JP2018130321A - Heating/agitating cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heating/agitating cooker which can keep action of agitating a cooked object in a container and furthermore can stably agitate the cooked object adaptably to load fluctuation applied to an agitating body for use in agitation.SOLUTION: The heating/agitating cooker comprises: a container 2 capable of storing a cooked object; a storage container part 3 storing the container; and an agitating body 6 agitating a cooked object in the container. The agitating body comprises: a blade part 10 agitating a cooked object; and a permanent magnet 7 capable of receiving a rotating magnetic field from outside. The storage container part comprises: a rotating magnetic field generation part 11 generating a rotating magnetic field with respect to the permanent magnet; a rotating magnetic field control part 50 controlling the rotating magnetic field generation part; and heating means 4 heating the container. The rotating magnetic field generation part comprises: a device side permanent magnet 12 facing the permanent magnet relative to a magnetic field thereof; and a rotation drive part 14. The heating/agitating cooker further comprises near the device side permanent magnet, a detection part detecting a magnetic coupling state between the permanent magnet and device side permanent magnet.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a heating and stirring cooker including a stirring body for stirring an object to be cooked accommodated in a container to be heated. Specifically, the present invention relates to a heating and stirring cooker provided with a stirring body that is disposed in a container and rotates by receiving a rotating magnetic field from the outside of the container.

  Conventionally, a rotating magnetic field is generated by the rotary drive device of the rice cooker body against the driven side magnet of the stirring body that is rotatably provided in the cooker for cooking rice, and the stirring body is contacted by magnetic coupling. An electric rice cooker that is driven to rotate has been proposed (see, for example, Patent Document 1).

  Further, there has been proposed a rotary heating cooker that heats a pan placed on top by a magnetic field generated from a coil provided in an induction heating cooker and that rotates a rotary blade having a permanent magnet or a magnetized body ( For example, see Patent Document 2).

  FIG. 18: is sectional drawing which shows the electric rice cooker which is the conventional rotary heating cooker described in patent document 1. As shown in FIG. According to Patent Document 1 shown in FIG. 18, there is no need for the rotational drive device 102 for rotationally driving the stirrer 101 to penetrate the rice cooking pot 103, so there is no fear of water leaking from the penetration location. It is comprised so that a thing may be stirred.

  According to Patent Document 2, a rotary heating cooker that does not burn the object to be cooked even if it is not regularly stirred with a rice scoop or the like, and can be used in combination with other rotary cookers, and requires less storage space for equipment. Is intended to provide. FIG. 19 shows a conventional rotary heating cooker described in Patent Document 2, in which a coil 203 divided into a plurality of parts connected to an inverter 202 housed in a main body 201 has a high-frequency magnetic field according to the output of the inverter 202. Alternatively, a low frequency magnetic field or a mixed magnetic field is generated, and a pan 206 formed of a nonmagnetic metal having a rotor blade 205 having a magnet 204 therein is placed on the coil 203 to heat and rotate the pan 206. Both rotations of the wing 205 are performed.

  On the other hand, in the stirring device using a magnetic coupling, the structure of patent documents 3-5 is proposed as a means to detect the rotation operation of a stirring body.

  In the configuration of Patent Document 3, a stirring member integrally formed with a driven magnet that rotates in a stirring space having a stirring blade, and a stirring member that rotates coaxially along the outer periphery of a container that forms the stirring space. In the rotary drive member in which the drive side magnet is integrally formed, the magnetic coupling configuration performs rotation transmission by the magnetic attractive force between the driven side magnet and the drive side magnet, and is provided at both ends of the stirring body in the rotation axis direction. On the other hand, a detector comprising a permanent magnet is disposed at a position deviated from the center of rotation, and a sensor for detecting the position of the detector in response to the magnetism of the detector is provided. According to Patent Document 3, the rotation speed of the stirring member is detected by this detection means, and the rotation speed is controlled based on the detection result, so that optimum mixing can be obtained.

  In addition, the configuration of Patent Document 4 includes a stirring rotor set at the bottom of a container, and a driving magnet that is rotationally driven by a driving source below the container, and a magnetic shield on the outer periphery of the driving magnet. A plurality of magnetic detection sensors for detecting the magnetism of the stirring rotor are connected by a parallel circuit. According to Patent Document 4, the position of the separated stirring rotor can be detected, and the drive magnet can be reversely controlled to return the stirring rotor to the original position.

FIG. 20 is a cross-sectional view showing a conventional stirring device described in Patent Document 5. FIG.
The configuration of Patent Document 5 shown in FIG. 5 includes a driving device for arranging a magnetic operating body 302 on the bottom wall of a container 301 having a nonmagnetic bottom wall and rotating the magnetic operating body 302 to the lower outside of the bottom wall of the container 301. 303 is provided, and the driving device 303 is supported via a force sensor 304, and the apparent weight of the driving device 303 is continuously monitored, whereby the magnitude of the magnetic force between the magnetic operating body 302 and the driving device 303 is increased. This is to detect the thickness. According to Patent Document 5, this detection means can indicate that the magnetic operating body 302 starts to be not interlocked in a blind state, and can subsequently indicate that it is not completely interlocked.

JP 2011-229612 A JP-A-8-35664 Japanese Patent No. 5388719 Japanese Patent No. 4340343 Japanese Patent No. 4568411

  However, in the configuration (magnetic coupling) in which power is transmitted by a rotating magnetic field as in Patent Documents 1 and 2, the degree of magnetic coupling generally decreases as the magnetic gap (gap length) increases. Even if the rotation of the driven-side magnetic coupling is locked due to foreign matter or the like being caught between the magnetic gaps, the drive-side magnetic coupling continues to rotate. Since the repulsive force between the magnetic couplings increases by approaching the pole, the stirrer will step out of the rotating magnetic field and the stirring operation becomes impossible. A means for detecting a stirrer is required. However, in the case of the configurations of Patent Documents 3 and 4, it is a configuration that can be detected after the stirrer has stepped out. In the case of a heating cooker, if the stirrer has stepped out, the stirrer is suppressed by the object to be cooked. It is difficult to return to the original position of the rotating magnetic field. Further, in the case of the configuration of Patent Document 5, the apparent weight of the driving device changes due to the repulsive force generated between the magnetic couplings, so that it is possible to detect immediately before the stirrer is out of step. The support structure in which the apparatus is movable and the structure for detecting the weight of the driving device and the problem that the structure becomes complicated and the heating cooker becomes large arise.

  The present invention solves the above-described conventional problems, and a magnetic cup that transmits a high torque power in a non-contact manner by applying a rotating magnetic field from the outside of a container to an agitator that stirs an object to be cooked accommodated in the container. It is an object of the present invention to provide a heating and stirring cooker having a ring and detecting a coupled state of rotating magnetic fields with a minimum part configuration and continuing a stable stirring operation.

In order to solve the conventional problem, the heating and stirring cooker according to the present invention includes:
A container that has an inner bottom part and an inner peripheral part capable of storing a food to be cooked, generates heat by receiving heat from the outside, and a storage container part that stores the container;
The detachable arrangement with respect to the container, and a stirring body for stirring the food to be cooked in the container,
The stirring body is
A blade portion for stirring the object to be cooked by rotating the stirring body;
When the stirrer is housed in the container, the agitator is arranged opposite to the inner bottom of the container, and includes a permanent magnet capable of receiving a rotating magnetic field from the outside,
The storage container portion is
A rotating magnetic field generator for generating a rotating magnetic field for the permanent magnet;
A rotating magnetic field controller for controlling the rotating magnetic field generator;
Heating means for heating the container,
The rotating magnetic field generator is
A device-side permanent magnet and a rotation drive unit that face each other so as to face the magnetic field of the permanent magnet,
In the vicinity of the device-side permanent magnet, a detection unit that detects a magnetic coupling state between the permanent magnet and the device-side permanent magnet is provided.

  The heating and stirring cooker of the present invention can be heated while stirring the food to be cooked in a container, and even in a stewed cooking such as curry for several dishes, a person can burn without being stirred regularly with a rice scoop or the like. Uneven heating can be prevented. Furthermore, the stirring body for stirring the object to be cooked is rotated by means of transmission drive means by magnetic coupling, which prevents the magnetic coupling from stepping out due to an increase in rotational torque during stirring and stirring cooking. It is possible to provide a heating and stirring cooker that can stably continue.

The perspective view which shows the heating stirring cooker in Embodiment 1 of this invention. The top view which shows the state which removed the cover body of the heating stirring cooker in Embodiment 1 of this invention. 2 is a cross-sectional view taken along the line AA of FIG. The principal part expanded sectional view of FIG. 3 which shows the heating stirring cooker in Embodiment 1 of this invention. The principal part expanded sectional view for demonstrating operation | movement of the heating stirring cooker in Embodiment 1 of this invention. The top view which shows the principal part of the stirring body in Embodiment 1 of this invention, a side view, and a rear view The exploded perspective view seen from the lower surface side of the stirring body in Embodiment 1 of this invention, and the exploded perspective view seen from the upper surface side Sectional drawing for demonstrating operation | movement of the stirring body in Embodiment 1 of this invention Sectional drawing for demonstrating operation | movement of the stirring body in Embodiment 1 of this invention Sectional drawing for demonstrating operation | movement of the stirring body in Embodiment 1 of this invention Sectional drawing for demonstrating operation | movement of the stirring body in Embodiment 1 of this invention Cross-sectional view of relevant parts for explaining the flow of magnetic force of the magnetic coupling according to the first embodiment of the present invention. Cross-sectional view of relevant parts for explaining the flow of magnetic force of the magnetic coupling according to the first embodiment of the present invention. Cross-sectional view of relevant parts for explaining the flow of magnetic force of the magnetic coupling according to the first embodiment of the present invention. The schematic diagram which shows the rotational deviation angle state of the magnetic coupling in Embodiment 1 of this invention Correlation diagram between rotational deviation angle and rotational torque of magnetic coupling in Embodiment 1 of the present invention Correlation diagram between the range (distance Y) covered by the magnetic force flow in the circumferential direction of rotation of the device-side permanent magnet and the rotation deviation angle in Embodiment 1 of the present invention Schematic view of the main part of a conventional rotary heating cooker Cross-sectional schematic diagram of relevant parts showing another conventional rotary heating cooker Cross-sectional schematic diagram of the relevant part showing a conventional stirring device

According to an aspect of the first invention,
A container that has an inner bottom part and an inner peripheral part capable of storing a food to be cooked, generates heat by receiving heat from the outside, and a storage container part that stores the container;
The detachable arrangement with respect to the container, and a stirring body for stirring the food to be cooked in the container,
The stirring body is
A blade portion for stirring the object to be cooked by rotating the stirring body;
When the stirrer is housed in the container, the agitator is arranged opposite to the inner bottom of the container, and includes a permanent magnet capable of receiving a rotating magnetic field from the outside,
The storage container portion is
A rotating magnetic field generator for generating a rotating magnetic field for the permanent magnet;
A rotating magnetic field controller for controlling the rotating magnetic field generator;
Heating means for heating the container,
The rotating magnetic field generator is
A device-side permanent magnet and a rotation drive unit that face each other so as to face the magnetic field of the permanent magnet,
In the vicinity of the device-side permanent magnet, a detection unit that detects a magnetic coupling state between the permanent magnet and the device-side permanent magnet is provided.

  Thereby, when rotation of the stirrer is stopped due to the biting of the object to be cooked, the rotating magnetic field generating unit continues to rotate, and thus occurs between the permanent magnet of the stirrer and the apparatus-side permanent magnet of the rotating magnetic field generating unit. A step-out phenomenon in which the coupled state is released due to an increase in the repulsive force can be detected in advance by the detection unit, so that stirring is not disabled and stable stirring cooking can be realized.

According to the aspect of the second invention, particularly in the first invention,
The detector is
A change in the flow of magnetic force in the magnetically coupled state between the permanent magnet in the stirring body and the device-side permanent magnet of the rotating magnetic field generation unit is detected.

  Thereby, since a detection part can detect a coupling | bonding state with magnetic force conversion elements, such as a magnetic sensor, it becomes possible to detect without taking a complicated structure.

According to the third aspect of the invention, particularly in the first or second invention,
The detection unit is
When detecting a change in the flow of magnetic force in the magnetic coupling state between the permanent magnet in the stirring body and the device-side permanent magnet of the rotating magnetic field generating unit, the rotating magnetic field control unit changes the rotating direction of the rotating magnetic field generating unit. It is a reverse rotation.

  Thereby, since it will rotate in the direction away from the to-be-cooked item which became the factor of the stop of a stirring body, the stop state of a stirring body can be cancelled | released.

According to the fourth aspect of the invention, in particular, in any one of the first to third inventions,
The rotating magnetic field control unit
After the detection by the detection unit, the rotation magnetic field generation unit is reversely rotated by two rotations or less, and after a predetermined reverse rotation, rotation control is performed to return the rotation direction to normal rotation.

  Thereby, the lump of the to-be-cooked object which became the cause of the stop of a stirring body can be destroyed and scattered by making reverse rotation of a stirring body 1 rotation or more, and rotation of a stirring body is made into normal rotation after that. When returned, the food to be cooked can be continuously stirred.

According to the fifth aspect of the invention, in particular, in any one of the first to fourth inventions,
The detector is
The device-side permanent magnet is disposed opposite to the rotation peripheral direction of the device-side permanent magnet, and detects a change in the flow of magnetic force in the rotation-periphery direction of the device-side permanent magnet.

  As a result, the rotation angle of the device-side permanent magnet is increased in proportion to the increase in the rotation angle between the permanent magnet of the stirrer and the device-side permanent magnet of the rotating magnetic field generation unit up to the displacement angle at which the maximum torque is generated. Since the range in which the magnetic force acts in the outer circumferential direction is expanded, the magnetic force acting in the rotating outer circumferential direction of the device-side permanent magnet can be detected before the step-out between the magnetic couplings occurs. .

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
1 is a perspective view showing a heating and stirring cooker according to Embodiment 1 of the present invention, FIG. 2 is a top view showing a state where a lid of the heating and stirring cooker according to Embodiment 1 of the present invention is removed, and FIG. It is AA sectional drawing of FIG. 2 which shows the heating stirring cooker in Embodiment 1 of this invention. 4 is an enlarged cross-sectional view of the main part of FIG. 3 showing the heating and stirring cooker in the first embodiment of the present invention, and FIG. 5 is a main part for explaining the operation of the heating and stirring cooker in the first embodiment of the present invention. It is an expanded sectional view. FIG. 6 is a top view, a side view, and a rear view showing the main part of the stirrer according to Embodiment 1 of the present invention. FIG. 7 is an exploded perspective view seen from the lower surface side and an exploded perspective view seen from the upper surface side of the stirrer in Embodiment 1 of the present invention. 8 to 11 are cross-sectional views for explaining the operation of the stirrer according to Embodiment 1 of the present invention. FIG. 12 is a cross-sectional view of the main part for explaining the magnetic force flow of the magnetic coupling according to the first embodiment of the present invention. FIG. 13 is a cross-sectional view of the main part for explaining the magnetic force flow of the magnetic coupling according to the first embodiment of the present invention. FIG. 14 and FIG. 14 are cross-sectional views of relevant parts for explaining the flow of magnetic force of the magnetic coupling according to the first embodiment of the present invention. FIG. 15 is a schematic diagram showing the rotational deviation angle state of the magnetic coupling according to the first embodiment of the present invention. FIG. 16 is a correlation diagram between the rotational deviation angle and the rotational torque of the magnetic coupling according to the first embodiment of the present invention. FIG. 17 is a correlation diagram between the range (distance Y) covered by the magnetic force flow in the circumferential direction of rotation of the apparatus-side permanent magnet and the rotation deviation angle according to Embodiment 1 of the present invention.

  In the figure, reference numeral 1 denotes a main body of a heating and stirring cooker, and a storage container portion 3 for storing a container 2 for cooking an object to be cooked (not shown) is provided inside the main body 1. A heater unit 4 that is a heating means that transmits heat in contact with the bottom surface of the container 2 is disposed at the bottom of the storage container unit 3, and a lid body 5 that covers the opening of the container 2 is disposed above the main body 1. 1 is pivotally supported. The container 2 has an inner bottom part and an inner peripheral part so as to be able to store an object to be cooked, and the heater part 4 has a ring shape along the bottom of the container 2 and receives heat from the heater part 4 to receive the container. 2 is exothermic.

  As shown in FIG. 3, reference numeral 6 denotes an agitating body in which a permanent magnet 7 and a clutch portion 8 are accommodated, and a blade portion 10 is formed around the accommodating portion 9. The stirrer 6 is detachably disposed with respect to the inner bottom of the container 2 for storing the food to be cooked, and the stirrer 6 rotates to stir the food to be cooked in the container 2 with the blades 10. ing. When the stirrer 6 is stored in the container 2, the permanent magnet 7 is arranged to face the inner bottom of the container 2 and can receive a rotating magnetic field from the outside. The rotating magnetic field from the outside is generated by a rotating magnetic field generating unit 11 that is housed in the main body 1 and located outside the bottom surface of the container 2 so as to face the permanent magnet 7 of the stirring member 6. That is, the rotating magnetic field generator 11 generates a rotating magnetic field for the permanent magnet 7. The rotating magnetic field generating unit 11 includes a coupling unit 13 that stores the device-side permanent magnet 12 facing the magnetic field of the permanent magnet 7 and a rotation driving unit 14 connected thereto. Since the apparatus-side permanent magnet 12 and the coupling part 13 are configured to be fitted at the fitting part, when the driving force of the rotation driving part 14 is transmitted to the coupling part 13, together with the coupling part 13, the apparatus side The permanent magnet 12 rotates to form a rotating magnetic field.

  Reference numeral 50 denotes a rotating magnetic field control unit that is a means for controlling the rotating magnetic field. The rotating magnetic field control unit 50 controls the rotation of the rotation driving unit 14 constituting the rotating magnetic field generating unit 11 to rotate the magnetic field of the device-side permanent magnet 12. The rotating magnetic field can be controlled by changing. The coupling portion 13 has a clearance of about 1 mm from the outer bottom surface of the container 2 through the central opening of the heater portion 4, and the spacer member 15 sandwiched between the coupling portion 13 and the outer bottom surface of the container 2 is cupped. It is assembled to the upper part of the ring part 13.

  As shown in FIG. 4, a detection unit 33 that detects a magnetic coupling state between the permanent magnet 7 and the device-side permanent magnet 12 is provided in the vicinity of the device-side permanent magnet 12. The detection unit 33 detects a change in the flow of magnetic force in the magnetic coupling state between the permanent magnet 7 in the stirring body 6 and the apparatus-side permanent magnet 12 of the rotating magnetic field generation unit 11. More specifically, the detection unit 33 is disposed so as to face the rotation peripheral direction of the device-side permanent magnet 12 and detects a change in the flow of magnetic force in the rotation peripheral direction of the device-side permanent magnet 12.

  In this embodiment, a magnetic sensor such as a Hall element or a magnetoresistive element is used for the detection unit 33. However, a machine that combines a magnetic body and a switching element, such as a micro switch having an on / off lever formed of a magnetic body. It may be an expression detection configuration.

  A part of the inner periphery of the container 2 has a curved section by projecting about 6 mm toward the center of the container 2 for the purpose of advantageously exerting stirring characteristics when the food is stirred. A baffle portion 16 (see FIG. 2) is provided.

  4 and 5, 7 is a permanent magnet, and 8 is a clutch portion. Both of them are stored in the storage unit 9. In FIG. 6, the permanent magnet 7 is a magnet that arranges four magnetic poles in a ring shape in the order of N / S / N / S and suppresses the leakage of magnetic force on the upper side in the storage state in the storage unit 9. The metal plate 17 is bonded. Here, the upper side means the side opposite to the side where the external rotating magnetic field is applied to the permanent magnet 7 in the storage unit 9. An opening 18 having a linear portion of at least one side is formed in a portion of the magnetic metal plate 17 located at the center of the rotation axis.

  In FIG. 7, the clutch pawl portion 19 constituting the clutch portion 8 is fitted into the opening 18 of the magnetic metal plate 17 so that the clutch pawl portion 19 and the permanent magnet 7 are integrated. The clutch claw portion 19 has a substantially cylindrical shape and is provided with a substantially trapezoidal claw portion 20 on the inner peripheral side. The claw portion 20 has a bottom bottom on the side where the permanent magnet 7 receives an external magnetic field. The width is smaller than the top bottom. That is, an inclined surface whose circumferential width increases from the lower base toward the upper base is formed. Furthermore, the nail | claw part 20 becomes the convex shape which protrudes from an inner peripheral part side. The permanent magnet 7 and the clutch claw portion 19 are assembled by penetrating a columnar portion 21 provided at the center of the rotation axis in the storage portion 9, and are slidably contacted with the columnar portion 21 to be vertically moved and held in the rotation direction. It is configured as follows. In other words, the permanent magnet 7 is accommodated in the accommodating part 9 so as to be movable in the height direction of the columnar part 21. The clutch engaging portion 22 opposed to the clutch pawl portion 19 constituting the clutch portion 8 is formed in a substantially cylindrical shape, passes through the columnar portion 21 and is arranged near the bottom position of the storage portion 9. The joining portion 22 and the columnar portion 21 are engaged so as not to be displaced in the axial rotation direction. The clutch engaging part 22 is provided with an engaging part 23 that fits with the claw part 20 of the clutch claw part 19 in the housing part 9 on the outer peripheral surface of the substantially cylindrical shape, and on the inclined surface of the claw part 20 of the clutch claw part 19. A matching inclined surface is formed. Therefore, the engaging portion 23 is formed in a concave shape and is slightly smaller than the size of the claw portion 20. As shown in FIG. 4, the tip of the columnar portion 21 is fixed to the upper fixed position portion 32 by fastening means in a state where the permanent magnet 7 and the like are stored in the storage portion 9.

A concave portion is provided in a portion corresponding to the inner side of the columnar portion 21 at the center of the bottom surface rotation shaft of the storage portion 9, and a bushing 24 for bearings and a shaft portion 26 provided with a substantially disc-shaped receiving portion 25 are assembled. (See FIG. 4). When the stirring body 6 is set in the container 2, the receiving portion 25 of the shaft portion 26 is put on the inner bottom portion of the container 2, and the blade portion 10 and the storage portion 9 of the stirring body 6 are centered on the shaft portion 26. Will rotate. That is, the shaft portion 26 is in a state where it is grounded and fixed to the inner bottom portion of the container 2, and almost no rotation operation occurs.

  As shown in FIGS. 7 to 11, a compression coil spring 27 is arranged on the clutch pawl portion 19 so as to apply an upward pressure to the clutch pawl portion 19 between the clutch pawl portion 19 and the bottom surface of the storage portion 9. . In other words, the compression coil spring 27 urges the permanent magnet 7 in the storage unit 9 to the side opposite to the side to which the rotating magnetic field from the rotating magnetic field generating unit 11 is applied. The load of the compression coil spring 27 is set by pushing up the clutch pawl portion 19, that is, the permanent magnet 7 and the magnetic metal plate 17 in the direction of the upper fixed position portion 32 of the storage portion 9 and directly below the upper fixed position portion 32. When the storage unit 9 is placed on a magnetic metal plate (for example, on an iron plate), the attractive force attracted to the metal plate side by the magnetic force of the permanent magnet 7 when the storage unit 9 is in a state to be performed (see FIGS. 5 and 10). On the other hand, the load is set so as to apply a pressure of 1.2 to 1.5 times to the permanent magnet 7. The clutch engaging part 22 formed in a substantially cylindrical shape has an outer periphery other than the engaging part 23 with which the claw part 20 of the clutch claw part 19 engages, and the permanent magnet 7 and the magnetic metal plate 17 are directly below the upper fixed position part 32. As shown in FIG. 10, when the permanent magnet 7 and the magnetic metal plate 17 are located directly below the upper fixed position portion 32 of the storage portion 9 as shown in FIG. The claw portion 20 of the portion 19 slides and rotates while sliding on the surface of the slide portion 28. The slide portion 28 is formed continuously with the engaging portion 23.

  As shown in FIG. 5, on the inner surface of the side wall in the storage portion 9, the thickness 1 is set at a height position facing the peripheral side surface of the permanent magnet 7 when the permanent magnet 7 moves to a position directly below the upper fixed position portion 32. A ring-shaped magnetic metal body 29 of ˜3 mm is fixedly attached in the storage portion 9. A clearance of 0.5 to 3 mm is provided between the ring-shaped magnetic metal body 29 and the permanent magnet 7 so that the permanent magnet 7 does not come into contact with the storage unit 9 when it is moved up and down and rotated. Yes. As shown in FIG. 4, when the permanent magnet 7 is positioned at the lower end of the storage portion 9, there is no ring-shaped magnetic metal body 29 on the inner surface of the storage portion 9 at a position facing the outer periphery of the permanent magnet 7. As shown, the ring-shaped magnetic metal body 29 is configured to face the outer peripheral position of the permanent magnet 7 when the permanent magnet 7 is positioned at the upper end in the storage portion 9.

  As shown in FIG. 9, the inclined surface in contact with the claw portion 20 of the clutch claw portion 19 in the engagement portion 23 of the clutch engagement portion 22 is mainly inclined in the direction of rotation (right (positive) rotation direction). In the plane (A) 30, the inclination angle θ1 is set to 65 ° to 85 ° with respect to the rotation plane, and in the inclined plane (B) 31 on the symmetrical side (left (reverse) rotation direction), As shown in FIG. 11, the inclination angle θ2 is set to 45 ° to 75 ° with respect to the rotation plane.

  As the material of the permanent magnet 7 used for the stirrer 6 and the magnet of the device side permanent magnet 12 used for the rotating magnetic field generator 11, a neodymium sintered magnet is selected as the device side permanent magnet 12, The permanent magnet 7 is selected from neodymium sintered magnets, samarium cobalt magnets, Fe—Cr—Co based magnets, or Fe—Nd—B based bonded magnets. At this time, the permanent magnet 7 is made of a magnet material and a magnet size so that magnetic properties such as adsorption force are lower than those of the apparatus-side permanent magnet 12 in consideration of handling when the stirring body 6 is removed from the container 2. It is set.

Next, the function of the stirring body 6 will be described.
The stirrer 6 is configured to transmit the rotation operation to the rotating magnetic field generator 11 in a non-contact manner through the thickness of the bottom of the container 2 by the rotating magnetic field generator 11 disposed outside the bottom of the container 2 in the main body 1. It is. As shown in FIG. 6, this rotating operation is performed by alternately arranging the N poles and S poles of the permanent magnet 7 accommodated in the stirring body 6 in the circumferential direction to form a ring shape, and the rotating magnetic field so as to face it. The device-side permanent magnet 12 configured in the coupling portion 13 that generates the N poles and the S poles are alternately arranged in the circumferential direction. With this configuration, the permanent magnet 7 of the stirrer 6 and the apparatus-side permanent magnet 12 of the rotating magnetic field generator 11 are synchronized by the attractive force due to the opposite polarities and the repulsive force generated between the adjacent magnetic poles. And rotate.

  In FIG. 2, the clockwise rotation indicated by the solid line arrow in the stirring body 6 is the forward rotation direction, and the counterclockwise rotation indicated by the broken line arrow is the reverse rotation direction. As shown in FIG. 2, the shape of the blade portion 10 of the stirring member 6 is rotated forward so that the objects to be cooked are gathered from the center side of the container 2 toward the outer peripheral portion of the container 2 toward the downstream side in the forward rotation direction. It curves in a convex shape. Moreover, the effect | action which moves a to-be-cooked object toward the center of the container 2 will function if the stirring body 6 is reversely rotated by the shape of the blade | wing part 10 of the stirring body 6. FIG. The rotating magnetic field control unit 50 controls the rotating magnetic field generating unit 11 to rotate the rotating magnetic field N in the normal rotating direction N times in the normal rotating direction in the normal stirring operation, and after N rotations, Control is performed so that the rotating magnetic field is rotated in the reverse rotation direction by M rotations less than N rotations. The ratio of the rotation speed M rotation in the reverse rotation direction to the rotation speed N rotation in the forward rotation direction is executed in the range of 0.9 to 0.1 and is controlled so that the forward rotation ratio is increased. Thus, the cooking objects gathered by the rotation in the forward rotation direction are changed so that the rotation direction is changed to the reverse rotation in the middle and the cooking objects are moved toward the center of the container 2, so that the stirring action is improved. An increase in load can be suppressed and the object to be cooked can be efficiently stirred. Further, the ratio between the rotational speed N in the forward rotation direction and the rotational speed M in the reverse rotation direction is set so that the position of the blade portion 10 at the time of switching the rotation direction of the stirring body 6 does not become the same position.

  The stirring action of the food to be cooked by the stirring body 6 is as follows. The blade 10 pushes the food to be cooked toward the inner peripheral portion of the container 2 by the rotation of the stirring body 6 in the forward rotation direction. Due to the resistance received from the peripheral part or the resistance that the cooked food receives from the baffle part 16 provided on the inner peripheral part of the container 2, the action of the cooked material overcoming the blade part 10 and thereby returning the cooked food occurs. Yes. In this way, by rotating the stirring body 6 by alternately combining forward rotation and reverse rotation, the front and back of the food to be cooked are returned while the food to be cooked is scattered or gathered in the container 2. Heating and stirring cooking can be performed so that the heat of the heater unit 4 is transmitted from the bottom surface to the entire object to be cooked. In this embodiment, the rotation speed of the stirring member 6 is set to a low-speed rotation of 2 to 20 rotations per minute on the premise of the cooking object mainly made of solid matter.

  Next, the clutch mechanism of the stirrer 6 will be described.

  When this stirring cooking is performed, the clutch unit 8 is in a state in which the rotational force generated by the rotating magnetic field from the rotating magnetic field generating unit 11 is transmitted to the storage unit 9 via the permanent magnet 7. Specifically, as shown in FIGS. 4 and 8, the claw portion 20 of the clutch claw portion 19 and the engagement portion 23 of the clutch engagement portion 22 are engaged in the storage portion 9 of the stirring body 6, and the permanent magnet 7 is in a state of being lowered to the bottom surface position of the storage portion 9. As shown in FIG. 4, the permanent magnet 7 is in a state of being lowered to the bottom surface of the storage portion 9, and the magnetic gap A between the permanent magnet 7 and the apparatus-side permanent magnet 12 of the rotating magnetic field generating portion 11 is configured. The shortest distance above, and the maximum magnetic motion that can be generated between the magnets can be generated. At this time, the compression coil spring 27 is also contracted, and the load for pushing up the permanent magnet 7 increases. However, the magnetic attractive force between the permanent magnet 7 and the apparatus-side permanent magnet 12 is much stronger. Therefore, there is little decrease from the rotational torque that can be generated only with the original magnet. The attracting force generated between the magnets in the present embodiment is approximately 4.0 kgf.

The operation of rotating the blade portion 10 of the stirrer 6 is transmitted by the permanent magnet 7 in synchronization with the rotational force generated by the rotating magnetic field from the device-side permanent magnet 12, and the permanent magnet 7 rotates. As shown in FIG. 8, since the claw portion 20 of the clutch claw portion 19 and the engagement portion 23 of the clutch engagement portion 22 are engaged in the storage portion 9 of the stirring body 6, the rotational force of the permanent magnet 7 Is transmitted to the engaging portion 23 of the clutch engaging portion 22 through the claw portion 20 of the clutch claw portion 19. By applying a rotational force to the engaging portion 23,
The storage portion 9 integrated with the engaging portion 23 rotates around the shaft portion 26, the blade portion 10 formed on the outer side surface of the storage portion 9 rotates, and the agitator 6 rotates.

  When the agitator 6 is removed from the container 2 after cooking is complete, the user rotates the blade 10 clockwise as shown in FIG. The permanent magnet 7 in the stirrer 6 also stays at that position due to the attractive force generated by the rotating magnetic field from the device-side permanent magnet 12 in the coupling unit 13. For this reason, as shown in FIG. 9, the claw portion 20 of the clutch claw portion 19 acts to push the engagement portion 23 of the clutch engagement portion 22 in the rotation direction, and the claw portion 20 is engaged. Ascending along the inclined surface 30 of the joint portion 23, the lower bottom of the claw portion 20 is on the slide portion 28 as shown in FIG. At this time, since the permanent magnet 7 is rotated in the rotational direction by the pressing force from the clutch pawl portion 19 in the rotational direction, there is a range of the same polarity with the device-side permanent magnet 12. As a result, the repulsive force generated there also acts to raise the permanent magnet 7.

  When the permanent magnet 7 moves to the state shown in FIG. 10, the clutch unit 8 is in a state where the rotational force generated by the rotating magnetic field from the rotating magnetic field generating unit 11 is not transmitted to the storage unit 9 via the permanent magnet 7. This is because the claw portion 20 of the clutch claw portion 19 and the engagement portion 23 of the clutch engagement portion 22 are not engaged, so that even if the permanent magnet 7 is rotated, the rotational force of the permanent magnet 7 is the clutch claw portion 19. This is because it is not transmitted to the engaging portion 23 of the clutch engaging portion 22 via the claw portion 20.

  When the permanent magnet 7 moves to the state shown in FIG. 10, as shown in FIG. 5, the magnetic gap B between the permanent magnet 7 and the apparatus-side permanent magnet 12 of the rotating magnetic field generation unit 11 is as shown in FIG. From the magnetic gap A between the magnets shown in FIG. 3, the height of the engaging portion 23 of the clutch engaging portion 22 is increased. In this embodiment, the engagement height is set to about 10 mm, and the attractive force between the permanent magnet 7 and the apparatus-side permanent magnet 12 drops to about 1.0 Kgf. The attractive force between the magnets can be reduced by about 75%, and the load when the stirring body 6 is removed is greatly reduced. Therefore, the stirring body 6 can be easily removed from the container 2.

  As shown in FIG. 10, the removed stirring body 6 is in a state where the permanent magnet 7 and the magnetic metal plate 17 are held directly below the upper fixed position portion 32 in the storage portion 9. Even when placed on a sink or the like of a kitchen made of magnetic metal, the thickness of the bottom of the stirring body 6 and the clutch portion 8 are between the placed metal surface and the suction surface of the permanent magnet 7. A spatial distance L1 that matches the engagement height is formed. Since the strength of the magnetic force reaching the bottom surface of the stirrer 6 can be almost eliminated by the spatial distance L1, the adsorption is such that it can be said that it is hardly adsorbed. Similarly, in metal utensils and kitchen utensils made of magnetic metal such as forks and knives, the forks and knives are inadvertently attracted by the magnetic force because they are hardly attracted by the magnetic force of the stirrer 6. No worries about adsorbing. At this time, since the claw portion 20 of the clutch claw portion 19 is on the slide portion 28 of the clutch engagement portion 22, it does not fall downward even when a strong impact is applied, and the storage portion 9 It does not happen that the attractive force from the permanent magnet 7 on the bottom surface returns to a strong state.

  In the stirrer 6 of the present embodiment, if the permanent magnet 7 is fixed to the bottom of the storage unit 9 in terms of the magnetic characteristics of the permanent magnet 7 stored in the storage unit 9, When attached to a metal plate or the like, the suction force is about 3.5 kgf, but due to the action of the clutch portion 8, the suction force is reduced to about 100 to 300 gf.

In the stirrer 6 of the present embodiment, the surface opposite to the surface where the permanent magnet 7 attracts the rotating magnetic field generator 11, that is, the surface corresponding to the upper side of the stirrer 6, in other words, the upper fixed position portion. As shown in FIG. 6, a magnetic metal plate 17 is attached to the permanent magnet 7 on the surface facing the surface 32. Due to this configuration, even when the permanent magnet 7 is positioned on the upper surface of the stirrer 6, the flow of magnetic force is concentrated in the magnetic metal plate 17, and almost no magnetic field is transmitted to the outside of the stirrer 6. Therefore, the metal object is not adsorbed on the upper surface of the stirring body 6.

  Further, in the agitator 6 of the present embodiment, as shown in FIG. 10, a ring-like shape is formed on the outer periphery of the storage portion 9 so that the permanent magnet 7 is opposed when it is located immediately below the upper fixed position portion 32. A magnetic metal body 29 is arranged. In other words, the clutch unit 8 is in a state in which the rotational force generated by the rotating magnetic field from the rotating magnetic field generating unit 11 is not transmitted to the storage unit 9 via the permanent magnet 7, and the storage unit 9 that faces the peripheral side surface of the permanent magnet 7. A ring-shaped magnetic metal body 29 is disposed on the surface. With this configuration, the flow of magnetic force from the permanent magnet 7 is concentrated within the thickness of the ring-shaped magnetic metal body 29 even on the peripheral side surface of the stirring body 6, so that almost no magnetic field is transmitted to the outside of the side surface of the stirring body 6. Therefore, the metal object is not adsorbed on the side surface of the stirring body 6.

  Here, in the present embodiment, the ring-shaped magnetic metal body 29 is provided only at the opposing position when the permanent magnet 7 is lifted, but the storage portion 9 is in balance with the set stirring torque. The ring-shaped magnetic metal body 29 may be provided in the entire side surface height direction, or the ring-shaped magnetic metal body 29 may be assembled to the outer periphery of the side surface of the permanent magnet 7. Further, the housing portion 9 itself of the stirring member 6 may be made of a non-metal or non-magnetic metal, and the side portion and the upper fixing position portion 32 may be made of a magnetic metal by means of joining different materials. good.

  Further, in the present embodiment, by providing the compression coil spring 27 between the clutch claw portion 19 and the bottom surface of the storage portion 9, even after the cooking is completed, the clutch portion 8 is not operated after the cooking is finished. The permanent magnet 7 and the magnetic metal plate 17 are pushed up to a position directly below the upper fixed position portion 32 by the compression coil spring 27. The compression coil spring 27 is a pressure slightly larger than the attraction force generated when the magnetic metal plate is grounded to the bottom surface of the storage portion 9 in a state where the permanent magnet 7 and the magnetic metal plate 17 are located directly below the upper fixed position portion 32. Is set so as to be applied to the permanent magnet 7, the permanent magnet 7 does not fall down to the extent that a slight impact is applied, such as dropping the stirring member 6.

  When the agitator 6 is set on the inner bottom of the container 2 again, as shown in FIG. 2, the blade portion 10 is moved to the right with the bottom of the storage portion 9 of the agitator 6 grounded to the inner bottom of the container 2. As shown in FIG. 11, when the permanent magnet 7 slides in the rotation direction together with the claw portion 20 riding on the slide portion 28 when the claw portion 20 is applied to the inclined surface 31 of the clutch engaging portion 22. As shown in FIG. 8, the permanent magnet 7 is positioned at the bottom position of the storage portion 9 by sliding downward along the inclined surface 31. In the state of the magnetic gap B shown in FIG. 5 immediately after the stirrer 6 is set in the container 2, the attractive force due to the magnetic field with the rotating magnetic field generator 11 is greater than the pressing force of the compression coil spring 27, and the permanent magnet 7 Even when the compression coil spring 27 increases in pressure as it descends toward the bottom position of the storage portion 9, the attractive force between the magnets further increases as the magnetic gap shrinks. Due to this configuration, the permanent magnet 7 can surely descend to the bottom surface position of the storage portion 9 and generate a desired stirring torque.

  Next, operations of the clutch unit 8 and the detection unit 33 during stirring cooking will be described.

During agitation during cooking, the type of food to be cooked (for example, meat, potatoes, onions, beans, etc.), the size of the food to be cooked, the state of the food to be cooked (for example, chopped, chopped, etc.) As the amount of the food to be cooked is mixed by stirring, when the conditions overlap, the food to be cooked is sandwiched between the blade portion 10 of the stirring body 6 and the inner peripheral portion of the container 2, and the stirring body 6 A rotational load may be applied. In particular, in this embodiment, the food to be cooked is likely to be caught between the baffle portion 16 on the inner peripheral portion of the container 2 and the tip of the blade portion 10 of the stirrer 6 provided in order to favorably exert the stirring characteristics. It is in. In the case of the conventional configuration, when such a load is applied, the stirrer 6
The rotation magnetic field generator 11 continues to rotate, while the rotation of the permanent magnet 7 continues to rotate, increasing the rotational deviation angle between the permanent magnet 7 and the apparatus-side permanent magnet 12, and between the opposing magnets. Since the reversal force is changed from the state of being in a suction relationship because of the opposite polarity to the same polarity, the repulsive force is changed to the direction of the repulsive force. It will be in the state which deviated from the center, ie, the state which step-outs. Once in this state, it becomes difficult for the stirrer 6 to return to the center of the rotating magnetic field due to the food to be cooked, and the original stirring function is stopped. In such a conventional configuration, when the stirring operation is stopped and the heating is continued and the cooking is continued, the cooking object is heated unevenly, which causes problems such as uneven heating and partial burning. It was.

  On the other hand, when the above-described load is applied by the clutch unit 8 of the present embodiment, the blade unit 10 and the storage unit 9 of the stirring body 6 remain in place (stopped) due to the load. However, the permanent magnet 7 rotates while being attracted to the magnetic field of the rotating magnetic field generator 11, and the claw portion 20 of the clutch claw portion 19 slides up the inclined surface 30 of the engaging portion 23 as shown in FIG. 9. As shown in FIG. 10, the lower bottom of the claw portion 20 rides on the slide portion 28 of the clutch engaging portion 22 and maintains the magnetic field attracting state, so that it does not deviate from the center of the rotating magnetic field. There is no step-out.

  When the magnetic gap between the permanent magnet 7 and the apparatus-side permanent magnet 12 is expanded by the operation of the clutch unit 8, the magnetic coupling force between the magnets, in other words, the attracting force is weakened, and at the same time, the magnetic force flow between the magnets changes. . This change in the flow of magnetic force is such that when the magnetic gap between the permanent magnet 7 and the apparatus-side permanent magnet 12 is expanded, the range of the magnetic force in the rotation peripheral direction of the permanent magnet 7 and the apparatus-side permanent magnet 12 is expanded. That is, when the range of the magnetic force in the rotation peripheral direction of the apparatus-side permanent magnet 12 is expanded, the detection unit 33 arranged in the expanded range detects the magnetic force and determines that the clutch unit 8 of the stirring body 6 has been operated. can do.

  Regarding the change in the flow of the magnetic force, the difference between the cooking agitation and the clutch operation will be described in detail with reference to FIGS.

  FIG. 12 is a schematic diagram showing a state where the spatial distance between the permanent magnet 7 and the apparatus-side permanent magnet 12 in which the stirring body 6 is set in the container 2 and the stirring operation is possible becomes the magnetic gap A. On the other hand, FIG. 13 is a schematic diagram showing a state in which the spatial distance between the permanent magnet 7 and the apparatus-side permanent magnet 12 becomes the magnetic gap B by the operation of the clutch unit 8.

  In FIG. 12, when the stirring operation is possible, that is, when the attraction force acts between the permanent magnet 7 and the apparatus-side permanent magnet 12 and is in the magnetically coupled state, the magnetic force flow between the magnets is as shown in FIG. As shown by the arrows in the figure, the range (distance Y1) where the magnetic force flows in the rotation peripheral direction of the apparatus-side permanent magnet 12 is concentrated between the rotation surfaces, that is, the magnetic coupling surfaces, in the vicinity of the rotation periphery. Only works. Since the distance X between the detection unit 33 and the outer periphery of the device-side permanent magnet 12 is set as X> Y1, the change in the magnetic force flow in the magnetic coupling state between the permanent magnet 7 and the device-side permanent magnet 12 is changed. The detection part 33 to detect will be in the state which does not detect magnetic force. When the clutch unit 8 is operated, as shown in FIG. 13, the magnetic force flow between the permanent magnet 7 and the apparatus-side permanent magnet 12 is increased in a state where the spatial distance between the magnets is increased and the magnetic coupling state is weakened. As a result, the permanent magnet 7 and the apparatus-side permanent magnet 12 each increase the flow of magnetic force between adjacent magnets. At this time, as shown in FIG. 13, the range (distance Y <b> 2) in which the magnetic force flows in the rotation peripheral direction of the device-side permanent magnet 12 increases, and the outer circumference of the device-side permanent magnet 12 where the detection unit 33 is located is increased. From the distance X, X <Y2, and the detection unit 33 that detects a change in the flow of magnetic force in the magnetic coupling state between the permanent magnet 7 and the apparatus-side permanent magnet 12 detects the magnetic force. The detection unit 33 discriminates the operation of the clutch unit 8 by detecting a change in the range covered by the magnetic force flowing in the rotation peripheral direction of the device-side permanent magnet 12.

  When the detection unit 33 detects a change in the magnetic force flow in the magnetic coupling state between the permanent magnet 7 in the stirring body 6 and the apparatus-side permanent magnet 12 of the rotating magnetic field generating unit 11, the rotating magnetic field control unit 50 detects the rotating magnetic field. A signal for switching the rotation direction of the generating unit 11 to reverse rotation is output, and the stirring body 6 is rotated once or twice through the device-side permanent magnet 12 and the permanent magnet 7, and then the normal stirring operation is performed. Control is performed to return to the setting of N rotation in the forward rotation direction and M rotation in the reverse rotation direction.

  Here, after the detection by the detection unit 33, the number of reverse rotations of the stirrer 6 is set to 1 to 2 by causing the state of the object to be cooked that has caused the stirrer 6 to stop once or more. This is because an effect can be obtained in which the problem that the stirrer 6 stops again immediately after returning to the normal stirring operation can be prevented.

  Here, as shown in FIG. 10, the bottom of the claw portion 20 of the clutch claw portion 19 moves so as to ride on the slide portion 28 of the clutch engagement portion 22, and the claw portion 20 slides on the slide portion 28. When rotating, the clutch unit 8 is in a state in which the rotational force generated by the rotating magnetic field from the rotating magnetic field generating unit 11 is not transmitted to the storage unit 9 via the permanent magnet 7. The part 9 is in a state where it stays in place (stopped state) due to the load. This is because the claw portion 20 of the clutch claw portion 19 and the engagement portion 23 of the clutch engagement portion 22 are not engaged, so that even if the permanent magnet 7 is rotated, the rotational force of the permanent magnet 7 is the clutch claw portion 19. This is because it is not transmitted to the engaging portion 23 of the clutch engaging portion 22 via the claw portion 20.

  In the present embodiment, the stirrer 6 having the clutch portion 8 has been described. However, even when the clutch portion 8 is not configured, a similar change in the magnetic force flow occurs.

  FIG. 14 is a schematic diagram showing a state in which the permanent magnet 7 and the apparatus-side permanent magnet 12 have the same polarity (N and N, S and S face each other) in the same magnetic gap A as in FIG. In this state, a repulsive force acts on the magnetic coupling state between the permanent magnet 7 and the apparatus-side permanent magnet 12, and the magnetic force between the permanent magnet 7 and the apparatus-side permanent magnet 12 is as shown in FIG. There is no flow, and the permanent magnet 7 and the apparatus-side permanent magnet 12 act only on the flow of magnetic force between the adjacent magnets. In this magnetic coupling state, the range (distance Y3) in which the magnetic force flows in the circumferential direction of rotation of the device-side permanent magnet 12 is larger than the distance X from the outer periphery of the device-side permanent magnet 12 where the detection unit 33 is located. Since <Y3, the detection unit 33 that detects a change in the flow of magnetic force in the magnetically coupled state between the permanent magnet 7 and the apparatus-side permanent magnet 12 detects the magnetic force. Therefore, even when the clutch unit 8 is not configured, the detection unit 33 detects the change in the range in which the magnetic force flows in the circumferential direction of rotation of the device-side permanent magnet 12, so that the rotating operation of the agitator 6 can be performed. That is, it can be determined that the food has stopped due to the bite of the cooking object.

  In general, in the magnetic coupling, the rotational torque increases as the rotational deviation angle increases, and the step-out occurs when the maximum torque is reached. FIG. 15 shows a state of rotational deviation in the four-pole magnetic coupling configuration used in the present embodiment, and in order to explain the positional relationship, the device-side permanent magnet 12 is outside the permanent magnet 7. The diameter is greatly illustrated.

In the four-pole magnetic coupling used in the present embodiment, the rotational torque is 0 when the rotational deviation angle is 0 °, the rotational torque increases as the rotational deviation angle increases, and the rotational deviation angle becomes 45 °. Is the maximum rotational torque. The rotational torque is generated by the action of the attractive force and the repulsive force acting between the permanent magnet 7 and the apparatus-side permanent magnet 12, and when viewed from a part of the magnetic pole N1b on the permanent magnet 7 side that receives the rotational action. In the state where the rotational deviation angle in FIG. 15 is 0 °, the magnetic pole N1b is in a state where only the attractive force from the magnetic pole S1a of the device-side permanent magnet 12 acts and is not receiving a repulsive force. As the rotational deviation angle increases, the rotational torque of the magnetic pole N1b increases as the repulsive force (thick arrow) from the magnetic pole N1a increases simultaneously with the attractive force (dashed arrow) from the magnetic pole S1a. . When the rotation deviation angle reaches 45 °, the repulsive force from the magnetic pole N1a and the attractive force from the magnetic pole S1a are almost equal to each other in the magnetic pole N1b. Indicates the value. Furthermore, when the rotation deviation angle increases, the magnetic torque N1b gradually begins to decrease because the rate at which the repulsive force received from the magnetic pole N1a is greater than the attractive force received from the magnetic pole S1a increases. When the rotation deviation angle reaches 90 °, the magnetic pole N1b receives only the repulsive force from the magnetic pole N1a, and the rotational torque becomes zero. When the rotation deviation angle is further increased, the magnetic pole N1b starts to receive the attractive force from the magnetic pole S2a simultaneously with the repulsive force from the magnetic pole N1a, and the rotational torque in the direction opposite to the previous direction increases. As described above, the rotational torque changes with the correlation as shown in FIG. 16 along with the change of the rotational deviation angle.

  On the other hand, as shown in the schematic diagram of FIG. 14, the change in the range (distance Y) in which the magnetic force flows in the rotation peripheral direction of the permanent magnet 7 and the apparatus-side permanent magnet 12 is the magnetism between the magnetic couplings. When the coupled state is repelled, the magnetic force flow between the magnetic couplings changes to the magnetic force flow between adjacent magnets in each magnetic coupling, so the rotational deviation angle increases from 0 ° to 90 °. Then, in the magnetic coupling state between the magnetic couplings, the repulsive force that the magnetic pole N1b receives from the magnetic pole N1a is increased, and the rotation around the rotation of the device-side permanent magnet 12 is the same as the change that becomes maximum when the rotational deviation angle is 90 °. The range (distance Y) covered by the magnetic force flow in the direction is also maximized when the rotational deviation angle is 90 °, as shown in FIG.

  Therefore, if the detection unit 33 is disposed within this range (distance X), it is possible to detect immediately before the magnetic coupling step-out occurs.

  It is to be noted that, by appropriately combining any of the various embodiments, the effects possessed by them can be produced. For example, the heating means is not limited to the heater, and may be one using a heating means such as induction heating, steam, hot air, or radiation heating.

  As described above, in the present embodiment, since the food to be cooked in the heating container can be heated and stirred by the stirring body, for example, even in stewed cooking with a large load such as curry for several dishes, the rice paddle is regularly cooked. Thus, it is possible to prevent scorching and uneven heating without stirring. Rotating force of the stirrer from the direction opposite to the rotation in the normal rotation direction with respect to the object to be cooked by rotating the stirrer in a different ratio between the normal rotation direction and the reverse rotation direction. Can be agitated while canceling the increase factor of the load applied to the agitator due to excessive bias of the object to be cooked. Furthermore, when the agitator is overloaded and the rotation of the agitator stops, it is detected and the direction of rotation is switched to the reverse direction to release the overload condition and control to return to the normal agitation operation. Therefore, there is no need to monitor the cooking process by opening the lid until cooking is completed, and it is possible to provide a cooking device that can be expected to suppress heat loss due to opening the lid. Can do.

  As described above, the heating and stirring cooker according to the present invention is extremely useful because it is not necessary to take time and effort until cooking is completed simply by adding the food to be cooked in advance at the start of cooking. In particular, the present invention can be effectively applied to a configuration in which an operation unit and a display unit are provided on a lid such as an electric pressure cooker or a multi-cooker and a closing mechanism is provided, or a cooking device having a timer reservation.

2 Container 3 Storage container 4 Heater (heating means)
6 Stirring body 7 Permanent magnet 8 Clutch part 9 Storage part 10 Blade part 11 Rotating magnetic field generating part 12 Device side permanent magnet 14 Rotation driving part 33 Detection part 50 Rotating magnetic field control part

Claims (5)

A container that has an inner bottom part and an inner peripheral part capable of storing a food to be cooked, generates heat by receiving heat from the outside, and a storage container part that stores the container;
The detachable arrangement with respect to the container, and a stirring body for stirring the food to be cooked in the container,
The stirring body is
A blade portion for stirring the object to be cooked by rotating the stirring body;
When the stirrer is housed in the container, the agitator is arranged opposite to the inner bottom of the container, and includes a permanent magnet capable of receiving a rotating magnetic field from the outside,
The storage container portion is
A rotating magnetic field generator for generating a rotating magnetic field for the permanent magnet;
A rotating magnetic field controller for controlling the rotating magnetic field generator;
Heating means for heating the container,
The rotating magnetic field generator is
A device-side permanent magnet and a rotation drive unit that face each other so as to face the magnetic field of the permanent magnet,
A heating and stirring cooker provided with a detection unit for detecting a magnetic coupling state between the permanent magnet and the device-side permanent magnet in the vicinity of the device-side permanent magnet. The detector is
The heating and stirring cooker according to claim 1, wherein a change in the flow of magnetic force in a magnetically coupled state between the permanent magnet in the stirring body and the device-side permanent magnet of the rotating magnetic field generation unit is detected. The detection unit is
When detecting a change in the flow of magnetic force in the magnetic coupling state between the permanent magnet in the stirring body and the device-side permanent magnet of the rotating magnetic field generating unit, the rotating magnetic field control unit changes the rotating direction of the rotating magnetic field generating unit. The heating and stirring cooker according to claim 1 or 2, wherein the cooker is reversely rotated. The rotating magnetic field control unit
The rotation control for returning the rotation direction to the normal rotation is performed after the predetermined reverse rotation after the rotation of the rotating magnetic field generation unit is rotated twice or less after the detection by the detection unit. The heating and stirring cooker according to item 1. The detector is
5. The apparatus according to claim 1, wherein the device-side permanent magnet is disposed so as to oppose the rotation peripheral direction of the device-side permanent magnet, and detects a change in magnetic force flow in the rotation-periphery direction of the device-side permanent magnet. Heating stir cooker.

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