JP6013086B2 - Cooker - Google Patents

Description

  The present invention relates to a cooking device, and more particularly to a cooking device that heats an object to be heated by microwaves.

  2. Description of the Related Art Conventionally, as a cooking device, there is a cooking device that cooks food in a heating chamber by using a microwave (see, for example, JP 2010-133627 A (Patent Document 1)). The heating cooker also has an oven cooking function by heater heating, and a metal tray is mounted in the heating chamber during oven cooking.

  In the heating cooker, when cooking by microwaves, when it is detected that a tray is mounted by a piezoelectric sensor incorporated in a tray holding part in the heating chamber, cooking by microwaves is not performed. . Thereby, it is prevented that a spark is generated between the metal tray erroneously mounted in the heating chamber and the wall surface of the heating chamber by the microwave.

  However, in the above-mentioned cooking device, the piezoelectric sensor for detecting the mounting of the tray is disposed in the heating chamber, and the piezoelectric sensor is damaged or deteriorated due to high heat during cooking in the oven. There is a problem that detection cannot be performed.

JP 2010-133627 A

  Then, the subject of this invention is providing the heating cooker which can perform reliable tray detection with a simple structure.

In order to solve the above problems, the heating cooker of the present invention is:
A heating chamber in which an object to be heated is accommodated;
A microwave generator for generating microwaves for heating the object to be heated in the heating chamber;
A tray detachably disposed in the heating chamber;
An illuminating unit disposed on a side surface or top surface of the heating chamber to illuminate the heating chamber;
A light receiving unit disposed at a position where illumination light from the illumination unit is blocked by the tray mounted in the heating chamber;
A tray determination unit for determining whether or not the tray is mounted in the heating chamber based on a light reception signal from the light receiving unit ;
A failure determination unit that determines whether or not the illumination unit is in failure based on a light reception signal from the light reception unit;
A door opening / closing detector for detecting opening / closing of the door attached to the opening of the heating chamber so as to be freely opened and closed;
When the door opening / closing detection unit detects that the door has been opened from an operation stop state in which the illumination unit is turned off, an illumination control unit that turns on the illumination unit;
With
The failure determination unit detects that the door opening / closing detection unit has opened the door, and sets the level of a light reception signal from the light receiving unit in a state where the lighting control unit lights the lighting unit. When the failure detection threshold is not more than the threshold value, it is determined that the illumination unit is in failure .

According to the above configuration, when the tray is not installed in the heating chamber, the illumination light from the illumination unit is received by the light receiving unit without being blocked, while when the tray is installed in the heating chamber, Illumination light from the illumination unit is blocked by the tray and is not received by the light receiving unit. Accordingly, when the illumination light from the illumination unit is received by the light receiving unit, the tray determination unit determines that the tray is not installed in the heating chamber based on the light reception signal, while the illumination light from the illumination unit is not received. When no light is received by the light receiving unit, it can be determined that the tray is mounted in the heating chamber based on the light reception signal. The illumination unit and the light receiving unit can be arranged outside the heating chamber, and the illumination light from the illumination unit is irradiated into the heating chamber through the window, or the light in the heating chamber is received by the light receiving unit through the window. Therefore, the illumination unit and the light receiving unit are not exposed to high heat. Therefore, highly reliable tray detection can be performed with a simple configuration without using a piezoelectric sensor or the like.
Also, the failure determination unit determines whether or not the illumination unit is faulty based on the light reception signal from the light reception unit. For example, the illumination light is received by the light reception unit when the illumination unit should be turned on by opening the door. If not, it is possible to determine that the illumination unit is out of order.
In addition, when the door is opened from the operation stop state where the illumination unit is turned off, the failure determination unit detects that the door opening / closing detection unit has opened the door, and the illumination control unit turns on the illumination unit. Thus, when the level of the light reception signal from the light receiving unit is equal to or lower than a preset failure detection threshold, it is determined that the lighting unit is faulty. Therefore, it is possible to determine the failure of the lighting unit by opening the door each time cooking is performed. . In the operation stop state in which the illumination unit is turned off, the tray is not usually mounted. Therefore, the illumination light from the illumination unit is not blocked by the tray. Illumination light is received by the light receiving unit.
Moreover, the heating cooker of this invention is
A heating chamber in which an object to be heated is accommodated;
A microwave generator for generating microwaves for heating the object to be heated in the heating chamber;
A tray detachably disposed in the heating chamber;
An illuminating unit disposed on a side surface or top surface of the heating chamber to illuminate the heating chamber;
A light receiving unit disposed at a position where illumination light from the illumination unit is blocked by the tray mounted in the heating chamber;
A tray determination unit for determining whether or not the tray is mounted in the heating chamber based on a light reception signal from the light receiving unit;
A flame occurrence determination unit that determines that a flame has occurred in the heating chamber when a level of a light reception signal from the light reception unit is equal to or higher than a preset flame detection threshold;
With
The flame detection threshold is higher than a level of a light reception signal representing illumination light from the illumination unit received by the light reception unit, and a light reception signal representing discharge light generated in the heating chamber received by the light reception unit. It is characterized by being set lower than the level.
According to the above configuration, when the tray is not installed in the heating chamber, the illumination light from the illumination unit is received by the light receiving unit without being blocked, while when the tray is installed in the heating chamber, Illumination light from the illumination unit is blocked by the tray and is not received by the light receiving unit. Accordingly, when the illumination light from the illumination unit is received by the light receiving unit, the tray determination unit determines that the tray is not installed in the heating chamber based on the light reception signal, while the illumination light from the illumination unit is not received. When no light is received by the light receiving unit, it can be determined that the tray is mounted in the heating chamber based on the light reception signal. The illumination unit and the light receiving unit can be arranged outside the heating chamber, and the illumination light from the illumination unit is irradiated into the heating chamber through the window, or the light in the heating chamber is received by the light receiving unit through the window. Therefore, the illumination unit and the light receiving unit are not exposed to high heat. Therefore, highly reliable tray detection can be performed with a simple configuration without using a piezoelectric sensor or the like.
Further, the flame detection threshold is higher than the level of the light reception signal representing the illumination light from the illumination unit received by the light receiving unit, and more than the level of the light reception signal representing the discharge light generated in the heating chamber received by the light reception unit. Since it is set low, the flame occurrence determination unit can accurately determine whether or not flame has occurred in the heating chamber based on the flame detection threshold.

Moreover, in the heating cooker of one embodiment,
When the tray determination unit determines that the tray is mounted in the heating chamber during cooking by the microwave, the microwave generation unit is controlled so as not to generate the microwave from the microwave generation unit. A microwave control unit was provided.

  If a metal tray is mounted in the heating chamber during cooking by microwaves, a discharge is generated between the tray and the wall surface of the heating chamber, which is dangerous. According to the embodiment, when the tray determination unit determines that the tray is mounted in the heating chamber, the microwave control unit controls the microwave generation unit so as not to generate the microwave from the microwave generation unit. So safety can be improved.

Moreover, in the heating cooker of one embodiment,
The light receiving unit is disposed on the rear side of the heating chamber.

  According to the above-described embodiment, by disposing the light receiving unit on the rear side of the heating chamber, the influence of external light entering the heating chamber from the door window can be reduced, and accurate tray detection can be performed.

Moreover, in the heating cooker of one embodiment,
A discharge determination unit is provided that determines that a discharge has occurred in the heating chamber when the level of a light reception signal from the light reception unit is equal to or higher than a preset discharge detection threshold during cooking by microwaves.

  According to the above embodiment, when the level of the light reception signal from the light receiving unit is equal to or higher than a preset discharge detection threshold during cooking by microwaves, the discharge determination unit determines that discharge is occurring in the heating chamber. Thus, when the discharge is detected, the microwave heating can be stopped, and the safety is further improved. Here, the level of the light reception signal from the light receiving unit that has received the discharge light is extremely higher than the level of the light reception signal from the light reception unit that has received the illumination light from the illumination unit, and therefore, compared with the threshold value for detecting the illumination light. By setting the discharge detection threshold to a high value, it is easy to distinguish between illumination light and discharge light.

Moreover, in the heating cooker of one embodiment,
A failure determination unit for determining whether or not the illumination unit is defective based on a light reception signal from the light reception unit is provided.

  According to the above embodiment, the failure determination unit determines whether or not the illumination unit is out of order based on the light reception signal from the light reception unit. For example, when the door is opened and the illumination unit should be turned on, the light reception unit If no illumination light is received, it can be determined that the illumination unit has failed.

Moreover, in the heating cooker of one embodiment,
When a level of a light reception signal from the light receiving unit is equal to or higher than a preset flame detection threshold, a flame occurrence determination unit that determines that a flame has occurred in the heating chamber,
The flame detection threshold is higher than a level of a light reception signal representing illumination light from the illumination unit received by the light reception unit, and a light reception signal representing discharge light generated in the heating chamber received by the light reception unit. It is set lower than the level.

  According to the embodiment, the flame detection threshold is higher than the level of the light reception signal representing the illumination light from the illumination unit received by the light reception unit, and the light reception represents the discharge light generated in the heating chamber received by the light reception unit. Since it is set lower than the signal level, the flame occurrence determination unit can accurately determine whether or not flame has occurred in the heating chamber based on the flame detection threshold.

  As is clear from the above, according to the present invention, it is possible to realize a cooking device capable of easily detecting trays with high reliability with a simple configuration.

FIG. 1 is a front perspective view of a heating cooker according to an embodiment of the present invention. FIG. 2 is a schematic diagram of a longitudinal section viewed from the front of the heating cooker. FIG. 3 is a schematic diagram of a longitudinal section viewed from the right side of the cooking device. FIG. 4 is a control block diagram of the cooking device. FIG. 5 is a schematic diagram of a longitudinal section of the illumination unit of the cooking device. FIG. 6 is a front view of the cooking device with the door open. FIG. 7 is a front view of the cooking device in a state where the tray is mounted on the upper stage. FIG. 8 is a front view of the heating cooker with a tray mounted in the middle stage.

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

  FIG. 1: has shown the front perspective view of the heating cooker provided with the display apparatus of one Embodiment of this invention.

  As shown in FIG. 1, the cooking device of this embodiment has a door 2 attached to the front surface of a rectangular parallelepiped casing 1 that rotates about the lower end side. A handle 3 is attached to the upper portion of the door 2 and a heat-resistant glass 4 is attached to the approximate center of the door 2. An operation panel 5 is provided on the right side of the door 2. The operation panel 5 includes a color liquid crystal display unit 6 and a button group 7. An exhaust duct cover 8 is provided on the upper side of the casing 1 and on the right rear side. Further, a dew receptacle 9 is detachably attached below the door 2 of the casing 1.

  Moreover, FIG. 2 shows the schematic diagram of the longitudinal cross section seen from the front of the said heating cooker, and FIG. 3 has shown the schematic diagram of the longitudinal cross section seen from the right side of this heating cooker. In FIG. 2, 55 is a light receiving unit, and in FIG. 3, 45 is an illumination unit.

  As shown in FIGS. 2 and 3, a water supply tank 11 detachably inserted from the front side is disposed on the right side of the heating chamber 10, and a steam generator 12 is disposed on the rear side of the water supply tank 11. Yes. The steam generator 12 is connected to the water supply tank 11 and generates steam by heating a heater (not shown). One end of the steam supply passage 13 is connected to the steam generator 12, and the other end of the steam supply passage 13 is connected to the circulation unit 14.

  Water supplied from the water supply tank 11 is heated by the steam generator 12 to generate saturated water vapor. The saturated steam generated by the steam generator 12 is supplied from the steam supply port 13 a to the downstream side of the suction port 28 via the steam supply passage 13. The suction port 28 is provided at the center of the right side wall of the heating chamber 10.

  The steam supply port 13 a of the steam supply passage 13 is disposed in the vicinity of the suction port 28. A circulation fan 18 is disposed in the circulation unit 14 so as to face the suction port 28. The circulation fan 18 is driven by a circulation fan motor 19.

  A steam duct 100 bent in an L shape is attached so as to cover the upper surface and the left side surface of the heating chamber 10. The steam duct 100 includes a first duct portion 110 fixed to the upper surface side of the heating chamber 10, a bent portion 120 bent from the left side to the lower side of the first duct portion 110, and a left side surface side of the heating chamber 10. A second duct portion 130 that is fixed and is continuous with the first duct portion 110 via the bent portion 120 is provided.

  A superheated steam generating heater 20 such as a sheathed heater is accommodated in the first duct portion 110 of the steam duct 100. A superheated steam generator 21 is configured by the first duct portion 110 of the steam duct 100 and the superheated steam generator heater 20. Note that the superheated steam generator may be provided separately from the steam duct.

  The right side of the first duct portion 110 of the steam duct 100 communicates with a steam supply port 14 a provided in the upper part of the circulation unit 14. A plurality of first steam outlets 24 are provided on the top surface of the heating chamber 10, and the first duct portion 110 of the steam duct 100 communicates with the inside of the heating chamber 10 via the first steam outlet 24. ing. On the other hand, the second duct portion 130 of the steam duct 100 communicates with the inside of the heating chamber 10 via a plurality of second steam outlets 25 provided on the left side surface of the heating chamber 10. Further, on the left wall surface and the right wall surface in the heating chamber 10, locking portions 39a, 39b, and 39c for locking both ends of the tray 140 are provided in three stages in the vertical direction.

  A gap between the heating chamber 10 and the steam duct 100 is sealed with a heat resistant resin or the like. The heating chamber 10 and the steam duct 100 are covered with a heat insulating material except for the front opening of the heating chamber 10.

  The circulation path of the heat medium is formed by the circulation unit 14, the steam duct 100, the heating chamber 10, and the connecting member that connects them. Then, saturated steam generated by the steam generator 12 is supplied to the boundary portion of the circulation unit 14 in the circulation path with the heating chamber 10.

  Here, the heating medium may be heated air, may be heated air containing water vapor, may be air containing superheated steam heated to 100 ° C. or higher, and The main component may be superheated steam heated to 100 ° C. or higher.

  In addition, a magnetron 80 as an example of a microwave generation unit is disposed below the heating chamber 10. The microwave generated in the magnetron 80 is guided to the lower center of the heating chamber 10 by a waveguide (not shown), and radiated upward in the heating chamber 10 while being stirred by the rotating antenna 81 to be heated. The object 160 is heated. In the case of cooking by microwaves, the object to be heated 160 is placed on the bottom of the heating chamber 10.

  An air supply port (not shown) is provided on the front side of the suction port 28 on the right side wall of the heating chamber 10, and a first exhaust port 36 is provided on the rear surface side of the suction port 28. The air supply port is arranged in the vicinity of the door 2, and outside air blown from the air supply port flows into the heating chamber 10 along the door 2. A second exhaust port 37 having an opening area smaller than that of the first exhaust port 36 is provided on the lower right side of the rear side wall surface of the heating chamber 10.

  A circulation fan motor 19 for driving the circulation fan 18 is attached to the circulation unit 14 disposed on the right side surface of the heating chamber 10. Steam and air in the heating chamber 10 are sucked from the suction port 28 by the circulation fan 18 and blown out from the first and second steam outlets 24 and 25 into the heating chamber 10 through the steam duct 100. Further, an in-compartment temperature sensor 29 (shown in FIG. 4) for detecting the temperature of the heat medium (air containing steam) in the heating chamber 10 is disposed in the vicinity of the suction port 28 of the circulation unit 14.

  The object to be heated 160 in the heating chamber 10 is heated by the radiant heat of the superheated steam generation heater 20 disposed in the first duct portion 110 of the steam duct 100. Further, the heat medium (air containing steam) passing through the steam duct 100 is heated by the superheated steam generation heater 20, and the heated heat medium is blown out from the first and second steam outlets 24 and 25. Thereby, the heat medium in the heating chamber 10 is maintained at a predetermined temperature. In addition, the steam supplied to the heating chamber 10 can be further heated by the superheated steam generation heater 20 to generate superheated steam at 100 ° C. or higher.

  A cooling fan part 22 and an electrical component part 17 are arranged on the lower side in the casing 1. A blower duct 31 is disposed on the right side of the heating chamber 10 in the casing 1. A dilution fan 30 and a dilution fan motor 38 that drives the dilution fan 30 are housed in the air duct 31. The cooling fan unit 22 includes a cooling fan (not shown) and a cooling fan motor 16 (shown in FIG. 4) that drives the cooling fan.

  The electrical component part 17 includes a drive circuit that drives each part of the cooking device, a control circuit that controls the drive circuit, and the like. Further, the cooling fan takes outside air into the casing 1 and cools the electrical component part 17 and the magnetron 80 that generate heat. Further, a part of the outside air flowing into the casing 1 by the cooling fan is guided into the air duct 31 by the dilution fan 30 and the remaining outside air is an opening (not shown) formed in the back surface of the casing 1 or the like. Is discharged to the outside.

  As shown in FIG. 3, the 1st exhaust duct 34 connected to the right side wall of the heating chamber 10 from the 1st exhaust port 36 via the exhaust damper (not shown) is arrange | positioned. An exhaust duct cover 8 is detachably attached to the upper end of the first exhaust duct 34.

  A suction port (not shown) for sucking outside air through a suction duct 27 is provided on the back side of the first exhaust duct 34. The exhaust damper is controlled so that either one of the suction port or the first exhaust port 36 is alternatively selected and connected to the first exhaust duct 34. The exhaust damper is driven by an exhaust damper motor 60 (shown in FIG. 4).

  The first exhaust duct 34 is connected to the exhaust duct cover 8 with its flow path area enlarged toward the upper side. The exhaust duct cover 8 has an exhaust port 8a having an open end opened forward.

  On the other hand, the lower end of the second exhaust duct 35 is connected to the second exhaust port 37, and the upper end of the second exhaust duct 35 is connected to the lower side of the first exhaust duct 34.

  The second exhaust duct 35 has a smaller flow area than the first exhaust duct 34. The exhaust from the second exhaust port 37 flows into the first exhaust duct 34 via the second exhaust duct 35 and is discharged to the outside from the exhaust port 8 a of the exhaust duct cover 8.

  Thus, an ejector is formed in the first exhaust duct 34, and the dilution fan 30 generates an air flow from the first exhaust port 36 toward the exhaust port 8a.

  Further, one end of the air supply passage 32 is connected to the upper portion of the air duct 31, and the other end of the air supply passage 32 is connected to the air supply damper 90. The air supply passage 32 and the air supply damper 90 are part of an air supply mechanism for supplying air to the heating chamber 10 via the air supply port (not shown) by the dilution fan 30. A thawing sensor 50 is disposed near and below the air supply port of the heating chamber 10.

  FIG. 4 shows a control block diagram of the heating cooker. This cooking device includes a control device 200 including a microcomputer and an input / output circuit in the electrical component section 17 (shown in FIG. 2). The control device 200 includes a superheated steam generating heater 20, a circulation fan motor 19, a cooling fan motor 16, a supply damper motor 91, an exhaust damper motor 60, a rotary antenna motor 82, an illumination lamp 42, a light receiving sensor 52, A door opening / closing sensor 51, an operation panel 5, an internal temperature sensor 29, a thawing sensor 50, a water supply pump 70, a steam generator 12, and a magnetron 80 are connected as an example of a door opening / closing detection unit. Based on the signals from the operation panel 5 and the detection signals from the internal temperature sensor 29, the thawing sensor 50, the light receiving sensor 52, and the door opening / closing sensor 51, the control device 200 performs the superheated steam generation heater 20, the circulation fan motor 19, It controls the cooling fan motor 16, the air supply damper motor 91, the exhaust damper motor 60, the rotary antenna motor 82, the operation panel 5, the water supply pump 70, the steam generator 12, the magnetron 80, the illumination lamp 42, and the like.

  In this embodiment, a light bulb is used as the illumination lamp 42 and a light sensor (CdS) is used as the light receiving sensor 52. However, the present invention is not limited to this, and an LED (Light Emitting Diode) or the like may be used as the illumination lamp. A photodiode or the like may be used for the light receiving sensor.

  The control device 200 generates a discharge in the tray 10 for determining whether or not the tray 140 is mounted in the heating chamber 10, the microwave controller 200 b for controlling the magnetron 80, and the heating chamber 10. A discharge determination unit 200c that determines whether the illumination unit 45 is faulty, a failure determination unit 200d that determines whether the illumination unit 45 (shown in FIG. 6) is faulty, an illumination control unit 200e that controls the illumination unit 45, It has a flame occurrence determination unit 200f that determines whether or not a flame has occurred in the heating chamber 10, and a heating cooking control unit 200g.

  In the heating cooker having the above-described configuration, when cooking is performed using microwaves, the microwave generated by the magnetron 80 by the cooking control unit 200e is transmitted to the lower part of the heating chamber 10 by a waveguide (not shown). The object to be heated 160 is heated by being radiated upward in the heating chamber 10 while being stirred by the rotating antenna 81 guided to the center and driven by the rotating antenna motor 82.

  In addition, when cooking with superheated steam, a tray 140 is mounted in the heating chamber 10 as shown in FIGS. The tray 140 is mounted on the upper stage by locking both ends of the tray 140 with the locking part 39a, and the tray 140 is mounted on the middle stage by locking both ends of the tray 140 with the locking part 39b. Then, the heating cooking controller 200e turns on the superheated steam generating heater 20 shown in FIG. 2 and rotationally drives the circulation fan 18. Thus, the saturated steam supplied from the steam generator 12 to the upstream side in the vicinity of the steam suction port 15 of the circulation unit 14 enters the steam suction port 15 into the circulation unit 14 which is in a negative pressure due to the rotation of the circulation fan 18. And is blown out from the steam supply port 22 into the superheated steam generator 21. And it is heated by the superheated steam production | generation heater 20 of the superheated steam production | generation apparatus 21, and becomes superheated steam. A part of this superheated steam blows downward into the heating chamber 10 from a plurality of first steam outlets 24 provided on the top surface of the lower heating chamber 10. Further, another part of the superheated steam is blown into the heating chamber 10 from the second steam outlet 25 of the heating chamber 10 through the steam duct 100.

  Then, the superheated steam supplied into the heating chamber 10 heats the object 160 to be heated mounted on the net 150 (shown in FIG. 2) on the tray 140, and then the circulation unit 14 is placed on the right wall surface of the heating chamber 10. The air is sucked into the circulation unit 14 from a suction port 28 formed to face the steam suction port 15. Then, the circulation of returning to the heating chamber 10 through the circulation path again is repeated.

  On the other hand, when performing the operation of steaming or warming the object 160 to be heated by the non-superheated steam, the heating cooking controller 200e turns off the superheated steam generation heater 20 and stops the circulation fan 18. Then, since the circulation fan 18 is stopped, the circulation air flow is not generated in the circulation path, and the saturated steam supplied from the steam generator 12 to the upstream side in the vicinity of the steam suction port 15 of the circulation unit 14 is It is not forcibly sucked into the circulation unit 14. Thereby, the to-be-heated material 160 is steamed or warmed by the saturated water vapor | steam which flows naturally in the heating chamber 10 with vapor pressure.

  FIG. 5 is a schematic diagram of a longitudinal section of the illumination unit 45 of the cooking device. As shown in FIG. 5, the upper part of the heating chamber 10, the first duct unit 110 of the steam duct 100, and the front panel 26. A mounting plate 41 is disposed between the upper portion of the two. An illumination lamp 42 is fixed to the mounting plate 41.

  A plurality of punching holes 43, 43,... Facing the illumination lamp 42 are provided on the upper wall of the heating chamber 10. Illumination light emitted from the illumination lamp 42 enters the heating chamber 10 through a plurality of punching holes 43, 43,. Moreover, the glass plate 44 is arrange | positioned on punching hole 43,43, ... so that the vapor | steam etc. in the heating chamber 10 may not leak out of the heating chamber 10 from punching hole 43,43, .... The punching holes 43, 43,... And the glass plate 44 form an illumination window.

  The mounting plate 41, the illumination lamp 42, the plurality of punching holes 43, 43,... And the glass plate 44 constitute an illumination unit 45 (shown in FIG. 6).

  FIG. 6 shows a front view of the heating cooker with the door 2 opened, and the same reference numerals are given to the same components as those in FIG. In FIG. 6, 45 is an illumination part, 55 is a light-receiving part.

  As shown in FIG. 6, a plurality of punching holes 53, 53,... Are provided on the rear surface and lower left side of the heating chamber 10, and a glass plate (not shown) that covers the punching holes 53, 53,. doing. These punching holes 53, 53,... And a glass plate form a light receiving window.

  A light receiving sensor 52 (shown in FIG. 4) is attached to the outside of the back surface of the heating chamber 10 via an attachment plate (not shown) so as to face the light receiving window.

  The mounting plate, the light receiving sensor 52, the punching holes 53, 53,...

  In the state of FIG. 6 in which the tray 140 is not mounted, when the door 2 is closed and cooking by microwaves is started, the heating chamber 10 is illuminated from the illumination lamp 42 of the illumination unit 45 through the illumination window. At this time, the illumination light is detected by the light receiving sensor 52 of the light receiving unit 55.

  7 shows a front view of the cooking device with the tray 140 attached to the upper stage, and FIG. 8 shows a front view of the cooking device with the tray 140 attached to the middle stage. Thus, in a state where the tray 140 is mounted in the heating chamber 10, the illumination light from the illumination unit 45 is blocked by the tray 140 and is not received by the light receiving unit 55.

  In the cooking device having the above configuration, as shown in FIG. 6, when the tray 140 is not mounted in the heating chamber 10, the illumination light from the illumination unit 45 is received by the light receiving unit 55 without being blocked. On the other hand, as shown in FIGS. 7 and 8, when the tray 140 is mounted in the heating chamber 10, the illumination light from the illumination unit 45 is blocked by the tray 140 and is not received by the light receiving unit 55. Thereby, when the illumination light from the illumination unit 45 is received by the light receiving unit 55, the tray determination unit 200a determines that the tray 140 is not mounted in the heating chamber 10 based on the light reception signal from the illumination unit 45. On the other hand, when the illumination light from the illumination unit 45 is not received by the light receiving unit 55, it is determined that the tray 140 is mounted in the heating chamber 10 based on the light reception signal from the illumination unit 45. The illuminating unit 45 and the light receiving unit 55 are disposed outside the heating chamber 10, and irradiate the illumination light from the illuminating unit 45 into the heating chamber 10 through the illumination window, and also transmit the light in the heating chamber 10 to the light receiving window. Therefore, the illumination unit 45 and the light receiving unit 55 are not exposed to high heat. Therefore, the tray 140 with high reliability can be detected with a simple configuration without using a piezoelectric sensor or the like.

  Further, when a metal tray 140 is mounted in the heating chamber 10 during cooking by microwaves, a discharge is generated between the tray 140 and the wall surface of the heating chamber 10, which is dangerous. According to the cooking device of the above embodiment, when the tray determination unit 200a determines that the tray 140 is mounted in the heating chamber 10, the microwave control unit 200b does not generate a microwave from the magnetron 80. Since the magnetron 80 is controlled, safety can be improved.

  Further, by arranging the light receiving portion 55 on the rear side of the heating chamber 10, the influence of external light entering the heating chamber 10 from the heat-resistant glass 4 of the door 2 can be reduced, and the tray 140 can be detected accurately.

  In addition, when the level of the light reception signal from the light receiving unit 55 is equal to or higher than a preset discharge detection threshold during cooking by microwaves, the discharge determination unit 200c determines that discharge has occurred in the heating chamber 10. Thus, it becomes possible to stop the microwave heating when the discharge is detected, and the safety is further improved. Here, since the level of the light reception signal from the light receiving unit 55 that has received the discharge light is extremely higher than the level of the light reception signal from the light reception unit 55 that has received the illumination light from the illumination unit 45, a threshold value for detecting the illumination light. By setting the discharge detection threshold value to a higher value than the above, it is easy to distinguish between illumination light and discharge light.

  Moreover, since the failure determination unit 200d determines whether or not the illumination unit 45 is malfunctioning based on the light reception signal from the light reception unit 55, when the door 2 is opened and the illumination unit 45 should be turned on, the light reception unit When the illumination light is not received at 55, it is possible to determine that the illumination unit 45 is out of order.

  Further, when the door 2 is opened from the operation stop state in which the illumination unit 45 is turned off, the failure determination unit 200d detects that the door 2 is opened by the door open / close sensor 51, and the illumination control unit 200e performs illumination. When the level of the light reception signal from the light receiving unit 55 is equal to or lower than a preset failure detection threshold in a state where the unit 45 is turned on, the lighting unit 45 is determined to be faulty. The failure determination of the illumination part 45 can be performed by opening. In the operation stop state in which the illumination unit 45 is turned off, it is normal that the tray is not mounted. Therefore, the illumination light from the illumination unit 45 is not blocked by the tray 140. Illumination light from the unit 45 is received by the light receiving unit 55.

  Further, it is higher than the level of the received light signal representing the illumination light from the illumination unit 45 received by the light receiving unit 55 and higher than the level of the received light signal representing the discharge light generated in the heating chamber 10 received by the light receiving unit 55. The flame generation determination unit 200f determines whether or not a flame has occurred in the heating chamber 10 based on the flame detection threshold set to be lower, thereby determining whether or not the tray 140 is present, the generation of discharge light, and the illumination unit 45. In addition to determining a failure, it is possible to accurately determine the flame generated in the heating chamber 10.

  In this case, the flame occurrence determination unit 200f determines that a flame has occurred when the level of the light reception signal of the light receiving unit 55 is higher than the flame detection threshold and lower than the discharge detection threshold.

  Moreover, although the microwave oven using superheated steam was demonstrated as a heating cooker of this invention, there exist a microwave oven which does not use superheated steam, a microwave oven which does not use water vapor, etc.

  In the cooking device of the present invention, healthy cooking can be performed by using superheated steam or saturated steam in a microwave oven or the like. For example, in the cooking device of the present invention, superheated steam or saturated steam having a temperature of 100 ° C. or higher is supplied to the food surface, and the superheated steam or saturated steam adhered to the food surface is condensed to give a large amount of condensation latent heat to the food. So it can efficiently transfer heat to food. Moreover, when condensed water adheres to the food surface and salt and oil are dropped together with condensed water, salt and oil in the food can be reduced. Further, the heating chamber is filled with superheated steam or saturated steam to be in a low oxygen state, thereby enabling cooking while suppressing food oxidation. Here, the low oxygen state refers to a state where the volume% of oxygen is 10% or less (for example, 0.5 to 3%) in the heating chamber.

  Although specific embodiments of the present invention have been described, the present invention is not limited to the above embodiments, and various modifications can be made within the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Casing 2 ... Door 3 ... Handle 4 ... Heat-resistant glass 5 ... Operation panel 6 ... Color liquid crystal display part 7 ... Button group 8 ... Exhaust duct cover 9 ... Dew receptacle 10 ... Heating chamber 11 ... Water tank 12 ... Steam generator DESCRIPTION OF SYMBOLS 13 ... Steam supply path 14 ... Circulation unit 14a ... Steam supply port 15 ... Steam inlet 16 ... Motor for cooling fan 17 ... Electrical component part 18 ... Circulation fan 19 ... Fan motor 20 ... Superheated steam generation heater 21 ... Superheated steam generation device DESCRIPTION OF SYMBOLS 22 ... Cooling fan part 24 ... 1st steam blower outlet 25 ... 2nd steam blower outlet 26 ... Front panel 27 ... Suction duct 28 ... Suction inlet 29 ... Inside temperature sensor 30 ... Dilution fan 31 ... Blower duct 32 ... Air supply passage 34 ... 1st exhaust duct 35 ... 2nd exhaust duct 36 ... 1st exhaust port 37 ... 2nd exhaust port 38 ... Motor for dilution fans 39a, 39b, 39c ... Locking part DESCRIPTION OF SYMBOLS 41 ... Mounting plate 42 ... Illuminating lamp 43 ... Punching hole 44 ... Glass plate 45 ... Illumination part 50 ... Defrosting sensor 51 ... Door open / close sensor 52 ... Light receiving sensor 53, 53, ... Punching hole 54 ... Glass plate 55 ... Light receiving part 60 DESCRIPTION OF SYMBOLS ... Motor for exhaust damper 70 ... Water pump 80 ... Magnetron 81 ... Rotating antenna 82 ... Motor for rotating antenna 90 ... Air supply damper 91 ... Motor for air supply damper 100 ... Steam duct 110 ... First duct part 120 ... Bending part 130 ... Second duct unit 140 ... Tray 150 ... Net 160 ... Subject to be heated 200 ... Control device 200a ... Tray judgment unit 200b ... Microwave control unit 200c ... Discharge judgment unit 200d ... Failure judgment unit 200e ... Light control unit 200f ... Flame generation judgment 200g ... Cooking control unit

Claims (7)

A heating chamber in which an object to be heated is accommodated;
A microwave generator for generating microwaves for heating the object to be heated in the heating chamber;
A tray detachably disposed in the heating chamber;
An illuminating unit disposed on a side surface or top surface of the heating chamber to illuminate the heating chamber;
A light receiving unit disposed at a position where illumination light from the illumination unit is blocked by the tray mounted in the heating chamber;
A tray determination unit for determining whether or not the tray is mounted in the heating chamber based on a light reception signal from the light receiving unit ;
A failure determination unit that determines whether or not the illumination unit is in failure based on a light reception signal from the light reception unit;
A door opening / closing detector for detecting opening / closing of the door attached to the opening of the heating chamber so as to be freely opened and closed;
When the door opening / closing detection unit detects that the door has been opened from an operation stop state in which the illumination unit is turned off, an illumination control unit that turns on the illumination unit;
With
The failure determination unit detects that the door opening / closing detection unit has opened the door, and sets the level of a light reception signal from the light receiving unit in a state where the lighting control unit lights the lighting unit. When it is below the made failure detection threshold value, it determines with the said illumination part being a failure, The heating cooker characterized by the above-mentioned . A heating chamber in which an object to be heated is accommodated;
A microwave generator for generating microwaves for heating the object to be heated in the heating chamber;
A tray detachably disposed in the heating chamber;
An illuminating unit disposed on a side surface or top surface of the heating chamber to illuminate the heating chamber;
A light receiving unit disposed at a position where illumination light from the illumination unit is blocked by the tray mounted in the heating chamber;
A tray determination unit for determining whether or not the tray is mounted in the heating chamber based on a light reception signal from the light receiving unit;
A flame occurrence determination unit that determines that a flame has occurred in the heating chamber when a level of a light reception signal from the light reception unit is equal to or higher than a preset flame detection threshold;
With
The flame detection threshold is higher than a level of a light reception signal representing illumination light from the illumination unit received by the light reception unit, and a light reception signal representing discharge light generated in the heating chamber received by the light reception unit. A cooking device characterized by being set lower than the level. The heating cooker according to claim 1 or 2 ,
When the tray determination unit determines that the tray is mounted in the heating chamber during cooking by the microwave, the microwave generation unit is controlled so as not to generate the microwave from the microwave generation unit. A cooking device comprising a microwave control unit. In the heating cooker according to any one of claims 1 to 3 ,
The cooking device according to claim 1, wherein the light receiving unit is disposed on a rear side of the heating chamber. In the heating cooker according to any one of claims 1 to 4 ,
A discharge determination unit that determines that a discharge is generated in the heating chamber when the level of a light reception signal from the light reception unit is equal to or higher than a preset discharge detection threshold during cooking by microwaves; A heating cooker featuring. The cooking device according to claim 2 ,
A cooking device, comprising: a failure determination unit that determines whether or not the illumination unit is defective based on a light reception signal from the light reception unit. The heating cooker according to claim 1, wherein
When a level of a light reception signal from the light receiving unit is equal to or higher than a preset flame detection threshold, a flame occurrence determination unit that determines that a flame has occurred in the heating chamber,
The flame detection threshold is higher than a level of a light reception signal representing illumination light from the illumination unit received by the light reception unit, and a light reception signal representing discharge light generated in the heating chamber received by the light reception unit. A cooking device characterized by being set lower than the level.

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