JP4327777B2 - Heating cooker and crack detection method for its pot-like container - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a heating cooker that heats and cooks food contained in a pot-like container with heating means, and particularly, a heating cooker equipped with a pot-like container made of a material that may be damaged and leaked water, and The present invention relates to a method for detecting cracks in a pan-like container of a heating cooker.

  Conventionally, in a pot-like container used in a heating cooker such as a cooker, for example, the pot-like container is made of a ceramic material or ceramic for the purpose of saving energy at the time of heat insulation, while making it difficult for food to adhere to it. Producing with a material such as a glass mixture has been proposed (see, for example, Patent Document 1).

JP 2005000413 A

  However, a pot-shaped container made of the ceramic material as described above or a mixed material of ceramic and glass may be cracked or cracked against a strong impact as compared with a conventional metallic pot-shaped container. And if you use this cracked pot-shaped container without noticing, not only cooking will not be performed well, but also the moisture of the ingredients leaking from the pot-shaped container will enter the electric system etc. of the heating cooker Improvements have been sought because it may damage the cooker and cause electrical leakage.

  This invention was made in order to solve the above-mentioned subject, and it aims at obtaining the heating cooker which improves safety by guiding the water which leaked from the pan-like container to the predetermined storage space. . Furthermore, it aims at obtaining the cooking device which can detect the failure | damage of a pan-like container at an early stage, and the crack detection method of the pan-like container.

  In order to solve the above-described problems and achieve the object, a heating cooker according to the present invention includes a pan-like container, a main body provided with an accommodating portion for accommodating the pan-like container, and a pan-like container provided in the main body. In the cooking device having a heating means for heating the water, there is provided a discharging means for discharging the water leaked from the pot-like container into the effective storage space of the storage portion to the outside of the effective storage space.

  Furthermore, the other cooking device according to the present invention includes a pot-shaped container, a main body that accommodates the pot-shaped container, a heating means that is provided in the main body and heats the pot-shaped container, and a crack that detects breakage of the pot-shaped container. Detecting means, notifying means for notifying that the pan-like container is broken, and crack detection control means for notifying that the pot-like container has been damaged by operating the notifying means based on the damage judgment result from the crack detecting means; have.

  Moreover, the method for detecting cracks in a pan-like container of a heating cooker according to the present invention includes a pan-like container, a main body that accommodates the pan-like container, and heating means that is provided in the main body and heats the pan-like container. A method for detecting cracks in a pot-shaped container of a vessel, storing a current value flowing in the heating means when the pot-shaped container is normal in a storage means in advance, measuring a current value actually flowing in the heating means, When the difference between the two current values is equal to or greater than a predetermined threshold value, it is determined that the pan-like container is broken.

  In addition, another method for detecting cracks in a pan-like container of a heating cooker according to the present invention includes: a pan-like container; a main body provided with a housing portion that accommodates the pan-like container; and a pan-like container provided in the main body. A method for detecting cracks in the pan-like container of a heating cooker having a heating means, wherein a temperature sensor is disposed at the bottom of the housing portion, and when the temperature detected by the temperature sensor has a sudden change The presence of water leaking from the pan-like container is detected, and it is determined that the pan-like container has been damaged.

  According to this invention, since the water leaked from the pan-like container is guided to the predetermined storage space by the discharging means, safety can be improved. Moreover, according to the crack detection method of the pan-shaped container of the heating cooker which concerns on this invention, the crack (breakage) of a pot-shaped container can be detected at an early stage, and damage can be minimized.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a heating cooker and a method for detecting cracks in a pot-shaped container according to the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIG. 1 is a cross-sectional view of an electromagnetic induction heating rice cooker which is Embodiment 1 of the heating cooker according to the present invention. In FIG. 1, the electromagnetic induction heating rice cooker 100 opens and closes the upper opening part of the rice cooker main body 1 via the rice cooker main body 1 with the upper part opened and the hinge part (not shown) provided at the rear upper part of the rice cooker main body 1. Electromagnetic induction of the inner pot 3 provided in the rice cooker body 1, the lid 2 attached so as to be freely covered, the inner pot 3 which is a pot-shaped container detachably accommodated in the rice cooker body 1 It has the heating coil 4 which is a heating means to heat.

  The rice cooker body 1 has a body case 5 that constitutes the exterior and interior of the rice cooker body 1. The main body case 5 is formed in a substantially cylindrical shape and forms an outer wall 6a and an upper frame 6b of the rice cooker main body 1 and an upper case 6 and is configured integrally with the upper case 6, and an outer peripheral end portion is an outer wall 6a of the upper case 6. The lower case 7 which is joined to the lower end of the rice cooker body 1 to form the bottom surface 7a of the rice cooker body 1, and the upper case 6 is joined to the upper frame 6b of the upper case 6 which is substantially cylindrical and has a substantially cylindrical shape. The inner case 8 that forms the inner wall of the inner pot 3 and forms a part of the accommodating portion 10 of the inner pot 3 and the upper case 8 is formed in a shape that substantially forms a bowl shape and covers the lower portion of the inner pot 3. A coil base 9 which is integrally coupled to the lower end of the inner casing 8 to form the accommodating portion 10 of the inner pot 3 together with the inner case 8 and further forms the bottom surface 9a of the accommodating portion 10 and the heating coil 4 is disposed on the lower surface side. It is constituted by. The upper end portion of the inner case 8 is a flange portion 8a having a shape that is formed by bending a predetermined width outward over the entire circumference. And 3 support protrusions 8b which support the inner pot 3 are formed on this flange part 8a.

  A heating coil 4 for electromagnetic induction heating is disposed on the lower surface of the coil base 9. The heating coil 4 is composed of an inner coil 4a provided on the flat part on the back surface of the coil base 9 and an outer coil 4b provided on the curved part on the outer peripheral side. The inner coil 4a and the outer coil 4b are swirled in a spiral shape and connected in series, and are supplied with a high-frequency current.

  A sensor hole 9b for arranging the pan bottom temperature sensor 13 is drilled at a substantially central part of the coil base 9 forming the bottom surface 9a of the housing part 10. And the substantially cylindrical pan-bottom temperature sensor 13 is arrange | positioned in the sensor hole 9b so that it can protrude from the sensor hole 9b. The pan bottom temperature sensor 13 is urged by a compression spring 14 that is contracted between the bottom surface 7 a and the upper end surface of the pan bottom temperature sensor 13 abuts against the bottom rear surface of the inner pan 3. The pan bottom temperature sensor 13 measures the temperature of the inner pan 3 in such a state that the upper end surface is in contact with the bottom rear surface of the inner pan 3.

  The lid body 2 is provided with a mounting hole 18a in which a steam discharge device 20 having a steam port 20a is detachably mounted substantially at the center, and an outer lid 18 that forms the upper surface side of the lid body 2; The inner lid 19 is disposed below and has an opening hole 19a into which the vapor discharge device 20 is mounted, and forms the lower surface side of the lid body 2. A lid packing 24 is attached to the outer peripheral edge of the inner lid 23 to press-contact the flange 3a of the inner pot 3 placed on the upper frame 6b of the main body case 5 so as to keep the inner pot 3 airtight. An operation panel 15 having a rice cooking switch, a reservation switch, and the like is provided on the front side of the outer lid 18. On the front side of the outer lid 18, an electronic sound speaker 17 that further informs the abnormality of the rice cooker by sound is provided. A microcomputer 16 is disposed inside the outer lid 18 that is the back surface of the operation panel 15.

FIG. 2 is a perspective view showing how the inner pot 3 is accommodated in the accommodating portion 10. In FIG. 2, the inner pot 3 is comprised from the inner pot main body 3a which comprises a substantially bowl shape, and the flange part 3b formed in the bowl shape over the perimeter to the outer side from the opening part of this inner pot main body 3a. . The material of the inner pot 3 is composed of a 95% to 100% carbon fired body having good heat conduction as a base material, and a fluorine coating or the like is applied to the inside. When the inner pot is composed of carbon, so-called charcoal, first, the charcoal is heated to generate infrared rays, so that delicious rice can be cooked. In addition, the charcoal deodorizing action absorbs the tap water and makes it possible to cook tasty and delicious rice. Since the fired body is relatively easy to break, it is composed of 4 to 10 mm which is approximately 2 to 5 times the plate thickness of the conventional metal container. For this reason, even if it is the inner pot 3 which made the fired body a base material, sufficient intensity | strength is obtained. Furthermore, the specific gravity of the inner pot 3 is approximately 1.7 g / cm ³ , which is lighter than a metal container, and aluminum of the same dimensions is 1.5 times, iron is 4.3 times, and copper is 4 times. .8 times the weight, approximately 2 to 5 times the plate thickness, which is equivalent to the conventional metal container. The inner pot 3 having such a configuration is inserted into the accommodating portion 10 as indicated by an arrow in FIG. 2, and is supported by the three support protrusions 8b that come into contact with the back surface of the flange portion 3b, and is placed at a proper position. . At this time, the center part of the back surface of the inner pot body 3 a contacts the pot bottom temperature sensor 13.

  FIG. 3 is a perspective view in which a part of the side wall of the housing portion 10 is deleted so that the state of the escape groove 11 formed on the bottom surface 9a of the housing portion 10 can be well understood. In FIG. 3, a sensor hole 9 b for arranging the pan bottom temperature sensor 13 is drilled at a substantially central portion of the bottom surface 9 a of the housing portion 10. Around the sensor hole 9b, an inflow prevention bank 9c formed by raising the hole edge over the entire circumference is provided for the purpose of preventing water from flowing into the sensor hole 9b. And in this Embodiment, in order to collect the water (including the water | moisture content and juice in a foodstuff) which leaked from the crack etc. of the inner pot 3 to the bottom face 9a of the accommodating part 10, sensor hole 9b and Concentric escape grooves (water escape recesses) 11 are formed. The escape groove 11 is formed in an annular shape with a U-shaped cross section so as to protrude between the inner coil 4 a and the outer coil 4 b provided on the back surface of the coil base 9. In accordance with this, a slight gradient (water gradient) is provided on the bottom surface 9a of the accommodating portion 10 so that water flows into the escape groove 11 satisfactorily.

  FIG. 4 is a cross-sectional view of the housing portion 10 for explaining the housing effective space 40. The storage effective space 40 is a space indicated by a dotted line in FIG. 4 provided in the storage portion 10 along the shape of the inner pot 3 as a space for storing the inner pot 3. An escape groove (water escape recess) 11 formed on the bottom surface 9 a of the storage portion 10 is provided so as to protrude from the effective storage space 40, and water leaked into the effective storage space 40 from the inner pot 3. The discharge means for discharging outside the effective storage space 40 is configured. Since the discharging means is a recess formed in the bottom surface 9a of the housing portion 10 as in the present embodiment, it can be realized by a simple method of simply providing the recess without increasing the number of parts, and the cost You can go down.

  The escape groove 11 according to the present embodiment is formed concentrically with respect to the inner coil 4a and the outer coil 4b. By making it concentric, the effect that the space between the inner side coil 4a and the outer side coil 4b can be used effectively is acquired. However, except for this point, the escape groove 11 does not necessarily have to be formed concentrically, and may be a recess formed so that water can be collected on the bottom surface 9a of the accommodating portion 10, and has substantially the same effect. Obtainable.

  FIG. 5 is an electrical system diagram schematically showing an electrical system of the electromagnetic induction heating rice cooker 100 of the present embodiment. The microcomputer 16 that functions as the center of control is provided with a main control unit 16a, a drive control unit 16b, a current detection unit 16c, and a crack detection control unit 16d as functional units related to the present embodiment. The microcomputer 16 is electrically connected to a drive circuit 35 that supplies power from an AC power source to drive the heating coil 4, a pan bottom temperature sensor 13, an operation panel 15, and an electronic sound speaker 17. The main control unit 16a controls the drive circuit 35 via the drive control unit 16b to perform a rice cooking (cooking) operation. The current detector 16c detects the current flowing through the heating coil 4 via the drive circuit 35 and the drive controller 16b. The crack detection control part 16d performs the crack detection operation | movement of the inner pot 3 from the output of the pot bottom temperature sensor 13, etc. FIG. This crack detection operation will be described later.

  FIG. 6 is a functional configuration diagram showing a functional configuration of the electromagnetic induction heating rice cooker 100. The control means M01 is mainly comprised by the main control part 16a, and performs comprehensive control including control of rice cooking (cooking) operation | movement. The heating means M02 is mainly composed of the drive circuit 35 and the heating coil 4, and heats the inner pot 3 based on an instruction from the control means M01. The operation input means M03 is constituted by the operation panel 15 and accepts various operation inputs (signals). The notification unit M04 includes the electronic sound speaker 17 and the operation panel 15, and notifies various states and abnormalities. The crack detection means M06 is comprised from the pan bottom temperature sensor 13, the electric current detection part 16c, and the crack detection control part 16d, and judges whether the inner pot 3 is damaged. The crack detection control means M05 operates the notification means M04 based on the crack determination result of the crack detection means M06 to notify that the inner pot 3 has been damaged.

  FIG. 7 is a graph showing the difference in current flow between the inner pot without cracks and the inner pot with cracks. The vertical axis represents the current flowing through the heating coil 4, and the horizontal axis represents the change in time. When the heating coil 4 is operated, an eddy current is generated in the inner pot 3 and the temperature of the inner pot 3 rises. At this time, as indicated by a solid line in FIG. 7, the current flowing through the heating coil 4 gradually increases as time passes and becomes constant at a predetermined magnitude in a predetermined period after the power is turned on. On the other hand, when a crack or a crack occurs in the inner pot 3, the flow of eddy current flowing in the inner pot 3 changes, the impedance of the inner pot 3 shifts, and the current does not easily flow through the heating coil 4. As a result, it changes as shown by a dotted line in FIG. 7 (it is constant at a current smaller than the inner pot without cracks).

  Using this phenomenon, the change in current in the case of the inner pot 3 without cracks is stored in the microcomputer 16 in advance, and the current flowing in the heating coil 4 is actually compared with this to break the inner pot 3. This is detected and notified by sound or display.

  FIG. 8 is a flowchart showing an example of the operation of the crack detection control unit 16d. The crack detection control unit 16d is activated when the power is turned on, and operates according to a crack detection event that is instructed as needed from various operations such as a rice cooking operation (cooking operation) and a heat retaining operation performed by the main control unit 16a. When a crack is detected, an event of operation stop is issued to the main control unit 16a, and then notification that a crack has occurred is made using the notification means. In FIG. 8, the crack detection control unit 16d always monitors whether or not there is a crack detection event after activation (step S1). The crack detection event is issued, for example, at the beginning of cooking (cooking), cooking (cooking), keeping warm, turning on the power, and setting the inner pot 3.

  If there is a crack detection event, it is determined whether or not the heating operation is being performed, that is, whether or not the heating coil 4 is in operation. If the heating operation is not being performed, the crack detection operation is not performed (step S2). On the other hand, when the heating operation is being performed, the actual crack detection operation is started, and whether the eddy current actually flowing is within the specified range as compared with the current value stored in the microcomputer 16 in advance. (Step S3), if it is within the specified range, it is determined that no crack has occurred in the inner pot 3, and does nothing and enters a waiting state for the next crack detection event. If so, an event of operation stop is issued to the main control unit 16a (step S4), and then an electronic sound is generated by the electronic sound speaker 17, and a display with a crack is displayed on the operation panel 15 to notify the user to that effect. (Step S5).

  When rice is cooked in the electromagnetic induction heating rice cooker 100 configured as described above, first, the inner pot 3 containing a predetermined amount of rice and water is placed in the rice cooker main body 1 (the housing portion including the inner case 8 and the coil base 9). 10) and the lid 2 is closed. Next, when the rice cooker is turned on and the rice cooker switch on the operation panel 15 provided on the front side of the rice cooker body 1 is pressed, the main controller 16 a provided in the microcomputer 16 energizes the heating coil 4. When the heating coil 4 is driven with an alternating current, the magnetic flux of the alternating magnetic field generated by the heating coil 4 generates an eddy current in the inner pot 3. The inner pot 3 generates heat due to this eddy current and its own electrical resistance. Based on such a principle, the main controller 16a generates an eddy current on the bottom surface of the inner pot 3 to cause the inner pot 3 to generate heat, and starts the rice cooking operation. And based on the detection temperature of the pan bottom temperature sensor 13, each process of preheating, rice cooking, and murashi is controlled, and the rice in the inner pot 3 is cooked. The main control unit 16a issues a crack detection event as necessary, and performs a crack detection operation of the inner pot 3.

  As described above, the electromagnetic induction heating rice cooker 100 according to the present embodiment is a discharge unit that discharges the water leaked from the inner pot 3 into the accommodation effective space 40 of the accommodation unit 10 to the outside of the accommodation effective space 40. Since the escape groove 11 is provided, even if a crack or the like enters the inner pot 3 and the water leaks out, the water can be guided to a predetermined storage space and reach a weak part of the water such as an electric system. Therefore, safety can be improved.

  Moreover, since the material of the inner pot 3 is a sintered body of carbon 95% to 100% and is a material that breaks against impact, a higher effect can be obtained. In addition, even if it is not a carbon fired body, if it is an inner pot made of a material that is easily broken, such as ceramic, glass, and earthenware, the same effect can be obtained.

  Further, since the bottom surface 9a of the accommodating portion 10 has a water gradient so that the leaked water flows toward the escape groove 11, the leaked water is collected well and safety is ensured. Will improve.

  Furthermore, the electromagnetic induction heating rice cooker 100 of this Embodiment is the crack detection means which detects the damage of the inner pot 3, the alerting | reporting means which alert | reports that the inner pot 3 was damaged, and the damage judgment result from a crack detection means. Since it has a crack detection control means for operating the notifying means based on the above and notifying that the inner pot 3 has been damaged, the damage to the inner pot 3 can be known at an early stage, and the safety is further improved.

  In addition, although the damage detection of the inner pot 3 of this Embodiment is performed by operation | movement of the crack detection control part 16d which is called from the main control part 16a as needed and operate | moves, it does not necessarily need to be this method, That is, the current value flowing through the heating coil 4 when the inner pot 3 is normal is stored in advance in the storage means and the difference between the current value actually flowing through the heating coil 4 is compared. If it is a method which judges that the inner pot 3 has broken when it is more than a predetermined threshold value, the same effect will be acquired.

Embodiment 2. FIG.
FIG. 9 is a cross-sectional view of an electromagnetic induction heating rice cooker that is Embodiment 2 of the heating cooker according to the present invention. FIG. 10 is a partially enlarged view showing the vicinity of the storage tank of FIG. 9 in an enlarged manner. 9 and 10, in the electromagnetic induction heating rice cooker 110 according to the present embodiment, the water that leaks from the inner pot 3 into the effective storage space 40 of the storage unit 10 is discharged out of the effective storage space 40. As a means, a communication passage 32, which is a water escape through hole, is formed on the bottom surface of the escape groove 11. Further, a storage tank 31 that communicates with the communication path 32 and stores water leaked from the inner pot 3 is provided. Furthermore, a thermistor 33 as a water detection sensor for detecting water leaking from the inner pot 3 is provided on the bottom surface of the escape groove 11.

  FIG. 11 is an electrical system diagram schematically showing an electrical system of the electromagnetic induction heating rice cooker 110 of the present embodiment. A thermistor 33 is connected as a component electrically connected to the microcomputer 16. In the present embodiment, in the functional configuration diagram shown in FIG. 6, the crack detection means M06 includes a thermistor 33 as a water detection sensor and a crack detection control unit 16d. Other configurations are the same as those of the first embodiment.

  FIG. 12 is a graph showing a difference in temperature detected by the thermistor 33 as a water detection sensor when the inner pan is not cracked and when the inner pan is cracked. The vertical axis represents the temperature detected by the thermistor 33, and the horizontal axis represents the change in time. In the inner pot 3 having no cracks, the thermistor 33 always comes into contact only with air, so the temperature gradually rises as the heating time elapses. On the other hand, in the cracked inner pot 3, when the leaked water contacts the thermistor 33, the temperature changes abruptly (depending on the water temperature). The crack detection control unit 16d detects this rapid temperature change and detects a crack in the inner pot 3.

  FIG. 13 is a flowchart showing an example of the operation of the crack detection control unit 16d of the present embodiment. The operations in steps S11, S12, S14, and S15 are the same as the operations in steps S1, S2, S4, and S5 in the flowchart of the first embodiment shown in FIG. In this embodiment, in step S3, which is a substantial crack detection operation, the crack detection control unit 16d detects a sudden temperature change in the output of the thermistor 33, and if there is a sudden temperature change, It is judged that the presence of the discharged water, that is, the inner pot 3 has cracked. Here, the detection of the rapid temperature change is made by, for example, storing the temperature of the inner pot 3 measured last time in the microcomputer 16 and judging from the passage of time and the change (difference) in temperature. When it is determined that a crack has occurred in the inner pot 3, as in the first embodiment, an event of operation stop is issued to the main control unit 16a (step S4), and then an electronic sound is generated by the electronic sound speaker 17 At the same time, the operation panel 15 is displayed as cracked to notify the user of that fact.

  In step S3, the crack detection control unit 16d of the present embodiment stores the temperature measured by the thermistor 33 in the previous time in the microcomputer 16, and abruptly changes from the passage of time (difference) and the temperature change. Although the temperature change is detected, the present invention is not limited to this method. For example, the temperature change at the time of the inner pot without a crack shown by a solid line in FIG. When the measured temperature is more than the threshold with respect to the temperature change indicated by this curve, it may be determined that the leaked water has been detected (the inner pot 3 has been damaged).

  In the present embodiment, as a discharge means for discharging water leaked from the inner pot 3 into the effective storage space 40 of the storage unit 10 to the outside of the effective storage space 40, a water escape through hole is provided on the bottom surface of the escape groove 11. Since a certain communication path 32 is formed, even if the amount of water that the inner pot 3 breaks and leaks increases, water does not remain in the accommodation effective space 40, and safety is improved. Moreover, since the storage tank 31 which stores the water which leaked from the inner pot 3 in communication with this communication path 32 is provided, the water which went out of the accommodation effective space 40 through the communication path 32 is a rice cooker main body. There is no going out of 1 and it doesn't pollute the room.

Embodiment 3 FIG.
FIG. 14 is a partially enlarged view showing the vicinity of a storage tank of an electromagnetic induction heating rice cooker which is Embodiment 3 of the heating cooker according to the present invention. In the present embodiment, as a sealing means for sealing the sensor hole 9b, a resinous sliding seal member 37 is stuck around the pan bottom temperature sensor 13 over the entire circumference. The sliding seal member 37 hermetically closes and seals between the pan bottom temperature sensor 13 and the sensor hole 9b, and the outer surface of the sliding seal member 37 and the sensor hole 9b so as not to prevent the panning operation of the pan bottom temperature sensor 13. It is possible to slide with a small frictional force with the inner surface.

  In the electromagnetic induction heating rice cooker having such a configuration, since the sealing means is the sliding seal member 37 provided between the pan bottom temperature sensor 13 and the sensor hole 9b, the inner pan 3 and the pan bottom temperature sensor 13 The sensor hole 9b can be sealed without obstructing the contact, and water leakage from the sensor hole 9b can be prevented without degrading the sensitivity of the pan bottom temperature sensor 13.

Embodiment 4 FIG.
FIG. 15: is the elements on larger scale which expand and show the vicinity of the storage tank of the electromagnetic induction heating rice cooker which is Embodiment 4 of the heating cooker which concerns on this invention. In the present embodiment, a resin cover member 39 that covers the sensor hole 9b as a whole together with the pan bottom temperature sensor 13 is provided as a sealing means for sealing the sensor hole 9b. In addition, since the pan bottom temperature sensor 13 contacts the inner pan 3 through the resin cover member 39, sensitivity falls. That is, while detecting this with a predetermined time delay with respect to the temperature change of the actual pan-bottom temperature sensor 13, it will detect low predetermined temperature. Therefore, various controls are performed in consideration of this predetermined value.

  In the electromagnetic induction heating rice cooker having such a configuration, since the sealing means for sealing the sensor hole 9b is the resin cover member 39 that covers the sensor hole 9b as a whole together with the pan bottom temperature sensor 13, the sealing performance is improved and the sensor is improved. The flow of water into the hole 9b can be reliably prevented, and the shape of the resin cover member 39 is simple and can be manufactured at low cost. In addition, although the pan bottom temperature sensor 13 used in this Embodiment is a contact type, it is not restricted to this, For example, you may use non-contact type sensors, such as an infrared temperature sensor. In this case, the resin cover member 39 is made of an infrared transmitting resin or the like. By using such a non-contact type sensor, the sensitivity of the sensor is not lowered, and therefore accurate control can be performed.

  In addition, although Embodiment 1-4 is giving all the examples of an electromagnetic induction heating rice cooker, this invention is not restricted to an electromagnetic induction heating rice cooker, but the accommodating part which accommodates a pot-shaped container and a pot-shaped container. Any cooking device may be used as long as the cooking device has a main body provided and heating means provided on the main body for heating the pan-like container.

  The present invention is suitable for a heating cooker that heats and cooks food stored in a pot-shaped container, and in particular, a heating equipped with a pot-shaped container made of a fragile material such as charcoal, ceramic, glass, and earthenware. It is suitable for a cooking device, and is particularly suitable for application to an electromagnetic induction heating rice cooker equipped with an inner pan made of charcoal and using rice as a food material.

It is a cross-sectional view of the electromagnetic induction heating rice cooker which is the heating cooker of Embodiment 1 which concerns on this invention. It is a perspective view which shows a mode that an inner pot is accommodated in the accommodating part of the electromagnetic induction heating rice cooker of Embodiment 1. FIG. It is a perspective view which removes a part of side wall of an accommodating part, and shows it so that the state of the escape groove formed in the bottom face of the accommodating part of the electromagnetic induction heating rice cooker of Embodiment 1 may be understood well. It is sectional drawing of the accommodating part for demonstrating the accommodation effective space of the electromagnetic induction heating rice cooker of Embodiment 1. FIG. It is an electric system figure which shows typically the electric system of the electromagnetic induction heating rice cooker of Embodiment 1. FIG. It is a functional block diagram which shows the functional structure of the electromagnetic induction heating rice cooker of Embodiment 1. FIG. It is a graph which shows the difference in the way of the electric current flow of the inner pot without a crack of Embodiment 1, and the inner pot with a crack. 4 is a flowchart illustrating an example of an operation of a crack detection control unit according to the first embodiment. It is a cross-sectional view of the electromagnetic induction heating rice cooker which is Embodiment 2 of the heating cooker which concerns on this invention. It is the elements on larger scale which expand and show the vicinity of the storage tank of FIG. It is an electric system figure which shows typically the electric system of the electromagnetic induction heating rice cooker of Embodiment 2. FIG. It is a graph which shows the difference of the temperature which a water detection sensor detects at the time of the inner pot with a crack, and the time of an inner pot with a crack. 6 is a flowchart illustrating an example of an operation of a crack detection control unit according to the second embodiment. It is the elements on larger scale which expand and show the vicinity of the storage tank of the electromagnetic induction heating rice cooker which is the heating cooker of Embodiment 3 which concerns on this invention. It is the elements on larger scale which expand and show the vicinity of the storage tank of the electromagnetic induction heating rice cooker which is the heating cooker of Embodiment 4 which concerns on this invention.

Explanation of symbols

1 Rice cooker body (main body)
2 Lid 3 Inside pan (pan-shaped container)
4 Heating coil (heating means)
DESCRIPTION OF SYMBOLS 5 Main body case 6 Upper case 7 Lower case 8 Inner case 9 Coil stand 9a Bottom surface of accommodating part 9b Sensor hole 9c Inflow prevention bank 10 Accommodating part 11 Escape groove (water escaping recessed part: discharging means)
13 Pan bottom temperature sensor (temperature sensor)
15 Operation panel 16 Microcomputer (storage means)
17 Electronic sound speaker (notification means)
31 storage tank 32 communication path (water escape through hole: discharge means)
33 Thermistor (Water detection sensor)
37 Sliding seal member (sealing means)
39 Resin cover member (sealing means)
40 Storage space 100,110 Electromagnetic induction heating rice cooker

Claims (13)

A pot-shaped container,
A main body provided with an accommodating portion for accommodating the pan-like container;
In a heating cooker having heating means provided on the main body and heating the pan-like container,
Discharging means for discharging water leaking from the pot-like container into the effective storage space of the storage portion to the outside of the effective storage space is provided,
Crack detection means for detecting breakage of the pan-like container;
Informing means for informing that the pan-like container has been damaged,
Further comprising a crack detection control means for notifying that the pan-like container is broken by operating the notifying means based on the damage judgment result from the crack detecting means,
The crack detection means compares the difference between the current value flowing in the heating means when the pan-shaped container stored in advance is normal and the current value actually flowing in the heating means, and the difference between both current values is When the temperature is equal to or greater than a predetermined threshold, it is determined that the pan-like container is broken . The cooking device according to claim 1, wherein a material of the pot-shaped container is a material that can break against an impact. The cooking device according to claim 1 or 2, wherein a bottom surface of the housing portion has a water gradient toward the discharge means so that the leaked water flows toward the discharge means. The cooking device according to any one of claims 1 to 3, wherein the discharge means is a water escape recess formed on a bottom surface of the housing portion. The cooking device according to any one of claims 1 to 4, wherein the discharging means is a water escape through hole provided through the bottom surface of the housing portion. The cooking device according to claim 5, further comprising a storage tank that communicates with the water escape through hole and stores water leaked from the pan-like container. It further has a pan bottom temperature sensor that contacts the bottom of the bottom of the pan-like container and measures the temperature of the pan-like container, and a sensor hole penetrates the bottom of the housing portion in order to dispose the pan-bottom temperature sensor. The cooking device according to any one of claims 1 to 6, wherein a sealing means is provided for sealing the sensor hole. The pan bottom temperature sensor is arranged so as to be able to protrude and retract from the sensor hole,
The cooking device according to claim 7, wherein the seal means is a sliding seal member provided between the temperature sensor and the sensor hole. The cooking device according to claim 7, wherein the sealing means is a resin cover member that entirely covers the sensor hole together with the pan bottom temperature sensor. A pot-shaped container,
A main body for accommodating the pan-like container;
A heating means provided in the main body for heating the pot-like container;
Crack detection means for detecting breakage of the pan-like container;
Informing means for informing that the pan-like container has been damaged,
It possesses a crack detection control means for notifying that said pot-like container by operating the notification means based on the failure determination result from the breakage detecting means is damaged,
The crack detection means compares the difference between the current value flowing in the heating means when the pan-shaped container stored in advance is normal and the current value actually flowing in the heating means, and the difference between both current values is When the temperature is equal to or greater than a predetermined threshold, it is determined that the pan-like container is broken . The said crack detection means operate | moves at least in the initial stage of cooking, during cooking, during heat retention, at the time of power-on, and at the time of a pot-like container setting, The any one of Claim 1 to 10 characterized by the above-mentioned. Cooking device. The crack detection means determines that the pan-like container is damaged when a sudden temperature change is detected as compared with the temperature change of the pan-like container when the pan-like container stored in advance is normal. The heating cooker according to any one of claims 1 to 10 , wherein: A pot-shaped container,
A main body for accommodating the pan-like container;
A method of detecting cracks in the pan-like container of a heating cooker having heating means provided in the main body for heating the pan-like container,
The current value that flows through the heating unit when the pan-like container is normal is stored in advance in the storage unit, the current value that actually flows through the heating unit is measured, and the difference between the two current values is equal to or greater than a predetermined threshold value. When it is, it determines that the said pot-shaped container was damaged. The crack detection method of the pot-shaped container of the heating cooker characterized by the above-mentioned.

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