JP5688060B2 - Cooker - Google Patents

Description

  The present invention relates to a cooking device. In particular, the present invention relates to a heating cooker in which oven cooking is performed by circulating hot air in a heating chamber.

  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 cooking device having the 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 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 cooker has also been proposed in which heating means for generating hot air is provided in a separate chamber from the heating chamber, and the generated hot air is supplied to the heating chamber and circulated to perform oven cooking (for example, Patent Document 1). .

  This type of heating cooker is, for example, a combustion chamber that generates gas of combustion exhaust gas by burning gas by a heating means such as an oven burner, a heating chamber that communicates with the combustion chamber and accommodates an object to be cooked, A circulation fan is provided, and while the hot air generated in the combustion chamber is fed into the heating chamber, the food to be cooked is indirectly cooked by circulating the hot air into the heating chamber. For this reason, compared with the case where a direct heating means such as a grill burner is provided in the heating chamber, uneven baking is less likely to occur in the cooking object, and it is possible to bake evenly into the cooking object. Further, by circulating hot air, heat can be quickly distributed throughout the heating chamber, so that cooking in a short time becomes possible. Furthermore, since no protrusion such as a grill burner is provided in the heating chamber, the heating chamber can be easily maintained.

JP 2000-249343 A

  By the way, in a heating cooker that performs oven cooking, it is difficult to burn the food to be cooked compared to grill cooking, so it is necessary to circulate high temperature hot air in the heating chamber to burn the food to be cooked. The amount generated is much greater than grill cooking. Even if such a large amount of oily smoke is generated in the heating chamber, if the oven burner is burned, high-temperature hot air is supplied from the combustion chamber, so that most of the oily smoke is heated and burned off by contact with the hot air. Can do. However, in the cooking device that cooks the oven while extinguishing the temperature of the oven burner and adjusting the temperature, high-temperature hot air is not supplied while the oven burner is extinguished. Will be discharged. As a result, there is a problem that a large amount of oily smoke is discharged into the room.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to prepare an object to be cooked during oven cooking in which an object is cooked by circulating hot air generated in an oven burner into a heating chamber. It is providing the cooking device which can reduce discharge | emission to the exterior of the large amount of oil smoke which generate | occur | produces from.

The present invention comprises an oven burner that generates hot air by burning gas,
A heating chamber for heating the cooking object;
A circulation fan for circulating hot air generated in the oven burner to the heating chamber;
A motor that rotationally drives the circulation fan;
An exhaust passage that communicates with the heating chamber and exhausts exhaust gas containing oil smoke generated from an object to be cooked in the heating chamber from an exhaust port;
An after burner that is disposed in the exhaust passage and burns gas to heat and burn off the oil smoke in the exhaust gas passing through the exhaust passage;
A control unit for controlling the combustion of the oven burner and the after burner, and the rotational drive of the circulation fan,
The control unit ignites the afterburner during oven cooking, and extinguishes the oven burner for temperature adjustment in the heating chamber,
When extinguishing the oven burner, the reducing the rotational speed of the circulating fans or said circulation fan is stopped, the heating chamber is reduced circulating air volume of hot air that circulates Rutotomoni, increase the gas combustion amount of the afterburner It is a heating cooker.

  By providing a circulation fan, hot air generated in the oven burner can be forcibly circulated in the heating chamber, so that oven cooking can be performed efficiently, while oil smoke that has not been degassed is removed from the heating chamber to the outside. It is easy to be discharged. However, since the cooking device has an afterburner in the exhaust passage, oil smoke in the exhaust gas flowing from the heating chamber to the exhaust passage can be heated and burned off by the afterburner.

  Also, if the oven burner is extinguished to adjust the temperature during oven cooking, high-temperature hot air will not be supplied, and it will be difficult for smoke to be removed, so the circulating fan will rotate at the same speed as when the oven burner was ignited. If left alone, exhaust gas containing a large amount of oily smoke will be discharged to the outside. However, according to the heating cooker, when the oven burner is extinguished during oven cooking to adjust the temperature in the heating chamber, the rotation speed of the circulation fan is reduced or the circulation fan is stopped to circulate hot air in the heating chamber. Since the amount of air is reduced, the amount of exhaust discharged from the heating chamber to the exhaust passage can be reduced, and the exhaust speed flowing through the exhaust passage can be reduced, so that the afterburner can reliably burn and burn the oil smoke.

In the heating cooker, preferably,
When the oven burner is re-ignited to adjust the temperature in the heating chamber during oven cooking, the control unit increases the number of rotations of the circulation fan more than when the oven burner is extinguished, so that the heating chamber Increase the circulating air volume of the hot air circulating through.

  According to the heating cooker, when the oven burner is reignited for temperature adjustment, the circulating air volume of hot air is increased more than when the oven burner is extinguished. Oil smoke can be heated and burned off by the hot air supplied.

In the heating cooker, preferably,
The control unit reduces the amount of gas burned in the afterburner when the oven burner is re-ignited for temperature adjustment in the heating chamber during oven cooking, compared to when the oven burner is extinguished.

  According to the above-mentioned cooking device, when the oven burner is re-ignited for temperature adjustment, it is possible to heat and burn off the smoke with high-temperature hot air by increasing the circulating air volume. The amount of gas combustion can be reduced.

In the heating cooker, preferably,
The control unit extinguishes the oven burner when a predetermined heating time of the oven cooking is up,
After extinguishing the oven burner, a predetermined post-purge time, rotation driving of the circulation fan and combustion of the after burner are continued.

  In oven cooking, there is a possibility that a large amount of oily smoke remains in the heating chamber when the predetermined heating time is up, and there is a risk that oily smoke will be discharged from the heating chamber if the door is opened immediately after heating is completed. . However, according to the heating cooker, even if the predetermined heating time is up and the oven burner is extinguished, the circulating fan is driven to rotate and the afterburner is burned for a predetermined post-purge time. The oil smoke remaining in the exhaust gas is sent to the exhaust passage, and the after-burner can burn and burn the oil smoke. Thereby, the oil smoke in a heating chamber can be reduced and oven cooking can be complete | finished.

In the heating cooker, preferably,
The heating chamber has a blow-out port and a suction port for circulating hot air on the rear wall of the constituent wall of the heating chamber, and an exhaust outlet communicating with the exhaust passage on the upper wall,
The exhaust outlet is provided above the outlet.

  According to the heating cooker, since the outlet for blowing hot air is provided on the rear wall of the heating chamber, and the exhaust outlet connected to the exhaust passage is provided on the upper wall above the outlet, the heating chamber It becomes difficult for the hot air circulating through the exhaust to flow to the exhaust outlet. Therefore, it becomes easy for oil smoke from the cooking object to be sucked into the suction port, so that it becomes difficult to be discharged directly from the exhaust outlet, and it is easy to be smoked by high-temperature hot air, thereby reducing the absolute amount of oil smoke. Can do.

In the heating cooker, preferably,
The heating chamber has an exhaust outlet communicating with the exhaust passage on an upper wall of a constituent wall of the heating chamber, and has an obstacle wall in the vicinity of the exhaust outlet that prevents the flow of exhaust to the exhaust outlet.

  According to the heating cooker, since it becomes difficult for the exhaust gas to flow to the exhaust outlet, the oil smoke can be further smoked.

  As described above, according to the present invention, by providing the circulation fan, the hot air generated in the oven burner can be forcedly circulated in the heating chamber, so that oven cooking can be performed efficiently. In addition, since an afterburner that heats and burns oil smoke is provided in the exhaust passage, even if oil smoke is generated from an object to be cooked such as fish or meat during cooking in the oven, the afterburner is used when exhaust passes through the exhaust passage. Oil smoke can be burned off by heating. In addition, during oven cooking, if the oven burner is extinguished to adjust the temperature in the heating chamber, a large amount of oily smoke is generated in the heating chamber. However, the number of rotations of the circulation fan is reduced or the circulation fan is stopped, Since the amount of exhaust air flowing into the exhaust passage is reduced, the exhaust speed is reduced, and even when the oven burner is extinguished, oil smoke can be reliably heated and burned by the after burner. . Thereby, discharge | emission to the room | chamber interior of the oil smoke during oven cooking can be reduced.

It is a schematic cross-sectional perspective view which shows an example of the heating cooker which concerns on Embodiment 1 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 1 of this invention. It is a block diagram in the heating cooker which concerns on Embodiment 1 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 1 of this invention. It is the front view which looked at the heating chamber of the state which removed the door with the heating cooker which concerns on Embodiment 2 of this invention from the front downward direction. It is the heating cooker which concerns on Embodiment 3 of this invention, and is the front view which looked at the heating chamber of the state which removed the door from the front downward direction. It is a general | schematic cross-section principal part perspective view which shows the heating cooker which concerns on Embodiment 3 of this invention.

(Embodiment 1)
FIG. 1 is a schematic cross-sectional perspective view of a heating cooker according to the present embodiment. This cooking device is a built-in gas stove in which a stove body 11 is incorporated in a state of being dropped into an opening of a countertop 10 of a system kitchen. The oven incorporated in the gas stove is positioned below the countertop 10 and has a heating chamber 3a (oven box) for storing the food to be cooked and a combustion chamber 3b provided below the heating chamber 3a. In this specification, the direction in which the 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 is referred to as the up-down direction.

  The heating chamber 3a is horizontally long on the left side of the stove main body 11, and by opening and closing the door 32 of the front panel, an object to be cooked can be taken in and out of the heating chamber 3a.

  Specifically, when the door 32 is rotated forward, the plate 13 can be pulled out, and after placing an object to be cooked such as fish on the pulled out plate 13, the door 32. To be cooked is accommodated in the heating chamber 3a. In addition, the front panel of the door 32 is provided with a point fire switch 70 for performing oven cooking and an operation unit (not shown) that opens forward by pressing the front panel. Has a cooking menu switch for selecting fish dishes or fried food dishes.

  The heating chamber 3a has an upper wall 33 that constitutes a ceiling portion, a lower wall 34 that partitions the lower combustion chamber 3b, left and right side walls 35, and a rear (back side) rear wall 36. The door 32 is closed so as to be openable forward. In addition, a large number of exhaust outlets 33 a communicating with the exhaust port 50 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 3 a.

  As shown in FIGS. 1 and 2, 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 in the center, and a large number of suction ports 31 on both the left and right sides. An air outlet 21 is formed. Further, a heat shield plate 38 (see FIG. 2) is attached to the rear surface of the rear wall 36 excluding the region where the suction port 31 between the left and right outlets 21 is formed, being separated from the rear wall 36. Yes. A hot air passage 44 for supplying hot air of the combustion exhaust gas generated in the combustion chamber 3b to the heating chamber 3a is formed behind the heat shield plate 38.

  The combustion chamber 3b includes a lower wall 34 that constitutes a ceiling wall of the combustion chamber 3b, a bottom surface opposed to the lower wall 34, left and right side surfaces, and a heat shield plate attached to the rear surface of the rear wall 36. 38 and a hot-air passage forming member 45 having a rear wall facing surface 45b (see FIG. 2) disposed opposite to the rear wall 38, and behind the combustion chamber 3b via a gas supply pipe (not shown). An oven burner 43 to which gas is supplied is provided. 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 11, 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. Therefore, the external 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.

  Further behind the position where the oven burner 43 is disposed, the hot air passage 44 communicates with the hot air passage 44 surrounded by the heat shield plate 38 and the hot air passage forming member 45, and hot air generated in the combustion chamber 3 b enters the hot air passage 44. It is sent.

  The hot air passage forming member 45 is in close contact with the heat shield plate 38 in such a manner as to surround the upper and left sides of the suction port 31 from the rear wall facing surface 45b located behind the heat shield plate 38, and the lower part thereof is in the combustion chamber 3b. It is open. Furthermore, an opening 45a for sucking hot air through the hot air passage 44 by the circulation fan 6 described later is formed at a position facing the suction port 31 of the rear wall facing surface 45b.

  As shown in FIGS. 1 and 2, a circulation fan case 60 is disposed at the rear of the rear wall facing surface 45b of the hot air passage forming member 45 so as to surround the hot air passage 44 formed at the rear of the heating chamber 3a. Has been. The circulation fan case 60 is closed at the rear surface except for the insertion portion through which the rotation shaft of the motor 4 is inserted, and the front end portion of the upper surface, the bottom surface, and both side surfaces are joined to the peripheral edge of the rear wall 36 and closed. Has been. As a result, a circulation passage 61 is formed which communicates with the hot air passage 44 through the opening 45a and communicates with the outlets 21 attached to the left and right sides of the rear wall 36 of the heating chamber 3a. A circulation fan 6 for forcibly circulating hot air in the heating chamber 3a is disposed in the circulation passage 61.

  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. This 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 at the center of the rear wall 36 and the opening 45a of the rear wall facing surface 45b. Is installed. 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 45a. 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, and as shown in FIG. A supply cylinder 42 that is open to the outside is connected, and external air for cooling can be taken in via the supply cylinder 42.

  A cooling fan 7 is disposed between the circulation fan case 60 and the motor 4. The cooling fan 7 is fixed to an intermediate portion in the axial direction of the rotating shaft of the motor 4. Between the cooling fan 7 and the motor 4, A cooling fan case 41 having a rear surface having an opening 41a in the center for cooling the motor 4 by the rotation of the cooling fan 7 is disposed. Further, the bottom surface and both side surfaces of the cooling fan case 41 are joined and closed with the circulation fan case 60, but the upper portion of the cooling fan case 41 is opened upward to discharge the cooling air to the outside. . The rear of the upper opening portion extends beyond the motor chamber 40 and is connected to a passage member 81 that opens toward the exhaust port 50. As a result, a motor chamber 40 in which the motor 4 is accommodated at the upstream end and a cooling passage 8 that communicates with the exhaust port 50 at the downstream end and discharges the cooling air after cooling the motor 4 from the exhaust port 50 to the outside are formed. Is done.

  The cooling passage 8 communicates with the motor chamber 40 via the opening 41 a of the cooling fan case 41, but is separated from the circulation passage 61 by the circulation fan case 60 so as to be disconnected. The cooling air is configured not to be sent into the hot air passage 44. Thereby, the temperature fall of the hot air by cooling air is prevented.

  As described above, the exhaust passage 5 communicating with the exhaust outlet 33a and the exhaust port 50 is formed at the upper rear of the upper wall 33 constituting the ceiling portion of the heating chamber 3a. The exhaust passage 5 is opposed to the rear upper wall 33 at a predetermined interval and spaced apart, and is further connected to the exhaust cover 51 extending horizontally rearward and the upper peripheral edge of the rear wall 36 of the heating chamber 3a. A horizontal portion 53 that extends horizontally from the upper surface of 60 to above the cooling passage 8 in the rearward direction and a standing portion 54 that extends obliquely upward from the rear end of the horizontal portion 53 toward the upper exhaust port 50 are continuously provided. Partition plate 52. The upper end of the standing portion 54 forms a downstream end of the exhaust passage 5 and a downstream end of the cooling passage 8. The downstream end of the exhaust cover 51 that forms the upper portion of the exhaust passage 5 and the downstream end of the passage member 81 that forms the lower portion of the cooling passage 8 are connected to a cylindrical exhaust duct 9 that forms the exhaust port 50. . Thus, the cooling passage 8 is disposed 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 cooling air from the cooling passage 8 are They merge on the downstream side of the downstream ends of the passages 5 and 8 and are discharged to the outside through a single exhaust port 50. Note that the upper end of the standing portion 54 may be extended to the exhaust port 50.

  At the rear of the horizontal portion 53 of the partition plate 52 constituting the exhaust passage 5, an after burner 83 for heating and burning off the oil smoke is disposed with the combustion surface facing upward. An exhaust temperature thermistor (exhaust temperature sensor) 55 for detecting the temperature of the exhaust gas flowing through the exhaust passage 5 is disposed between the exhaust outlet 33a and the afterburner 83. The temperature signal detected by the exhaust temperature thermistor 55 is output to a control unit C described later via a wiring (not shown).

  Accordingly, when the object to be cooked is accommodated in the heating chamber 3a and the circulation fan 6 is rotationally driven by the motor 4, external air is taken in. In this state, when the gas is supplied to the oven burner 43 and ignited, the oven burner 43 The hot air of the combustion exhaust gas generated in step 1 is sent into the heating chamber 3a, and the hot air starts to circulate in the heating chamber 3a forcibly. During oven cooking, while the circulation fan 6 is rotating, outside air is taken into the combustion chamber 3b, so that a part of the hot air in the heating chamber 3a is exhausted including oil smoke generated from the object to be cooked. Then, the gas is discharged from the exhaust outlet 33 a of the upper wall 33 to the exhaust passage 5.

  At this time, since the afterburner 83 is disposed in the exhaust passage 5, when the gas is supplied to the afterburner 83 and ignited, the oil smoke in the exhaust is removed while the exhaust passes through the exhaust passage 5. The afterburner 83 can be heated and burned out, and exhaust gas that has been sufficiently degassed can be discharged from the exhaust port 50.

  Further, since the exhaust passage 5 is disposed in a state of being separated from the cooling passage 8, a relatively large amount of cooling air is vigorously flowed through the cooling passage 8 by the cooling fan 7 and is discharged from the exhaust port 50. Even if it is discharged, it is possible to prevent the influence of the afterburner 83 provided in the exhaust passage 5 on the combustion. In addition, since the afterburner 83 is provided so as to be positioned below the exhaust port 50, the exhaust gas is continuously heated by the afterburner 83 while it rises up the exhaust passage 5 toward the exhaust port 50. The In this way, the heating time of the exhaust gas by the afterburner 83 becomes long, so that the oil smoke can be sufficiently heated and burned by the afterburner 83. The afterburner 83 may be disposed on the exhaust cover 51 so that the combustion surface faces downward.

  The combustion surface of the afterburner 83 is formed in a horizontally long shape over substantially the entire width of the exhaust passage 5 in the left-right width direction, and a peripheral wall is provided upright on the outer periphery of the combustion surface. This peripheral wall makes it difficult for the exhaust gas flowing through the exhaust passage 5 to flow to the combustion surface, and the combustion flame of the afterburner 83 can be prevented from becoming unstable.

  Further, the exhaust gas heated by the afterburner 83 flows toward the exhaust port 50. In the present embodiment, the exhaust passage 5 on the downstream side of the afterburner 83 reaches the downstream end by the partition plate 52 by the partition plate 52. Are disposed adjacent to each other, so that not only the influence of the cooling air on the afterburner 83 can be prevented, but also the exhaust passage 5 between the afterburner 83 and the exhaust port 50 is passed. The exhaust gas can be cooled by cooling air passing through the adjacent cooling passage 8. Thereby, it is possible to prevent the exhaust gas heated to a high temperature from being discharged to the outside through the exhaust port 50.

  Further, the exhaust gas cooled by the cooling air is discharged to the outside from an exhaust port 50 provided at the rear of the stove main body 11. In this embodiment, the downstream end of the cooling passage 8 is downstream of the exhaust passage 5. Since it is located behind the end, two layers are formed: a layer in which high-temperature exhaust flows on the front side of the exhaust port 50 and a layer in which low-temperature cooling air flows on the rear side. In particular, since the cooling air is forcibly discharged from the exhaust port 50 by the cooling fan 7, the exhaust speed is higher than that of the exhaust discharged through the exhaust passage 5 due to an increase in the pressure in the heating chamber 3a, and the temperature is high. Difficult to mix with exhaust. For this reason, even if a wall surface is located behind the exhaust port 50, the wall surface can be protected from high-temperature exhaust by the cooling air.

  FIG. 3 is a block diagram of the heating cooker according to the present embodiment. Branch pipes L1 and L2 branched from the gas supply pipe L are connected to the oven burner 43 and the after burner 83, respectively. A main valve 403 that is opened and closed by pressing of the fire extinguishing switch 70 is arranged in the gas supply pipe L. It is installed. Each of the branch pipes L1 and L2 includes a safety valve 404 and 804 that are electromagnetic valves that are opened when the ignition of the burners 43 and 83 is started, and an electromagnetic valve that adjusts the amount of gas supplied to the burners 43 and 83, respectively. Flow rate adjustment valves 405 and 805 are provided. The opening degree of these safety valves 404 and 804 and flow rate adjustment valves 405 and 805 is adjusted in accordance with a signal from the control unit C. Further, ignition electrodes 401 and 801 and thermocouples 402 and 802 are disposed near the flame holes of the burners 43 and 83, respectively. The ignition electrodes 401 and 801 are each subjected to a spark discharge when a high voltage is applied from the igniter 100. Further, the thermoelectromotive force generated when the thermocouples 402 and 802 are heated by the combustion flame is output to the control unit C.

  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 the heating 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 Circuit, buzzer drive circuit, etc.

  The operation unit 700 includes a cooking start switch 701 for starting cooking, a cooking mode selection switch 702 for performing manual cooking and automatic cooking according to the type of cooking, and a cooking menu switch 703 for selecting a cooking type such as fish dishes. Further, a temperature setting switch 704 for setting the cooking temperature, a cooking time setting switch 705 for setting the cooking time, and the like are provided.

  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.

  To perform oven cooking, the user rotates the door 32 forward, places an object to be cooked such as fish or meat on the plate 13 taken out from the heating chamber 3a, and rotates the door 32 backward. Then, after closing the front opening part of the heating chamber 3a, when the point fire switch 70 is pressed (step ST1), power is supplied from the power supply circuit 900 and the control unit C starts operating, and the main valve 403 Opens. Then, for example, when the user selects automatic cooking with the cooking mode selection switch 702 of the operation unit 700, further selects the fish cooking switch with the cooking menu switch 703, and turns on the cooking start switch 701 (steps ST2 to ST2). ST3) An ON signal is input to the control unit C, and oven cooking is started. At this time, the control unit C determines in advance whether or not the exhaust temperature detected by the exhaust temperature thermistor 55 is lower than the set temperature by a predetermined temperature (for example, −4 ° C.) (step ST4). That is, when oven cooking is performed continuously, the inside of the heating chamber 3a may already be heated to a set temperature or higher. Therefore, if the exhaust temperature detected by the exhaust temperature thermistor 55 is not lower than the set temperature by a predetermined temperature or more (No in step ST4), cooking can be started without igniting the oven burner 43.

  When the exhaust temperature detected by the exhaust temperature thermistor 55 is lower than the set temperature by a predetermined temperature or more (Yes in step ST4), the control unit C starts the timer and energizes the motor 4 to supply the circulation fan 6 and the cooling fan. 7 is rotated at a predetermined initial rotational speed (for example, the maximum rotational speed) (step ST5). Thereby, external air is taken into the combustion chamber 3b.

  When the circulation fan 6 is rotationally driven at a predetermined number of revolutions (Yes in step ST6), the safety valves 404 and 804 are opened, the flow rate adjusting valve 405 is at the maximum heating power, and the flow rate adjusting valve 805 is the standard heating power ( For example, the valve is opened at an opening degree of about 80% of the maximum heating power, and a high voltage is further applied from the igniter 100 to the ignition electrodes 401 and 801 to ignite the oven burner 43 and the afterburner 83 (step ST7). 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 in the heating chamber 3a. If the oven burner 43 is ignited, the oil smoke generated in the heating chamber 3a and sucked together with the hot air from the suction port 31 is passed through the hot air passage 44 and the circulation passage 61 while the lower combustion chamber 3b. It is burned by heating in contact with the hot air that is sent from. Further, during oven cooking, an amount of exhaust corresponding to the supplied gas and taken-in external air flows into the exhaust passage 5 from the exhaust outlet 33a in a state containing oily smoke. The oily smoke in the exhaust gas flowing into the exhaust passage 5 is heated and burned by the afterburner 83 while passing through the exhaust passage 5, and the exhausted smoke is discharged to the outside from the exhaust port 50.

  When the ignition of the oven burner 43 and the afterburner 83 is completed, the control unit C determines that the exhaust temperature detected by the exhaust temperature thermistor 55 is a predetermined temperature (for example, +4) from the set temperature for fish dishes selected by the cooking menu switch 703. It is determined whether or not the temperature is higher than (° C.) (step ST8). When the exhaust temperature becomes higher than the set temperature by a predetermined temperature or more (Yes in step ST8), the safety valve 404 for supplying gas to the oven burner 43 is closed to extinguish the oven burner 43 and to the motor 4 The energization amount is changed to reduce the rotational speed of the circulation fan 6 to about ½ of the initial rotational speed. Further, in order to increase the gas combustion amount of the afterburner 83, the opening degree of the flow rate adjusting valve 805 of the afterburner 83 is increased to the maximum heating power (step ST9). Thereby, since hot air is not sent into the heating chamber 3a from the combustion chamber 3b, the temperature in the heating chamber 3a can be lowered. On the other hand, since high-temperature hot air is not sent from the combustion chamber 3b due to extinction of the oven burner 43 and a decrease in the rotational speed of the circulation fan 6, the oil smoke is hardly burned by heating and a large amount of oil smoke is generated in the heating chamber 3a. However, since the amount of external air taken in decreases due to the decrease in the rotational speed of the circulation fan 6, the amount of exhaust flowing into the exhaust passage 5 from the heating chamber 3a decreases and the exhaust speed flowing through the exhaust passage 5 also decreases. . Furthermore, since the gas combustion amount of the afterburner 83 is increased while the oven burner 43 is extinguished, even if the temperature in the heating chamber 3a is lowered and a large amount of oily smoke is generated, the exhaust passage 5 is surely formed. It is possible to heat and burn off the oil smoke that flows into the tank.

  After the oven burner 43 is extinguished, the control unit C determines that the exhaust temperature detected by the exhaust temperature thermistor 55 is a predetermined temperature (for example, −4 ° C.) or higher than the set temperature for fish dishes selected by the cooking menu switch 703. It is determined whether it has become low (step ST10). When the exhaust temperature becomes lower than the predetermined temperature (Yes in step ST10), the safety valve 404 for supplying gas to the oven burner 43 is opened, and a high voltage is applied from the igniter 100 to the ignition electrode 401, and the oven burner 43 Is ignited again, and the energization amount to the motor 4 is changed to increase the circulation fan 6 to a predetermined initial rotational speed. Further, the opening degree of the flow rate adjustment valve 805 of the afterburner 83 is decreased so that the gas combustion amount of the afterburner 83 becomes equal to that before the fire extinguishing of the oven burner 43 (step ST11). Thereby, since external air is taken in with the same amount of intake as before the fire extinguishing of the oven burner 43, the hot air of the combustion exhaust gas is sent into the heating chamber 3a, and the hot air blown into the heating chamber 3a is sent into the heating chamber 3a. It is circulated to. Since a large amount of oily smoke may be generated in the heating chamber 3a due to temperature adjustment, the gas combustion amount of the afterburner 83 may be reduced after a predetermined time has elapsed after the oven burner 43 is re-ignited. Good.

  The control in the temperature adjustment is performed until the heating time set for the fish dish selected by the cooking menu switch 703 has expired (step ST12). When the predetermined heating time is up (Yes in step ST12), the control unit C closes the safety valve 404 and extinguishes the oven burner 43 (step ST13). However, the rotation drive and afterburner 83 of the circulation fan 6 are turned on. A post-purge operation for maintaining the combustion of is performed (step ST14). That is, even when the oven cooking is finished, the oil smoke generated from the cooking object may remain in the heating chamber 3a. For this reason, if the afterburner 83 is also extinguished immediately after the oven burner 43 is extinguished, there is a possibility that the oil smoke remaining in the heating chamber 3a is discharged outside without being burned out in the exhaust passage 5. Even if the afterburner 83 is combusted, if the circulation fan 6 is stopped, the oil smoke remaining in the heating chamber 3a does not flow into the exhaust passage 5, and when the user opens the door 32, the front opening is opened. Oil smoke may be discharged from the tank. For this reason, even after the oven burner 43 is extinguished, the circulation fan 6 is kept rotating for a predetermined post-purge time and the combustion of the afterburner 83 is maintained. The exhaust gas containing the oily smoke is pushed out into the exhaust passage 5 and can be heated and burned by the afterburner 83. Note that the rotation speed of the circulation fan 6 and the gas combustion amount of the afterburner 83 in the post-purge operation may be the same as those at the start of the oven cooking, or in order to heat and burn off the oil smoke earlier. While increasing the rotation speed of the fan 6, the amount of gas combustion of the afterburner 83 may be increased.

  When the post-purge time ends (Yes in step ST14), the control unit C closes the safety valve 804 to extinguish the afterburner 83, stops energization of the motor 4, and ends oven cooking with a buzzer or the like. Is notified (step ST15).

(Embodiment 2)
The heating cooker of the present embodiment has the same configuration as that of the first embodiment except that the formation area of the exhaust outlet in the heating chamber is different. For this reason, about the same structure as the heating cooker of Embodiment 1, the same reference number is used and only a different part is demonstrated.

  FIG. 5: is the front view which looked at the heating chamber 3a of the state which removed the door from the front downward direction in the heating cooker which concerns on this Embodiment. As shown in the figure, the air outlets 21 are provided on the left and right sides of the rear wall 36 of the heating chamber 3a, and the exhaust outlet 33b is provided on the upper wall 33 above the air outlets. Therefore, according to this heating cooker, the hot air blown from the blower outlet 21 flows toward the door 32 side (front) in the heating chamber 3a, hits the door 32, and then the central portion in the heating chamber 3a. Flows toward the inlet 31. At this time, since the exhaust outlet 33b is provided in the upper wall 33 above the blower outlet 21, the hot air easily flows toward the suction port 31 and hardly flows toward the exhaust outlet 33b. Therefore, it becomes easy for oil smoke from the cooking object to be sucked into the suction port 31, so that it becomes difficult to be directly discharged from the exhaust outlet 33 b, and it is easy to degas by high-temperature hot air, thereby reducing the absolute amount of oil smoke. can do. Thereby, while being able to perform oven cooking efficiently, it can prevent that a lot of oily smoke is discharged | emitted outside.

(Embodiment 3)
The heating cooker of the present embodiment has the same configuration as the heating cooker of the first embodiment, except that an obstacle wall that prevents the flow of exhaust gas to the exhaust outlet is provided near the exhaust outlet. For this reason, about the same structure as Embodiment 1, the same reference number is used and only a different part is demonstrated.

  FIG. 6 is a front view showing the heating chamber 3a with the door removed from the front lower side in the cooking device according to the present embodiment, and FIG. 7 is a schematic cross-sectional main part perspective view showing the rear part. It is. An exhaust outlet 33a is provided at the rear center of the upper wall 33 of the heating chamber 3a. The upper wall 33 in the vicinity of the exhaust outlet 33a extends rearward from the upper wall 33 in front of the exhaust outlet 33a, and An obstacle wall 90 is disposed so as to open to the outside. Thereby, the hot air blown out from the blower outlet 21 flows toward the door 32 side (front) in the heating chamber 3a, and after hitting the door 32, the suction is provided in the center in the heating chamber 3a at the rear. Although it flows toward the port 31 and the exhaust outlet 33a, since the obstacle wall 90 is provided in the vicinity of the exhaust outlet 33a, the inflow of exhaust from the front side is hindered, and it is difficult for hot air to flow into the exhaust outlet 33a. As a result, much of the hot air flows into the suction port 31. Accordingly, high-temperature hot air is likely to stay in the heating chamber 3a, the temperature drop in the heating chamber 3a is suppressed, and the oven cooking can be performed efficiently, and the discharge of oil smoke to the outside is reduced. Can do.

  6 and 7, the obstacle wall 90 is covered except for the rear of the exhaust outlet 33a. However, the obstacle wall 90 may be provided only in front of the exhaust outlet 33a or only in front and below. 6 and 7, the obstacle wall 90 that prevents the inflow of hot air into the exhaust outlet 33a is provided so as to protrude into the heating chamber 3a, but protrudes upward on the upper wall 33 of the heating chamber 3a. A stepped portion may be provided, the exhaust outlet 33a may be formed in the stepped portion, and an obstacle wall may be provided so as to cover the stepped portion. Thereby, it can be set as the heating chamber without a protrusion.

(Other embodiments)
(1) In the above embodiment, in order to circulate hot air in the heating chamber, a suction-type circulation fan is disposed downstream of the oven burner in the hot air flow path, but upstream of the oven burner. A push-type circulation fan may be disposed on the upper side of the oven burner, and a push-type circulation fan may be disposed on the downstream side of the oven burner.
(2) In the above embodiment, the temperature adjustment in the heating chamber is performed based on the exhaust temperature detected by the exhaust temperature sensor. However, the temperature adjustment is performed based on the chamber temperature by providing the chamber temperature sensor in the heating chamber. May be performed. Moreover, you may adjust temperature based on heating time irrespective of temperature.
(3) In the above embodiment, when the oven burner is extinguished during oven cooking, the rotational speed of the circulation fan is reduced in order to reduce the circulating air volume of hot air. However, the circulation fan may be completely stopped. . In the above embodiment, the rotational speed of the circulation fan when the oven burner is re-ignited for temperature adjustment is increased to the initial rotational speed. However, if a certain circulating air volume can be secured, the initial rotational speed is increased. May be lower or may be further increased.
(4) In the above embodiment, when the oven burner is re-ignited for temperature adjustment, the gas combustion amount of the after burner is reduced to the initial gas combustion amount, but the smoke in the heating chamber is reduced by extinguishing the oven burner. Therefore, the amount of gas combustion may remain increased, or the amount of gas burned by the afterburner may be decreased after a certain period of time has elapsed.

3a Heating chamber 3b Combustion chamber 43 Oven burner 4 Motor 5 Exhaust passage 6 Circulating fan 21 Outlet 31 Suction port 33a, 33b Exhaust outlet 61 Circulation passage 50 Exhaust port 83 Afterburner 90 Obstacle wall

Claims (6)

An oven burner that generates hot air by burning gas,
A heating chamber for heating the cooking object;
A circulation fan for circulating hot air generated in the oven burner to the heating chamber;
A motor that rotationally drives the circulation fan;
An exhaust passage that communicates with the heating chamber and exhausts exhaust gas containing oil smoke generated from an object to be cooked in the heating chamber from an exhaust port;
An after burner that is disposed in the exhaust passage and burns gas to heat and burn off the oil smoke in the exhaust gas passing through the exhaust passage;
A control unit for controlling the combustion of the oven burner and the after burner, and the rotational drive of the circulation fan,
The control unit ignites the afterburner during oven cooking, and extinguishes the oven burner for temperature adjustment in the heating chamber,
When extinguishing the oven burner, the reducing the rotational speed of the circulating fans or said circulation fan is stopped, the heating chamber is reduced circulating air volume of hot air that circulates Rutotomoni, increase the gas combustion amount of the afterburner heating cooker to make. The heating cooker according to claim 1, wherein
When the oven burner is re-ignited to adjust the temperature in the heating chamber during oven cooking, the control unit increases the number of rotations of the circulation fan more than when the oven burner is extinguished, so that the heating chamber A cooking device that increases the circulating air volume of hot air circulating in the air. The heating cooker according to claim 1 or 2 ,
When the oven burner is ignited again to adjust the temperature in the heating chamber during oven cooking, the control unit reduces the amount of gas burned in the after burner than when the oven burner is extinguished. In the heating cooker according to any one of claims 1 to 3 ,
The control unit extinguishes the oven burner when a predetermined heating time of the oven cooking is up,
A heating cooker for continuing a predetermined post-purge time, rotation driving of the circulation fan, and combustion of the after burner after extinguishing the oven burner. In the cooking-by-heating machine of any one of Claims 1-4 ,
The heating chamber has a blow-out port and a suction port for circulating hot air on the rear wall of the constituent wall of the heating chamber, and an exhaust outlet communicating with the exhaust passage on the upper wall,
The exhaust outlet is a cooking device provided above the outlet. In the cooking-by-heating machine of any one of Claims 1-5 ,
The heating chamber has an exhaust outlet communicating with the exhaust passage on an upper wall of a constituent wall of the heating chamber, and has an obstacle wall in the vicinity of the exhaust outlet that hinders the flow of exhaust to the exhaust outlet. vessel.

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