CN103462482A - Inductively heating type rice cooker - Google Patents
Inductively heating type rice cooker Download PDFInfo
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- CN103462482A CN103462482A CN 201310218416 CN201310218416A CN103462482A CN 103462482 A CN103462482 A CN 103462482A CN 201310218416 CN201310218416 CN 201310218416 CN 201310218416 A CN201310218416 A CN 201310218416A CN 103462482 A CN103462482 A CN 103462482A
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Abstract
The invention provides an inductively heating type rice cooker. During a first half procedure, rice is soaked in water with the temperature thereof lower then the rice gelatinization temperature of the rice, and a high-frequency current is applied onto a heating coil (5) by means of an inverter (7) according to the temperature detected by a temperature detection part (9). In this way, a pot is kept at a predetermined temperature. During a second half procedure, no high-frequency current is applied onto the heating coil, so that elements in the inverter are cooled. Therefore, the highest temperature of the elements in the inverter after the rice soaking process is no larger than an allowable upper limit.
Description
Technical field
The eddy-current heating cooker used such as the present invention relates in average family, restaurant.
Background technology
In eddy-current heating cooker in the past, be known to following eddy-current heating cooker: overheat owing to applying the switch element used in the inverter of high frequency electric to heater coil, therefore, cooling fan is installed and is forced cooling to this switch element.
But, in the eddy-current heating cooker in the past as above formed like this, the motion and sound of cooling fan is large, for example, quietly in situation, can hear the wind noise of cooling fan in the morning or around late into the night etc., this likely becomes the obstacle of sleep.
Therefore, the eddy-current heating cooker of following structure has been proposed: the heat storage unit of being accumulated by the heat radiation that the switch element to using in inverter is set, and do not need cooling fan (for example,, with reference to patent documentation 1).
Patent documentation 1: Japanese kokai publication hei 10-117926 communique
But, in above-mentioned such eddy-current heating cooker in the past that does not need cooling fan, there is heat storage unit owing to being configured to, therefore exist the size of eddy-current heating cooker and weight to increase, diminish the handlability of eddy-current heating cooker and the problem of taking in property.In addition, because the eddy-current heating cooker has heat storage unit, the problem that therefore exists manufacturing cost to rise.
Summary of the invention
The present invention is intended to solve above-mentioned problem in the past, its purpose is, a kind of eddy-current heating cooker is provided, this eddy-current heating cooker can be in the situation that do not increase size, weight and the manufacturing cost of eddy-current heating cooker, to the element used in inverter, carry out cooling, improve handlability and taking in property, and can maintain the higher performance of cooking.
In order to solve the problem in above-mentioned eddy-current heating cooker in the past, eddy-current heating cooker of the present invention has: the cooker main body, pot, it is accommodated in described cooker main body in the mode that can freely load and unload, heater coil, it produces the induced field that described pot is heated, inverter, its action by element applies high frequency electric to described heater coil, control part, the described heater coil of its subtend applies the described inverter of high frequency electric and is controlled, and the pot temperature test section, it detects the temperature of described pot, described control part is configured to: in the first half term of the immersion process in rice is immersed in to the water lower than rice gelatinization point, detected temperatures according to described pot temperature test section, apply high frequency electric by described inverter to described heater coil, so that described pot becomes predetermined soaking temperature, in the second half of described immersion process, stop the high frequency electric applying to described heater coil by described inverter, make the described element in described inverter cooling, so that the maximum temperature produced in the process of described element after this immersion process in described inverter is the temperature that is no more than the high limit of tolerance temperature of this element.
Eddy-current heating cooker of the present invention can be in the situation that do not increase size, weight and the manufacturing cost of eddy-current heating cooker, to the element used in inverter, carry out cooling, can, when maintaining the performance of cooking of eddy-current heating cooker, improve handlability and taking in property.
The accompanying drawing explanation
Fig. 1 is the longitudinal section of structure that the eddy-current heating cooker of embodiments of the present invention 1 is shown.
Fig. 2 is the circuit diagram that schematically shows the eddy-current heating cooker of embodiments of the present invention 1.
Fig. 3 is the procedure chart of cooking of the eddy-current heating cooker of embodiments of the present invention 1.
Label declaration
1 cooker main body; 2 pots; 3 lids; 4 inner caps; 5 heater coils; 7 inverters; 8 control parts; 9 pot temperature test sections; 10 bearer bars; 202 diode bridges; 203 choking-windings; 204 smoothing capacitors; 205 switch elements; 206 resonant capacitors; 207 current detecting parts; 208 component temperature test sections.
The specific embodiment
The eddy-current heating cooker of the 1st mode of the present invention has: the cooker main body, pot, it is accommodated in described cooker main body in the mode that can freely load and unload, heater coil, it produces the induced field that described pot is heated, inverter, its action by element applies high frequency electric to described heater coil, control part, the described heater coil of its subtend applies the described inverter of high frequency electric and is controlled, and pot temperature test section, it detects the temperature of described pot, described control part is configured to: in the first half term of the immersion process in rice is immersed in to the water lower than rice gelatinization point, detected temperatures according to described pot temperature test section, apply high frequency electric by described inverter to described heater coil, so that described pot becomes predetermined soaking temperature, in the second half of described immersion process, stop the high frequency electric applying to described heater coil by described inverter, make the described element in described inverter cooling, so that the maximum temperature produced in the process of described element after this immersion process in described inverter is the temperature that is no more than the high limit of tolerance temperature of this element.
In the eddy-current heating cooker of the 1st mode of the present invention as above formed like this, in immersion process, rice is immersed in the water lower than rice gelatinization point, make in advance rice water suction, at immersion process in later process, fully gelatinization until meter central part, for this reason, in during predetermined soak time, pot is carried out to adjustment, make temperature lower than the rice gelatinization point.
In the 1st immersion process of the first half term as immersion process, predetermined soaking temperature is set as to the temperature lower than rice gelatinization point, make the rice water suction in pot.In addition, in the 2nd immersion process of the second half as immersion process, stop applying high frequency electric to heater coil, thermal capacitance due to pot makes temperature descend lentamente thus, but, so long as stop in short time applying, can maintain lower than rice gelatinization point and can not affect in the temperature range of the performance of cooking.Therefore, in the second half of immersion process, when the element that can use is cooling, make the rice water suction in making inverter.
For example, as the temperature of the switch element of the element used in inverter, in the process of cooking of the long process that boils of the time that applies high frequency electric to heater coil and boiling maintenance process, reach maximum temperature.But, in eddy-current heating cooker of the present invention, can reduce the element that uses in inverter when immersion process finishes, the arrival temperature of the process of boiling while starting, can reduce the maximum temperature of element in the process of boiling and boiling maintenance process.
Therefore, can make the element in inverter cooling in the situation that do not increase size, weight and the manufacturing cost of eddy-current heating cooker, can, when maintaining the performance of cooking of eddy-current heating cooker, improve handlability and taking in property.
The eddy-current heating cooker of the 2nd mode of the present invention is in described the 1st mode, this eddy-current heating cooker also has the component temperature test section that the temperature to the described element in described inverter is detected, described control part is configured to: in the second half of described immersion process, stop the high frequency electric applying to described heater coil by described inverter, until the detected temperatures of described component temperature test section becomes below the cooling maximum temperature of predetermined element, when the detected temperatures of described component temperature test section reaches the cooling maximum temperature of predetermined element, proceed to ensuing process.
In the eddy-current heating cooker of the 2nd mode of the present invention as above formed like this, in immersion process, be provided with make this element cooling during, in the 2nd immersion process of the second half as immersion process, stop applying high frequency electric to heater coil, until the detected temperatures of component temperature test section reaches below the cooling maximum temperature of predetermined element.Therefore, the eddy-current heating cooker of the 2nd mode of the present invention can be suppressed at the maximum temperature in the boiling maintenance process the boil process of element after immersion process of using in inverter below the high limit of tolerance temperature of the storage temperature of this element and the ceiling temperature of all size etc., the security that can improve the eddy-current heating cooker.
The eddy-current heating cooker of the 3rd mode of the present invention is in described the 2nd mode, and the cooling maximum temperature of described predetermined element is described element in described inverter in the situation that the maximum temperature produced in the process after described immersion process is temperature, the temperature described element of described immersion process while finishing that is no more than the high limit of tolerance temperature of this element.
In the eddy-current heating cooker of the 3rd mode of the present invention as above formed like this, temperature when utilizing element that the calculating such as experiment and simulation are used in inverter the process of boiling starting when immersion process finishes, so that the maximum temperature of this element in the process that boils of the ensuing process as after immersion process and boiling maintenance process is no more than the high limit of tolerance temperature of the storage temperature of this element and the ceiling temperature of all size etc., using the data that calculate like this as the cooling maximum temperature of predetermined element, pre-stored in control part.
The eddy-current heating cooker of the 3rd mode of the present invention, in the 2nd immersion process of the second half as immersion process, stops applying high frequency electric to heater coil, until the detected temperatures of component temperature test section reaches below the cooling maximum temperature of element.In the process that boils that the eddy-current heating cooker of the 3rd mode of the present invention formed like this can proceed to after immersion process or boiling maintenance process, the element used in inverter is suppressed at below the high limit of tolerance temperature of ceiling temperature etc. of its storage temperature and all size to the security that can improve the eddy-current heating cooker.
The eddy-current heating cooker of the 4th mode of the present invention is in described the 3rd mode, described element in described inverter is switch element, process after described immersion process is to apply the process that boils and the boiling maintenance process of high frequency electric to described heater coil by described inverter, the cooling maximum temperature of the described predetermined element for described switch element when described immersion process finishes is set to, and makes the maximum temperature of described switch element in described boil process or described boiling maintenance process be no more than the high limit of tolerance temperature of this switch element.
The eddy-current heating cooker of the 4th mode of the present invention as above formed like this is in the 2nd immersion process of the second half as immersion process, stop applying high frequency electric to heater coil, until the detected temperatures of switch element reaches below the cooling maximum temperature of predetermined element.In the process that boils that the eddy-current heating cooker of the 4th mode of the present invention formed like this can proceed to after immersion process or boiling maintenance process, the temperature of switch element is suppressed at below the high limit of tolerance temperature of ceiling temperature etc. of its storage temperature and all size to the security that can improve the eddy-current heating cooker.
The eddy-current heating cooker of the 5th mode of the present invention is in described the 1st mode, described control part is configured to: until in the cooling minimum time of predetermined element during the end of the second half of described immersion process, stop the high frequency electric applying to described heater coil by described inverter, make described element cooling.
The eddy-current heating cooker of the 5th mode of the present invention as above formed like this is in the 2nd immersion process of the second half as immersion process, and the high frequency electric that stops applying to heater coil, utilize the cooling temperature that reduces the element used in inverter of nature.Utilize experiment and simulation etc. to calculate in advance until immersion process is when the process of boiling starts while finishing, natural cool time switch element, so that the maximum temperature in the process that boils of switch element immersion process after and the maintenance process that seethes with excitement is no more than the high limit of tolerance temperature such as ceiling temperature of storage temperature and all size of switch element.Using the data that calculate like this as the cooling minimum time of predetermined element, pre-stored in control part.
The eddy-current heating cooker of the 5th mode of the present invention is in the 2nd immersion process of the second half as immersion process, in during the cooling minimum time of predetermined element, the high frequency electric that stops applying to heater coil, thus, in the process that boils proceeded to and boiling maintenance process, the element used in inverter can be suppressed to the ceiling temperature etc. of storage temperature and all size below the high limit of tolerance temperature after immersion process.Consequently, the eddy-current heating cooker of the 5th mode of the present invention can improve reliability and security.
The eddy-current heating cooker of the 6th mode of the present invention is in described the 5th mode, the cooling minimum time of described predetermined element is until be set so that the maximum temperature produced in the process of described element after described immersion process in described inverter becomes the temperature of the high limit of tolerance temperature that is no more than this element the cool time of the described element of described immersion process while finishing.
In the eddy-current heating cooker of the 6th mode of the present invention as above formed like this, utilize experiment and simulation etc. to calculate until immersion process is while finishing, cooling period this element, the high limit of tolerance temperature such as ceiling temperature that make the element that uses in inverter be no more than storage temperature and all size of this element in the process that boils and the maximum temperature in the maintenance process that seethes with excitement of the ensuing process as immersion process after.Using the data that calculate like this as the cooling minimum time of predetermined element, pre-stored in control part.
During the cooling minimum time of predetermined element of the eddy-current heating cooker of the 6th mode of the present invention in the 2nd immersion process of the second half as immersion process, stop applying high frequency electric to heater coil.The eddy-current heating cooker of the 6th mode of the present invention formed like this can proceed to after soaking operation boils during operation and boiling maintain operation, the element used in inverter is suppressed to the ceiling temperature etc. of its storage temperature and all size below the high limit of tolerance temperature, can improves the security of eddy-current heating cooker.
The eddy-current heating cooker of the 7th mode of the present invention is in described the 6th mode, described element in described inverter is switch element, process after described immersion process is to apply the process that boils and the boiling maintenance process of high frequency electric to described heater coil by described inverter, until the described predetermined element cooling minimum time of described immersion process while finishing is set so that the maximum temperature of described switch element in described boil process and described boiling maintenance process is no more than the high limit of tolerance temperature of this switch element.
The eddy-current heating cooker of the 7th mode of the present invention as above formed like this in the 2nd immersion process of the second half as immersion process, during the cooling minimum time of predetermined element in, stop applying high frequency electric to heater coil.In the process that boils that the eddy-current heating cooker of the 7th mode of the present invention formed like this can proceed to after immersion process and boiling maintenance process, the temperature of switch element is suppressed to the ceiling temperature etc. of its storage temperature and all size below the high limit of tolerance temperature, can improves the security of eddy-current heating cooker.
In above-mentioned eddy-current heating cooker of the present invention like this, be configured to: do not have for the element of cooling the inverter for example cooling unit of switch element (cooling fan) and thermal storage unit, in process before the process of boiling and boiling maintenance process, setting, for the cooling period of this switch element, is cooled to the temperature of expectation.
Therefore, in eddy-current heating cooker of the present invention, be configured to the pressure of not carrying out based on cooling unit cooling, thereby can make the Air Flow in the eddy-current heating cooker few, improve the heat insulating ability of pot.In addition, in immersion process, even stop the heating of pot temporarily, because the temperature of pot descends lentamente, therefore so long as stop in short time heating, bring large impact can not to the performance of cooking.Like this, in eddy-current heating cooker of the present invention, because the element that can make to use in inverter is naturally cooling, therefore, can be in the situation that do not increase size, weight and the manufacturing cost of eddy-current heating cooker, make element naturally cooling reliably, can, when maintaining the performance of cooking of eddy-current heating cooker, improve quietness, handlability and taking in property.
Below, with reference to accompanying drawing, the eddy-current heating cooker as embodiments of the present invention is described.In addition, eddy-current heating cooker of the present invention is not limited to the structure of the eddy-current heating cooker that following embodiment puts down in writing, and also comprises the illustrated identical technological thought of technological thought of embodiment based on following and the induction heating apparatus that forms.
(embodiment 1)
Below, with reference to accompanying drawing, the eddy-current heating cooker of embodiments of the present invention 1 is described.Fig. 1 is the longitudinal section of structure that the eddy-current heating cooker of embodiments of the present invention 1 is shown, and wherein, a part of circuit structure modularization is illustrated.
As shown in Figure 1, the eddy-current heating cooker of embodiment 1 is configured to have: cooker main body 1, and it takes in pot 2 in mode removably; And covering 3, its upper opening to cooker main body 1 is opened and closed.Cooker main body 1 forms the roughly cylindric of upper opening and bottom lock, has the bearer bar 10 as the pot incorporating section in the inside of cooker main body 1.The inside of this bearer bar 10 is configured in mode removably and takes in pot 2, at the inner peripheral surface of pot 2, is painted with waterline.There is the heater coil 5 that pot 2 is heated in the outside of bearer bar 10.
Be arranged on control part 8 control inverters 7 of cooker main body 1 inside, by control inverter 7, apply the high frequency electric of expectation to heater coil 5, make heater coil 5 produce induced field and pot 2 is heated.In addition, in the eddy-current heating cooker of embodiment 1, the power of heater coil 5 is set to 700W.
One end (right side in Fig. 1) of lid 3 is supported on the rear of bearer bar 10 in mode free to rotate by hinge 3a, and be rotated spring (the omitting diagram) application of force, and wherein, but described lid 3 is arranged on the top of cooker main body 1 in the mode of freely openable.Be equipped with at lid 3 the other end (left side in Fig. 1) the hook-type button 1a that is supported on the place ahead (left in Fig. 1 to) of bearer bar 10 with mode axle free to rotate, this hook-type button 1a engages with the part of covering 3 the other end, prevents from covering 3 open.That is, when hook-type button 1a engage with a lid part of 3, utilize hook-type button 1a to keep covering 3 and make to cover 3 and can not open, make to be accommodated in cooker main body 1 pots 2 in blocked state.
As shown in Figure 1, in the bottom of lid 3, be equipped with the inner cap 4 with steam port 4b, this steam port 4b is for discharging the steam produced in the inside of pot 2 when cooking and be incubated.The top of this inner cap 4 is equipped with the steam drum 11 of tubular, and this steam drum 11 makes the inside of pot 2 be communicated with the outside of cooker main body 1 via steam port 4b and steam nozzle 11a.
Be equipped with steam port sealing ring 6 between steam drum 11 and inner cap 4, prevent that the steam of the inside of pot 2 from flowing into the inside of covering 3.In addition, the peripheral part at inner cap 4 is equipped with inner cap sealing ring 4a, the upper surface butt of the flange part of the upper opening edge of this inner cap sealing ring 4a and conduct pot 2.By this inner cap sealing ring 4a is set, the steam that prevent in the neutralization insulation of cooking, produces in the inside of pot 2 flows out to the outside of cooker main body 1 in addition from steam port 4b.
Pot temperature test section 9 is set to the approximate centre section butt with the outside bottom surface of pot 2, conducts to detect the temperature of pot 2 by the heat from pot 2.Lid temperature detecting part 12 is set to and inner cap 4 butts, is used to conduct to detect from the heat of inner cap 4 temperature of inner cap 4.
In addition; in the eddy-current heating cooker of embodiment 1; can use resin-case to form cooker main body 1, cover 3, bearer bar 10 and steam drum 11; use the metal-made pots such as iron or SUS stainless steel to form pot 2; use the metal-made lid to form inner cap 4; and, can form inner cap sealing ring 4a and steam port sealing ring 6 with rubber sealing ring processed.In addition, can use copper coil to form heater coil 5, use high-frequency inverter to form inverter 7, use microcomputer to form control part 8, use thermistor to form pot temperature test section 9 and lid temperature detecting part 12, and, use touch-screen to form operation display part 13.By as above forming like this, can easily form the eddy-current heating cooker of embodiment 1.In addition, the said structure of the eddy-current heating cooker of embodiment 1 is only example, also can form by the parts with identical function.
Fig. 2 is the circuit diagram of schematic configuration that the eddy-current heating cooker of embodiments of the present invention 1 is shown.
In embodiment 1, be configured to: be accommodated in pot 2 in the eddy-current heating cooker be configured in heater coil 5 near, make heater coil 5 and pot 2 carry out magnetic coupling, thus pot 2 is carried out to eddy-current heating.
In inverter 7, utilize diode bridge 202, choking-winding 203 and 204 pairs of alternating currents from AC power 201 of smoothing capacitor carry out rectification, level and smooth after, utilize switch element 205 and resonant capacitor 206 to be converted to high frequency electric, and provide high frequency electric to heater coil 5.
The input current provided from AC power 201 is provided current detecting part 207, such as consisting of current transformer and/or shunt resistance etc.
As shown in Figure 2, in the eddy-current heating cooker of embodiment 1, be provided with the component temperature test section 208 detected for the temperature to switch element 205.This component temperature test section 208 is such as consisting of thermistor etc.
As mentioned above, in the eddy-current heating cooker of embodiment 1, be configured to and do not have for switch element 205 being forced to cooling cooling unit and for the thermal storage unit of the heat radiation of accumulating switch element 205.
Next, action and effect in the eddy-current heating cooker of embodiments of the present invention 1 are described.
Fig. 3 is the procedure chart of cooking of the eddy-current heating cooker of embodiment 1.In Fig. 3, the curve of upside illustrates an example of the variation of pot 2 the detected temperatures detected by pot temperature test section 9, and the curve of downside illustrates the example of variation of the detected temperatures of the switch element 205 detected by component temperature test section 208.The longitudinal axis of Fig. 3 illustrates the detected temperatures of pot 2, and transverse axis illustrates the elapsed time.
As shown in Figure 3, the process of cooking of the eddy-current heating cooker of embodiment 1 be take the immersion process with the 1st immersion process and the 2nd immersion process, the process that boils, boiling maintenance process and (the む ら) process of cooking rice over a slow fire and is formed as main procedure.In addition, as other process, the reservation standby process of preengaging while cooking, the insulating process after cooked etc. are arranged, these processes are suitably carried out according to the condition of cooking be set by the user.
Immersion process is the temperature that makes the water maintenance constant in pot 2, makes the process of rice water suction.The process of boiling is to make the temperature in pot continue to rise, and makes the process of water boiling.The boiling maintenance process is the fluidized state that maintains water, makes the starch gelatinization of rice, the process of making rice.The process of cooking rice over a slow fire is that the rice after boiling is boiled in a covered pot over a slow fire to steaming, makes pot interior rice complete equably the process of culinary art.Control method in above-mentioned each process is stored in control part 8.
The action in the situation that cooked in the eddy-current heating cooker of embodiment 1, at first, the user drops into the meter He Shui of scheduled volume to the inside of pot 2, pot 2 is arranged in cooker main body 1.After being arranged in cooker main body 1 by pot 2, utilize operation display part 13 to set the condition of cooking, the operation that is started to cook.After by the operation that starts to cook, to control part 8 inputs, cooking commencing signal, control part 8 starts immersion process.
Immersion process is following process: rice is immersed in than in the water of rice gelatinization point low (temperature of 60 ℃ of left and right), makes in advance the rice water suction, thus, in process afterwards, fully gelatinization is until the central part of rice.In addition, immersion process is to utilize the amylase contained in rice that starch is decomposed, and generates glucose, produces the process of rice sweet taste.
In embodiment 1, immersion process forms by the 1st immersion process as first half term with as the 2nd immersion process of the second half.In addition, in the present invention, with first half term and the second half of immersion process, be illustrated, but first half term and the second half are not illustrated in temporal immersion process half, only mean temporal priority.
Therefore, in immersion process, controlled, make for example, during predetermined soak time (, 20 minutes) in, temperature is lower than the rice gelatinization point, and the detected temperatures of pot temperature test section 9 is 60 ℃ of left and right.
At first, in the 1st immersion process of the first half term as immersion process, control part 8 is controlled, and makes pot 2 in as for example, than 60 ℃ of slightly high temperature, predetermined soaking temperatures (, 65 ℃).This predetermined soaking temperature is the highest temperature in the temperature lower than rice gelatinization point.Control part 8 makes the temperature detection of carrying out based on pot temperature test section 9, if 65 ℃ of its detected temperatures less thaies apply high frequency electric to heater coil 5 are heated pot 2.On the contrary, if detected temperatures, more than 65 ℃ stop applying high frequency electric to heater coil 5, stops the heating of pot 2.
Since the 1st immersion process through the 1st soak time A(for example, 15 minutes) time, proceed to the 2nd immersion process as the second half of immersion process.
In the 2nd immersion process, the detected temperatures of the switch element 205 of control part 8 based on being detected by component temperature test section 208, stop applying high frequency electric to heater coil 5, until the detected temperatures of component temperature test section 208 becomes below the cooling maximum temperature of predetermined element.
The temperature of switch element 205, in the longer process of time that applies high frequency electric to heater coil 5, reaches maximum temperature in the process of boiling or boiling maintenance process.
In the 2nd immersion process, when the detected temperatures of switch element 205 reaches the cooling maximum temperature of predetermined element, the 2nd immersion process finishes, and proceeds to the ensuing process that boils.The cooling maximum temperature of this predetermined element refers to, switch element 205 is in the situation that be no more than as the maximum temperature produced in the process that boils of the process after immersion process and boiling maintenance process that the storage temperature of switch element 205 and/or the ceiling temperature of all size (maximum rated temperature, temperature ceiling) etc. are the high limit of tolerance temperature, the temperature of switch element 205 when the process of boiling starts when immersion process finishes.The cooling maximum temperature of predetermined element is to utilize experiment or emulation etc. and the data that are pre-calculated out, and these data are stored in advance in control part 8.Therefore, the 2nd soak time B(in the 2nd immersion process for example, 5 minutes) be the time that the detected temperatures of switch element 205 reaches the cooling maximum temperature of predetermined element.
In the 2nd immersion process, apply high frequency electric if stop to heater coil 5, the thermal capacitance due to pot 2 makes pot temperature descend lentamente, if stop in short time, apply, can make pot 2 maintain the temperature province of the 60 ℃ left and right lower than rice gelatinization point, bring impact can to the performance of cooking.Therefore, in the 2nd immersion process, can, when making switch element 205 naturally cooling, make the rice water suction.
Become the cooling maximum temperature of predetermined element when following in the detected temperatures of component temperature test section 208, proceed to the process of boiling.
In the process of boiling, pot 2 is heated, for example, until the detected temperatures of pot temperature test section 9 reaches near the predetermined cooking temperature of the boiling point (, 100 ℃) of water.In addition, now, can be according to the difference of the thermograde of detected temperatures, judge by the amount of culinary art thing, the i.e. amount of cooking.
In the process of boiling, heater coil 5 is continued to carry out applying of high frequency electric, until for example reach, as near the predetermined cooking temperature boiling point of water (, 100 ℃).Therefore, in the process of boiling, switch element 205 reaches the situation of maximum temperature, is that switch element 205 reaches maximum temperature when the end of the process of boiling.
In the process of boiling, for example, when the detected temperatures of pot temperature test section 9 reaches predetermined cooking temperature (, 100 ℃), proceed to the boiling maintenance process.
The boiling maintenance process is the starch gelatinization that makes rice, the process of gelatinization degree being brought up to 50%～60% left and right.In the boiling maintenance process, control part 8 is moved inverter 7, to heater coil 5, applies high frequency electric, and pot 2 is added to thermal control so that pot 2 have water during, the meter He Shuis of pot in 2 maintain fluidized state.Now, control part 8 utilizes PWM to control in inverter 7, heater coil 5 is added to thermally operated ON/OFF and control.
In the boiling maintenance process, owing to making the water constantly boiling, therefore a large amount of steam that produces 100 ℃, unnecessary steam is discharged by steam drum 11, outside from from steam nozzle 11a to cooker main body 1 from steam port 4b.Utilize the heating action in this boiling maintenance process, make the water in pot 2 be absorbed, evaporate by rice, thus, the moisture in pot 2 becomes while almost not having, more than the temperature of pot 2 rises to the boiling point of water.For example, when the detected temperatures of pot temperature test section 9 reaches predetermined boiling and maintains end temp (, 130 ℃), finish the boiling maintenance process, proceed to the ensuing process of cooking rice over a slow fire.
In the process of boiling, before reaching near the boiling point of water, control part 8 is controlled and is made inverter 7 carry out discontinuously applying the high frequency electric of heater coil 5 by PWM, in ensuing boiling maintenance process, switch element 205 reaches the situation of maximum temperature, is that switch element 205 reaches maximum temperature when the end of boiling maintenance process.
In the eddy-current heating cooker of embodiment 1, in the boiling maintenance process, apply high frequency electric according to the detected temperatures of pot temperature test section 9 to heater coil 5, make the water in pot 2 can maintain boiling, therefore, when the amount of cooking is few, the application time of high frequency electric is short, long at the application time of the amount of cooking high frequency electric of many times.Therefore, if the amount of cooking is few, switch element 205 reaches maximum temperature when the process that boils finishes, if the amount of cooking is many, switch element 205 reaches maximum temperature when the boiling maintenance process finishes.
The process of cooking rice over a slow fire is the starch gelatinization that makes rice, gelatinization degree is brought up to near the process 100%.In the process of cooking rice over a slow fire, be charred, prevent that the temperature of rice from descending for fear of the bottom of a pan, promote gelatinization and make the rice homogenising in pot 2, thereby in the process of cooking rice over a slow fire, repeatedly append the heating of boiling (for example, 2 times) according to the elapsed time.In the process of cooking rice over a slow fire, control part 8 is controlled inverter 7 is carried out heater coil 5 is added to thermally operated ON/OFF control by PWM, for example, so that the temperature of pot temperature test section 9 keeps the predetermined temperature of cooking rice over a slow fire (, 80 ℃).And, in the process of cooking rice over a slow fire, after the scheduled time is carried out in the action of cooking rice over a slow fire, finish the process of cooking rice over a slow fire, complete whole processes of cooking.
In addition, in the eddy-current heating cooker of embodiment 1, with in the 2nd immersion process, when the detected temperatures of component temperature test section 208 is that the cooling maximum temperature of predetermined element is when following, the structure that proceeds to the ensuing process that boils is illustrated, but, also can not use component temperature test section 208 and utilize the predefined scheduled time to decide the finish time of the 2nd immersion process.For example, also can be configured to: in the 2nd immersion process, do not carry out the temperature detection of the switch element 205 based on component temperature test section 208, but, in during the cooling minimum time of predefined predetermined element, stop applying high frequency electric to heater coil 5.
After stopping applying high frequency electric to heater coil 5, by the naturally cooling temperature of switch element 205 that makes, descend.The cool time when maximum temperature that the cooling minimum time of predetermined element is switch element 205 in the process of boiling or boiling maintenance process is no more than the high limit of tolerance temperature such as ceiling temperature of the storage temperature of switch element 205 and/or all size, switch element 205.The cooling minimum time of this predetermined element is to utilize experiment or emulation etc. and the data that are pre-calculated out, and these data that calculate are as the cooling minimum time of predetermined element, pre-stored in control part 8.
In the eddy-current heating cooker as above formed like this, in the 2nd immersion process, in during the cooling minimum time of predetermined element, stop applying high frequency electric to heater coil 5, thus, switch element 205 can be suppressed to the storage temperature of this switch element 205 and/or the ceiling temperature of all size etc. below the high limit of tolerance temperature at the maximum temperature in the process of boiling and boiling maintenance process.Consequently, the eddy-current heating cooker of this embodiment becomes the cooker that safety and reliability is high.
In the embodiments of the present invention that as above form like this, for example, due to heater coil 5 and switch element 205 based on cooling unit (are not carried out, cooling fan) pressure is cooling, thereby be configured to and can make the Air Flow of eddy-current heating cooker inside few, further improve the heat insulating ability of pot 2.
As mentioned above, in the eddy-current heating cooker of embodiments of the present invention, the Air Flow of eddy-current heating cooker inside is few, improved the heat insulating ability of pot 2, therefore, even stop the heating to pot 2 in the 2nd immersion process temporarily, the temperature of pot 2 also just descends lentamente.Consequently, in the structure of embodiments of the present invention, as long as to stop be the short time to the heating in the 2nd immersion process, bring large impact can not to the performance of cooking, can make reliably switch element 205 cooling.
In addition, structure according to the embodiment of the present invention, in the 2nd immersion process, stop the high frequency electric applying to heater coil 5, thus, not only can carry out switch element 205 coolingly, and can carry out cooling to the rectifier cell of diode bridge 202.
As mentioned above, in eddy-current heating cooker of the present invention, can be in the situation that do not increase size, weight and the manufacturing cost of cooker, make reliably the element that uses in inverter naturally cooling, can, when maintaining the performance of cooking of eddy-current heating cooker, improve quietness, handlability and taking in property.
Utilizability on industry
Eddy-current heating cooker of the present invention can improve quietness, handlability and taking in property when maintaining the performance of cooking, and as the cooker in uses such as average family, restaurants, is therefore useful.
Claims (7)
1. an eddy-current heating cooker, is characterized in that, this eddy-current heating cooker has:
The cooker main body;
Pot, it is accommodated in described cooker main body in the mode that can freely load and unload;
Heater coil, it produces the induced field that described pot is heated;
Inverter, its action by element applies high frequency electric to described heater coil;
Control part, the described heater coil of its subtend applies the described inverter of high frequency electric and is controlled; And
The pot temperature test section, it detects the temperature of described pot;
Described control part is configured to:
In the first half term of the immersion process in rice is immersed in to the water lower than rice gelatinization point, according to the detected temperatures of described pot temperature test section, by described inverter, to described heater coil, apply high frequency electric, so that described pot becomes predetermined soaking temperature,
In the second half of described immersion process, stop the high frequency electric applying to described heater coil by described inverter, make the described element in described inverter cooling, so that the maximum temperature produced in the process of described element after this immersion process in described inverter is the temperature that is no more than the high limit of tolerance temperature of this element.
2. eddy-current heating cooker according to claim 1, is characterized in that,
This eddy-current heating cooker also has the component temperature test section that the temperature to the described element in described inverter is detected,
Described control part is configured to: in the second half of described immersion process, stop the high frequency electric applying to described heater coil by described inverter, until the detected temperatures of described component temperature test section becomes below the cooling maximum temperature of predetermined element, when the detected temperatures of described component temperature test section reaches the cooling maximum temperature of predetermined element, proceed to ensuing process.
3. eddy-current heating cooker according to claim 2, is characterized in that,
The cooling maximum temperature of described predetermined element is described element in described inverter in the situation that the maximum temperature produced in the process after described immersion process is temperature, the temperature described element of described immersion process while finishing that is no more than the high limit of tolerance temperature of this element.
4. eddy-current heating cooker according to claim 3, is characterized in that,
Described element in described inverter is switch element, process after described immersion process is to apply the process that boils and the boiling maintenance process of high frequency electric to described heater coil by described inverter, the cooling maximum temperature of the described predetermined element for described switch element when described immersion process finishes is set to, and makes the maximum temperature of described switch element in described boil process or described boiling maintenance process be no more than the high limit of tolerance temperature of this switch element.
5. eddy-current heating cooker according to claim 1, is characterized in that,
Described control part is configured to: until, in the cooling minimum time of predetermined element during the end of the second half of described immersion process, stop the high frequency electric applying to described heater coil by described inverter, make described element cooling.
6. eddy-current heating cooker according to claim 5, is characterized in that,
The cooling minimum time of described predetermined element is until be set so that the maximum temperature produced in the process of described element after described immersion process in described inverter becomes the temperature of the high limit of tolerance temperature that is no more than this element the cool time of the described element of described immersion process while finishing.
7. eddy-current heating cooker according to claim 6, is characterized in that,
Described element in described inverter is switch element, process after described immersion process is to apply the process that boils and the boiling maintenance process of high frequency electric to described heater coil by described inverter, until the described predetermined element cooling minimum time of described immersion process while finishing is set so that the maximum temperature of described switch element in described boil process and described boiling maintenance process is no more than the high limit of tolerance temperature of this switch element.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012127759A JP2013252167A (en) | 2012-06-05 | 2012-06-05 | Induction heating rice cooker |
| JP2012-127759 | 2012-06-05 |
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| CN103462482A true CN103462482A (en) | 2013-12-25 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106166023A (en) * | 2015-05-19 | 2016-11-30 | 松下知识产权经营株式会社 | Cooker |
| CN106264072A (en) * | 2015-06-08 | 2017-01-04 | 佛山市顺德区美的电热电器制造有限公司 | Control the method and apparatus of cooking apparatus, cooking apparatus and terminal |
| CN106308457A (en) * | 2015-06-29 | 2017-01-11 | 飞利浦（嘉兴）健康科技有限公司 | Rice cooking method and electric rice cooker used for rice cooking |
| CN109691867A (en) * | 2017-10-24 | 2019-04-30 | 佛山市顺德区美的电热电器制造有限公司 | Split cooking apparatus and its method for heating and controlling and device |
| CN110461193A (en) * | 2017-04-06 | 2019-11-15 | 三菱电机株式会社 | Electromagnetic induction heating cooker |
| CN113647791A (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 | Cooking method and device, pot and storage medium |
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| CN103792860B (en) * | 2013-07-31 | 2016-05-11 | 珠海优特电力科技股份有限公司 | A kind of monitoring method and Intelligent cooker lid of carrying button based on Intelligent cooker lid carried button, pot cover |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2790081B2 (en) * | 1995-06-28 | 1998-08-27 | タイガー魔法瓶株式会社 | Electromagnetic rice cooker |
| JPH09140562A (en) * | 1995-11-22 | 1997-06-03 | Toshiba Home Technol Corp | Ih jar rice cooker |
| JP2003259973A (en) * | 2002-03-08 | 2003-09-16 | Hitachi Hometec Ltd | Rice cooker |
-
2012
- 2012-06-05 JP JP2012127759A patent/JP2013252167A/en active Pending
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2013
- 2013-06-04 CN CN 201310218416 patent/CN103462482A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106166023A (en) * | 2015-05-19 | 2016-11-30 | 松下知识产权经营株式会社 | Cooker |
| CN106264072A (en) * | 2015-06-08 | 2017-01-04 | 佛山市顺德区美的电热电器制造有限公司 | Control the method and apparatus of cooking apparatus, cooking apparatus and terminal |
| CN106264072B (en) * | 2015-06-08 | 2018-07-27 | 佛山市顺德区美的电热电器制造有限公司 | Control method and apparatus, cooking apparatus and the terminal of cooking apparatus |
| CN106308457A (en) * | 2015-06-29 | 2017-01-11 | 飞利浦（嘉兴）健康科技有限公司 | Rice cooking method and electric rice cooker used for rice cooking |
| CN110461193A (en) * | 2017-04-06 | 2019-11-15 | 三菱电机株式会社 | Electromagnetic induction heating cooker |
| CN109691867A (en) * | 2017-10-24 | 2019-04-30 | 佛山市顺德区美的电热电器制造有限公司 | Split cooking apparatus and its method for heating and controlling and device |
| CN113647791A (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 | Cooking method and device, pot and storage medium |
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| Publication number | Publication date |
|---|---|
| JP2013252167A (en) | 2013-12-19 |
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Application publication date: 20131225 |