JP2007032889A - Heating cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heating cooker capable of effectively suppressing oxidation of food by preventing an increase of oxygen concentration in a heating chamber during cooking with superheated steam. <P>SOLUTION: The heating cooker comprises a steam generator 40 for generating steam; the heating chamber 20 heating a heated object with steam supplied from the steam generator 40; a circulating line 60 for circulating steam through the steam generator 40 and the heating chamber 20; a blower fan 28 for blowing air to the circulating line 60; an exhaust passage (an ejection passage 64 and an exhaust duct 65) with one end connected to an exhaust port provided at the heating chamber 20 and with the other end opened to the atmosphere; and a control device 80 for controlling the rotating speed of the blower fan 28. The control device 80 controls the operation of the blower fan 28 not to increase oxygen concentration in the heating chamber 20 during cooking with steam supplied from the steam generator 40. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a cooking device.

  2. Description of the Related Art Conventionally, as a cooking device that uses steam to cook an object to be heated such as food, there is one that sends superheated steam into an oven cabinet (see, for example, Patent Document 1 (Japanese Patent Laid-Open No. Hei 8-49854)). . This heating cooker includes a steam generator that generates steam by providing a heater in a pot, and a steam superheater that generates superheated steam by heating the steam generated by the steam generator, The superheated steam generated in the oven is sent into the oven to cook food.

  In the conventional heating cooker, the superheated steam generated by the steam superheater is blown into the oven chamber from the blower outlet provided at the upper side of the oven cabinet by the blower fan and sucked from the suction port provided at the lower side of the oven cabinet. Circulate in the oven cabinet and through the circulation passage. Then, the air in the oven chamber is discharged to the outside from the exhaust port, and the inside of the oven chamber is replaced with superheated steam. Thereby, the oxygen concentration in an oven chamber is made low and the low oxygen cooking which suppressed the oxidation of foodstuffs is attained.

By the way, in the heating cooker, when water is supplied into the pot of the steam generating device during cooking with superheated steam, the water temperature in the pot is lowered and steam generation is temporarily stopped. For this reason, there is a problem that the temperature in the heating chamber decreases, outside air enters through the exhaust port, the oxygen concentration in the oven chamber increases, and low oxygen cooking that suppresses the oxidation of food cannot be performed.
JP-A-8-49854

  Therefore, an object of the present invention is to provide a cooking device that can prevent the oxygen concentration in the heating chamber from increasing during cooking by steam and can effectively suppress oxidation of food.

In order to achieve the above object, the heating cooker of the present invention comprises:
A steam generator for generating steam;
A heating chamber for heating an object to be heated by steam supplied from the steam generator;
A circulation path for circulating steam through the steam generator and the heating chamber;
A blower fan that sends wind to the circulation path;
An exhaust passage having one end connected to an exhaust port provided in the heating chamber and the other end opened to the atmosphere;
A control device for controlling the rotational speed of the blower fan,
The control device controls the operation of the blower fan so that the oxygen concentration in the heating chamber does not increase during cooking by steam supplied from the steam generator.

  According to the heating cooker having the above configuration, when cooking with steam supplied from the steam generator, air is sent to the circulation path by the blower fan, and the steam is circulated through the steam generator and the heating chamber. The object to be heated is heated by the steam supplied from the steam generator to the heating chamber. At this time, the air in the heating chamber is discharged from the exhaust port provided in the heating chamber through the exhaust passage, and the heating chamber is brought into a low oxygen concentration state. Then, the operation of the blower fan is controlled so that the oxygen concentration in the heating chamber does not increase during cooking. That is, when the water temperature in the steam generator is lowered due to water supply, for example, by stopping the blower fan or lowering the rotation speed of the blower fan, the temperature drop in the heating chamber is suppressed and the heating chamber is set via the exhaust passage. It is possible to prevent the outside air from entering. Thereby, it is possible to prevent the oxygen concentration in the heating chamber from increasing during cooking by steam, and to effectively suppress the oxidation of the food.

  Moreover, the cooking device of one embodiment WHEREIN: The said control apparatus stops the said ventilation fan in the water supply period of the said steam generator at least during the said cooking, or the rotation speed of the said ventilation fan is during the said heating cooking The rotation speed is lower than the predetermined rotation number.

  According to the cooking device of the above embodiment, the control device is configured to circulate wind through the circulation path when the water temperature in the steam generating device is lowered by stopping the blower fan at least during the water supply period of the steam generating device during cooking. Therefore, the temperature drop in the heating chamber can be reliably prevented. Or by the said control apparatus, by making the rotation speed of a ventilation fan lower than the predetermined rotation speed during heating cooking at least in the water supply period of a steam generator, a wind is not circulated to a circulation path at the time of the water temperature fall in a steam generator. Therefore, the temperature drop in the heating chamber can be reliably prevented.

Moreover, the heating cooker of one embodiment is
A water temperature sensor for detecting the water temperature in the generator,
The control device controls the operation of the blower fan in accordance with the water temperature in the steam generator detected by the water temperature sensor so that the oxygen concentration in the heating chamber does not increase during the cooking. And

  According to the heating cooker of the above embodiment, the control device controls the operation of the blower fan according to the water temperature in the steam generator detected by the water temperature sensor, so that it is adjusted when the water temperature in the steam generator decreases. Thus, the blower fan can be stopped or rotated at a low speed.

  Further, in the heating cooker according to one embodiment, the control device causes the water temperature in the steam generating device detected by the water temperature sensor from the start of water supply to the steam generating device during the cooking to become a predetermined temperature or higher. The blower fan is stopped or the rotational speed of the blower fan is made lower than a predetermined rotational speed during the cooking.

  According to the cooking device of the above-described embodiment, the control device detects the blowing fan from the start of water supply of the steam generating device during cooking until the water temperature in the steam generating device is detected by the water temperature sensor to a predetermined temperature or higher. By stopping, since the wind is not sent to the circulation path when the water temperature in the steam generator is lowered, the temperature drop in the heating chamber can be reliably prevented. Alternatively, by the control device, the rotation speed of the blower fan is made lower than the predetermined rotation speed during cooking until the water temperature in the steam generation apparatus is detected by the water temperature sensor from the start of water supply to the predetermined temperature or higher. As a result, since the wind is not circulated through the circulation path when the water temperature in the steam generator is lowered, the temperature drop in the heating chamber can be reliably prevented.

  As is clear from the above, according to the cooking device of the present invention, the cooking device capable of effectively suppressing the oxidation of food by preventing the oxygen concentration in the heating chamber from increasing during cooking using steam. Is to realize.

  Hereinafter, the cooking device of the present invention will be described in detail with reference to the illustrated embodiments.

  FIG. 1 is an external perspective view of a heating cooker 1 according to an embodiment of the present invention, and a door 12 is provided on the front surface of a rectangular parallelepiped main body casing 10 that rotates about a lower end side. An operation panel 11 is provided on the right side of the door 12, a handle 13 is provided on the top of the door 12, and a heat-resistant glass window 14 is provided at the approximate center of the door 12.

  FIG. 2 is an external perspective view showing a state where the door 12 of the heating cooker 1 is opened. A heating chamber 20 having a rectangular parallelepiped shape is provided in the main body casing 10. The heating chamber 20 has an opening 20a on the front side facing the door 12, and the side surface, bottom surface and top surface of the heating chamber 20 are formed of stainless steel plates. Further, the door 12 is formed of a stainless steel plate on the side facing the heating chamber 20. A heat insulating material (not shown) is disposed around the heating chamber 20 and inside the door 12 to insulate the inside of the heating chamber 20 from the outside.

  Further, a stainless steel tray 21 is placed on the bottom surface of the heating chamber 20, and a stainless steel wire rack 22 is placed on the tray 21 for placing an object to be heated. In addition, in the state which opened the door 12, the upper surface side of the door 12 becomes substantially horizontal, and when it takes out to-be-heated material, it can once put on the upper surface of the door 12.

  Further, a water tank storage unit 100 for storing the water tank 30 is provided on the left side of the heating chamber 20 of the main body casing 10. The water tank 30 is inserted into the water tank storage unit 100 from the front side toward the rear side.

  FIG. 3 is a schematic configuration diagram showing the basic configuration of the heating cooker 1. As shown in FIG. 3, the heating cooker 1 includes a heating chamber 20, a water tank 30 that stores water for steam, a steam generator 40 that evaporates water supplied from the water tank 30, and the steam generator 40. A steam temperature raising device 50 for heating the steam from the steam generator, and a control device 80 for controlling the steam generating device 40, the steam temperature raising device 50, and the like.

  A grid-like rack 22 is placed on a tray 21 placed in the heating chamber 20, and an object to be heated 90 is placed at the approximate center of the rack 22.

  Further, the connecting portion 30 a provided on the lower side of the water tank 30 is connected to a funnel-shaped receiving port 31 a provided in the joint portion 31. The suction side of the pump 35 is connected to the other end of the first water supply pipe 32 extending upward from the joint portion 31, and one end of the second water supply pipe 33 is connected to the discharge side of the pump 35.

  The second water supply pipe 33 has an L shape that is bent substantially horizontally from a vertically arranged portion, and an auxiliary tank 39 is connected to the other end of the second water supply pipe 33. One end of the third water supply pipe 34 is connected to the lower end of the auxiliary tank 39, and the other end of the third water supply pipe 34 is connected to the lower end of the steam generator 40. In addition, one end of the drain valve 70 is connected to the lower end of the steam generator 40 to which the third water supply pipe 34 is connected. One end of the drain pipe 71 is connected to the other end of the drain valve 70, and the other end of the drain pipe 71 is connected to the upper side of the water tank 30. A filter 72 is disposed below the other end of the drain pipe 71 of the water tank 30. The upper part of the auxiliary tank 39 communicates with the atmosphere via the exhaust duct 65.

  When the water tank 30 is connected, the water in the water tank 30 rises into the air release pipe 37 until the water tank 30 reaches the same water level.

  In addition, the steam generator 40 includes a pot 41 having the other end of the third water supply pipe 34 connected to the lower side, a heater portion 42 disposed near the bottom surface in the pot 41, and the heater portion 42 in the pot 41. It has a water level sensor 43 arranged in the vicinity of the upper side, a water temperature sensor 47 arranged in the pot 41, and a steam suction ejector 44 attached to the upper side of the pot 41. And the fan casing 26 is arrange | positioned on the outer side of the suction inlet 25 provided in the side surface upper part of the heating chamber 20. As shown in FIG. The steam in the heating chamber 20 is sucked from the suction port 25 by the blower fan 28 disposed in the fan casing 26. The sucked steam is sent to the inlet side of the steam suction ejector 44 of the steam generator 40 through the first pipe 61 and the second pipe 62. The first pipe 61 is disposed substantially horizontally and has one end connected to the fan casing 26. The second pipe 62 is disposed substantially vertically, and has one end connected to the other end of the first pipe 61 and the other end connected to the inlet side of the inner nozzle 45 of the vapor suction ejector 44.

  The vapor suction ejector 44 includes an outer nozzle 46 that wraps the outside of the inner nozzle 45, and the discharge side of the inner nozzle 45 communicates with the internal space of the pot 41. The discharge side of the outer nozzle 46 of the steam suction ejector 44 is connected to one end of the third pipe 63, and the steam temperature raising device 50 is connected to the other end of the third pipe 63.

  A circulation path 60 is formed by the fan casing 26, the first pipe 61, the second pipe 62, the steam suction ejector 44, the third pipe 63 and the steam temperature raising device 50. Further, one end of the discharge passage 64 is connected to the exhaust port 27 provided on the lower side of the side surface of the heating chamber 20, and the other end of the discharge passage 64 is connected to one end of the exhaust duct 65. An exhaust port 66 is provided at the other end of the exhaust duct 65. A radiator 69 is externally fitted to the discharge passage 64 on the exhaust duct 65 side. The discharge passage 64 and the exhaust duct 65 constitute an exhaust passage.

  A connection portion between the first pipe 61 and the second pipe 62 forming the circulation path 60 is connected to the exhaust duct 65 via the discharge path 67. A damper 68 that opens and closes the discharge path 67 is disposed on the connection side of the discharge path 67 between the first and second pipes 61 and 62.

  Further, the steam temperature raising device 50 includes a dish-shaped case 51 disposed with the opening on the ceiling side and substantially in the center of the heating chamber 20, and a steam heater 52 disposed in the dish-shaped case 51. Have. The bottom surface of the dish-shaped case 51 is formed by a metal ceiling panel 54 provided on the ceiling surface of the heating chamber 20. A plurality of ceiling steam outlets 55 are formed in the ceiling panel 54. Further, the ceiling panel 54 is finished in a dark color by painting or the like on the upper and lower surfaces. Note that the ceiling panel 54 may be formed of a metal material that changes to a dark color by repeated use or a dark-colored ceramic molded product.

  Further, the steam temperature raising device 50 is connected to one ends of steam supply passages 23 (only one is shown in FIG. 3) extending on the left and right sides of the heating chamber 20. The other end of the steam supply passage 23 extends downward along both side surfaces of the heating chamber 20 and is connected to a side surface steam outlet 24 provided on both side surfaces and the lower side of the heating chamber 20.

  Next, the control block of the heating cooker 1 shown in FIG. 4 will be described.

  As shown in FIG. 4, the control device 80 includes a blower fan 28, a steam heater 52, a damper 68, a drain valve 70, a steam generation heater 42, an operation panel 11, a water level sensor 43, and a water temperature. A sensor 47 and a pump 35 are connected.

  The control device 80 includes a microcomputer, an input / output circuit, and the like, and based on detection signals from the water level sensor 43 and the water temperature sensor 47, the blower fan 28, the steam heater 52, the damper 68, the drain valve 70, and the steam generating heater 42. The operation panel 11 and the pump 35 are controlled according to a predetermined program.

  In the cooking device 1 configured as described above, a power switch (not shown) in the operation panel 11 is pressed to turn on the power, and the operation of the cooking operation is started by operating the operation panel 11. Then, the control device 80 first starts the operation of the pump 35 with the drain valve 70 closed and the discharge path 67 closed by the damper 68. Water is supplied from the water tank 30 into the pot 41 of the steam generator 40 via the first to third water supply pipes 32 to 34 by the pump 35. And if the water level sensor 43 detects that the water level in the pot 41 has reached the predetermined water level, the pump 35 is stopped to stop water supply.

  Next, the steam generating heater 42 is energized, and a predetermined amount of water accumulated in the pot 41 is heated by the steam generating heater 42.

  Next, simultaneously with energization of the steam generating heater 42 or when the temperature of the water in the pot 41 reaches a predetermined temperature (for example, 60 ° C.), the blower fan 28 is turned on and the steam heating heater of the steam heating device 50 is turned on. 52 is energized. Then, the blower fan 28 sucks air (including steam) in the heating chamber 20 from the suction port 25 and sends out air (including steam) to the circulation path 60. Since a centrifugal fan is used as the blower fan 28, a higher pressure can be generated compared to the propeller fan. Furthermore, by rotating the centrifugal fan used for the blower fan 28 at a high speed with a DC motor, the flow velocity of the circulating airflow can be extremely increased.

  Next, when the water in the pot 41 of the steam generator 40 boils, saturated steam is generated, and the generated saturated steam joins the circulating airflow passing through the circulation path 60 at the steam suction ejector 44. The steam discharged from the steam suction ejector 44 flows into the steam temperature raising device 50 through the third pipe 63 at a high speed.

  The steam that has flowed into the steam temperature raising device 50 is heated by the steam heater 52 and becomes superheated steam at approximately 300 ° C. (depending on the cooking content). A part of the superheated steam is ejected downward from the plurality of ceiling steam outlets 55 provided in the lower ceiling panel 54 in the heating chamber 20. Further, another part of the superheated steam is ejected from the side surface steam outlets 24 on both side surfaces of the heating chamber 20 through the steam supply passages 23 provided on the left and right sides of the steam temperature raising device 50.

  Here, in the heating chamber 20, convection occurs in the form of rising at the center and blowing down the outside. Then, the convection steam is sequentially sucked into the suction port 25 and repeats circulation such that it returns to the heating chamber 20 through the circulation path 60 again.

  By forming convection of superheated steam in the heating chamber 20 in this way, the superheated steam from the steam heating device 50 is sent to the ceiling steam outlet 55 while maintaining the temperature and humidity distribution in the heating chamber 20 uniform. It is possible to eject the gas from the side surface steam outlet 24 and efficiently collide with the object to be heated 90 placed on the rack 24. Then, the object to be heated 90 is heated by the collision of superheated steam. At this time, the superheated steam that has contacted the surface of the object to be heated 90 also heats the object to be heated 90 by releasing latent heat when dew condensation occurs on the surface of the object to be heated 90. As a result, a large amount of heat of the superheated steam can be uniformly and quickly applied to the entire surface of the article 90 to be heated. Therefore, it is possible to realize cooking with no unevenness and good finish. Moreover, since the inside of the heating chamber 20 filled with superheated steam is in a low oxygen concentration state of about 1%, the oxidation of the article 90 to be heated is suppressed and vitamin C and the like are not impaired.

  Further, in the heating cooking operation, when time elapses, the amount of steam in the heating chamber 20 increases, and the surplus amount of steam passes from the exhaust port 27 via the discharge passage 64 and the exhaust duct 65. And discharged from the exhaust port 66 to the outside. At this time, the steam 69 passing through the discharge passage 64 is cooled and condensed by the radiator 69 provided in the discharge passage 64, thereby preventing the steam from being discharged to the outside as it is. The water condensed in the discharge passage 64 by the radiator 69 flows down in the discharge passage 64 and is guided to the receiving tray 21, and is processed together with the water generated by cooking after the cooking.

  After the cooking is finished, the control device 80 displays a cooking end message on the operation panel 11 and further sounds a signal by a buzzer (not shown) provided on the operation panel 11. Thereby, when the user who knows the end of cooking opens the door 12, the control device 80 detects that the door 12 has been opened by a sensor (not shown), and instantly opens the damper 68 of the discharge path 67. . As a result, the first pipe 61 of the circulation path 60 communicates with the exhaust duct 65 via the discharge path 67, and the steam in the heating chamber 20 is blown by the blower fan 28 through the suction port 25, the first pipe 61, the discharge path 67 and The gas is discharged from the exhaust port 66 through the exhaust duct 65. This damper operation is the same even if the user opens the door 12 during cooking. Therefore, the user can safely remove the object to be heated 90 from the heating chamber 20 without being exposed to steam.

  FIG. 5 is a diagram showing a change in oxygen concentration in the heating chamber 20 of the cooking device and a change in water temperature in the pot 41 of the steam generator 40.

In FIG.
a1 is a fixed period from the start of cooking with superheated steam a2 is a period from the start of cooking with superheated steam until the water temperature reaches a predetermined temperature (60 ° C.) or more b1 is a water supply period Period c2 is a period from the start of water supply until the water temperature reaches a predetermined temperature (90 ° C.) or higher. D1 is a period from the start of water supply until a certain time (> water supply period) elapses. Period until the water temperature reaches the predetermined temperature (95 ° C.) or higher d3 Period after the water temperature becomes the predetermined temperature (90 ° C.) or less until a predetermined time elapses d4 is the time after the water temperature becomes the predetermined temperature (90 ° C.) or lower This is the period until the water temperature reaches a predetermined temperature (95 ° C.) or higher.

  The controller 80 stops the blower fan 28 in the period a1 or the period a2 at the start of cooking. Then, after the period a1 or the period a2, the operation of the blower fan 28 is started at a predetermined rotational speed. Then, the steam generated in the steam generating device 40 is heated by the steam heating device 50 and then supplied into the heating chamber 20 and circulates in the circulation path 60. Thereby, the air in the heating chamber 20 is gradually replaced with superheated steam, and the oxygen concentration in the heating chamber 20 gradually decreases.

  Next, when the water in the steam generator 40 decreases, the control device 80 starts the operation of the water supply pump 35 and stops the operation of the blower fan 28.

  Thereafter, the blowing fan 28 is stopped until any one of the periods b1, d1 to d4 elapses.

  Then, after the water supply to the steam generator 40 is finished and the water temperature in the pot 41 is sufficiently increased, the operation of the blower fan 28 is resumed.

  Thus, according to the heating cooker having the above-described configuration, during cooking, air is sent to the circulation path 60 by the blower fan 28, and the steam is circulated through the steam generating device 40 and the heating chamber 20, so that the steam The object to be heated is heated by steam supplied from the generator 40 to the heating chamber 20. At this time, the air in the heating chamber 20 is discharged from the exhaust port provided in the heating chamber 20 through the exhaust passage (discharge passage 64, exhaust duct 65), and the inside of the heating chamber 20 is in a low oxygen concentration state. Then, the operation of the blower fan 28 is controlled so that the oxygen concentration in the heating chamber 20 does not increase during cooking. That is, when the water temperature in the steam generator 40 is lowered by the water supply, the blower fan 28 is stopped to suppress the temperature drop in the heating chamber 20 and through the exhaust passage (the discharge passage 64, the exhaust duct 65). Thus, it is possible to prevent outside air from entering the heating chamber 20. Instead of stopping the blower fan 28, the rotational speed of the blower fan 28 may be lower than a predetermined rotational speed during cooking.

  Thereby, it is possible to prevent the oxygen concentration in the heating chamber 20 from increasing during cooking by steam, and to suppress the oxidation of the food. In particular, the oxygen concentration in the heating chamber 20 can be lowered in a short time at the start of cooking, and a high oxidation suppression effect can be obtained.

  Further, by stopping the blower fan 28 at least during the water supply period b1 of the steam generating device 40 by the control device 80, air is not circulated through the circulation path 60 when the water temperature in the steam generating device 40 is lowered. It is possible to surely prevent the temperature from falling. In addition, you may make the rotation speed of the ventilation fan 28 lower than the predetermined rotation speed during heating cooking at least in the water supply period of the steam generator 40.

  In addition, by controlling the operation of the blower fan 28 according to the water temperature in the steam generator 40 detected by the water temperature sensor 47 by the control device 80, the blower fan 28 is adjusted in accordance with the water temperature drop in the steam generator 40. Can be stopped (or rotated at a low speed).

  The steam generator 40 is stopped by the control device 80 until the water temperature in the steam generator 40 detected by the water temperature sensor from the start of water supply to the steam generator 40 is equal to or higher than a predetermined temperature. Since no air is sent to the circulation path 60 when the water temperature in the inside is lowered, the temperature drop in the heating chamber 20 can be reliably prevented. Alternatively, the controller 80 detects the rotation speed of the blower fan 28 from the start of water supply until the water temperature sensor 47 detects the water temperature in the steam generator 40 until the water temperature in the steam generator 40 reaches a predetermined temperature or higher. It may be lower than the number.

  In the said embodiment, although the heating cooker using the steam generator 40 and the steam temperature raising apparatus 50 was demonstrated, a heating cooker is not restricted to this, The steam from a steam generator is supplied to a heating chamber, and is cooked. The present invention may be applied to a heating cooker.

FIG. 1 is an external perspective view of a cooking device according to an embodiment of the present invention. FIG. 2 is an external perspective view of the heating cooker with the door opened. FIG. 3 is a schematic configuration diagram showing the configuration of the cooking device. FIG. 4 is a control block diagram of the cooking device. FIG. 5 is a diagram showing changes in oxygen concentration in the heating chamber of the heating cooker and changes in water temperature in the steam generator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Heating cooker 10 ... Main body casing 11 ... Operation panel 12 ... Door 13 ... Handle 14 ... Window 20 ... Heating chamber 21 ... Sauce tray 22 ... Rack 23 ... Steam supply passage 24 ... Side surface steam outlet 25 ... Suction port 26 ... Fan Casing 27 ... Exhaust port 28 ... Blower fan 30 ... Water tank 31 ... Joint portion 32 ... First water pipe 33 ... Second water pipe 34 ... Third water pipe 35 ... Pump 39 ... Auxiliary tank 40 ... Steam generator 41 ... Pot DESCRIPTION OF SYMBOLS 42 ... Steam generating heater 43 ... Water level sensor 44 ... Steam suction ejector 45 ... Inner nozzle 46 ... Outer nozzle 47 ... Water temperature sensor 50 ... Steam temperature rising device 51 ... Dish-shaped case 52 ... Steam heater 60 ... Circulation path 61 ... 1st Pipe 62 ... Second pipe 63 ... Third pipe 64 ... Release passage 65 ... Exhaust duct 66 ... Exhaust port 6 DESCRIPTION OF SYMBOLS 7 ... Discharge route 68 ... Damper 69 ... Radiator 70 ... Drain valve 71 ... Drain pipe 80 ... Control apparatus 100 ... Storage part for water tanks

Claims (4)

A steam generator for generating steam;
A heating chamber for heating an object to be heated by steam supplied from the steam generator;
A circulation path for circulating steam through the steam generator and the heating chamber;
A blower fan that sends wind to the circulation path;
An exhaust passage having one end connected to an exhaust port provided in the heating chamber and the other end opened to the atmosphere;
A control device for controlling the rotational speed of the blower fan,
The said control apparatus controls the driving | operation of the said ventilation fan so that the oxygen concentration in the said heating chamber may not rise during the cooking by the steam supplied from the said steam generator. The heating cooker according to claim 1, wherein
The control device stops the blower fan or sets the rotational speed of the blower fan to be lower than a predetermined rotational speed during the cooking, at least during a water supply period of the steam generator during the cooking. A heating cooker. The heating cooker according to claim 1, wherein
A water temperature sensor for detecting the water temperature in the steam generator,
The control device controls the operation of the blower fan in accordance with the water temperature in the steam generator detected by the water temperature sensor so that the oxygen concentration in the heating chamber does not increase during the cooking. A heating cooker. The cooking device according to claim 3,
The control device stops the blower fan or blows the air until the water temperature in the steam generator detected by the water temperature sensor is equal to or higher than a predetermined temperature from the start of water supply to the steam generator during cooking. A heating cooker characterized in that the rotational speed of the fan is lower than the predetermined rotational speed during the cooking.

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