JP2005078823A - Induction heating cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an induction heating cooker in which roasting is completed in a short time while suppressing electrical power consumption. <P>SOLUTION: Heating coils 18, 19 to heat a heated object placed on a top plate 37 and two driving circuits to supply high-frequency electric current to the heating coils 18, 19 are provided in a cabinet 2, and a fish grilling device composed of a cooking room 4 provided with an upper part heater 8 and a lower part heater 9 is provided, and the whole heating cooker is controlled based on directions from a control circuit, and by installing a cooling fan 33 toward the rear of the driving circuit, wind is sent to the driving circuit, and the cooling fan 33 is not to be operated when only the fish grilling device is operated. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an induction heating cooker provided with a fish grilling apparatus.

Conventionally, an induction heating cooker equipped with a fish grilling device includes a heating source, a fish grilling device equipped with the heating source,
A heating coil and a drive circuit unit for the heating coil are arranged in a housing having an intake port and an exhaust port, and a cooling fan for cooling the drive circuit unit is provided along a path from the intake port to the drive circuit unit. Smoke generated by the fish roasting device as it cools directly by taking in outside air from the intake port and blowing the outside air to the drive circuit by the operation of the cooling fan that is linked to the heating coil in conjunction with the energization of the heating coil. Heat was discharged from the exhaust port to the outside of the housing. In this case, the cooling fan is driven in conjunction with the operation of the fish grilling apparatus. (For example, refer to Patent Document 1).

According to the above configuration, the cooling fan operates not only when the drive circuit unit operates, but also when the fish grilling device operates, so that the temperature inside the housing rises due to the influence of the heat generated by the heating source of the fish grilling device on the surroundings. As a result, it is possible to prevent breakage of a portion having a low heat-resistant temperature in the housing.
JP-A-2-295092 (second page, FIG. 1)

However, since the above-described induction heating cooker always takes heat of the fish grilling device by the operation of the cooling fan, the time required for cooking becomes longer and the heat of the fish grilling device is exhausted. Had the problem of consuming power.

In order to solve the above-described problems, an object of the present invention is to provide an induction heating cooker that reduces power consumption while reducing cooking time by suppressing release of thermal energy from a fish-baking apparatus. To do.

In order to achieve the above object, an induction heating cooker according to the present invention includes a casing, a top plate that covers the opening above the casing, forms an outer box together with the casing, and forms an intake port and an exhaust port A fish roasting device provided with a heating source for heating the fish, a heating coil for heating the object to be heated placed on the top plate, a drive circuit for driving the heating coil, and the drive from the intake port A cooling fan that is provided between the paths to the circuit and that cools the drive circuit by blowing air so that the cooling fan is not operated when only the fish roasting device is in operation. 1
Invention).

According to the induction heating cooker of the present invention, the cooling fan does not operate at the time of operation of only the fish grilling apparatus, and heat is discharged by natural convection, so that cooking can be performed efficiently and in a short time, and power consumption It is possible to provide an induction heating cooker that has a remarkable effect of reducing the amount of heat.

Hereinafter, a stationary induction heating cooker to which one embodiment of the present invention is applied will be described with reference to FIGS.

FIG. 1 is a perspective view of the induction heating cooker in a state where the top surface is cut open, FIG. 2 is a longitudinal sectional front view of the main part, and FIG. 3 is a transverse sectional view of the main part. As shown in FIG. 1, an inner box 3 having an opening 3 a is fixed to the inner left half of the housing 2 so as to correspond to the opening 2 a on the front surface of the housing 2. The inside of the inner box 3 is a cooking chamber 4 used for grilling fish, and a cooking plate 5 is arranged in the cooking chamber 4. The cooking plate 5 has a cooking chamber 4
The door 6 provided with the window 6a which can visually recognize is fixed, and thereby the opening 2a on the front surface is closed. The door 6 is pulled by holding the handle 6 b provided below, so that the cooking dish 5 slides inside the cooking chamber 4 and can be pulled forward together with the cooking dish 5. Further, as shown in FIG. 2, the cooking dish 5 has a vertically long shape and is deep enough to allow water to be added, and a baking table 7 is placed on the cooking dish 5 and water is used. To do. The baking table 7 is made of stainless steel, and has four leg portions 7a so that the object to be heated is at the middle height of the cooking chamber 4, and horizontal bars are arranged in parallel on the leg portions 7a. There is a mounting portion 7b.

Further, an upper heater 8 composed of a sheathed heater as a heat source is disposed above the cooking chamber 4, and a lower heater 9 is disposed between the cooking plate 5 and the baking table 7. Is provided so as not to be affected by the cooking pan 5 and the baking table 7 when it is pulled out. Further, an opening 3b (see FIG. 3) is formed on the rear surface of the inner box 3, and smoke generated by cooking fish grill is discharged from the opening 3b to the outside of the outer box 1 through an exhaust port 38 to be described later. A chimney 10 is provided. The upper heater 8 and the lower heater 9 are energized and driven by an upper heater driving circuit 12 and a lower heater driving circuit 13 which are controlled based on a control program prepared in advance by the control circuit 11 shown in FIG. Furthermore, the side wall of the cooking chamber 4 is provided with an upper temperature sensor 14 that detects the temperature in the cooking chamber 4 and a lower temperature sensor 15 that detects the presence or absence of water in the cooking pan 5 based on the ambient temperature. The above is the configuration of the fish-baking apparatus of the induction heating cooker.

On the other hand, an operation panel 16 is disposed in front of the right half of the housing 2 in FIGS. 1 and 3. The operation panel 16 has a cooking time setting, a heating power setting, and other settings necessary for induction heating cooking. Various switches that can set the cooking method are provided. The operation panel 16
On the rear side, a first PC plate 17 on which the control circuit 11 is placed, and a second PC plate 22 on which drive circuits 20 and 21 (see FIG. 4) for heating coils 18 and 19 to be described later are placed in a stepwise manner. , 24
Are arranged up and down. The drive circuits 20 and 21 each have two IGBTs 25, 26, 27, and 28 that generate high-frequency currents.
6, 27, and 28 are provided with heat radiation plates 29, 30, 31, and 32, respectively. Further, behind the PC plate supports 23 and 24, there is a cooling fan 33 and a drive motor 34 for driving the cooling fan 33. Air is sucked from an intake port 35 described later, and the first PC plate 17 and the second PC plate 2 are sucked.
2 is being cooled.

In addition, as shown in FIG. 2, two heating coils 18 and 19 that are partitioned by a case 36 and are used to heat cooking utensils are disposed above the housing 2. These heating coils 18, 1
9 is provided with a top plate 37 made of glass or ceramic or the like that covers the top of the housing 2 and constitutes the outer box 1 together with the housing 2 and on which a cooking utensil such as a pan is placed.

Behind the top plate 37 are an intake port 35 constituted by a large number of holes at a position indicated by a two-dot chain line in FIG. 3, and an exhaust port 38 constituted by a large number of holes like the intake port 35, respectively. Is formed. In addition, one end of the chimney 10 is connected to the exhaust port 38 so that the inner box 3 and the outside of the outer box 1 communicate with each other. Furthermore, the left cooking chamber 4 side, the right first PC board 17 and the second
A partition plate 39 separating the PC board 22 side is provided from the center of the housing 2 to the rear. Therefore, as indicated by arrows in FIG. 3, the outside air taken in from the intake port 35 by the cooling fan 33 is also used for cooling the heating coils 18 and 19, most of which are the first PC plate 17 and the second PC plate 22. Through the gap (arrow A), passing through the gap between the partition plate 39 behind the operation panel 16 and the cooking chamber 4 (arrow B), reaching the exhaust port 38 and being discharged. (Arrow C). Therefore, the outside air after cooling the control circuit 11 and the IGBTs 25, 26, 27, 28, etc. is led to the exhaust port 38 together with the smoke generated in the cooking chamber 4 and exhausted by the convection of heat. The

FIG. 4 is a block diagram showing an electrical configuration, and two first timers 40,
The control circuit 11 having the second timer 41 therein is electrically connected to the upper heater drive circuit 12, the lower heater drive circuit 13, and the drive circuits 20 and 21. The first timer 40
The second timer 41 is abbreviated as timer 1 and timer 2 in the figure. Furthermore, the drive circuit 20,
21 is connected to the heating coils 18 and 19, respectively, and IGBTs 25, 26, 27,
A high-frequency current generated by 28 is passed through the heating coils 18 and 19 to generate a magnetic field;
Magnetically acts on the cooking utensil placed on the top plate 37 to heat the cooking utensil. On the other hand, the upper heater driving circuit 12 and the lower heater driving circuit 13 separately drive the upper heater 8 and the lower heater 9 by energization.

A drive motor 34 is also electrically connected to the control circuit 11.
By energizing the cooling fan 33, the cooling fan 33 is driven. The control circuit 11 is also connected to an upper temperature sensor 14, a lower temperature sensor 15, and an operation panel 16. Based on input signals from these, the drive circuits 20, 21, the upper heater drive circuit 12, and the lower heater drive. The circuit 13 is controlled. Furthermore, cooking information such as heating power and cooking time is displayed on the display units 42a, 42b, and 42c provided on the operation panel 16 shown in FIG. 5 described later, and the user is notified of the end of the operation by the notification unit 43. It is possible.

FIG. 5 is a front view of the operation panel 16. A power switch 44 and three heating power adjustment knobs 45 a, 45 b, 45 c are arranged below the operation panel 16, and the left and right heating coils 18, 19 are arranged.
, The input to the upper heater 8 and the lower heater 9 and the heating power adjustment, respectively. Also, above the heating power adjustment knobs 45a, 45b, 45c, for setting the display portions 42a, 42b, 42c for displaying the setting states of the left and right heating coils 18, 19, the upper heater 8, and the lower heater. The operation key group is provided. For example, as operation keys corresponding to the left and right heating coils 18 and 19, "hour" keys 46a, 46b and "minute" for setting "hour" and "minute" are used.
In addition to the keys 47a and 47b, the "hour" keys 46a and 46b and the "minute" keys 47a and 47
“Cancel” keys 48 a and 48 b that can cancel the value set by b are displayed on the display unit 4.
2a and 42b are respectively arranged below. In addition, as an operation key of the fish grilling device,
An “automatic selection” key 49 for selecting the automatic mode and the manual mode, a “minute” key 50 for setting the cooking time when the manual mode is selected, and a “cancel” key 51 for canceling the setting are arranged below the display unit 42c. Yes.

  Next, the operation of the induction heating cooker having the above configuration will be described.

First, the power switch 44 is pressed to turn on the power. For example, when a cooking tool such as a pan to be heated is placed on the top plate 37 on the heating coil 18 side, when the heating power adjustment knob 45a disposed on the operation panel 16 is pressed, the heating power adjustment knob 45a is moved outward. Protruding. This thermal power adjustment knob 4
If 5a is rotated, the drive circuit 20 will operate | move and a high frequency current will flow into the heating coil 18, and cooking will be started. At this time, the two IGBTs 25 and 26 that are components of the drive circuit 20 generate a high-frequency current, and accordingly, the IGBTs 25 and 26 generate heat. This heat is dissipated in the heat sink 2
9 and 30 radiate heat to the surrounding atmosphere and drive the cooling fan 33 to introduce air from outside the outer box 1 to cool the drive circuit 20. Further, the adjustment of the thermal power is adjusted by the thermal power adjustment knob 45a, and the thermal power becomes stronger as it is rotated to the right. Further, when the time set by the user by operating the “hour” key 46 a and the “minute” key 47 a by the first timer 40 has elapsed from the start of cooking, the control circuit 11 automatically supplies power to the drive circuit 20. It is also possible to control to stop the supply and end the cooking.

On the other hand, the function as a fish roasting device includes an automatic mode in which cooking is automatically performed according to the form of the object to be heated and the ambient temperature, and a manual mode in which the user adjusts the heating power and cooking time to perform cooking. Yes. Therefore, the operation of the fish grilling apparatus will be described below separately for the automatic mode and the manual mode.

FIG. 6 shows a flowchart when the automatic selection mode is selected. FIG. 7 shows a timing chart when the automatic selection mode is selected. First, referring to FIG.
In step S1, when the “automatic selection” key 49 of the fish roasting device on the operation panel 16 is pressed, the menu changes in the order of “automatic” mode, “manual” mode, and standby state according to the number of times of pressing. In some cases, even in the automatic mode, the cooking method may be set in detail according to the form of the object to be heated, such as “round”, “fillet”, and “open”. If the automatic mode is selected, the process proceeds to step S2. If the manual mode is selected, the process proceeds to A through FIG. In the automatic mode, when the thermal power adjustment knob 45c provided on the operation panel 16 is pressed and the thermal power adjustment knob 45c protruding thereby is rotated to the right (step S2),
Energization of the upper heater drive circuit 12 is started, the upper heater 8 is turned on (step S3), cooking by the fish roasting apparatus is substantially started, and the baking at the time of baking is performed by the rotation of the heating power adjustment knob 45c. Color etc. can be adjusted. In step S4, the temperature T0 in the cooking chamber 4 is detected by the upper temperature sensor 14 at the start of cooking, and the first timer 40 in the control circuit 11 starts measuring time (step S5). In the automatic mode, the “minute” key 50 and the “cancel” key 51 which are time setting keys are invalidated.

Next, it is confirmed whether or not 30 seconds have elapsed from the start of timing of the first timer 40 (step S6). If it has elapsed, the temperature T1 in the cooking chamber 4 is detected by the upper temperature sensor 14 (step S7). Based on the temperature T0 at the start of cooking and the temperature T1 after 30 seconds, the driving time t1 of the upper heater 8 and the driving time t2 of the lower heater 9 are calculated, and the cooking time t3 (= t1 + t2) of the fish roasting device is determined. At the same time, the cooking time t3 is displayed on the display unit 42c (step S8).

In addition, the upper temperature sensor 14 that continues to detect the temperature in the cooking chamber 4 from the start to the end of cooking normally has a temperature detected by the upper temperature sensor 14 exceeding a predetermined temperature U0 (for example, 170 degrees). At this time, the temperature control set value U0 is determined so that the control circuit 11 stops the energization to the upper heater drive circuit 12 or the lower heater drive circuit 13 and is turned off. The time of this OFF state is, for example, 1 or 2 minutes, and when this time elapses, the upper heater drive circuit 1 is again displayed.
2 or the lower heater drive circuit 13 is energized, and then the upper heater 8 or the lower heater 9 is repeatedly turned on and off to control the temperature in the cooking chamber 4 to be kept uniform. In addition, during cooking and heating, when the temperature is detected at a position where the lower temperature sensor 15 is submerged in the water stretched on the cooking pan 5 and a high temperature exceeding 100 degrees Celsius is detected, 5 is judged to have no water, and the energization to the upper heater drive circuit 12 or the lower heater drive circuit 13 is stopped.

On the other hand, when the cooling fan 33 is operated in conjunction with the operation of the drive circuits 20 and 21, the cooling fan 3 is operated.
The cooling air from 3 hits the upper temperature sensor 14, and the detected temperature is lowered. On the other hand, the actual atmospheric temperature in the cooking chamber 4 slightly decreases, but the temperature detected by the upper temperature sensor 14 further decreases. Since the control circuit 11 tries to control the heating of the cooking chamber 4 based on the detected temperature, the temperature of the cooking chamber 4 becomes higher than necessary when the cooling fan 33 is stationary, and the expected good baked state cannot be obtained. This happens.

Therefore, when the cooling fan 33 is operating, the second timer 41 starts measuring time after the above-described step S9 (step S10), and at the same time, the control circuit 11 sets the temperature control set value U0 to an appropriate temperature lower than when the cooling fan 33 is not operating. It changes to control set value U1 (for example, 150 degreeC) (step S11), and it is made for the cooking performance to be kept constant at the time of the cooling fan 33 fixed and operation. When the cooling fan 33 stops driving (step S13), the temperature control set value U is returned to the set value U0 again to control the heating (step S14).

Moreover, as shown in the timing chart of FIG.
When induction heating cooking is performed by the heating coils 18 and 19 and the cooling fan 33 is operating along with driving of the drive circuits 20 and 21, the cooling air from the cooling fan 33 takes the heat of the cooking chamber 4 and the cooling fan. Since the amount of heating is short compared to when 33 is not operating, correction is performed as necessary to extend the cooking time in order to maintain cooking performance.

Specifically, when the cooling fan 33 is driven in conjunction with the driving of the heating coils 18 and 19 during heating by the upper heater 8 (step S9), the control circuit 11 starts measuring the second timer 41. (Step S10) The temperature control set value U0 is changed to the same set value U1 (Step S11). After that, if the cooling fan 33 stops with the heating coils 18 and 19 stopped (Step S12), the second timer 41 Timekeeping is terminated (step S13), and at the same time, the temperature control set value U1 is returned to the set value U0 (step S14). The process from step S9 to step S15 is repeated until a predetermined time t1 has elapsed (step S15).
During this time, the second timer 41 calculates the total driving time tf1 of the cooling fan 33 until t1 has elapsed, and after t1 has elapsed, the total driving time tf1 of the cooling fan 33 during t1 is multiplied by 0.2. The cooking time by the upper heater 8 is extended by t4 (step S16), and then the energization to the upper heater drive circuit 12 is stopped and the upper heater 8 is turned off (step S1).
7). When the cooling fan 33 does not operate and the total driving time tf1 is 0, t4 is also 0.
Therefore, step S16 is substantially skipped, and the upper heater is immediately turned off (step S17).

This control is similarly performed during heating by the lower heater 9. That is, step S
In 18, energization of the lower heater drive circuit 13 is started, the lower heater 9 is turned on, and the first timer 40 starts measuring time (step S 19).

The first timer 40 starts timing, and the cooling fan 33 is interlocked with the driving of the heating coils 18 and 19.
Is driven (step S20), the second timer 41 starts measuring time (step S20).
21) The temperature control set value is changed from U0 to U1 (step S22), and then
If the cooling fan 33 stops when the heating coils 18 and 19 are stopped (step S23).
) The time measurement of the second timer 41 is ended (step S24), and the temperature control set value U is returned to U0 (step S25). The process from step S20 to step S26 is as follows.
The process is repeated until the predetermined time t2 elapses (step S26). During this time, the second timer 41 calculates the total driving time tf2 of the cooling fan 33 until t2 elapses, and after t2 elapses, t2
The cooking time by the lower heater 9 is extended by a time t5 obtained by multiplying the cooling fan driving time tf2 by 0.2 by a time t5 (step S27), and then the energization to the lower heater driving circuit 13 is stopped.
The lower heater 9 is turned off (step S28), and cooking is finished. If the cooling fan 33 is not driven (step S20) and the total drive time tf2 is 0, t5 is also 0, so step S27 is substantially skipped and the lower heater 9 is immediately turned off. (Step S28), at the end of cooking, the end of cooking is displayed on the display unit 42c, or the notification unit 43 notifies the user by sound or the like.

Next, the manual mode will be described with reference to the flowchart of FIG. Also in the manual mode, after the power switch 44 is turned on, the first timer 40 is set by pressing the “minute” key 50 in step S31, as in the automatic mode described above. At this time, the set time can be set at 1 minute intervals from 1 to 30 minutes, and the setting of the first timer 40 is canceled by pressing the “cancel” key 51. Next, when the thermal power adjustment knob 45c is pushed (step S32), the thermal power adjustment knob 45c protrudes, and energization to the upper heater drive circuit 12 is started, and the upper heater 8 is turned on (step S33). Thermal adjustment knob 45
The heating power can be adjusted by rotating the heating power adjusting knob 45c by rotating c.

For example, when the predetermined time t6 is set in step 32, the energization of the upper heater drive circuit 12 is stopped when 30 seconds have elapsed (step S35) after the first timer 40 starts measuring time (step S34). To turn off the upper heater 8 (step S36).
At the same time, energization of the lower heater drive circuit 13 is started and the lower heater 9 is turned on (step S37). If another 30 seconds have elapsed (step S38), energization of the lower heater drive circuit 13 is performed. Stop and lower heater 9 is turned off (step S39). The driving time tf3 of the cooling fan 33 is measured and added (step S40), and thereafter the upper heater 8 and the lower heater 9 are alternately driven every 30 seconds for cooking, and after a predetermined time t6 has elapsed (
Further, the cooking time is extended by t7 obtained by multiplying tf3 by 0.2 (step S42).

During this extended time t7, the driving time of the cooling fan 33 is not taken into consideration, and every arbitrary time (for example,
Every 15 seconds), the upper heater 8 is turned on (step S43), and the lower heater 9 is turned off.
Heat cooking is performed by alternately repeating the state (step S44), the upper heater 8 is in the OFF state (step S45), and the lower heater 9 is in the ON state (step S46). When the extended time t7 elapses, the cooling fan 33 is not driven and cooking ends in the same manner as when the cooling fan operating time tf3 is not present.

As described above, according to the above-described embodiment, the cooling fan 33 does not operate when the fish roasting apparatus is used, so that heat is exhausted only by natural convection, so that the cooking chamber 4 can be kept at a high temperature. Thus, cooking can be performed efficiently in a short time, and at the same time, power consumption can be reduced.

Further, when the fish roasting apparatus is operating, the heating coils 18 and 19 are connected to the drive circuits 20 and 21.
In the state in which the cooling fan 33 is operated in conjunction with this, the cooling fan 33 is driven only when the upper heater 8 and the lower heater 9 are not energized to drive the fish grilling device. Since the temperature rise in the housing 2 can be effectively suppressed while maintaining the cooking performance, the drive circuit 20 includes IGBTs 25, 26, 27, 28, etc. having low heat resistance.
, 21 can be protected.

Furthermore, when the cooling fan 33 is operating, the temperature detected by the upper temperature sensor 14 is lower than the actual ambient temperature due to the influence of the cooling air. By reducing the temperature control set value U, cooking when the cooling fan is not operating is performed. Since the temperature in the chamber 4 is kept substantially constant, the cooking performance of the fish grilling device can be kept constant.

When the cooling fan 33 is operated during cooking, the grilled state of the fish can be made uniform by changing the operation time of the fish grilling apparatus.

Note that the present invention is not limited to the above-described embodiment, and may be applied to a fish-baking apparatus including only the upper heater 8, in which the cooking plate 5 needs to be taken out and the fish needs to be turned over. The value of 0.2 multiplied by the operating time of the cooling fan 33 is obtained empirically, and may be increased or decreased depending on the output of the heating source, etc. Further, the first timer 40 and the second timer 41 , Control circuit 11
The present invention can be implemented with various modifications without departing from the gist of the present invention.

The perspective view which cuts and shows the upper surface of the induction overheating cooker of this invention Longitudinal front view of main parts Cross section of the main part Block diagram showing electrical configuration Front view showing the operation panel Flow chart showing automatic mode Timing chart showing automatic mode Flow chart showing manual mode

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outer box 2 Housing | casing 3 Inner box 4 Cooking chamber 8 Upper heater 9 Lower heater 10 Chimney 11 Control circuit 12 Upper heater drive circuit 13 Lower heater drive circuit 14 Upper temperature sensor 15 Lower temperature sensor 20, 21 Drive circuit 25, 26, 27, 28 IGBT
33 Cooling fan 35 Intake port 37 Top plate 38 Exhaust port

Claims (5)

A housing, a top plate that covers the opening above the housing and forms an outer box together with the housing, and has an intake port and an exhaust port; a fish grilling device including a heating source for heating the fish; A cooling coil provided for heating an object to be heated placed on a plate, a driving circuit for driving the heating coil, and a cooling circuit provided between the intake port and the driving circuit for cooling the driving circuit by blowing air. With a fan,
The induction heating cooker characterized in that the cooling fan is not operated when only the fish roasting device is in operation. 2. The induction heating cooker according to claim 1, wherein when the fish roasting apparatus is in operation, the heating source is controlled to cut off power and the cooling fan is operated only at the time of power off. The fish roasting device comprises a control means for operating the fish roasting device according to the user's setting, and a temperature detection means,
The control means performs temperature control in the fish roasting device by energizing a heating source based on a detected temperature of the temperature detection means and a temperature control set value, and sets the temperature control set value to an operating state of a cooling fan. The induction heating cooker according to claim 1, wherein the induction heating cooker is changed according to the condition. The induction heating cooker according to claim 3, wherein the temperature control set value of the fish grilling apparatus when the cooling fan is operating is set lower than the temperature control set value of the fish grilling apparatus when the cooling fan is stopped. The fish grilling apparatus includes a control means for operating the fish grilling apparatus for a predetermined time while controlling the heating source according to the setting of the user,
2. The induction heating cooker according to claim 1, wherein when the cooling fan operates during use of the fish grilling apparatus, the control means extends the predetermined time to operate the fish grilling apparatus. .

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