JP2012024458A - Heating cooker and cooking method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To heat an inner pot to the maximum while preventing boil-over efficiently and surely.SOLUTION: A heating cooker (a rice cooker) including a cooker body 13 with the inner pot 10 disposed, and a lid body 39 disposed in an openable/closable manner on the cooker body 13, is adapted to heat the inner pot 10 by heating means (an induction heating coil 30) and to cook a cooked object while exhausting steam containing cooked object components generated in the inner pot 10, to the outside through an exhaust passage. A bubble breaking mechanism 77 having a rotation body (a blade member 78) for breaking bubbles, and driving means (a motor 85) is provided at the lid body 39, and rotating speed detecting means (a current measuring circuit 90) is provided for detecting the rotating speed Rt of the rotation body 78. When the rotating speed Rt of the rotation body 78 detected by the rotating speed detecting means 90 is reduced (Rt1) by a predetermined value from the set driving rotation speed RtO, the heating amount by the heating means 30 is reduced.

Description

  The present invention relates to a heating cooker such as a rice cooker or an electromagnetic cooker, and a cooking method thereof.

  This type of cooking device is provided with an inner pot having an upper end opening that accommodates food. The upper end opening of the inner pot is closed by a lid that can be opened and closed on the cooker body. And the cooked food in an inner pot is cooked by heating an inner pot with heating means, such as an induction heating coil and a heater arranged in a cooking appliance main part. During the cooking, the steam generated in the inner pot is exhausted outside through an exhaust passage provided in the lid.

  In the rice cooker which is one of the heating cookers, it is desired to increase the heating power in order to cook delicious cooked rice. However, the higher the heating power is, the more the bubble-like rice cake containing the rice component is contained in the exhausted steam, and the rice cake becomes easier to be discharged (spilled out) through the exhaust passage. Further, when the heating power is increased, the exhaust pressure increases due to the increase of steam, so that the release of the rice cake becomes more remarkable.

  Here, spilling does not occur if the amount of rice and water set in the inner pot is appropriate. However, when the amount of water is not appropriate for the amount of cooked rice, and when the rice cooking capacity is misidentified, the spillage is likely to occur. For example, when cooking 4 cups of cooked rice, if it is determined that the rice cooking capacity is 5 cups due to an error in the amount of water or the like, there is a high possibility of spilling.

  Therefore, in the rice cooker of Patent Document 1, in order to detect the rise of the rice bowl in the steam cylinder, there is a float that is arranged to freely roll the inclined portion, and a float detector that detects the movement of the float. In this configuration, the detection means is provided. And if it asks, it is set as the structure which controls the electric power supply amount to a bottom heating coil according to the detection state of a detection means.

  In the rice cooker of Patent Document 1, when the rice bowl rises in the steam cylinder, the float moves by this rice bowl. Therefore, it is judged that the rice bowl is produced by the rice bowl detection means, and heating by the bottom heating coil is performed. Since the amount is reduced, spillage can be reliably prevented. However, in other words, since cooking is performed with a heating power that does not cause spilling, ideal cooking cannot be performed.

  Moreover, in the rice cooker of patent document 2, in order to suppress effectively that a rice ball is discharge | released outside during rice cooking, the storage tank is provided in the exit part of the exhaust passage. This storage tank has an outside air intake hole and an exhaust hole, and a ventilation fan that takes in outside air from the outside air intake hole and exhausts it from the exhaust hole by arranging a turbo fan that is rotated by a motor behind the exhaust hole. A function is provided. Then, the steam containing the rice bowl discharged from the inner pot is stirred and cooled with the taken-in outside air, so that condensed water containing the rice bowl is stored in the storage section. Further, the rice balls collected in the storage section are returned to the inner hook through the female return holes.

  However, in order to prevent spilling with the rice cooker of Patent Document 2, the exhaust amount of steam generated in the inner pot is greatly affected. That is, when the exhaust amount of steam is small, it is considered that moisture in the steam can be condensed and dripped as designed. However, in this configuration, the heating amount of the inner pot cannot be increased. Conversely, if the amount of heating is high and the amount of steam exhausted is large, there is a high possibility that steam including rice balls will be exhausted to the outside together with ventilation by the turbofan. Therefore, it is extremely difficult to increase the heating amount of the inner pot while efficiently and reliably preventing spillage. Further, since the steam containing the rice cake is condensed by the outside air taken in, there is a problem that the dust contained in the outside air adheres to the rice cake and recirculates the dust together into the inner pot.

JP 11-262 A JP 2009-1000088 A1

  An object of the present invention is to provide a heating cooker and a cooking method thereof capable of heating an inner pot to the maximum while efficiently and reliably preventing spilling.

  In order to solve the above-mentioned problems, a heating cooker according to the present invention includes a cooker body having an inner pot disposed therein, and a lid body that is disposed in the cooker body so as to be openable and closable and closes an upper end opening of the inner pot. The inner pot is heated by heating means disposed in the cooker body, and the steam containing the cooked component generated in the inner pot is exhausted to the outside through an exhaust passage provided in the lid. However, in the cooking device for cooking the cooked food in the inner pot, the rotating body that is rotatably disposed near the outlet of the exhaust passage and breaks bubbles generated near the outlet of the exhaust passage, and the rotation A bubble destruction mechanism having a driving means for rotationally driving the body is provided in the lid body, and a rotational speed detecting means for detecting the rotational speed of the rotating body is provided, and the rotational speed of the rotating body detected by the rotational speed detecting means. From the set drive speed When the value reduced, has a configuration that reduces the amount of heating by the heating means.

  And the cooking method of this cooking-by-heating machine is the state which heated the said inner pot with the heating means in the state which obstruct | occluded the inner pot arrange | positioned in the main body of a cooking appliance with the cover body, On the other hand, the cooking material generated in the said inner pot The vapor containing the component is exhausted to the outside through the exhaust passage in the lid body, and the bubbles generated near the outlet of the exhaust passage are destroyed by rotating the rotating body constituting the bubble destruction mechanism by the driving means. On the other hand, when the rotational speed of the rotating body by the driving means is reduced by a predetermined value from the set driving rotational speed, the heating amount by the heating means is reduced.

Since this heating cooker can destroy the bubbles generated in the vicinity of the outlet of the exhaust passage by rotating the rotating body constituting the bubble destruction mechanism by the driving means, it can efficiently prevent the spilling. Therefore, since it is possible to apply a high heating power (heating amount) to the inner pot during cooking, it is possible to increase the degree of freedom when creating a cooking program and to cook deliciously.
In addition, steam containing rice balls has a higher viscosity than normal steam. Therefore, when the rice cake is discharged to the vicinity of the outlet of the exhaust passage, the rice cake adheres to the rotating body, thereby reducing the rotational speed of the rotating body. And if the rotation speed of a rotary body reduces, since the amount of heating by a heating means will be reduced, a spill can be prevented reliably.
That is, in the present invention, the bubble destruction mechanism prevents the spilling from the exhaust port to the maximum, but if the spilling is still likely to occur, the heating power is reduced, so the inner pot is heated to the maximum, Cooking can be done with typical firepower.

In this heating cooker, it is preferable that the heating amount by the heating unit is increased when the rotation number of the rotating body detected by the rotation number detection unit increases by a predetermined value after the heating amount by the heating unit is decreased. In this way, the inner pot can be heated to the maximum without causing spillage.
In this case, it is preferable that the reduction value of the rotation speed of the rotating body that decreases the heating amount by the heating means is larger than the increase value of the rotation speed of the rotating body that increases the heating amount by the heating means. That is, as soon as there is no possibility of spilling, the heating power by the heating means is increased, so that a large amount of heating power can be applied to the inner pot.

  Further, it is preferable that the rotational speed detection means detects the rotational speed of the rotating body based on an energization amount to the driving means. If it does in this way, it can detect, without detecting the number of rotations of a rotating body directly. Therefore, it is possible to realize a configuration in which the outlet portion of the exhaust passage is configured with a detachable steam port set, and the rotating body is disposed in the steam port set. And by setting it as this structure, the exit part and rotary body of the exhaust passage to which the rice cake adhered can be easily cleaned.

  In the present invention, the bubbles generated near the outlet of the exhaust passage can be destroyed by rotating the rotating body by the driving means. Further, if the number of rotations of the rotating body decreases due to the sticking to the rotating body, the heating amount by the heating means is reduced. In other words, the bubble destruction mechanism prevents the spilling from the exhaust port to the maximum while reducing the heating power when the spilling is likely to occur. Cooking can be done.

It is a fragmentary sectional view which shows the rice cooker which is a heating cooker of embodiment of this invention. It is a disassembled perspective view which shows an inner hook and a protective frame. (A), (B) is sectional drawing which shows the mounting process of the inner hook to a protective frame. FIG. 2 is an exploded cross-sectional view of a main part of FIG. 1. (A) is a disassembled perspective view of a steam port set, (B) is a perspective view which shows the state which open | released the steam port set. (A) is a block diagram which shows the structure of a rice cooker, (B) is a chart which shows the electricity supply control in a boiling maintenance process. It is a graph which shows the relationship between the electricity supply control at the time of a rice cooking process, and the rotation speed of a rotary body. It is a flowchart which shows control of the boiling maintenance process by a microcomputer.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a rice cooker that is a heating cooker according to an embodiment of the present invention. This rice cooker is rotatable to the inner cooker 10 that contains cooked rice with water, the rice cooker body 13 (cooker body) that houses the inner pot 10, and the rice cooker body 13. And an attached lid 39. And the rice cooker of this embodiment arrange | positions the blade | wing member 78 for preventing a spill over in the exit part of the exhaust passage formed in the cover body 39, and guide | induces based on the rotation speed Rt of this blade | wing member 78. The heating amount of the heating coil 30 is increased or decreased.

  Specifically, as shown in FIGS. 1 and 2, the inner hook 10 is formed by casting a metal material such as iron or the like, and is vortexed by a magnetic field generated by flowing a high-frequency current through the induction heating coil 30. Induction heating is caused by the flow of current. The inner hook 10 has a substantially inverted conical cylindrical shape with a bottom, and a first positioning portion 11 including a flange portion protruding radially outward is provided at an upper end thereof. The lower side of the first positioning portion 11 constitutes a placement surface placed on the first receiving portion 19 formed at the upper end of the accommodating portion 14. Further, the inner hook 10 is provided with a second positioning portion 12 projecting radially outward at an intermediate position between the upper end provided with the first positioning portion 11 and the lower portion heated by the induction heating coil 30. It has been. The second positioning portion 12 is formed in an annular shape having an outer diameter smaller than the outer diameter of the first positioning portion 11, and the lower side having a step shape is placed on a second receiving portion 25 formed in the accommodating portion 14. The mounting surface is configured.

  The rice cooker body 13 has a cylindrical body 15 made of a metal (SUS430) having upper and lower ends opened, a shoulder body 16 that closes the upper end opening of the body 15, and a bottom body 21 that closes the lower end opening of the body 15. The exterior body which has this. In the exterior body, a housing portion 14 is formed by a part of the shoulder body 16, the inner body 22 and the protective frame 23, and the inner hook 10 is detachably housed in the housing portion 14.

  As shown in FIG. 1, the shoulder body 16 constitutes the upper portion of the exterior body and is attached by being fitted into the upper end opening of the body 15. On the back side of the shoulder body 16, there is provided a hinge connection portion 17 for rotatably mounting the lid body 39. In addition, an operation panel portion 18 is formed on the shoulder body 16 on the front side located on the left side in FIG. Furthermore, the shoulder body 16 is provided with an opening serving as an upper end opening of the accommodating portion 14, and the upper end of the opening constitutes a first receiving portion 19 that receives the first positioning portion 11 of the inner hook 10. Further, around the opening of the shoulder body 16, there is provided an inner cylinder mounting portion 20 that protrudes downward so as to form a cylindrical shape. The bottom body 21 constitutes the lower portion of the exterior body, and is attached by being fitted into the lower end opening of the body 15.

  The inner body 22 is made of a metal cylindrical member, and constitutes an accommodating part 14 that is continuous with the opening of the shoulder body 16 by being fitted and attached to the inner body mounting part 20 of the shoulder body 16.

  The protective frame 23 is made of a resin that is a non-conductive material, and is disposed so as to cover the lower end opening of the inner cylinder 22, thereby constituting a lower half region of the accommodating portion 14. The protective frame 23 has a tray shape, and a center sensor mounting portion 24 for detecting the temperature of the bottom portion of the inner hook 10 is provided at the center of the bottom. In addition, a second receiving portion 25 that receives the second positioning portion 12 of the inner hook 10 is provided inside the protective frame 23. The second receiving portion 25 is provided with a mounting hole 26 for mounting a contact member 34 that receives the intermediate layer heater 33. On the outer peripheral edge of the second receiving part 25, an inner cylinder receiving part 27 is provided which receives the outer peripheral part of the lower end of the inner cylinder 22 by fitting. The inner trunk receiving portion 27 includes guide ribs 28 protruding inward. A bracket portion 29 for fixing the boss protruding from the bottom body 21 by screwing is provided on the outer peripheral portion of the inner trunk receiving portion 27.

  As shown in FIG. 1, an induction heating coil 30 is fixed to the outer surface of the protective frame 23 via a ferrite core 31. This induction heating coil 30 is a first heating means for induction heating the bottom of the inner pot 10. The ferrite core 31 converges the magnetic field generated from the induction heating coil 30 and is fixed to the protective frame 23 by screws. At the center of the bottom of the protective frame 23, a bottom temperature sensor 32 is disposed on the center sensor mounting portion 24 of the protective frame 23 as first temperature detecting means for detecting the bottom temperature of the inner hook 10. .

  Further, an intermediate layer heater 33 is disposed inside the protective frame 23 of the present embodiment as a second heating means for directly heating the second positioning portion 12 that is an intermediate layer of the inner hook 10. The intermediate layer heater 33 is composed of a linear heater disposed inside an annular contact member 34 disposed on the second receiving portion 25 of the protective frame 23 so as to be movable in the vertical direction.

  As shown in FIG. 2 and FIGS. 3A and 3B, the contact member 34 includes a resin frame having a substantially inverted U-shaped cross section, and a heat transfer made of metal (aluminum) on the upper surface thereof. The member 35 is disposed. A guide groove 36 corresponding to the guide rib 28 is provided on the outer peripheral portion of the contact member 34. The contact member 34 is provided with a mounting member 37 at a position corresponding to the mounting hole 26 of the protective frame 23. The mounting member 37 is biased in a downward projecting direction by a spring (not shown) disposed in the contact member 34. The upward movement of the contact member 34 by the spring is stopped by contacting the lower end of the inner cylinder 22 located on the upper side.

  In the present embodiment, the intermediate layer heater 33 is provided as the second heating means for heating the intermediate layer of the inner hook 10, but in order to ensure the heating amount of the intermediate layer of the inner hook 10, A body heater 38 is further disposed outside the 22 as a third heating means for heating the upper layer of the outer peripheral portion of the inner hook 10 through the space in the accommodating portion 14.

  As shown in FIGS. 1 and 4, the lid 39 includes an exterior body having an upper plate 40 and a lower plate 41 and covers the upper portion of the rice cooker body 13. The back side of the lower plate 41 constituting the lid 39 is attached to the hinge connection portion 17 of the rice cooker body 13 so as to be opened and closed. An opening operation member 42 for opening the lid 39 is disposed on the front side of the upper plate 40, and a lock mechanism (not shown) is disposed therein. The lid 39 includes a heat radiating plate 43 on the lower surface of the lower plate 41 that covers the inner hook 10. On the heat radiating plate 43, a lid heater 44 is disposed as a fourth heating means for heating the upper portion of the inner hook 10, and as a second temperature detecting means for detecting the temperature of the air layer above the inner hook 10. A lid temperature sensor 45 is provided.

  An inner lid 46 that closes the upper end opening of the inner hook 10 is detachably disposed on the inner side surface of the lid 39. The inner lid 46 is made of metal, and has a seal member 47 that seals the inner peripheral portion of the upper end opening of the inner hook 10 on the outer peripheral portion thereof. The inner lid 46 is provided with a well-known pressure input mechanism (relief valve) (not shown). This pressure input mechanism is capable of increasing the pressure inside the inner hook 10 to a pressure higher than the atmospheric pressure, and is disposed in the bulging portion 49 constituting the exhaust passage. The pressure input mechanism includes a spherical member capable of communicating and blocking the exhaust passage, and the spherical member is moved by a solenoid disposed on the lower plate 41. When the solenoid is off, the spherical member is moved away from the vent hole so that the exhaust passage is in communication. Further, when the solenoid is on, the spherical member is rolled onto the vent hole to block the exhaust passage, and when the pressure in the inner hook 10 exceeds an allowable value, the exhaust passage is brought into a communication state by the vapor pressure.

  The lid 39 is formed with an exhaust passage for exhausting steam generated inside the inner hook 10 to the outside. In this exhaust passage, a communication portion 48 provided substantially in the center of the inner lid 46 constitutes an inlet, and this communication portion 48 communicates with the inside of a bulging portion 49 provided in the lower plate 41, The lower end communicates with the gap 50 between the heat sink 43 and the inner lid 46. The gap 50 communicates with a steam port set 57 that is detachably disposed on the upper plate 40 through a ventilation portion 51 provided on the back side of the heat radiating plate 43 and a connection portion 52 provided on the lower plate 41. To do. The ventilation part 51 and the connection part 52 are hermetically sealed by a packing 53. Further, the upper plate 40 is provided with a disposition recess 54 in which the steam port set 57 is disposed, and a communication hole 55 communicating with the connection portion 52 is provided in the disposition recess 54. The communication hole 55 and the connection portion 52 are sealed with a packing 56. That is, in the present embodiment, the path passing through the communication portion 48 facing the inside of the inner pot 10, the bulging portion 49, the gap portion 50, the ventilation portion 51, and the steam port set 57 constitutes an exhaust passage.

  The steam port set 57 constitutes an outlet portion of the exhaust passage. As shown in FIGS. 4 and 5A and 5B, the upper cover 69 is hingedly connected to the lower container 58 so as to be rotatable and detachable. It is a thing.

  The lower container 58 has a tray shape and includes an insertion portion 59 that is inserted into the communication hole 55 and sealed by the packing 56. A cylindrical inflow port portion 60 that protrudes upward is provided on the upper portion of the insertion portion 59. A part of the outer peripheral wall is penetrated along the axial direction in the inflow port portion 60, steam is introduced from the through groove, and condensed water including a rice cake is returned to the inner pot 10. Further, the lower container 58 is provided with a hinge connection portion 61 for rotatably assembling the upper cover 69 on the outer peripheral portion on the back side. Further, a lock member 62 that is movable toward the back side is disposed on the front side outer peripheral portion that faces the front side. The lock member 62 keeps the upper cover 69 closed by a lock claw portion 63 provided above.

  On the inner back side of the lower container 58, an arrangement step portion 64 of the bubble destruction mechanism 77 is provided that is mounted on the lid 39 and is located above the motor 85. The arrangement step portion 64 has a fan-like shape in a plan view, and an outer frame 65 protruding upward is provided on the outer peripheral portion thereof. A protective cover 66 is provided at the center of the outer frame 65. The protective cover 66 is provided so as to bulge upward in the exhaust passage so as to form a cross-shaped frame shape in plan view. A support portion 67 that rotatably supports the blade member 78 is provided at the intersecting central portion of the protective cover portion 66. Further, a vent hole 68 communicating with the inside of the protective cover portion 66 is provided on the front side surface of the outer frame 65.

  The upper cover 69 has the same outer shape as the upper plate 40 of the lid 39 in a state where the steam port set 57 is arranged in the arrangement recess 54. The upper cover 69 is provided with a fitting groove 70 that fits into the upper end opening of the lower container 58, and a packing 71 is disposed in the fitting groove 70. Further, the upper cover 69 is provided with a fitting frame portion 72 that is externally fitted to the arrangement step portion 64. In the fitting frame portion 72, side plate portions 73 that overlap with both side plates of the protective cover portion 66 are further provided, and an exhaust port 74 that is an exhaust passage outlet is provided therebetween. Further, the upper cover 69 is provided with a connecting portion 75 connected to the hinge connecting portion 61 of the lower container 58 on the back side, and provided with a locked portion 76 that is locked to the locking member 62 on the front side. .

  The bubble destruction mechanism 77 is disposed in the arrangement step portion 64 of the steam port set 57 in the vicinity of the outlet of the exhaust passage. The bubble breaking mechanism 77 includes a blade member 78 that is rotatably arranged on the arrangement step portion 64, and a motor 85 that is a driving unit that rotationally drives the blade member 78.

  The vane member 78 is broken by contact with the air bubbles directed to the exhaust port 74 by being rotated by the motor 85, and collides with the wall surface of the steam port set 57 by blowing air from the exhaust port 74 in a direction other than the exhaust direction. It is a rotating body that destroys it. The blade member 78 is attached to the protective cover 66 from the outside (lower) side of the exhaust passage, and includes a blade member main body 79, a first magnetic member 82, and an assembly substrate 83.

  The blade member main body 79 is made of resin and includes a shaft portion 80 that is rotatably supported by the support portion 67 of the protective cover portion 66. On the outer periphery of the shaft portion 80, four blade portions 81 are projected at equal intervals. The first magnetic member 82 constitutes a non-contact type connecting portion with the motor 85 and is disposed on the lower surface of the blade member main body 79. The first magnetic member 82 is composed of magnets arranged so that the south pole and the north pole are alternately positioned in the circumferential direction, and can be rotated in conjunction with a second magnetic member 88 described later due to the difference in the magnetic poles. Is. The assembly board 83 rotatably supports the blade member main body 79 between the support part 67 and closes the lower end opening of the protective cover part 66, and is an insertion hole through which a special screw (not shown) is inserted. 84 is provided.

  The motor 85 is a DC motor in which the rotation speed of the output shaft 86 is set in proportion to the applied voltage. When the same voltage is applied to the motor 85, when the torque (load) increases, the rotational speed of the output shaft 86 decreases accordingly, while the energized current increases proportionally. The drive rotational speed Rt0 of the motor 85 of this embodiment is set by the drive circuit 87 so as to be a high speed rotational speed. The output shaft 86 of the motor 85 is disposed on the lower plate 41 so as to be positioned on the same axis as the shaft portion 80 of the blade member 78 disposed in the disposition step portion 64. That is, the motor 85 is disposed in the lid body 39 constituted by the upper plate 40 and the lower plate 41. The output shaft 86 of the motor 85 is provided with a second magnetic member 88 that constitutes a non-contact connection portion. Similar to the first magnetic member 82, the second magnetic member 88 is composed of magnets arranged so that the S poles and the N poles are alternately positioned.

  In this rice cooker, a control board (not shown) is disposed in the rice cooker body 13. A microcomputer 89 as control means is mounted on the control board. As shown in FIG. 6, the microcomputer 89 performs heating (energization) control of the induction heating coil 30, the intermediate layer heater 33, the body heater 38 and the lid heater 44 in accordance with a program stored in advance, and performs preheating and temperature rising (medium). A rice cooking (cooking) process is performed through each process such as boiling), boil maintenance, and spotting, and a heat retaining process is performed to keep the cooked cooked rice at a predetermined temperature.

  In addition, the microcomputer 89 rotates the blade member 78 via the motor 85 in a process in which a large amount of steam containing rice components is generated inside the inner pot 10. When the bubbles generated in the inner hook 10 are discharged to the vicinity of the exhaust port 74 through the exhaust passage, or when the bubbles generated in the exhaust passage are discharged to the vicinity of the exhaust port 74, the blade member 78. The bubbles are destroyed by abutting with. Alternatively, the air bubbles are collided with the wall surface of the steam port set 57 by the radially outward blowing by the blade portion 81 of the blade member 78 and destroyed. Thereby, it is set as the structure which prevents the spill from the exhaust port 74.

  Further, the microcomputer 89 detects whether or not the blade member 78 is rotating at the set drive rotational speed Rt0 by the current measuring circuit 90 as the rotational speed detecting means, and reduces the drive rotational speed Rt0 by a predetermined value (low speed). The number of rotations Rt1) and the heating amount by the induction heating coil 30 are reduced. Further, when the number of rotations of the blade member 78 increases by a predetermined value after the heating amount is decreased (medium speed rotation number Rt2), the heating amount by the induction heating coil 30 is increased and returned to the normal set heating amount. The current measurement circuit 90 connects a resistor 91 having a very small resistance value for current measurement to the motor 85, amplifies the voltage applied to both ends of the resistor 91 by an operational amplifier, and outputs the amplified voltage to the microcomputer 89.

  In the present embodiment, the step of operating the bubble destruction mechanism 77 is a boiling maintenance step. The induction heating coil 30 in this boiling maintenance process is controlled with an energization rate of 80% and for each rice cooking capacity determined in the previous temperature raising process, as shown in FIG. 6 (B). ing. In the case of 1 cup, an energization rate of 3/15, that is, a cycle of turning on for 3 seconds in 15 seconds and turning off for 12 seconds is repeated. In the case of 2 cups, heating is performed at an energization rate of 5/15. In the case of 3 cups, heating is performed at a current rate of 7/15. In the case of 4 cups, heating is performed at an energization rate of 9/15. In the case of 5 cups, heating is performed at an energization rate of 11/15.

  When the microcomputer 89 detects that the blade member 78 has been reduced to the low speed Rt1 via the current measurement circuit 90, the induction heating coil 30 is reduced to 1/15 in the energization rate (heating amount) in the case of 1 cup. In the case of 2,3 cups, the current ratio is reduced to 2/15, and in the case of 4,5 cups, the current ratio is decreased to 3/15. Thereafter, when it is detected via the current measurement circuit 90 that the blade member 78 has increased to the medium speed rotation speed Rt2, the induction heating coil 30 is increased to a normal energization rate. Thus, in this embodiment, the reduction value (Rt0-Rt1) that decreases the heating amount is larger than the increase value (Rt2-Rt1) that increases the heating amount.

  When the user uses the rice cooker, the lid 39 is opened and the inner pot 10 is taken out in a standby state in which neither the rice cooking process nor the heat retaining process is performed. In a state where the inner pot 10 is taken out from the accommodating portion 14 of the rice cooker main body 13, as shown in FIG. 3A, the contact member 34 disposed in the second receiving portion 25 moves upward, and the inner drum 22 is moved. It is in contact with the lower end. In this state, there is no gap for foreign matter such as cooked rice to enter between the upper end and the bottom of the accommodating portion 14.

  Then, after a predetermined amount of cooked rice and water is set in the inner pot 10, the user attaches it to the accommodating portion 14 of the rice cooker body 13. At this time, as shown in FIG. 3B, the second positioning portion 12 contacts the contact member 34, and the contact member 34 moves downward with the weight of the inner hook 10. Thereafter, the first positioning portion 11 contacts the first receiving portion 19 at the upper end of the accommodating portion 14, and the second positioning portion 12 contacts the second receiving portion 25 in the accommodating portion 14 via the abutting member 34. Make a state.

  In this accommodated state, the load of the inner hook 10 is distributed by the first and second receiving portions 19 and 25 by the first and second positioning portions 11 and 12. Therefore, the rigidity required for the receiving portions 19 and 25 of the accommodating portion 14 can be reduced. Further, the inner hook 10 can be housed in the housing 14 in a stable state as designed. Therefore, not only the heating by the intermediate layer heater 33 but also the uneven heating by the induction heating coil 30, the body heater 38 and the lid heater 44 can be suppressed.

  Next, the rice cooking process by the microcomputer 89 will be specifically described.

  When the rice cooking process is executed by operating the operation panel unit 18, the microcomputer 89 executes a preheating process as shown in FIG. 7. In this preheating step, the induction heating coil 30 and the lid heater 44 are energized at a predetermined energization rate, and the temperature is adjusted (on / off control) so that the temperature detected by the bottom temperature sensor 32 is about 40 ° C. And if the transition time according to the selected rice cooking menu passes, the next temperature rising process and capacity | capacitance discrimination | determination process will be processed in parallel.

  In the temperature raising step, after performing the first temperature raising step of continuously energizing the induction heating coil 30, the intermediate layer heater 33, and the lid heater 44 with full power, only the induction heating coil 30 is energized to about 80%. A second temperature raising step that suppresses and continues energization is performed. In the capacity determination step, the process proceeds to the second temperature raising step and waits until the temperature detected by the bottom temperature sensor 32 reaches the first set temperature T1, and when the temperature reaches the first set temperature T1, the temperature rises to the second set temperature T2. Measure the time to complete. Then, the rice cooking capacity is determined from the measured time and the stored capacity determination value. Then, when the temperature detected by the bottom temperature sensor 32 reaches about 100 ° C., the process proceeds to the boiling maintenance process which is the next process.

  In a boiling maintenance process, while setting the electricity supply rate of the induction heating coil 30 according to rice cooking capacity, the other heaters 33, 38, and 44 are made into the electricity supply rate of 100%, and the inner pot 10 is heated. Further, the energization rate of the induction heating coil 30 is increased or decreased according to the rotation speed Rt of the blade member 78. Then, when dry-up is detected from the detection value Ts of the bottom temperature sensor 32, the process proceeds to the unevenness process. In addition, this boiling maintenance process is demonstrated in detail later.

  In the unevenness process, the energization rates and the transition times of all the heating means 30, 33, 38, and 44 are set according to the set rice cooking menu and the determined rice cooking capacity. And if the set transition time passes, all the processes of a rice cooking process will be complete | finished and it will transfer to a heat retention process.

  In the boiling maintenance process, as shown in FIG. 8, the microcomputer 89 first reads the current rice cooking capacity determined in the capacity determination process in step S1. Next, in step S2, the energization rate of the induction heating coil 30 is set based on the rice cooking capacity, and energization is started including the other heaters 33, 38, and 44. In addition, energization of the intermediate layer heater 33 and the lid heater 44 is also started. In step S3, energization of the motor 85 is started and the blade member 78 is rotated at a high speed drive rotational speed Rt0.

  Next, in step S4, it is detected whether or not the flag f indicating whether or not the energization rate of the induction heating coil 30 is reduced is 0 (normal setting). If f is 0, the process proceeds to step S5, and if f is 1 (decrease setting), the process proceeds to step S8.

  In step S5, it is detected whether or not the rotational speed Rt of the blade member 78 has been reduced to the low speed rotational speed Rt1 or less via the current measuring circuit 90. If Rt ≦ Rt1, the process proceeds to step S6, and if Rt> Rt1, the process proceeds to step S11. In step S6, the energization rate to the induction heating coil 30 is reduced according to the rice cooking capacity. Thereafter, in step S7, 1 is input to f, and the process proceeds to step S8.

  In step S8, it is detected via the current measurement circuit 90 whether or not the rotational speed Rt of the blade member 78 has increased to the medium speed rotational speed Rt2 or more. If Rt ≧ Rt2, the process proceeds to step S9, and if Rt <Rt2, the process proceeds to step S11. In step S9, the energization rate to the induction heating coil 30 is increased to the normal set value according to the rice cooking capacity. Thereafter, in step S10, 0 is input to f, and the process proceeds to step S11.

  In step S11, it is detected whether or not the detected temperature Ts of the bottom temperature sensor 32 is equal to or higher than the dry-up temperature Ts1. If Ts <Ts1, the process returns to step S4, and the increase / decrease in the energization rate of the induction heating coil 30 based on the rotational speed Rt of the blade member 78 is repeated. Further, when Ts ≧ Ts1, the process proceeds to step S12, where the energization to the motor 85 is interrupted and the rotation of the blade member 78 is stopped.

  Thus, in the rice cooker of the present invention, the blade member 78 constituting the bubble destruction mechanism 77 is rotated by the motor 85 so that the bubbles generated near the outlet of the exhaust passage are brought into contact with or collided with the wall surface. Since it can be destroyed, it is possible to efficiently prevent spillage. Therefore, it is possible to apply a high heating power to the inner pot 10 even in the boiling maintenance process in which the amount of heating is suppressed so as not to cause spillage. As a result, the degree of freedom in creating a cooking program can be increased, and delicious and ideal cooking rice can be realized.

  In addition, steam containing rice balls has a higher viscosity than normal steam. Therefore, when the rice cake is discharged to the vicinity of the outlet of the exhaust passage, the rice cake adheres to the blade member 78, thereby reducing the rotational speed Rt0 of the blade member 78. When the blade member 78 is reduced to the low speed Rt1, the amount of heating by the induction heating coil 30 is reduced, so that it is possible to reliably prevent spillage.

  In other words, in the present invention, the bubble destruction mechanism 77 prevents the spilling from the exhaust port 74 to the maximum, while the thermal power is reduced when the spilling is likely to occur. Moreover, when the blade member 78 increases to the medium speed rotation speed Rt2 after the heating amount is reduced, the heating amount by the induction heating coil 30 is increased. Further, the reduction value (Rt0−Rt1) of the blade member 78 that decreases the heating amount is set larger than the increase value (Rt2−Rt1) of the blade member 78 that increases the heating amount. That is, the thermal power is increased as soon as there is no possibility of spilling. Therefore, since it can heat to the maximum so that many thermal powers may be added to the inner pot 10, rice can be cooked with an ideal thermal power.

  Further, the rotational speed Rt of the blade member 78 is detected not by directly detecting the blade member 78 but by a current supplied to the motor 85. Therefore, it is possible to realize a configuration in which the outlet portion of the exhaust passage is configured by the removable steam port set 57 and the blade member 78 is disposed in the steam port set 57. And by setting it as this structure, since the exit part and the blade member 78 of the exhaust passage to which the rice stick adhered can be easily cleaned, it is hygienic.

  Furthermore, the rice cooker of this embodiment can directly heat the intermediate layer of the inner pot 10 by the intermediate layer heater 33. Therefore, since sufficient heating can be applied to the intermediate layer of the inner pot 10, the inner pot 10 can be heated uniformly from the upper layer to the lower layer, and ideal rice cooking can be performed while preventing uneven cooking. Moreover, since the second positioning portion 12 of the inner hook 10 is formed in an annular shape, the lower portion from the second positioning portion 12 can be substantially sealed in the accommodating portion 14. Thereby, since the heat radiation outside the lower portion of the inner pot 10 can be suppressed, the heating efficiency can be improved and the power consumption can be reduced.

  In addition, the heating cooker and its cooking method of this invention are not limited to the structure of the said embodiment, A various change is possible.

  For example, in the above-described embodiment, the detection means for the rotational speed Rt of the blade member 78 is configured by the current measuring circuit 90 that detects the amount of current to the motor 85, but the detected member is disposed on the output shaft 86, and the lead The detection may be performed using elements such as a switch, a microswitch, and a photocoupler.

  In the above-described embodiment, the first threshold value (Rt1) for reducing the heating amount and the second threshold value (Rt2) for increasing the heating amount are set, and the heating amount is set to a value lower than the normal setting value. Although the configuration is such that two types of heating set values are switched, it may be configured such that the threshold value and the set value are set in multiple stages and can be increased or decreased in multiple stages.

  Furthermore, in the said embodiment, although the rice cooker was mentioned as an example as a heating cooker of this invention, if it is a heating cooker which a bubble passes in the exhaust passage at the time of cooking, such as an electromagnetic cooker, any Application is possible, and similar actions and effects can be obtained.

10 ... Inner pot 13 ... Rice cooker body (cooker body)
30 ... induction heating coil (first heating means)
33. Intermediate layer heater (second heating means)
38 ... Body heater (third heating means)
39 ... Lid 44 ... Lid heater (fourth heating means)
48 ... Communication part (exhaust passage)
49 ... bulge part (exhaust passage)
50. Gap (exhaust passage)
51. Ventilation part (exhaust passage)
52 ... Connection part (exhaust passage)
57 ... Steam port set (exhaust passage)
77 ... Bubble destruction mechanism 78 ... Blade member (rotating body)
82 ... 1st magnetic member (non-contact type connection part)
85: Motor (drive means)
87 ... Drive circuit 88 ... Second magnetic member (non-contact coupling part)
89 ... Microcomputer (control means)
90 ... Current measuring circuit (rotation speed detecting means)

Claims (5)

A cooking device body having an inner pot disposed therein, and a heating means disposed in the cooker body, the lid having a lid body that can be opened and closed on the cooker body and closes an upper end opening of the inner pot. The heating cooker for cooking the food in the inner pot while heating the inner pot by the above and exhausting the steam containing the cooked component generated in the inner pot to the outside through the exhaust passage provided in the lid In
An air bubble breaking mechanism including a rotating body that is rotatably disposed near an outlet of the exhaust passage and breaks bubbles generated near the outlet of the exhaust passage, and a driving unit that rotationally drives the rotating body. And a rotational speed detection means for detecting the rotational speed of the rotating body,
The cooking device according to claim 1, wherein when the rotational speed of the rotating body detected by the rotational speed detection means is reduced by a predetermined value from the set drive rotational speed, the heating amount by the heating means is reduced.   The heating amount by the heating means is increased when the rotation number of the rotating body detected by the rotation number detection means increases by a predetermined value after the heating amount by the heating means is reduced. The cooking device described.   The reduction value of the rotation speed of the rotating body that decreases the heating amount by the heating means is larger than the increase value of the rotation speed of the rotating body that increases the heating amount by the heating means. Cooking device.   The cooking device according to any one of claims 1 to 3, wherein the rotation number detection unit detects the rotation number of the rotating body based on an energization amount to the driving unit. While the inner pot disposed in the cooker body is closed with a lid, the inner pot is heated by heating means,
A rotating body that constitutes a bubble destruction mechanism is used to exhaust steam containing cooked product components generated in the inner pot to the outside through the exhaust passage in the lid body, and to remove bubbles generated near the outlet of the exhaust passage. While destroying by rotating by the driving means,
The cooking method of the heating cooker, wherein the heating amount by the heating unit is reduced when the rotation number of the rotating body by the driving unit is reduced by a predetermined value from the set driving rotation number.

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