CN102538037B - Heating device - Google Patents

Heating device Download PDF

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Publication number
CN102538037B
CN102538037B CN201110432385.5A CN201110432385A CN102538037B CN 102538037 B CN102538037 B CN 102538037B CN 201110432385 A CN201110432385 A CN 201110432385A CN 102538037 B CN102538037 B CN 102538037B
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China
Prior art keywords
loading
temperature
heating
infrared ray
heating device
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Expired - Fee Related
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CN201110432385.5A
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Chinese (zh)
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CN102538037A (en
Inventor
藤涛知也
河合祐
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Abstract

The present invention provides heating device, even if load is for also to be able to prevent heating on a small quantity.This heating device possesses: microwave generation unit (1);Heating chamber (2);Measure the infrared ray sensor (3) of load temperature non-contactly;Make infrared ray sensor (3) movable and change the movable part (4) of the temperature measuring position in heating chamber (2);The temperature measured according to infrared ray sensor (3) and the information located control the control unit (5) of microwave generation unit (1);And the loading identifying unit (6) of the loading in judgement heating chamber (2), when loading identifying unit (6) judges that loading is as time a small amount of, control unit (5) detects the maximum temperature of measured temperature, movable part (4) when judging loading as volume than loading identifying unit (6) little and comprise be measured in the range of the position of maximum temperature movable, thus, even if also being able to prevent heating when a small amount of load is heated.

Description

Heating device
Technical field
The present invention relates to the heating device used in general family, dining room and office etc..
Background technology
In the past, an example as this heating device, Patent Document 1 discloses following method: make infrared ray sensor movably measure temperature for the temperature of positions multiple in measuring heating chamber, thus, the most great load and no matter be placed in which position, can heat with appropriate temperature.
[patent documentation 1] Japanese Unexamined Patent Publication 2002-168457 publication
But, in above-mentioned existing structure, it is to make temperature sensor movably come alteration detection position, so the temperature of same detection position can only be measured discretely.In this case, there is following problem: when heating a small amount of load, in the period measuring other position, load can be heated to more than target temperature.
Summary of the invention
The present invention makes to solve above-mentioned existing problem, even if its objective is to provide a kind of heating device heating a small amount of load and also being able to stop heating in the case of there is not heating.
In order to solve above-mentioned existing problem, the heating device of the present invention has: microwave generation unit;Storage microwave carries out the heating chamber of the load heated;Measure the infrared ray sensor of load temperature non-contactly;Make infrared ray sensor movable and change the movable part of the temperature measuring position in heating chamber;The temperature measured according to infrared ray sensor and the information located control the control unit of microwave generation unit;And the loading identifying unit of the loading in judgement heating chamber.
In this configuration, when loading identifying unit judges that loading is as time a small amount of, the maximum temperature of the temperature that control unit is measured, the movable part scope when judging loading as volume than loading identifying unit little and comprise detect in the range of the position of maximum temperature movable.
Even if a small amount of load is heated by the heating device of the present invention, it is also possible to stopped heating in the case of there is not heating, it is possible to the processability making heating is good.
Accompanying drawing explanation
Fig. 1 is the profile of the heating device in embodiment of the present invention.
Fig. 2 shows the movable range of the infrared ray sensor of the heating device in embodiment of the present invention, loading and movable range corresponding with the loading of infrared ray sensor.
Fig. 3 shows the difference of the variations in temperature caused because of loading of the heating device in embodiment of the present invention.
Fig. 4 shows the microwave output of the heating device in embodiment of the present invention.
Fig. 5 shows the Temperature Distribution in the heating chamber of the load in the heating chamber of the heating device in embodiment of the present invention and the heating device in embodiment of the present invention.
Symbol description
1 microwave generation unit
2 heating chambers
3 infrared ray sensors
4 movable parts
5 control units
6 loading identifying units
7 humidity sensors
8 air vents
9a, 9b weight sensor
Detailed description of the invention
1st mode is heating device as follows, and this heating device has: microwave generation unit;Storage microwave carries out the heating chamber of the load heated;Measure the infrared ray sensor of load temperature non-contactly;Make above-mentioned infrared ray sensor movable and change the movable part of the temperature measuring position in above-mentioned heating chamber;The temperature measured according to above-mentioned infrared ray sensor and the information located control the control unit of above-mentioned microwave generation unit;And judge the loading identifying unit of loading in above-mentioned heating chamber, wherein, when above-mentioned loading identifying unit judges that loading is as time a small amount of, the maximum temperature of the temperature that above-mentioned control unit is measured, above-mentioned movable part makes in the range of following movable: scope when this scope judges loading as volume than above-mentioned loading identifying unit is little and comprises the position being measured to maximum temperature, thereby, it is possible to shorten temperature detection interval and prevented heating.
In the 2nd mode, particularly, temperature measuring position is fixed on infrared ray sensor and is measured to the position of maximum temperature by the movable part of the 1st mode, thus makes temperature detection interval minimize such that it is able to prevent a small amount of load crosses heating.
In the 3rd mode, particularly, also there is in the 1st mode the humidity sensor of the vapor volume measured in heating chamber, the output of above-mentioned humidity sensor after loading identifying unit drives the microwave generation unit stipulated time according to control unit carrys out detection load amount, it is possible to detection load amount rapidly.
In the 4th mode, particularly, the rate of change of the temperature that the loading identifying unit of the 1st mode is measured according to infrared ray sensor carrys out detection load amount, it is possible to detection load amount exactly.
In the 5th mode, particularly, the loading identifying unit of the 1st mode judges loading by the weight of detection load, it is possible to directly detect loading.
In the 6th mode, particularly, the control unit of the 1st mode changes the output of microwave generation unit before and after loading identifying unit judges loading, it is possible to be more reliably prevented from heating.
In the 7th mode, particularly, the loading identifying unit of the 1st mode judge loading as in the case of a small amount of, control unit reduces the output of microwave generation unit, it is possible to prevent heating.
In the 8th mode, particularly, after the movable part of the 1st mode changes the movable range of infrared ray sensor, control unit improves the output of microwave generation unit, it is possible to be heated to quickly target temperature.
Hereinafter, it is explained with reference to embodiments of the present invention.Additionally, the present invention is not limited by this embodiment.
Fig. 1 shows the profile of the heating device in embodiment of the present invention.The heating device of present embodiment possesses: produce the microwave generation unit 1 of microwave;Storage microwave carries out the heating chamber 2 of the load heated;Measure the infrared ray sensor 3 of load temperature non-contactly;Make infrared ray sensor 3 movable and change the movable part 4 of the temperature measuring position in heating chamber 2;The temperature measured according to infrared ray sensor 3 and the information located control the control unit 5 of microwave generation unit 1;And the loading identifying unit 6 of the loading in judgement heating chamber 2.
Generally, microwave generation unit 1 is used mostly magnetron but it also may be semiconductor-type etc..Microwave generation unit 1, according to the instruction from control unit 5, provides electric power from not shown inverter circuit etc., thus produces microwave.The frequency of produced microwave is typically 2450MHz, but is not limited to this.
Microwave imports in heating chamber 2 via antenna, and sometimes uses following structure etc.: fixes by antenna, arrange the structure of turntable in the way of load rotation;Structure load being placed in same position and make antenna rotate.
Heating chamber 2 is made up of metals such as aluminum or rustless steels (SUS), loads load, and is imported to by the microwave that microwave generation unit 1 produces in heating chamber 2, thus heat load in heating chamber 2.
Although there is microwave in heating chamber 2, but perfect condition is only load to be carried out microwave heating.Therefore, in the case of heating chamber 2 is such as made up of glass etc., glass can generate heat because of microwave, thus produces loss on heating.
Therefore, in order to reduce loss on heating, it is preferred to use the metal not generating heat because of microwave and microwave being reflected.But, since it is desired that the microwave produced from microwave generation unit 1 is imported in heating chamber 2, so the part that generally will be only used in importing microwave is changed to other material.
Infrared ray sensor 3 detects temperature in a non-contact manner, has the photodiode of pattern of fever thermoelectric pile, bolometer or quantum type, phototransistor etc., and can also be other type of sensor.
For thermoelectric pile, there is also such thermoelectric pile: in an encapsulation, there is multiple element, and the temperature of each element diverse location can be detected.Generally in such element, it is the temperature taking out and utilizing each element successively mostly, but is not limited to this.
Infrared ray sensor 3 is installed, by making movable part 4 movable on movable part 4, it is possible to utilize infrared ray sensor 3 to measure the diverse location in heating chamber 2.In the case of movable part 4 employs motor, it is fixing for locating, the most proper but it also may be linear motor etc..
It addition, in order to position, it is possible to use rotary encoder.Additionally, movable part 4 can make infrared ray sensor 3 the most movable, it is possible to so that infrared ray sensor 3 is the most movable.
Control unit 5 is connected with microwave generation unit 1, infrared ray sensor 3, movable part 4 etc..When user sets heating mode and time etc. by not shown operating portion, control unit 5 makes not shown inverter circuit work power microwave generation unit 1, produces microwave from microwave generation unit 1.
Control unit 5 makes movable part 4 movable, is measured the temperature of the load being placed in heating chamber 2 by infrared ray sensor 3.Further, control unit 5 carries out following control etc.: according to the duty of its measurement result change microwave generation unit 1, after load is heated to the desired temperature of user, make the work of microwave generation unit 1 stop.Control unit 5 make use of microcomputer, DSP or customization IC etc. mostly, but is not limited to this.
Loading identifying unit 6 judges the loading in heating chamber 2, and sends its result to control unit 5.Then, control unit 5 carrys out modification control method according to this loading.Loading identifying unit 6 and control unit 5 can be identical structural elements.
Hereinafter, action, effect to heating device as constructed as above illustrate.
User opens not shown door, loads load in heating chamber 2.In FIG, the antenna that the microwave that microwave generation unit 1 produces is rotated imports in heating chamber 2.Because antenna is to rotate, so the microwave distribution moment in heating chamber 2 changes, which position no matter load being placed in heating chamber 2, can heat.Therefore, for the heating device of this structure, any position that load can be placed in heating chamber 2 by user.
On the other hand, as mentioned above, it is possible to antenna is fixed and makes load rotate.In the case, there is the turntable for making load rotate, so user needs to be placed on turntable load.
User determines heating means by not shown operating portion.Generally in the case of such heating device, may select several heating means such as microwave heating, light heater heating, oven heat.
In the present embodiment, situation about heating with microwave is illustrated.It addition, as heating mode, exist and set output by user and the time carries out the manual mode that heats and only selects cooking content and be automatically stopped the automatic mode etc. of heating.User may select these patterns and door closedown begun to warm up.
After beginning to warm up, control unit 5 makes infrared ray sensor 3 movable by movable part 4, and infrared ray sensor 3 measures the temperature in heating chamber 2, and control unit 5 accepts its temperature information and carrys out Variation control content.
As controlling content, such as, in the case of have selected the mode automatically carrying out beverage heating, continuous heating is to reaching set temperature, when reaching set temperature, stops the work of microwave generation unit 1 and terminates heating.Fig. 2 (A) is the figure of the movable range of the infrared ray sensor illustrating the heating device in first embodiment of the present invention, Fig. 2 (B) is the figure of the loading illustrating the heating device in first embodiment of the present invention, and Fig. 2 (C) is the figure of the movable range corresponding with loading of the infrared ray sensor illustrating the heating device in first embodiment of the present invention.
Because not knowing which position that load is received in heating chamber 2, so as shown in Fig. 2 (A), movable part 4 is in the way of the whole positions making infrared ray sensor 3 and can being measured in heating chamber 2, movable in the range of a1~d1.
But, because being to make infrared ray sensor 3 movably come alteration detection position in this wise, it is only capable of measuring discretely the temperature of same detection position.Such as, when the position of infrared ray sensor 3 a1 in Fig. 2 (A) measures temperature, infrared ray sensor 3 changes successively under the effect of movable part 4 and locates, and is also measured the position of b1, c1, d1.Then, movable part 4 makes infrared ray sensor 3 movable to opposite direction, and according to the order sequentially determining temperature of d1, c1, b1, then the position also for a1 carries out temperature measuring.
That is, for the end in storehouse such for a1, d1, when set make infrared ray sensor 3 the time that the scope of a1~d1 is movably spent as t time, be only capable of the time interval determination temperature with substantially 2t.On the other hand, the central authorities in storehouse, it is possible to be measured with the time interval of substantially t.
Either which kind of mode, all can only obtain the temperature information of same position with the interval of time more than t.Therefore there is such problem: in the period of time t~2t measuring other position, load temperature can be heated to more than target temperature.Especially in the case of a small amount of load, heat up very fast, so it crosses punching also becomes big.
Even if the purpose of embodiment of the present invention is to provide a kind of heating device heating a small amount of load and also being able to stop heating in the case of there is not heating.
In embodiments of the present invention, utilize loading identifying unit 6 detection load amount, shorten the interval that infrared ray sensor 3 is measured, thus prevented heating.Specifically, in the case of load is shown in Fig. 2 (B), if infrared ray sensor 3 as Fig. 2 (C) only in the range of b1~c1 movably.
In other words, it is possible to save the temperature detection of the scope of a1~b1, c1~d1 and movable time.Thereby, it is possible to shorten measuring interval and be quickly detected load and the most reached target temperature, it is possible to reduced punching.Therefore, it is possible to stopping heating at the temperature of target temperature, bring facility to user.
Here, the detection method of loading is illustrated.Fig. 3 is the figure of the difference of the variations in temperature caused because of loading illustrating heating device in first embodiment of the present invention.The method of detection load amount is roughly divided into 3 kinds.
First, the 1st kind of method is the method carrying out judging according to rate of temperature change.As shown in Figure 3, when identical type, the amount different load (heating object) of volume being heated with the microwave of equal-wattage, about the time needed for being heated to temperature FT2 from temperature FT1, it is being Ta for this time in the case of a small amount of, on the other hand, in the case of for volume, this time is Tb, and Ta < Tb.
Further, the relation of Ta to Tb is the most proportional with its loading.Therefore, in the case of the load temperature after certain stipulated time is more than set point of temperature, loading identifying unit 6 is detected as being a small amount of load.
Here, in the case of making infrared ray sensor 3 movable, it is impossible to the stipulated time is set as the movable required time below, even but needing to be set as the time (such as, 15 seconds) that a small amount of load also will not occur heating.
It addition, the set point of temperature needed for Pan Dinging is that the temperature before heating occurred, it is preferably below the target temperature of heating, but optimum temperature is different with load, so being such as set as 50 DEG C etc..
It addition, in the case of microwave output is big, the slope of Fig. 3 becomes big, so the output of microwave before loading identifying unit 6 judges loading, can be reduced, from judging to terminate, increase the output of microwave, it is possible to prevent further heating.
Additionally, judge that the microwave output after terminating can be changed according to loading.Fig. 4 shows the microwave output of the heating device in first embodiment of the present invention.At time Tc (such as, the 15 seconds) place from heating and starting, loading identifying unit 6 judges loading.
Now, the microwave ending in time Tc is output as O2.This microwave output O2 is set to: even a small amount of load, heating also will not occur at time Tc.As the Tc time of advent, loading identifying unit 6 judges loading according to the temperature information of infrared ray sensor 3.
That is, if temperature is more than set point of temperature, then it is judged to it is a small amount of load, if less than set point of temperature, is then judged to it is the load of volume.About the benchmark judged, it is possible to change more meticulously.
When determining loading in this wise, its result of determination is sent to control unit 5 from loading identifying unit 6, and control unit 5 can be according to the output of this loading change microwave.Specifically, in the case of loading is volume, microwave output is brought up to O3 from O2, thus, even the load of volume, it is also possible to realize at short notice heating.On the other hand, in the case of for a small amount of load, it may occur however that cross heating, so microwave output is reduced to O1 from O2, thus it is difficult to heating.
The output change of such microwave is to be difficult to occur heating in the case of a small amount of load further, but not necessarily carries out such change.
Then, the method for the 2nd kind of loading detection is illustrated.Humidity sensor 7 shown in Fig. 1 detects the steam etc. produced by load.When humidity sensor 7 is arranged in heating chamber 2, there is the problem of thermostability and produce the problem of noise, so being arranged in air vent 8 by humidity sensor 7.For humidity sensor 7, there are relative humidity sensor and absolute humidity sensor, no matter can with which kind of.
The steam etc. that air vent 8 produces in by heating chamber 2 is discharged into outside heating chamber 2, is configured to the position that steam etc. is difficult to beyond air vent 8 and lets out in heating chamber 2.Thus, humidity sensor 7 is capable of detecting when the steam etc. produced by load.
When heating load, the moisture contained in load is heated to be steam and discharges.The vapor volume discharged depends on loading.Therefore, can when the vapor volume that humidity sensor 7 detects is few, loading identifying unit 6 judge load as a small amount of, when vapor volume is many, loading identifying unit 6 judges that load is as volume.As carrying out opportunity of judging, it is contemplated that after temperature after a predetermined time or detected by infrared ray sensor 3 reaches set point of temperature from heating etc., but be not limited to this.
Then, the method for the 3rd kind of loading detection is illustrated.Loading identifying unit 6 is provided with weight sensor 9a, 9b, detection mounting portion and the weight of load in the bottom of the mounting portion of mounting load.Show the example being provided with 2 weight sensors 9a, 9b in the present embodiment, but the quantity of weight sensor is not limited to this, it is also possible to be 1 or more than 3.In the weight data measured in this wise, comprise mounting portion and place the weight of vessel etc. of the food as load, therefore can not be said to be weighing load accurately.
But, the weight of mounting portion is fixing, so can be deducted, and for the weight of vessel, can register in advance, it is possible to calculate exactly the weight of the food oneself being originally desired with heating.Although it addition, accuracy can be deteriorated, but it may also be assumed that certain proportion in the weight that measured of weight sensor 9a, 9b is the weight of vessel, thus calculating the weight of food oneself.
In the case, it is possible to save the time pre-registering vessel weight.Loading identifying unit 6 can calculate loading according to the food weight being achieved in that.Further, in the case, owing to loading can be judged before heating, so high-power heating can also be reinstated from the heating initial stage in the case of loading is big, in the case of loading is little, reinstates small-power from the heating initial stage heats.
In the loading judged in this wise above in the case of a small amount of, sometimes, although utilize infrared ray sensor 3 to determine temperature as described above, but owing to making infrared ray sensor 3 movable, therefore slowly, result caused heating in the renewal of temperature information.
In embodiments of the present invention, it is shortened by the movable required time of infrared ray sensor 3 and accelerates the renewal of temperature information, it is possible to prevent heating.
As explained using Fig. 2, it is not known that load is placed into which position in heating chamber 2, so at the heating initial stage, making infrared ray sensor 3 movable in the way of can measuring the temperature of the gamut in storehouse.But it is actually needed being limited in scope of being measured.Fig. 5 (A) shows that the load of the heating device in first embodiment of the present invention, Fig. 5 (B) show the Temperature Distribution in the heating chamber 2 of the heating device in first embodiment of the present invention.In storehouse, a2~b2 in a2~g2 scope, f2~g2 are the scopes not placing any object, and temperature DT1 now is ambient temperature.
On the other hand, b2~f2 is the temperature of more than ambient temperature DT1, but the scope that load instant food is c2~e2 of reality, b2~c2, e2~f2 are the vessel placing food.Therefore, c2~e2 be enough to the movable range as infrared ray sensor 3.
But, be actually difficult to according to temperature information judge c2~e2 be the temperature of food, b2~c2, e2~f2 be the temperature of the vessel placing food.
Therefore, in the present invention, the maximum temperature (DT3 of Fig. 5 (B)) of the temperature that detection infrared ray sensor 3 determines, movable part 4 detects in the range of the position (d2 of Fig. 5 (B)) of maximum temperature C movable comprising, so long as, it becomes possible to reliably movable in the scope comprise food temperature.
This movable range is not necessarily c2~e2, preferably little than c2~e2 comprising d2 scope.It addition, be not necessarily movable, it is possible to be fixed in the position of d2.So, the position of maximum temperature is to have electric wave easily to concentrate or the position of the characteristic such as load temperature easily rising, as long as so measuring the temperature of this position, it becomes possible to fully realized preventing of heating, it is possible to the heating that being processed property is good.
As mentioned above, by constituting the such structure of embodiment of the present invention, following heating device can be provided: at loading identifying unit 6, this heating device judges that loading is as time a small amount of, in than scope little when judging loading as volume movably, it is possible to shorten the time needed for detection, it is possible to prevent period of movement in the range of other from heating occurring.
Even if as it has been described above, the heating device of the present invention also is able to detect rapidly temperature at load in the case of a small amount of, it is possible to prevented heating, so being effective for middle heating devices used such as general families.

Claims (8)

1. a heating device, it possesses:
Microwave generation unit;
Heating chamber, its storage microwave carries out the load heated;
Infrared ray sensor, it measures the temperature of load non-contactly;
Movable part, its temperature measuring position making described infrared ray sensor movable and changing in described heating chamber;
Control unit, its temperature measured according to described infrared ray sensor and the information located control described microwave generation unit;And
Loading identifying unit, the loading in its described heating chamber of judgement,
Judge that loading is as time a small amount of at described loading identifying unit, the maximum temperature of the temperature that described control unit is measured, described movable part is movable in the range of following: than described loading identifying unit, this scope judges that loading is little as scope during volume and comprises the position being measured to maximum temperature.
Heating device the most according to claim 1, wherein,
Described temperature measuring position is fixed on described infrared ray sensor and is measured to the position of maximum temperature by described movable part.
Heating device the most according to claim 1, wherein,
This heating device has humidity sensor, the vapor volume in heating chamber described in this humidity sensor measuring,
The output of described humidity sensor after described loading identifying unit drives the described microwave generation unit stipulated time according to described control unit carrys out detection load amount.
Heating device the most according to claim 1, wherein,
The rate of change of the temperature that described loading identifying unit measures according to described infrared ray sensor carrys out detection load amount.
Heating device the most according to claim 1, wherein,
Described loading identifying unit judges loading by the weight of detection load.
Heating device the most according to claim 1, wherein,
Described control unit, in the case of the output of described microwave generation unit is big, before described loading identifying unit determines loading, reduces the output of described microwave generation unit, after judging to terminate, increases the output of described microwave generation unit.
Heating device the most according to claim 1, wherein,
Described loading identifying unit judge loading as in the case of a small amount of, described control unit reduces the output of described microwave generation unit.
Heating device the most according to claim 1, wherein,
After described movable part changes the movable range of infrared ray sensor, described control unit improves the output of described microwave generation unit.
CN201110432385.5A 2010-12-22 2011-12-21 Heating device Expired - Fee Related CN102538037B (en)

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JP6114530B2 (en) * 2012-10-16 2017-04-12 ルネサスエレクトロニクス株式会社 Display device and display device driver
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JP2017198400A (en) * 2016-04-28 2017-11-02 日立アプライアンス株式会社 High-frequency heating cooker
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