 5 is provided at the rear of the upper surface of the casing 1.
- a dew receptacle 6 is detachably attached to the lower part of the front surface of the casing 1.
- the dew receptacle 6 is located below the door 3 and is provided so as to receive water droplets from the rear surface of the door 3.
- a water supply tank 26 described later is detachably attached to the lower part of the front surface of the casing 1.
- the water supply tank 26 stores water for generating steam, which will be described later.
- the lower part of the door 3 is rotatably attached to the front surface of the casing 1.
- a transparent outer glass 7 having heat resistance is provided on the front surface of the door 3 (the surface opposite to the heating chamber 2).
- the door 3 has a handle 8 positioned above the outer glass 7 and an operation panel 9 provided on the right side of the outer glass 7.
- the operation panel 9 has a color liquid crystal display unit 10 for displaying various information and a button group 11.
- the button group 11 includes a cancel key 12 that is operated when heating is stopped halfway, a start key 13 that is operated when heating is started, menu keys for designating various cooking modes, and the like.
- the operation panel 9 is provided with an infrared light receiving unit 14 that receives infrared rays from a smartphone or the like.
- the operation panel 9 is an example of an “operation unit” for accepting a user operation on the cooking device.
- FIG. 2 schematically shows the inside of the heating chamber 2 with the door 3 opened.
- air outlets 29, 30, 31, 37 and the like for sending steam into the cabinet are arranged.
- An air inlet 27 is also provided. Details of these will be described later.
- FIG. 3 schematically shows the configuration of the main part of the heating cooker.
- the heating chamber 2 is shown as viewed from the left side.
- the heating cooker includes a circulation duct 18, an upper heater 20, an intermediate heater 21, a lower heater 22, a circulation damper 23, a steam generator 24, a tube pump 25, and a detachable water supply tank 26.
- Each of the upper heater 20, the middle heater 21, and the lower heater 22 is a sheathed heater, for example.
- the upper part 2e of the heating chamber 2 is connected to the rear part 2d of the heating chamber 2 through an inclined portion 2f.
- a plurality of suction ports 27 are provided in the inclined portion 2 f so as to face the circulation fan 19.
- a plurality of upper outlets 28 are provided in the upper part 2 e of the heating chamber 2.
- the blower outlets 29, 30 and 31 are provided in the rear part 2d of the heating chamber 2, respectively.
- Cooking trays 91 and 92 are accommodated in the heating chamber 2.
- the cooking trays 91 and 92 are used for placing foods to be cooked.
- the placed foods are discharged from the outlets 29, 30, and 31. It is set at a position where steam can be delivered.
- the circulation duct 18 is provided outside the heating chamber 2 and communicates with the inside of the heating chamber 2 through a suction port 27 and air outlets 28 to 31.
- a circulation fan unit 80 having a circulation fan 19 is provided for convection of air, saturated steam, and the like (hereinafter referred to as “air”) in the heating chamber 2.
- the “air etc.” is an example of a heat medium for cooking.
- the upper heater 20 heats the air flowing to the outlet 28.
- the middle heater 21 heats air or the like from the circulation fan 19 toward the upper heater 20, and heats air or the like from the circulation fan 19 toward the lower heater 22.
- the lower heater 22 is disposed in the circulation duct 18 and heats air flowing to the outlets 30 and 31.
- the steam generator 24 is an example of a “steam generator”.
- the steam generator 24 includes a metal container 32 having an open upper end, a resin lid 33 that closes the opening, and a steam generating heater 34 (hereinafter referred to as a heater) that is cast into the bottom of the container 32 and includes a sheathed heater. 34) and an in-housing temperature sensor 70 for detecting the temperature in the container 32.
- Water from the water supply tank 26 is stored on the bottom of the container 32, and the heater 34 heats the stored water through the bottom of the container 32.
- the saturated steam generated by heating flows through the resin steam tube 35 and the metal steam pipe 36 and is supplied into the connection portion of the circulation duct 18.
- the saturated steam blown out from the steam pipe 36 or the saturated steam in the heating chamber 2 is sent to the upper heater 20, the middle heater 21, and the lower heater 22 by the circulation fan 19. These heaters can heat saturated steam and raise the temperature of the steam to 100 ° C. or higher.
- a water level sensor 38 including a pair of electrode bars 39A and 39B is attached to the lid 33.
- the electrode rods 39A and 39B are attached so as to be immersed in the stored water in the container 32. It is detected from the output of the water level sensor 38 whether or not the two electrodes are in a conductive state due to immersion. Based on this detection, it is determined whether or not the water level on the bottom of the container 32 is a predetermined water level.
- the water level sensor 38 is an example of a “water level detection unit” for detecting the water level in the container 32.
- the container 32 is an example of a “housing” capable of storing water.
- the heater 34 is an example of a “heating unit” for heating the housing.
- the housing internal temperature sensor 70 is an example of a “temperature detection unit” for detecting the temperature in the container 32.
- the tube pump 25 is an example of a “pump” for circulating water between the steam generator 24 and the water supply tank 26.
- the heating cooker includes a water supply / drainage tube 40 which is an example of a “flow path unit” for circulating water between the water supply tank 26 and the container 32.
- the tube pump 25 squeezes the water in the water supply tank 26 by squeezing the elastically deformable water supply / drainage tube 40 made of silicon rubber or the like with a roller (not shown) and rotating in one direction. Flow to generator 24. Further, the tube pump 25 rotates the water in the container 32 to the water supply tank 26 by rotating in the direction opposite to the one direction.
- the heating cooker according to Embodiment 1 includes a drainage unit for draining the water in the container 32.
- the drainage unit includes the tube pump 25 described above.
- the water supply tank 26 has a water supply tank body 41 and a communication pipe 42.
- One end of the communication pipe 42 is located in the water supply tank body 41, and the other end is located outside the water supply tank 26.
- the other end of the communication pipe 42 is connected to the water supply / drainage tube 40 via the tank joint part 44. That is, the interior of the water supply tank body 41 communicates with the interior of the steam generator 24 via the communication pipe 42 and the like.
- FIG. 4 is a control block diagram of the heating cooker according to the first embodiment.
- the cooking device includes a control device 100 including an input / output circuit that inputs and outputs signals between a microcomputer and an external circuit on a circuit board (not shown).
- the control device 100 includes an upper heater 20, an intermediate heater 21, a lower heater 22, a steam generating heater 34, a circulation fan motor 56, an exhaust fan motor 57, an air supply fan motor 58, a circulation damper motor 59, an exhaust gas.
- the damper motor 60, the supply damper motor 61, the operation panel 9, the steam sensor 53, the water level sensor 38, the tube pump 25, the magnetron 4, the in-housing temperature sensor 70, and the like are connected.
- control device 100 controls various heaters and various motors, the tube pump 25, and the like based on signals from the operation panel 9, the steam sensor 53, the water level sensor 38, the in-housing temperature sensor 70, and the like.
- the control device 100 includes a timer 1C, a CPU (Central Processing Unit) 1A, and a storage unit 1B including a volatile or nonvolatile memory and various registers.
- a timer 1C a timer 1C
- a CPU Central Processing Unit
- storage unit 1B including a volatile or nonvolatile memory and various registers.
- FIG. 5 shows a functional configuration and stored contents of the heating cooker according to the first embodiment.
- CPU 1 ⁇ / b> A is an example of a “control unit” that controls a heating unit including heater 34 and a water supply unit including tube pump 25.
- CPU 1A is a tube control unit for supplying water to counter control unit 2A for controlling a counter, which will be described later, so as to perform a counting operation in synchronization with the time of timer 1C, and to steam generator 24.
- 25 includes a water supply control unit 2 ⁇ / b> B that controls 25 and a heating control unit 2 ⁇ / b> C that controls the heater 34.
- Each of these units is stored in advance in the storage unit 1B as a program. The function of each unit is realized by the CPU 1A reading and executing these programs. Note that these units may be realized by a combination of a program and a circuit.
- storage unit 1B includes an area E1 for storing pump counter 3A and heater counter 3B, and an area E2 for storing threshold values ⁇ , ⁇ 1, ⁇ , and ⁇ 1.
- the threshold values ⁇ , ⁇ 1, ⁇ , and ⁇ 1 correspond to control parameters for controlling the heater 34 for heating and the tube pump 25 for water supply, respectively.
- the pump counter 3A is controlled to count up to measure the length of time related to the operation or stop of the tube pump 25 for supplying water to the container 32.
- the heater counter 3B is controlled to count up in order to measure the length of time related to the heating operation in the container 32 by the heater 34.
- the pump counter 3A and the heater counter 3B are realized using, for example, a register of the storage unit 1B, but the implementation method is not limited to this.
- the threshold values ⁇ , ⁇ 1, ⁇ , and ⁇ 1 are values that are compared with the count values of the pump counter 3A and the heater counter 3B in the region E1, and are used to determine the time (period) related to heating or the time (period) related to water supply. To be referenced. Details regarding the threshold values ⁇ , ⁇ 1, ⁇ , and ⁇ 1 will be described later.
- FIG. 6 is a process flowchart regarding water supply and heating control according to Embodiment 1 of the present invention.
- This flowchart is stored in advance in the storage unit 1B as a program.
- the CPU 1A reads the program from the storage unit 1B, and executes the read program to realize the processing.
- 7 to 8 show timing charts related to water supply and heating control according to Embodiment 1 of the present invention. 7 to 8 show the elapsed time on the horizontal axis, and in the direction of the vertical axis, the presence or absence of the water level in the container 32 in relation to the elapsed time, the ON (operation) or OFF (stop) of the tube pump 25, And a signal indicating ON (heating) or OFF (heating stop) of the heater 34 is shown.
- the water supply control unit 2B controls the tube pump 25 by switching between supply of voltage to the tube pump 25 and supply stop. Specifically, the tube pump 25 rotates when a voltage is supplied, and the rotation operation acts to circulate water through the tube. Moreover, when the supply of voltage to the tube pump 25 stops, the rotation stops, and the flow of water also stops. Thus, supplying the voltage signal to the tube pump 25 by the water supply control unit 2B is referred to as “pump ON”, and stopping supplying the voltage signal is referred to as “pump OFF”.
- the heating control unit 2C supplies current to the heater 34 by duty control.
- the heater 34 generates heat when current is supplied, and stops heating when the current supply is stopped.
- the heating controller 2C supplying a current signal to the heater 34 is referred to as “heater ON”, and stopping the supply of the current signal is referred to as “heater OFF”.
- the threshold value TH shown below is the water level (reserved water level) from the bottom surface of the container 32 and indicates the water level at which the electrode rods 39A and 39B of the water level sensor 38 can be conducted.
- the determination unit of the CPU 1A determines that “there is water” based on the output of the water level sensor 38 in the conductive state, and “water” based on the output of the water level sensor 38 when the water level is less than the threshold TH in the non-conductive state. "None”.
- step S3 the normal operation (see FIG. 7) during the steam cooking mode (the heater 34 and the tube pump 25 are ON / OFF controlled) will be described.
- the CPU 1A determines whether or not “water present” changes to “water absent” based on the output of the water level sensor 38 (step S3). If this change is not determined (NO in step S3), step S3 is repeated.
- step S3 If it is determined that there is a change from “with water” to “without water” (YES in step S3), the counter control unit 2A initializes the pump counter 3A and the heater counter 3B (for example, sets 0) (step S5). .
- step S7 it is determined whether or not the condition of (detected water level ⁇ threshold TH) is satisfied. If it is determined that it is not established (NO in step S7), the process returns to step S3.
- the processing from step S9 described later is performed. Instead, normal ON / OFF control of the heater 34 and the tube pump 25 is performed.
- step S7 if it is determined that the condition of (detected water level ⁇ threshold TH) is satisfied (YES in step S7), it is determined as “no water”, that is, the water level is not recovered. In order to increase, more specifically, ON / OFF control for recovering the detected water level to the threshold value TH is performed.
- the counter control unit 2A starts counting up the pump counter 3A and the heater counter 3B (step S9). After the count-up starts, the count-up continues in synchronization with the timer 1C. Thereafter, the CPU 1A determines whether or not the condition (the count value of the pump counter 3A> the threshold value ⁇ ) is satisfied (step S11). If it is determined that the condition is not satisfied (NO in step S11), the process returns to step S7, and the subsequent processing is similarly repeated.
- the condition the count value of the pump counter 3A> the threshold value ⁇
- step S11 if it is determined that the condition is satisfied (YES in step S11), the water supply control unit 2B switches the tube pump 25 from “OFF control” to “ON control” (step S13). Then, it returns to step S3. Thereby, the supply of water from the water supply tank 26 is started into the container 32 so that the water level of the container 32 is recovered.
- the threshold value ⁇ is a sufficiently short time, and is the length of time required to sufficiently absorb noise (including circuit noise) included in the output of the water level sensor 38 and obtain a stable detected water level. Equivalent to.
- the threshold value ⁇ is obtained in advance by experiments or the like.
- step S15 determines whether or not the condition (count value of the heater counter 3B> threshold value ⁇ ) is satisfied. If it is determined that the condition is not satisfied (NO in step S15), the process returns to step S7, and the subsequent processing is similarly repeated.
- the heating control unit 2C switches the heater 34 from “ON control” to “OFF control” (step S17). Then, it returns to step S3. Thereby, when the water level of the container 32 does not recover to the threshold value TH (the amount of water is small), the heating is stopped. As a result, the dry-up state can be avoided.
- the dry-up state refers to a dry state in which the container 32 has no stored water and scale can adhere to the inner wall of the container 32.
- the heating of the container 32 is stopped when the time determined that the detected water level does not exceed thereafter continues for the second time indicated by the threshold value ⁇ .
- the heater 34 is controlled. That is, in the normal operation shown in FIG. 7, since the water supply is normally performed by the ON control (water supply) of the tube pump 25, the water level of the container 32 can be recovered during the time t1 to t4. Therefore, during normal operation in which normal water supply is performed, switching of “ON control” ⁇ “OFF control” of the heater 34 by the heating control unit 2C is not performed. Therefore, steam generation can be continued stably.
- step S17 switching from “ON control” to “OFF control” of the heater 34 is performed (step S17).
- the heating by the heater 34 can be stopped to avoid the dry-up and prevent the scale from adhering.
- the threshold value ⁇ indicates the length of time required for the water level stored in the container 32 to change from the threshold value TH to a predetermined residual water level by evaporation.
- the threshold value TH is a water level corresponding to 25 to 30 ml
- the residual water level is a water level at which dry-up can be avoided, for example, a water level corresponding to 10 to 15 ml.
- step S23 the CPU 1A determines whether or not it changes from “without water” to “with water” based on the output of the water level sensor 38. Determination is made (step S23). If this change is not determined (NO in step S23), step S23 is repeated.
- the counter control unit 2A initializes the pump counter 3A and the heater counter 3B (for example, sets 0) (step S25). .
- step S27 based on the output of the water level sensor 38, it is determined whether the water level is sufficient, that is, whether the condition of (detected water level> threshold value TH) is satisfied (step S27). If it is determined that it is not established (NO in step S27), the process returns to step S23, and ON control of the tube pump 25 is performed. Thus, when the water level of the container 32 is not yet sufficient, the water supply by ON control of the tube pump 25 is implemented, without performing the process after step S29 mentioned later.
- step S27 if it is determined that the condition of (detected water level> threshold value TH) is satisfied (YES in step S27), the water level is recovered by the water supply, so that the water level of the container 32 is maintained at an appropriate amount. ON / OFF control for maintaining the threshold TH is performed.
- the counter control unit 2A controls the pump counter 3A and the heater counter 3B to start counting up (step S29).
- the CPU 1A determines whether or not the condition (count value of the heater counter 3B> threshold value ⁇ 1) is satisfied (step S35). If it is determined that the condition is not satisfied (NO in step S35), the process returns to step S27, and the subsequent processing is similarly repeated.
- step S35 if it is determined that the condition is satisfied (YES in step S35), the heating control unit 2C switches the heater 34 from “OFF control” to “ON control” (step S37). Then, it returns to step S3.
- step S31 determines whether or not a condition (count value of the pump counter 3A> threshold ⁇ 1) is satisfied. If it is determined that the condition is not satisfied (NO in step S31), the process returns to step S27, and the subsequent processing is similarly repeated.
- step S31 if it is determined that the condition is satisfied (YES in step S31), the water supply control unit 2B switches the tube pump 25 from “ON control” to “OFF control” (step S33). Thereafter, the process returns to step S23. Thereby, the water supply from the water supply tank 26 stops so that the water level of the container 32 may be maintained at an appropriate amount.
- the heater 34 starts to be turned on so as to start heating in the container 32, and the time when the detected water level is determined to exceed the threshold value TH is longer than the threshold value ⁇ 1 (third time).
- the tube pump 25 is controlled to be OFF so that the supply of water into the container 32 is stopped.
- the threshold value ⁇ 1 is a sufficiently short time and corresponds to the length of time required until a stable detected water level is obtained by sufficiently absorbing circuit noise included in the output of the water level sensor 38.
- the threshold value ⁇ 1 is obtained in advance through experiments or the like.
- heating can be started at an early stage, and steam can be stably supplied into the heating chamber 2.
- FIGS. 10 to 12 are data obtained by experiments, and are diagrams for explaining the ON / OFF control for the tube pump 25 and the heater 34 according to the first embodiment.
- the horizontal axis indicates the passage of time, the detected water level A of the water level sensor 38, the detected temperature B of the in-housing temperature sensor 70, the ON / OFF signal C of the tube pump 25, and the heater 34 along the vertical axis.
- ON / OFF signal D and a change in the amount of water E in the container 32 are schematically shown. The control according to the embodiment will be further described with reference to FIGS.
- water supply control unit 2B controls tube pump 25 to be ON.
- the heater 34 can be always ON-controlled. As a result, steam can be generated stably.
- 11 and 12 show the operation when water supply is abnormal.
- the heater 34 when the heater 34 is controlled based on the detected temperature, the heater 34 stops after the detected temperature rises. Therefore, when the heater 34 is stopped, the container 32 may already be in a dry-up state, and scale adhesion cannot be avoided, resulting in a reduction in heating efficiency.
- the heater 34 is turned off at an early stage thereafter (at the time of the threshold value ⁇ ). It can. Thereby, the heater 34 can be OFF-controlled while leaving the amount of water that can avoid the dry-up state in the container 32. Therefore, scale adhesion as shown in FIG. 11 can be avoided and heating efficiency can be maintained.
- the time from when the water level is detected during water supply until the water supply is stopped is set to a different length. Specifically, the time is set to a different length between boiling (high water temperature) at which the water surface of the container 32 easily moves and low water temperature at which the water surface of the container 32 is almost stationary. Therefore, according to the water level control according to the present embodiment, hunting of the pump ON / OFF can be prevented and a stable water level can be maintained.
- FIG. 13 is a timing chart for explaining the water level control according to the second embodiment.
- the horizontal axis indicates the passage of time
- the vertical axis indicates the detected water level of the container 32 and ON / OFF of the tube pump 25 in association with each other.
- FIG. 13 shows a case where the temperature in the container 32 is 100 ° C. or higher, for example, when the steam cooking mode is in operation, and a case where the temperature in the container 32 is 100 ° C. or lower, for example, the initial water supply when the steam cooking mode is started. Is shown.
- the water supply control unit 2B controls the tube pump 25 to be ON / OFF so that the water level that can be determined as “water present” is maintained based on the threshold value TH. Therefore, it is necessary to accurately control the time from when the water level is detected when water is supplied into the container 32 until the water supply is stopped.
- the length of the water supply time by the ON control of the tube pump 25 is changed based on the temperature detected by the in-housing temperature sensor 70.
- the water supply control unit 2B sets the length of the water supply time X ⁇ 1 when the detected temperature is equal to or higher than a predetermined temperature (for example, 100 ° C.) to the water supply time Y ⁇ 1 when the detected temperature is lower than the temperature. Change to be longer.
- a predetermined temperature for example, 100 ° C.
- FIG. 14 is a timing chart for explaining the control according to the third embodiment.
- FIG. 14 shows the passage of time on the horizontal axis and the detected water level of the container 32, ON / OFF of the tube pump 25, and ON / OFF of the heater 34 on the vertical axis.
- the CPU 1 ⁇ / b> A has two timings for determining “no water” in the water supply tank 26.
- the second time is when the water supply operation is continued by the ON control of the tube pump 25 for a predetermined time (time Y ⁇ 2 in FIG. 14) from the OFF control (heating stop) of the heater 34. If it is determined that the detected water level has exceeded the threshold value TH at either the first timing or the second timing, it is determined that the water level has recovered, that is, the water supply tank 26 has water.
- the CPU 1A displays the determination result through the color liquid crystal display unit 10 or outputs it through an audio output unit (not shown). Thereby, it is possible to prompt the user to supply water to the water supply tank 26.
- the third embodiment it is possible to determine “no water” in the water supply tank 26 without providing a water level detection function of the water supply tank 26.
- the fourth embodiment shows a modification of the first to third embodiments.
- the CPU 1 ⁇ / b> A controls the tube pump 25 so as to send the water in the container 32 to the water supply tank 26.
- a tube pump is used to return water remaining in the container 32 (hereinafter also referred to as residual water) to the water supply tank 26 when cooking in the steaming mode is completed or when a predetermined time has elapsed since the completion. 25 is rotated in reverse.
- finish of the steaming cooking mode which remained in the container 32 can be discharged
- the discharge destination of the residual water in the container 32 is the water supply tank 26.
- the drainage path is not limited to this, and for example, a path for discharging to the dew receiver 6 side may be provided.
- FIG. 15 is a process flowchart relating to drainage control according to Embodiment 5 of the present invention. This flowchart is stored in advance in the storage unit 1B as a program.
- the CPU 1A reads the program from the storage unit 1B, and executes the read program to realize the processing.
- heating cooking using steam in a heating cooker (hereinafter referred to as steam cooking) can be performed, but every time steam cooking is performed, operation is performed to drain residual water in the container 32.
- the drainage unit is controlled so that drainage from the container 32 is started during steam cooking.
- the CPU 1A starts the process of draining the stored water in the container 32 and the water in the water supply / drainage tube 40 to the water supply tank 26 before the end of cooking so that drainage is completed at the end of steam cooking. Control the cooking device.
- the amount of water stored in the container 32 is constant (for example, about 50 milliliters) during steam cooking.
- CPU 1A determines whether or not the remaining time until the end of cooking is 1 minute based on the output of timer 1C (step S3). If it is not 1 minute (NO in step S3), the determination in step S3 is repeated.
- step S3 when it is determined that the remaining time is 1 minute (YES in step S3), the CPU 1A controls the heater 34 to be turned on (OFF) (step S5). As described above, when the remaining time becomes 1 minute, heating by the heater 34 is stopped. However, since there is a sufficient amount of water vapor in the heating chamber 2, even if the heating is stopped, the finish of cooking is affected. Is not enough.
- the CPU 1A controls the tube pump 25 to rotate in the opposite direction. Thereby, drainage into the water supply tank 26 of the stored water in the container 32 and the remaining water of the water supply / drainage tube 40 is started.
- the CPU 1A determines whether or not the drainage is finished (step S9). That is, based on the output of the timer 1C, the CPU 1A determines whether or not the drainage is completed based on whether or not one minute has elapsed since the drainage start. When it is not determined that the drainage is completed (NO in step S9), the process returns to step S7, but when it is determined that the drainage is completed (YES in step S9), the drainage is terminated. That is, the CPU 1A stops the tube pump 25. At this time, steam cooking is also terminated.
- the required time for draining the stored water in the container 32 and the remaining water in the water supply / drainage tube 40 is one minute, but is not limited to one minute. Further, the required time is more specifically required for draining all of the amount of water stored in the container 32 (the amount of water stored after the amount of water evaporated in the required time is deducted) and the remaining amount of water in the water supply / drainage tube 40. It is time, and can be acquired in advance by experiments or the like.
- drainage can be completed during steam cooking. Thereby, since it is not necessary to have the special time for drainage after completion
- the drainage treatment of FIG. 15 is not based on the method of draining the water in the container according to the siphon principle by adding water as in Patent Document 1. Therefore, since the user does not need to perform additional water supply for drainage to the water supply tank 26, the cooking device is excellent in convenience. Further, the water supply tank 26 does not need to have a large capacity capable of accommodating the amount of water for additional water supply.
- a detection unit is provided to determine whether or not the water supply tank 26 that is the drainage destination is attached to the heating cooker, and drainage is performed when it is detected that the water supply tank 26 is attached. Is done.
- the cooking device includes a hardware switch (not shown) in a portion where the water supply tank 26 is mounted. The hardware switch outputs an ON signal when the water supply tank 26 is attached, and outputs an OFF signal when it is not attached.
- the CPU 1A determines that the water supply tank 26 is removed (not installed) based on the output of the hardware switch, the CPU 1A notifies that fact without performing drainage. Specifically, a message for prompting the user to install the water supply tank 26 is displayed on the color liquid crystal display unit 10 for notification.
- the notification mode is not limited to message display.
- the CPU 1A may perform the drainage process after step S5 in FIG.
- FIG. 16 is a process flowchart relating to steam cooking control according to Embodiment 6 of the present invention. This flowchart is stored in advance in the storage unit 1B as a program.
- the CPU 1A reads the program from the storage unit 1B, and executes the read program to realize the processing.
- FIG. 17 is a diagram showing a table referred to in the processing of FIG.
- the table TB in FIG. 17 is stored in the storage unit 1B in advance.
- the contents of the table TB include information acquired by experiments or the like.
- table TB is determined to be “no water” at the time of initial water supply when steam cooking is started, corresponding to mode data M1 for identifying various steam cooking modes and each mode data M1.
- Control information M2 indicating the control content of the heating cooker at the time
- control information M3 indicating the control content when it is determined that “no water” during cooking after the initial water supply is stored.
- the mode data M1 varies depending on the combination of the type of cooking mode (steaming, soft steaming, light emission, etc.) and the input time (length of the set cooking time).
- the type of cooking mode is determined by the method of heating control (Duty ratio control) by the heater 34.
- “no water” is determined to indicate that there is no water for generating steam.
- This “no water” event includes the inability to supply water into the container 32 by the tube pump 25 and the absence of water in the water supply tank 26.
- the determination of “no water” is performed based on the output of the water level sensor 38. That is, when the stored water level from the bottom surface of the container 32 is equal to or higher than the threshold value TH, the electrode rods 39A and 39B of the water level sensor 38 are in a conductive state, and the determination unit of the CPU 1A determines that “water is present” from the output of the water level sensor 38. judge. On the other hand, when the stored water level in the container 32 is less than the threshold value TH and is in a non-conductive state, it is determined that there is no water based on the output of the water level sensor 38.
- the control content during steam cooking of the heating cooker is varied according to the timing at which the CPU 1 ⁇ / b> A determines “no water”. Specifically, if it is determined that “no water” is the initial water supply, the cooking device is controlled by the control information M2. Moreover, if it is time until completion
- the timer 1C starts counting time. Further, the CPU 1A operates the tube pump 25, for example, for 30 seconds so that water is supplied into the container 32 up to the water level of the threshold value TH. Thereby, the initial water supply into the container 32 is performed, and water can be stored up to the water level of the threshold value TH by the water supply for 30 seconds.
- CPU1A starts control of each part including the heater 34 according to the set mode after the above-mentioned initial water supply for 30 seconds. Thereby, steam cooking accompanied by heating by the heater 34 is started.
- CPU 1A repeatedly performs the process of FIG. 16 at sufficiently short intervals during initial water supply and during steam cooking.
- step S11 the CPU 1A determines whether or not “no water” based on the output of the water level sensor 38 (step S11). If it is not determined that “no water”, step S11 is repeated.
- the CPU 1A determines whether or not it is an initial water supply based on the output of the timer 1C (elapsed time from the start of steam cooking) (step S13). . When the output of the timer 1C indicates 30 seconds, it is determined that the initial water supply is in progress.
- CPU 1A determines that it is during initial water supply (YES in step S12), it searches table TB based on the above-described setting mode, reads control information M2 corresponding to the matching mode data M1, and reads the read control information M2. Each part is controlled based on this (step S15, S17). For example, the CPU 1A notifies the error by outputting an error message to the color liquid crystal display unit 10 (step S15), and then stops the tube pump 25 and the like to forcibly stop the steam cooking.
- initial water supply may be performed prior to the user's mode setting operation. In that case, that is, when the “no water” determination at the time of initial water supply is made at the time of mode setting, the CPU 1A forcibly performs steam cooking including the heating stop of the heater 34 after the heating by the heater 34 is started. Stop.
- CPU 1A determines whether to continue or stop steam cooking (step S19). That is, the CPU 1A searches the table TB based on the setting mode designated by the user described above, and reads the control information M3 corresponding to the mode data M1 of the setting mode from the table TB. Then, CPU 1A determines whether to continue or stop steam cooking based on the read control information and the output of timer 1C (elapsed time from the start of cooking). In this case, the control information M3 indicated by the arrow AR in FIG. 17 is read based on the user setting mode described above.
- step S15 and step S17 are performed in the same manner.
- the CPU 1A determines that the elapsed time is less than 3 minutes before the cooking end time (9 minutes 30 seconds) in the setting mode, that is, the CPU 1A determines that the elapsed time is longer than 6 minutes 30 seconds. Then, the control information M32 is read, and the steam cooking is continued according to the read control information M32 (“continue” in step S21). At this time, the CPU 1 ⁇ / b> A may stop the tube pump 25 and the heater 34.
- step S23 determines whether the cooking end time (9 minutes 30 seconds have elapsed from the start) is reached based on the output of the timer 1C (step S23). Until the cooking end time is reached (NO in step S23), step S23 is repeated. During the time in which the determination in step S23 is repeated, steam is not supplied from the steam generator 24, but cooking using the steam present in the heating chamber 2 can be performed.
- step S23 the CPU 1A controls each unit so as to end the steam cooking. Thereafter, the CPU 1A outputs the message indicated by the flag F of the control information M32 described above to the color liquid crystal display unit 10 (step S25). Thereafter, the process of FIG. 16 is terminated.
- the flag F is registered corresponding to a cooking mode that may affect the cooking finish when water is exhausted and steam cooking is continued.
- the message indicated by the flag F represents that cooking has been performed without supplying steam during a part of the set cooking time (for example, 3 minutes before the end of cooking). Further, the message may include the length of time during which steam has not been supplied.
- the user can confirm the cause of the poor finish by checking the message, and the cause of the poor finish is the cooking without supplying steam during part of the steam cooking time. Can be determined to have been implemented.
- the heating cooker includes a storage chamber (heating chamber 2) for storing food, a housing (container 32) capable of storing water, and a housing for generating steam.
- a steam generation unit having a heating unit (heater 34) for heating and a control unit (CPU 1A) for controlling the heating cooker.
- CPU 1A control unit
- the control unit may further vary the above control method for each steaming cooking mode.
- the above-described control method includes stopping steam generation from the steam generation unit.
- the control unit notifies the end of the steam cooking.
- This notification content may include information regarding the time when steam generation was stopped.
- the CPU 1A of the cooking device having the configuration shown in FIGS. 1 to 4 described above determines when the container 32 needs to be cleaned. That is, scale (mineral components of tap water, calcium carbonate, etc.) adheres to the inner wall of the container 32 of the steam generator 24. If the amount of attached scale increases, the attached scale becomes a heat insulating layer, and the heating efficiency by the heater 34 decreases. Therefore, it is desirable to clean the container 32 and remove the scale before the heating efficiency decreases.
- scale mineral components of tap water, calcium carbonate, etc.
- FIG. 18 is a graph referred to in order to determine the cleaning time according to the seventh embodiment of the present invention.
- the data of this graph is acquired by conducting an experiment in advance and stored in the storage unit 1B.
- the horizontal axis of the graph in FIG. 18 indicates the passage of time, and the vertical axis indicates the temperature of the container 32 of the steam generator 24. This temperature indicates the measured temperature of the container 32 based on the output of the temperature sensor 70 in the housing.
- graphs L1, L2, L3, and L4 show temperature changes until the start of boiling (start of evaporation) is detected when the amount of scale adhesion is varied.
- the scale deposition amount has a relationship of (L1 ⁇ L2 ⁇ L3 ⁇ L4), and the temperature at which the start of boiling is detected has a relationship of (T1 ⁇ T2 ⁇ T3 ⁇ T4).
- “cleaning notification temperature” indicated by a broken line in FIG. 18 is set as a reference temperature for cleaning the container 32.
- the CPU 1A determines that “there is water” based on the output of the water level sensor 38, and based on the output of the temperature sensor 70 in the housing, It is determined whether or not the above temperature is continuously detected for a predetermined time.
- the CPU 1A determines that a temperature equal to or higher than the “cleaning notification temperature” has been continuously detected for a predetermined time, the CPU 1A notifies a message for prompting cleaning of the container 32 at the end of steam cooking or thereafter. . For example, a message is displayed on the color liquid crystal display unit 10.
- a steam generation unit having a housing (container 32) capable of storing water, and a heating unit (heater 34) for heating the housing to generate steam, and the steam generation unit And a control unit (CPU1A) that controls the control unit, the control unit estimates the amount of adhesion of the scale from the characteristics of the temperature change of the housing, and determines whether the housing needs to be cleaned based on this estimation. Configured.
- control unit performs the above estimation and determination during the steam cooking, and notifies a message based on the determination result at the end of the steam cooking or after.
- the method of the seventh embodiment it is possible to determine and notify whether or not cleaning is necessary even if the hardness of the water used varies depending on the estimation based on the temperature characteristics of FIG. it can. Moreover, the situation where steam cooking is implemented in a state where the amount of evaporation is reduced can be avoided by cleaning the container 32 according to the notification.
- FIG. 19 is a process flowchart regarding the cleaning mode of the steam generating container according to Embodiment 8 of the present invention. This flowchart is stored in advance in the storage unit 1B as a program. The processing is realized by the CPU 1A reading the program from the storage unit 1B and executing the read program.
- FIG. 20 is a timing chart of the cleaning process according to the eighth embodiment of the present invention.
- FIG. 21 is a timing chart of the rinsing process according to the eighth embodiment of the present invention.
- the horizontal axis indicates the elapsed time
- the vertical axis indicates the change in the amount of water stored in the container 32 in relation to the elapsed time.
- the tube pump 25 is turned on (operating (one Direction B or rotation in the opposite direction)) or OFF (stop) change signal B, and heater 34 ON (heating) or OFF (heating stop) signal C.
- the data of FIG. 20 and FIG. 21 shows data obtained by the inventors' experiment.
- the CPU 1A when the user operates the operation panel 9 to designate the cleaning mode, the CPU 1A starts the cleaning mode process of FIG. 9 according to the operation content. For example, when the user confirms the “message for prompting cleaning of the container 32” described in the seventh embodiment, the user designates the cleaning mode.
- a cover is installed in the upper opening of the container 32 to close the container 32.
- cleaning liquid refers to an aqueous solution in which citric acid for neutralizing the scale is dissolved, but the neutralizing agent is not limited thereto.
- step S31 the cleaning process (step S31) will be described with reference to the timing chart of FIG.
- the user attaches a water supply tank 26 containing a sufficient amount of cleaning liquid to the cooking device.
- the cleaning process includes a water supply STAGE process, a subsequent SATGE (1) process, and a subsequent STAGE (2) process.
- the CPU 1A stops the heater 34 and controls the tube pump 25 to rotate in one direction. Accordingly, the cleaning liquid is supplied from the water supply tank 26 into the container 32 in a state where the heating of the container 32 is stopped.
- the CPU 1A determines that “there is water” based on the output from the water level sensor 38 after starting the water supply, the CPU 1A ends the water supply STAGE process and proceeds to the STAGE process (1). As a result, the cleaning liquid is supplied into the container 32 up to the water level of the threshold value TH.
- the STAGE process (1) is a process of immersing the cleaning liquid in the container 32 without boiling.
- the CPU 1A controls the tube pump 25 to rotate in one direction in order to additionally supply a predetermined amount of water.
- the CPU 1A acquires the amount of water supplied to the container 32 from the length of the rotation time of the tube pump 25.
- the CPU 1 ⁇ / b> A stops the tube pump 25.
- the CPU 1A performs heating by the heater 34.
- the heater 34 is intermittently ON / OFF controlled to heat the container 32.
- the CPU 1A turns on / off the heater 34 in accordance with a predetermined duty that maintains the temperature of the cleaning liquid in the container 32 at a predetermined temperature at which the cleaning liquid does not boil based on the output of the temperature sensor 70 in the housing. Control. Thereby, the washing
- the temperature for this heat retention is desirably a temperature for promoting the softening of the scale attached to the inner wall of the container 32 and the neutralizing action by citric acid.
- the CPU 1A turns off the heater 34 so as to stop heating the container 32. Further, the CPU 1A rotates the tube pump 25 in the opposite direction. Thereby, the cleaning liquid in the container 32 is discharged into the water supply tank 26. The CPU 1A acquires the amount of discharged water from the length of time for which the tube pump 25 is rotated. When the CPU 1A determines that the acquired amount of drainage has reached a predetermined amount, the CPU 1A stops the tube pump 25 in order to stop draining. By this drainage, the water level of the container 32 is lowered to a water level that does not bump even if it is boiled, and the STAGE (1) step ends.
- the stage (2) step is performed.
- the CPU 1A performs ON / OFF control of the heater 34 with a predetermined duty and raises the cleaning liquid in the container 32 to a temperature at which it boils based on the output of the in-housing temperature sensor 70.
- the tube pump 25 is intermittently rotated in one direction, and the process of intermittently adding the cleaning liquid from the water supply tank 26 into the container 32 is repeated.
- the additional amount of the cleaning liquid per one time is an amount of water for supplementing the amount of evaporation due to boiling. As a result, vibration (convection) occurs in the cleaning liquid in the container 32 due to boiling and addition of the cleaning liquid, and peeling of the scale attached to the inner wall surface in the container 32 is promoted.
- the CPU 1A determines that a predetermined time has elapsed since the start of the stage (2) process, the CPU 1A controls the heater 34 to be turned off to stop heating. Further, the tube pump 25 is rotated in the opposite direction, and the water is discharged from the container 32 into the water supply tank 26. When drainage in the container 32 is completed, the SATGE (2) step is terminated.
- the CPU 1A When the cleaning process shown in FIG. 20 is completed, the CPU 1A notifies the end of the cleaning process. For example, a “cleaning process completed” message is displayed on the color liquid crystal display unit 10.
- the user confirms the message, the user removes the water supply tank 26 and discards the cleaning liquid in the water supply tank 26 (the cleaning liquid after cleaning the container 32 in the cleaning process). Then, after a sufficient amount of water (for example, tap water) is accommodated in the water supply tank 26 for the subsequent rinsing process, the water supply tank 26 is attached to the heating cooker.
- a sufficient amount of water for example, tap water
- the CPU 1A When the CPU 1A detects that the water supply tank 26 is mounted based on the output from the hardware switch described above, the CPU 1A starts the rinsing process of FIG. 21 (see step S33 of FIG. 19).
- the rinsing process includes a water supply STAGE process, a subsequent SATGE (1) process, a subsequent STAGE (2) process, and a subsequent STAGE (3) process.
- the CPU 1A stops the heater 34 and controls the tube pump 25 to rotate in one direction. Thereby, water supply from the water supply tank 26 into the container 32 is performed in a state where the heating of the container 32 is stopped.
- the CPU 1A determines that “there is water” based on the output from the water level sensor 38 after starting the water supply, the CPU 1A ends the water supply STAGE process and proceeds to the STAGE process (1). Thereby, the inside of the container 32 will be in the state which water stored to the water level of said threshold value TH.
- the STAGE step (1) is a step of rinsing the inside by boiling the water in the container 32 at a water level that does not cause sudden boiling.
- the CPU 1A intermittently rotates the tube pump 25 in one direction, and additionally supplies a predetermined amount of water for each rotation, and the heater 34 is intermittently and according to a duty with a relatively long ON time. ON / OFF control is performed to heat the container 32.
- the stage (1) process is terminated.
- the heating operation by the duty is performed at the water level where no bumping occurs, and thereby the water surface in the container 32 vibrates.
- rinsing of the scale and citric acid remaining in the container 32 is performed.
- the rinsing in the container 32 is mainly promoted by setting the duty with a long ON time.
- the CPU 1A rotates the tube pump 25 in one direction to supply additional water into the container 32 in a predetermined amount.
- the additional water supply amount is an amount for making the water surface substantially the same height as the upper opening surface of the container 32.
- the CPU 1A sets the duty so that the ON time is shortened, and controls the heater 34 in accordance with the duty after the setting.
- the container 32 is heated by the heater 34 in accordance with the duty that does not cause bumping, and the water surface on the opening surface of the container 32 vibrates. This vibration can effectively carry out rinsing of the scale and citric acid adhering to the cover in the cleaning process.
- the stage (3) step is performed.
- the CPU 1A rotates the tube pump 25 in one direction so as to raise the water level in the container 32 to a water level exceeding the cover. This makes it possible to rinse the scale and citric acid remaining above the cover.
- the CPU 1A controls the tube pump 25 to rotate in the opposite direction, and discharges all the water in the container 32 into the water supply tank 26.
- the rinsing process is completed. In addition, you may repeat a rinse process in multiple times.
- the CPU 1A notifies the end of the cleaning mode. For example, the “cleaning mode end” message is displayed on the color liquid crystal display unit 10.
- the user confirms the message, the user removes the water supply tank 26 and discards the water in the water supply tank 26 (water after rinsing the container 32 in the rinsing step).
- the cleaning liquid stored in the water supply tank 26 is supplied into the container 32 (water supply STAGE step). And the process (STAGE (1) process) of heat-retaining at the 1st water level higher than normal operation (threshold value TH) and the temperature which is not boiled for a predetermined time (STAGE (1) process), and the next process are implemented.
- the cleaning liquid in the container 32 is drained until it changes to the second water level, and the heating liquid is boiled at a predetermined time ratio (Duty), and then the cleaning liquid for the evaporation amount is supplied into the container 32.
- the water level is maintained.
- the cleaning liquid in the container 32 is drained.
- normal water for example, tap water
- water supply STAGE process normal water (for example, tap water) in the water supply tank 26 is supplied into the container 32 (water supply STAGE process).
- the heating process is performed by the heater 34 at a predetermined time ratio (Duty) for each of the plurality of water levels, whereby the boiling process is repeated (STAGE (1) process, STAGE (2) process).
- STAGE (3) step for draining the water after rinsing in the container 32 is performed.
- a steam generation section having a housing (container 32) capable of storing water, and a heating section (heater 34) for heating the housing to generate steam, and the housing
- a steam generator including a water supply / drainage unit (tube pump 25) for water supply / drainage, a tank for storing water (water supply tank 26), and a control unit (CPU1A) for controlling each unit
- the control unit cleans the housing In the cleaning mode, the step of supplying the cleaning liquid in the tank to the first water level in the housing through the water supply / drainage unit, the step of keeping the cleaning liquid in the housing warm by the heating unit, and the cleaning liquid in the housing from the first water level
- the step of draining through the water supply / drainage unit so as to change to two water levels, the step of boiling the cleaning liquid in the housing by the heating unit, and the cleaning in the housing Configured to perform the step of draining the liquid.
- the control unit supplies water in the tank (water supply tank 26) into the housing via the water supply / drainage unit (tube pump 25), and the heating unit It is comprised so that the process of repeatedly boiling the water in an inside and the process of draining the water in a housing may be implemented.
- the control unit is configured to perform a rinse mode after the above-described cleaning mode. Further, the rinsing mode is performed a plurality of times.
- the cleaning process and the rinsing process are performed while heating the water (or cleaning liquid) in the container 32 at a temperature that does not cause bumping, so that the cleaning liquid or water is scattered to other parts.
- the cleaning for removing the scale of the container 32 can be performed without performing the cleaning.
- the cooking device may be configured with one of the above-described embodiments, or may be configured with two or more.
- 2A counter control unit 2B water supply control unit, 2C heating control unit, 3A pump counter, 3B heater counter, 9 operation panel, 24 steam generator, 25 tube pump, 26 water supply tank, 34 steam generation heater, 38 water level sensor, 39A, 39B electrode rod, 70 temperature sensor in housing, 100 control device.
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Abstract
Description
図1は、実施の形態1に係る加熱調理器の扉閉鎖時の概略正面図である。また、図2は、図1の加熱調理器の扉開放時の概略正面図である。加熱調理器は、図示されるように、直方体形状のケーシング1と、ケーシング1内に設けられ、前側に開口部2aを有する加熱庫2と、加熱庫2の開口部2aを開閉する扉3と、加熱庫2内にマイクロ波を供給するマグネトロン4(図4に示す)とを備えている。加熱庫2は、被調理対象の食材を収容するための「収容室」の一実施例である。
実施の形態2は、実施の形態1の変形例を示す。
実施の形態3では、実施の形態1または2の変形例を示す。本実施の形態では、水位センサ38に出力に基づく検出水位により、給水タンク26における「水無し」を判定する。図14は、実施の形態3に係る制御を説明するためのタイミングチャートである。図14は、横軸に時間経過を示し、縦軸に容器32の検出水位、チューブポンプ25のON/OFF、およびヒータ34のON/OFFを関連付けて示す。
実施の形態4は、実施の形態1~3の変形例を示す。実施の形態4では、CPU1Aは、容器32内の水を給水タンク26へ送出するように、チューブポンプ25を制御する。これにより、例えば、蒸しモードの調理終了時、または終了してから所定時間経過したときに容器32に残っている水(以下、残留水ともいう)を、給水タンク26に戻すために、チューブポンプ25を逆回転させる。これにより、容器32に残った蒸し調理モード終了時の、炭酸カルシウム濃度が比較的高い残留水を、給水タンク26側へ排出することができる。
図15は、本発明の実施の形態5に係る排水制御に関する処理フローチャートである。このフローチャートは、予めプログラムとして記憶部1Bに格納される。CPU1Aは、プログラムを記憶部1Bからプログラムを読出し、読み出されたプログラムを実行することにより処理が実現される。
実施の形態5では、排水先である給水タンク26が加熱調理器に装着されているか否かの検出部を設けて、給水タンク26が装着されていることが検出されたときに、排水が実施される。具体的には、加熱調理器は、給水タンク26が装着される部分にハードウェアスイッチ(図示せず)を備える。ハードウェアスイッチは、給水タンク26が装着されているときはON信号を出力し、未装着時にはOFF信号を出力する。
図16は、本発明の実施の形態6に係る蒸気調理の制御に関する処理フローチャートである。このフローチャートは、予めプログラムとして記憶部1Bに格納される。CPU1Aは、プログラムを記憶部1Bからプログラムを読出し、読み出されたプログラムを実行することにより処理が実現される。図17は、図16の処理において参照されるテーブルを示す図である。図17のテーブルTBは予め記憶部1Bに格納される。テーブルTBの内容は、実験等により取得される情報を含む。
上述の制御方法は、蒸気発生部からの蒸気発生の停止を含む。制御部は、蒸気調理を実施中に蒸気発生を停止させるように蒸気発生部を制御した場合には、蒸気調理の終了時にその旨を報知する。この報知内容は、蒸気発生を停止させた時間に関する情報を含んでよい。
実施の形態7では、上述した図1~図4に示す構成を備えた加熱調理器のCPU1Aは、容器32の洗浄が必要な時期を判定する。つまり、蒸気発生装置24の容器32の内壁には、スケール(水道水のミネラル成分、炭酸カルシウム等)が付着する。付着したスケール量が多くなると、付着スケールが断熱層となってヒータ34による加熱効率が低下する。したがって、加熱効率が低下する前に、容器32を洗浄してスケールを除去することが望ましい。
図19は、本発明の実施の形態8に係る蒸気発生容器の洗浄モードに関する処理フローチャートである。このフローチャートは、予めプログラムとして記憶部1Bに格納される。CPU1Aが、プログラムを記憶部1Bからプログラムを読出し、読み出されたプログラムを実行することにより処理が実現される。
Claims (12)
- 蒸気発生部を備え、
前記蒸気発生部は、水を貯留可能なハウジングと、蒸気を発生させるために前記ハウジングを加熱するための加熱部とを有し、
さらに、
前記ハウジング内の水位を検出するための水位検出部と、
前記ハウジング内に水を供給するための水供給部と、
前記加熱部および前記水供給部を制御するための制御部と、を備え、
前記制御部は、
前記水位検出部による検出水位が閾値を超えるか否かを判定する判定部を含み、
前記制御部は、
前記検出水位が前記閾値を超えないと判定され、その後、超えないと判定される時間が、第1の時間継続したとき、前記ハウジング内への水の供給を開始するように前記水供給部を制御し、且つ、
前記超えないと判定される時間が、前記第1の時間よりも長い第2の時間継続したとき、前記ハウジングの加熱を停止するように前記加熱部を制御するように構成される、蒸気発生装置。 - 前記第2の時間の長さは、前記ハウジング内に貯留される水位が、前記蒸発によって、前記閾値から予め定められた残留水位に変化するまでに要する時間の長さを示す、請求項1に記載の蒸気発生装置。
- 前記制御部は、さらに、
前記検出水位が前記閾値を超えると判定したとき、その後、前記超えると判定する時間が、前記第3の時間継続したとき、前記ハウジングの加熱を開始するように前記加熱部を制御し、且つ、
前記超えると判定する時間が、前記第3の時間よりも長い第4の時間継続したとき、前記ハウジング内への水の供給を停止するように前記水供給部を制御するように構成される、請求項1または2に記載の蒸気発生装置。 - 前記ハウジング内の温度を検出する温度検出部を、さらに備え、
前記水供給部による給水時間の長さを、前記温度検出部により検出された温度に基づき変化させる、請求項3に記載の蒸気発生装置。 - 前記検出された温度が予め定められた温度以上である場合の給水時間の長さは、当該温度未満である場合の給水時間の長さよりも長い、請求項4に記載の蒸気発生装置。
- 水を収容するための水タンクを、さらに備え、
前記水供給部は、前記水タンクと前記ハウジング内との間で水を流通させるためのポンプを有し、
前記制御部は、
前記ハウジング内への水の供給開始から予め定められた供給時間、前記水タンクの水を前記ハウジング内へ送出する供給運転を継続するように、前記ポンプを制御したとき、または、前記加熱部による加熱停止から予め定められた時間、前記供給運転を継続するように、前記ポンプを制御したとき、
前記判定部により、検出水位が前記閾値を超えないと判定されたときは、前記水タンクに水が無いと判定するよう構成される、請求項1から5のいずれか1項に記載の蒸気発生装置。 - 前記制御部は、
前記ハウジング内の水を前記水タンクへ送出するように、前記ポンプを制御する、請求項6に記載の蒸気発生装置。 - 加熱調理器であって、
食材を収容するための収容室と、
水を貯留可能なハウジングと、前記蒸気を発生させるためにハウジングを加熱するための加熱部とを有した蒸気発生部と、
前記ハウジング内の水を排水するための排水部と、
前記加熱調理器を制御する制御部と、を備え、
前記制御部は、
前記蒸気発生部からの蒸気を前記収容室内へ供給する蒸気調理を実施する場合に、蒸気調理中に、排水が開始されるように前記排水部を制御するよう構成される、加熱調理器。 - 前記制御部は、前記蒸気調理中に、排水を開始して調理終了まで排水を継続した場合に前記収容室が過加熱にならない時期に排水が開始されるように前記排水部を制御するよう構成される、請求項8に記載の加熱調理器。
- 前記加熱調理器は、
水を収容するための水タンクと、
前記水タンクと前記ハウジング内の間で水を流通させるための流路部と、をさらに備え、
前記制御部は、
前記蒸気調理の終了までの残り時間が、前記ハウジング内の貯水量および前記流路部の残水量を排水するための所要時間になったとき、前記ハウジング内の水を、前記流路部を介して水タンク内へ排水開始されるよう前記排水部を制御する、請求項8または請求項9に記載の加熱調理器。 - 前記排水部は、
前記流路部に設けられて、前記水タンクと前記ハウジング内との間で水を流通させるためのポンプを、含み、
前記制御部は、
前記蒸気調理の終了までの残り時間が、前記所要時間になったとき、前記ハウジング内の水を前記水タンクへ送出するように、前記ポンプを制御する、請求項10に記載の加熱調理器。 - 前記制御部は、
前記水タンクの水を、前記流路部を介して前記ハウジング内へ送出するように前記ポンプを制御する、請求項11に記載の加熱調理器。
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