Classifications

• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
  • H05B6/00—Heating by electric, magnetic or electromagnetic fields
  • H05B6/64—Heating using microwaves
  • H05B6/642—Cooling of the microwave components and related air circulation systems
• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
  • H05B6/00—Heating by electric, magnetic or electromagnetic fields
  • H05B6/64—Heating using microwaves
  • H05B6/6447—Method of operation or details of the microwave heating apparatus related to the use of detectors or sensors
  • H05B6/6458—Method of operation or details of the microwave heating apparatus related to the use of detectors or sensors using humidity or vapor sensors

Definitions

• the present invention relates to an automatic heater, and more particularly to a heating cooker that automatically controls heating using sensor means that is sensitive to water vapor emitted from an object to be heated.
• conventional microwave ovens generally have a relative humidity detection sensor that is sensitive to water vapor coming out of the object 2 to be heated and that comes out of ⁇ . Since 12 is mounted in the heating chamber 1 or the exhaust duct 11 If used for a long period of time, splashes from the heated object 2, splashes of volatile substances, oily fumes, etc. will contaminate Sen 1-2, and the initial performance and sensitivity will be reduced during use. is there. Therefore sensor element 1 3 of the second 5 power sale to Coil Le heater 1 4 by FIG disposed near the periphery, immediately after the start cooking energized co I le Heater 1 4, the sensor element 1 3 Heating to more than 400 ° C to burn off adhering dirt. A cleaning method that always keeps good performance and sensitivity is considered. O has been used for electronic range, etc.
• the relative humidity change RH is detected from point D, and the output of magnetine sigma 3 is automatically controlled to control heating.
• FIG. 3d shows another conventional example. During the predetermined time t is then heated at a low power P L, Ru Te better expression of heating is switched to high output '.
• FIG. 3 e There is also a conventional example shown in Figure 3 e.
• This is a method that is a predetermined time 1 ⁇ time on, tau 2 hours after heating at intermittent operation off ⁇ 'switched to continuous operation at high power.
• the elements of the low outputs P l , t, t, 1 ⁇ , and ⁇ 2 need to be determined for the object 2 to be heated. That is, the output is determined so that a large amount of water vapor is emitted from the object 2 to be heated. But not, the energy absorption in the object to be heated 2 between from the start of cooking to t c - since a large amount of water vapor exceeds the predetermined level or more occurs, the conventional example shown in FIG. 3 c The time efficiency can only be improved to a degree.
• the present invention cleans the humidity sensor element within the time required from the input of the input signal of the start of cooking to the return of the humidity sensor means to the sensing state, and activates the heating means only for a predetermined time. Immediately before returning to the state where the humidity sensor means can be sensed, the heating output of the heating means is low or stopped immediately before the humidity sensor means returns to the sensing state, and the exhaust air containing the amount of water vapor or gas generated from the heated object is discharged. Or by forcibly discharging, or by temporarily bypassing the passage provided with the sensor means, and then increasing the heating output after the humidity sensor means returns to a sensible state. It is a heating cooker.
• the heating output is stopped or reduced immediately before returning to the detectable state. Since the output is used, the amount of generated steam or gas is reduced, and it is almost the same as the state immediately after the start of heating.After the sensor means returns to the sensible state, no heating is performed as before. It operates as if it were, and can accurately detect the heating status of the object to be heated. Therefore, in the past, only a small amount of heating could be performed so that a large amount of water vapor or gas was not generated before the sensor means returned to the sensing state, but with the above-described configuration, the cooking state could be accurately detected.
• FIG. 1 is a side sectional view of the heating cooker according to an embodiment of the present invention
• Figure 2 is an enlarged perspective view of a sensor portion of the vessel
• Figure 3 a ⁇ e is the traditional cooking device characteristic diagram showing changes and heating patterns of relative humidity
• embodiment a is the cooker of the water vapor amount characteristic diagram showing the change of the present invention
• Figure 4 b is FIG. 4 is a characteristic diagram showing a heating pattern of the same unit
• FIG. 4 d is a characteristic diagram showing a heating pattern in the third embodiment of the present invention
• FIG. 5 is a first embodiment of the present invention.
• FIG. 6 is another electric circuit diagram of the first embodiment
• FIG. 6 is another electric circuit diagram of the first embodiment
• FIG. 6 is another electric circuit diagram of the first embodiment
• FIG. 6 is an electric circuit diagram of the second embodiment
• FIGS. 8a and 8b are fourth embodiment of the present invention.
• Fig. 9a, ⁇ is a characteristic diagram showing changes in the heating pattern, the amount of water vapor, and the relative humidity of the cooking device in the example.
• reference numeral 1 denotes a heating chamber, which heats an object to be heated 2 with high-frequency energy oscillated from a magnetron 3.
• 4 is a fan motor], and cools the magnetron 3 and the like, and sends ventilation air into the heating room through the wind, duct 5 and air outlet 6.
• Exhaust air 9 containing steam 8 exiting the heated object 2 is discharged exhaust ports "1 0 through connexion exhaust duct 1 1.1 2 relative exhaust air 9 in sensor means for detecting the humidity Sensitivity to humidity.
• Figure 2 shows the relative humidity
• VvTPO — ⁇ Sensor means (hereinafter simply referred to as sensor) 1 Shows an enlarged version of 2 .
• 13 is a sensor element
• 14 is a coil heater provided near the periphery of the sensor element 13
• 15 is a support made of ceramic material ⁇ ) ⁇
• the heating was stopped at the same time high output cooking ⁇ until time t c which sensors 1 2 for detecting the heating and then the humidity returns to a steady state until the predetermined time t 2, after reaching the time t a Restart heating at high power again o
• That change in water vapor content of the heating chamber 1 ⁇ is up o cooking zone water vapor chi 0 of Hajimeji time t 2 to 3 cooking start is determined by the environment placed the microwave oven shown in Figure 4 a 15 amount of water vapor by the heating by the high output increases to x 2.
• the time t 2 or. Al Sen ⁇ 5 Sa 1 2 sensible state becomes time to t c is zero and output 3 ⁇ 4 Tsutei because, during this time is not generated steam, also the vapor in the heating chamber 1 is full By the motor 4), the gas is exhausted out of the heating chamber 1, and the amount of water vapor in the heating chamber 1 is equal to the initial water vapor amount z.
• FIG. 5 shows an embodiment of such an electric circuit.
• Reference numeral 16 denotes a commercial power supply
• reference numeral 17 denotes a contact inserted into the main circuit, which is turned on when cooking is started, and applies a voltage to the fan motor 4 .
• 1 9 high pressure door lance, 2 ⁇ high-pressure capacitor, 2 1 scan data Tsu crushed Saiichi Dodea, and has a positive power supply to the magnetic collected by filtration down 3.
• . 2 3 in contact of the high-pressure re one drill rate, anode voltage on-to magnetic preparative port down 3, Control This setup off City 3 ⁇ 40 2 2, including a microphone port computers in its co I le It is controlled by the nozzle 18.
• FIG. 6 shows another embodiment of the electric circuit.
• Reference numeral 25 denotes a relay
• reference numeral 24 denotes a coil thereof, which is controlled by a control opening part 18.
• the relay 25 and its coil 24 can also be implemented in a triac.
• FIG. 4C shows another embodiment.
• heating to a predetermined time the start of cooking at the same time as high power then sensor 1 2 performs heating at a low output until time to return to a steady state, heating is switched to high output after t c. Since the amount of water vapor generated from the heated object 2 is determined by the amount of heat applied to the heated object 2, As described in the above-mentioned embodiment of Fig. 4b, it is possible to return the low output Pi to the same environmental conditions as at the start of the preparation at t c , as described in the embodiment of Fig. 4b. You.
• FIG. 7 shows an electric circuit for realizing this embodiment.
• Reference numeral 28 denotes a power switching relay contact when the first high-voltage capacitor 20 and the second capacitor 26 are connected in parallel, so that the combined capacity is large and the magnetron 3
• the high frequency oscillated from is high output and ⁇ power when off.
• the second end is driven by a signal from the control unit 18 with the coil of the part relay.
• Fig. 4d shows still another embodiment.
• the electric circuit for realizing this embodiment is as shown in FIGS. 5 and 6 described above.
• Figure 8 a illustrates another embodiment et al of the present invention to b.
• reference numeral 1 denotes a heating chamber, which heats food 2 placed therein with high-frequency energy oscillated from a magnetron 3. 4 is over
• Exhaust duct 1 1 by the partition plate 2 9] -? It has been part divided into up and down. Sensor 1 2 is mounted on the upper portion of the exhaust duct 1 1, which is 2 minutes split part. The exhaust duct 11 and the blow duct are connected. A valve 30 is formed in the exhaust duct, and is driven by a solenoid 31 . The air blown to the sensor 12 is switched between the air from the blower duct and the exhaust from the heating chamber.
• valve 3 O is snapped to the position shown in Fig. 8a, and only the cooling air of the magnetron 3 is blown to the sensor 12 and the sensor 12 returns to the sensing state.
• the valve 3 O moves to the position shown in FIG. 8B, and only the exhaust gas from the heating chamber is blown to the sensor 12.
• the high-frequency energy is applied Remind as in FIG. 9 a, the status of generation of water vapor is the change in Figure 9 b, sensors 1.2 vicinity of the relative humidity are shown in Figure 9 0.
• Amount of steam by the heat from the cooking start to t c is increased to x 0 or et x c, contrast changes in relative humidity by the initial relative humidity RHQ to click rie two ring sensor 1 2 J?
• the relative humidity gradually decreases with the temperature rise of the exhaust air.
• the relative humidity R ⁇ ; ⁇ at the point where the rise of 5 ° C in relative humidity due to water vapor exceeds the temperature rise is set to the minimum value, and then the relative humidity HH increases due to a sudden increase in water vapor, and an increase in RH from R is detected. Control heating automatically.
• the following effects can be obtained in a microwave oven, an electric oven, and the like.

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• Physics & Mathematics (AREA)
• Electromagnetism (AREA)
• Electric Ovens (AREA)
• Control Of High-Frequency Heating Circuits (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=12079691

Family Applications (1)

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Citations (1)

• 1982
  • 1982-02-15 JP JP2233082A patent/JPS58140521A/ja active Granted
• 1983
  • 1983-01-31 WO PCT/JP1983/000028 patent/WO1983002818A1/ja unknown
  • 1983-01-31 AU AU11536/83A patent/AU549194B2/en not_active Ceased
  • 1983-02-11 CA CA000421488A patent/CA1212406A/en not_active Expired

Patent Citations (1)

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