JP2015140943A - heating cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent overheating of oil attached to an air outlet and a suction port when cooking ends, in the case where oven cooking is performed for feeding hot air generated by burning an oven burner in a combustion chamber into a heating chamber by a circulation fan, and for circulating it.SOLUTION: When a set cooking temperature is higher than a predetermined high temperature cooking temperature or an in-box temperature is higher than a predetermined high temperature in-box temperature, combustion of an oven burner 43 is prohibited before the set cooking time ends by predetermined time, and a cooling operation for rotationally driving only a circulation fan 6 is executed.

Description

  The present invention relates to a cooking device capable of cooking in an oven.

  2. Description of the Related Art Conventionally, in order to bake fish or the like, there is known a heating cooker that performs grill cooking by arranging a direct heating means such as a gas combustion type grill burner or an electric heater in a heating chamber that accommodates an object to be cooked. According to the heating cooker having this direct heating means, the food to be cooked can be cooked at a high temperature, so that the food to be cooked can be burnt firmly and is excellent in appearance when finished. Depending on the type and size, uneven baking is likely to occur, and protrusions such as a burner are disposed in the heating chamber, so that cleaning during cleaning is difficult.

  On the other hand, a heating chamber in which an object to be cooked is stored, a combustion chamber in which an oven burner is provided, and a circulation fan that takes in external air are provided, and combustion is performed by burning gas and air taken in by the circulation fan in the oven burner. There has also been proposed a cooking device that generates hot air of exhaust gas, sends the generated hot air to a heating chamber, and circulates the hot air into the heating chamber to cook the food to be cooked (Patent Document 1).

JP2013-213649A

  By the way, in a heating cooker that performs oven cooking as described above, the food to be cooked is less likely to be scorched as compared to grill cooking. It is necessary to increase the temperature of the room to 250 to 300 ° C. Therefore, in oven cooking, not only the air outlet that sends hot air to the heating chamber by the circulation of hot air and the suction port that sucks in hot air are heated to about 400 ° C, but also the amount of generated oil smoke is much larger than grill cooking. Oil easily adheres to the air outlet and suction port. Even if oil adheres to such air outlets and suction ports, if the circulating fan is constantly driven during cooking in the oven, the oil will not be heated to a high temperature by the circulating air, preventing the oil from burning. be able to.

  However, in oven cooking, cooking is generally performed by the user setting the cooking time and cooking temperature. When oven cooking is performed with such cooking time and cooking temperature set, the oven burner is extinguished at a predetermined upper and lower limit temperature during cooking time so that the temperature inside the heating chamber becomes the set cooking temperature. Then, the oven burner may be burning at the end of the set cooking time. For this reason, if the oven burner and the circulation fan are stopped simultaneously with the end of the cooking time, the circulating air is not circulated in the heating chamber and is blown by the high-temperature hot air remaining in the combustion chamber or the passage connecting the combustion chamber and the heating chamber. There is a problem that the oil adhering to the outlet and the suction port is overheated. Even after cooking is completed, the temperature in the heating chamber can be lowered by continuing the rotational drive of the circulation fan, but if the user takes out the food to be cooked within a short time after the cooking is completed, There is a problem that hot hot air leaks out.

  The present invention has been made to solve the above problems, and an object of the present invention is to perform oven cooking in which hot air generated by burning an oven burner in a combustion chamber is sent to a heating chamber by a circulation fan and circulated. Is to prevent overheating of the oil adhering to the air outlet and the suction port at the end of cooking.

The present invention
A heating chamber for heating the cooking object;
A combustion chamber containing an oven burner that generates hot air by burning gas and air taken from outside;
A circulation fan that takes in external air and circulates the hot air generated by the oven burner in the combustion chamber by sending it to the heating chamber;
A cooking time setting section for setting the cooking time;
A cooking temperature setting section for setting the cooking temperature;
An internal temperature detector for detecting the internal temperature of the heating chamber;
A cooking device comprising a controller for controlling combustion of the oven burner and rotation driving of the circulation fan so that cooking is performed at a set cooking time and a set cooking temperature,
The controller is
During the cooking time, the circulating fan is continuously driven to rotate,
When the cooking temperature is higher than a predetermined high temperature cooking temperature or the inside temperature is higher than a predetermined high temperature inside temperature, combustion of the oven burner is prohibited before cooking time is over and only the circulation fan is turned on. It is a heating cooker that performs a cooling operation to rotate.

  According to the cooking device, since the circulation fan is continuously driven to rotate during the set cooking time, it is possible to constantly circulate the circulating air in the heating chamber. Further, when the set cooking temperature is higher than the predetermined high temperature cooking temperature or the internal temperature is higher than the predetermined high temperature internal temperature, the oven burner is prohibited from burning before the set cooking time ends, Since the cooling operation in which only the circulation fan is rotated until the cooking time is completed, the hot air remaining in the combustion chamber and the like is discharged by the low-temperature air taken from the outside during the cooling operation until the cooking time is completed. It is possible to prevent the oil adhering to the air outlet and the suction port from being overheated. Moreover, since the temperature in the heating chamber is lowered by the cooling operation, it is possible to prevent high-temperature hot air from leaking even if the user takes out the food to be cooked within a short time after cooking.

In the heating cooker, preferably,
The said control part sets the said cooling driving | running longer, so that cooking temperature is high or internal temperature is high.

  According to the heating cooker, the higher the temperature during cooking, the longer the cooling operation in which combustion of the oven burner is prohibited earlier and only the circulation fan is rotated before the set cooking time ends. Further, overheating of the oil adhering to the air outlet and the suction port can be suppressed more reliably, and high temperature hot air can be prevented from leaking from the heating chamber when the door is opened.

In the heating cooker, preferably,
The controller continuously drives the circulation fan to rotate until the cooling operation is started, and extinguishes the oven burner at a predetermined upper and lower limit temperature so that the inside temperature becomes the cooking temperature.
After the cooling operation is started and the combustion of the oven burner is prohibited, even if the inside temperature falls below a predetermined lower limit temperature, the non-burning state of the oven burner is continued until the cooking time is finished, Only the circulation fan is driven to rotate.

  During oven cooking, when adjusting the temperature by turning off the oven burner based on the temperature inside the oven, if the circulation fan is continuously driven to rotate, the blower outlet and suction port can be blown by the circulating air even when the oven burner is burning. It is possible to prevent the oil adhering to the oil from overheating. In addition, if the oven burner is turned on based on the internal temperature to adjust the temperature in the heating chamber, and the oven burner burns when the set cooking time is over, hot air is However, according to the heating cooker, when the temperature during cooking is high and combustion of the oven burner is prohibited before the cooking time is over, the internal temperature becomes below a predetermined lower limit temperature. Since the oven burner is kept in the non-burning state and only the circulation fan is driven to rotate until the cooking time is over, the low-temperature air taken in from outside when cooking finishes overheating the oil adhering to the air outlet and suction port. It can be surely prevented.

In the heating cooker, preferably,
The controller performs a post-purge operation for continuing the rotational drive of the circulation fan for a predetermined post-purge operation time after the cooking time is completed.

  According to the heating cooker, when the temperature during cooking is high, the circulation fan continues to be driven even after the cooking time has ended, so that it is possible to more reliably prevent overheating of the oil adhering to the air outlet and the suction port.

In the heating cooker, preferably,
The controller rotates the circulation fan during the post-purge operation at a lower rotational speed than during the cooking time.

When the set cooking time is over, the user opens the door of the heating chamber and removes the food to be cooked.When the cooking fan is rotated at the same rotational speed as during the cooking time, There is a possibility that hot air in the room flows to the user side.
However, according to the heating cooker, the temperature in the heating chamber is lowered by the cooling operation performed before the end of the cooking time, and at a lower rotational speed than during the cooking time until the predetermined post-purge operation is completed. Since the circulation fan is driven to rotate, leakage of hot hot air from the heating chamber can be further suppressed.

  As described above, according to the heating cooker according to the present invention, the set cooking temperature is higher than the predetermined high temperature cooking temperature, or the internal temperature detected by the internal temperature detection unit is the predetermined high temperature internal temperature. If it is higher, the oven burner is prohibited from burning before the set cooking time is over, and a cooling operation is performed in which only the circulation fan is rotationally driven. It is possible to discharge hot hot air remaining in the air. Thereby, the temperature of the blower outlet and the suction port at the end of cooking can be lowered, the oil attached to the blower outlet and the suction port can be prevented from being overheated, and within a short time from the end of cooking. Leakage of high-temperature hot air when taking out the object to be cooked can be prevented. Further, as the temperature during cooking increases, the cooling operation in which only the circulation fan is rotationally driven before the cooking time ends is performed longer, so higher safety can be ensured.

  Furthermore, in the cooking device in which the oven burner is repeatedly extinguished during oven cooking, if the temperature during cooking is high, combustion of the oven burner is prohibited during the cooling operation before the cooking time ends. Since the oven burner is not ignited even when the internal temperature becomes lower than the lower limit temperature, it is possible to reliably prevent the oil adhering to the blowout port and the suction port from being overheated.

  In addition, by continuing the rotational drive of the circulation fan from the end of the set cooking time until the end of the predetermined post-purge operation time, even if hot air remains in the combustion chamber or the like, it is blown by the circulating air. It is possible to prevent the oil adhering to the outlet and the suction port from being overheated.

  And since the oven burner is reliably extinguished at the end of the cooking time, the oil attached to the air outlet and the suction port can be cooled even if the rotational speed of the circulation fan is rotated at a lower speed than during the cooking time. At the same time, leakage of hot air when the open / close door is opened can be suppressed.

It is a schematic exploded perspective view which shows an example of the state by which the heating cooker which concerns on embodiment of this invention is accommodated in the opening part of a system kitchen. It is a schematic cross-sectional perspective view which shows an example of the heating cooker which concerns on embodiment of this invention. It is a cross-sectional principal part perspective view which shows the back part of the heating cooker which concerns on embodiment of this invention. It is a block diagram in the heating cooker which concerns on embodiment of this invention. It is a flowchart which shows an example of control operation when performing oven cooking with the heating cooker which concerns on embodiment of this invention.

  FIG. 1 is a schematic exploded perspective view showing an example of a system kitchen in which the heating cooker of the present embodiment is accommodated, and FIG. 2 is a schematic sectional perspective view showing the vicinity of the heating chamber of the heating cooker. In FIG. 2, a stove main body such as a stove burner is omitted to avoid complication.

  The heating cooker according to the present embodiment is a built-in gas stove in which the stove body 100 is incorporated into the opening K1 of the countertop K of the system kitchen in a state of being dropped, and the stove body 100 and the upper open portion of the stove body 100 are provided. And a top plate 200 for covering.

  A main body case 120 that constitutes the outline of the stove main body 100 is configured by fixing a plurality of sheet metals formed in a predetermined shape by joining means such as screwing or caulking. In the stove main body 100, a gas stove unit 300 having two stove burners 310, 310 arranged side by side on the left and right, and a heating chamber in which a cooking object is stored below the gas stove unit 300 via a heat shield metal plate 400. (Oven box) 3a and a combustion chamber 3b are disposed further below the heating chamber 3a. Each stove burner 310 is disposed so as to protrude from the surface of the top plate 200 through a burner opening 210 provided in the top plate 200, and gas is supplied from a gas supply pipe (not shown). The stove cooker can be cooked on the stove burner 310. In addition, a liquid crystal display device 320 that displays the operating state, cooking temperature, and the like is disposed in front of the gas stove unit 300 so that the display panel can be visually recognized through the display window 230 provided on the top plate 200. It has become. Further, at the rear of the top plate 200, an exhaust port 220 is opened in which a duct opening 55 of the exhaust passage 5 described later and a discharge port 85 of the ventilation path 8 face. In the present specification, the direction in which the opening / closing door 32 side and the back side of the heating chamber 3a face each other is referred to as the front-rear direction, the width direction of the heating chamber 3a is referred to as the left-right direction, and the height direction of the heating chamber 3a.

  The heating chamber 3a is provided horizontally on the left side of the stove main body 100, and by opening and closing the open / close door 32, an object to be cooked can be taken in and out of the heating chamber 3a. Specifically, the plate 13 can be pulled out by rotating the open / close door 32 forward, and after opening an object to be cooked such as fish on the pulled out plate 13, the plate 13 can be opened and closed. The object to be cooked is accommodated in the heating chamber 3a by rotating the door 32 backward. Also, on the right side of the open / close door 32, switches such as a fire extinguisher switch for performing stove cooking and oven cooking, and an operation unit (not shown) that opens forward by pressing the lower part of the operation panel 110 are provided. Is provided.

  As shown in FIG. 2, the heating chamber 3 a has an upper wall 33, a lower wall 34, left and right side walls 35, and a rear (back side) rear wall 36 that constitute the ceiling, and the front surface is opened and closed. The door 32 is closed so as to be openable forward. In addition, a large number of exhaust holes 33a communicating with the duct opening 55 through the exhaust passage 5 formed above the upper wall 33 are formed in the rear central portion of the upper wall 33 of the heating chamber 3a.

  As shown in FIGS. 2 and 3, the rear wall 36 of the heating chamber 3a is formed with a large number of suction ports 31 for taking in the hot air in the heating chamber 3a at the center, respectively on the left and right sides thereof. A large number of air outlets 21 are formed. Further, at the center of the rear surface of the rear wall 36 excluding the region where the suction port 31 between the left and right outlets 21, 21 is formed, there are front and rear openings 38a, 38b, and an internal passage opened downward is provided. The hot air passage member 38 is attached. The lower part of the hot air passage member 38 communicates with a communication port 71a provided in an upper plate 71 of a combustion chamber 3b described later. Therefore, a hot air passage 44 that communicates with the communication port 71a of the lower combustion chamber 3b and supplies hot air generated in the combustion chamber 3b to the heating chamber 3a is formed between the front and rear walls of the hot air passage member 38.

  Behind the hot air passage member 38, there is an opening 60a that communicates with the rear opening 38b, surrounds the hot air passage 44, and communicates with the left and right outlets 21 formed in the rear wall 36 of the heating chamber 3a. A circulation fan case 60 having a U-shaped internal passage is attached. The rear surface of the circulation fan case 60 is closed except for the insertion portion through which the rotation shaft of the motor 4 is inserted. Thereby, while being connected with the hot air channel | path 44 via the opening part 60a, the channel | path 61 for circulation connected with the blower outlet 21 attached to the right-and-left both sides of the rear wall 36 of the heating chamber 3a is formed. A circulation fan 6 is provided in the circulation passage 61 for taking outside air and forcibly circulating hot air into the heating chamber 3a.

  The combustion chamber 3b includes an upper plate 71 that constitutes a ceiling wall of the combustion chamber 3b, a bottom plate 72 that is disposed opposite to the lower side of the upper plate 71, left and right side plates, and a rear plate 73, and is open to the front. It is formed in a rectangular box shape. A communication port 71a that communicates with the hot air passage 44 that is surrounded by the front and rear walls of the hot air passage member 38 described above is provided behind the upper plate 71 of the combustion chamber 3b. Further, the cooking device has an air intake port communicating with the outside on the lower front surface or the like of the stove body 100, and is configured such that when the circulation fan 6 is rotated, air is taken into the combustion chamber 3b from the outside. Has been. Further, an oven burner 43 to which gas is supplied via a gas supply pipe (not shown) is disposed behind the combustion chamber 3b. Therefore, the air taken in as combustion air and the gas are mixed and burned by the oven burner 43, whereby hot air of combustion exhaust gas is generated in the combustion chamber 3b, and the generated hot air communicates from below. It is fed into the hot air passage 44 through the port 71a.

  The circulation fan 6 of the present embodiment is a suction-type circulation fan that is disposed downstream of the oven burner 43 in the hot air flow path. The circulation fan 6 is fixed to the tip of the rotating shaft of the motor 4 located at the rear, and corresponds to the formation area of the suction port 31, the front and rear openings 38a and 38b, and the opening 60a in the center of the rear wall 36. In place. Therefore, when the motor 4 is energized to rotate the circulation fan 6, hot air in the heating chamber 3 a is sucked into the circulation passage 61 through the suction port 31 formed in the rear wall 36 and the lower combustion chamber. The hot air generated in 3b passes through the hot air passage 44 and is sucked into the circulation passage 61 from the opening 60a. And the sucked hot air is sent out into the heating chamber 3a from the blower outlets 21 located on the left and right sides of the rear wall 36. As a result, hot air is forcibly circulated in the heating chamber 3a, the temperature in the heating chamber 3a is rapidly increased, and the temperature can be made uniform efficiently. Fish or meat contained in the heating chamber 3a Etc. can be cooked in an oven.

  A motor chamber 40 in which the motor 4 is accommodated is provided behind the circulation fan case 60 constituting the circulation passage 61. The motor chamber 40 includes a cylindrical motor case 42 having an opening in the front-rear direction, and the front of the motor case 42 communicates with the opening 41a of the cooling fan case 41 disposed adjacent to the motor case 42. Is communicated with an air introduction hole 150 provided in the main body case 120 and exposed to the outside so that air is taken in from the outside.

  The cooling fan case 41 is disposed between the circulation fan case 60 and the motor case 42, and in the cooling fan case 41, the cooling fan 7 fixed to the middle portion in the axial direction of the rotating shaft of the motor 4 is provided. Contained. The opening 41a through which the rotation shaft of the motor 4 is inserted is formed larger than the diameter of the rotation shaft of the motor 4 so that the motor chamber 40 and the cooling fan case 41 communicate with each other. In addition, the bottom surface of the cooling fan case 41 and the front end portions of both side surfaces are joined and closed to the rear surface of the circulation fan case 60. Further, although not shown, the cooling fan case 41 is formed to be larger than the diameter of the cooling fan 7 so as to protrude to the right side when viewed from the front, and the protruding side upper part is the air taken in by the cooling fan 7. Is opened upward to discharge the water to the outside. As shown in FIG. 2, the upper part of the cooling fan case 41 extends rearward beyond the upper side of the motor chamber 40, and is bent and extends upward toward the discharge port 85. It is connected. Thus, when the cooling fan 7 is driven to rotate, the air introduction hole 150 formed in the main body case 120 at the upstream end communicates with the discharge port 85 at the downstream end, and the taken-in air is discharged from the discharge port 85 to the outside. A ventilation path 8 is formed.

  In the present embodiment, the ventilation path 8 communicates with the motor chamber 40 via the opening 41 a of the cooling fan case 41, but is not in communication with the circulation path 61 by the circulation fan case 60. The compartments are separated so that the taken-in air is not sent into the hot air passage 44. Thereby, the temperature drop of the hot air by the air taken in by the cooling fan 7 is prevented.

  As described above, the exhaust passage 5 communicating with the exhaust hole 33a is formed behind the upper wall 33 constituting the ceiling portion of the heating chamber 3a. The exhaust passage 5 is opposed to the upper wall 33 at a predetermined interval and spaced apart, and further extends to the rear in the horizontal direction, and further extends in the horizontal direction from the upper surface of the circulation fan case 60 to the rear, and is bent and ducted. The partition plate 52 extends upward toward the opening 55. The upper end of the partition plate 52 forms a downstream end of the exhaust passage 5 and a downstream end of the ventilation path 8. Further, the duct opening 55 of the exhaust passage 5 and the discharge port 85 of the ventilation passage 8 communicate with the exhaust port 220 formed in the top plate 200. As a result, the ventilation path 8 is arranged behind the stove body 100 in a state of being separated and separated from the exhaust passage 5 by the partition plate 52, and the exhaust from the exhaust passage 5 and the air from the ventilation path 8 are The air is discharged from the single exhaust port 220 to the outside.

  In the exhaust passage 5, an internal temperature thermistor (internal temperature detector) 90 for detecting the internal temperature is disposed. A detection signal detected by the internal temperature thermistor 90 is output to a control unit C described later. The inside temperature thermistor 90 may be provided in the heating chamber 3a.

  FIG. 4 is a block diagram of the heating cooker according to the present embodiment. Note that the control unit C controls the combustion of the stove burner 310 and the oven burner 43 and the rotational drive of the circulation fan 6, but the explanation of the stove burner 310 is omitted.

  A branch pipe L <b> 1 branched from the gas supply pipe L is connected to the oven burner 43, and a main valve 403 that is opened and closed by pressing of the fire extinguishing switch 70 is disposed in the gas supply pipe L. The branch pipe L1 is provided with a safety valve 404 that is an electromagnetic valve that is opened when the ignition of the oven burner 43 is started, and a flow rate adjustment valve 405 that is an electromagnetic valve that adjusts the amount of gas supplied to the oven burner 43. It is installed. The opening degree of the safety valve 404 and the flow rate adjustment valve 405 is adjusted according to a signal from the control unit C. Further, an ignition electrode 401 and a thermocouple 402 are disposed near the flame hole of the oven burner 43. The ignition electrode 401 is subjected to a spark discharge when a high voltage is applied from the igniter 410. Further, the thermoelectromotive force generated when the thermocouple 402 is heated by the combustion flame is output to the control unit C. Further, the motor 4 is connected to the control unit C, and the rotational speed of the circulation fan 6 is changed by changing the energization amount to the motor 4. The control unit C is connected to the above-described internal temperature thermistor 90, and the control unit C performs combustion of the oven burner 43 during the oven cooking based on the detection signal from the internal temperature thermistor 90. Control.

  An operation unit 700 of the heating cooker includes a cooking start switch 701 for starting oven cooking, a cooking menu switch 702 for selecting a type of an object to be cooked such as fish dishes, a cooking time setting switch 703 for setting cooking time, and a cooking temperature. A cooking temperature setting switch 704 to be set is provided.

  The control unit C is an electronic unit including a CPU, a ROM, a RAM, and the like, and operates with power supplied from the power supply circuit 900. And the control unit C performs oven cooking with respect to a to-be-cooked object according to operation of the operation unit 700 by a user. Although not shown, the control unit C performs motor cooking according to the operation of the operation unit 700, so that a motor drive circuit, a switch circuit, an igniter circuit, a solenoid valve drive circuit, a thermocouple circuit, a thermistor circuit, a timer It has a circuit. Further, when the cooking temperature set by the cooking temperature setting switch 704 is higher than a predetermined high temperature cooking temperature, the control unit C extinguishes the oven burner 43 before the cooking time set by the cooking time setting switch 703 ends. Then, when the cooling operation time corresponding to the cooking temperature for rotating only the circulation fan 6 or the set cooking temperature is higher than the predetermined high temperature cooking temperature, the rotation of the circulation fan 6 is finished after the set cooking time is finished. A memory is provided for storing a data table in which the post-purge operation time during which the drive is continued, the rotational speed of the circulation fan 6 and the energization amount to the motor 4 are set.

  Next, an example of the control operation in the case of performing oven cooking using the heating cooker of the present embodiment will be described based on the flowchart shown in FIG.

  In order for the user to perform oven cooking, the door 32 is rotated forward to place an object to be cooked such as fish or meat on the plate 13 taken out from the heating chamber 3a, and the door 32 is rotated backward. When the point-extinguishing switch 70 is pressed after the front opening of the heating chamber 3a is closed (step ST1), power is supplied from the power supply circuit 900 and the control unit C starts operating, and the main valve 403 opens. For example, the user selects a fish dish with the cooking menu switch 702 of the operation unit 700, sets the cooking time ta with the cooking time setting switch 703, and further sets the cooking temperature Ta with the cooking temperature setting switch 704. When the cooking start switch 701 is turned on (steps ST2 to ST4), an on signal is input to the control unit C, and the control unit C starts a timer (step ST5). Next, if the cooking temperature Ta is higher than a predetermined high temperature cooking temperature Th (for example, 250 ° C.) (Yes in step ST6), the cooling operation time tc (for example, 20 seconds) corresponding to the cooking temperature Ta from the data table, and Post purge operation time tp (for example, 60 seconds) is set (step ST7).

  When oven cooking is started, energization to the motor 4 is started, and the circulation fan 6 and the cooling fan 7 are rotated at a predetermined initial rotation speed (for example, the maximum rotation speed) (steps ST8 to ST9). Thereby, external air is taken into the combustion chamber 3b.

  When the circulation fan 6 is driven to rotate at a predetermined rotational speed, the safety valve 404 is opened, the flow rate adjustment valve 405 is opened at the maximum heating power, and a high voltage is applied from the igniter 410 to the ignition electrode 401. The oven burner 43 is ignited (step ST10). As a result, combustion air and gas are combusted in the oven burner 43 of the combustion chamber 3b, and hot air of the combustion exhaust gas passes through the hot air passage 44 and is sent into the heating chamber 3a, and hot air blown into the heating chamber 3a. Is circulated.

  When the ignition of the oven burner 43 is completed, the control unit C performs a temperature control operation for extinguishing the oven burner 43 based on the internal temperature Tx detected by the internal temperature thermistor 90 (steps ST11 to ST14). In this temperature control operation, when the internal temperature Tx becomes a predetermined upper limit temperature Ta + ΔT ° C. (for example, set cooking temperature + 4 ° C.) or more than the cooking temperature Ta set by the cooking temperature setting switch 704, The safety valve 404 for supplying the gas is closed and extinguished, and only the rotational drive of the circulation fan 6 is continued. In addition, when the internal temperature Tx falls below a predetermined lower limit temperature Ta−ΔT ° C. (for example, the set cooking temperature −4 ° C.) below the set cooking temperature Ta, the safety valve 404 that supplies gas to the oven burner 43 is opened again. Then, a high voltage is applied from the igniter 410 to the ignition electrode 401, and the oven burner 43 is re-ignited.

  When cooking temperature Ta set by cooking temperature setting switch 704 is equal to or lower than a predetermined high temperature cooking temperature Th (No in step ST6), and cooling operation time tc and post-purge operation time tp are not set (step ST15). No), the control unit C performs the above temperature control operation until the cooking time ta ends, and when the cooking time ta ends, the main valve 403 and the safety valve 404 are closed, and the oven burner 43 is opened. While extinguishing the fire, the energization to the motor 4 is stopped, the circulation fan 6 is stopped, and the end of cooking is notified from the liquid crystal display device 320 or the like (steps ST17 to ST18). When the set cooking temperature Ta is low, since hot hot air does not remain in the combustion chamber 3b, the hot air passage 44, and the circulation passage 61, the circulation fan 6 can be stopped simultaneously with the end of the cooking time. The oil adhering to the air outlet 21 and the air inlet 31 is not overheated.

On the other hand, when the cooking temperature Ta set by the cooking temperature setting switch 704 is higher than the predetermined high temperature cooking temperature Th (Yes in step ST6), the cooling operation time tc and the post purge operation time tp are set (step ST15). In step ST19, it is determined whether the cooking time tx is before the set cooling operation time tc from the set cooking time ta. When the cooling operation time tc elapses from the end of the cooking time ta, the main valve 403 and the safety valve 404 are closed, the oven burner 43 is extinguished and combustion is prohibited, and only the rotational drive of the circulation fan 6 is continued. (Step ST20).
Thereby, even if the set cooking temperature Ta is high and high-temperature hot air remains in the combustion chamber 3b, the hot air passage 44, and the circulation passage 61, the cooling operation time tc until the cooking time ta ends is reached. Since hot air is discharged by the low-temperature air taken in from the outside, it is possible to prevent the oil adhering to the air outlet 21 and the suction port 31 from being overheated. Moreover, in this cooking device, since the cooling operation time tc is set to be longer as the cooking temperature Ta is higher, even if high-temperature hot air remains, it adheres to the air outlet 21 and the air inlet 31. The oil temperature can be reliably lowered. Further, during the cooling operation time tc, the oven burner 43 is kept in the non-burning state, and even if the inside temperature is lowered, the oven burner 43 is not re-ignited. It does not remain. Moreover, since the internal temperature in the heating chamber 3a is lowered by the cooling operation, even if the user opens the door 32 and takes out the food to be cooked within a short time after cooking, the cooking chamber 3a is taken out of the heating chamber 3a. It is also possible to prevent high temperature hot air from leaking out.

  Next, when the set cooking time ta ends (Yes in step ST21), the circulation fan 6 is lowered to a low rotational speed (for example, about 1/2 of the rotational speed during cooking), and the liquid crystal display device 320 or the like is used. The end of cooking is notified (step ST22). Further, the rotation drive of the circulation fan 6 is continued until a predetermined post purge operation time tp elapses, and when the post purge operation time tp elapses, the circulation fan 6 is stopped (steps ST23 to ST24). Thereby, the temperature of the blower outlet 21 or the suction inlet 31 can be reduced further. Further, during this post-purge operation time tp, since the circulation fan 6 is driven to rotate at a low rotational speed, the heating chamber 3a is opened when the user opens the open / close door 32 in order to take out the food to be cooked from the heating chamber 3a. Leakage of hot air from the inside can be further suppressed.

(Other embodiments)
(1) In the above embodiment, when the cooking temperature set by the cooking temperature setting switch 704 is higher than a predetermined high temperature cooking temperature, combustion of the oven burner 43 is prohibited before the cooking time is over, and only the circulation fan 6 is used. The cooling operation for rotationally driving and the post-purge operation for rotationally driving the circulation fan 6 after completion of the cooking time are performed, but the internal temperature detected by the internal temperature thermistor 90 during the oven cooking is a predetermined high internal temperature. Similarly, when it becomes higher, a cooling operation before the end of the cooking time and a post-purge operation after the end of the cooking time may be performed.
(2) In the above embodiment, after the cooking time is over, the rotational speed of the circulation fan 6 during the post-purge operation is lower than during cooking. The circulation fan 6 may be rotated at the same rotation speed, and the rotation speed of the circulation fan 6 may be reduced when the opening / closing door 32 is opened. Moreover, you may reduce the rotation speed of the circulation fan 6 also when the opening / closing door 32 is opened during cooking.
(3) In the above embodiment, when oven cooking is started, the cooking time is continuously counted, but during cooking, the user opens the door 32 to check the food to be cooked, When cooking is interrupted by accidentally turning off the power or the like, the interruption time may be subtracted from the count time.

3a Heating chamber 3b Combustion chamber 6 Circulating fan 703 Cooking time setting switch (Cooking time setting section)
704 Cooking temperature setting switch (cooking temperature setting section)
43 Oven burner 90 Internal temperature thermistor (Internal temperature detector)
C Control unit (control unit)

Claims (5)

A heating chamber for heating the cooking object;
A combustion chamber containing an oven burner that generates hot air by burning gas and air taken from outside;
A circulation fan that takes in external air and circulates the hot air generated by the oven burner in the combustion chamber by sending it to the heating chamber;
A cooking time setting section for setting the cooking time;
A cooking temperature setting section for setting the cooking temperature;
An internal temperature detector for detecting the internal temperature of the heating chamber;
A cooking device comprising a controller for controlling combustion of the oven burner and rotation driving of the circulation fan so that cooking is performed at a set cooking time and a set cooking temperature,
The controller is
During the cooking time, the circulating fan is continuously driven to rotate,
When the cooking temperature is higher than a predetermined high temperature cooking temperature or the inside temperature is higher than a predetermined high temperature inside temperature, combustion of the oven burner is prohibited before cooking time is over and only the circulation fan is turned on. A cooking device that performs a cooling operation to rotate. The heating cooker according to claim 1, wherein
The said control part is a heating cooker which sets the said cooling driving | operation long, so that cooking temperature is high or the temperature in a store | warehouse | chamber is high. The heating cooker according to claim 1 or 2,
The controller continuously drives the circulation fan to rotate until the cooling operation is started, and extinguishes the oven burner at a predetermined upper and lower limit temperature so that the inside temperature becomes the cooking temperature.
After the cooling operation is started and combustion of the oven burner is prohibited, even if the internal temperature falls below a predetermined lower limit temperature, the non-burning state of the oven burner is continued until the cooking time ends, and the circulation A cooking device that drives only the fan to rotate. In the heating cooker according to any one of claims 1 to 3,
The said control part is a heating cooker which performs the post purge operation which continues the rotational drive of the said circulation fan after predetermined cooking time after completion | finish of cooking time. The cooking device according to claim 4, wherein
The controller is a heating cooker that rotationally drives the circulation fan at a lower rotational speed during post purge operation than during cooking time.

Images