JPH08159481A - Heating and cooking device - Google Patents

Abstract

PURPOSE: To enable a heated and cooked item to be heated sufficiently and well from its inner side and outer side. CONSTITUTION: A control circuit 8 has an operation course in which a first heating step under the operation of a magnetron 6 and a second heating step under the operation of heaters 9, 13 are carried out in sequence, sets a total running time of the first heating step and the second heating step in response to a result of sensing of weight obtained from a weight sensor 15 and then controls a rate between the first heating step operating time and the second heating step operating time in response to a result of sensing of a gas sensor 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating cooker adapted to sequentially perform a first heating step by a magnetron and a second heating step by a heater.

[0002]

2. Description of the Related Art Conventionally, in a heating cooker, when heating an object to be heated, for example, a cooked food, the food is first heated by a magnetron, and then the food is heated by a heater. There is something.
This heating method has the advantage that the food can be heated first from the inside and then from the outside as a whole.

However, when heating with a magnetron,
The amount of gas mainly composed of water vapor generated from food is detected by a gas sensor, and based on this detection result, the execution time of the heating step by this magnetron is determined to control the heating step, and then the heating step by the heater. Is performed for a certain period of time.

[0004]

SUMMARY OF THE INVENTION In the above conventional one,
Depending on the type of food, the food may be heated almost completely by heating with a magnetron, and the subsequent heating by the heater will cause the food to overheat and the heating balance inside and outside the food will be poor. There is a risk of uneven cooking. On the other hand, in the opposite case, the heating by the heater tends to be insufficient, resulting in insufficient heating of the food, and in this case as well, the heating balance inside and outside the food may be deteriorated and cooking unevenness may occur.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a heating cooker capable of heating food to be cooked satisfactorily both inside and outside.

[0006]

A first means is a magnetron for heating an object to be heated in a heating cooking chamber, a heater for heating the object to be heated, and an item contained in the heating cooking chamber. The weight information generating means for generating the weight information, the operation course for sequentially executing the first heating step by the magnetron and the second heating step by the heater, and the weight information from the weight information generating means Based on this, the total execution time of the first heating process and the second heating process is set, and the ratio between the execution time of the first heating process and the execution time of the second heating process is controlled by a predetermined condition. And a control means (the invention of claim 1).

The second means has a menu selection switch in the first means, and the control means determines the execution time of the first heating step and the second heating step based on the selection result by the menu selection switch. The feature is that the ratio to the execution time is controlled (the invention of claim 2).

A third means is the first means, further comprising a freezing / non-freezing selection switch for designating whether the food to be heated is a frozen food or a non-frozen food, and the control means comprises: When the frozen food is designated by the freezing / non-freezing selection switch, the execution time of the first heating process is controlled to be longer than when the non-frozen food is designated (claim). Invention of 3).

The fourth means is characterized in that, in the first means, the weight information generating means is composed of a weight sensor (the invention of claim 4).

A fifth means is the same as the first means, except that when the control means has a long execution time of the first heating step, the second means
The invention is characterized in that the heater output in the heating process of (1) is increased at the final stage (invention of claim 5).

A sixth means is provided with a gas sensor for detecting the amount of gas generated from the food to be cooked in the first means, and the control means performs the first heating process based on the detection result by the gas sensor. It is characterized in that the ratio of the execution time and the execution time of the second heating step is controlled (the invention of claim 6).

According to a seventh means, in the sixth means, the control means sequentially calculates the gas amount change rate from the gas amount detected by the gas sensor during the first heating stroke, and the gas amount change rate is the first predetermined value. When the predetermined first reference value is reached within the reference time, the first heating process is terminated at this point, and the gas amount change rate is longer than the first reference time. When the predetermined second reference value is reached within the time, the first heating process is terminated at this point, and the gas amount change rate exceeds the second reference time without reaching the second reference value. In that case, the first heating step is terminated when the rate of change in gas amount reaches the second reference value thereafter (invention of claim 7).

[0013]

When the food to be heated is cooked, the time required for cooking without insufficient heating can be roughly estimated by its weight. In order to achieve a good heating balance inside and outside the food to be cooked, the first heating step by the magnetron and the second heating step by the heater are performed according to factors other than the weight of the food to be heated. It is preferable to change the ratio of the execution time.

In the first means, the total execution time of the first heating process and the second heating process, that is, the total cooking time is set based on the weight information from the weight information generating device. It is possible to heat the cooked food without any shortage. In this case, the ratio of the execution time of the first heating process by the magnetron to the execution time of the second heating process by the heater is controlled by a predetermined condition, so that the heating target can be maintained while keeping the set total cooking time. The cooked food can be heated well from the inside and outside.

In the second means, the ratio between the execution time of the first heating process and the execution time of the second heating process is controlled based on the selection result by the menu selection switch, so that cooking A time ratio suitable for the contents is set, and the configuration for specifying the time ratio is simplified.

In the third means, when the frozen food is designated by the frozen / non-frozen selection switch, the execution time of the first heating step is controlled to be longer than when the non-frozen food is designated. Therefore, frozen food can be heated well. In the fourth means, since the weight information generating means is composed of the weight sensor, the user does not need to input the weight information, and the operation becomes simple.

In the fifth means, the control means is arranged to increase the heater output in the second heating step at the final stage when the execution time of the first heating step is long, so that even better heating is achieved. Is possible. In the sixth means, the ratio of the execution time of the first heating process and the execution time of the second heating process is controlled based on the detection result of the gas sensor, so that the time ratio is automatically controlled. It becomes possible to perform the input operation on the user side.

In the seventh means, the gas amount change rate is sequentially calculated from the gas amount detected by the gas sensor during the first heating stroke, and the gas amount change rate is within a predetermined first reference time. When the reference value of 1 is reached, the first heating process is finished at this point, and the predetermined second reference time is reached until the second reference time in which the gas amount change rate is longer than the first reference time. When the reference value is reached, the first heating step is ended at this point, and when the gas amount change rate exceeds the second reference time without reaching the second reference value, the first heating step is reached at this point. The heating balance is further improved when the food to be heated is further heated from inside and outside.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. First, in FIGS. 2 to 4, the main body 1 is composed of a main body case 2 and an inner box 3, the inside of the inner box 3 is a cooking chamber 4, and the main case 2 and the inner box 3 are combined. A machine room 5 is formed between them.

In the machine room 5, a magnetron 6 and a fan 7 are arranged, and a room temperature sensor 8 is arranged. The fan 7 includes blades 7a and a fan motor 7b.
The magnetron 6 is cooled by its air blowing action, and the heating tube 4 is heated from the air guide tube 3a.
It is designed to supply wind inside. The magnetron 6 supplies microwaves into the cooking chamber 4 through a waveguide (not shown). A room temperature sensor 8 is provided in the machine room 5.

An upper heater 9 serving as a heater is arranged above the cooking chamber 4, and an exhaust passage 10 is formed on the side. A gas sensor 11 having high sensitivity to water vapor is arranged in the exhaust passage 10. The gas sensor 11 is for detecting water vapor which is a gas generated by the food to be heated in the cooking chamber 4.

Further, a rotary net 12 is provided at the inner bottom of the heating and cooking chamber 4, and a lower heater 13 as a heater is provided at the outer bottom. Further, a turntable motor 14 for rotating the rotary net 12 is provided below the bottom of the heating and cooking chamber 4, and a weight sensor 15 as weight information generating means is provided. The weight sensor 15 detects the weight of an item contained in the heating cooking chamber 4, that is, an item placed on the rotary net 12 (only the item to be cooked, or the item to be cooked and the container). On the other hand, an operation panel 1a is provided on the front surface of the main body 1, and a display 16 and various switches 17 are provided on the operation panel 1a.

Next, FIG. 1 shows an electrical configuration.
The control circuit 18 is configured to include an A / D converter and a microcomputer, which is input to the room temperature sensor 8, the gas sensor 11, the weight sensor 15 and various switches 17 according to an operation program stored in the internal memory. Accordingly, the magnetron 6, the fan motor 7b, the upper heater 9, the lower heater 13 and the turntable motor 14
Is controlled via the drive circuit 19, and the display 16 and the buzzer 20 are also controlled.

In this embodiment, the control circuit 18 is
It also functions as a control means. This control circuit 1
The control content of No. 8 will be described with reference to FIG. The flowchart of FIG. 5 starts when, for example, the "warm" switch of the various switches 17 is operated and the start switch is operated. When this "warm up" switch is operated, as will be apparent from the later description, the first heating process by the magnetron 6 and the upper heater 9 and the lower heater 1 are performed.
The heating cooking is controlled in the operation course in which the second heating process of 3 is sequentially executed.

First, in step S1, the detected temperature T0 from the room temperature sensor 8 is read, and in step S2, the correction coefficient K0 of the gas sensor 11 is calculated based on this detected temperature T0. This correction coefficient K0 is a function of T0.

Then, in step S3, the cleaning operation is executed for a predetermined time. That is, the fan motor 7b is driven to send the outside air into the cooking chamber 4 to discharge it. As a result, the residual gas inside the cooking chamber 4 is discharged.

Thereafter, in step S4, the weight detection result, which is weight information by the weight sensor 15, is read,
As shown in steps S5 and S6, whether or not the weight of the food to be heated exceeds "100 g", "2
It is determined whether or not it exceeds "00g". Then
If "100 g" or less, the process proceeds to step S7 according to "N" in step S5, and the total cooking time is set to "6 minutes". If the weight of the food to be heated exceeds "100 g" and "200 g" or less, the process proceeds to step S8 according to "N" in step S6, and the total cooking time is set to "8 minutes". Furthermore, the weight of the cooked food is "200.
If it exceeds "g", the process proceeds to step S9 according to "Y" in step S6, and the total cooking time is set to "10 minutes".

After that, in step S10, the magnetron 6 is driven to start the first heating step and the time count (time Ta) is started. The magnetron 6 heats the food to be heated (dielectric heating) to generate water vapor. Next, in step S11, the gas amount V detected by the gas sensor 11 is read,
In step S12, it is determined whether or not the detected gas amount is the maximum value, that is, it is determined whether or not the detected gas amount V of this time is smaller than the detected gas amount V of the previous time, and the detected gas amount has become smaller. Is determined, the process proceeds to step S13 and the previously detected gas amount V is stored as the maximum value Vmax.

Thereafter, the gas amount V detected by the gas sensor 11 is read again in step S15, and the gas amount change rate ΔV is calculated in step S9. This ΔV is calculated by ΔV = K0 (Vmax−V) / Vmax.

In step S16 and step S17, the gas amount change rate ΔV becomes the first value until the elapsed time T0 from the start of heating by the magnetron 6 exceeds the first reference time, for example, "60 seconds". It is determined whether or not the reference value of, for example, "0.05" is reached.

Here, FIG. 9 shows the rate of change in the gas amount of the cooked food. The cooked food is in the chilled or normal temperature pizza (one piece) and in the frozen temperature. There are two large-sized grills and six large-sized grills in the freezing temperature state.

The rate of change in gas amount ΔV is now the magnetron 6
If the first reference value, eg, “0.05”, is reached before the elapsed time T0 from the start of heating by the time exceeds the first reference time, eg, “60 seconds”, step S16.
According to “Y” of No., the process proceeds to step S22 (described later). In this case, as can be seen from FIG. 9, this routine is followed when the food to be heated is pizza.

On the other hand, when the elapsed time T0 from the start of heating by the magnetron 6 exceeds "60 seconds" without the gas amount change rate ΔV reaching the first reference value "0.05", for example, , According to “N” in step S17, the process proceeds to steps S18 and S19. Step S
In 18, the gas amount V detected by the gas sensor 11 is read again, and in step S19, the gas amount change rate ΔV is calculated.

Next, in step S20 and the next step S21, the gas amount change rate ΔV is set until the elapsed time T0 from the start of heating by the magnetron 6 exceeds the second reference time, eg, “120 seconds”. It is determined whether or not the second reference value "0.10" is reached,
If reached, the step S is performed according to “Y” in the step S20.
Move to 22. In this case, as can be seen from FIG. 9, this routine is followed when the food to be heated is two frozen large-sized grills.

Further, the elapsed time T0 from the start of heating by the magnetron 6 while the gas amount change rate ΔV does not reach the second reference value, eg, “0.10”, is the second reference time, eg, “120”. If it exceeds "seconds", the process proceeds to step S22 according to "N" in step S21. In this case, as can be seen from FIG. 9, this routine is followed when the food to be heated is six frozen large-sized grills.

In step S22, the driving of the magnetron 6 is stopped and the first heating process is completed. Next, in step S23, the upper heater 9 and the lower heater 13
Is energized to start the second heating step. In this case, the upper heater 9 is fully energized, and the lower heater 13 is energized at a duty ratio of ⅔ (20 seconds for energization and 10 seconds for disconnection).

Then, the process proceeds to step S24, and the elapsed time from the start of heating is step S7 or step S
8 or it is judged whether or not the total cooking time set in step S9 has been reached, and if reached, the upper heater 9 and the lower heater 1
3 is cut off and the second heating process is completed.

In this embodiment, the cooking time is set to "6 minutes" when the food to be heated is the aforementioned pizza and the weight thereof is 100 g or less. Then, as can be seen from the characteristic line A of FIG. 9 and FIG. 6, the magnetron 6
The first heating stroke by the heater is performed in about 50 seconds, and the second heating stroke by the heaters 9 and 13 is performed in 5 minutes and 10 seconds. Therefore, in this case, it can be said that the ratio of the execution time of the first heating process to the execution time of the second heating process is controlled to "5:31".

In the case of this pizza, since it contains cheese, the amount of gas generated is large, that is, the rate of change in gas amount Δ
Since V is large, the execution time of the first heating step by the magnetron 6 becomes relatively short. As a result, the heaters 9 and 13
The second heating step is performed for a longer time, that is, the pizza is heated from inside and outside in a well-balanced manner, and the pizza is cooked in a refreshed finished state. Since the total cooking time is set to "6 minutes" suitable for a pizza weighing 100 g or less, this cooked food can be cooked without insufficient heating.

When the food to be heated is the above-mentioned two frozen large-sized grills and the total weight thereof is between 100 g and 200 g or less, the total cooking time is set to "8 minutes". Then, as can be seen from the characteristic line B of FIG. 9 and FIG. 7, the first heating step by the magnetron 6 is almost 100
Second heating stroke by the heaters 9 and 13 is performed in 6 minutes and 20 seconds. Therefore, in this case, it can be said that the ratio of the execution time of the first heating process and the execution time of the second heating process is controlled to "5:19". In the case of this frozen large-sized grill, the inside of the large-sized grill is heated until it becomes warm, and then the outside is heated, that is,
The large-sized grill is well-balancedly heated from the inside and outside, so that the inside is softly heated and the outside has a crisp finish. And because the total cooking time is set to "8 minutes", which is suitable for two frozen large-sized grills,
This cooked food can be cooked without insufficient heating.

Furthermore, when the food to be heated is the above-mentioned six frozen large-sized grills and the total weight thereof is more than 200 g, the total cooking time is set to "10 minutes". And
As can be seen from the characteristic line C of FIG. 9 and FIG. 8, the first heating step by the magnetron 6 is executed in approximately 2 minutes, and the second heating step by the heaters 9 and 13 is executed in 8:00 minutes. Therefore, in this case, it can be said that the ratio between the execution time of the first heating process and the execution time of the second heating process is controlled to "5:20". In the case of this frozen large-sized grill,
After the inside of the large-sized grill is heated until warm,
The outside is heated, that is, the large-sized grill is heated from inside and outside in a well-balanced manner, so that the inside is gently heated and the outside has a crisp finish. And the total cooking time is "10
By setting to "minute", this cooked food can be cooked without insufficient heating.

As described above, according to the present embodiment, the first heating step by the magnetron 6 and the heaters 9 and 1 are performed based on the weight detection result from the weight sensor 15 which is the weight information generating means.
Since the total execution time of the second heating step of 3 and the total cooking time are set, the food to be heated can be heated without deficiency. In this case, the first by the magnetron 6
Since the ratio of the execution time of the heating process of 1 to the execution time of the second heating process by the heaters 9 and 13 is controlled under a predetermined condition, the cooked food can be heated while keeping the set total cooking time. It becomes possible to satisfactorily heat from the inside and outside, and therefore, the food to be heated can be cooked extremely satisfactorily.

In particular, according to this embodiment, since the weight information generating means is composed of the weight sensor 15, the user does not need to input the weight information and the operation becomes simple. Further, according to the present embodiment, the ratio of the execution time of the first heating process and the execution time of the second heating process is controlled based on the detection result of the gas sensor 11, so that the time ratio is automatically calculated. It becomes possible to control manually, and it is possible to eliminate the input operation on the user side.

In addition, during the first heating stroke, the gas sensor 11
The gas amount change rate ΔV is sequentially calculated from the detected gas amount by
This gas amount change rate ΔV is the predetermined first reference time (60
When the predetermined first reference value (0.05) is reached during the time period up to the second), the first heating process is terminated at this point, and the gas amount change rate ΔV is longer than the first reference time. When the predetermined second reference value (0.1) has been reached within the second reference time (120 seconds), the first heating step is terminated at this point, and the gas amount change rate becomes the second reference value (0.1). When the second reference time is exceeded without reaching the reference value of
Since the heating process of (3) is finished, the heating balance is further improved when the food to be heated is further heated from inside and outside.

FIG. 10 shows a second embodiment of the present invention. In this embodiment, when the execution time of the first heating step is long, for example, when it exceeds "120 seconds",
The output of the heaters 9 and 13 in the second heating step is increased at the final stage (60 seconds before the end). According to this embodiment, the outside of the food to be heated has a crisp finish.

The present invention is not limited to the above-mentioned embodiments,
You may implement as follows (a) (b). (A) A menu selection switch is provided, and the control means controls the ratio between the execution time of the first heating process and the execution time of the second heating process based on the selection result by the menu selection switch. good. In this way, the time ratio suitable for the cooking content is set, and the configuration for specifying the time ratio is simplified.

(B) A freezing / non-freezing selection switch for designating whether the food to be heated is frozen food or non-frozen food is provided, and the control means is frozen by this freezing / non-freezing selection switch. When the food is designated, the execution time of the first heating process may be controlled longer than when the non-frozen food is designated. In this way, the frozen food can be heated well.

In addition, the present invention may be modified as follows. The weight information generating means may be a weight designation switch operated by the user. The total cooking time is not limited to three levels, and may be set more finely.

[0049]

As is apparent from the above description, the present invention can obtain the following effects. According to the invention of claim 1, the first information is generated based on the weight information from the weight information generating means.
Since the total execution time of the heating process and the second heating process, that is, the total cooking time is set, the food to be heated can be heated without deficiency. And the first by magnetron
Since the ratio of the execution time of the heating process of 1 to the execution time of the second heating process by the heater is controlled under a predetermined condition, the cooked food can be kept inside and outside while keeping the set total cooking time. Can be heated well.

According to the second aspect of the invention, the ratio between the execution time of the first heating process and the execution time of the second heating process is controlled based on the selection result by the menu selection switch. The time ratio suitable for the cooking content is set, and the configuration for specifying the time ratio is simplified.

According to the third aspect of the present invention, when the frozen food is designated by the freezing / non-freezing selection switch, the execution time of the first heating step is controlled to be longer than when the non-frozen food is designated. Therefore, frozen food can be heated well. ◎ According to the invention of claim 4,
Since the weight information generating means is composed of the weight sensor, the user does not need to input the weight information, and the operation becomes simple.

According to the fifth aspect of the present invention, the control means further increases the heater output in the second heating step at the final stage when the execution time of the first heating step is long. Good heating is possible.

According to the sixth aspect of the invention, the execution time of the first heating step and the second time of the second heating step are determined based on the detection result of the gas sensor.
Since the ratio with the execution time of the heating process is controlled, the time ratio can be automatically controlled, and the input operation on the user side becomes unnecessary.

According to the invention of claim 7, the gas amount change rate is sequentially calculated from the gas amount detected by the gas sensor during the first heating stroke, and the gas amount change rate is within a predetermined first reference time. When the predetermined first reference value is reached, the first heating process is terminated at this point, and the gas amount change rate is set to a predetermined second reference time longer than the first reference time. When the second reference value is reached, the first heating process is terminated at this point, and when the gas amount change rate exceeds the second reference time without reaching the second reference value, the first heating step is performed at this point. Since the heating process of (3) is finished, the heating balance is further improved when the food to be heated is further heated from inside and outside.

[Brief description of drawings]

FIG. 1 is a block diagram of an electrical configuration showing an embodiment of the present invention.

FIG. 2 is a perspective view of a heating cooker.

FIG. 3 is a cutaway plan view.

[Figure 4] Vertical side view

FIG. 5 is a flowchart showing the control contents of the control circuit.

FIG. 6 is a diagram showing an example of a heating situation.

FIG. 7 is a diagram showing another example of heating status.

FIG. 8 is a diagram showing still another example of the heating situation.

FIG. 9 is a diagram showing a gas amount change rate of each cooked food.

FIG. 10 is a view corresponding to FIG. 8 showing a second embodiment of the present invention.

[Explanation of symbols]

4 is a cooking chamber, 6 is a magnetron, 8 is a room temperature sensor,
Reference numeral 9 is an upper heater (heater), 11 is a gas sensor, 13 is a lower heater (heater), and 18 is a control circuit (control means).

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location H05B 6/64 Z 6908-3K

Claims (7)

[Claims] 1. A magnetron for heating an object to be heated in a heating cooking chamber, a heater for heating the object to be heated, and a weight information generating means for generating weight information of an object contained in the heating cooking chamber. And a first heating stroke by the magnetron and a second heating stroke by the heater in order, and the first heating stroke and the second heating stroke based on the weight information from the weight information generating means. And a heating means which sets a total execution time of the first heating step and a second heating step and controls the ratio of the execution time of the first heating step and the execution time of the second heating step according to a predetermined condition. vessel. 2. A menu selection switch is provided, and the control means controls the ratio of the execution time of the first heating process and the execution time of the second heating process based on the selection result by the menu selection switch. The cooking device according to claim 1, wherein 3. A frozen / non-frozen selection switch for designating whether the food to be heated is a frozen food or a non-frozen food, and the control means uses the frozen / non-frozen selection switch to freeze the frozen food. 2. The heating cooker according to claim 1, wherein the execution time of the first heating step is controlled to be longer when the item is specified than when the non-frozen food item is specified. 4. The cooking device according to claim 1, wherein the weight information generating means is composed of a weight sensor. 5. The control means is adapted to increase the heater output in the second heating step at the final stage when the execution time of the first heating step is long. Heating cooker. 6. A gas sensor for detecting the amount of gas generated from the food to be heated is provided, and the control means executes the execution time of the first heating step and the execution of the second heating step based on the detection result of the gas sensor. The heating cooker according to claim 1, wherein a ratio with respect to time is controlled. 7. The control means sequentially calculates a gas amount change rate from the gas amount detected by the gas sensor during the first heating stroke,
When the rate of change of the gas amount reaches the predetermined first reference value within the period of the predetermined first reference time, the first heating step is terminated at this point, and the rate of change of the gas amount is the first value. Within a predetermined second reference time, which is longer than the reference time, within a predetermined second
The first heating process is ended at this point when the reference value of is reached, and the first heating step is performed at this point when the gas amount change rate exceeds the second reference time without reaching the second reference value. The cooking device according to claim 6, wherein the cooking process is completed.