CN1109850C - Microwave heater - Google Patents

Microwave heater Download PDF

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Publication number
CN1109850C
CN1109850C CN96194931A CN96194931A CN1109850C CN 1109850 C CN1109850 C CN 1109850C CN 96194931 A CN96194931 A CN 96194931A CN 96194931 A CN96194931 A CN 96194931A CN 1109850 C CN1109850 C CN 1109850C
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China
Prior art keywords
heating
microwave
food
temperature
steam
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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CN96194931A
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Chinese (zh)
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CN1188534A (en
Inventor
植田茂树
平井和美
森章子
稻田育弘
内山智美
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Publication date
Priority claimed from JP7155888A external-priority patent/JPH094848A/en
Priority claimed from JP15589095A external-priority patent/JP3633037B2/en
Priority claimed from JP15588995A external-priority patent/JP3477919B2/en
Priority claimed from JP15588795A external-priority patent/JP3579965B2/en
Priority claimed from JP15588695A external-priority patent/JPH094854A/en
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Publication of CN1188534A publication Critical patent/CN1188534A/en
Application granted granted Critical
Publication of CN1109850C publication Critical patent/CN1109850C/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24CDOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C7/00Stoves or ranges heated by electric energy
    • F24C7/08Arrangement or mounting of control or safety devices
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00Heating by electric, magnetic or electromagnetic fields
    • H05B6/64Heating using microwaves
    • H05B6/6426Aspects relating to the exterior of the microwave heating apparatus, e.g. metal casing, power cord
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00Heating by electric, magnetic or electromagnetic fields
    • H05B6/64Heating using microwaves
    • H05B6/6447Method of operation or details of the microwave heating apparatus related to the use of detectors or sensors
    • H05B6/6458Method of operation or details of the microwave heating apparatus related to the use of detectors or sensors using humidity or vapor sensors
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00Heating by electric, magnetic or electromagnetic fields
    • H05B6/64Heating using microwaves
    • H05B6/647Aspects related to microwave heating combined with other heating techniques
    • H05B6/6473Aspects related to microwave heating combined with other heating techniques combined with convection heating
    • H05B6/6479Aspects related to microwave heating combined with other heating techniques combined with convection heating using steam
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00Heating by electric, magnetic or electromagnetic fields
    • H05B6/64Heating using microwaves
    • H05B6/80Apparatus for specific applications
    • H05B6/802Apparatus for specific applications for heating fluids

Abstract

A microwave heater adapted to heat various kinds of materials while maintaining the good quality thereof by employing a means for controlling the environment in which the materials to be heated are placed. The heater has a structure provided with a heating chamber for holding a material to be heated therein, a microwave generating means for applying microwaves to the material to be heated, a vapor generating means for supplying vapor to the heating chamber, and a control means for controlling the microwave generating means and vapor generating means so that the temperature of the inner portion of the material being heated and that of the outer surface thereof substantially agree with each other.

Description

Microwave heating equipment
Technical field
The present invention relates to the microwave heating equipment that under suitable environment, multifarious heating object heated, nurses one's health.
Background technology
As everyone knows, as the technology formerly of existing microwave heating equipment, have a kind of at the above food defrosting formula cooking stove of 1980 No. 51541 communique of Japanese patent of invention bulletin.Below, describe with reference to Figure 23 with regard to its structure.
As shown in figure 23, have agitator 3 on the top board 2 of existing food defrosting formula cooking stove in sealing stove 1 freely, and be equipped with magnetron irradiation portion 4 in its vicinity.Having in stove 1 is the food rack 5 that takes off freely, but thereunder disposes the detachable liquid storage vessel 6 of putting into water, wet goods of infusion of food A, thereunder is provided with the heater 7 of coal gas, electric heating etc. again.By the combination of these magnetron irradiation portions 4 and liquid storage vessel 6 and heater 7, can utilize the heating that produces by the magnetron irradiation from the top, the steam heated that produces by boiled water from the below in the lump.
Adopt and utilize this magnetron irradiation and vapor heated structure in the lump, when the heats cold jelly food, the stagnation that produces the maximum ice crystallization generating zone that destroys the food cell film when thawing disappears, and, can realize not having the uneven heating of evenly thawing of thawing because of making it rapidly by seldom flowing out delicious composition herein.In addition, owing to produce steam, add multiplexer so also can be used as freezing bread, frozen confectionery class thaw, the ferment Bread and Cakes of whole operation of baking.
In addition, not only can produce steam heated, and can carry out various cookings according to multiple frozen food by steam.For example, following a kind of structure is disclosed: oil is put into the liquid storage vessel, the freezing cooked food of fried or Orly class is directly carried out oil to thaw, or pull down the liquid storage vessel, the hot blast that utilizes magnetron irradiation and heater to produce in the lump heats (stirring hot blast with the agitator on the top board), and frozen food thaws.
Yet in existing microwave heating equipment, the steam during owing to steam heated makes the environment in the heating clamber become the environment of about 100 degree of temperature, humidity about 100%, so the following drawback of generation.For example, because freezing bread after the baking or thawing of freezing Orly food of oil cooking back are adhered to steam from the teeth outwards, so food is clamminess and lacks delicate flavour.In addition, in the central and surperficial easily generation of food temperature inequality, wrap in quality, reduction fragrance and the elasticity of central destruction bread such as thawing or the problem that chewiness worsens with regard to few freezer surface so produced original water content.
Below, be elaborated with regard to this problem.Figure 24 is according to this existing heating using microwave and vapor heated and with temperature and the time dependent line chart of food temperature represented in the heating clamber that has concurrently.Owing to need very big energy from the food temperature of cryogenic temperature (20 ℃) beginning at maximum ice crystallization generating zone (1~-5 ℃), the time passes through herein a little while.Though food product refrigeration during absorb microwave not too easily, the microwave that penetrates to food inside is darker, and the heat conduction is also carried out fast.Therefore, the temperature in the food is more even.Here, though can accelerate by this maximum ice crystallization generating zone by utilizing steam in the lump, the temperature in the heating clamber becomes about 100 degree therefrom, and humidity also becomes about 100%.
Then, because of in a single day passing through this maximum ice crystallization generating zone, at the position that food inside just is mixed with the position after dissolving and is also freezing, the position after dissolving presents several times to tens times and absorbs microwave selectively in the dielectric loss at freezing position, so inner to produce heating uneven at food.Especially when steam heated owing to adhere to steam at food surface, on the top layer of food by heating using microwave, so surface temperature rises very easily again.That is, when the temperature of food central authorities reached the niciest suitable temperature, the surface was considerably beyond suitable temperature.
Here, yes that each food is inequality for the suitable temperature of food.For example, steam the occasion of dish, surpass 80 ℃, and the dish of Orly is a suitable temperature for 60~70 ℃, in case overheated, fried raw material are dehydration just, and moisture quilt cover clothing absorbs and becomes and be not very good eating.The suitable temperature of bread is normal temperature or the temperature higher slightly than body temperature, if too high raising temperature is then destroyed the quality of bread, reduces fragrance and elasticity or chewiness and worsens.Generally, suitable temperature is the following temperature of at least 90 degree.
In addition, each food of suitable humidity of food is also different.For example, the surfaces of tacky of the food of bread, Orly and so on just is not very good eating.
In this existing microwave heating equipment, only consider to pass through maximum ice crystallization generating zone how rapidly, except these main points, and do not consider under only condition, to heat, cooked food.That is, when steam heated, because the temperature in the heating clamber remains on about 100 degree of temperature, humidity is about 100%, so concerning food, just can not under only condition, heat, cook.
Summary of the invention:
For eliminating above-mentioned existing problem, the objective of the invention is to, provide a kind of and can carry out device cooking, that suitably the flow direction of environment, for example temperature, humidity and the wind of placing heating object etc. is controlled well multifarious heating object.
Microwave heating equipment of the present invention has: the heating clamber of placing heating object; With the microwave generating apparatus of microwave irradiation to described heating object; Steam is supplied to the steam generating device of described heating clamber; Input unit; And control device, it is characterized in that, described control device is controlled power supply to described microwave generating apparatus and described steam generating device according to the heating of input unit instruction, thereby the environment to described heating object is regulated, so that described heating object internal temperature is consistent with surface temperature.
Promptly in the invention that is disclosed, provide a kind of device that can regulate the environment of the heating object of placing food and so on, so that the proper temperature behind the food cooking, amount of moisture etc. roughly are adjusted to consistent with environment in the heating clamber.Thus, the surface temperature of food is the same substantially with internal temperature, absorbs superfluous heat and moisture in heating process from the food of heating object, and surplus supply just disappears, thereby realizes the cooking of optimum state.
In addition, for realizing better heating, in the present invention, make according to heating object to add the microwave output power pined for and change, and also the warm method of heating object is controlled.Therefore, make environment assimilation, finish heating, realize the less heating of moisture loss with proper temperature as the heating clamber of the food of heating object and adjusting.
In the present invention, can directly observe the environment of heating clamber, and its result can be fed back to control part again.Thus, can control the environment of heating clamber reliably.
Description of drawings:
Fig. 1 is the figure of the control method of the environment in the microwave heating equipment heating clamber among expression the 1st embodiment.
Fig. 2 is the outside drawing of microwave heating equipment of the present invention.
Fig. 3 is that the master of the microwave heating equipment of the present invention the 1st embodiment looks cutaway view.
Fig. 4 is the block diagram of the formation of microwave heating equipment control heating indoor environment among expression the 1st embodiment.
Fig. 5 is that the master of the microwave heating chamber of the 2nd embodiment looks cutaway view.
Fig. 6 is the figure of the control method of the environment in the microwave heating equipment heating clamber among expression the 3rd embodiment.
Fig. 7 is the figure of the control method of the environment in the microwave heating equipment heating clamber among expression the 4th embodiment.
Fig. 8 is that the master of the microwave heating chamber of the 3rd or the 4th embodiment looks cutaway view.
Fig. 9 is that the master of another microwave heating chamber of the 3rd or the 4th embodiment looks cutaway view.
Figure 10 is the block diagram of the formation of microwave heating equipment control heating indoor environment among expression the 3rd or the 4th embodiment.
Figure 11 is the figure of the control method of the environment in the microwave heating equipment heating clamber among expression the 5th embodiment.
Figure 12 is the figure of the control method of the environment in the microwave heating equipment heating clamber among expression the 6th embodiment.
Figure 13 is the figure of the control method of the environment in the microwave heating equipment heating clamber among expression the 7th embodiment.
Figure 14 is that the master of the microwave heating chamber of the 8th embodiment looks cutaway view.
Figure 15 is that the master of the microwave heating chamber of the 9th embodiment looks cutaway view.
Figure 16 is that the master of the microwave heating chamber of the 10th embodiment looks cutaway view.
Figure 17 is the figure of the control method of the environment in the microwave heating equipment heating clamber among expression the 10th embodiment.
Figure 18 is the figure of the control method of the environment in the microwave heating equipment heating clamber among expression the 11st embodiment.
Figure 19 is the figure of the control method of the environment in the microwave heating equipment heating clamber among expression the 12nd embodiment.
Figure 20 is the figure of the control method of the environment in the microwave heating equipment heating clamber among expression the 13rd embodiment.
Figure 21 is the figure of the control method of the environment in the microwave heating equipment heating clamber among expression the 14th embodiment.
Figure 22 is that the master of microwave heating equipment among the 15th embodiment looks cutaway view.
Figure 23 is that the master of the heating clamber of existing food defrosting formula cooking stove looks cutaway view.
Figure 24 is the figure of the control method of the interior environment of the heating clamber of existing food defrosting formula cooking stove.
The specific embodiment:
(embodiment 1)
Below, with reference to description of drawings the present invention the 1st embodiment.
Fig. 2 is the outside drawing about the heater of food heating method of the present invention.In the front of body 8, open and close and be supported with door leaf body 9 freely, to seal the opening of the heating clamber of placing food.On operation panel 10, is furnished with heating instruction key 11 as input unit, corresponding with the number of one digit number or a few figure place input with the factor that influences heatings such as food variety and component, storage temperature (freezing, cooling preservation etc.), temperature after heating, and make it send instruction to control part described later.At the right flank of body, be to take off to be equipped with supply flume 12 freely.
Fig. 3 is that the master of heating clamber looks cutaway view, is combined with magnetron 14 and the steam generator 15 that becomes steam generating device as the microwave generating apparatus of irradiating microwaves in heating clamber 13.Magnetron and described generator are by control part 21 controls that become control device.Operation principle for control part is narrated as the back.Steam generator 15 comprises boiler 16, has the atomizer 17 and the temperature regulating heater 18 of ultrasonic oscillator, atomizer 17 makes the water smoke that supplies to boiler 16 from supply flume 12 change into small water droplet and distributes, temperature regulating heater 18 after with this being atomized small water droplet heating and make it rise to desired temperature.Action control by atomizer 17 and the input of temperature regulating heater 18 control, steam generator 15 can produce have desired temperature, the air of desired humidity.Food 19 is placed on has the putting on the sundries ware 20 of multiple aperture or slit.
Fig. 4 is the block diagram that the expression control system constitutes, and becomes the control part 21 of the device that controls environment, and understands by the heating order number after 11 inputs of heating instruction key, reads from the memory 22 of memory storage the heating condition after specified.As heating condition, the control data of memory steam generator 15, that is, the data of the action control of memory representation atomizer 17 and the input of temperature regulating heater 18 control and expression are to the data of magnetron 14 conditions of power supply.These data are the controlling value of the time series data of each square frame also, or certain mathematical expression.Occasion in mathematical expression, control part 21 carries out computing and obtains time series data it, and follow this time series data and control power supply to atomizer 17 and temperature regulating heater 18, magnetron 14, along with the carrying out of heating, as predefined, control the temperature and humidity of the steam in the importing heating clamber 13 and the temperature of food.
Fig. 1 (a) is that expression the present invention adds the heating indoor temperature of pining for and the line chart of food temperature, (b) is the variation of the humidity in the expression heating clamber, (c) state of expression microwave output power.Characteristics of the present invention are, even in the occasion that makes steam generating device carry out work, and the environment in the heating clamber also not necessarily about 100 degree of temperature, humidity about 100% when steam heated.That is, because 21 pairs of microwave output powers of control part and steam generator control, so cooked food under only environment all the time.
Be described as follows for concrete heating means.(a) in, from the food temperature of cryogenic temperature (20 ℃) beginning slightly through after a while by (A constantly) maximum ice crystallization generating zone (1~-5 ℃).Begin to this moment A from heating, because food only absorbs microwave a little, and also good in the heat conduction of food inside, so shown in (c), microwave output power shines to frozen food with gross output preceding half, and the later half quilt that begins to dissolve on food products part ground suitably reduces.Between this frost free period, the temperature in the heating clamber is retained room temperature or high slightly, and humidity also is adjusted into normal wet or high slightly shown in (b).That is, thaw and mainly when food freezing, undertaken, suppress steam by being penetrated into dark especially heating using microwave.
Then, in case surpass A constantly, just food sharply absorbs microwave under the state at the position that is mixed with the position after dissolving and does not thaw.As narrating, because the position (moisture) after dissolving presents several times to tens times dielectric loss in freezing position, so shown in (c), make microwave output power be reduced to the part of gross output.In addition, as (a) and (b), temperature in the heating clamber and humidity begin to rise near described moment A or its.Here, the temperature in the heating clamber is controlled to that the temperature with the food that rises is roughly consistent along with the carrying out of heating.But because air thermal capacity is less, food is heated rapidly by microwave, so such as shown in the figure, when environment was controlled highly slightly, efficient was just fine.Because control part can be read control data with corresponding steam generator such as the kind of food and component, storage temperature (freezing, cooling preservation etc.), temperature after heating and magnetron by the number search memory of heating instruction key input, control at any time so can comply with it.In addition, for humidity, consider and thaw the back and just baked the humidity that good bread should contain, and supply with suitable steam from steam generating device.That is, not as existing microwave heating equipment, when steam heated, under the environment of about 100 degree of temperature, humidity about 100%, carry out the heating of food.
Utilize this control, the difference of the environment around food and the food is just small, and the exchange of temperature or humidity (moisture) is difficult to produce with regard to the utmost point.That is, because when the mean temperature of food central authorities reached proper temperature, environment became much the same temperature, so the transfer of the heat exchange on food top layer, moisture all is difficult to produce.Therefore, because the bread of a little higher than normal temperature of proper temperature or body temperature, inside and outside temperature difference is also little, so the quality of bread can not be damaged, can keep freezing preceding good fragrance and the elasticity of firm baking, and chewiness is good, can reappear firm ready-made local flavor.As a result, as shown in Figure 1, just can under the surface temperature of food and internal temperature state about equally, carry out cooking.
In addition, owing to considered the just roasting good contained amount of moisture of bread the humidity in the heating clamber is controlled at suitable humidity, so superfluous moisture can not contained because of steam in the surface of bread.
In addition, under the occasion of Orly food, when the fried raw material of inside reach 60~70 ℃,,, can keep the original flavor cooking so fried raw material moisture can not absorb by the quilt cover clothing because the face clothing also can reach roughly same temperature.
In addition, in the present embodiment, the influence because of steam after heating of the surface of bread, Orly based food is become damp slightly, but just dry in several minutes that are put on the dining table after heating.Through experiment repeatedly, after the heating, pass through a few minutes just than only using the drier of heating using microwave.This is estimated to be: the way after heating clamber takes out, because of making food be put into the indoor of dried low temperature, thus with regard to loses heat and moisture, and because of the small amount of moisture of this loss be attached to food in advance lip-deep, so after several minutes, flavour of food products approaches just ready-made.On the other hand, only using in the heating using microwave, in heating after after a while, the face clothing just produces large quantity of moisture.This is considered to, because fried raw material specific surface clothing temperature height, and fried raw-material water transport is to the face clothing, and so the face clothing just produces large quantity of moisture, fried raw material continuation is dewatered.
(embodiment 2)
Fig. 5 is that the master of the heating clamber of expression the 2nd embodiment looks cutaway view.In the 1st embodiment, disclosed by the heating means after input unit input and followed heating condition predetermined memory storage and the formation that heats, carried out the environment that checkout gear that instrumentation and the power supply of subtend steam generator feed back can be controlled at the food under the heated condition more accurately accurately and environment to heating clamber is set.That is, temperature sensor 23, humidity sensor 24 as environmental detection set are installed in heating clamber 13.Thereby temperature and the humidity that will measure in the heating clamber 13 are imported to control part 21.Control part 21 can accurately be held the environment in the heating clamber according to this data, and judges and whether can control, whether produce from now on deviation etc. by predetermined state.If the environment in the heating clamber departs from setting, the electric current that leads to steam generator 15 is changed and control and be returned to environment provided.
In addition, as present embodiment, be reliably though directly measure temperature and humidity, because the generating capacity of humidity can be held with importing roughly to the energising of steam generator, so, can roughly monitor the environment temperature of heating clamber by detecting the temperature of heating clamber at least.
(embodiment 3)
Then, the embodiment with air-supply arrangement is described.Fig. 8 represents to have the formation example of air-supply arrangement., behind cooling magnetron 14 parts such as grade, the regulation air quantity of guiding air guide body 26 is imported in the heating clamber 13 as the Air Blast fan 25 of air-supply arrangement.And behind should the ventilation wind agitating heating indoor inhomogeneous steam, exhaust outlet 28 rows that are provided with from the body part through exhaust guide way 27 and with the steam of surplus are external to this.
So, extraneous air is mixed with the air with desired temperature that steam generator 15 taken place, desired humidity, can more promptly on a large scale, adjust the environment in the heating clamber again by Air Blast fan 25.In addition, the wind that is flowed in the heating clamber is also controlled the drying regime of food surface easily.Be placed on as the food 19 of heating object and have the putting on the sundries ware 20 of many apertures or slit.
Fig. 9 is that the master of the heating clamber of another embodiment of expression looks cutaway view.In heating clamber 13, the Air Blast fan as air-supply arrangement is not set among Fig. 8 embodiment, and configuration cycles fan 29.The temperature and humidity of the air of being discharged by the steam generator after temperature adjustment, the damping 15 is more extensive promptly to be changed though circulating fan 29 can not make as Air Blast fan among Fig. 8 embodiment, but it is opposite, owing to can not make, can improve the uneven and humidity inequality of temperature by the indoor air of agitating heating in case temperature in the adjusted heating clamber 13 and humidity change.In addition, because of controlling its wind speed and air quantity, so control the drying regime of food surface easily.
Figure 10 is the block diagram that the expression control system constitutes, and control part 21 is understood from heating the heating order number after instruction key 11 is imported, and reads by the heating condition after specifying as the memory 22 of memory storage.As heating condition, the control data of memory steam generator 15, that is, the data of the input of the action control of memory representation atomizer 17 and temperature regulating heater 18 control and expression are to the data of magnetron 14 conditions of power supply and as the control data of the Air Blast fan 25 of air-supply arrangement.These data are the controlling value of the time series data of each square frame also, or certain mathematical expression.Control part 21 is followed the time series data after this storage or is followed certain mathematical expression is carried out computing and the time series data that obtains is controlled power supply and the Air Blast fan 25 to atomizer 17 and temperature regulating heater 18, magnetron 14, along with the carrying out of heating, be controlled to and reset temperature and humidity, the flow velocity of wind and the temperature of food that imports the steam in the heating clamber 13.
Fig. 6 is the embodiment that so constitutes.(a) expression adds temperature and the food temperature in the heating clamber of pining for, (b) variation of the humidity in the expression heating clamber, (c) state of expression microwave output power, (d) operating state of expression Air Blast fan.
(a) in, from the food temperature of cryogenic temperature (20 ℃) beginning slightly through after a while by (A constantly) maximum ice crystallization generating zone (1~-5 ℃).Begin to this moment A from heating, because food only absorbs microwave a little, and also good in the heat conduction of food inside, so shown in (c), microwave output power shines to frozen food with gross output preceding half, and the later half quilt that begins to dissolve at food products part suitably reduces.Between this frost free period, the temperature in the heating clamber is retained room temperature or high slightly, and humidity also is adjusted into normal temperature or high slightly shown in (b).That is, thaw and mainly when food freezing, bear, suppress steam by being penetrated into dark especially heating using microwave.
Then, in case surpass A constantly, just food sharply absorbs microwave under the state at the position that is mixed with the position after dissolving and does not thaw.As illustrated in the existing example, because the position (moisture) after dissolving presents several times to tens times dielectric loss in freezing position, so shown in (c), make microwave output power be reduced to the part of gross output.In addition, as (a) and (b), temperature in the heating clamber and humidity begin to rise from described moment A.But the temperature in the heating clamber is controlled to that the temperature with the food that rises is roughly consistent or high slightly along with the carrying out of heating.Because control part can be read control data with corresponding steam generator such as the kind of food and component, storage temperature (freezing, cooling preservation etc.), temperature after heating and magnetron and Air Blast fan by the number search memory of heating instruction key input, control at any time so also can comply with it.
Utilize this control, the difference of the environment around food and the food is just little, and the exchange of temperature or humidity (moisture) is difficult to produce with regard to the utmost point.That is, because when the mean temperature of food central authorities reached the moment B of proper temperature, environment became much the same temperature, so the transfer of the heat exchange on food top layer, moisture all is difficult to produce.Therefore, because the bread of a little higher than normal temperature of proper temperature or body temperature, inside and outside temperature difference is also little, so the quality of bread can not be damaged, can keep freezing preceding good fragrance and the elasticity of firm baking, and chewiness is good, can reappear firm ready-made local flavor.When the fried raw material of Orly food reached 60~70 ℃, the face clothing also was roughly same temperature, so fried raw material moisture can not absorb by the quilt cover clothing, can restore racily.
In addition, become damp because of the influence of steam slightly at moment B in the surface of bread and Orly food.Here shown in Fig. 6 (d), behind moment B, also continue to make the Air Blast fan action, then can make and distribute rapidly attached to the excessive moisture on the food surface.Therefore, in being necessary to make the crisp food of as the skin of the face clothing of Orly food or bread mouthfeel, behind moment B, the rotation that fan carried out several minutes is useful.
Through experiment repeatedly, in heating using microwave only, in heating after after a while, the face clothing just produces large quantity of moisture, and to the food after temperature adjustment, the damping heating since the fan idle running that moment B carries out several minutes, then can leave crisp sense.Be called " pectinid effect ".That is, only use microwave because fried raw material specific surface clothing temperature height, and since the fried raw-material water transport of moment B to the face clothing, so face clothing moisture is just many, on the other hand, because of fried raw material continue to dewater, so just be not very good eating.
In the present invention, in the time of " pectinid effect " behind described moment B, the minute quantity moisture that loses can be attached to the surface of food in advance, and after several minutes, flavour of food products also can approach just ready-made.
And the end of buzzer and so on is reported to the police and is carried out at moment C.The delay that this end is reported to the police also can be arranged on timer control part to counting since the stipulated time of moment B, the device that detects the heating indoor temperature also can be set drop to certain setting with the temperature that detects heating clamber.Like this, finish presignal delay to moment C by making, whether the user does not just worry food well-done, and relieved taking-up food is just passable although believe this end to report to the police.In addition, because the temperature and humidity in the heating clamber is low slightly, so safer when taking out food.
(embodiment 4)
Another embodiment of control method in the structure with air-supply arrangement is described.Fig. 7 represents to adjust the environment in the heating clamber so that be no more than the example that food heats temperature when finishing.
(a) be that expression the present invention adds the temperature in the heating clamber pined for and the line chart of food temperature, (b) be the variation of the humidity in the expression heating clamber, (c) state of expression microwave output power, (d) operating state of expression Air Blast fan.(a) in, beginning to its moment A from heating, is fully identical with above-mentioned the 1st control method.Shown in (c), cross constantly A after, the formation of part that microwave output power is reduced to gross output is also identical.In addition, (d) Air Blast fan shown in running intermittently behind moment B, and constitute to resemble with fan fan food wind is blown on the food off and on, can make " the pectinid effect " stated more remarkable.That is, in the occasion of blowing continuously, the surface temperature of food easily produces inequality, but because of intermittently blowing and utilizing the heat conduction in the food to make Temperature Distribution certain, so can carry out the uneven less cooking of temperature.
As (a) and (b), temperature in the heating clamber and humidity are since the rapid rising of moment A.But the proper temperature the when temperature in the heating clamber finishes with the food heating is roughly consistent, in fact is adjusted to higher slightly.Adopt this control,, can continue heating expeditiously because food is subjected to bigger temperature and humidity from the food surrounding environment than above-mentioned the 1st control method after through the moment A that finishes that thaws.But, because of environment never surpasses the proper temperature of its food, thus the low temperate zone of bread or Orly foodstuff or middle temperate zone, do not have the accurate heating of moisture, also identical with the 1st control method of having narrated, can reappear well.
In addition, the formation of Jie Shiing is in the present embodiment, the checkout gear of sensor and so on is not set, heating means according to the input unit input, follow the heating condition after in memory storage, preestablishing and continue heating, but also can carry out instrumentation, the checkout gear that the power supply of subtend steam generator is fed back is set the environment of heating clamber.As this checkout gear, have temperature sensor and humidity sensor.
In addition, heating finishes back (C constantly), opens the door of heating clamber until take out till the food, only continue the environment adjustment and can not influence do the food after well warm, also can be incubated.
Because control part can be read control data with corresponding steam generator such as the kind of food and component, beginning temperature (freezing, cooling preservation etc.), temperature after heating and magnetron by the number search memory of heating instruction key input, control at any time so also can comply with it.
(embodiment 5)
The 5th embodiment is described as follows.Figure 11 is the line chart that expression makes the food heating method that the temperature of central part and end more evenly rises.(a) be that expression the present invention adds the temperature and the line chart of food temperature in the heating clamber pined for, (b) variation of expression heating indoor humidity (c) is represented the state of microwave output power.Here, temperature, the humidity in the heating clamber before heating finishes is controlled to temperature, the humidity that effective cooked food is used.
(a) in since from the food temperature of cryogenic temperature (20 ℃) beginning to maximum ice crystallization generating zone (5~-1 ℃), only absorb microwave, so temperature rises lentamente.Since maximum ice crystallization generating zone in order to dissolve ice consumed energy, so just through some times by (moment A).Then, in case crossed A constantly, then food absorbs microwave sharp, thereby food temperature begins rapid rising.
In (a) and (b), though the temperature of heating clamber, humidity reach the heating done state, need some times and before the environment adjustment finishes, do not finish cooking, adjust microwave output power among the figure (c) according to food.In addition, to the uniform food of the temperature-rise ratio of food central part and end, behind moment A, needn't be reduced to low power output again.Like this, owing to adjust environment according to the heating done state in the heating clamber, so the latent heat of foods using steam is just in time once warm from the surface, simultaneously, owing to utilize microwave to heat, so when cooking finishes, the temperature equalization of food center and end is good, and temperature is risen.In addition,,, conversely, can not be clamminess yet, can carry out good cooking so gruel or rice can be not dry or dry and soft owing to moderately kept the moisture of food surface.
(embodiment 6)
The 6th embodiment is described as follows.Figure 12 is the line chart of expression central portion than the food heating method of the first temperature rising in end.(a) be that expression the present invention adds the temperature and the line chart of food temperature in the heating clamber pined for, (b) variation of expression heating indoor humidity (c) is represented the state of microwave output power.Here, temperature, the humidity in the heating clamber before heating finishes is controlled to temperature, the humidity that effective cooked food is used.
From the food of cryogenic temperature (20 ℃) beginning if from initial irradiating microwaves, then penetrate microwave and earlier warm from central authorities in food central authorities, shown in (a) and (b), immediately temperature in the heating clamber and humidity are adjusted into the heating done state, and utilize the temperature difference of environment and food earlier, steam is condensate on the food surface, forms moisture film by the temperature of environment.Like this, after just dissolving food surface (constantly A), shown in (c), heating using microwave Once you begin then penetrates in the part of the microwave of food inside and also is absorbed at the food surface layer, and food heats equably from inside and outside quilt.Therefore, when steamed dumpling with the dough gathered at the top is put into mouth proper temperature, sting Shi Buhui and think that the inside is very boiling hot, so can integral body warm equably.In addition, the surface can be dry, does moisteningly and very nice, by experiment showed, with only heat with microwave after situation compare, before the heating with heating after the weight minimizing less.In addition because shrimp fritter makes face clothing and the roughly the same temperature of shrimp, the shrimp of hometown face can the heating earlier of specific surface clothing and the water transport of dehydration hardening, shrimp to the face clothing and feel stickingly, can carry out good cooking.In addition, according to experiment, after cooking finishes, though the face clothing than moistening with after the heating using microwave only, evaporating surplus moisture content gradually when being put on the dining table, has resembled the fried face clothing very dry.
(embodiment 7)
The 7th embodiment is described as follows.Figure 13 is the line chart of expression end than the food heating method of the first temperature rising of central portion.(a) be that expression the present invention adds the temperature and the line chart of food temperature in the heating clamber pined for, (b) variation of expression heating indoor humidity (c) is represented the state of microwave output power.(a) in, the food temperature that begins from cryogenic temperature (20 ℃) passes through maximum ice crystallization generating zone (1~-5 ℃) (A constantly) through some times.
Begin to this moment A from heating, food only absorbs microwave, in addition, it is also better to penetrate microwave to food inside, shown in (c), microwave output power preceding half with gross output to freezing food irradiation, at this moment, for making microwave penetrate food inside well, the most important thing is to dissolve as far as possible food surface and adsorption moisture not.Therefore, shown in figure (b), (A constantly) can control the interior temperature adjustment of heating clamber till beginning to dissolve to food products part.That is, thaw and mainly when food freezing, bear, suppress steam by being penetrated into dark especially heating using microwave.
Then, in case surpass A constantly, just food sharply absorbs microwave under the state at the position that is mixed with the position after dissolving and does not thaw.As narrating, because the position (moisture) after dissolving presents several times to tens times dielectric loss in freezing position, so the position after dissolving is bigger with the position temperature difference of not thawing.So shown in (c), be reduced to the part of gross output, and one side is carried out the heat conduction from the high position of temperature to low position, one side continuation heating with making the microwave output power ladder.As (a) and (b), temperature in the heating clamber and humidity begin to be adjusted into food heating done state from described moment A, and utilize steam to encase food surface and heat, and help internal temperature to rise.Again, in (a),, shown in (a) and (b), continue temperature adjustment, damping, wait for that internal temperature rises even reach the heating end temp and under the lower situation of (constantly B) internal temperature, shown in (c), finish microwave irradiation at moment B in surface temperature.Like this, end excessive heat, hardening or the moisture that just can prevent hamburger minced beef cutlet or add the curry meal boil dry, and can suitable temperature be warming to inside.
(embodiment 8)
The 8th embodiment of heater is described as follows to being provided with independently in order thoroughly to prevent to condense the globule in the heating clamber.
As the heater of Figure 14, so-called steam generator 15 is in addition heater 30 to be arranged on the steam passing away, and control part can rise the temperature in the heating clamber prior to the steam generation and to described heater power supply.Adopt this structure, can prevent more up hill and dale in ice-cold heating clamber wall condensed vapor.
In addition, utilize this independently heater, control, can be adjusted to the temperature and humidity of the noncondensing globule of heating clamber internal face by the control part subtend steam generator 15 and the power supply of heater 30.As this environment, under situation about the relative humidity in the heating clamber being adjusted into below 90%, effect is higher.
(embodiment 9)
The 9th embodiment of heater is described as follows to being provided with independently in order thoroughly to prevent to condense the globule in the heating clamber.Figure 15 is illustrated in the example of the microwave heating equipment that has electrothermal heater in the heating clamber,, the heater in the environment adjusting device 30 is replaced as this electrothermal heater 31 that is, and has considered the structure that makes function compound.
Steam generator is not limited to that present embodiment discloses, and also can also can fix with methods such as solderings in boiler's the outside preventing that water heater puts into common boiler.But, in this case because the steam temperature that produces can arbitrarily control, so best structure be, make the part of heater be higher than water level in the boiler, the steam after the generation makes the temperature rising with form independently.
(embodiment 10)
Below, with reference to the description of drawings another embodiment of the present invention.Figure 16 is the cutaway view of the microwave heating equipment of another embodiment of the present invention.On heating clamber 13, be provided with magnetron 14, microwave irradiation is arrived in the heating clamber 13 as microwave generating apparatus.Be provided with the steam generation chamber 32 that constitutes with nonmagnetic material in the side of heating clamber 13.One end of steam generation chamber 32 is connected with heating clamber 13 with effuser 33, and the other end is connected with tank 12 with inflow pipe 34.In steam generation chamber 32 inside, place heating metallic object 35 with the metal formation of magnetic.At this moment, it is good more that metallic object 35 fills up steam generation chamber 32 more, and heating metallic object 35 is if be best by the material of magnetic field heating, especially shape is careless, but in the present embodiment, be the contact area of more acquisitions and water, use the foaming shape that constitutes by continuous air bubbles or form fibrous metallic object.
If constituting the material of steam generator 32 is not nonmagnetic material, but constitute with the magnetic material, heating metallic object 17 then need be set, but, this situation is owing to the pondages in the steam generation chamber 32 increase, to producing steam the anxiety of spended time is just arranged, wait and in fact reduce pondage so be necessary to insert ducted body, or improve the temperature of water storage in advance.
In the periphery of steam generation chamber 32, be wound with magnet exciting coil 36, magnet exciting coil 36 is connected with the inverter power supply 37 of supplying with alternating current.Be used to the electric current of transformation into itself's device power supply 37, in magnet exciting coil 36, produce AC magnetic field, utilize this AC magnetic field in heating metallic object 35, to produce eddy current, thereby heating metallic object 35 is by eddy-current heating.Water in the steam generation chamber 32 is heated by the heat of heating metallic object 35 and produces steam, and this steam passes through effuser 33 and flows in the heating clamber 13.The 38th, high-tension electricity is supplied to the high voltage source of magnetron 14.The electric power control of the connection of inverter power supply 37 and high voltage source 38, the action of cut-out or power supply separately is by control part 21 controls.In heating clamber 13, be provided with have make peristome that steam passes through put sundries ware 20, place food 19 in the above.
Magnet exciting coil 36 self does not generate heat, because eddy current directly makes 35 heatings of heating metallic object, so this heat is directly delivered in the water, can produce steam expeditiously.
In addition, for example columned insulator of steam generation chamber 32 usefulness forms.For example form with materials such as heat resistant glass, magnetic.In addition, the thickness of the wall of steam generation chamber 32 is set the thickness of using the voltage that is added on the magnet exciting coil also not destroy insulation for.In addition, for example nickel, nichrome or stainless steel etc. form heating metallic object 35 by the metal of water proofing property, corrosion resistance.
Figure 17 is the line chart of expression heating clamber inner vapor amount.Among Figure 17, expression with heat time heating time through and the variation of heating clamber inner vapor amount and is expressed as follows state: in the time of the heating beginning, also begin action as the steam generator of steam generating device, heating finishes, and the action of steam generator also stops simultaneously.In experiment, the power output of inverter power supply 37 is 400W, and heating metallic object 35 is heated, and the time of steaming is to begin to produce steam in about 10 seconds, and roughly the several seconds just stopped to produce steam after heating finished.Like this, along with the action of steam generator, compared with prior art available when very fast chien shih its and then produce steam and stop action.In addition, required input power supply is considerably less just can produce steam.This situation is, the AC magnetic field of the magnet exciting coil that electric power produced 36 of origin transformation into itself's device power supply 37 is to the 35 instantaneous heating of heating metallic object, and the water in the steam generation chamber 32 are heated, and produces steam expeditiously.Heating metallic object 35 is the foaming shape metals that are made of the continuous air bubbles with the extensive contact area of water, or efficient is more remarkable under the situation of fibrous metal.In addition, by placing heating metallic object 35 in the volume in steam generation chamber 32, the volume ratio that water accounted for is less, and the water that only heats less volume is just passable, utilizes this effect, can very fast at short notice generation steam.
Though this steam time of origin is short approximately good more, concerning practicality, in 1 minute, best about 10 seconds.
(embodiment 11)
Figure 18 be the expression the 11st embodiment the microwave heating equipment heating clamber in the cooking in food temperature and the line chart of vapor volume relation.Among Figure 18, begin to match, microwave generating apparatus action beginning and steam generating device action beginning are carried out simultaneously with heating.Both also finish simultaneously when finishing and heat.Because steam generator steams rapidly, even begin beginning with steam generator action so carry out microwave motion simultaneously, several seconds when only steaming, only become the independent heating of microwave, owing in the time, carry out cooking for two kinds with microwave and steam at most cooking, one side is controlled the evaporation of food water and is simultaneously heated, so food can be cooked moisteningly, and ready-made in good shape, thereby can realize good cooking.
(embodiment 12)
Figure 19 is the food temperature in the cooking of microwave heating equipment of expression the 12nd embodiment and the line chart of vapor volume relation.Among Figure 19, when food is freezing, that is, food temperature is during zubzero temperature, owing to microwave is penetrated in the middle of the food easily, so only heat with microwave.Continue defrosting food, dissolve freezingly, be converted to moment of temperature above freezing from food temperature, steam generator moves, and carries out cooking by microwave and steam.Though food temperature is after becoming temperature above freezing, transpiring moisture from food easily, but because by encasing by the steam in the heating clamber around the food, prevent transpiring moisture from food, and when preventing drying, continue cooking, so food also can be cooked moisteningly, and ready-made in good shape, just can realize good cooking.Because only the chien shih steam generator moves when required, so do not need unnecessary electric power, can save energy.
(embodiment 13)
Figure 20 is the line chart of another embodiment of food temperature in the cooking in the microwave heating equipment heating clamber of the 13rd embodiment and vapor volume relation.Among Figure 20, when microwave generating apparatus begins to move, match with beginning heating, steam generating device begins action simultaneously.And heating is when finishing, only so that the time that the steam in the heating clamber reduces stop the action of steam generator earlier.Then, stop the action of microwave, cooking finishes.Therefore, when heating finished, the steam in the heating clamber just became the state of minimizing, and when taking out food, also can not contact with high-temperature vapour, can realize the cooking method of processing ease.
(embodiment 14)
Figure 21 is the temperature of the food during the microwave heating equipment of expression the 14th embodiment is cooked and the line chart of vapor volume relation.Among Figure 21, when food is freezing, that is, food temperature heats with the power output of the steam generator of the microwave of high-output power and low power output during zubzero temperature.Then, continue defrosting food, dissolve freezingly, be converted to the roughly moment of temperature above freezing from food temperature, power output in the middle of microwave output power is dropped to, power output in the middle of simultaneously the power output of steam generator being brought up to.And food temperature is from rising to the moment about medium temperature, and the power output of microwave drops to low power output, steam generator power output bring up to high-output power.So, along with the carrying out of heating, the power output of microwave and the power output of steam generator are changed.For example, when food is freezing, utilize microwave to be penetrated into characteristic in the ice more deeply easily, carry out quick-thawing.Then, the microwave and the steam of output prevent the food temperature inequality, and slowly improve temperature in the middle of utilizing.At this moment, the steam of output has the effect that makes food temperature keep evenly, prevent the food water evaporation.And continue to heat, owing to make the very high final stage of food temperature rising, Yin Gengyi generation temperature inequality so slowly heat with the microwave that hangs down power output again, hot the moving of the inner generation of food, that is, is simultaneously utilized to change over to heat and is simultaneously continued to heat.Though the moisture of the high more food of food temperature is easily evaporation just, but because a large amount of abrim steams in the heating clamber, so can enough avoid evaporating, and also heat with the heat of steam, thereby prevent at the food surface distribute heat, and owing to encase food integral body and heat, thus can make the food bulk temperature even and prevent drying, do moisteningly and good state under carry out cooking.
(embodiment 15)
Figure 22 is the cutaway view of the microwave heating equipment of the 15th embodiment.On heating clamber 13, be provided with magnetron 14, microwave irradiation is arrived in the heating clamber 13 as microwave generating apparatus.In the side of heating clamber 13, the steam generation chamber 32 that constitutes with nonmagnetic material is set.The lower end of steam generation chamber 32 is connected with heating clamber 13 with effuser 33, and the upper end is connected with tank 12 with inflow pipe 34.Between inflow pipe 34 and tank 12, the tap 39 of regulating discharge is set.In the inside of steam generation chamber 32, place the heating metallic object 35 that constitutes with the magnetic metal.For obtaining the contact area with water more, that heating metallic object 35 uses the foaming shape that is made of continuous air bubbles or form fibrous metallic object.In the periphery of steam generation chamber 32, coiling magnet exciting coil 36, magnet exciting coil 36 is connected with the inverter power supply 37 of supplying with alternating current.Be used to the electric current of transformation into itself's device power supply 37, in magnet exciting coil 36, produce AC magnetic field.Utilize this AC magnetic field in heating metallic object 35, to produce eddy current, utilize eddy current to make 35 heatings of heating metallic object.The water that injects from tank 12 by inflow pipe 34 from the top of heating metallic object 35.At this moment, with the flow of tap 39 control water, the water yield that the water that only drips evaporation is required.Drip to the water in the steam generation chamber 32, the heat heating by heating metallic object 35 produces steam, and this steam flows in the heating clamber 13 by effuser 33.The 25th, fan, the steam that will produce in steam generation chamber 32 is sent in the heating clamber 13.The 38th, high-tension electricity is supplied to the high voltage source of magnetron 14.
The electric power control of the connection of inverter power supply 37 and high voltage source 38, the action of cut-out or power supply separately is by control part 21 controls.In heating clamber 13, be provided with have make peristome that steam passes through put sundries ware 20, place food 19 in the above.Magnet exciting coil 36 self does not generate heat, because eddy current directly makes 35 heatings of heating metallic object, so this heat is directly delivered in the water, can produce steam expeditiously.
The heating means that employing is made of heating device like this, because only the required water of heating evaporation gets final product, so the water yield of heating with a little just, and just roughly moment produces steam because with small electric power, so can instantaneously heat beginning, heating end, owing to carrying out, can realize the optimal thermal control that adds, again so can carry out optimal cooking according to various food according to the food cooking.
The possibility of industrial utilization
The present invention can suitably control temperature, humidity in the heating clamber as mentioned above owing to match with food Deng environment, so can carry out good cooking to multifarious food. That is, adopt microwave of the present invention to add Hot charging is put, and can make food internal temperature and surface temperature roughly the same, can eat under the most suitable state The cooking of product.
As the present invention's food applicatory, except the bread and freezing Orly food narrated, also can fit Be used for a plurality of food raw materials and be mixed among 1 packing material, only make and separate with the heating using microwave of prior art is very difficult Freeze and the packed meal of heating again, by maximum ice crystallization generating zone, the refrigerating chamber that it is stopped with temperature of refrigerating chamber Thaw etc.
In addition, as the food of being not only of heating object, can be widely variously to have medium and decrease The material of consumption is heating target, for example, and the melting of synthetic resin, bonding dose the drying etc. of softening, timber, Need can be applicable to the accurately various industrial circles of heating.
In addition, as thermal source, except microwave, also can utilize high-frequency AC field etc.

Claims (13)

1. a microwave heating equipment has: the heating clamber of placing heating object; With the microwave generating apparatus of microwave irradiation to described heating object; Steam is supplied to the steam generating device of described heating clamber; Input unit; And control device, it is characterized in that, described control device is controlled power supply to described microwave generating apparatus and described steam generating device according to the heating of input unit instruction, thereby the environment to described heating object is regulated, so that described heating object internal temperature is consistent with surface temperature.
2. microwave heating equipment as claimed in claim 1, it is characterized in that, also have the checkout gear that detects described heating indoor environment, described control device is controlled power supply to described microwave generating apparatus and steam generating device according to the output of described checkout gear.
3. microwave heating equipment as claimed in claim 2 is characterized in that, described checkout gear detected temperatures.
4. microwave heating equipment as claimed in claim 2 is characterized in that, described checkout gear detected temperatures and humidity.
5. as each described microwave heating equipment in the claim 1 to 4, it is characterized in that, described control device under the situation that the described heating object to freezing state heats, the power output of described steam generating device when the power output of described steam generating device is in freezing state greater than described heating object behind the described heating object that thaws.
6. as each described microwave heating equipment in the claim 1 to 4, it is characterized in that, described control device is under the situation that the described heating object to freezing state heats, the thaw power output of described microwave generating apparatus when the power output of described microwave generating apparatus is in freezing state less than described heating object behind the described heating object, and the power output of the power output of the described steam generating device behind the described heating object that thaws described steam generating device when being in freezing state greater than described heating object.
7. as each described microwave heating equipment in the claim 1 to 4, it is characterized in that, described control device is under the situation that the described heating object to freezing state heats, and the power output that has just begun the described microwave generating apparatus that heats is greater than the power output of thereafter described microwave generating apparatus.
8. as each described microwave heating equipment in the claim 1 to 4, it is characterized in that, described control device is under the situation that the described heating object to freezing state heats, the power output ladder ground of microwave generating apparatus reduces, and the power output of steam generating device when the power output of steam generating device is in freezing state greater than heating object behind the heating object that thaws.
9. as each described microwave heating equipment in the claim 1 to 4, it is characterized in that before heating object will finish heating, described control device reduced the power output of described steam generating device.
10. as each described microwave heating equipment in the claim 1 to 4, it is characterized in that the humidity that described control device is adjusted in the heating clamber is below 90%.
11. microwave heating equipment as claimed in claim 1 or 2 is characterized in that, also has the fan that wind is supplied to described heating object, described fan is controlled by described control device.
12. microwave heating equipment as claimed in claim 11 is characterized in that, described fan imports extraneous air in the heating clamber.
13. microwave heating equipment as claimed in claim 11 is characterized in that, described fan makes the air circulation in the heating clamber.
CN96194931A 1995-06-22 1996-06-24 Microwave heater Expired - Lifetime CN1109850C (en)

Applications Claiming Priority (15)

Application Number Priority Date Filing Date Title
JP155890/1995 1995-06-22
JP155889/1995 1995-06-22
JP7155888A JPH094848A (en) 1995-06-22 1995-06-22 Combined cooker
JP15589095A JP3633037B2 (en) 1995-06-22 1995-06-22 High frequency heating device
JP155888/95 1995-06-22
JP155887/95 1995-06-22
JP15588995A JP3477919B2 (en) 1995-06-22 1995-06-22 Food cooking method using steam and microwave
JP155888/1995 1995-06-22
JP155886/1995 1995-06-22
JP155887/1995 1995-06-22
JP155889/95 1995-06-22
JP15588795A JP3579965B2 (en) 1995-06-22 1995-06-22 High frequency heating equipment
JP15588695A JPH094854A (en) 1995-06-22 1995-06-22 High-frequency heater
JP155890/95 1995-06-22
JP155886/95 1995-06-22

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CN1109850C true CN1109850C (en) 2003-05-28

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