JP2011027273A - Heating cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To operate a heater and a steam generator at the same time in a combined cooking mode of a heating cooker. <P>SOLUTION: A controller 70 of a steam convection oven 10 includes a first power variable means (a driving circuit) 74 for varying input power of the heater 20, and a second power variable means (a driving circuit) 75 for varying input power of the steam generator 40. Control is carried out to vary each input power by each driving circuit 74, 75 so as to operate the heater 20 and the steam generator 40 at the same time within a power capacity specified in the steam convection oven 10. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a cooking device equipped with a steam generator such as a steam convection oven.

  Patent Document 1 discloses a cooking device such as a steam convection oven. This cooking device is provided in a cooking chamber for cooking ingredients, and is heated in the cooking chamber by power supply. A heater that is provided in the cooking chamber and convects the air in the cooking chamber by supplying power, a steam generator that supplies steam to the cooking chamber by supplying power, and the cooking chamber that is provided in the cooking chamber. A temperature sensor for detecting the temperature in the cooking chamber, and a control device for controlling on / off of the operation of the heater and the steam generator so that the temperature in the cooking chamber becomes a predetermined temperature based on the temperature detected by the temperature sensor. . In the combined cooking mode, the heating cooker heats food in the cooking chamber with hot air from a heater and a fan and steam sent from a steam generator.

JP 2009-127933 A

  Among the above-mentioned cooking devices, the cooking devices for business use used in kitchens for restaurants and the like need to heat the temperature in the cooking chamber to the cooking temperature in a short time, or various cooking by the cook In order to be able to cope with the method, a high-power heater and a steam generator are often used. In such a combined cooking mode of the cooking device, the heater and the steam generator cannot be operated at the same time due to the power capacity of the cooking device, and the heater that heats the temperature in the cooking chamber to the cooking temperature is activated. The steam generator is controlled to operate when not in operation. However, when the steam concentration in the cooking chamber is set high, if the steam generator cannot be operated sufficiently, there is a problem that the quality of the cooked food is deteriorated. In addition, when the heater and the steam generator are controlled to turn on and off so as to obtain the maximum output, the cooking chamber temperature and steam concentration are controlled to the set cooking temperature and steam concentration. There was a problem that the hunting width of the temperature and the steam concentration became large and the quality of the cooked food became worse. The present invention aims to solve such problems.

  In order to solve the above-described problems, the present invention provides a cooking chamber for cooking foods, a heater provided in the cooking chamber for heating the inside of the cooking chamber by power supply, and steam for supplying steam into the cooking chamber by power feeding. A generator, a temperature sensor in the cooking chamber that detects the temperature in the cooking chamber, an exhaust temperature sensor that detects an exhaust temperature in the exhaust path connected to the cooking chamber, and a warehouse And a controller for controlling the operation of the heater and the steam generator so that the cooking chamber has a predetermined cooking temperature and a predetermined steam concentration based on the detected temperatures of the internal temperature sensor and the exhaust temperature sensor. In the heating cooker, the control device includes first power variable means for changing the input power of the heater and second power variable means for changing the input power of the steam generator, and the control device is defined in the heating cooker. Within power capacity A heating cooker is provided, comprising control means for controlling the input power to be varied by the first and second power varying means so that the steam generator and the steam generator are operated simultaneously. .

  In the cooking device configured as described above, the control device includes first power varying means for varying the input power of the heater, and second power varying means for varying the input power of the steam generator, and the cooking device Control means for controlling the input power to be varied by the first and second power varying means so that the heater and the steam generator are simultaneously operated within the range of the power capacity defined in the above. By reducing the cooking temperature and steam concentration hunting, the food can be cooked at a stable cooking temperature and steam concentration, and can be kept constant without any difference in the heating of the food every time it is cooked. .

  In the heating cooker configured as described above, the control device provides a predetermined maximum allowable power value to the sum of the heater input power and the steam generator input power, and varies the steam generation by the second power variable means. Since the control means for controlling the input power of the apparatus to be a value obtained by subtracting the input power of the heater from the value of the maximum permissible power, when the steam concentration in the cooking chamber is set high, the heater from the maximum permissible power All the electric power except the input electric power can be input to the steam generator, and the steam concentration in the cooking chamber can be maximized within the range of surplus power in the maximum allowable power.

  In the heating cooker configured as described above, the control device operates the steam generator when the detected temperature of the exhaust temperature sensor detects the predetermined first lower limit temperature so that the cooking chamber has a predetermined steam concentration. When the detected temperature of the exhaust temperature sensor detects a predetermined first upper limit temperature, control is performed so that the operation of the steam generator is stopped, and the input power of the steam generator is based on the operation time and the stop time of the steam generator. If the first input power variable control means for controlling the power to be variable by the second power variable means is provided, an inexpensive and low durability sensor such as an oxygen concentration sensor for detecting the vapor concentration is used, and the cost is low. The input power of the steam generator is variably controlled based on the operation time and stop time of the steam generator that operates according to the temperature detected by the exhaust temperature sensor using a highly durable temperature sensor And in, it is possible to lower the manufacturing cost, maintenance frequent replacement of the sensor is not necessary. Note that the first input power variable control means, as one embodiment, has the input power of the steam generator according to the value obtained by dividing the time from the operation of the steam generator to the operation after the stop by the time from the operation to the stop. May be controlled to be varied by the second power varying means.

  In the cooking device configured as described above, when the sprinkler valve is provided in the exhaust path and opens the sprinkler valve, the sprinkler sprinkles the temperature sensing part of the exhaust temperature sensor, and the air supply valve is opened by being connected to the cooking chamber. An air supply path for introducing outside air, and the control device controls the open air valve to open and introduces the outside air into the cooking chamber while the steam generator is in operation. When the detected temperature of the temperature sensor detects a predetermined second upper limit temperature, the sprinkler valve is opened, and when the detected temperature of the exhaust temperature sensor detects the predetermined second lower limit temperature, the sprinkler valve is closed. When the second input power control means for controlling the input power of the steam generator to be varied by the second power varying means according to the time during which the watering valve is closed under the control of the valve operation is provided. The steam concentration in the cooking chamber is set When the steam concentration becomes higher, the air supply valve is opened and the outside air is introduced while the steam generator is in operation, so that the steam concentration in the cooking chamber is set to the predetermined steam concentration while discharging excess steam. In addition, by introducing the outside air into the cooking chamber, the odor of the ingredients is not filled in the cooking cabinet, and it becomes difficult for the ingredients to smell each other during cooking. Also, the closing time of the water spray valve that operates according to the detected temperature of the exhaust temperature sensor using an inexpensive and highly durable temperature sensor without using an expensive and lowly durable sensor such as an oxygen concentration sensor that detects the vapor concentration By variably controlling the input power of the steam generator based on the above, the manufacturing cost can be reduced, and the maintenance for frequently replacing the sensor becomes unnecessary.

  In the cooking device configured as described above, the control device executes the first input power variable control means when the inside of the cooking chamber is set to have a predetermined high concentration of steam concentration, When the steam concentration is set to a predetermined low concentration, the second input power variable control means is controlled so that the steam concentration in the cooking chamber is set to a high concentration with one heating cooker. Alternatively, the concentration can be controlled to be low.

It is a front view of the steam convection oven of the present invention. It is a cross-sectional view in the AA line of FIG. It is a longitudinal cross-sectional view in the BB line of FIG. It is a longitudinal cross-sectional view in the CC line of FIG. It is a block diagram of the control apparatus of a steam convection oven. It is a graph which shows the relationship between time t1 / time t2 controlled by the 1st input power variable control means, and input power of a steam generator. It is a graph which shows the relationship between time t3 controlled by the 2nd input electric power variable control means, and the input electric power of a steam generator.

  Hereinafter, a steam convection oven which is an embodiment of a heating cooker according to the present invention will be described with reference to the drawings. The steam convection oven 10 includes a cooking chamber 11 for cooking ingredients, a heater 20 provided in the cooking chamber 11 for heating the inside of the cooking chamber by power supply, and steam generation for supplying steam to the cooking chamber by power supply. A device 40, a temperature sensor 13 provided in the cooking chamber 11 for detecting the temperature in the cooking chamber 11, and a discharge tank 15 in an exhaust path connected to the cooking chamber 11 are provided to control the exhaust temperature. The heater 20 and the steam generator are configured so that the inside of the cooking chamber 11 has a predetermined steam concentration at a predetermined cooking temperature based on the detected temperatures of the exhaust temperature sensor 16 to be detected, the internal temperature sensor 13 and the exhaust temperature sensor 16. And a control device 70 that controls the operation of the motor 40. Thus, the control device 70 includes a drive circuit (first power variable means) 74 that varies the input power of the heater 20 and a drive circuit (second power variable means) 76 that varies the input power of the steam generator 40. And a control means for controlling the input power to be varied by the drive circuits 74 and 75 so that the heater 20 and the steam generator 40 are simultaneously operated within the range of the power capacity defined in the steam convection oven 10. I have. Below, this steam convection oven 10 is explained in full detail.

  The steam convection oven 10 has an oven cooking mode, a steam cooking mode, and a combined cooking mode. In the oven cooking mode, the food in the cooking chamber 11 is heated by hot air generated by the heater 20 and the fan 30. In the steam cooking mode, the food in the cooking chamber 11 is heated by steam sent by the fan 30 and the steam generator 40, and in the combined cooking mode, hot air and steam generated by the heater 20, the fan 30, and the steam generator 40 are used. The ingredients in the cooking chamber 11 are heated. The steam convection oven 10 has a manual mode and a program mode. In the manual mode, the selection of each cooking mode, the cooking temperature, the steam concentration, and the cooking time can be freely set according to how the food is cooked. In the program mode, each cooking mode, cooking time, steam concentration, and cooking temperature are set in advance according to how the food is cooked.

  The steam convection oven 10 includes a cooking chamber 11, a heater 20, a fan 30, a steam generator 40, an air supply / exhaust device 50, an operation panel 60, and a control device 70 in a casing 10 a.

  As shown in FIG.1 and FIG.2, the cooking chamber 11 is for accommodating foodstuffs and cooking by heating, and can accommodate foodstuffs by the heat insulation door 12 which opens and closes some opening of the box-shaped front surface. It has become. In the cooking chamber 11, an internal temperature sensor 13 for detecting the temperature in the cooking chamber 11 is provided. Moreover, as shown in FIG.2 and FIG.3, in the cooking chamber 11, the steam inlet 11a which introduce | transduces the steam by the steam generator 40, and the supply / exhaust port 11b which supplies and exhausts the air in the cooking chamber 11 are provided. A discharge port 11c for discharging water in the cooking chamber 11 is provided. A discharge pipe 14 for discharging water in the cooking chamber 11 is connected to the discharge port 11 c of the cooking chamber 11, and this discharge pipe 14 is connected to a discharge tank 15 that also serves as a drainage path of the steam generator 40. It is connected. The air containing the steam in the cooking chamber 11 is discharged from the discharge pipe 14 to the outside through the discharge tank 15, and the discharge pipe 14 and the discharge tank 15 constitute an exhaust path described in the claims. . In the discharge tank 15, there are an exhaust temperature sensor 16 that detects the temperature of the exhaust discharged together with water from the cooking chamber 11, and a sprinkler 17 that sprinkles the temperature sensing part of the exhaust temperature sensor 16 when the water spray valve 18 is opened. Is provided.

  As shown in FIG.2 and FIG.3, the heater 20 heats the inside of the cooking chamber 11 with electric power feeding. The heater 20 is a well-known electric heater such as a sheathed heater, and is attached to the left side wall of the cooking chamber 11 so as to form an annular shape.

  As shown in FIG.2 and FIG.3, the fan 30 convects the air in the cooking chamber 11 by electric power feeding. The fan 30 is a centrifugal fan such as a sirocco fan, and is rotatably attached to the inside of the heater 20 attached in a ring shape on the left side wall of the cooking cabinet 11. When the fan 30 drives and rotates the fan motor 31, the air in the cooking chamber 11 is blown to the heater 20 to convect the cooking chamber 11 as hot air.

  As shown in FIG.2 and FIG.4, the steam generator 40 supplies a vapor | steam in the cooking chamber 11 by electric power feeding, and is provided in the position which becomes the left side of the cooking chamber 11 within the casing 10a. The steam generator 40 includes a cylindrical evaporation container 41, a conductive heating body made of a metal bar member accommodated in the evaporation container 41, and an induction heating coil 42 wound around the outer periphery of the evaporation container 41. An induction heating type steam generator comprising: The steam generator 40 generates heat by supplying a high-frequency current to the induction heating coil 42 to generate heat by evaporating the water in the evaporation container 41 with the heating element that generates heat. A vapor supply pipe 43 connected to the vapor inlet 11 a in the cooking chamber 11 is attached to the upper end of the evaporation container 41, and steam generated in the evaporation container 41 is sent into the cooking chamber 11 through the vapor supply pipe 43. It is done. The lower end of the evaporation container 41 is attached to a discharge tank 15 for discharging water in the cooking chamber 11, and the water in the evaporation container 41 is discharged to the outside through the discharge tank 15.

  As shown in FIGS. 2 and 4, the air supply / exhaust device 50 is for supplying and exhausting air into the cooking chamber 11, and is provided with an air supply / exhaust tube (air supply path) 51 and an inside of the air supply / exhaust tube 51. And an air supply valve motor 53 for rotating the air supply valve 52. The air supply / exhaust cylinder 51 is connected to an air supply / exhaust port 11 b formed at a position on the left side surface of the cooking chamber 11 on the back side of the fan 30. The air supply valve 52 is rotatably provided in an intermediate portion of the air supply / exhaust tube 51, and adjusts the amount of air passing through the air supply / exhaust tube 51 by changing the opening by the operation of the air supply valve motor 53. To do. In the air supply / exhaust device 50, when the air supply valve 52 is opened while the fan 30 is operated, the air outside the cooking chamber 11 is introduced into the cooking chamber 11 through the air supply / exhaust tube 51 by the rotation of the fan 30. When the air supply valve 52 is opened in a state where the fan 30 is not operated, the cooking chamber 11 passes through the supply / exhaust tube 51 by the steam supplied from the steam generator 40 or the steam generated from the food by the steam generator 40. 11 is discharged outside.

  The operation panel 60 selects a manual mode or a program mode by inputting a button, selects a cooking mode suitable for food to be cooked in the cooking chamber 11, sets cooking temperature, steam concentration and cooking time, and selects a cooking program. To do.

  The control device 70 includes a microcomputer 71. As shown in FIG. 5, the inside temperature sensor 13, the exhaust temperature sensor 16, the water spray valve 18, the heater 20, the fan motor 31, the steam generator 40, and the air supply valve are used. The motor 53 and the operation panel 60 are connected. The control device 70 includes a memory 72 and a timer 73, and the memory 72 stores a cooking program in the program mode. The timer 73 measures the cooking time and measures the operation time and stop time of the steam generator 40 and the closing time of the water spray valve 18.

  The control device 70 includes drive circuits 74 to 76 connected to the heater 20, the fan motor 31, and the steam generation device 40, respectively. The drive circuit 74 is a phase control circuit, and changes the input power of the heater 20 by changing the phase of the voltage. The drive circuits 75 and 76 are inverter circuits, and change the input power of the fan motor 31 and the steam generator 40 by increasing or decreasing the drive time of the switching element. The control device 70 variably controls the electric power input to the heater 20, the fan motor 31 and the steam generator 40 by the drive circuits 74 to 76, and outputs the heater 20, the rotation speed of the fan motor 31, or the steam of the steam generator 40. Variable amount control. The drive circuits 74 and 76 use a phase control circuit and an inverter circuit in the present embodiment, but the present invention is not limited to this, and the power input to the devices 20 and 40 using other circuits. May be varied.

  The control device 70 controls the operation of the heater 20 and the fan 30 so that the cooking chamber 11 has a cooking temperature suitable for oven cooking based on the temperature detected by the inside temperature sensor 13 in the oven cooking mode. In the steam cooking mode, control means for controlling the operation of the fan 30 and the steam generator 40 so that the inside of the cooking chamber 11 becomes a cooking temperature suitable for steam cooking based on the temperature detected by the inside temperature sensor 13; In the combined cooking mode, the heater 20, the fan 30, and the steam generator are configured so that the cooking chamber 11 has a cooking temperature and steam concentration suitable for combined cooking based on the detected temperatures of the internal temperature sensor 13 and the exhaust temperature sensor 16. And a control means for controlling the operation with 40.

  The control device 70 has each input power by the drive circuits 74 to 76 so that the heater 20, the fan 30, and the steam generator 40 are simultaneously operated within the range of the power capacity defined as the maximum power consumption of the steam convection oven 10. There is provided a control means for controlling so as to be variable.

  Further, the control device 70 provides a predetermined maximum allowable power value as the maximum value of the sum of the input power of the heater 20 and the input power of the steam generator 40, and the input power of the steam generator 40 that is varied by the drive circuit 76. Is provided with control means for controlling so that the value obtained by subtracting the input power of the heater 20 from the value of the maximum allowable power.

  In addition, when the detected temperature of the exhaust temperature sensor 16 detects the predetermined first lower limit temperature so that the cooking chamber 11 has a predetermined steam concentration, the control device 70 operates the steam generator 40 to detect the exhaust temperature sensor 16. When the temperature detects a predetermined first upper limit temperature, the operation of the steam generator 40 is controlled to be stopped, and the time t1 from the operation of the steam generator 40 measured by the timer 73 to the operation again after the stop is operated. There is provided first input power variable control means for controlling the input power of the steam generator 40 so as to be varied by the drive circuit 76 in accordance with the value divided by the time t2 from stop to stop. More specifically, when the output of the steam generating device 40 is large, the time t1 for restarting after the operation of the steam generating device 40 is increased, or the time t2 for stopping the operation of the steam generating device 40 is shortened. Further, when the output of the steam generating device 40 is small, the time t1 for restarting the operation after the operation of the steam generating device 40 is shortened, or the time t2 for stopping the operation of the steam generating device 40 is lengthened. From this, as shown in FIG. 6, the control device 70 controls the input power of the steam generator 40 to be decreased by the drive circuit 76 when the value of t1 / t2 increases, and the value of t1 / t2 decreases. Then, the input power of the steam generator 40 is controlled to be increased by the drive circuit 76. Note that the control device 70 normally variably controls the input power of the steam generator 40 by the drive circuit 76 so that the value of t1 / t2 is 0.5.

  Further, the control device 70 performs control so that the air supply valve 52 is opened and the outside air is introduced into the cooking chamber 11 in a state where the steam generating device 40 is operated, and under this control, the exhaust temperature sensor 16 is controlled. When the detected temperature detects a predetermined second upper limit temperature, the sprinkler valve 18 is opened, and when the detected temperature of the exhaust temperature sensor 16 detects the predetermined second lower limit temperature, the sprinkler valve 18 is closed. And a second input power variable control means for controlling the input power of the steam generator 40 to be varied by the drive circuit 76 in accordance with the time t3 when the water spray valve 18 is closed under the control of the operation 18. Yes. More specifically, when the output of the steam generator 40 is large, the exhaust temperature from the cooking chamber 11 decreases due to the excessively supplied steam when hunting, and the detected temperature of the exhaust temperature sensor 16 is the second temperature. From the time when the lower limit temperature is detected, the time for detecting the second upper limit temperature, that is, the closing time t3 of the water spray valve 18 becomes longer. Further, when the output of the steam generator 40 is small, the second time from the time when the detected temperature of the exhaust temperature sensor 16 detects the second lower limit temperature, contrary to when the output of the steam generator 40 is large. The time for detecting the upper limit temperature, that is, the closing time t3 of the water spray valve 18 is shortened. Therefore, as shown in FIG. 7, the control device 70 controls the input power of the steam generator 40 to be reduced by the drive circuit 76 when the closing time t3 of the water spray valve 18 becomes longer, and the water spray valve 18 is closed. When the time t3 becomes shorter, the input power of the steam generator 40 is controlled to be increased by the drive circuit 76.

  Further, when the controller 70 is set so that the inside of the cooking chamber 11 has a predetermined high-concentration steam concentration (for example, 90%), the input power of the steam generator 40 is driven by the first input power variable control means. When the inside of the cooking chamber 11 is set to have a predetermined low-concentration steam concentration (for example, 40%), the input power of the steam generator 40 is driven by the second input power variable control means. Control means for controlling the circuit 76 so as to be variable is provided. The high concentration vapor concentration is, for example, 70% to 90%, and the low concentration vapor concentration is, for example, 40% to 69%, but the present invention is not limited to this. .

  In the combined cooking mode in the program mode of the steam convection oven 10 configured as described above, the set cooking temperature in the cooking chamber 11 is 200 ° C., the set steam concentration is 100%, 90% (steam concentration is high), 40% The operation when the vapor concentration is high will be described. When the combined cooking mode is executed in the program mode, the control device 70 controls the operation of the heater 20 and the fan 30 based on the inside temperature sensor 13 so that the inside of the cooking chamber 11 is set to 200 ° C. as the set cooking temperature as pre-heat treatment. To do. When the food is stored in the cooking chamber 11 after the pre-heat treatment is finished, the control device 70 causes each set steam concentration (100%, 90%, or 40%) at 200 ° C. with the cooking chamber 11 as the set cooking temperature as the heat treatment. Further, the operations of the heater 20, the fan 30, and the steam generator 40 are controlled based on the detected temperatures of the internal temperature sensor 13 and the exhaust temperature sensor 16. Below, control by the control apparatus 70 is demonstrated for every each setting vapor | steam density | concentration in the cooking chamber 11. FIG.

  In the control of heat cooking in which the set cooking temperature in the cooking chamber 11 is set to 200 ° C. and the set steam concentration in the cooking chamber 11 is set to 100%, a control device is provided when food is stored in the cooking chamber 11 after the pre-heat treatment is finished. 70 operates the fan 30 and controls the operation of the heater 20 based on the temperature detected by the internal temperature sensor 13 so that the inside of the cooking chamber 11 becomes 200 ° C. More specifically, the control device 70 operates the heater 20 when the temperature detected by the internal temperature sensor 13 reaches 195 ° C., which is the lower limit threshold, so that the temperature inside the cooking chamber 11 becomes 200 ° C., and the internal temperature sensor When the detected temperature 13 becomes 205 ° C., which is the upper limit threshold value, the heater 20 is stopped. At this time, the control device 70 controls the drive circuit 74 to vary the power input to the heater 20 in order to reduce the hunting width between the upper limit threshold and the lower limit threshold of the set temperature, and the output of the heater 20 is controlled. I have control.

  Moreover, the control apparatus 70 controls the action | operation of the steam generator 40 so that the vapor | steam density | concentration in the cooking chamber 11 may be 100%. More specifically, the control device 70 causes the drive circuit 74 to vary the input power of the steam generator 40 that is varied by the drive circuit 76 from the value of the maximum allowable power so that the steam concentration in the cooking chamber 11 becomes 100%. By controlling the input power of the heater 20 to be a value obtained by reducing the input power of the heater 20, the operation of the heater 20 is variably controlled so that the temperature in the cooking chamber 11 becomes 200 ° C., and the steam concentration in the cooking chamber 11 Is variably controlled by the drive circuit 76 so that the input power of the steam generator 40 is maximized within the range of the maximum allowable power so that the power becomes 100%.

  Next, in the control of the heating cooking (heating cooking with a high steam concentration) in which the set steam concentration in the cooking chamber 11 is 90%, the control device 70 controls the operation of the heater 20 as described above. The operation of the steam generator 40 is controlled by the first input power variable control means so that the steam concentration in the cooking chamber 11 becomes 90%. More specifically, the control device 70 operates the steam generation device 40 when the detected temperature of the exhaust temperature sensor 16 reaches 120 ° C., which is the first lower limit temperature, so that the steam concentration in the cooking chamber 11 becomes 90%. When the temperature detected by the exhaust temperature sensor 16 reaches 125 ° C., which is the first upper limit temperature, the operation of the steam generator 40 is stopped. At this time, the control device 70 determines the value of the steam generation device 40 according to a value obtained by dividing the time t1 from the operation of the steam generation device 40 measured by the timer 73 to the operation again after the stop by the time t2 from the operation to the stop. The input power is controlled to be variable by the drive circuit 76. That is, as shown in FIG. 6, the control device 70 controls the input power of the steam generator 40 to be reduced by the drive circuit 76 when the value of t1 / t2 increases, and when the value of t1 / t2 decreases, The input power of the generator 40 is controlled by the drive circuit 76 so as to increase.

  Next, in the control of heating cooking (heating cooking with a low steam concentration) in which the set steam concentration in the cooking chamber 11 is 40%, the control device 70 controls the operation of the heater 20 in the same manner as described above. The operation of the steam generator 40 is controlled by the second input power variable control means so that the steam concentration in the cooking chamber 11 becomes 40%. More specifically, when the vapor concentration in the cooking chamber 11 is set to a low vapor concentration such as 40%, the vapor concentration in the cooking chamber 11 is the set vapor concentration due to the steam generated from the heated food. % May be higher. Therefore, the control device 70 performs control so that the air supply valve 52 is opened in a state where the steam generation device 40 is operated and air outside the cooking chamber 11 is introduced into the cooking chamber 11. Under this control, the control device 70 opens the water spray valve 18 when the detected temperature of the exhaust temperature sensor 16 reaches 150 ° C. as the predetermined second upper limit temperature, and the detected temperature of the exhaust temperature sensor 16 reaches the predetermined second temperature. When the lower limit temperature is 145 ° C., the water spray valve 18 is closed. The control device 70 controls the drive circuit 76 to vary the input power of the steam generator 40 in accordance with the time t3 when the water spray valve 18 is closed as measured by the timer 73. That is, as shown in FIG. 7, the control device 70 controls the input power of the steam generating device 40 to be reduced by the drive circuit 76 when the closing time t3 of the water spray valve 18 becomes longer, and the closing time t3 of the water spray valve 18. Is reduced, the input power of the steam generator 40 is controlled to be increased by the drive circuit 76.

  In the steam convection oven 10 configured as described above, the control device 70 includes a drive circuit 74 that varies the input power of the heater 20 and a drive circuit 76 that varies the input power of the steam generator 40, and the steam convection oven. 10 is provided with control means for controlling the input power to be varied by the drive circuits 74 and 76 so that the heater 20 and the steam generator 40 are simultaneously operated within the range of the power capacity defined in FIG. The cooking temperature and steam concentration hunting in 11 can be made small so that the food can be cooked at a stable cooking temperature and steam concentration. Can do.

  Further, in the steam convection oven 10, the control device 70 provides a predetermined maximum allowable power value to the sum of the input power of the heater 20 and the input power of the steam generation device 40, and the steam generation device is variable by the drive circuit 76. Since the control means for controlling the input power of 40 to a value obtained by subtracting the input power of the heater 20 from the value of the maximum allowable power is provided, when the steam concentration in the cooking chamber 11 is set as high as 100%, for example. All the electric power excluding the input power of the heater 20 from the maximum allowable power can be input to the steam generator 40, and the steam concentration in the cooking chamber 11 is maximized within the range of the surplus power in the maximum allowable power. can do.

  Further, in the steam convection oven 10, the control device 70 detects a predetermined first lower limit temperature of the exhaust gas temperature sensor 16 so that the inside of the cooking chamber 11 has a predetermined vapor concentration, and the steam generation device. 40, when the detected temperature of the exhaust gas temperature sensor 16 detects a predetermined first upper limit temperature, the operation of the steam generator 40 is controlled to be stopped, and based on the operation time and the stop time of the steam generator 40 As a value, the input power of the steam generator 40 is driven according to a value obtained by dividing the time t1 from the operation of the steam generator 40 measured by the timer 73 until the operation is restarted after the stop by the time t2 from the operation to the stop. First input power variable control means for controlling to be variable by 76 is provided. As a result, the control device 70 does not use an expensive and low durability sensor such as an oxygen concentration sensor, but operates according to the temperature detected by the exhaust temperature sensor 16 using an inexpensive and highly durable temperature sensor. By variably controlling the input power of the steam generator 40 based on the operation time and the stop time, the manufacturing cost of the heating cooker 10 can be reduced, and the maintenance for frequently replacing the sensors becomes unnecessary.

  In the steam convection oven 10, the control device 70 controls the open air valve 52 to open and introduces outside air into the cooking chamber 11 with the steam generating device 40 activated. When the detected temperature of the exhaust temperature sensor 16 detects the predetermined second upper limit temperature, the water spray valve 18 is opened, and when the detected temperature of the exhaust temperature sensor 16 detects the predetermined second lower limit temperature, the water spray valve 18 is closed. And the second input power control means for variably controlling the input power of the steam generator 40 by the drive circuit 76 according to the time during which the water spray valve 18 is closed under the control of the operation of the water spray valve 18. It has. Thereby, the heating cooker 10 is in the state which operated the steam generation apparatus 40, when the vapor | steam density | concentration in the cooking chamber 11 becomes higher than a setting vapor | steam density | concentration because the setting vapor | steam density | concentration in the cooking cabinet 11 was set low. By opening the air supply valve 52 and introducing outside air, the steam concentration in the cooking chamber 11 can be set to a predetermined vapor concentration while discharging excess steam, and the outside air is introduced into the cooking chamber 11. By doing so, the smell of foodstuffs is no longer filled in the cooking cabinet 11, and it becomes difficult for the foodstuffs to smell each other during cooking. Further, the control device 70 does not use an expensive and low-durability sensor such as an oxygen concentration sensor that detects the vapor concentration, but uses the temperature detected by the exhaust temperature sensor 16 using a low-cost and high-durability temperature sensor. Since the input power of the steam generator 40 is variably controlled based on the closing time of the watering valve 18 to be operated, the manufacturing cost of the heating cooker 10 can be reduced, and maintenance for frequently replacing the sensors is not necessary.

  In the steam convection oven 10, the control device 70 executes the first input power variable control means when the inside of the cooking chamber 11 is set to 90% as a predetermined high-concentration steam concentration, and the cooking chamber 11 When the inside of 11 is set to be, for example, 40% as a predetermined low-concentration vapor concentration, control is performed so as to execute the second input power variable control means. The vapor concentration can be controlled to be high or low.

  DESCRIPTION OF SYMBOLS 10 ... Cooking device (steam convection oven), 11 ... Cooking chamber, 13 ... Inside temperature sensor, 16 ... Exhaust temperature sensor, 17 ... Sprinkler, 18 ... Sprinkling valve, 20 ... Heater, 30 ... Fan, 40 ... Steam Generating device 51... Air supply path (supply / exhaust cylinder) 52. Air supply valve 70. Control device 74. First power variable means (drive circuit) 76 76 Second power variable means (drive circuit)

Claims (6)

A cooking chamber for cooking ingredients;
A heater that is provided in the cooking chamber and heats the cooking chamber by power supply;
A steam generator for supplying steam into the cooking chamber by supplying power;
An internal temperature sensor that is provided in the cooking chamber and detects the temperature in the cooking chamber;
An exhaust temperature sensor that is provided in an exhaust path connected to the cooking chamber and detects an exhaust temperature;
The operation of the heater and the steam generator is controlled based on the detected temperatures of the internal temperature sensor and the exhaust temperature sensor so that the inside of the cooking chamber has a predetermined cooking temperature and a predetermined steam concentration. In a heating cooker equipped with a control device,
The control device includes first power variable means for varying the input power of the heater, and second power variable means for varying the input power of the steam generator,
The control device controls the input power to be varied by the first and second power varying means so that the heater and the steam generating device are simultaneously operated within the range of the power capacity defined for the cooking device. A heating cooker characterized by comprising control means for performing. The heating cooker according to claim 1, wherein
The control device sets a predetermined maximum allowable power as a maximum value of the sum of the input power of the heater and the input power of the steam generation device, and varies the input power of the steam generation device by the second power variable means. A heating cooker characterized by comprising control means for controlling the value so that the value of the maximum allowable power is subtracted from the input power of the heater. The heating cooker according to claim 1 or 2,
When the detected temperature of the exhaust temperature sensor detects a predetermined first lower limit temperature so that the cooking chamber has a predetermined steam concentration, the control device operates the steam generator to detect the detected temperature of the exhaust temperature sensor. When the predetermined first upper limit temperature is detected, the operation of the steam generator is controlled to be stopped, and the input power of the steam generator is set to the second power based on the operation time and the stop time of the steam generator. A heating cooker comprising first input power variable control means that is controlled to be variable by a variable means. The cooking device according to claim 3,
The first input power variable control means is configured to change the input power of the steam generator according to a value obtained by dividing the time from the operation of the steam generator to the operation again after the stop by the time from the operation to the stop. A cooking device characterized by being controlled so as to be variable by electric power variable means. In the heating cooker according to any one of claims 1 to 4,
A water sprinkler for sprinkling water on the temperature sensing part of the exhaust temperature sensor when opening the water sprinkling valve provided in the exhaust path;
An air supply path that is connected to the inside of the cooking chamber and introduces outside air when the air supply valve is opened;
The control device controls the open air valve to be opened in a state where the steam generating device is operated to introduce outside air into the cooking chamber, and under this control, the detected temperature of the exhaust temperature sensor is controlled. When the predetermined second upper limit temperature is detected, the watering valve is opened, and when the detected temperature of the exhaust temperature sensor detects the predetermined second lower limit temperature, the watering valve is closed and the operation of the watering valve is controlled. And a second input power control means for controlling the input power of the steam generator to be varied by the second power varying means in accordance with the time during which the watering valve is closed under the control of A heating cooker featuring. The cooking device according to claim 5,
The controller executes the one-input power variable control means when the cooking chamber is set to have a predetermined high concentration steam concentration, and the cooking chamber has a predetermined low concentration steam concentration. When set as described above, the cooking device is controlled to execute the second input power variable control means.

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