JP2011064387A - High-frequency heating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To change a rotational frequency of a hot-air fan for circulating hot air without affecting heating of a heated object, in a heating cooker including a hot-air circulation type oven heating function. <P>SOLUTION: In the heating cooker in which a heating chamber 28 is disposed in a body 1, a hot-air unit 12 for circulating and heating the air in the heating chamber is disposed on a back wall surface 28b of the heating chamber, a temperature detecting means 85 is disposed in the heating chamber, the hot-air fan 32 and a hot-air heater 12a for heating the circulated air are disposed in the hot-air unit 12, an operating section 6 is disposed on a front face of the body 1, and a control means 7 is disposed in the body 1 for rotating the hot-air fan 32 to keep a temperature of the heating chamber at a cooking temperature set from the operating section 6, comparing a detection value input from the temperature detecting means 85 with a control value for determining electric power to the hot-air heater 12a corresponding to the set cooking temperature, and controlling ON/OFF of electric power distribution to the hot-air heater 12a, the control means 7 includes the control value corresponding to the rotational frequency of the hot-air fan 32 for every cooking temperature. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a heating cooker provided with an oven heating unit that circulates hot air to heat and cook an object to be heated.

  Rotating a hot air fan that circulates hot air in a heating chamber that houses a heated object and a hot cooker that circulates the air in the heating chamber on the back of the heating chamber to heat and cook the heated object It is known that the drying of an object to be heated can be reduced by reducing the number, and the heating cooking device described in Patent Document 1 is capable of reducing the number of rotations of a hot air circulation fan (hot air fan) during low heating of an oven. It reduces the flow rate of hot air to prevent drying of the heated object and makes the flavor good, and it is designed to improve the quality by giving enough bulge to cook the shaped fermented product. is there.

Japanese Patent Laid-Open No. 62-299634

  2. Description of the Related Art In recent years, in a cooking device equipped with an oven heating means, there have been increasing demands for improving basic performance as a cooking device, shortening the time required for cooking, and reducing power used for cooking.

  Patent Document 1 described above reduces the number of rotations of the hot air circulation fan (hot air fan) during low heating of the oven to lower the hot air flow velocity, thereby improving the flavor of the heated object and cooking the shaped fermented product. Describes a cooking process using bread dough (about 40 ° C.) and a cream puff skin (about 160 ° C.) as examples of cooking to improve the quality by giving enough bulge.

  However, the cooking performed by reducing the rotational speed of the hot air circulation fan introduced in Patent Document 1 is performed when the heating cooking chamber is heated under the same conditions when the rotational speed of the hot air circulation fan is reduced. The amount of air that circulates between the cooking chamber and the wind speed decreases, the amount of hot air that flows through the cooking chamber and the wind speed also decrease, and the heating chamber temperature rises relative to the set cooking temperature and heats up. There is a problem of adversely affecting the food.

  The present invention has been made in order to solve the above-described problems, and includes a heating chamber for storing an object to be heated in a main body, and heats the heating chamber by circulating air from the heating chamber to the inner wall surface of the heating chamber. The heating chamber is provided with temperature detecting means for detecting the temperature in the heating chamber, and is arranged between the heating chamber and the hot air unit at a substantially central portion and top and bottom of the inner wall surface of the heating chamber. An air intake hole and a blowout hole for circulating air are provided, and an air passage communicating with the air intake hole and the blowout hole is formed between the inner wall surface of the heating chamber and a hot air case constituting an outer shell of the hot air unit, The air passage is provided with a hot air fan that circulates the air at a position facing the intake hole, and a hot air heater that heats the air at a position facing the blowout hole. Set cooking temperature and cooking time to heat An operating unit is provided, and the detected value input from the temperature detecting means is set in the main body so as to keep the cooking chamber temperature set by the operating unit by rotating the hot air fan. In a heating cooker provided with a control means for performing ON / OFF control of power supply to the hot air heater in comparison with a control value for determining electric power to the hot air heater corresponding to a cooking temperature set by an operation unit The control means includes a control value corresponding to the number of rotations of the hot air fan for each cooking temperature.

  According to the present invention, by providing a control value that determines the supply of electric power to the hot air heater according to the cooking temperature and the rotational speed of the hot air fan, the hot air fan rotates according to the state of the object to be heated and the heating process. Even if the number is changed, the temperature of the heating chamber can always be kept at the set cooking temperature.

It is the perspective view which looked at the main body of the cooking-by-heating machine of the present invention from the front side. It is the perspective view which looked at the main body of the heating cooker from the back side. It is AA sectional drawing of FIG. It is a perspective view in the state where the door of the cooking device of the present invention is opened and the inside of the main body can be seen. It is a perspective view which shows schematic structure inside the hot-air unit of the heating cooker. It is a block diagram for demonstrating the control circuit of the heating cooker. It is operation | movement explanatory drawing of the control means of the heating cooker. It is a whole flowchart of oven heating with preheating of the heating cooker. It is a detailed flowchart showing the process of the preheating 1 of the heating cooker. It is a detailed flowchart showing the process of the preheating 2 of the heating cooker. It is a detailed flowchart showing the process of cooking of the heating cooking device. It is a perspective view of the state which mounted the to-be-heated material in the square plate in the same heating cooker. It is a perspective view of the state which mounted the to-be-heated material in the square dish with a leg in the heating cooker. It is a detailed flowchart showing the process of cooking of the heating cooking device.

  Embodiments of the present invention will be described below with reference to FIGS.

  In the figure, the main body 1 of the heating cooker puts food in a heating chamber 28 and cooks using microwaves or the heat of a heater.

  The door 2 opens and closes to put food in and out of the heating chamber 28. By closing the door 2, the heating chamber 28 is hermetically sealed to prevent leakage of microwaves used when cooking food. It is possible to contain the heat of cooking and cook efficiently.

  The handle 9 is attached to the door 2 and facilitates opening and closing of the door 2, and has a shape that can be easily grasped by a hand.

  The glass window 3 is attached to the door 2 so that the state of the food put in the heating chamber 28 can be confirmed, and uses glass that can withstand high temperatures due to heat generated by a heater or the like.

  The operation unit 6 is provided on the operation panel 4 below the front surface of the door 2. The operation unit 6 includes a microwave heating setting key 6a for setting microwave heating and a heater heating setting key for setting oven heating with preheating. A key for selecting cooking such as 6b, a setting dial 6d for setting the cooking temperature and cooking time when the heater heating is selected, and a start key 6c for starting heating are provided.

  The display unit 5 displays the content input from the operation unit 6 and the progress of cooking.

  The outer frame 14 is a cabinet that covers the upper surface and the left and right side surfaces of the main body 1 of the heating cooker.

  The rear plate 10 forms the rear surface of the cabinet described above. An external exhaust duct 18 is attached to the upper portion of the rear plate 10, and steam exhausted from food and internal components of the main body 1 are installed inside the external exhaust duct 18. An exhaust hole 36 for discharging cooling air (waste heat) 39 after cooling is provided.

  The external exhaust duct 18 discharges the cooling air (waste heat) that has passed through the exhaust hole 36 to the outside of the main body 1. The exhaust is discharged from the external exhaust port 8 of the external exhaust duct 18, and the exhaust discharge direction Exhausts toward the top of the body 1 and to the front side. The exhaust direction is directed upward and toward the front side, so that the wall surface is not soiled by the exhaust even when the rear surface is brought close to the wall surface.

  The machine room 20 is provided in a space portion between the heating chamber bottom face 28a and the bottom plate 21 of the main body 1. On the bottom plate 21, a magnetron 33 for heating food, a waveguide 47 connected to the magnetron 33, A control board 23, other various components described later, a fan device 15 for cooling these various components, and the like are attached.

  The heating chamber bottom surface 28a has a substantially concave central portion, in which the rotating antenna 26 is installed, and the microwave energy radiated from the magnetron 33 is output from the waveguide 47 and the rotating antenna driving means 46. It flows into the lower surface of the rotating antenna 26 through the opening 47a through which 46a passes, and is diffused by the rotating antenna 26 and radiated to the heating chamber 28. The rotating antenna 26 is connected to the output shaft 46 a of the rotating antenna driving means 46.

  The fan device 15 sucks outside air from the bottom plate 21, blows cooling air 39 from the blowout port 53, cools the magnetron 33, the inverter board 22, the weight detection means 25, etc. of the machine room 20, and the heating chamber 28. Between the outer frame 14 and the outer frame 14 and between the hot air case 11 a and the rear plate 10, passing through the exhaust hole 36 while cooling the outer frame 14 and the rear plate 10, and discharged from the external exhaust port 8 of the external exhaust duct 18. The

  The hot air unit 12 is attached to the rear part of the heating chamber 28. The hot air unit 12 is provided with a hot air case 11a on the rear side of the heating chamber inner wall surface 28b, and an air passage formed by the heating chamber inner wall surface 28b and the hot air case 11a. The hot air fan 32 is provided in 11c, and the hot air heater 12a is provided so as to be located on the outer peripheral side, the hot air motor 12b is attached to the rear side of the hot air case 11a, and the motor shaft is connected to the hot air fan 32 through a hole provided in the hot air case 11a. It is connected.

  And, in order to efficiently circulate the air in the heating chamber 28 by the hot air fan 32 attached in the hot air unit 12, an intake hole 31 serving as a passage for the air is formed at a substantially central portion and above and below the heating chamber inner wall surface 28b. A blowout hole 30 is provided.

  Further, the hot air heater 12 a provided in the hot air unit 12 heats the air circulating inside the heating chamber 28 and the hot air case 11 a by the hot air fan 32.

  A grill heater 13 is attached to the back side of the top surface of the heating chamber 28. The grill heater 13 is formed in a flat shape by wrapping a heater wire around a mica plate, pressing it against the back side of the top surface of the heating chamber 28, and heating the top surface of the heating chamber 28 to radiate heat to the food in the heating chamber 28. It is something to bake.

  Further, a temperature detection means 85 for detecting the temperature of the heating chamber 28 is provided above the rear portion of the heating chamber 28.

  The temperature detecting means 85 is provided at a position where it is not directly affected by hot air blown into the heating chamber 28 from the blow hole 30 of the grill heater 13 and hot air unit 12.

  The temperature detection means 85 uses a thermistor whose resistance value changes with temperature (the resistance value decreases as the detection temperature increases).

  On the other hand, the heating chamber bottom surface 28a is provided with a plurality of weight detection means 25, for example, a right side weight sensor 25a, a left side weight sensor 25b on the front left and right sides, and a back side weight sensor 25c on the rear side center. Is placed.

  The table plate 24 is for placing food, has heat resistance so that it can be used for both heater heating and microwave heating, has good microwave permeability, and has no problem in terms of hygiene. It is molded with materials such as porcelain.

  Next, details of the hot air unit 12 will be described with reference to FIGS. 3 and 5.

  The hot air unit 12 is provided with a hot air fan 32 in a substantially central portion, and circulates the air in the heating chamber 28 through the intake holes 31 and the blowout holes 30 provided in the heating chamber inner wall surface 28b. The hot air fan 32 rotates by driving a hot air motor 12b attached to the outside of the hot air case 11a.

  Inside the hot air unit 12, a horizontally long hot air heater 12 a is provided so as to be located on the leeward side of the hot air fan 32, and the air sucked by the hot air fan 32 is provided on the lower side and the upper side of the intake hole 31 on the upper and left and right sides. An air guide plate 11b for blowing air uniformly from the provided blow holes 30 is attached.

  Thus, the hot air unit 12 heats the heating chamber 28 by sucking the air in the heating chamber 28 with the hot air fan 32, heating the sucked air with the hot air heater 12a, and then repeatedly blowing air to the heating chamber 28. .

  Further, the hot air motor 12b is provided with a circuit for phase control in the control means 7 described later so that the rotation speed can be changed by using a bear removing motor.

  Next, the whole system of the heating cooker will be described with reference to FIG. 6 using a block diagram.

  In the figure, the power source 76 is a commercial power source. The current detection means 75 detects the current used in the main body 1 of the heating cooker and inputs the current value used to the control means 7.

  The range heating means 77 is an inverter board 22 on which an inverter circuit that creates a power source for driving the magnetron 33 and the magnetron 33 is mounted. The inverter circuit creates a power supply corresponding to the heating power input from the operation unit 6 via the control means 7 and applies it to the magnetron 33. As described above, the generated power source monitors the power source 76 with the current value input from the power source detecting means 75 so that the microwave output of the magnetron 33 is not affected by the fluctuation of the power source 76, and the fluctuation amount of the current value is detected. The inverter circuit is operated so as to correct.

  The cooling means 50 is a motor that drives a fan for cooling the fan device 15.

  The rotating antenna driving means 46 is a motor for driving the rotating antenna 26, and a synchronous motor and a gear for decelerating the rotation speed are integrated.

  The temperature detection means 85 uses a thermistor whose internal resistance changes as the heating chamber 28 is heated by the hot air heater 12a or the grill heater 13.

  The temperature detecting means 85 is connected in series to the power source Vcc and the fixed resistor R so that the voltage V generated at the connection point between the temperature detecting means 85 and the fixed resistor R can be input to the control means 7. Has been. Further, the control means 7 can detect the resistance change of the temperature detection means 85 by the change of the voltage V, and the input voltage V (analog value) is digitally converted and detected as a detection value Tp.

  As for the detection value Tp, when the temperature of the heating chamber 28 is low, the resistance value of the temperature detection means 85 increases, so the voltage V decreases, and the detected value Tp decreases. When the temperature of the heating chamber 28 is high, the resistance value of the temperature detecting means 85 is small, so that the voltage V is large and the detected value Tp is large.

  The weight detection means 25 includes a right weight sensor 25a, a left weight sensor 25b provided at the front right and left, and a back weight sensor 25c provided at the rear center connected to the control means 7, respectively. The weights detected by the weight sensors are summed, and the weight of the table plate 24 is tared from the weight obtained by summing up the weights so that the weight of the object to be heated placed on the table plate 24 can be detected.

  In addition, the control means 7 operates to cook food according to the contents input from the operation unit 6. The detection means such as the weight detection means 25 and the temperature detection means 85 can detect the state of the food and the heating chamber 28. After that, the driving means such as the grill heater 13, the hot air heater 12a and the hot air motor 12b are operated as necessary. The driving of the hot air motor 12b is for phase control so that the number of rotations can be changed. A circuit is provided.

  The present embodiment is configured as described above. Next, the operation of the oven heating with preheating will be described in detail with reference to FIGS.

  The oven with preheating heats the heating chamber 28 until it reaches an input cooking temperature in an empty state, and then puts an object to be heated and cooks.

  The flow of the operation of the oven heating with preheating is roughly divided into preheating 1, preheating 2, and cooking steps as shown in the overall flow of FIG.

  In order to set cooking conditions for oven heating with preheating, oven heating with preheating is set with the heater heating setting key 6b of the operation unit 6, and the cooking temperature and cooking time are set with the setting dial 6d. For example, the cooking temperature is set to 200 ° C. and the cooking time is set to 20 minutes.

  When the setting is completed, the start key 6c is input while the heating chamber 28 is empty.

  When the start key 6c is input, the heating start of the process 7a is executed, the process proceeds to the process 7b of the preheating 1, and the heating of the heating chamber 28 is started.

  Step 7b of preheating 1 is a step of heating the heating chamber 28 until the set cooking temperature is reached. The heating chamber 28 is turned on by energizing the hot air heater 12a so as to reach the set cooking temperature. After the temperature of the chamber 28 rises and reaches the set cooking temperature, the preheating is completed when the power supply to the hot air heater 12a is first turned off.

  In detail, as shown in FIG. 9, after moving to step 7b of preheating 1, the control means 7 starts energizing the hot air motor 12b in step 7b-1, and the rotational speed of the hot air fan 32 is 40, which is the normal rotational speed. The power generated by the phase control is applied to the hot air motor 12b so as to be%.

  In the next step 7b-2, energization of electric power to the hot air heater 12a is controlled so that the temperature of the heating chamber 28 is heated to a set cooking temperature of 200 ° C.

  In the following description, Tp is the detection value input from the temperature detecting means 85 as described above, T1 is the temperature of the hot air fan 32 maintained at 40% of the normal number of rotations, and the hot air heater 12a controls the heating chamber 28. It is a control value which determines the electric power for heating temperature to the set cooking temperature of 200 degreeC.

  In the ON / OFF control for turning on / off the power supply to the hot air heater 12a, the temperature at which the power to the hot air heater 12a is turned on with respect to the control value T1 for heating to the cooking temperature of 200 ° C. And -1 and +1 are provided between the temperature to be turned off.

  While the temperature of the heating chamber 28 is lower than the set cooking temperature 200 ° C., the control means 7 satisfies the condition of the process 7b-2 (Tp <T1 + 1) and proceeds to the process 7b-3. Energization of power to the hot air heater 12a is turned on. When the temperature of the heating chamber 28 becomes higher than the set cooking temperature and the value of the detection value Tp does not satisfy the condition of step 7b-2 (Tp <T1 + 1), the process proceeds to step 7b-4 and the power to the hot air heater 12a is increased. Turn off the power.

  Since the temperature of the heating chamber 28 reaches the set cooking temperature, the power supply to the hot air heater 12a is turned off and the preheating is completed. In step 7b-5, notification of the completion of preheating is performed by a notification sound or the like. The process of preheating 1 is completed at 7b-6, and then the process proceeds to process 7c of preheating 2.

  The preheating 2 step 7c is a step of keeping the temperature of the heating chamber 28 from falling after the preheating is completed until the object to be heated is put into the heating chamber 28.

  Steps 7c-1, 7c-2, 7c-3, and 7c-4, which show details of step 7c, set the temperature of the heating chamber 28 when the hot air motor 12b is rotated at 40% of the normal rotation speed. This is a step of ON / OFF control of energization of the hot air heater 12a so that the cooking temperature of 200 ° C. can be maintained.

  After completion of preheating, the temperature of the heating chamber 28 rises several degrees due to overshoot and then turns down. During this time, since the temperature of the heating chamber 28 is higher than the set cooking temperature, the value of the detection value Tp does not satisfy the condition of step 7c-1 (Tp <T1 + 1), the process proceeds to step 7c-4, and the hot air heater 12a The state of turning off the power supply to the power continues.

  When the temperature of the heating chamber 28 starts to decrease after overshoot and the value of the detection value Tp becomes the same as the control value T1, the condition of the step 7c-1 (Tp <T1 + 1) and the condition of the step 7c-2 (Tp> In order to satisfy both T1-1), the energized state of power to the hot air heater 12a is not changed from the previous state of OFF, and the temperature of the heating chamber 28 is further lowered.

  As the temperature of the heating chamber 28 decreases, the detected value Tp satisfies the condition of step 7c-1 (Tp <T1 + 1), and the condition of step 7c-2 (Tp> T1-1) is not satisfied. Proceeding to 7c-3, power supply to the hot air heater 12a is turned ON.

  When the energization of the hot air heater 12a is turned on, the temperature of the heating chamber 28 starts to rise, and when the detection value Tp becomes the same as the control value T1, the condition of step 7c-1 (Tp <T1 + 1) and the condition of step 7c-2 In order to satisfy both (Tp> T1-1), the energization state of the electric power to the hot air heater 12a is not changed from the ON state of the previous state, and the heating chamber 28 is further heated, and the temperature of the heating chamber 28 rises. .

  Further, when the temperature of the heating chamber 28 rises and becomes higher than the set cooking temperature, and the detected value Tp does not satisfy the condition of step 7c-1 (Tp <T1 + 1), the process proceeds to step 7c-4 and the hot air heater The energization of power to 12a is turned off.

  By repeating the above operation according to the temperature of the heating chamber, the temperature of the heating chamber 28 is kept at the set cooking temperature.

  In step 7c-5, when the door 2 is not opened in the step of detecting the opening / closing of the door 2, the process proceeds to step 7c-6, the elapsed time of the preheating 2 is measured, and the elapsed time exceeds 10 minutes. Then, in order to save energy, the process proceeds to Step 7c-7, the power supply to the hot air heater 12a and the hot air motor 12b is turned off, and the heating is finished in Step 7c-8.

  When the door 2 is opened, the process proceeds to Step 7c-9, the power supply to the hot air heater 12a and the hot air motor 12b is turned off, and the preheating 2 process is completed in Step 7c-10, and the next process 7d is completed. Migrate to

  In step 7d, as shown in FIG. 12, the control means 7 places the square plate 50 on which the article 51 to be heated is placed on the shelf 27 of the heating chamber 28, closes the door 2, and inputs the start key 6c for starting heating. Wait until When the start key 6c is input, the process proceeds to step 7e.

  The cooking step 7e is a step of actually cooking the object to be heated 51 placed in the heating chamber 28.

  In FIG. 10 showing the details of step 7e, in step 7e-1, a hot air fan 32 is rotated by supplying a power source for rotating the hot air motor 12b to the normal rotation (100%).

  Steps 7e-2, 7e-3, 7e-4, and 7e-5 are performed with hot air so that the heating temperature of the heating chamber 28 can be maintained at the set cooking temperature of 200 ° C. when the hot air fan 32 rotates at normal rotation. This is a step of performing ON / OFF control of power supply to the heater 12a.

  The description of the process of controlling the ON / OFF of the energization of the hot air heater 12a is the same as the process of the preheating 2, and the description is omitted.

  However, the control value when the ON / OFF control of the energization of the hot air heater 12a is the same as setting the cooking temperature for heating the heating chamber 28 to 200 ° C., but the rotational speed of the hot air fan 32 is By changing from 40% of the normal rotation speed to 100% of the normal rotation, the amount of air circulated between the heating chamber 28 and the hot air unit 12 and the wind speed are changed, and the amount of hot air flowing into the heating chamber 28 and the air speed are changed. Is set to a control value T2 different from the control value T1 so as not to affect the control temperature of the heating chamber 28 with respect to the set cooking temperature.

  Therefore, the control value described above has a number corresponding to the difference in the number of rotations of the hot air fan 32 for each settable cooking temperature, and the set cooking temperature is changed even when the number of rotations of the hot air fan 32 is changed during heating. Without changing, the temperature of the heating chamber 28 is prevented from changing by changing to a control value corresponding to the rotational speed of the hot air fan 32.

  Step 7e-6 manages the elapsed cooking time, and when the set cooking time t (20 minutes) has elapsed, the next step 7e-7 turns off the power supply to the hot air heater 12a and hot air motor 12b. The cooking process is completed in 7e-8, and the heating is completed in process 7f.

  Since the configuration is the same as that of the first embodiment, a different configuration will be described with reference to FIG.

  The square plate 101 includes a leg 101a that is placed on the table plate 24, and the control unit 7 tares the weight of the table plate 24 and the square plate 101 from the value detected by the weight detection unit 25, thereby the object 51 to be heated. The weight can be detected.

  Next, the operation will be described by taking oven heating with preheating as an example.

  The setting is performed by setting the same preheating oven cooking conditions as in Example 1 (cooking temperature is 200 ° C., cooking time is 20 minutes).

  The flow of the heating operation is the same process as the general flow of FIG. 8 and is different from the cooking process 7e in that the weight of the object to be heated 51 is measured. A step of determining the control value according to the number of revolutions of the hot air fan 32 by setting the number of revolutions to be lower than the normal number of revolutions is shown, and this step is shown in the cooking step 7g of FIG.

  In the cooking step 7g, after the preheating 2 step is completed, as shown in FIG. 13, the leg 101a of the square plate 101 on which the object to be heated 51 is placed is placed on the table plate 24, the door 2 is closed, and heating is started. The process proceeds after the start key 6c is input.

  Then, when the flow of the flow proceeds to the cooking step 7g, the weight (M) of the heated object 51 is measured by the weight detection means 25 in step 7g-1 as shown in FIG. 14, and the weight (M) of the heated object 51 is measured. ) Is lighter than a constant weight (K) and satisfies the conditional expression (M ≦ K), the process proceeds to Step 7g-2, and the rotational speed N of the hot air fan 32 is determined to be 40% of the normal rotational speed, and the control value (Tn) is determined to be a control value T1 corresponding to the rotational speed of 40% of the hot air fan 32 in a state where the cooking temperature is 200 ° C.

  The reason why the rotational speed of the hot air fan 32 is set lower than the normal rotation when the weight of the heated object 51 is light is to prevent the heated object 51 from drying.

  On the other hand, if the weight (M) value of the heated object 51 measured in step 7g-1 is heavier than the constant weight (K) and satisfies the conditional expression (M> K), the process proceeds to step 7g-3, and the hot air fan 32 Is determined to be a normal rotation speed (100%), and a control value (Tn) is determined to be a control value T2 corresponding to the rotation speed of the hot air fan 32 at a cooking temperature of 200 ° C.

  When the weight of the heated object 51 is heavy, the rotation speed of the hot air fan 32 is rotated at a normal rotation because the heated object 51 has a large shape or the heated object 51 has a large number of heated objects. This is because hot air is circulated to every corner of 51 to prevent uneven heating.

  In step 7g-4, the hot air motor 12b is rotated based on the determined value.

  The next steps 7g-5, 7g-6, 7g-7, and 7g-8 are steps for ON / OFF control of energization of the hot air heater 12a. The control value Tn determined based on the weight determination result is changed to step 7g. The object to be heated 51 is heated while being input to the conditional expressions of -5 and 7g-6 and ON / OFF control of energization of the hot air heater 12a is performed.

  Step 7g-9 manages the elapsed time of cooking. When the set cooking time t (20 minutes) has elapsed, the process proceeds to step 7g-10 to turn off the power supply to the hot air heater 12a and the hot air motor 12b. In step 7g-11, the cooking step is finished, and in step 7f (FIG. 8), the heating is finished.

  In Example 2, the weight of the heated object 51 was measured and cooking was performed by determining the number of rotations of the hot air fan 32 according to the weight of the object to be heated 51, but the cook himself changed the number of rotations of the hot air fan 32. You may make it changeable. At that time, the control means 7 automatically determines a control value Tn when ON / OFF control of the energization of the hot air heater 12a is performed according to the set cooking temperature and the set hot air fan 32 rotation speed. Therefore, the temperature of the heating chamber 28 can always be maintained at the set cooking temperature without being affected by the rotational speed of the hot air fan 32.

  As described above, according to the present embodiment, by providing the control value for determining the supply of electric power to the hot air heater according to the cooking temperature and the rotational speed of the hot air fan, the state of the object to be heated and the heating Even if the number of rotations of the hot air fan is changed according to the process, the temperature of the heating chamber can always be kept at the set cooking temperature.

12 Hot Air Unit 12a Hot Air Heater 12b Hot Air Motor 25 Weight Detection Unit 51 Object to be Heated 72 Control Unit 85 Temperature Detection Unit

Claims (1)

The main body has a heating chamber for storing the object to be heated,
A hot air unit that circulates and heats the air in the heating chamber on the inner wall surface of the heating chamber;
The heating chamber is provided with temperature detecting means for detecting the temperature in the heating chamber,
In the substantially central part and upper and lower sides of the inner wall surface of the heating chamber, an intake hole and a blowout hole for circulating air between the heating chamber and the hot air unit are provided,
Forming an air passage communicating with the intake hole and the blowout hole between the inner wall surface of the heating chamber and a hot air case constituting an outline of the hot air unit;
The air passage is provided with a hot air fan that circulates the air at a position facing the intake hole, and a hot air heater that heats the air at a position facing the blowout hole,
On the front surface of the main body, an operation unit for setting a cooking temperature and a cooking time for heating the object to be heated is provided.
A detection value input from the temperature detection means is set by the operation unit so that the hot air fan is rotated in the main body to keep the temperature of the heating chamber at the cooking temperature set by the operation unit. In a heating cooker provided with control means for ON / OFF control of energization of power to the hot air heater in comparison with a control value for determining power to the hot air heater corresponding to the cooking temperature,
The cooking device according to claim 1, wherein the control means includes a control value corresponding to the number of rotations of the hot air fan for each cooking temperature.

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