CN85103083A - Apparatus for baking - Google Patents

Apparatus for baking Download PDF

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Publication number
CN85103083A
CN85103083A CN198585103083A CN85103083A CN85103083A CN 85103083 A CN85103083 A CN 85103083A CN 198585103083 A CN198585103083 A CN 198585103083A CN 85103083 A CN85103083 A CN 85103083A CN 85103083 A CN85103083 A CN 85103083A
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CN
China
Prior art keywords
food
heating
output
baking
heating cabinet
Prior art date
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Expired - Lifetime
Application number
CN198585103083A
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Chinese (zh)
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CN85103083B (en
Inventor
田道武士
藤川国义
安田隆俊
竹冈伸夫
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Sharp Corp
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Sharp Corp
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Publication date
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Priority to CN85103083A priority Critical patent/CN85103083B/en
Publication of CN85103083A publication Critical patent/CN85103083A/en
Publication of CN85103083B publication Critical patent/CN85103083B/en
Expired legal-status Critical Current

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  • Control Of High-Frequency Heating Circuits (AREA)

Abstract

A kind of method with heating is toasted and is placed on that the cooking of food therein device comprises in the heating cabinet: a detecting sensor that detects the cooking of food therein completion status; A food weight measurement mechanism of measuring the food weight of putting in the heating cabinet; A detector that detects the output variation of above-mentioned detecting sensor; One is used for comparison circuit that the output of the output of this detector and food and weight measurement sensor is compared; And the controller of heater work is controlled in output according to comparison circuit.

Description

Apparatus for baking
The present invention relates to a kind of apparatus for baking as microwave oven.
In common microwave oven,, can detect in heating cabinet gas or moisture by checkout gear by cooking food produced when when heating; Perhaps detect the surface temperature of institute's cooking food with infrared light detector; Perhaps detect the temperature of from heating cabinet, discharging gas by a thermistor; The baking state is detected.When the baking state reached the roasting food completion status of giving elder generation's regulation, induction heating equipment promptly was stopped.
In common technology, when not being put into the food that is toasted in the heating cabinet, if power supply is added on the magnetron that produces high frequency (this is called no-load condition), in heating cabinet, there are not this moment gas and moisture to produce, therefore, by detect from gas that cooking food produced and moisture with the microwave oven of judging roasting food and whether finishing in, heating will constantly be carried out.And then the temperature of apparatus for baking heating cabinet highly increases partly, will make apparatus for baking become abnormally dangerous.
In the microwave oven that contains infrared light detection device or thermistor, when not being put in the heating cabinet, heating and will constantly carry out in long-time at one by the food that toasted, up to the temperature in the heating cabinet be increased to give fixed high temperature till.Because heating cabinet is to be made by a kind of metal material of microwave reflection, therefore, compares with the temperature increase of food, the temperature increase of heating cabinet is seldom, because food is easy to the absorbing high-frequency signal, and has high dielectric constant.Therefore, heating will continue long time under non-loaded situation.
So wishing has an improved apparatus for baking, such as a microwave oven, whether it not only can detect the existence of food in heating cabinet; And, when not having food in the heating cabinet or only having small amounts of food, heating is only carried out the very short time.
Therefore, purpose of the present invention just provides a kind of improved apparatus for baking, and whether it not only can detect the existence of food in heating cabinet, and, when not having food in the heating cabinet or only small amounts of food being arranged, can make heating only continue a short time.
Another object of the present invention provides a kind of improved apparatus for baking, this device even also do not have the danger of heating when not having food or only small amounts of food being arranged in heating cabinet.
Other purposes of the present invention and further range of application will be apparent from from following detailed.Yet, will be appreciated that, when pointing out optimum implementation of the present invention, just provided the detailed description of object lesson by graphic method, and describe in detail according to this, the various variants and modifications that those skilled in the art are done within the spirit and scope of the present invention will be conspicuous.
In order to achieve the above object, according to optimum implementation of the present invention, toast by heater and to put the cooking of food therein device in the heating cabinet and comprise: detect by the checkout gear of the baking completion status of cooking food; Measure in the heating cabinet by the measurement mechanism of cooking food weight; Detect second checkout gear of the output variation of first checkout gear; The device that the output of the output of second checkout gear and measurement mechanism is compared; And the device of controlling the work of heater according to the output of this comparison means.
The output of finishing checkout gear when baking changes the value of determining earlier less than giving, and the food weight that records of Weight-measuring device is when giving fixed weight simultaneously at this, and the work of heater promptly is stopped.
Fig. 1 represents the front view of the microwave oven of optimum implementation of the present invention;
The cutaway view of Fig. 2 presentation graphs 1 microwave oven;
The circuit block diagram of Fig. 3 presentation graphs 1 and Fig. 2 microwave oven;
Fig. 4 is a curve chart, and it is used to illustrate the output level and the time relation of completion status checkout gear 12;
Fig. 5 is the flow chart of heating work that is used to illustrate the microwave oven of optimum implementation of the present invention.
By the diagram that following detailed description that provides and accompanying drawing provide, will understand the present invention better, and can therefore not be construed as limiting the invention.
Fig. 1 represents the front view of the microwave oven of optimum implementation according to the present invention.The cutaway view of Fig. 2 presentation graphs 1 microwave oven.Heating cabinet 4 is contained in the shell 1 of microwave oven.There is the guidance panel that adds hot key 3 to be contained in the antetheca of microwave oven shell 1.When pressing when adding hot key 3, the high-frequency signal that magnetron 5 is produced is passed to heating cabinet 4, and then, the food on carriage 6 is heated.Door 7 is contained in the front of shell 1, so that switch heating cabinet 4.In embodiments of the invention, " automatically " add hot key 8 and be contained on the guidance panel 2.When pressing " automatically " when adding hot key 8, magnetron 5 just is driven, thereby produces high frequency.
By the enter key on the guidance panel 2, manually imported relevant heating time or by after the baking information of weight of cooking food and so on, press and add hot key 3, promptly begin microwave heating.When only pressing " automatically " when adding hot key 8, baking information such as relevant heating time or food weight are read from memory, and carry out microwave heating according to these baking information.
When carrying out microwave heating, by drive fan 9 air is delivered to heating cabinet 4 from air intake 10, outside the gas of 4 li of heating cabinets is discharged to from air exit 11.
Baking is finished checkout gear 12(and is detected the gas of heat food generation and the transducer of moisture such as one; Or one according to by the surface temperature of cooking food to detect the transducer of infrared light; Perhaps detection is from the transducer of the temperature of the air-out of air exit 11) be installed in air exit 11 near.
Rotating shaft 13 is contained in the base plate centre of heating cabinet 4 basically, and is arranged on vertical direction.A upper end of rotating shaft 13 is connected to the cardinal principle centre of carriage 9 in removable mode.Rotating shaft 13 is rotatably being supported by bearing 14, and is inserted in the hole in the gear 15, thereby gear 15 is fixed in the rotating shaft 13.The gear 16 that is driven by motor 17 meshes with gear 15.When food was heated, carriage 6 was around rotating shaft 13 rotations, and like this, the inhomogeneous variation of food temperature has been avoided in the rotation of carriage 6.Carriage 6 also can move down along rotating shaft 13 when rotating in vertical direction.
Capacitive means 18 comprises that one can be gone up battery lead plate 19 and fixing battery lead plate 20 that rotates at pivot (folding pin).As shown in Figure 2, an end of the battery lead plate 19 that rotates on pivot is connected by a horizontal hinged joint pin 22, still can rotate on pivot after the connection, and the other end of the battery lead plate 19 that rotates on pivot is connected to spring 21, so that upwards lift rotor plate 19.The lower end of rotating shaft 13 contacts with the centre of rotating electrode plate 19.According to the food weight on carriage 6 that overcomes spring 21 pulling force, rotating polar plate 19 serves as the motion of axle in the vertical direction with horizontal hinged joint pin 22.Thereby, the angle between rotating electrode plate 19 and the fixed plate electrode 20 is changed, so just changed the electric capacity of capacitive means 18 along with the weight of food.
Fig. 3 represents the circuit block diagram of microwave oven illustrated in figures 1 and 2.Add hot key 3 or " automatically " when adding hot key 8 when pressing to be arranged on the guidance panel, this message from keyboard is sent to interface 23.By an A/D converter 24, the output of baking being finished checkout gear 12 is added to interface 23.The capacitive means 18 that weight according to cooking food on the carriage 6 is changed its electric capacity is connected to oscillating circuit 25.When the electric capacity of capacitive means 18 along with carriage 6 on during the weight change of food, the frequency of oscillation of oscillating circuit 25 just changes.Interface 23 is delivered in the output of oscillating circuit 25.Interface 23 connection processing circuit 26 are such as a microprocessor.Treatment circuit comprises a CPU 27(CPV), 28 and one of the read-only memorys (ROM) of a storage program and so on are used for the random memory (RAM) 29 of arithmetic operation and so on.The output of interface 23 is added to switching transistor 30, and this switching transistor is serially connected on the relay coil 32.When switching transistor 30 conductings, relay coil 32 is activated, thereby has connected relay switch 33.Around this principle the AC power from plug 34 is added to high-power generation transformer 35, so that excitation magnetron 5.In each constant time, count by the output pulse of 26 pairs of oscillating circuits 25 of treatment circuit.Therefore, can detect the frequency of oscillation of oscillating circuit 25 according to this count value.
With reference to figure 4, at time t 1Add hot key 8 and press adding hot key 3 or " automatically ".Along with adding pressing of hot key, motor 17 is driven, switching transistor 30 and relay switch 33 conductings, thus encouraged magnetron 5.When magnetron is energized, the food that is placed on the carriage in the heating cabinet 4 is begun heating.
Along with the carrying out of heating, the output that checkout gear 12 is finished in baking increases, as curve L 1Shown in.At t 2Constantly, reach predetermined value V when the output of finishing checkout gear 12 LThe time, then treatment circuit 26 is started working, stopcock transistor 30 and relay switch 33, thus stopped to the excitation of magnetron 5 with to the driving of motor 17.
Food is not being put under the situation of heating cabinet 4, added hot key 3 or " automatically " when adding hot key 8, driving motor 17 and encouraged magnetron 5 to heat when pressing.Yet, there are not gas and moisture from 4 li generations of heating cabinet, perhaps the temperature in the heating cabinet does not increase or does not increase significantly.Therefore, in a considerable time, the output of finishing checkout gear 12 is less than predetermined value V L, and be a constant, as line L 2Shown in.
In general, because the output of finishing checkout gear 12 is less than giving fixed value, magnetron 5 will constantly be encouraged.In order to address this problem, worked out the present invention.We will be described with reference to Figure 5 the work of microwave oven of the present invention.
Step n1:
Add hot key 8 and press adding hot key 3 or " automatically ", so that drive motor 17 and encourage magnetron 5.
Step n2:
Measure the food weight G of being put on the carriage 6 in the heating cabinet 4, this is to be finished by the frequency of oscillation that detects oscillating circuit 25 by treatment circuit 26, and this frequency is that the size with the electric capacity of capacitive means 18 changes.After having surveyed, weight G is deposited in the storage portions of random memory 29.
Step n3:
Switching transistor 30 and relay switch 33 conductings with excitation magnetron 5, thereby have been added to heating cabinet 4 to high frequency waveforms.Motor 17 is driven, and carriage 6 also rotates thereupon.
Step n4:
When the heating beginning, baking is finished the output voltage V of checkout gear 12 1Deposit in the storage portions of random memory 29.Clearly, we can select to finish from baking any other kinds of information of checkout gear 12.
Step n5:
After beginning heating, when carried out one give fixed during W 2The time, baking is finished the output voltage V of checkout gear 12 2Deposit in the storage portions of random memory 29.
Step n6:
Judge the first and second voltage (V 1And V 2) between difference whether greater than predetermined value △ V.
V 2-V 1＞△V……（1）
As the first and second voltage (V 1And V 2) difference be equal to or less than predetermined value △ V, then execution in step n7.
Step n7:
Judge that whether the food weight G that records previously is greater than predetermined value (for example about 100 grams).Give fixed gravimetric value if weight G is equal to or less than, then execution in step 8.Giving fixed gravimetric value can change according to apparatus for baking.
Step n8:
Judge on the carriage 6 of heating cabinet 4 and whether put food.
Step n9:
Switching transistor 30 and relay switch 33 turn-off, thereby have stopped the excitation to magnetron 5.Therefore high frequency produce stop after, i.e. execution in step n10 is so heating work stops.
As mentioned above, when not putting food in the heating cabinet 4 or only putting small amounts of food, it is unnecessary producing high frequency for a long time from magnetron 5.
At step n6, when satisfying formula (1), i.e. execution in step n11.
Step n11:
Detect the output that checkout gear 12 is finished in baking continuously.
Step n12:
Judge whether toast the output voltage of finishing checkout gear 12 has reached predetermined value V LIf having reached to give, the output voltage that checkout gear 12 is finished in baking decides magnitude of voltage V L, promptly stop step n 9, so that stop the work of magnetron 5.When the work of magnetron 5 stopped, n10 had finished cooking of food therein in step.
As the first and second output voltage (V 1And V 2) difference be equal to or less than predetermined value V LThe time, thereby this may be that what perhaps deposit in heating cabinet may be frozen food because a large amount of foods overlap together the gas that influenced the food of putting in heating cabinet 4 and the generation of moisture.In this case, execution in step n17 is to judge that whether the food of being put is greater than giving fixed weight.If the weight of food is greater than predetermined value, very slow even the variation of detection signal is finished in the baking of finishing checkout gear 12 from baking, heating is still constantly carried out.Constantly detect this magnitude of voltage at step n11, working then changes step n12 over to.
As mentioned above, stopped unnecessary heating when putting food or only putting small amounts of food, therefore microwave oven has been used safely when showing in the heating cabinet.
Be utilization to micro-wave oven although the present invention says, it all is suitable for various cookings for heating.
As mentioned above, according to the present invention, even when in heating cabinet, not putting food or only putting a small amount of food, the heating work that still apparatus for baking is suited, and eliminated unnecessary heating. So apparatus for baking any accident can not take place, thereby guaranteed the safe handling of apparatus for baking.
When not putting food in the heating cabinet or only putting a small amount of food, by the detection to the baking settling signal is combined with the measurement that is baked food weight, reduced heat time heating time, for example at about 20 minutes.
We have described the present invention, and clearly, the present invention may have the variation of various ways, but can not think that these variations have broken away from Spirit Essence of the present invention and scope, and are on the contrary, and all modifications all is believed to comprise among below the claim.

Claims (2)

1, a kind of method baking with heating is placed on that the cooking of food therein device comprises in the heating cabinet:
Detect first checkout gear whether cooking of food therein is finished;
Measure the measurement mechanism of the food weight of putting in the heating cabinet;
Detect second checkout gear of the output variation of first checkout gear;
Be used for device that the output of the output of second checkout gear and measurement mechanism is compared;
Control the device of heater work according to the output of comparison means.
2, the apparatus for baking of claim 1, the output of finishing checkout gear when baking change less than giving fixed value, and at the same time, the measured weight of Weight-measuring device when giving fixed weight, heater stop work wherein.
CN85103083A 1985-04-22 1985-04-22 Apparatus for baking Expired CN85103083B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN85103083A CN85103083B (en) 1985-04-22 1985-04-22 Apparatus for baking

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN85103083A CN85103083B (en) 1985-04-22 1985-04-22 Apparatus for baking

Publications (2)

Publication Number Publication Date
CN85103083A true CN85103083A (en) 1986-10-22
CN85103083B CN85103083B (en) 1988-10-26

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN85103083A Expired CN85103083B (en) 1985-04-22 1985-04-22 Apparatus for baking

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1050415C (en) * 1994-10-27 2000-03-15 Lg电子株式会社 Cooking arrangement with infrared sensor
CN102644951A (en) * 2011-02-22 2012-08-22 乐金电子(天津)电器有限公司 Barbecue tube control device and method
CN105222185A (en) * 2015-09-25 2016-01-06 广东美的厨房电器制造有限公司 The control method of micro-wave oven

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1050415C (en) * 1994-10-27 2000-03-15 Lg电子株式会社 Cooking arrangement with infrared sensor
CN102644951A (en) * 2011-02-22 2012-08-22 乐金电子(天津)电器有限公司 Barbecue tube control device and method
CN102644951B (en) * 2011-02-22 2016-06-29 乐金电子(天津)电器有限公司 The control device and method of barbecue tube
CN105222185A (en) * 2015-09-25 2016-01-06 广东美的厨房电器制造有限公司 The control method of micro-wave oven

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Publication number Publication date
CN85103083B (en) 1988-10-26

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