CN103519674A - An induction heating cooking device - Google Patents
An induction heating cooking device Download PDFInfo
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- CN103519674A CN103519674A CN201310273414.7A CN201310273414A CN103519674A CN 103519674 A CN103519674 A CN 103519674A CN 201310273414 A CN201310273414 A CN 201310273414A CN 103519674 A CN103519674 A CN 103519674A
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Abstract
The invention provides an induction heating cooking device. The induction heating cooking device is configured in a manner that in the first half of an immersing process, according to the detected temperature of a pan temperature detecting portion (9), an inverter (7) applies high-frequency current to a heating coil (5) such that a pan (2) reaches a predetermined immersing temperature; in the second half of the immersing process, current is stopped from being applied to the heating coil so as to cool the heating coil such that the highest temperature of the heating cool in a process after the immersing process is not over the upper allowable temperature of the heating coil.
Description
Technical field
The present invention relates to the eddy-current heating cooker using in average family, restaurant etc.
Background technology
In the past, be known to pot to carry out the eddy-current heating cooker of eddy-current heating, this eddy-current heating cooker has: heater coil, and it produces the induced field that pot is heated; And inverter, it applies high frequency electric to heater coil.
In addition, for the heater coil of generation induced field, when current flowing, can generate heat due to the resistance of heater coil self, produce thermal losses.
In order to reduce such thermal losses, be known to possess cooling fan and heater coil is forced to cooling eddy-current heating cooker.As such structure, for example, there is disclosed eddy-current heating cooker in Japanese kokai publication hei 5-309037 communique (patent documentation 1).
Patent documentation 1: Japanese kokai publication hei 5-309037 communique
But in above-mentioned eddy-current heating cooker in the past, the motion and sound of cooling fan is large, such as in the morning or late into the night etc. around quietly under situation, may hear cooling fan wind noise and hinder sleep.
In addition, due to the existence of cooling fan, the size of eddy-current heating cooker and weight increase, and have the handlability of infringement eddy-current heating cooker and the problem of taking in property, or the problem that exists manufacturing cost to rise.
Summary of the invention
The object of the invention is to solve the problem in above-mentioned eddy-current heating cooker in the past, a kind of eddy-current heating cooker is provided, this eddy-current heating cooker does not need the miniaturization of cooling fan or does not need to possess cooling fan, can not increase size, weight and the cost of manufacture of eddy-current heating cooker, improve handlability and taking in property.
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:
Cooker main body;
Pot, its handling are accommodated in described cooker main body freely;
Heater coil, it produces the induced field that described pot is heated;
Inverter, it applies high frequency electric to described heater coil;
Control part, it controls the described inverter that described heater coil is applied to high frequency electric; And
Pot temperature test section, it detects the temperature of described pot,
Described control part is configured to:
In rice being immersed in than the first half term of the immersion process in the low water of the temperature of rice gelatinization, according to the detected temperatures of described pot temperature test section, by described inverter, described heater coil is applied to high frequency electric, make described pot reach predetermined soaking temperature,
In the second half of described immersion process, stop the high frequency electric that described inverter applies described heater coil and make this heater coil cooling, so that the maximum temperature of the described heater coil in the process after this immersion process becomes the temperature of the upper limit allowable temperature that is no more than described heater coil.
Eddy-current heating cooker of the present invention can in the situation that do not increase size, weight and the manufacturing cost of eddy-current heating cooker and the element using in inverter is carried out cooling, can improve handlability and taking in property when maintaining the performance of cooking of eddy-current heating cooker.
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 the eddy-current heating cooker of embodiments of the present invention 1 is roughly shown.
Fig. 3 is the procedure chart of cooking in the eddy-current heating cooker of embodiments of the present invention 1.
Fig. 4 is the longitudinal section of structure that the eddy-current heating cooker of embodiments of the present invention 2 is shown.
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, 14 heater coil temperature detecting parts, 15 timers.
The specific embodiment
The eddy-current heating cooker of the 1st mode of the present invention has:
Cooker main body;
Pot, its handling are accommodated in described cooker main body freely;
Heater coil, it produces the induced field that described pot is heated;
Inverter, it applies high frequency electric to described heater coil;
Control part, it controls the described inverter that described heater coil is applied to high frequency electric; And
Pot temperature test section, it detects the temperature of described pot,
Described control part is configured to:
In rice being immersed in than the first half term of the immersion process in the low water of the temperature of rice gelatinization, according to the detected temperatures of described pot temperature test section, by described inverter, described heater coil is applied to high frequency electric, make described pot become predetermined soaking temperature,
In the second half of described immersion process, stop the high frequency electric that described inverter applies described heater coil and make this heater coil cooling, so that the maximum temperature of the described heater coil in the process after this immersion process becomes the temperature of the upper limit allowable temperature that is no more than described heater coil.
In the eddy-current heating cooker of the 1st mode of the present invention as above forming like this, in immersion process, rice is immersed in than in the low water of the temperature of rice gelatinization, make rice water suction, in the process after immersion process, until the fully gelatinization of central part of rice, and the temperature of pot is adjusted to during predetermined soak time lower than the temperature of rice gelatinization.
In the 1st immersion process of the first half term as immersion process, predetermined soaking temperature is made as to the temperature lower than the temperature of meter Fa Sheng gelatinization, make the rice water suction in pot.In addition, in the 2nd immersion process of the second half as immersion process, the high frequency electric that stops applying to heater coil, thus, temperature declines lentamente due to the thermal capacitance of pot, but, if stop in short time applying, can maintain lower than the temperature of rice gelatinization and can not bring in the temperature range of impact the performance of cooking.Therefore,, in the second half of immersion process, can when making heater coil cooling, make rice water suction.
For example, cooking in process of the long process that boils of the time that applies high frequency electric to heater coil or boiling maintenance process, the temperature of heater coil reaches maximum temperature.But in eddy-current heating cooker of the present invention, the temperature of the heater coil when process of boiling starts in the time of can reducing immersion process and finish, can be reduced to the maximum temperature of the heater coil in the process of boiling or boiling maintenance process below heat resisting temperature.
Therefore, can make heater coil 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.
In the eddy-current heating cooker of the 2nd mode of the present invention, especially in described the 1st mode, this eddy-current heating cooker also has the heater coil temperature detecting part that the temperature of described heater coil is detected, described control part is configured to: in the second half of described immersion process, stop the high frequency electric that described inverter applies described heater coil, until the detected temperatures of described heater coil temperature detecting part becomes below the cooling maximum temperature of predetermined heater coil, when the detected temperatures of described heater coil temperature detecting part reaches the described predetermined cooling maximum temperature of heater coil, transfer to next process.
In the eddy-current heating cooker of the 2nd mode of the present invention as above forming like this, in immersion process, be provided with make this heater coil 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 heater coil temperature detecting part becomes below the cooling maximum temperature of predetermined heater coil.Therefore, the eddy-current heating cooker of the 2nd mode of the present invention can be suppressed at the storage temperature of this heater coil and the ceiling temperature of all size etc. below upper limit allowable temperature (heat resisting temperature) by the maximum temperature of the heater coil in the process that boils after immersion process or boiling maintenance process, can improve the security of eddy-current heating cooker.
In the eddy-current heating cooker of the 3rd mode of the present invention, especially in the 2nd described mode, the cooling maximum temperature of described predetermined heater coil is that the maximum temperature of the described heater coil in the process after described immersion process is to be no more than temperature in the situation of temperature of upper limit allowable temperature (heat resisting temperature) of this heater coil, the described heater coil of described immersion process while finishing.
In the eddy-current heating cooker of the 3rd mode of the present invention as above forming like this, when calculating immersion process and finish according to experiment, emulation etc., the temperature of this heater coil of the process of boiling while starting, make can not surpass the storage temperature of this heater coil and the upper limit allowable temperatures (heat resisting temperature) such as ceiling temperature of all size in the process that boils of the process as after immersion process or the maximum temperature of the heater coil in boiling maintenance process.The data that calculate are like this as the cooling maximum temperature of predetermined heater coil, pre-stored in control part.
As mentioned above, the eddy-current heating cooker of the 3rd mode of the present invention 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 heater coil temperature detecting part becomes below the cooling maximum temperature of heater coil.In the process that boils that the eddy-current heating cooker of the 3rd mode of the present invention forming like this can proceed to after immersion process or boiling maintenance process, heater coil is suppressed to the ceiling temperature etc. of this storage temperature and all size below upper limit allowable temperature (heat resisting temperature), can improves the security of eddy-current heating cooker.
In the eddy-current heating cooker of the 4th mode of the present invention, especially in the 1st described mode, this eddy-current heating cooker also has the timer that the driving dwell time of described heater coil is carried out to timing, described control part is configured to: in the second half of described immersion process, stop the high frequency electric that described inverter applies described heater coil, until the instrumentation time of described timer reaches the predetermined cooling minimum time of heater coil, when reaching the described predetermined cooling minimum time of heater coil, transfer to next process.
The eddy-current heating cooker of the 4th mode of the present invention as above forming is like this in the 2nd immersion process of the second half as immersion process, and the high frequency electric that stops applying to heater coil, thus by the naturally cooling temperature that reduces heater coil.The natural cool time of switch element while precomputing when ending in immersion process and finishing according to experiment, emulation etc. that the process of boiling starts, make the process that boils after immersion process or the maximum temperature of the heater coil in boiling maintenance process can not surpass the storage temperature of this heater coil and the upper limit allowable temperatures such as ceiling temperature of all size.The data that calculate are like this as the cooling minimum time of predetermined heater coil, pre-stored in control part.
In the eddy-current heating cooker of the 5th mode of the present invention, especially in the 1st described mode, the cooling minimum time of described predetermined heater coil be the maximum temperature of the described heater coil in the process after described immersion process be no more than the driving that stops described heater coil in the situation of temperature of upper limit allowable temperature of this heater coil, in described immersion process the second half during.
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 predetermined cooling minimum time of heater coil, the high frequency electric that stops applying to heater coil, thus, in the process that boils that can proceed to and boiling maintenance process, be suppressed at the storage temperature of heater coil and the ceiling temperature of all size etc. below upper limit allowable temperature after immersion process.Consequently, the eddy-current heating cooker of the 5th mode of the present invention can improve reliability and security.
In the eddy-current heating cooker of the 6th mode of the present invention, especially, in any one mode in described 1st～5, described eddy-current heating cooker is configured to not to be had for described heater coil is carried out to cooling driving mechanism.
In the eddy-current heating cooker of the 6th mode of the present invention as above forming like this, be configured to do not use for heater coil is carried out cooling driving mechanism for example cooling fan implement to force cooling, thereby the Air Flow in eddy-current heating cooker is few, can improve the heat insulating ability of pot.In addition, even if stop for the moment the heating of pot in immersion process, the temperature of pot also just declines lentamente, therefore so long as stop in short time heating, bring serious impact just can not to the performance of cooking.Like this, in eddy-current heating cooker of the present invention, can make heater coil naturally cooling, therefore, can be in the situation that do not increase size, weight and the manufacturing cost of eddy-current heating cooker, make heater coil be cooled to reliably the temperature of expectation, 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.It should be noted that, eddy-current heating cooker of the present invention is not limited to the structure of the eddy-current heating cooker that following embodiment records, and also comprises the identical technological thought of technological thought based on illustrating in following embodiment 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 be had: cooker main body 1, and it takes in pot 2 in the mode that can load and unload; And covering 3, its upper opening to cooker main body 1 opens and closes.Cooker main body 1 forms the roughly cylindric of upper opening and bottom lock, has the bearer bar 10 as pot incorporating section in the inside of cooker main body 1.Be configured to, in the handling of the inside of this bearer bar 10, take in freely pot 2, on the inner peripheral surface of pot 2, be painted with waterline.In the outside of bearer bar 10, there is the heater coil 5 that pot 2 is heated.
The 8 pairs of inverters 7 of control part that are arranged in cooker main body 1 are controlled, and 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.
As shown in Figure 1, in the bottom of lid 3, be equipped with the inner cap 4 that possesses steam port 4b, the steam that this steam port 4b produces for discharge the inside of pot 2 in the neutralization insulation of cooking.Above this inner cap 4, be equipped with the steam drum 11 of tubular, this steam drum 11 is communicated with the inside of pot 2 via steam port 4b and steam nozzle 11a with the outside of cooker main body 1.
Between steam drum 11 and inner cap 4, be equipped with steam port seal 6, prevent that the steam of pot 2 inside from flowing into the inside of covering 3.In addition, the peripheral part at inner cap 4 is equipped with inner cap seal 4a, the upper surface butt of the flange part of the upper opening edge of this inner cap seal 4a and conduct pot 2.By this inner cap seal 4a is set, prevented that in the neutralization insulation of cooking inner steam that produce of pot 2 are from flowing out to the outside of cooker main body 1 beyond steam port 4b.
Pot temperature test section 9 is set to the approximate centre portion butt with the outside bottom surface of pot 2, by conduct to detect the temperature of pot 2 from the heat of pot 2.Lid temperature detecting part 12 is set to and inner cap 4 butts, by conduct to detect the temperature of inner cap 4 from the heat of inner cap 4.
In the eddy-current heating cooker of embodiment 1, be provided with the heater coil temperature detecting part 14 that the temperature of heater coil 5 is detected.
In addition; in the eddy-current heating cooker of embodiment 1; can form cooker main body 1 with resin-case, cover 3, bearer bar 10 and steam drum 11; with the metal pot such as iron or SUS, form pot 2; with metal lid, form inner cap 4, and form inner cap seal 4a and steam port seal 6 with rubber seal 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, lid temperature detecting part 12 and heater coil temperature detecting part 14, and use touch panel 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 having the parts of 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: by by be accommodated in pot 2 in eddy-current heating cooker be configured in heater coil 5 near, make heater coil 5 and pot 2 magnetic couplings, thus pot 2 is carried out to eddy-current heating.
In inverter 7, utilize diode bridge 202, choke coil 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, to heater coil 5, provide (applying) high frequency electric.
The input current providing from AC power 201 is provided current detecting part 207, such as consisting of current transformer, shunt resistance etc.
As shown in Figure 2, in the eddy-current heating cooker of embodiment 1, be provided with the heater coil temperature detecting part 14 for the temperature of heater coil 5 is detected, this heater coil temperature detecting part 14 is such as utilizing the formations such as thermistor.
As mentioned above, in the eddy-current heating cooker of embodiment 1, be configured to and do not have for heater coil 5 is forced to cooling cooling unit.
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, an example of the transformation of the detected temperatures of the pot 2 that the curve shown in solid line represents to be detected by pot temperature test section 9, the curve being shown in dotted line represents the example of transformation of the detected temperatures of the heater coil 5 that detected by heater coil temperature detecting part 14.The longitudinal axis of Fig. 3 represents detected temperatures, and transverse axis represents the elapsed time.
As shown in Figure 3, to be configured to have the immersion process of 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 be main procedure to the process of cooking of the eddy-current heating cooker of embodiment 1.In addition, as other process, have the reservation standby process of preengaging while cooking, the insulating process after cooked etc., these processes are suitably carried out according to the condition of cooking being set by the user.
Immersion process is to make the water in pot 2 keep the temperature of constant and make a meter process for water suction.The process of boiling is to make temperature in pot continue to rise and the process that makes water boiling.Boiling maintenance process is the fluidized state that maintains water, makes the starch gelatinization of rice and makes the process of 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 cook in the eddy-current heating cooker of embodiment 1, first, user drops into the meter He Shui of scheduled volume to the inside of pot 2, pot 2 is placed in cooker main body 1.After pot 2 is placed in cooker main body 1, utilize operation display part 13 to set the condition of cooking, the operation that starts to cook.By the operation that starts to cook, to control part 8, inputted and cook after commencing signal, control part 8 starts immersion process.
Immersion process is following process: rice is immersed in than in the water of the temperature of rice gelatinization low (temperature of 60 ℃ of left and right), makes in advance rice water suction before the process of boiling, thus in the process that boils afterwards etc., until the fully gelatinization of central part of rice.In addition, immersion process is also to utilize the amylase containing in rice that starch is decomposed, and generates glucose and produces the process of the sweet taste of rice.
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 do not represent it is half of immersion process in time, only represent temporal sequencing.
Therefore, in immersion process, control, make than the temperature of rice gelatinization detected temperatures low, pot temperature test section 9 for example, is 60 ℃ of left and right during predetermined soak time (, 20 minutes).
First, in the 1st immersion process of the first half term as immersion process, control part 8 is controlled, and makes the pot 2 predetermined soaking temperatures (for example, 65 ℃) that become than 60 ℃ slightly high.This predetermined soaking temperature is than the highest temperature in the low temperature of the temperature of meter Fa Sheng gelatinization.Control part 8 carries out the temperature detection of being carried out by pot temperature test section 9, if 65 ℃ of its detected temperatures less thaies apply high frequency electric to heater coil 5, pot 2 is heated.On the contrary, if detected temperatures 65 ℃ above; stop the high frequency electric applying to heater coil 5 and stop the heating of pot 2.
Since the 1st immersion process through the 1st soak time A(for example, 15 minutes) time, transfer to the 2nd immersion process as the second half of immersion process.
In the 2nd immersion process, control part 8 is according to the detected temperatures of the heater coil 5 being detected by heater coil temperature detecting part 14, stop applying high frequency electric to heater coil 5, until the detected temperatures of heater coil temperature detecting part 14 becomes below the cooling maximum temperature of predetermined heater coil.
The temperature of heater coil 5 in longer process of the time that applies high frequency electric to heater coil 5, i.e. boil process or boiling reach maximum temperature in maintenance process.
In the 2nd immersion process, when reaching the predetermined cooling maximum temperature of heater coil, the detected temperatures of heater coil 5 finishes the 2nd immersion process, transfer to the ensuing process that boils.The cooling maximum temperature of this predetermined heater coil refers in the situation that the maximum temperature of the heater coil 5 that the process that boils after immersion process or boiling produce in maintenance process can not surpass the temperature storage temperature of heater coil 5 and the upper limit allowable temperatures (heat resisting temperature) such as ceiling temperature of all size, immersion process while finishing, the process of the boiling heater coil 5 while starting.
In addition, the storage temperature of the heater coil 5 of the cooling maximum temperature of decision heater coil depends on the heat resisting temperature of the resin material that covers heater coil 5, for example, at storage temperature described in the H of JIS specification level, is 180 ℃, at storage temperature described in F level, is 155 ℃.
The cooling maximum temperature of predetermined heater coil be by experiment, the data that precompute such as emulation, 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 kinds) be the detected temperatures of heater coil 5 time while reaching the predetermined cooling maximum temperature of heater coil.
In addition, in the structure of the eddy-current heating cooker of embodiment 1, according to experiment, in the process that boils after immersion process and boiling maintenance process, heater coil 5 reaches ascending temperature till maximum temperature lower than about 130K(Kelvin), therefore, for example, in the situation that the storage temperature of heater coil 5 (heat resisting temperature) is 180 ℃, the cooling maximum temperature of heater coil can be made as to 50 ℃.But, this temperature is only example, can suitably set according to specification of eddy-current heating cooker etc.
Because the protected frame 10 of pot 2 covers, therefore have and be difficult to the cooling structure of nature, and heater coil 5 is because its lower surface is open, therefore becomes easy naturally cooling structure.
In addition,, because the thermal capacitance of pot 2 is greater than heater coil 5, therefore, even if stop the high frequency electric that applies to heater coil 5 in the 2nd immersion process, the pot temperature of pot 2 can be also decline lentamente because of its thermal capacitance.Therefore, if stop in short time applying high frequency electric, can make pot 2 maintain than in the temperature of rice gelatinization temperature province low, 60 ℃ of left and right, can when making heater coil 5 naturally cooling, make rice water suction, and can not bring impact to the performance of cooking.
In the detected temperatures of heater coil temperature detecting part 14, become the cooling maximum temperature of predetermined heater coil when following, transfer 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 becomes near the predetermined cooking temperature of the boiling point (, 100 ℃) of water.In addition, now, can judge the amount volume of thing of being cooked, the i.e. amount of cooking according to the difference of the thermograde of detected temperatures.
In the process of boiling, heater coil 5 is continuously applied to high frequency electric, for example, until reach near the predetermined cooking temperature (, 100 ℃) of boiling point of water.Therefore,, the in the situation that in the process of boiling, switch element 205 reaching maximum temperature, when the process of boiling finishes, switch element 205 becomes maximum temperature.In this case, in the boiling maintenance process after the process of boiling, to heater coil 5, apply high frequency electric and the situation that the amount of providing is few is provided discontinuously.
In the process of boiling, in the detected temperatures of pot temperature test section 9, reach predetermined cooking temperature (for example, 100 ℃) and through after the scheduled time, transfer to boiling maintenance process.
Boiling maintenance process is make the starch gelatinization of rice and make gelatinization degree rise to the process of 50%～60% left and right.In boiling maintenance process, control part 8 makes inverter 7 work, to heater coil 5, applies high frequency electric, and pot 2 is added to thermal control, make to have in pot 2 water during in, the meter He Shui in pot 2 maintains 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 boiling maintenance process, owing to making water constantly boiling, thereby produce the steam of a large amount of 100 ℃, unnecessary steam by steam drum 11, is discharged to the outside of cooker main body 1 from steam port 4b from steam nozzle 11a.By the heating in this boiling maintenance process, move, the water in pot 2 is absorbed, evaporates by rice, thus, and when the moisture in pot 2 almost disappears, 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 boiling maintenance process, enter 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 to heater coil 5, apply high frequency electric discontinuously by PWM, the in the situation that in ensuing boiling maintenance process, heater coil 5 reaching maximum temperature, when boiling maintenance process finishes, heater coil 5 becomes maximum temperature.
In the eddy-current heating cooker of embodiment 1, in boiling maintenance process, according to the detected temperatures of pot temperature test section 9, to heater coil 5, apply high frequency electric, make the water in pot 2 can maintain boiling, therefore, when the amount of cooking is less, the application time of high frequency electric is short, and when the amount of cooking is more, the application time of high frequency electric is long.Therefore, when the amount of cooking is less, heater coil 5 reaches maximum temperature when the process of boiling finishes, and when the amount of cooking is more, heater coil 5 reaches maximum temperature when boiling maintenance process finishes.
The process of cooking rice over a slow fire is the starch gelatinization that makes rice, and makes gelatinization degree rise near the process 100%.In the process of cooking rice over a slow fire, for fear of the bottom of a pan, be charred, prevent simultaneously that the temperature of rice from declining and promoting gelatinization and make the rice of pot in 2 even, in the process of cooking rice over a slow fire, carries out repeatedly (for example, 2 times) according to the elapsed time and append the heating of boiling.In the process of cooking rice over a slow fire, control part 8 utilizes PWM control to add thermally operated ON/OFF to heater coil 5 and controls in inverter 7, makes the temperature of pot temperature test section 9 keep the predetermined temperature of cooking rice over a slow fire (for example, 80 ℃).And, in the process of cooking rice over a slow fire, in the action of cooking rice over a slow fire, through after the scheduled time, 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, be configured to obstructed supercooling fan and heater coil 5 and switch element 205 forced cooling, therefore, the Air Flow in eddy-current heating cooker is few, can improve the heat insulating ability of pot 2.
Therefore, in the 2nd immersion process, when for the moment stop pot 2 heating time, the temperature of pot 2 declines lentamente.Therefore,, as long as the time that stops heating in the 2nd immersion process is short, bring serious impact just can to the performance of cooking, reliably cooling heater coil 5.
Therefore,, in the structure of the eddy-current heating cooker of embodiment 1, can in the situation that do not increase size, weight and the manufacturing cost of cooker, make heater coil 5 naturally cooling reliably.In addition, the eddy-current heating cooker of embodiment 1 is configured to and can, when maintaining the performance of cooking of eddy-current heating cooker, improves quietness, handlability and taking in property.
In addition, 1 structure according to the embodiment of the present invention, in the 2nd immersion process, stops the high frequency electric that applies to heater coil 5, thus, not only can make heater coil 5 cooling, and can make diode bridge 202 and switch element 205 cooling.
(embodiment 2)
Below, the eddy-current heating cooker of embodiments of the present invention 2 is described.
In the eddy-current heating cooker of above-mentioned embodiment 1, be configured in the 2nd immersion process of the second half as immersion process, when the detected temperatures of heater coil temperature detecting part 14 becomes the cooling maximum temperature of predetermined heater coil when following, transfer to the ensuing process that boils, but in the eddy-current heating cooker of embodiment 2, be configured to and do not use heater coil temperature detecting part 14, but utilize the predefined scheduled time to decide the finish time of the 2nd immersion process.In the eddy-current heating cooker of embodiment 2, in the 2nd immersion process, do not use heater coil temperature detecting part 14 to carry out the temperature detection of heater coil 5, but in during the predefined predetermined cooling minimum time of heater coil, stop applying high frequency electric and stopping the driving of heater coil 5 to heater coil 5.
Fig. 4 is the longitudinal section of structure that the eddy-current heating cooker of embodiments of the present invention 2 is shown.In embodiment 2, centered by the difference with embodiment 1, describe.In addition, in the explanation of embodiment 2, for the structure having with above-mentioned embodiment 1 identical function, mark identical reference marks, and description thereof is omitted.
As shown in Figure 4, the eddy-current heating cooker of embodiment 2 has timer 15, and this timer 15 is for to determining that the cooling minimum time of heater coil of the 2nd immersion process carries out timing.Timer 15 has the structure of the driving dwell time of heater coil 5 being carried out to timing, and is configured to when reaching this driving dwell time, conveys to control part 8.Other structure in the eddy-current heating cooker of embodiment 2 is identical with the eddy-current heating cooker of the embodiment 1 shown in Fig. 1.
In addition, can utilize microcomputer easily to form the timer 15 in embodiment 2.Owing to being also the structure with clocking capability in the eddy-current heating cooker at above-mentioned embodiment 1, therefore, the eddy-current heating cooker of embodiment 2 can utilize the structure identical with the eddy-current heating cooker essence of above-mentioned embodiment 1 to form.
Action and effect to the eddy-current heating cooker of the embodiments of the present invention 2 that as above form like this describe.
The procedure chart of cooking of the eddy-current heating cooker of embodiments of the present invention 2 is identical with Fig. 3 of explanation in described embodiment 1.
In addition, the 1st immersion process in process of cooking of the eddy-current heating cooker of embodiment 2, the process that boils, seethe with excitement maintenance process and the process of cooking rice over a slow fire identical with the process of cooking of the eddy-current heating cooker of above-mentioned embodiment 1, therefore, omit the explanation of these processes.That is, cooking in process of the eddy-current heating cooker of embodiment 2, different from embodiment 1 as the 2nd immersion process of the second half in immersion process.
In the eddy-current heating cooker of embodiment 2, when transferring to the 2nd immersion process from the 1st immersion process, control part 8 stops the action of inverter 7, stop applying high frequency electric and stopping the driving of heater coil to heater coil 5, and make timer 15 work, start the soak time of the 2nd immersion process, the predetermined cooling minimum time of heater coil to carry out timing.That is, the driving dwell time of 154 pairs of heater coils 5 of timer is carried out timing.
To heater coil 5, apply after high frequency electric stopping, heater coil 5 is naturally cooling, and switch element 205 is naturally cooling similarly, and their temperature separately decline.The cooling minimum time of predetermined heater coil is in the situation that the maximum temperature of the heater coil 5 producing in boil process or boiling maintenance process can not surpass the storage temperature of heater coil 5 and cool times upper limit allowable temperature (heat resisting temperature), heater coil 5 such as ceiling temperature of all size.The cooling minimum time of this predetermined heater coil be by experiment, the data that precompute such as emulation, these data are as the cooling minimum time of predetermined heater coil and pre-stored in control part 8 or timer 15.
Then, when timer 15 timing during the predetermined cooling minimum time of heater coil, from the 2nd immersion process, transfer to the process of boiling.
In the eddy-current heating cooker of the embodiment 2 as above forming like this, in the 2nd immersion process, during the predetermined cooling minimum time of heater coil, stop applying high frequency electric to heater coil 5, thus, the maximum temperature of the heater coil 5 in the process of boiling and boiling maintenance process can be suppressed to the storage temperature of this heater coil 5 and the ceiling temperature of all size etc. below upper limit allowable temperature (heat resisting temperature).Consequently, the eddy-current heating cooker of embodiment 2 is also the cooker that safety and reliability is high.
Above, as illustrated in embodiment, in the technical characterictic of eddy-current heating cooker of the present invention, can be configured to do not need as the miniaturization of the cooling fan of cooling unit or do not need cooling fan such for cooling driving mechanism (cooling unit), therefore, can make heater coil cooling in the situation that do not increase size, weight and the manufacturing cost of eddy-current heating cooker, can improve the handlability of eddy-current heating cooker and taking in property.
About the present invention; the level of detail based on is to a certain degree illustrated each embodiment; but; the disclosure of these embodiments can change in the details of structure; can, within not departing from the scope of the scope of the present invention of asking for protection and thought, the combination of the key element in each embodiment and order be changed.
Utilizability in industry
Eddy-current heating cooker of the present invention can improve quietness, handlability and taking in property when maintaining the performance of cooking, and therefore, as the cooker using in average family, restaurant etc., is useful.
Claims (6)
1. an eddy-current heating cooker, this eddy-current heating cooker has:
Cooker main body;
Pot, its handling are accommodated in described cooker main body freely;
Heater coil, it produces the induced field that described pot is heated;
Inverter, it applies high frequency electric to described heater coil;
Control part, it controls the described inverter that described heater coil is applied to high frequency electric; And
Pot temperature test section, it detects the temperature of described pot,
Described control part is configured to:
In rice being immersed in than the first half term of the immersion process in the low water of the temperature of rice gelatinization, according to the detected temperatures of described pot temperature test section, by described inverter, described heater coil is applied to high frequency electric, make described pot become predetermined soaking temperature,
In the second half of described immersion process, stop the high frequency electric that described inverter applies described heater coil and make this heater coil cooling, so that the maximum temperature of the described heater coil in the process after this immersion process becomes the temperature of the upper limit allowable temperature that is no more than described heater coil.
2. eddy-current heating cooker according to claim 1, wherein,
This eddy-current heating cooker also has the heater coil temperature detecting part that the temperature of described heater coil is detected,
Described control part is configured to: in the second half of described immersion process, stop the high frequency electric that described inverter applies described heater coil, until the detected temperatures of described heater coil temperature detecting part becomes below the cooling maximum temperature of predetermined heater coil, when the detected temperatures of described heater coil temperature detecting part reaches the described predetermined cooling maximum temperature of heater coil, transfer to next process.
3. eddy-current heating cooker according to claim 2, wherein,
The cooling maximum temperature of described predetermined heater coil is that the maximum temperature of the described heater coil in the process after described immersion process is to be no more than temperature in the situation of temperature of upper limit allowable temperature of this heater coil, the described heater coil of described immersion process while finishing.
4. eddy-current heating cooker according to claim 1, wherein,
This eddy-current heating cooker also has the timer that the driving dwell time of described heater coil is carried out to timing,
Described control part is configured to: in the second half of described immersion process, stop the high frequency electric that described inverter applies described heater coil, until the instrumentation time of described timer reaches the predetermined cooling minimum time of heater coil, when reaching the described predetermined cooling minimum time of heater coil, transfer to next process.
5. eddy-current heating cooker according to claim 4, wherein,
The cooling minimum time of described predetermined heater coil be the maximum temperature of the described heater coil in the process after described immersion process be no more than the driving that stops described heater coil in the situation of temperature of upper limit allowable temperature of this heater coil, in described immersion process the second half during.
6. according to the eddy-current heating cooker described in any one in claim 1～5, wherein,
This eddy-current heating cooker is configured to not to be had for described heater coil is carried out to cooling driving mechanism.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012149067A JP5816798B2 (en) | 2012-07-03 | 2012-07-03 | Induction heating rice cooker |
| JP2012-149067 | 2012-07-03 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103519674A true CN103519674A (en) | 2014-01-22 |
| CN103519674B CN103519674B (en) | 2017-03-29 |
Family
ID=49922299
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310273414.7A Expired - Fee Related CN103519674B (en) | 2012-07-03 | 2013-07-02 | Sensing heating cooker |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP5816798B2 (en) |
| CN (1) | CN103519674B (en) |
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| CN106724736A (en) * | 2016-11-16 | 2017-05-31 | 李国华 | Automatic watering grill pan |
| CN112710407A (en) * | 2019-10-25 | 2021-04-27 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating appliance and temperature measuring device and temperature measuring method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105078200B (en) * | 2014-05-12 | 2017-04-19 | 美的集团股份有限公司 | Electric rice cooker and control method thereof |
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| JPH09140562A (en) * | 1995-11-22 | 1997-06-03 | Toshiba Home Technol Corp | Ih jar rice cooker |
| JPH11318697A (en) * | 1998-05-19 | 1999-11-24 | Toshiba Home Techno Corp | Rice cooker |
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| CN2569697Y (en) * | 2002-10-10 | 2003-09-03 | 广东美的集团股份有限公司 | Electric cooker |
| CN2732135Y (en) * | 2004-06-25 | 2005-10-12 | 东莞济安电子有限公司 | Induction heating electric rice cooker |
| CN1943483A (en) * | 2005-10-05 | 2007-04-11 | 松下电器产业株式会社 | Electrical rice cooker |
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| CN106724736A (en) * | 2016-11-16 | 2017-05-31 | 李国华 | Automatic watering grill pan |
| CN112710407A (en) * | 2019-10-25 | 2021-04-27 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating appliance and temperature measuring device and temperature measuring method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103519674B (en) | 2017-03-29 |
| JP2014008358A (en) | 2014-01-20 |
| JP5816798B2 (en) | 2015-11-18 |
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