JP2017125645A - Heating cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heating cooker capable of performing cooking with heat with good finish by microwave heating, regardless of the initial temperature of a food.SOLUTION: The heating cooker includes: a microwave control part (80a) for controlling a microwave generating part (4) so as to perform a heating operation to heat an object to be heated to a target temperature by microwaves supplied from the microwave generating part (4) into a heating chamber; a time measuring part (80b) for measuring a time until the temperature of the object to be heated detected by an infrared sensor (303) rises from a first determination temperature higher than the initial temperature to a second determination temperature, during the heating operation; and a heating time estimating part (80c) for estimating a heating time until the temperature of the object to be heated reaches the target temperature from the second determination temperature on the basis of the time measured by the time measuring part (80b) and the target temperature. The microwave control part (80a) continues the heating operation for a period until the heating time has elapsed from the time when the temperature of the object to be heated reaches the second determination temperature.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a cooking device.

  Conventionally, a cooking device is selected based on an arrival time from the start of cooking to the time when the temperature of the food reaches a predetermined temperature by detecting the temperature of the food with an infrared sensor during microwave cooking. The additional heating time is calculated using a linear equation determined for each food, and cooking is terminated after the additional heating time has elapsed after reaching a predetermined temperature (for example, Japanese Patent Application Laid-Open No. 2015-175591 (Patent Document). 1)).

Japanese Patent Laying-Open No. 2015-175591

However, in the heating cooker, the time to reach the predetermined temperature differs depending on the initial temperature of the food, so the additional heating time is set based on the arrival time from the start of cooking by microwave until the predetermined temperature is reached. When calculated, the finish of the frozen food is overheated, and there is a problem that the finish is different between the frozen food and the room temperature food.
In the above cooking device, if water vapor is generated from the food from the start of cooking by microwave until the predetermined temperature is reached, the temperature of the food cannot be accurately detected by the infrared sensor, and the correct additional heating time is set. Cannot be calculated.

  Accordingly, an object of the present invention is to provide a cooking device capable of cooking with good finish by microwave heating regardless of the initial temperature of food.

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 stored;
A microwave generator for generating microwaves for heating the object to be heated in the heating chamber;
An infrared sensor for detecting the temperature of the object to be heated in the heating chamber;
A microwave control unit that controls the microwave generation unit so as to heat the object to be heated to a target temperature by the microwave supplied from the microwave generation unit into the heating chamber;
A time measuring unit for measuring a time until the temperature of the object to be heated detected by the infrared sensor rises from a first determination temperature higher than an initial temperature to a second determination temperature;
A heating time estimation unit that estimates a heating time from the second determination temperature to the target temperature based on the time measured by the time measurement unit and the target temperature. ,
The microwave control unit continues the heating operation for a period from when the temperature of the object to be heated reaches the second determination temperature until the heating time estimated by the heating time estimation unit elapses. The microwave generator is controlled.

Moreover, in the heating cooker of one embodiment,
The second determination temperature is equal to or lower than a temperature at which water vapor starts to be generated from the heated object.

Moreover, in the heating cooker of one embodiment,
A fan that stirs the inside of the heating chamber at the temperature equal to or lower than the second determination temperature during the heating operation is provided.

Moreover, in the heating cooker of one embodiment,
The fan stirs the inside of the heating chamber at least for a period until the temperature of the object to be heated detected by the infrared sensor reaches the second determination temperature from the first determination temperature.

Moreover, in the heating cooker of one embodiment,
The fan is a circulation fan that circulates the gas in the heating chamber through a circulation passage.

Moreover, in the heating cooker of one embodiment,
The circulation fan is agitated during the heating operation by operating at a rotation speed lower than the normal rotation speed.

  As is clear from the above, according to the present invention, it is possible to realize a cooking device capable of cooking with good finish by microwave heating regardless of the initial temperature of the food.

FIG. 1 is a schematic front view of the heating cooker according to the first embodiment of the present invention when the door is closed. FIG. 2 is a schematic front view of the heating cooker when the door is opened. FIG. 3 is a schematic diagram for explaining the configuration of the main part of the cooking device. FIG. 4A is a schematic diagram for explaining a configuration of a main part including an air supply unit of the heating cooker. FIG. 4B is a schematic diagram for explaining a configuration of a main part including the exhaust unit of the heating cooker. FIG. 5 is a perspective view of a state where a part of the main casing of the cooking device is removed. FIG. 6A is a schematic diagram for explaining the operation of the infrared sensor of the cooking device. FIG. 6B is a schematic diagram for explaining the operation of the infrared sensor of the cooking device. FIG. 6C is a schematic diagram for explaining the operation of the infrared sensor of the cooking device. Drawing 6D is a mimetic diagram for explaining operation of an infrared sensor of the above-mentioned cooking-by-heating machine. FIG. 7 is a control block diagram of the cooking device. FIG. 8 is a diagram showing a temperature change of an object to be heated in the heating chamber of the heating cooker. FIG. 9 is a schematic view of a heating cooker according to the fifth embodiment of the present invention.

  Hereinafter, the cooking device of the present invention will be described in detail with reference to the illustrated embodiments. In the drawings, the same reference numerals represent the same or corresponding parts. In addition, dimensions on the drawing such as length, width, thickness, and depth are appropriately changed from actual scales for clarity and simplification of the drawings, and do not represent actual relative dimensions.

[First Embodiment]
FIG. 1: shows the schematic front view at the time of door closing of the heating cooker of 1st Embodiment of this invention, FIG. 2 has shown the schematic front view at the time of the door opening of the said heating cooker.

  As shown in FIGS. 1 and 2, the cooking device of the first embodiment includes a rectangular parallelepiped main body casing 1, a heating chamber 2 provided in the main body casing 1 and having an opening 2a on the front side, and a heating device. And a door 3 for opening and closing the opening 2a of the storage 2.

  An exhaust duct 5 having an outlet 5 a is provided on the upper side and the rear side of the main body casing 1. A dew receptacle 6 is detachably attached to the lower part of the front surface of the main casing 1. The dew receptacle 6 is located below the door 3 and can receive water droplets from the rear surface of the door 3 (the surface on the heating chamber 2 side) and the front plate 55 of the main casing 1. A water supply tank 26 is also detachably attached to the lower part of the front surface of the main casing 1.

  The door 3 is attached to the front side of the main casing 1 so as to be rotatable about the lower side as an axis. A transparent outer glass 7 having heat resistance is provided on the front surface of the door 3 (the surface opposite to the heating chamber 2). The door 3 has a handle 8 positioned above the outer glass 7 and an operation panel 9 provided on the right side of the outer glass 7.

  The operation panel 9 has a color liquid crystal display unit 10 and a button group 11. The button group 11 includes a cancel key 12 that is pressed when heating is stopped halfway, and a start key 13 that is pressed when heating is started. The operation panel 9 is provided with an infrared light receiving unit 14 that receives infrared rays from a smartphone or the like.

  An object to be heated 15 is accommodated in the heating chamber 2. Moreover, the metal cooking trays 91 and 92 (shown in FIG. 3) can be taken in and out of the heating chamber 2. Upper shelf receivers 16 </ b> A and 16 </ b> B that support the cooking tray 91 are provided on the inner surfaces of the left side 2 b and the right side 2 c of the heating chamber 2. Moreover, lower shelf receivers 17A and 17B that support the cooking tray 92 are provided on the inner surfaces of the right side portion 2c and the left side portion 2b of the heating chamber 2 so as to be positioned below the upper shelf receivers 16A and 16B. .

  Drawing 3 is a mimetic diagram for explaining the composition of the principal part of the above-mentioned cooking-by-heating machine. In this FIG. 3, the state which looked at the heating chamber 2 from the left side is shown. In FIG. 3, the same components as those in FIGS. 1 and 2 are denoted by the same reference numerals.

  The heating cooker includes a circulation duct 18, a circulation fan 19, an upper heater 20, an intermediate heater 21, a lower heater 22, a circulation damper 23, a tube pump 25, a water supply tank 26, and a steam generator 70. I have. The circulation duct 18 is an example of a circulation passage, and the circulation fan 19 is an example of a fan that stirs the inside of the heating chamber 2. Each of the upper heater 20, the middle heater 21, and the lower heater 22 is a sheathed heater, for example. In addition, the tube pump 25 should just be a pump which can switch water supply operation | movement and drainage operation with a drive direction.

  Note that the fan that stirs the inside of the heating chamber 2 may be provided separately from the circulation fan 19.

  The upper part 2e of the heating chamber 2 is connected to the rear portion 2d of the heating chamber 2 through an inclined portion 2f that is inclined with respect to the horizontal direction. The inclined portion 2f is provided with a plurality of suction ports 27 so as to face the circulation fan 19 (see FIG. 2). A plurality of upper air outlets 28 are provided in the upper part 2 e of the heating chamber 2. A plurality of first rear outlets 29, second rear outlets 30, and third rear outlets 31 are provided in the rear part 2d of the heating chamber 2 (see FIG. 2). In FIG. 3, only one of the plurality of suction ports 27 is shown. Further, in FIG. 3, only one each of the first rear outlet 29, the second rear outlet 30, and the third rear outlet 31 is shown.

  The circulation duct 18 communicates with the inside of the heating chamber 2 through the suction port 27, the upper outlet 28, and the first to third rear outlets 29-31. The circulation duct 18 is provided from the upper side to the rear side of the heating chamber 2 and extends so as to exhibit an inverted L shape. The width in the left-right direction of the circulation duct 18 is set to be narrower than the width in the left-right direction of the heating chamber 2.

  The circulation fan 19 is a centrifugal fan and is driven by a circulation fan motor 56. When the circulation fan motor 56 drives the circulation fan 19, air or saturated steam (hereinafter referred to as “air” or the like) in the heating chamber 2 is sucked into the circulation duct 18 from the plurality of suction ports 27 and circulated. Blows out radially outward of the fan 19. More specifically, on the upper side of the circulation fan 19, air or the like flows obliquely upward from the circulation fan 19 and then flows from the rear toward the front. On the other hand, below the circulation fan 19, air or the like flows obliquely downward from the circulation fan 19 and then flows downward from above. The air is an example of a heat medium.

  An internal temperature sensor 76 (shown in FIG. 7) is disposed in the circulation duct 18 and in the vicinity of the outside of the circulation fan 19. The internal temperature sensor 76 detects the temperature of the heat medium sucked from the heating chamber 2 through the suction port 27, that is, the internal temperature.

  The upper heater 20 is disposed in the circulation duct 18 and faces the upper portion 2 e of the heating chamber 2. The upper heater 20 heats air flowing to the upper outlet 28.

  The middle heater 21 is formed in an annular shape and surrounds the circulation fan 19. The middle heater 21 heats air or the like from the circulation fan 19 toward the upper heater 20 or heats air or the like from the circulation fan 19 toward the lower heater 22.

  The lower heater 22 is disposed in the circulation duct 18 and faces the rear portion 2 d of the heating chamber 2. The lower heater 22 heats air flowing to the second and third rear outlets 30 and 31.

  The circulation damper 23 is rotatably provided in the circulation duct 18 and between the middle heater 21 and the lower heater 22. The circulation damper 23 is rotated by a circulation damper motor (not shown).

  Further, the steam generator 70 includes a metal steam generating container 71 having an upper opening, a lid portion 72 made of a heat resistant resin (for example, PPS (polyphenylene sulfide) resin) covering the upper opening of the steam generating container 71, and And a steam generating heater 73 formed of a sheathed heater cast into the bottom 71a of the steam generating container 71. Water from the water supply tank 26 accumulates on the bottom 71 a of the steam generation container 71, and a steam generation heater 73 heats the water through the steam generation container 71. The saturated steam generated by heating by the steam generating heater 73 flows through the resin steam tube 35 and the metal steam pipe 36 and is supplied into the heating chamber 2 through the plurality of steam supply ports 37. (See FIG. 2). In FIG. 3, only one of the plurality of steam supply ports 37 is shown.

  The saturated steam in the heating chamber 2 is sent to the upper heater 20, the middle heater 21 and the lower heater 22 by the circulation fan 19, and heated by the upper heater 20, the middle heater 21 and the lower heater 22, thereby being 100 ° C. It becomes the above superheated steam.

  A water level sensor 75 comprising a pair of electrode rods 75a and 75b is attached to the lid portion 72. Based on whether or not the electrode rods 75a and 75b are in a conductive state, it is determined whether or not the water level on the bottom 71a of the steam generating container 71 has reached a predetermined water level.

  The tube pump 25 squeezes the elastically deformable water supply / drainage tube 40 made of silicon rubber or the like with a roller (not shown), and causes the water in the water supply tank 26 to flow to the steam generator 70 depending on the driving direction of the roller. Or the water in the steam generator 70 is caused to flow into the water supply tank 26.

  The water supply tank 26 has a water supply tank main body 41 and a communication pipe 42. One end of the communication pipe 42 is located in the water supply tank body 41, while the other end of the communication pipe 42 is located outside the water supply tank 26. When the water supply tank 26 is accommodated in the tank cover 43, the other end of the communication pipe 42 is connected to the water supply / drainage tube 40 via the tank joint 44. That is, the inside of the water supply tank main body 41 communicates with the inside of the steam generator 70 via the communication pipe 42 and the like.

  The tube pump 25, the water supply tank 26, the water supply / drainage tube 40, the tank cover 43, and the tank joint portion 44 constitute a water supply device.

  FIG. 4A shows a schematic diagram for explaining a configuration including the air supply unit 100 of the heating cooker. 4A also shows a state in which the heating chamber 2 is viewed from the left side as in FIG. In FIG. 4A, the same components as those in FIG. 3 are denoted by the same reference numerals.

  In addition, a plurality of air supply ports 50 that are opened and closed by an air supply damper 51 are provided in the inclined portion 2f of the heating chamber 2 (see FIG. 2). The plurality of air supply ports 50 and the air supply fan 54 are connected via the air supply passage 101. A cooling damper 52 is provided in the first cooling passage 102 that branches from the vicinity of the air inlet 50 of the air supply passage 101. For example, the air supply fan 54 is a sirocco fan.

  In addition, an infrared sensor unit 300 is disposed in the recess 110 provided in the upper part 2e of the heating chamber 2.

  The air supply fan 54 serves as a cooling fan for cooling the circulation fan motor 56 (shown in FIG. 3) and the infrared sensor unit 300.

  A schematic diagram showing the configuration of the infrared sensor unit 300 is shown in the lower circle portion of FIG. 4A. As shown in FIG. 4A, the infrared sensor unit 300 includes a cylindrical holding member 301 in which the axial direction is attached to the concave portion 110 provided in the upper portion 2 e of the heating chamber 2 in the front-rear direction and the horizontal direction, and the holding member. A substantially cylindrical movable member 302 that is rotatably supported in 301, and an infrared sensor motor 304 that is attached to one end on the front side of the holding member 301 and drives the movable member 302. The movable member 302 has an infrared sensor 303.

  In this embodiment, the infrared sensor 303 is an area sensor that detects the temperature of 64 regions of 8 × 8, but the infrared sensor is not limited to this and may be a line sensor in which sensor portions are arranged in a straight line. .

  The infrared sensor unit 300 rotates the substantially cylindrical movable member 302 by the infrared sensor motor 304 so that the detection surface (not shown) of the infrared sensor 303 is directed toward the inside of the heating chamber 2, and the infrared sensor unit 300 An axis perpendicular to the detection surface of the sensor 303 is rotated within a predetermined angle range (for example, 20 degrees) along the horizontal direction and the vertical plane of the main casing 1 (see FIGS. 6A to 6D). A sensor window 120 is provided in a recess 110 provided in the upper part 2 e of the heating chamber 2. The infrared sensor 303 detects the temperature in the heating chamber 2 through the sensor window 120.

  In FIG. 4A, the air from the air supply fan 54 is supplied into the heating chamber 2 through the plurality of air supply ports 50 in a state where the air supply damper 51 is opened. At this time, the first cooling passage 102 is closed by the cooling damper 52. Further, excess air in the heating chamber 2 naturally flows out from the natural exhaust port 45 to the fourth air passage 204.

  Next, when the air supply damper 51 is closed and the plurality of air supply ports 50 are closed and the first cooling passage 102 is opened by the cooling damper 52, a part of the air from the air supply fan 54 is exchanged with the air supply passage 101. It is supplied to the circulation fan motor 56 (shown in FIG. 3) via the first cooling passage 102.

  Further, by closing the air supply damper 51, the second cooling passage 103 provided in the vicinity of the air supply damper 51 opens, and the infrared sensor unit 300 in which the remaining air from the air supply fan 54 is disposed on the top surface side. To be supplied. The supply air passage 101, the first cooling passage 102, and the second cooling passage 103 constitute a cooling passage for cooling the circulation fan motor 56 (shown in FIG. 3) and the infrared sensor 303.

  Moreover, FIG. 4B has shown the schematic diagram for demonstrating the structure containing the exhaust unit 200 of the said heating cooker. 4B also shows a state in which the heating chamber 2 is viewed from the right side as in FIG. In FIG. 4B, 201 is a first air passage, 202 is a second air passage, 203 is a third air passage, and 207 is a dilution area section.

  A natural exhaust port 45 is provided at the lower end of the rear portion 2d of the heating chamber 2 (see FIG. 2). The natural exhaust port 45 communicates with the exhaust duct 5 via the fourth air passage 204 of the exhaust unit 200 and the like. When the air in the heating chamber 2 becomes excessive, the excess air naturally flows out from the natural exhaust port 45 to the fourth air passage 204. A part of the air blown from the exhaust fan 47 is supplied to the front side in the main body casing 1 (shown in FIG. 1) via the third air passage 203.

  A plurality of forced exhaust ports 48 that are opened and closed by an exhaust damper 49 are provided in the inclined portion 2f of the heating chamber 2 (see FIG. 2). The forced exhaust port 48 communicates with the exhaust duct 5 via the exhaust unit 200.

  A humidity sensor 53 is attached to the exhaust unit 200. The humidity sensor 53 sends a signal indicating the amount of steam contained in the exhaust gas flowing through the second wind passage 202 to the control device 80 (shown in FIG. 7).

  In addition, in the case of steaming cooking, the infrared sensor 303 of the infrared sensor unit 300 is reversed 180 degrees so as to face the direction opposite to the heating chamber 2, thereby taking measures against moisture from the heating chamber 2.

  FIG. 5 shows a perspective view of the heating cooker from which the upper surface plate 1a and the rear surface plate (not shown) covering the upper surface and both side surfaces of the main casing 1 (shown in FIG. 1) are removed as viewed from the rear and obliquely upward. . In FIG. 5, the same components as those in FIGS.

  As shown in FIG. 5, an air supply unit 100 is provided on the rear side and the left side (right side in FIG. 5) of the heating chamber 2. The air supply unit 100 includes an air supply fan 54 arranged on the lower side, an air supply passage 101 extending upward from the air supply fan 54, and a branch from the upper side of the air supply passage 101, It has the 1st cooling channel | path 102 extended toward the motor 56 for circulation fans located in the center of the rear upper part of the store | warehouse | chamber 2. As shown in FIG. Specifically, the air supply unit 100 extends upward from the air supply fan 54 so as to exhibit an inverted L shape.

  An exhaust unit 200 is provided on the rear side and the right side (left side in FIG. 5) of the heating chamber 2. The exhaust unit 200 includes a housing 210 including an exhaust unit cover 220 and an exhaust fan 47 disposed below the housing 210.

  An exhaust damper motor 60 is disposed on the right side of the upper portion of the exhaust unit 200 (left side in FIG. 5). This exhaust damper motor 60 opens and closes an exhaust damper 49 (FIG. 4B) provided in the upper part of the exhaust unit 200.

  A partition plate 111 is erected in the front-rear direction on the upper portion 2 e of the heating chamber 2. By this partition plate 111, the cooling air flowing from the second cooling passage 103 (shown in FIG. 4A) provided in the vicinity of the air supply damper 51 (shown in FIG. 4A) to the region of the infrared sensor unit 300 is left in the main casing 1. It is blocked so that it does not flow to the surface.

  Moreover, FIG. 6A-FIG. 6D has shown the schematic diagram for demonstrating operation | movement of the infrared sensor 303 of the said heating cooker.

  6A and 6B show a temperature detection range by the infrared sensor 303 (shown in FIG. 4A) of the infrared sensor unit 300 when detecting the temperature of the object to be heated on the cooking tray 91 placed on the upper stage. The temperature detection range shown in FIG. 6A is the left region on the cooking tray 91 in front view, and the temperature detection range shown in FIG. 6B is the right region on the cooking tray 91 in front view. The cylindrical movable member 302 having the infrared sensor 303 is rotated by the infrared sensor motor 304 to swing the detection surface (not shown) of the infrared sensor 303 in the left-right direction. In this embodiment, the temperature detection range of the infrared sensor 303 is divided into three regions: a left region shown in FIG. 6A, a right region shown in FIG. 6B, and a central region between the left region and the right region. However, it may be divided into four or more regions.

  6C and 6D show the temperature detection range by the infrared sensor 303 (shown in FIG. 4A) of the infrared sensor unit 300 when detecting the temperature of the object to be heated on the bottom surface of the heating chamber 2. The temperature detection range shown in FIG. 6C is the left region on the bottom surface of the heating chamber 2 in front view, and the temperature detection range shown in FIG. 6D is the right region on the bottom surface of the heating chamber 2 in front view. In this embodiment, as in FIGS. 6A and 6B, the temperature detection range of the infrared sensor 303 includes the left region shown in FIG. 6C, the right region shown in FIG. 6D, and the left region and the right region. Although it is divided into three areas of the central area, it may be divided into a plurality of areas of 4 or more.

  FIG. 7 shows a control block diagram of the cooking device.

  As shown in FIG. 7, the heating cooker includes a control device 80 including a microcomputer and an input / output circuit. The control device 80 includes an upper heater 20, an intermediate heater 21, a lower heater 22, a steam generating heater 73, a circulation fan motor 56, an exhaust fan motor 57, an air supply fan motor 58, a circulation damper motor 59, Exhaust damper motor 60, supply damper motor 61, cooling damper motor 62, operation panel 9, humidity sensor 53, internal temperature sensor 76, water level sensor 75, tube pump 25, magnetron 4, infrared sensor 303, infrared sensor A motor 304 or the like is connected. The magnetron 4 is an example of a microwave generation unit that generates a microwave for heating an object to be heated in the heating chamber 2.

  The control device 80 is based on signals from the operation panel 9, humidity sensor 53, internal temperature sensor 76, water level sensor 75, infrared sensor 303, etc., for the upper heater 20, the middle heater 21, the lower heater 22, and steam generator. Heater 73, circulation fan motor 56, exhaust fan motor 57, supply fan motor 58, circulation damper motor 59, exhaust damper motor 60, supply damper motor 61, cooling damper motor 62, tube pump 25 , Magnetron 4, infrared sensor motor 304 and the like are controlled.

  Further, the control device 80 includes a microwave control unit 80a that controls the magnetron 4 and the temperature of the object to be heated detected by the infrared sensor 303 during the heating operation of the magnetron 4 by the microwave is higher than the initial temperature. Based on the time measurement unit 80b that measures the time Ts until the first determination temperature t1 rises to the second determination temperature t2, and the time Ts measured by the time measurement unit 80b and the target temperature tm, the temperature of the object to be heated Has a heating time estimation unit 80c for estimating the heating time Tk from the second determination temperature t2 to the target temperature tm. Here, the initial temperature of the object to be heated may be the temperature of the object to be heated before the heating operation, or the temperature of the object to be heated after the start of the heating operation.

  FIG. 8 shows the temperature change of the object to be heated in the heating chamber 2 of the cooking device. In FIG. 8, the horizontal axis represents time [second], and the vertical axis represents the temperature [° C.] of the heated object detected by the infrared sensor 303. Note that the temperature [° C.] of the object to be heated is an average value of the temperatures of three regions having the highest temperature among 64 regions (8 × 8) detected by the infrared sensor 303.

  The conditions at this time are: two lunch boxes (without lid), microwave output of 600 W, heating time of 3 minutes (fixed time), and initial temperature of the heated object of 19 ° C.

  As shown in FIG. 8, the gradient of the temperature change of the object to be heated is substantially constant up to 60 ° C. except for the initial stage of heating. On the other hand, when the temperature of the object to be heated exceeds 60 ° C., the detection surface of the infrared sensor 303 is condensed due to the influence of water vapor generated from the object to be heated, that is, food. The temperature of the food detected by 303 fluctuates.

  However, it is possible to predict the temperature change in the region B exceeding 60 ° C. from the temperature increase in the region A of 50 ° C. to 60 ° C. of the object to be heated shown in FIG.

  Therefore, in the cooking device configured as described above, the first determination temperature t1 (50 ° C. in this embodiment) in which the temperature of the object to be heated detected by the infrared sensor 303 is higher than the initial temperature during the microwave heating operation. The time Ts until the temperature rises to the second determination temperature t2 (60 ° C. in this embodiment) is measured by the time measuring unit 80b.

Next, based on the time Ts measured by the time measuring unit 80b and the target temperature tm, the heating time Tk from the second determination temperature t2 to the target temperature tm is calculated by the heating time estimating unit 80c. presume. Here, if the microwave output of the microwave generation unit 4 is constant during the heating operation, the gradient Δt of the temperature change of the object to be heated up to about 20 ° C. to about 80 ° C. excluding the initial heating stage is the heating load (covered). Since the temperature of the object to be heated reaches the target temperature tm from the second determination temperature t2, the remaining heating time Tk is constant for each heating object)
Tk = (tm−t2) / Δt [second]
Can be estimated.

At this time, the gradient Δt of the temperature change of the object to be heated in the section from the first determination temperature t1 to the second determination temperature t2 is:
Δt = (t2−t1) / Ts [° C./second]
And is obtained from the first determination temperature t1, the second determination temperature t2, and the time Ts measured by the time measuring unit 80b.

Therefore, the remaining heating time Tk until the temperature of the object to be heated reaches the target temperature tm from the second determination temperature t2 is:
Tk = Ts × (tm−t2) / (t2−t1) [seconds]
Is calculated by

  Thus, the microwave control unit 80a performs a heating operation using microwaves during a period from when the temperature of the object to be heated reaches the second determination temperature t2 until the heating time Tk estimated by the heating time estimation unit 80c elapses. The microwave generator 4 is controlled so as to continue. That is, when the temperature of the object to be heated reaches the second determination temperature t2, the temperature of the object to be heated is not detected by the infrared sensor 303, and the heating operation is controlled with the remaining heating time Tk.

  For example, in the case of cooking by heating food with microwaves, the target temperature tm is about 80 ° C., and the temperature of the object to be heated is detected by the infrared sensor 303 until the temperature of the object to be heated is 60 ° C. of the second determination temperature t 2. Then, after 60 ° C. of the second determination temperature t2, the heating operation is performed up to the target temperature tm with the estimated remaining heating time Tk.

  In the heating cooker, when the temperature of the object to be heated reaches 60 ° C. of the second determination temperature t2, water vapor starts to be generated from the object to be heated in the heating chamber 2, so the infrared sensor 303 of the infrared sensor unit 300 is set. It is inverted 180 degrees so that it faces in the opposite direction to the heating chamber 2. This prevents the infrared sensor 303 from being affected by water vapor generated in the heating chamber 2.

  Thus, according to the cooking device of the first embodiment, regardless of the initial temperature of the food at the start of microwave cooking, that is, whether the food is frozen food or normal temperature food, Can be accurately heated to the target temperature tm, and cooking with good finish can be performed.

  Further, in the heating operation using the microwave, the temperature of the object to be heated using the second determination temperature t2 together with the first determination temperature t1 by setting the second determination temperature t2 to a temperature at which water vapor starts to be generated from the object to be heated. In the determination, the temperature of the object to be heated can be accurately detected by the infrared sensor 303 without being hindered by water vapor, and the time until the temperature rises from the first determination temperature t1 to the second determination temperature t2 is accurately measured by the time measuring unit 80b. it can.

  In the first embodiment, since it is preferable to predict at a high temperature in consideration of summertime when the temperature is high, continuous heating, or the like, the first determination temperature t1 is 50 ° C. and the second determination temperature t2 is 60 ° C., The first determination temperature t1 and the second determination temperature t2 are not limited to this, and may be set within a temperature range in which the gradient Δt of the temperature change of the object to be heated is constant without being affected by water vapor. You may set according to the initial temperature of a heating thing.

[Second Embodiment]
The heating cooker of 2nd Embodiment of this invention has the structure same as the heating cooker of 1st Embodiment except the operation | movement of the circulation fan 19, and uses FIGS. 1-7.

  In the heating cooker according to the second embodiment, the inside of the heating chamber 2 is agitated by the circulation fan 19 at the second determination temperature t2 or less during the heating operation by the microwave. As a result, even if water vapor is generated from the object to be heated, the distribution of the water vapor in the heating chamber 2 becomes uniform due to the stirring of the circulation fan 19 and becomes lean, and the temperature of the object to be heated is accurately determined by the infrared sensor 303. Can be detected.

  In addition, since the gas in the heating chamber 2 is circulated by the circulation fan 19 through the circulation duct 18 (circulation passage) to agitate the inside of the heating chamber 2, the circulation fan 19 used in the convection oven is also used. The structure can be simplified and the cost can be reduced without newly providing a stirring fan.

  The heating cooker of the second embodiment has the same effect as the heating cooker of the first embodiment.

  In addition, in the heating cooker of the said structure, the bias of the air current in the heating chamber 2 can be reduced by alternately performing the forward rotation and the reverse rotation of the circulation fan 19, and the heating chamber 2 can be stirred more uniformly. it can.

  Moreover, according to the said heating cooker, after the temperature of a to-be-heated object exceeds the 2nd determination temperature t2 during the heating operation by a microwave, the inside of the heating chamber 2 is stirred by the circulation fan 19, and the infrared sensor 303 is thereby stirred. Thus, the temperature of the object to be heated can be measured up to 70 ° C. without being affected by water vapor. In this case, since the oven cooking using the upper heater 20, the middle heater 21, and the lower heater 22 (shown in FIG. 3) was performed immediately before, a part of the inside of the heating chamber 2 is 50 at the start of the microwave heating operation. Even if the temperature is as high as about 0 ° C., the temperature of the object to be heated can be detected as it is by the infrared sensor 303 and can be heated to the target temperature Tm (for example, 70 ° C.).

[Third Embodiment]
The heating cooker of 3rd Embodiment of this invention has the structure same as the heating cooker of 1st Embodiment except the operation | movement of the circulation fan 19, and uses FIGS. 1-7.

  In the heating cooker according to the third embodiment, during the heating operation by the microwave, a period until the temperature of the object to be heated detected by the infrared sensor 303 becomes the second determination temperature t2 from the first determination temperature t1, The inside of the heating chamber 2 is stirred by the circulation fan 19. Accordingly, the temperature of the object to be heated can be accurately detected by the infrared sensor 303 while suppressing the drying of the object to be heated by stirring, and therefore, the temperature determination of the object to be heated using the first determination temperature t1 and the second determination temperature t2. Can be done accurately.

  Further, by stirring the inside of the heating chamber 2 with the circulation fan 19, the infrared sensor 303 can detect up to 70 ° C. at which water vapor is generated from the object to be heated, so the second determination temperature t2 is set to 70 ° C. (<target Temperature tm) can be set, and the temperature change from the first determination temperature t1 to the second determination temperature t2 can be grasped more accurately.

  The heating cooker of the said 3rd Embodiment has an effect similar to the heating cooker of 1st Embodiment.

[Fourth Embodiment]
The heating cooker according to the fourth embodiment of the present invention has the same configuration as that of the heating cooker according to the first embodiment except for the operation of the circulation fan 19, and uses FIGS.

  In the heating cooker of the fourth embodiment, when the inside of the heating chamber 2 is agitated by the circulation fan 19 during the microwave heating operation, the circulation fan 19 is rotated at a rotation speed lower than the normal rotation speed (normal rotation in this embodiment). Drive at half the number). Thereby, drying of a to-be-heated material can be suppressed, detecting the temperature of a to-be-heated material correctly with the infrared sensor 303, without receiving the influence of water vapor | steam from a to-be-heated material.

  Here, the normal number of rotations of the circulation fan 19 refers to the inside of the heating chamber 2 in cooking using the upper heater 20, the middle heater 21, and the lower heater 22 (shown in FIG. 3) or cooking using superheated steam. Is the number of rotations of the circulation fan 19 when it is circulated by the circulation fan 19 through the circulation duct 18 (circulation passage).

  The heating cooker of the fourth embodiment has the same effect as the heating cooker of the first embodiment.

[Fifth Embodiment]
FIG. 9: has shown the schematic diagram of the heating cooker of 5th Embodiment of this invention. The cooking device of this fifth embodiment is provided with an exhaust port 402 for forcibly exhausting the air in the heating chamber 2 and a natural air supply port 401 for natural air supply, and the position of the infrared sensor 403. It has the same configuration as the cooking device of the first embodiment.

  The heating cooker of the fifth embodiment is provided with a natural air supply port 401 for naturally supplying air to the left side wall in the heating chamber 2 and is opposed to the natural air supply port 401 on the right side wall in the heating chamber 2. An exhaust port 402 for forced exhaust is provided at the position.

  In addition, a sensor window 404 for the infrared sensor 403 is provided in the vicinity of the natural air inlet 401 provided on the right side wall in the heating chamber 2.

  Thereby, the water vapor generated from the food can be forcibly exhausted efficiently, and the influence on the temperature detection of the infrared sensor 403 can be reduced as much as possible.

  The cooking device of the fifth embodiment has the same effect as the cooking device of the first embodiment.

  In addition, a natural air supply port for natural air supply is provided on the left side wall in the heating chamber 2, and an exhaust port for forced exhaust is provided at a position facing the air supply port on the right side wall in the heating chamber 2. Good. In addition, the exhaust port for forcibly exhausting the air in the heating chamber and the air supply port for naturally supplying air are not limited to this, and are arranged at positions facing each other on the side wall of the heating chamber, and the natural air inlet port. Alternatively, an infrared sensor may be provided on the upstream side of the airflow to the exhaust port.

  In the first to fifth embodiments, the heating cooker including the infrared sensor 303 that detects the temperature of 64 regions of 8 × 8 is described, but the line that detects the temperatures of a plurality of regions arranged in a straight line. You may apply this invention to the heating cooker using the infrared sensor which is a sensor, and the infrared sensor which detects the temperature of a single area | region.

  Moreover, although the said 1st-5th embodiment demonstrated the microwave oven provided with the heating function using vapor | steam, this invention is applied to the microwave oven, microwave oven, etc. which are not equipped with the heating function using vapor | steam. May be.

  Although specific embodiments of the present invention have been described, the present invention is not limited to the first to fifth embodiments, and various modifications can be made within the scope of the present invention. For example, what combined suitably the content described in the said 1st-5th embodiment is good also as one Embodiment of this invention.

  The present invention and the embodiment are summarized as follows.

The cooking device of this invention is
A heating chamber 2 in which an object to be heated is accommodated;
A microwave generator 4 for generating microwaves for heating the object to be heated in the heating chamber 2;
An infrared sensor 303 for detecting the temperature of the object to be heated in the heating chamber 2;
A microwave control unit 80a for controlling the microwave generation unit 4 so as to heat the object to be heated to the target temperature tm by the microwave supplied from the microwave generation unit 4 into the heating chamber 2,
A time measurement unit 80b for measuring a time Ts until the temperature of the object to be heated detected by the infrared sensor 303 rises from the first determination temperature t1 higher than the initial temperature to the second determination temperature t2,
Based on the time Ts measured by the time measuring unit 80b and the target temperature tm, the heating for estimating the heating time Tk until the temperature of the object to be heated reaches the target temperature tm from the second determination temperature t2. A time estimation unit 80c,
The microwave control unit 80a performs a heating operation for a period from when the temperature of the object to be heated reaches the second determination temperature t2 until the heating time Tk estimated by the heating time estimation unit 80c elapses. The microwave generation unit 4 is controlled so as to continue.

  According to the above configuration, for example, during the heating operation using microwaves, the temperature of the object to be heated detected by the infrared sensor 303 is increased from the first determination temperature t1 higher than the initial temperature to the second determination temperature t2. The time Ts is measured by the time measuring unit 80b. Next, based on the time Ts measured by the time measuring unit 80b and the target temperature tm, the heating time Tk from the second determination temperature t2 to the target temperature tm is calculated by the heating time estimating unit 80c. presume. Here, if the microwave output of the microwave generation unit 4 is constant, the gradient of the temperature change of the heated object is constant except for the initial stage of heating, so the temperature of the heated object is the target value from the second determination temperature t2. The remaining heating time Tk until reaching the temperature tm can be estimated from the gradient of the temperature change of the object to be heated and the target temperature tm. The inclination of the temperature change of the object to be heated at this time is obtained from the first determination temperature t1, the second determination temperature t2, and the time Ts measured by the time measuring unit 80b. Thus, the microwave control unit 80a continues the heating operation for a period from when the temperature of the object to be heated reaches the second determination temperature t2 until the heating time Tk estimated by the heating time estimation unit 80c elapses. Thus, the microwave generation unit 4 is controlled.

  Therefore, regardless of the initial temperature of the food at the start of microwave cooking, that is, whether the food is a frozen food or a normal temperature food, the food can be accurately heated to the target temperature tm, and the cooking is excellent in finish. It can be performed.

Moreover, in the heating cooker of one embodiment,
The second determination temperature t2 is equal to or lower than a temperature at which water vapor starts to be generated from the heated object.

  According to the above embodiment, in the temperature determination of the object to be heated using the second determination temperature t2 together with the first determination temperature t1, the second determination temperature t2 is set to be equal to or lower than the temperature at which water vapor starts to be generated from the object to be heated. The temperature of the object to be heated can be accurately detected by the infrared sensor 303 without being blocked by water vapor, and the time Ts until the temperature rises from the first determination temperature t1 to the second determination temperature t2 can be accurately measured by the time measuring unit 80b. .

Moreover, in the heating cooker of one embodiment,
A fan 19 that stirs the inside of the heating cabinet 2 at the second determination temperature t2 or less during the heating operation is provided.

  According to the embodiment, even if water vapor is generated from the object to be heated by stirring the inside of the heating chamber 2 by the fan 19 at the second determination temperature t2 or less during the heating operation by the microwave, the fan 19 is stirred. The distribution of water vapor in the heating chamber 2 becomes uniform and dilute, and the infrared sensor 303 can accurately detect the temperature of the object to be heated.

Moreover, in the heating cooker of one embodiment,
The fan 19 agitates the inside of the heating chamber 2 for at least a period until the temperature of the object to be heated detected by the infrared sensor 303 reaches the second determination temperature t2 from the first determination temperature t1.

  According to the above-described embodiment, for example, during the heating operation using microwaves, the fan 19 is in a period during which the temperature of the object to be heated detected by the infrared sensor 303 becomes at least the first determination temperature t1 to the second determination temperature t2. By stirring the inside of the heating chamber 2 with the infrared sensor 303, the temperature of the object to be heated can be accurately detected while suppressing the drying of the object to be heated by stirring, so the first determination temperature t1 and the second determination temperature t2 are The temperature of the used object to be heated can be accurately determined.

Moreover, in the heating cooker of one embodiment,
The fan 19 is a circulation fan 19 that circulates the gas in the heating chamber 2 through the circulation passage 18.

  According to the above embodiment, the inside of the heating chamber 2 is agitated by circulating the gas in the heating chamber 2 by the circulation fan 19 through the circulation passage 18, so that the circulation fan 19 used in a convection oven or the like is also used. In addition, the structure can be simplified and the cost can be reduced without newly providing a stirring fan.

Moreover, in the heating cooker of one embodiment,
The circulation fan 19 is agitated during the heating operation by operating at a rotation speed lower than the normal rotation speed.

  According to the above-described embodiment, when the inside of the heating chamber 2 is stirred by the circulation fan 19 during the heating operation by the microwave, the circulation fan 19 is operated at a rotation speed lower than the normal rotation speed, so that the object to be heated is removed. Without being influenced by water vapor, drying of the heated object can be suppressed while accurately detecting the temperature of the heated object by the infrared sensor 303.

DESCRIPTION OF SYMBOLS 1 ... Main body casing 2 ... Heating chamber 2a ... Opening 3 ... Door 4 ... Magnetron (microwave generation part)
5 ... Exhaust duct 6 ... Dew receptacle 7 ... Outer glass 8 ... Handle 9 ... Operation panel 10 ... Color liquid crystal display unit 11 ... Button group 12 ... Key 13 ... Start key 14 ... Infrared light receiving unit 15 ... Heated object 18 ... Circulation Duct (circulation passage)
DESCRIPTION OF SYMBOLS 19 ... Circulation fan 20 ... Upper heater 21 ... Middle heater 22 ... Lower heater 23 ... Circulation damper 25 ... Tube pump 26 ... Water supply tank 27 ... Suction port 28 ... Upper blower outlet 29 ... First rear blower outlet 30 ... Second rear blower Outlet 31 ... Third rear outlet 35 ... Steam tube 36 ... Steam pipe 37 ... Steam supply port 40 ... Water supply / drainage tube 41 ... Water supply tank body 42 ... Communication pipe 43 ... Tank cover 44 ... Tank joint 45 ... Natural exhaust port 46 ... Exhaust path 47 ... exhaust fan 48 ... forced exhaust port 49 ... exhaust damper 50 ... air supply port 51 ... air supply damper 52 ... cooling damper 53 ... humidity sensor 54 ... air supply fan 55 ... front plate 56 ... circulation fan motor 57 ... Motor for exhaust fan
58 ... Motor for air supply fan
59 ... Circulation damper motor 60 ... Exhaust damper motor 61 ... Supply damper motor 62 ... Cooling damper motor 70 ... Steam generator 71 ... Steam generation container 72 ... Lid 73 ... Steam generation heater 75 ... Water level sensor 76 ... Internal temperature sensor 80 ... Control device 80a ... Microwave control part 80b ... Time measuring part 80c ... Heating time estimation part 91 ... Cooking tray 92 ... Cooking tray 100 ... Air supply unit 101 ... Air supply passage 102 ... First cooling passage 103 ... second cooling passage 110 ... concave 111 ... partition plate 120 ... sensor window 200 ... exhaust unit 201 ... first air passage 202 ... second air passage 203 ... third air passage 204 ... fourth air passage 210 ... housing 220 ... exhaust unit cover 300 ... infrared sensor unit 301 ... holding member 302 ... movable member 303 ... infrared sensor 304 ... infrared sensor Use motor 401 ... natural air inlet 402 ... exhaust port 403 ... infrared sensor 404 ... sensor window

Claims (5)

A heating chamber in which an object to be heated is stored;
A microwave generator for generating microwaves for heating the object to be heated in the heating chamber;
An infrared sensor for detecting the temperature of the object to be heated in the heating chamber;
A microwave control unit that controls the microwave generation unit so as to heat the object to be heated to a target temperature by the microwave supplied from the microwave generation unit into the heating chamber;
A time measuring unit for measuring a time until the temperature of the object to be heated detected by the infrared sensor rises from a first determination temperature higher than an initial temperature to a second determination temperature;
A heating time estimation unit that estimates a heating time from the second determination temperature to the target temperature based on the time measured by the time measurement unit and the target temperature. ,
The microwave control unit continues the heating operation for a period from when the temperature of the object to be heated reaches the second determination temperature until the heating time estimated by the heating time estimation unit elapses. The cooking device characterized by controlling the microwave generation part. The heating cooker according to claim 1, wherein
The heating cooker, wherein the second determination temperature is equal to or lower than a temperature at which water vapor starts to be generated from the heated object. The heating cooker according to claim 1 or 2,
A cooking device comprising a fan that stirs the inside of the heating chamber at a temperature equal to or lower than the second determination temperature during the heating operation. The cooking device according to claim 3,
The fan stirs the inside of the heating chamber for a period until the temperature of the object to be heated detected by the infrared sensor reaches at least the second determination temperature from the first determination temperature. Cooking device. In the heating cooker according to claim 3 or 4,
The cooking device according to claim 1, wherein the fan is a circulation fan that circulates the gas in the heating chamber through a circulation passage.

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