CN102235701A - Non-contact temperature measurement electromagnetic oven and temperature measuring method - Google Patents
Non-contact temperature measurement electromagnetic oven and temperature measuring method Download PDFInfo
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- CN102235701A CN102235701A CN2011100832786A CN201110083278A CN102235701A CN 102235701 A CN102235701 A CN 102235701A CN 2011100832786 A CN2011100832786 A CN 2011100832786A CN 201110083278 A CN201110083278 A CN 201110083278A CN 102235701 A CN102235701 A CN 102235701A
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Abstract
The invention discloses a non-contact temperature measurement electromagnetic oven and a temperature measuring method. The electromagnetic oven comprises an electromagnetic oven shell, an electromagnetic oven platen, a heating coil under the electromagnetic oven platen, a control circuit and a heating pot on the electromagnetic oven platen, as well as a magnetic temperature sensing element which is closely contacted with the bottom of the heating pot, a temperature measurement element which is arranged under the electromagnetic oven platen and corresponds to the magnetic temperature sensing element, wherein the temperature measurement element comprises a temperature measurement induction coil and a magnet exciting coil; the magnetic temperature sensing element is a ferromagnet or ferrimagnetics; a magnetic field of the magnetic temperature sensing element changes when the magnetic induction intensity of the magnetic temperature sensing element changes with temperature changes, by utilizing the temperature characteristics of the magnetic conductivity of the magnet and matching with the magnet exciting coil and the temperature measurement induction coil; and an electric signal of the corresponding temperature is generated when the change is reflected in the temperature measurement induction coil, and temperature detection and control are realized through the control circuit. According to the electromagnetic oven, the effect of automatic temperature control can be achieved, other set cooking functions can be realized, and the automatic degree of the electromagnetic oven is further improved.
Description
Technical field
The present invention relates to a kind of electromagnetic oven and temp measuring method, especially a kind of magnetic conductivity temperature characterisitic of utilizing iron or ferrimagnet, the electromagnetic oven and the temp measuring method of realization contactless temperature-measuring.
Background technology
Usually, about 160-170 ℃ of the oil temperature of fried food, if fried saturating food, about about 190 ℃ of oil temperature, experience show, and be warm at 50-90 ℃ when oil, has a small amount of bubble, the pasta calmness; When at 90-120 ℃, bubble collapse, pasta calmness; In the time of 120-170 ℃, the oil temperature sharply rises, and pasta is still tranquil; To 170-210 ℃, a small amount of blue or green cigarette is arranged, the oil meter face has a little ripplet; In case to 210-250 ℃, will form the blue or green cigarette that contains methacrylaldehyde in a large number, also produce the multiple poisonous substances such as thermopolymer, polycyclic aromatic hydrocarbon of grease, therefore, the temperature control in the process of cooking with oil is necessary, preferably with oily temperature control about 180 ℃.
In the prior art, electric cooker is another kind of temperature controlled exemplary, and still, electric cooker is being done the temperature control mode of rice, with above-mentioned oily temperature control have very big different because as long as the temperature control of rice is a bit, that is, be controlled at 103 ± 2 ℃, can realize cooking and being incubated.
The Japan Patent of Te Kaiping 10-125453 discloses the cooking pot that is heated that a kind of electromagnetic induction heating cooking pot uses, and in the document, the temperature-sensitive stainless steel is the material with Curie temperature.So, because the effect of Curie temperature, its magnetic can be changed to paramagnetic substance by the ferromagnetism body, when surpassing Curie temperature, because the magnetic metal material can be lost magnetic, permeability step-down, the caloric value of heater are that the border changes a lot with the Curie temperature, and its result can use Curie temperature to carry out temperature control, for example, when to use Curie temperature be 220 ℃ temperature-sensitive stainless steel temperature control, under any condition, the temperature of oil can be above 220 ℃ yet.
Publication number is that the Chinese patent of CN1887150 discloses a kind of electromagnetism pot that can send the magnetic signal of reflection variations in temperature, comprise heating kettle, fix at least one sensing magnet steel as the temperature signal generating device in the heating kettle bottom, the Curie temperature that can reach according to sensing magnet steel and send one to electromagnetic stove and lose the ferromagnetism signal, have simultaneously at electromagnetic stove under the situation of a magnetic induction part, make electromagnetic stove carry out the conversion of temperature control program according to the signal of sensing, change the situation of the necessary artificially controlling temperature of prior art electromagnetic stove, widened the purposes of electromagnetic stove and electromagnetism pot.
What above-mentioned prior art was utilized in fact only is the sudden change of the curie point front and back changing of magnetism of material, promptly can control a temperature spot by described curie point.
How to realize a wideer temperature range and continuous contactless temperature control, researcher of the present invention has made good try at CN101307924, the document a kind of electromagnetic oven that is provided with the magnetic induction temperature measuring equipment of openly knowing clearly, position near heater coil below described electromagnetic oven platen also is provided with the thermometric induction coil, be used for the magnetic signal that the magnetic temperature-sensing element above the electromagnetic oven platen produces on the temperature spot of setting is converted to the signal of telecommunication and output, and in the electromagnetic oven control circuit, set up temperature measurement circuit, this temperature measurement circuit mainly is made of thermometric induction coil and signal of telecommunication judging circuit.
But this case does not describe its control principle, and further research thinks that this technical scheme need can realize under a series of certain conditions.
How to realize a wideer temperature range and the continuous contactless temperature control of electromagnetic oven, and be illustrated that prior art does not provide any enlightenment from principle and mechanism.
In view of this, special proposition the present invention.
Summary of the invention
The technical problem to be solved in the present invention is to overcome the deficiencies in the prior art, and a kind of magnetic conductivity temperature characterisitic of utilizing iron or ferrimagnet is provided, and realizes the electromagnetic oven of contactless temperature-measuring.
Another object of the present invention is to provide the contactless temperature-measuring method of electromagnetic oven.
For solving the problems of the technologies described above, the present invention adopts the basic design of technical scheme to be: a kind of electromagnetic oven of contactless temperature-measuring, comprise the electromagnetic oven housing, the electromagnetic oven platen, the heater coil of electromagnetic oven platen below, control circuit and be positioned at heating kettle on the electromagnetic oven platen, also comprise a magnetic temperature-sensing element that bottom heating kettle, closely contacts, one is located at electromagnetic oven platen below and the corresponding temperature element in described magnetic temperature-sensing element position, temperature element comprises thermometric induction coil and magnet exciting coil, described magnetic temperature-sensing element is ferromagnet or ferrimagnet, utilize the temperature characterisitic of magnet magnetic conductivity, cooperate magnet exciting coil and thermometric induction coil, when the magnetic induction intensity of described magnetic temperature-sensing element varies with temperature and changes, the magnetic field of its generation changes, this variation is reflected in the signal of telecommunication that has just produced relevant temperature in the thermometric induction coil, realizes temperature detection and control by control circuit.
Noncontact of the present invention is meant between magnetic temperature-sensing element and the thermometric induction coil and does not contact.
Described thermometric induction coil and magnetic temperature-sensing element are arranged in the sphere of action of magnet exciting coil; The thermometric induction coil be arranged on can the regional extent of perception magnetic temperature-sensing element change of magnetic field strength in.
Described heater coil and described magnet exciting coil are same coil, and described thermometric induction coil is fixed on the below of electromagnetic oven platen by bracing frame, and to magnetropism temperature-sensing element position, bracing frame is that a longitudinal cross-section is step-like grillage.
Described thermometric induction coil, magnet exciting coil are fixed on the below of electromagnetic oven platen together by bracing frame, to magnetropism temperature-sensing element position, bracing frame is that a longitudinal cross-section is step-like grillage, and thermometric induction coil and magnet exciting coil are coaxial to be fixed on the grillage.
Described control circuit comprises the field circuit of power circuit, the output control circuit that is connected with power circuit, the work of control magnet exciting coil and the display circuit of output demonstration information, also comprise the temperature measurement circuit that is connected with output control circuit, described temperature measurement circuit comprises thermometric induction coil and signal of telecommunication judging circuit, the thermometric induction coil links to each other with signal of telecommunication judging circuit, and signal of telecommunication judging circuit is connected with output control circuit again.
Described temperature measurement circuit also comprises current rectifying and wave filtering circuit, and the alternate electrical signal that the thermometric induction coil produces becomes dc signal by after the current rectifying and wave filtering circuit, outputs to signal discrimination circuit.
Described thermometric induction coil is electromagnetic induction coil or Hall coil or Hall chip, perhaps is their any combination.
Described ferromagnet or ferrimagnet are meant any of iron, nickel, cobalt, gadolinium, dysprosium, or their alloys of combination arbitrarily, or ferrite.
Magnetic temperature-sensing element of the present invention has the μ-T curve of continuous decline in the operating temperature range of described electromagnetic oven, i.e. the temperature variant curve of magnetic conductivity, and the tangent line of any point of described curve and horizontal T axle have angle β, and described angle β is the obtuse angle.
Or have a μ-T curve of continuous rising, and the tangent line of any point of described curve and horizontal T axle have angle α, and described angle α is an acute angle.
The scope at β of the present invention angle is at the 100-170 degree, preferably at the 110-160 degree, and 110-140 degree more preferably; The scope at described α angle is at the 10-80 degree, preferably at the 15-75 degree, and 25-70 degree more preferably.
Corresponding different frequency or power preset a plurality of μ-T curve, the comparison other that adopts during thermometric and being equal to of presetting or the most approaching μ-T curve converts.
In fact, heating kettle size, shape and quality, and magnetic temperature-sensing element size, shape and quality also have very big influence to the measured temperature accuracy, a kind of simple way is, corresponding a kind of electromagnetism electromagnetic oven, the size, shape and the quality that are heated pot also are fixed up, and simultaneously, magnetic temperature-sensing element size, shape and quality also are fixed up.
Another kind of solution is, set magnetic temperature-sensing element size, shape and quality and the relation between electromagnetic heating coil and the thermometric induction coil are fixed up, and heating kettle one is to adopt the material that magnetic field is not had influence, the 2nd, adopt influence very little size, shape and quality.
The shielding ring that high magnetic permeability is set between heater coil, thermometric induction coil, magnetic temperature-sensing element is with blocking-up or reduce the influence of heater coil to thermometric induction coil, magnetic temperature-sensing element.
The temp measuring method of described electromagnetic oven is, during electromagnetic oven work, the magnet exciting coil energising, the temperature-sensitive that produces certain intensity detects magnetic field, when temperature-sensitive detects magnetic field by magnetic temperature-sensing element and thermometric induction coil, in the thermometric induction coil, produce the signal of telecommunication, when the temperature of magnetic temperature-sensing element during with the heating kettle variations in temperature, the magnetic intensity of magnetic temperature-sensing element changes, then the magnetic flux of thermometric induction coil is corresponding changes, and then cause the signal of telecommunication at thermometric induction coil two ends to change, because the different temperature points correspondence of magnetic temperature-sensing element the magnetic of varying strength, magnetic intensity changes, and temperature-sensitive detects the change in electric that magnetic field produces, and detects the temperature of heating kettle according to this signal of telecommunication correspondence.
Because the different temperature points correspondence of magnetic temperature-sensing element the magnetic of varying strength, can produce the corresponding signal of telecommunication in the thermometric induction coil simultaneously, a plurality of temperature spots are set in requirement according to the different cooking process of electromagnetic oven, the multi-point temp that the size of the signal of telecommunication that produces by the thermometric induction coil determines the magnetic temperature-sensing element changes, and realizes the automatic temperature-adjusting control of electromagnetic oven.
After adopting technique scheme, the present invention compared with prior art has following beneficial effect.
1. electromagnetic oven of the present invention adopts the contactless temperature-measuring device not only can utilize the Curie-point temperature of magnetic temperature-sensing element as the detected temperatures point, but also can utilize a plurality of programme controlled temperature spot of magnetic temperature-sensing element characteristic curve section, thereby satisfy more various culinary art requirement of electromagnetic oven as the setting of detected temperatures point.
2. electromagnetic oven of the present invention can design accurate automatic control program, not only can reach temperature automatically controlled effect, can also realize other cooking function of setting, has further improved the automaticity of electromagnetic oven.
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail.
Description of drawings
Fig. 1 is Fe
83Nb
6B
11The μ of alloy various specified temps in 370-660 ℃ of temperature range
i-T curve synoptic diagram;
Fig. 2 is that Fe-Cu-Nb-Si-B alloy magnetic conductivity and temperature relation change schematic diagram;
Fig. 3 is magnetization curve B-H and μ-H curved line relation schematic diagram;
Fig. 4 is magnetic conductivity and temperature relation μ-T curve synoptic diagram;
Fig. 5 and Fig. 6 are respectively that two kinds between magnetic susceptibility and the temperature concern schematic diagram;
Fig. 7 and Fig. 8 are respectively that two kinds between the intensity of magnetization and the temperature concern schematic diagram;
Fig. 9 is ferromagnetic typical μ of the present invention-T curve map, and wherein, a is a kind of ferromagnet of μ-T curve with continuous decline, and A is that curve is wherein and at the tangent line of this point; B is a kind of ferromagnet of μ-T curve with continuous rising, and B is that curve is wherein and at the tangent line of this point;
Figure 10 is the schematic diagram of the electromagnetic oven of the embodiment of the invention one;
Figure 11 is the electromagnetic oven control circuit principle schematic of the embodiment of the invention one.
The specific embodiment
Electromagnetic oven of the present invention is a kind of magnetic conductivity temperature characterisitic of utilizing iron or ferrimagnet, realizes the electromagnetic oven of contactless temperature-measuring.Parameters such as ferromagnet, ferrimagnet or ferritic magnetic conductivity (or magnetic induction intensity, the intensity of magnetization) and temperature have very complex relationship, they are subjected to the influence of the factors such as magnetic characteristic conversion before and after frequency, temperature, the curie point, specifically can be referring to the disclosure of the prior art of quoting below.
The 10th phase of " functional material " supplementary issue 2001 a kind of " Fe that openly knows clearly
83Nb
6B
11The alloy magnetic conductivity is with variation of temperature " the research article, from the document as can be seen, described alloy magnetic conductivity and temperature form complicated relation, even under different conditions, their coefficient of relationship has diverse trend, referring to accompanying drawing 1.
" Fe-Cu-Nb-Si-B alloy magnetic conductivity and temperature relation " (Acta Physica Sinica, the 10th phase of October in 1997) openly pointed out the most representative Fe
73.5Cu
1Nb
3Si
13.5B
9Alloy has embodied far different μ under different annealing temperatures
i-T curve, and further point out μ
iVariation with T mainly is by Ms, and the variation of K and λ s causes.Referring to accompanying drawing 2.
Periodically magnetic induction intensity also periodically changes symmetrically in the ac magnetization process of symmetry variation, its hysteresis curve shows as dynamic characteristic, if the constant situation of the amplitude of magnetizing field and improve frequency, then hysteresis curve gradually becomes oval, as can be seen, the frequency of the variation of external magnetic field intensity and external magnetic field has very big influence to ferromagnetic dynamic characteristic.
Fig. 3 is typical magnetization curve BH curve, and ferromagnetic common magnetization characteristics is: along with the increase of H, B increases slowly during beginning, and this moment, μ was less; Then just sharply increase with the increase B of H, μ also increases sharply; Increase with H at last, B trends towards saturated, (magnetic conductivity raises with the magnetic field intensity increase and the μ value of this moment sharply reduces after arriving maximum, when externally-applied magnetic field intensity surpasses certain limit value, magnetic conductivity sharply descends and is called magnetic saturation, material loses magnetic screen, and magnetic conductivity is high more easy more saturated), this accompanying drawing has shown that also magnetic conductivity μ is the function of magnetic field H.
Can see among Fig. 4 that magnetic conductivity μ still is the function of temperature, when temperature was elevated to certain value, ferromagnet was transformed into paramagnetic state by ferromagnetic state, was exactly Curie temperature T in the pairing temperature of curve catastrophe point
c
The interior field theory of Weiss points out that the internal field is that the size of molecular field is directly proportional with intensity of magnetization M, and when temperature was very low, Ms changed very little with T, and there is the spontaneous intensity of magnetization in ferromagnet (referring to Fig. 5) inside, when the low more spontaneous magnetization of temperature big more.Simultaneously, ferromagnetic magnetic susceptibility is king-sized positive number, at certain critical-temperature T
cBelow, even without externally-applied magnetic field, also can produce the spontaneous intensity of magnetization in the material.When temperature rose gradually, the unordered effect of warm-up movement was strengthened gradually, and spontaneous magnetization Ms reduces gradually, when temperature reaches T
cThe time, T
cBe Curie point, spontaneous magnetization acutely drops to zero, is transformed into paramagnet, and at this moment magnetic susceptibility is obeyed Curie's one weiss law: X=μ
0C/ (T-θ).Paramagnetic Curie point θ often with curie point T
cVery approaching, general θ＞T
cUsually, the Curie temperature of pure iron is 770 ℃, and pure nickel is 350 ℃.
The magnetic susceptibility of ferrimagnet (referring to Fig. 6) is lower than T in temperature
cThe time magnetic susceptibility so big not as ferromagnet, its spontaneous magnetization does not have ferromagnetic big yet, typical ferrimagnet material is a ferrite.Paramagnetic Curie point θ＜T
c, and often be negative value.
" measure the ferromagnetic material intensity of magnetization-temperature curve and curie point " in (" physics circular " with differential technique, 19620630) relation curve of several ferritic intensity of magnetization and temperature is disclosed, wherein, the sample of Fig. 7 is to use certain soft magnetic ferrite, and the sample of Fig. 8 is to use a branch of nickel.
The complexity of the magnetic conductivity temperature relation of ferromagnetic material has some idea of from above document, and known studies show that, magnetizing mediums generally can be divided into ferromagnet, paramagnetics and diamagnetism, and the magnetization rule of magnetizing mediums satisfies following relation: B=μ
o(1+X
m) H=μ
rμ
oH=μ H, wherein, B is a magnetic induction intensity, H is a magnetic field intensity, μ
rBe relative permeability, μ
oBe space permeability, μ is an absolute permeability, X
mBe magnetic susceptibility.Magnetic conductivity μ, the physical quantity of sign magnetizing mediums magnetic, normally used is the relative permeability μ of magnetizing mediums
r, it is defined as magnetic conductivity μ and space permeability μ
oThe ratio; The easy degree that in fact on behalf of magnetic material, magnetic conductivity be magnetized; In magnetized different phase, the magnetic conductivity of material is also different, magnetic conductivity is called maximum permeability at peak, magnetic conductivity in the magnetization starting point is called initial permeability, intensity of magnetization M, the physical quantity of description magnetizing mediums magnetized state is a vector, be defined as molecular magnetic moment m in the unit volume vector and, under the outside magnetic field effect, the magnetizing current that magnetizing mediums magnetization back occurs will produce complementary field, and it and external magnetic field sum are total magnetic field B, for linear isotropism magnetizing mediums, M and B, H is directly proportional, the M of paramagnetics and B, H is equidirectional, for ferromagnet, M and B, complicated non-linear relation is arranged between the H, constitute hysteresis curve.
In order to realize contactless magnetic induction temperature checking method of the present invention, need clear which type of magnetizing mediums characteristic of utilizing, could unique signal of telecommunication that draws utilizable variations in temperature.
As aforementioned, under the outside magnetic field effect, the magnetizing current that magnetizing mediums magnetization back occurs will produce complementary field, and it and external magnetic field sum are total magnetic field B, and the relation between total magnetic field and magnetic conductivity, magnetic susceptibility and the magnetic field intensity is, B=μ
o(1+X
m) H=μ
rμ
oH=μ H, if in a suitable range of temperature, complementary field, perhaps, total magnetic field B can have continuous variation by a relatively large margin thereupon, it is a prerequisite that realizes purpose of the present invention, this is because the amplitude that changes if total magnetic field or magnetic induction density B vary with temperature is bigger, just can allow induction coil, Hall coil or Hall element experience the variation of magnetic flux, just can produce the corresponding signal of telecommunication, this is one of basic ideas of the present invention.
μ
oBe that space permeability equals 1, if fixed magnetic field intensity H selects a kind of or several have by a relatively large margin the relative permeability μ that changes in specified for temperature ranges
rMagnetizing mediums, just may realize the invention, according to such research conclusion, disclosed multiple magnetizing mediums just can be utilized in the document of above-mentioned prior art.
Discover the μ of paramagnetics from above-mentioned
rBe slightly larger than 1, almost near μ
0, paramagnetics B and H satisfy linear relationship, B=μ
rμ
oH=μ H.The μ of nonferromagnetic material is approximately equal to μ
0And the magnetic conductivity of ferromagnetic material is very high, μ＞＞μ
0, therefore, ferromagnet, ferrimagnet comprise ferrite, are suitable.
According to above-mentioned, ferromagnet becomes paramagnetics after temperature rises to curie point, and the μ of paramagnetics
rBe slightly larger than 1, almost near μ
0, temperature is to magnetic induction intensity, and perhaps total magnetic field B no longer causes bigger variation, so the variation of the magnetic conductivity after the curie point is to realize purpose of the present invention.
After the ferromagnet magnetization, the magnetic field in medium significantly strengthens, and promptly has very strong and the equidirectional complementary field of external magnetic field after the magnetization, and its presentation is to introduce the material of experiencing strong attraction in the magnetic field, its stressed be about four or five thousand times of paramagnetics, ferromagnetic μ
r＞＞1, its numerical value almost is μ
010
3-10
4Doubly, iron, nickel, cobalt, gadolinium, dysprosium and alloy thereof and some nonmetallic ferrites all belong to this class.
The relative permeability μ of ferrimagnet
r=μ/μ
0As cast iron is 200～400; Silicon steel sheet is 7000～10000; Nickel-zinc ferrite is 10～1000; Dilval is 2000; Manganese-zinc ferrite is 300～5000; Permalloy is 20000～200000.The relative permeability of air is 1.00000004; Platinum is 1.00026; Diamagnetic substance, for example, mercury, silver, copper, carbon, plumbous relative permeability all less than but approach 1.
But, referring to accompanying drawing 4, this is a typical μ-T curve map, even before curie point, μ-T curve has also presented complicated variation, for example, before the curie point, about about 65 ℃ of first curve map in the accompanying drawing 1, about about 55 ℃ of second curve map in the accompanying drawing 1, about about 280 ℃ of first curve map in the accompanying drawing 2, presented a peak value or the lowest point,, two identical magnetic conductivity μ will under different temperatures, occur if utilize the material of μ-T curve with characteristic like this, when its signal was exported to signal discrimination circuit, which the temperature that can't judge described magnetic conductivity μ correspondence was actually.
Therefore, researcher of the present invention, following mode is can be used in to realize selecting a kind of ferromagnet in the technical scheme of the present invention, its μ-T curve, in operating temperature range, this curve presents a process that rises or descend continuously continuously.Described operating temperature is meant, room temperature to 210 ℃, and preferably 25-200 ℃, being more preferably is 30-180 ℃.
For example, the 4th, six, eight curve maps in the accompanying drawing 1 to about 500 ℃ scope, have just presented a kind of process of continuous decline in room temperature; And second curve map in the accompanying drawing 1 has presented a process that rises continuously in room temperature to about 55 ℃ scope, and still, this process obviously can not satisfy above-mentioned operating temperature range; In the process that presents continuous rising below 100 ℃, its slope and continuity are all better for the 4th curve map in the accompanying drawing 2 (590 ℃ of annealing temperatures), and still, its upper limit obviously can not satisfy described operating temperature for 100 ℃.
In sum, the ferromagnet or the ferrimagnet (comprising ferrite) that are fit to the magnetic temperature-sensing element 10 of use of the present invention should have accompanying drawing 9 described μ-T curves, in the described curve:
A is a kind of ferromagnet or the ferrimagnet of μ-T curve of having continuous decline in operating temperature range of the present invention, A be in this curve a bit and at the tangent line of this point, A tangent line and horizontal T axle have angle β, described angle β is the obtuse angle, its scope is at the 100-170 degree, preferably at the 110-160 degree, 110-140 degree more preferably;
B is a kind of ferromagnet or the ferrimagnet of μ-T curve of having continuous rising in operating temperature range of the present invention, B be in this curve a bit and at the tangent line of this point, B tangent line and horizontal T axle have angle α, described angle α is an acute angle, its scope is at the 10-80 degree, preferably at the 15-75 degree, 25-70 degree more preferably.
After having set above-mentioned condition, during magnet exciting coil work, can form an alternating magnetic field, simultaneously the magnetic temperature-sensing element is carried out excitation, between thermometric induction coil and magnetic temperature-sensing element, form a temperature-sensitive and detect magnetic field, be used for the magnetic signal that the magnetic temperature-sensing element produces under different temperatures is converted to the signal of telecommunication and output, when the heating kettle variations in temperature, the temperature of the magnetic temperature-sensing element that is in contact with it changes thereupon, its magnetic induction intensity changes thereupon, and described variation is reflected in temperature-sensitive and detects the signal of telecommunication that has just produced relevant temperature in the magnetic field, passes through signal discrimination circuit, and control circuit, realize temperature controlling to heating kettle.
Electromagnetic oven of the present invention is provided with control circuit, comprise the field circuit of power circuit, the output control circuit that is connected with power circuit, the work of control magnet exciting coil and the display circuit of output demonstration information, also comprise the temperature measurement circuit that is connected with output control circuit, described temperature measurement circuit comprises thermometric induction coil and signal of telecommunication judging circuit, the thermometric induction coil links to each other with signal of telecommunication judging circuit, signal of telecommunication judging circuit is connected with output control circuit again, makes the control program of electromagnetic oven make corresponding conversion.In the present invention, described field circuit mainly is made up of magnet exciting coil, described field circuit can carry out excitation to the thermometric induction coil, between thermometric induction coil and magnetic temperature-sensing element, form one and detect magnetic field, be used for the magnetic signal that the magnetic temperature-sensing element of heating kettle produces on the temperature spot of setting is converted to the signal of telecommunication and output, so just can detect the temperature of heating kettle.
Its operation principle is: magnet exciting coil energising, produce certain intensity alternating magnetic field, be that temperature-sensitive detects magnetic field, alternating magnetic field produces alternating voltage, electric current during by magnetic temperature-sensing element and thermometric induction coil in the thermometric induction coil, promptly produce the signal of telecommunication.When the temperature of magnetic temperature-sensing element during with the heating kettle variations in temperature, the magnetic intensity of magnetic temperature-sensing element changes, then the magnetic flux of thermometric induction coil changes with regard to corresponding, and then cause the voltage or the signals of telecommunication such as electric current, pulse width at thermometric induction coil two ends to change, hence one can see that, the alternating voltage of thermometric induction coil or the size of the signals of telecommunication such as electric current, pulse width are influenced by the height of heating kettle temperature can, and can exist a temperature-sensitive to detect the zone in magnetic field near magnet exciting coil.Therefore, under the situation of operate as normal,, just can detect the variations in temperature of magnetic temperature-sensing element by detecting the size of the signal of telecommunication that the thermometric induction coil produces.Because the different temperature points correspondence of magnetic temperature-sensing element the magnetic of varying strength, can produce the corresponding signal of telecommunication in the thermometric induction coil simultaneously, so can also set a plurality of temperature spots according to the requirement of the different cooking process of electromagnetic oven, the multi-point temp that determines the magnetic temperature-sensing element by the size that detects the signal of telecommunication that the thermometric induction coil produces changes, thereby realizes the automatic control of electromagnetic oven.
Thermometric induction coil of the present invention is positioned near magnet exciting coil and the magnetic temperature-sensing element, can produce temperature-sensitive detects in the zone in magnetic field just passable, because only in temperature-sensitive detected the zone in magnetic field, magnet exciting coil, thermometric induction coil and magnetic temperature-sensing element could interact.
The magnetic temperature-sensing element that magnetic temperature-sensing element of the present invention can be a Ferrite Material; Described magnetic temperature-sensing element can also be a sensing magnet steel, as the sensing magnet steel of non-crystalline material or the sensing magnet steel of nanocrystalline material; The magnetic temperature-sensing element that described magnetic temperature-sensing element can also be an alloy material, or the magnetic temperature-sensing element of rare earth material.
Signal of telecommunication judging circuit of the present invention can be voltage judging circuit or current judgement circuit, or other signals of telecommunication such as judging circuits such as frequency, pulse width, as: voltage comparator circuit, A/D circuit, pulse width measurement circuit etc.
The present invention can do following improvement, and described temperature measurement circuit can also comprise current rectifying and wave filtering circuit, and the alternate electrical signal that the thermometric induction coil produces can become dc signal by after the current rectifying and wave filtering circuit, outputs to signal discrimination circuit.
During electromagnetic oven work, the alternate electrical signal that described thermometric induction coil produces, produce DC voltage or DC current as voltage or electric current through current rectifying and wave filtering circuit, after DC voltage or DC current were input to voltage or current judgement circuit, voltage or current judgement circuit just can determine the size of DC voltage or electric current.Because the size of the signal of telecommunication is the influence that is subjected to the magnetic intensity size of magnetic temperature-sensing element, magnetic is strong more, and the signal of telecommunication is big more, and magnetic is weak more, and the signal of telecommunication is more little.The magnetic intensity size of magnetic temperature-sensing element is again the influence that is subjected to the temperature height of heating kettle, therefore, described magnetic induction temperature measurement circuit can determine the height of heating kettle temperature, the relation of the temperature and the signal of telecommunication has two kinds of positive temperature coefficient relation and negative temperature coefficient relations, the positive temperature coefficient relation, be that temperature is high more, the signal of telecommunication is strong more, the negative temperature coefficient relation, be that temperature is high more, the signal of telecommunication is weak more, and when for example the temperature of heating kettle reached a certain temperature, magnitude of voltage changed to a certain magnitude of voltage X volt, when being 105 ℃ as a certain temperature, this temperature is the meal temperature of boiling just, therefore, this temperature spot is set can be used for realizing the electromagnetic oven temp sensing function of cooking automatically.In like manner, described temperature measurement circuit can determine the variation of a plurality of temperature spots of heating kettle, makes control program make corresponding conversion, thereby satisfies other culinary art requirement of electromagnetic oven.
Embodiment one
Present embodiment illustrates contactless temperature-measuring method of the present invention with electromagnetic oven thermometric process.Referring to accompanying drawing 10,11.
The described electromagnetic oven of present embodiment comprises: electromagnetic oven housing 2, electromagnetic oven platen 3, heater coil 4 and control circuit, described control circuit comprises control panel 1 and drive plate 8, the central authorities of heater coil 4 are provided with bracing frame 5, on this bracing frame 5 thermistor 7 are housed.
The electromagnetic oven control circuit comprises power circuit, output control circuit, current detection circuit, temperature protection circuit, output regulating circuitry, display circuit and holding circuit etc.; also comprise temperature measurement circuit; described temperature measurement circuit comprises thermometric induction coil and signal of telecommunication judging circuit; the thermometric induction coil links to each other with signal of telecommunication judging circuit; signal of telecommunication judging circuit is connected with output control circuit again, makes the control program of electromagnetic oven make corresponding conversion.
In the present embodiment, the electromagnetic induction principle that adopts is realized contactless temperature-sensitive method of the present invention, its basic principle is, because of magnetic flux change produces induced electromotive force, that is, and when the magnetic induction intensity of described magnetic temperature-sensing element varies with temperature and when changing, the magnetic field of its generation changes, magnetic force line cutting is done to the thermometric induction coil, the curtage signal that will change in the thermometric induction coil in the magnetic field that changes
Concrete, when electromagnetic oven was worked, the alternating magnetic field that heater coil 4 produces certain intensity heated culinary art heating kettle 9, and simultaneously, described alternating magnetic field acts on magnetic temperature-sensing element 10 and thermometric induction coil simultaneously.
When described alternating magnetic field is worked with certain parameter, it acts on the thermometric induction coil separately and the amplitude of the signal of telecommunication that produces is therein fixed, what no matter gather is voltage, current signal, and has formed basic telecommunications number in described thermometric induction coil.
Alternating magnetic field described herein is meant (can certainly adopt independently magnet exciting coil) that the heater coil 4 of electromagnetic oven produces, in the present embodiment, described heater coil 4 is the heater coil of electromagnetic oven, also is the magnet exciting coil of magnetic temperature-sensing element 10 and thermometric induction coil.
Variations in temperature along with culinary art heating kettle 9, the temperature of magnetic temperature-sensing element 10 changes thereupon, it is changed by the magnetic induction density B of magnet exciting coil excitation thereupon, number stack of the signal of telecommunication that the magnetic field that changes produces in the thermometric induction coil and basic telecommunications forms the real-time output signal of telecommunication that changes, the described real-time output signal of telecommunication is differentiated in signal of telecommunication judging circuit, and realize the temperature that sets is done conversion operations, thereby realize automatic control to the electromagnetic oven cooking process by output control circuit.
Embodiment two
In the present embodiment, other are identical with embodiment one, different is, magnetic temperature-sensing element 10 is embedded on the table top and culinary art heating kettle 9 position contacting, thermometric induction coil and its substantially over against be placed under the table top, a magnet exciting coil independently is set, regular when cutting off heater coil, carry out temperature survey.Described thermometric induction coil, magnet exciting coil are fixed on the below of electromagnetic oven platen together by support 5a, to magnetropism temperature-sensing element position, support 5a is that a longitudinal cross-section is step-like grillage, and thermometric induction coil and magnet exciting coil are coaxial to be fixed on the grillage.
Embodiment three
Other are identical with embodiment one, different is, the described thermometric induction coil 6 of present embodiment, what adopt is Hall element, concretely, present embodiment has adopted the Hall element that the utilizes Hall effect preparation thermometric induction coil as contactless temperature-measuring method of the present invention, concrete: the rectangular tab that adopts uniform N-type semiconductor material to make, described thin slice has certain length and width, thick, two ends at length direction add voltage, and the position of described Hall element is in the effective range in magnetic temperature-sensing element 10 magnetic fields.
When causing magnetic field B under variation of temperature, magnetic temperature-sensing element 10 changes, be basically perpendicular to the variation of the magnetic field B of wide of Hall element, caused the two ends of width of the thin slice of described Hall element to produce potential difference, then described potential difference is transformed into the signal of telecommunication, handles according to the mode of embodiment one.
Embodiment four
Present embodiment explanation be, in case of necessity, can carry out necessary shielding to thermometric induction coil 6, described shielding can be adopted the mode of prior art, for example:
" difficult problem-magnetic field shielding in the electromagnetic shielding " (the 10th phase of electron mass 2006) discloses low frequency magnetic field and (referred to be lower than the alternating magnetic field of 100kHz, and the operating frequency of family expenses electromagnetic oven is within 20-30KHz) can adopt the high magnetic permeability shield magnetic flux to be shunted and the effect that realizes shielding, the magnetic induction intensity of high magnetic permeability shield inside is much larger than the magnetic induction intensity of outside, simultaneously, the outside magnetic line of force is almost vertical with the ferromagnetic material surface, most of low frequency magnetic field energy is constrained in the shield, plays shielding action.The mode of Shi Yonging is the described low frequency magnetic field shielding mode based on bypath principle of this article more, improves bypass efficient, can make the as far as possible little magnetic circuit that makes of shield short as far as possible, increases the sectional area and the material that uses high magnetic permeability of magnetic circuit.
Certainly, can improve according to requirement of the present invention, for example, as the installation site change, or part is uncovered, carries out partly shielding effect.
Embodiment in the foregoing description can further make up or replace; and embodiment is described the preferred embodiments of the present invention; be not that design of the present invention and scope are limited; under the prerequisite that does not break away from design philosophy of the present invention; the various changes and modifications that the professional and technical personnel makes technical scheme of the present invention in this area all belong to protection scope of the present invention.
Claims (10)
1. the electromagnetic oven of a contactless temperature-measuring, comprise the electromagnetic oven housing, the electromagnetic oven platen, the heater coil of electromagnetic oven platen below, control circuit and be positioned at heating kettle on the electromagnetic oven platen, it is characterized in that: also comprise a magnetic temperature-sensing element that bottom heating kettle, closely contacts, one is located at electromagnetic oven platen below and the corresponding temperature element in described magnetic temperature-sensing element position, temperature element comprises thermometric induction coil and magnet exciting coil, described magnetic temperature-sensing element is ferromagnet or ferrimagnet, utilize the temperature characterisitic of magnet magnetic conductivity, cooperate magnet exciting coil and thermometric induction coil, when the magnetic induction intensity of described magnetic temperature-sensing element varies with temperature and changes, the magnetic field of its generation changes, this variation is reflected in the signal of telecommunication that has just produced relevant temperature in the thermometric induction coil, realizes temperature detection and control by control circuit.
2. the electromagnetic oven of a kind of contactless temperature-measuring according to claim 1, it is characterized in that: described thermometric induction coil and magnetic temperature-sensing element are arranged in the sphere of action of magnet exciting coil; The thermometric induction coil be arranged on can the regional extent of perception magnetic temperature-sensing element change of magnetic field strength in.
3. the electromagnetic oven of a kind of contactless temperature-measuring according to claim 1, it is characterized in that: described heater coil and described magnet exciting coil are same coil, described thermometric induction coil is fixed on the below of electromagnetic oven platen by support, to magnetropism temperature-sensing element position, support is that a longitudinal cross-section is step-like grillage.
4. the electromagnetic oven of a kind of contactless temperature-measuring according to claim 1, it is characterized in that: described thermometric induction coil, magnet exciting coil are fixed on the below of electromagnetic oven platen together by support, to magnetropism temperature-sensing element position, support is that a longitudinal cross-section is step-like grillage, and thermometric induction coil and magnet exciting coil are coaxial to be fixed on the grillage.
5. the electromagnetic oven of a kind of contactless temperature-measuring according to claim 1, it is characterized in that: described control circuit comprises the field circuit of power circuit, the output control circuit that is connected with power circuit, the work of control magnet exciting coil and the display circuit of output demonstration information, also comprise the temperature measurement circuit that is connected with output control circuit, described temperature measurement circuit comprises thermometric induction coil and signal of telecommunication judging circuit, the thermometric induction coil links to each other with signal of telecommunication judging circuit, and signal of telecommunication judging circuit is connected with output control circuit again.
6. the electromagnetic oven of a kind of contactless temperature-measuring according to claim 5, it is characterized in that: described temperature measurement circuit also comprises current rectifying and wave filtering circuit, the alternate electrical signal that the thermometric induction coil produces becomes dc signal by after the current rectifying and wave filtering circuit, outputs to signal discrimination circuit.
7. the electromagnetic oven of a kind of contactless temperature-measuring according to claim 1, it is characterized in that: described thermometric induction coil is electromagnetic induction coil or Hall coil or Hall chip, perhaps is their any combination.
8. the electromagnetic oven of a kind of contactless temperature-measuring according to claim 1 is characterized in that: described ferromagnet or ferrimagnet are meant any of iron, nickel, cobalt, gadolinium, dysprosium, or their alloys of combination arbitrarily, or ferrite.
One kind as on the claim 8 arbitrary as described in the temp measuring method of electromagnetic oven, it is characterized in that: during electromagnetic oven work, the magnet exciting coil energising, the temperature-sensitive that produces certain intensity detects magnetic field, when temperature-sensitive detects magnetic field by magnetic temperature-sensing element and thermometric induction coil, in the thermometric induction coil, produce the signal of telecommunication, when the temperature of magnetic temperature-sensing element during with the heating kettle variations in temperature, the magnetic intensity of magnetic temperature-sensing element changes, then the magnetic flux of thermometric induction coil is corresponding changes, and then cause the signal of telecommunication at thermometric induction coil two ends to change, because the different temperature points correspondence of magnetic temperature-sensing element the magnetic of varying strength, magnetic intensity changes, and temperature-sensitive detects the change in electric that magnetic field produces, and detects the temperature of heating kettle according to this signal of telecommunication correspondence.
10. temp measuring method according to claim 9, it is characterized in that: because the different temperature points correspondence of magnetic temperature-sensing element the magnetic of varying strength, can produce the corresponding signal of telecommunication in the thermometric induction coil simultaneously, a plurality of temperature spots are set in requirement according to the different cooking process of electromagnetic oven, the multi-point temp that the size of the signal of telecommunication that produces by the thermometric induction coil determines the magnetic temperature-sensing element changes, and realizes the automatic temperature-adjusting control of electromagnetic oven.
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| CN2011100832786A CN102235701A (en) | 2010-03-31 | 2011-03-25 | Non-contact temperature measurement electromagnetic oven and temperature measuring method |
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| CN201010136771 | 2010-03-31 | ||
| CN201010136771.5 | 2010-03-31 | ||
| CN2011100832786A CN102235701A (en) | 2010-03-31 | 2011-03-25 | Non-contact temperature measurement electromagnetic oven and temperature measuring method |
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| CN103512061A (en) * | 2012-06-18 | 2014-01-15 | 珠海格力电器股份有限公司 | System for measuring placement position of pot on induction cooker and induction cooker |
| CN105916421A (en) * | 2014-02-25 | 2016-08-31 | 松下知识产权经营株式会社 | Blade body, container having blade body attached, and heat-cooking apparatus |
| CN106028491A (en) * | 2016-07-22 | 2016-10-12 | 深圳市鑫汇科股份有限公司 | Electromagnetic induction heating device |
| CN107028476A (en) * | 2016-02-04 | 2017-08-11 | 张勇涛 | A kind of Curie's cooking apparatus for the sensing that suspends |
| WO2018006873A1 (en) * | 2016-07-08 | 2018-01-11 | 肇庆市天宇进出口贸易有限公司 | Induction cooker electromagnetic heating control system and control method thereof |
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| CN109100037A (en) * | 2018-07-25 | 2018-12-28 | 南京磊智电子科技有限公司 | Applied to the cooking bottom temperature measurement method of electromagnetic oven, apparatus and system |
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| CN103512061B (en) * | 2012-06-18 | 2016-01-20 | 珠海格力电器股份有限公司 | System for measuring placement position of pot on induction cooker and induction cooker |
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| CN106028491A (en) * | 2016-07-22 | 2016-10-12 | 深圳市鑫汇科股份有限公司 | Electromagnetic induction heating device |
| CN108414110A (en) * | 2018-02-09 | 2018-08-17 | 陈景超 | Induction temperature sensing device and temp measuring method, cooker and calutron |
| CN109100037A (en) * | 2018-07-25 | 2018-12-28 | 南京磊智电子科技有限公司 | Applied to the cooking bottom temperature measurement method of electromagnetic oven, apparatus and system |
| CN111385925A (en) * | 2018-12-29 | 2020-07-07 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic cooking appliance and control method thereof |
| CN111385925B (en) * | 2018-12-29 | 2022-04-19 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic cooking appliance and control method thereof |
| CN113654677A (en) * | 2020-05-12 | 2021-11-16 | 佛山市顺德区美的电热电器制造有限公司 | Heating temperature measuring circuit, temperature detecting method thereof, cooking device and storage medium |
| CN113654677B (en) * | 2020-05-12 | 2023-11-03 | 佛山市顺德区美的电热电器制造有限公司 | Heating temperature measuring circuit, temperature detecting method thereof, cooking device and storage medium |
| CN113820031A (en) * | 2020-12-11 | 2021-12-21 | 中冶长天国际工程有限责任公司 | Online temperature measuring method for direct reduction process of iron ore |
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Application publication date: 20111109 |