JP6270906B2 - Temperature detector and cooking device - Google Patents

Description

  The present invention relates to a temperature detection device that detects the temperature of a container in which an object to be heated is stored, and a cooking device that performs a cooperative operation with the temperature detection device.

  In a conventional cooking device, it is known to detect the temperature of a container such as a pot in which ingredients are stored and to automatically perform heating control based on the detected temperature. For example, the heating cooker described in Patent Document 1 includes an infrared sensor on the lower surface of the top plate, detects infrared rays radiated from the bottom of the pan, calculates the pan bottom temperature, and performs heating control. . Moreover, in patent document 2 and patent document 3, a temperature sensor is arrange | positioned in the height direction of the inside of a pan bottom or the side surface of a pan, and the detected temperature information is transmitted to a heating cooker, and a heating control is performed. Is described. Further, Patent Document 4 includes a pan bottom portion and a handle attached to the pan body, and a temperature sensor is arranged on the pan bottom portion, and temperature information detected by the temperature sensor is transmitted via a communication circuit provided on the handle. The structure to be described is described.

JP 2003-249341 A (refer to claim 1) JP 2007-53038 A (see FIG. 1) Japanese Patent No. 4936814 (see FIG. 1) JP 2012-514495 A (see FIG. 12)

  In the case of the configuration described in Patent Document 1, a part of infrared rays emitted from the bottom of the pan is shielded (absorbed and reflected) by the top plate, and the emissivity of infrared rays is increased by the material and surface treatment of the bottom of the container. It is difficult to detect an accurate temperature due to factors such as differences.

  Further, in the case of the configurations described in Patent Document 2 and Patent Document 3, since the influence on the temperature detection by the top plate is eliminated, the followability and accuracy of temperature detection can be improved. However, only specific pans with temperature sensors inside can be used. Furthermore, in the case of the configuration described in Patent Document 4, since it is necessary to attach the pan bottom and the handle, the shape of the pan is limited, and the pan cannot be adapted to any shape. In addition, by providing parts such as a temperature sensor or a communication circuit on the pan or the handle, the pan becomes large and heavy, and the usability is deteriorated.

  The present invention has been made in the background of the above problems, and an object thereof is to provide a temperature detection device and a heating cooker that can detect the temperature of containers of various shapes with high accuracy.

Temperature sensing device according to the present invention includes a plurality of protrusions for contacting a container to be heated is accommodated is placed, a flat mounting portion, the mounting portion protruding upward, the container and a plurality A plurality of temperature sensors that are respectively disposed in the protrusions of the plurality of temperature sensors and that detect the temperature of the container, a heat insulating layer that is disposed below the plurality of temperature sensors, and a temperature that is connected to the placement unit and is detected by the plurality of temperature sensors. And a plurality of lead wires respectively connecting the plurality of temperature sensors to the first communication unit, and the plurality of lead wires are directed from the plurality of temperature sensors toward the outline of the placement unit. Ru is arranged so as to extend radially.

  According to the temperature detection device of the present invention, by arranging the temperature sensor on the mounting portion on which the container is mounted, the temperature of various shapes of the container can be detected and the degree of contact with the container can be improved. it can. Furthermore, by providing a heat insulation layer below the temperature sensor, the influence of the temperature of the top plate when the temperature detection device is placed on the top plate of the cooking device is suppressed, and the detection accuracy of the container by the temperature sensor is improved. To do.

3 is a perspective view of a heating cooker according to Embodiment 1. FIG. It is a figure explaining the structure and function of the principal part of the heating cooker in Embodiment 1. FIG. It is a figure explaining the operation display part of the heating cooker in Embodiment 1. FIG. 1 is a perspective view of a temperature detection device in Embodiment 1. FIG. 2 is a plan view of the temperature detection device in Embodiment 1. FIG. FIG. 3 is a diagram illustrating an internal configuration of a temperature detection device in the first embodiment. It is a graph which shows the relationship between the distance from a top plate to the bottom part of a container, and heating efficiency. 6 is a plan view of a temperature detection device according to Embodiment 2. FIG. 6 is a plan view of a temperature detection device in Embodiment 3. FIG. FIG. 6 is a schematic side view of a temperature detection device in a third embodiment. 6 is a schematic cross-sectional view of a temperature detection device in Embodiment 4. FIG. FIG. 10 is a schematic cross-sectional view of a temperature detection device in a fifth embodiment. FIG. 10 is a schematic cross-sectional view of a temperature detection device in a modification of the fifth embodiment. It is a figure which shows an example of arrangement | positioning of the projection part in the temperature detection apparatus of a modification.

  Hereinafter, embodiments of a temperature detection device and a heating cooker according to the present invention will be described with reference to the drawings. Note that the detailed structure and overlapping or similar descriptions are appropriately simplified or omitted. In the following embodiments, an induction heating cooker will be described as an example of a heating cooker.

Embodiment 1 FIG.
(Configuration of cooking device)
FIG. 1 is a perspective view of a heating cooker 100 according to Embodiment 1 of the present invention. The heating cooker 100 includes a main body 1 and a top plate 2 that is disposed on the upper surface of the main body 1 and is formed of heat-resistant glass, and a container 10 such as a pan or a frying pan placed on the top plate 2. Heating is performed by a heating unit provided inside the main body 1. In the present embodiment, heating ports 6 are respectively provided at three locations on the left side of the top plate 2, on the right side, and on the center side.

  The main body 1 accommodates a grill 9 for cooking food such as fish. A grill heater (not shown) serving as a heat source for heating the food placed on the grill 9 is provided inside the grill 9. Next to the grill 9, for example, a dial switch is used, and a front operation display unit 4 that receives an input operation of a heating condition or a heating instruction, and a power source that is operated to turn on / off the heating cooker 100. A switch 4a is arranged.

  On the front side of the top plate 2, an operation display unit 3 that receives an input operation of a heating condition or a heating instruction and displays a heating state is arranged. The operation display unit 3 includes, for example, a capacitance switch and a liquid crystal panel. Further, a thermal power display unit 5 is provided on the front side of each heating port 6. The thermal power display unit 5 displays thermal power in a plurality of stages, and the display mode is switched according to the thermal power. The thermal power display unit 5 includes, for example, a plurality of LEDs, and expresses thermal power by switching the lighting states (lighting, extinguishing, blinking, etc.) of these LEDs or switching the lighting color. As a result, the user can be notified of the thermal power that is easy to understand intuitively.

  The user places the container 10 containing the object to be heated on the top plate 2 and operates the operation display unit 3 or the front operation display unit 4 corresponding to the heating port 6 to set the heating conditions and the like. According to the set content, the container 10 is heated by the heating unit. Information related to settings such as the progress of heating and cooking mode is displayed on the operation display unit 3, and the heating power is displayed on the heating power display unit 5 arranged corresponding to each heating port.

  In addition, a portion of the top plate 2 corresponding to the heating port 6 is provided with, for example, a circular display indicating a place where the container 10 is placed by printing or the like, and the user has a place where the container 10 should be placed. It has come to understand.

  A heating coil 14 is provided below the heating port 6 in the main body 1. The heating coil 14 corresponds to the “heating unit” of the present invention. In addition, in FIG. 1, arrangement | positioning of the heating coil 14 is illustrated with the broken line. By supplying a high-frequency current to the heating coil 14, an eddy current is generated in the container 10 placed on the top plate 2, and the container 10 generates heat due to the resistance between the generated eddy current and the container 10. Thereby, cooking with good heating efficiency for directly heating the container 10 can be realized. In addition, you may provide other heating parts, such as an electric heater, as a heating part of the heating port 6 of the heating cooker 100. FIG.

  A plurality of exhaust ports 7 are provided on the back side of the top plate 2. The exhaust port 7 is disposed so as to communicate with the inside of the main body 1. The air taken into the main body 1 is exhausted from the exhaust port 7. An air permeable cover (not shown) that prevents dust and other foreign matter from entering the inside of the main body 1 may be provided on the upper portion of the exhaust port 7.

  Further, a communication port 8 for performing wireless communication with a temperature detection device 30 described later is provided in front of the exhaust port 7. The communication port 8 is made of a material having high radio wave transparency such as glass fiber reinforced plastic (GFRP) resin. In FIG. 1, the communication port 8 is disposed between the heating port 6 and the exhaust port 7 so that the radio wave is not shielded by the container 10 placed on the upper surface of the top plate 2. However, the position of the communication port 8 is not limited to this. For example, the communication port 8 may be arranged at a position where the distances to the heating ports 6 are equal. Alternatively, the communication port 8 may be provided as a part of the operation display unit 3.

  FIG. 2 is a diagram for explaining a configuration and functions of main parts of the heating cooker 100 according to the present embodiment. In FIG. 2, only the configuration corresponding to one heating port 6 is shown, and for example, a container 10 in which an object to be heated such as water or food is accommodated, and a temperature detection device that detects the temperature of the container 10. 30 together. The temperature detection device 30 is provided separately from the cooking device 100, detects the temperature of the bottom of the container 10, and transmits information on the detected temperature to the cooking device 100. Details of the temperature detection device 30 will be described later.

  As shown in FIG. 2, a heating coil 14 is disposed below the heating port 6 provided in the top plate 2. In the present embodiment, the heating coil 14 has a double ring shape including a substantially annular inner heating coil 14a and a substantially annular outer heating coil 14b provided outside thereof.

  Inside the main body 1, a device-side communication unit 21 that communicates with the temperature detection device 30, a device-side control unit 22 that controls the drive unit 23, a drive unit 23 that drives the high-frequency inverter 24, and the heating coil 14 have high frequency. A high frequency inverter 24 for supplying current is disposed. The device-side control unit 22 transmits a high-frequency power command (thermal power information) to the drive unit 23 based on the setting content by the operation display unit 3 and the temperature information from the temperature detection device 30. The device-side control unit 22 is configured by using hardware such as a circuit device that realizes the function, or is configured by an arithmetic device such as a microcomputer or a CPU and software executed thereon. The drive unit 23 adjusts the high-frequency current flowing through the heating coil 14 by controlling the high-frequency inverter 24 based on a command from the device-side control unit 22. Thereby, heating control of the container 10 is performed. In addition, the device-side control unit 22 generates a signal for confirming the state of the temperature detection device 30, and transmits the signal from the device-side communication unit 21 to the temperature detection device 30 via the communication port 8.

  In addition, an infrared temperature sensor 27 is disposed below the top plate 2 of the heating cooker 100. The infrared temperature sensor 27 detects infrared rays emitted from the bottom of the container 10 placed on the top plate 2 on the heating coil 14. Note that it is desirable that the portion directly above the infrared temperature sensor 27 has a structure that does not shield infrared rays (for example, a cavity or a transmission material). A signal detected by the infrared temperature sensor 27 is output to the infrared temperature detection unit 270. The infrared temperature detection unit 270 performs A / D conversion on the detection signal from the infrared temperature sensor 27 and converts it to a temperature. The temperature information converted by the infrared temperature detection unit 270 is output to the device-side control unit 22.

  Further, a contact-type temperature sensor 28 such as a thermistor is arranged on the back surface of the top plate 2 of the heating cooker 100 facing the heating coil 14 so as to contact the back surface of the top plate 2. The contact temperature sensor 28 detects heat transmitted from the container 10 to the top plate 2. The signal detected by the contact temperature sensor 28 is output to the contact temperature detector 280. The contact-type temperature detection unit 280 performs A / D conversion on the detection signal from the contact-type temperature sensor 28 and converts it into a temperature. The temperature information converted by the contact temperature detector 280 is output to the device-side controller 22.

  The device-side communication unit 21 corresponds to the “second communication unit” in the present invention. The device-side control unit 22 corresponds to a “control unit” in the present invention.

  Next, the configuration of the operation display unit 3 of the cooking device 100 will be described. FIG. 3 is a diagram for explaining the operation display unit 3 of the cooking device 100 according to the present embodiment. As shown in FIG. 3, the operation display unit 3 includes a status display unit 3 a that indicates the operating status of each heating port 6, an automatic menu key 3 b for setting an automatic cooking menu, and a thermal power setting for setting thermal power. A key 3c and a timer setting key 3d for setting the heating time are provided.

  The status display unit 3 a has a display corresponding to each heating port 6, and the display mode is switched according to the operating state of each heating port 6. The display of the status display unit 3a can indicate to the user which heating port 6 is operating. The automatic menu key 3b includes a “boiled” key, a “noodle boiled” key, a “boiled water” key, a “baked food” key, a “fried food” key, and a “temperature” setting key. When these keys are pressed, the device-side control unit 22 performs heating control according to a control sequence preset for each menu and stored in a storage unit (not shown).

  The thermal power setting key 3c includes a “weak” fire key, a “medium” fire key, and a “strong” fire key, and the user can set one of three levels of thermal power using these keys. It has become. By providing keys individually according to the thermal power, the user can input the necessary thermal power settings with a single operation. The timer setting key 3d includes a timer setting part and a timer display part. The user sets the heating time by operating the timer setting part, and the set time is displayed on the timer display part. The display changes over time. The device-side control unit 22 performs heating control according to the time set by the timer setting key 3d.

  Although not shown in FIG. 3, for example, a display unit configured by a liquid crystal screen or the like that displays information on the thermal power and progress status such as “preheating” and “appropriate temperature reached”, the contents of the set menu, etc. May be provided separately.

(Configuration of temperature detector)
Next, the structure of the temperature detection apparatus 30 of this Embodiment is demonstrated. FIG. 4 is a perspective view of the temperature detection device 30 of the present embodiment, and FIG. 5 is a plan view of the temperature detection device 30. FIG. 6 is a diagram illustrating the internal configuration of the temperature detection device 30. As shown in FIG. 4 and FIG. 5, the temperature detection device 30 has a planar shape like a pan, and communicates with the placement unit 31 on which the container 10 is placed and the device-side communication unit 21. And a communication unit 33.

  The placement unit 31 is made of silicone rubber or the like having elasticity and heat resistance. In addition, a plurality of dome-shaped protrusions 311 are formed on the surface of the placement portion 31 on which the container 10 is placed. As shown in FIG. 5, the plurality of protrusions 311 are arranged at equal intervals on the circumference of the diameter D. The diameter D of the circle in which the protrusion 311 is arranged is determined from the minimum diameter of the container 10 to be placed. Alternatively, the diameter D is determined based on the position where the highest temperature is generated in the heat generating part at the bottom of the container 10 due to the characteristics of the heating coil 14 when the temperature detection device 30 is disposed inside the heating coil 14. For example, it is provided at a position 40 mm from the center.

  In addition, as shown in FIG. 6, temperature sensors 34 are respectively disposed inside the plurality of protrusions 311. The temperature sensor 34 is a contact-type temperature sensor and detects the temperature of the bottom of the container 10 placed on the placement unit 31. The temperature sensor 34 is configured by, for example, a thermistor or a thermocouple.

  When the container 10 is placed on the placement unit 31, the bottom of the container 10 comes into contact with the protrusion 311. By forming the protrusion 311 with elastic silicone rubber or the like, the bottom of the container 10 and the protrusion 311 are in close contact with each other, and the contact area increases. Further, by providing the temperature sensor 34 in the protrusion 311 that is in close contact with the bottom of the container 10, the temperature sensor 34 comes into contact with the bottom of the container 10, and the temperature of the container 10 can be detected with high accuracy.

  In the present embodiment, four protrusions 311 are formed, and the temperature sensor 34 is arranged in each protrusion 311. However, the present invention is not limited to this. For example, the temperature sensor 34 may be provided in any one of the three protrusions 311, or one or more temperature sensors 34 may be provided in two or less or four or more protrusions 311. However, the container 10 can be stably supported by setting the number of the protrusions 311 to three or more. Also, by providing a plurality of temperature sensors 34, temperature detection can be continued even when a disconnection or the like occurs.

  Moreover, the thickness t of the mounting portion 31 shown in FIG. 6 is less than 5 mm in terms of the maximum thickness including the protruding portion 311. When the thickness t of the placing portion 31 is 5 mm, the container 10 placed on the temperature detection device 30 is separated from the top plate 2 of the heating cooker 100 by about 5 mm. Here, when the container 10 moves away from the heating coil 14, the magnetic flux attenuates in inverse proportion to the square of the distance. Therefore, it is generally considered that the heating efficiency is lowered by separating the container 10 from the heating coil 14. However, actually, when the top plate 2 and the container 10 are in contact, a part of the heat of the container 10 escapes to the top plate 2.

  FIG. 7 is a graph showing the relationship between the distance from the top plate 2 to the bottom of the container 10 and the heating efficiency. In FIG. 7, an insulator is disposed between the top plate 2 and the container 10, and an air layer is formed between the top plate 2 and the container 10. And it is the result obtained from the experiment which changed the distance from the top plate 2 to the container 10 by changing the magnitude | size of an insulator, and measured the heating efficiency of the boiling water in each distance. As shown in FIG. 7, the heating efficiency is higher when the distance from the top plate 2 to the container 10 is about 2 mm than when the distance from the top plate 2 to the container 10 is 0 mm. In the case of a mirror pan or the like having a low emissivity, the efficiency is increased by about 2%. Here, the thermal conductivity K of neo-serum glass generally used for the top plate 2 is 1.6, and the thermal conductivity K of air is 0.0241. Therefore, the heat conduction is reduced and the heating efficiency is improved when the air layer is formed, compared with the case where the container 10 and the top plate 2 are in contact with each other.

  However, as shown in FIG. 7, when the distance from the top plate 2 to the container 10 is 5 mm or more, the heating efficiency is lower than when the distance from the top plate 2 to the container 10 is 0 mm. Therefore, by making the distance from the top plate 2 to the container 10 less than 5 mm, a heating efficiency substantially equal to or higher than the heating efficiency when the gap amount between the top plate 2 and the container 10 is 0 mm is realized. be able to. In addition, although the thermal conductivity K of the silicone rubber used for the mounting part 31 is 0.2, which is higher than the thermal conductivity of air, the container 10 is placed on the protruding part 311 by placing the container 10 thereon. The contact area is limited, and heat conduction is suppressed.

  In addition, the height of the protrusion 311 is set to 1 to 2 mm in consideration of the warp of the bottom of the container 10. Specifically, some pans or frying pans used as the container 10 have the bottom bent upward (convex shape) in advance in consideration of deformation due to heating. For example, assuming that the maximum value of warpage at the center of the bottom of the container 10 is 3 mm, the warpage gradually decreases toward the outside in the radial direction of the container 10, and the position of the diameter 80 mm where the protrusion 311 is disposed ( That is, at a position having a radius of 40 mm from the center, the warp is about 1 to 2 mm. Therefore, by setting the protrusion 311 to be 1 to 2 mm or more, the protrusion 311 can be reliably brought into contact with the bottom of the container 10 even when the bottom of the container 10 is warped in advance.

  Returning to FIGS. 5 and 6, the temperatures detected by the plurality of temperature sensors 34 are output to the communication unit 33. The communication part 33 is arrange | positioned on the outer side of the mounting part 31 by planar view at the time of use so that the container 10 mounted in the mounting part 31 may not be contacted. More specifically, the placement unit 31 has an outer diameter that is slightly larger than the outer diameter of the heating coil 14, and the communication unit 33 and the placement unit 31 in a state where the temperature detection device 30 is disposed on the heating port 6. The outer shell is disposed outside the heating coil 14.

  As illustrated in FIG. 6, the communication unit 33 includes a sensor side communication unit 331, a sensor side control unit 332, and a power supply unit 333. Each of the above parts is housed in a cylindrical housing 330 and sealed in a watertight state. The housing 330 has heat resistance and impact resistance and has a structure that does not shield radio waves. Specifically, the upper surface 330a of the housing 330 is formed of a material (for example, aluminum) having impact resistance and a magnetic shielding effect. The main body 330b is formed of a material that does not shield radio waves, has high heat resistance and high friction coefficient (for example, PPS, PC, silicone rubber, ceramics, etc.), and has a surface coated with silicone rubber. Note that a material that transmits radio waves other than metal may be used for at least a part of the main body 330b. The housing 330 is provided with a power switch (not shown). By operating this power switch, the temperature detection device 30 is turned on.

  The sensor side communication unit 331 performs bidirectional information communication with the device side communication unit 21 arranged in the main body 1 of the heating cooker 100 under the control of the sensor side control unit 332. Information communication between the sensor-side communication unit 331 and the device-side communication unit 21 is performed using, for example, a 2.4 GHz band wireless communication module. By using the wireless module, it is not necessary to provide a connector part outside the temperature detection device 30, and it is possible to reduce a short circuit due to water immersion inside the temperature detection device 30. In addition, since the wiring is not required, it is possible to prevent the wiring from being caught on the handle of the container 10 and the like, for example, the heating port 6 on the back side is easy to use, and the usability is improved. In addition, information can be transmitted to a 2.4 GHz Wi-Fi (IEEE802.11 standard) module provided in the home, and has expandability with external wireless communication devices. The sensor side communication unit 331 corresponds to the “first communication unit” in the present invention.

  In addition, regarding a frequency band, you may use the specific low-power radio station communication module using not only a 2.4 GHz band but the 900 MHz band and the frequency band below 300-500 MHz band. For example, the frequency of the induction current in the induction heating cooker (IH cooking heater) uses a frequency band of 20 to 30 kHz, and the frequency of the electromagnetic wave in the microwave oven uses a frequency band of 2.45 GHz. For this reason, if it is a frequency of 900 MHz or a 300-500 MHz band, communication will be possible, without causing interference with other cooking appliances.

  In addition to the above, information communication may be performed using Bluetooth (registered trademark) or RFID (Radio Frequency Identifier). However, when the RFID is used, the sensor-side communication unit 331 and the device-side communication unit 21 need to be positioned, and thus a display indicating the arrangement position of the communication unit 33 is performed on the upper surface of the top plate 2. The information communication between the sensor side communication unit 331 and the device side communication unit 21 is not limited to wireless communication, and may be wired communication using a cable.

  The sensor side control unit 332 controls each component of the temperature detection device 30. The sensor-side control unit 332 is configured by using hardware such as a circuit device that realizes the function, or is configured by an arithmetic device such as a microcomputer or a CPU and software executed thereon. The sensor side control unit 332 transmits the temperature information detected by the temperature sensor 34 to the device side communication unit 21 via the sensor side communication unit 331. Specifically, the highest temperature among the temperatures detected by the plurality of temperature sensors 34 is transmitted as temperature information. In another embodiment, an average value of temperatures detected by a plurality of temperature sensors 34 may be transmitted as temperature information. In addition, when the sensor-side control unit 332 receives a state confirmation signal from the device-side control unit 22, the sensor-side control unit 332 sends a signal indicating that the power supply is on to the device-side control unit 22 via the sensor-side communication unit 331. Send. The power supply unit 333 is a battery for supplying power to each component unit.

  Next, the temperature sensor 34 and its wiring of the temperature detection device 30 in the present embodiment will be described. As shown in FIGS. 5 and 6, the plurality of temperature sensors 34 according to the present embodiment are connected to the communication unit 33 via lead wires 312 each formed of a copper wire or the like. Here, for example, a thermistor is used as the temperature sensor 34 as described above. The thermistor is an element whose resistance value changes depending on the temperature of the temperature contact portion, and detects the temperature from a voltage value output by a voltage dividing circuit (not shown) provided in the communication portion 33. The temperature sensor 34 is coated with heat-resistant glass or the like in order to prevent connection with the lead wire 312 and deterioration of the thermistor element.

  The temperature sensor 34 and the lead wire 312 are disposed inside the mounting portion 31 formed of silicone rubber, and are mounted on the heating coil 14 of the heating cooker 100. Then, the signal detected by the temperature sensor 34 is A / D converted by the sensor side control unit 332 provided in the communication unit 33, and transmitted from the sensor side communication unit 331 to the device side communication unit 21 of the heating cooker 100. The Here, when the cooking device 100 is driven, a high frequency current of about 20 to 30 kHz is supplied to the heating coil 14, and a magnetic field is generated in a direction interlinking with the current. As a result, an eddy current is generated in the container 10 made of metal or the like disposed immediately above the heating coil 14, and the container 10 is heated by the resistance heat generated by the current.

  At this time, since the temperature detection device 30 is disposed between the bottom surface of the container 10 and the heating coil 14, the temperature detection device 30 is electrically exposed to a high-frequency magnetic field. Moreover, the electric power and frequency input to the heating coil 14 are variably controlled according to an automatic cooking menu or the like. Therefore, electromagnetic noise may be superimposed on the detection result of the temperature sensor 34 in the lead wire 312 in the mounting portion 31 of the temperature detection device 30.

  Therefore, in the present embodiment, the lead wire 312 is arranged so as to extend from the temperature sensor 34 toward the outline of the placement unit 31 in a plan view when in use. Specifically, as shown in FIG. 5, the lead wires 312 are arranged so as to extend radially from the temperature sensor 34 toward the outline of the placement unit 31. As a result, the lead wire 312 is disposed substantially orthogonal to the winding direction R of the heating coil 14 in a state where the mounting portion 31 is mounted on the heating port 6. As a result, the area where the lead wire 312 is affected by the magnetic field is reduced, and the influence of electromagnetic noise is also reduced. Such a reduction in electromagnetic noise is also clarified from experimental results. Since the outer portion of the mounting portion 31 is disposed outside the heating coil 14, the lead wire 312 drawn in the direction orthogonal to the winding direction R of the heating coil 14 is placed on the mounting portion 31. And is connected to the communication unit 33. As shown in FIG. 5, the lead wire 312 is preferably routed so as to be perpendicular to the winding direction R of the heating coil 14, but parallel to the winding direction R of the heating coil 14. It suffices that the heating coil 14 and the lead wire 312 intersect so as not to become.

  Moreover, although not shown in figure, the lead wire 312 may be provided with a film, or may expose a metal part. However, since the mounting portion 31 is formed of silicone rubber, it has flexibility. Therefore, the lead wires 312 may be brought into contact with each other and become conductive when the temperature detection device 30 is used or carried. Therefore, at least one of the lead wires 312 may be covered with a heat-resistant and insulating film such as fluorine or polycarbonate to prevent short-circuiting during deformation.

(Cooking operation)
Next, the heating operation of the heating cooker 100 in the present embodiment will be described. The apparatus side control unit 22 of the heating cooker 100 has an automatic cooking mode in which a target temperature is set. In the automatic cooking mode, the heating control of the heating coil 14 is performed so that the temperature acquired from the temperature detection device 30 becomes the target temperature. The automatic cooking mode is set by the automatic menu key 3b of the operation display unit 3.

  In the automatic cooking mode, when the temperature detection device 30 and the heating cooker 100 are linked to perform heating control, if the temperature detection device 30 is not disposed on the heating port 6 to be heated, the container 10 to be heated The temperature cannot be detected, and incorrect heating control is performed. Therefore, the device-side control unit 22 of the present embodiment performs a sensor determination process for determining whether or not the temperature detection device 30 is disposed on the heating port 6 to be heated before executing the automatic cooking mode. . Specifically, when the temperature change of the temperature detection device 30 is within a predetermined allowable range when a predetermined time has elapsed after the start of heating, the device-side control unit 22 is placed on the heated heating port 6. It determines with the temperature detection apparatus 30 having been arrange | positioned, and performs the heating control by automatic cooking mode. On the other hand, when the temperature change of the temperature detection device 30 is not within the allowable range, the device-side control unit 22 determines that the temperature detection device 30 is not disposed on the heated heating port 6 and performs heating. To stop.

  In the heating control in the automatic cooking mode, the sensor side control unit 332 of the temperature detection device 30 causes the sensor side communication unit 331 to transmit the temperature information detected by the temperature sensor 34, for example, at a cycle of 1 second. The device side communication unit 21 of the main body 1 receives the temperature information from the temperature detection device 30, and the device side control unit 22 acquires the temperature information received by the device side communication unit 21. The device-side control unit 22 controls the high-frequency inverter 24 toward a preset target temperature, and repeats the stop and start of heating so that the temperature information becomes the target temperature.

  As described above, in the present embodiment, the temperature detection device 30 directly detects the temperature of the container 10, thereby improving detection accuracy and detection follow-up. As a result, highly accurate temperature control in the automatic cooking mode is possible, cooking failure due to excessive temperature rise can be suppressed, and cooking suitable for foods can be performed without the user performing a heating power changing operation. Therefore, it is possible to improve convenience, to suppress the temperature rise due to spilling or emptying, and to suppress unnecessary heating.

  Moreover, it is not necessary to provide a temperature sensor and a communication part in the container 10 by using the temperature detection apparatus 30 in which the placing part 31 and the communication part 33 are integrally formed. be able to. Furthermore, by performing the sensor determination process in the device-side control unit 22, it is possible to prevent erroneous heating control when the temperature detection device 30 is not disposed in the heating port 6. In addition, by providing the flat temperature detection device 30 between the container 10 and the top plate 2, the top plate 2 can be prevented from being burnt.

  Furthermore, the lead wire 312 connecting the temperature sensor 34 in the temperature detection device 30 and the sensor side control unit 332 intersects with the winding direction of the heating coil 14 in a plan view during use (for example, with respect to the winding direction). And arranged in a direction orthogonal to each other), the influence of electromagnetic noise can be suppressed and the detection accuracy can be improved. The superposition of electromagnetic noise on the lead wire is suppressed, and stable temperature detection and communication of the container can be performed with high accuracy. As a result, it becomes possible to appropriately control the temperature of the food.

  In addition, in place of or in addition to arranging the lead wire 312 in a direction orthogonal to the winding direction of the heating coil 14 in a plan view during use, the temperature detection timing in the temperature detection device 30 is adjusted. By doing so, you may suppress the influence by electromagnetic noise.

  Specifically, electromagnetic noise is generated by stopping the energization of the heating coil 14 at a predetermined timing and performing temperature detection by the temperature detection device 30 and transmission of the detection result during a period when the energization of the heating coil 14 is stopped. Can alleviate the effects. Alternatively, the heating coil 14 may be driven uniformly with a predetermined power, the influence degree of noise may be constant, the detection result of the temperature detection device 30 may be corrected with the influence degree, and the temperature may be converted. In these cases, the device-side control unit 22 and the sensor-side control unit 332 notify the timing.

Embodiment 2. FIG.
Next, a second embodiment of the present invention will be described. The temperature detection device 30 </ b> A of the present embodiment is different from the first embodiment in that it includes a frame 313 that holds the outline of the placement unit 31. About the other structure of 30 A of temperature detection apparatuses, and the structure of the heating cooker 100, it is the same as that of Embodiment 1, and attaches | subjects the same code | symbol.

  FIG. 8 is a plan view of temperature detection device 30A in the second embodiment. The placement unit 31 of the temperature detection device 30A is made of silicone rubber as in the first embodiment. Here, the silicone rubber is flexible and may be deformed when used or carried, which may cause disconnection or short circuit of the lead wire 312 of the temperature sensor 34. In order to suppress the occurrence of such disconnection or short circuit, the temperature detection device 30 </ b> A of the present embodiment includes a frame 313 on the outer shell of the silicone rubber that forms the placement portion 31.

  The frame 313 is formed using a metal such as aluminum or copper having a low electrical resistance, or ceramics. The frame 313 has an annular cylindrical shape with a part cut away, and the lead wire 312 is disposed in the frame 313 so as to follow the outline of the placement portion 31.

  According to the present embodiment, in addition to the effects of the first embodiment, the deformation of the mounting portion 31 formed of silicone rubber by the frame 313 is suppressed, and the lead wire 312 is fixed in the frame 313. The risk of disconnection can be reduced.

Embodiment 3 FIG.
Next, a third embodiment of the present invention will be described. The temperature detection device 30 </ b> B according to the present embodiment is different from the first embodiment in that a support portion 314 is provided on the lower surface of the placement portion 31. About the other structure of the temperature detection apparatus 30B, and the structure of the heating cooker 100, it is the same as that of Embodiment 1, and attaches | subjects the same code | symbol.

  FIG. 9 is a plan view of the temperature detection device 30B according to Embodiment 3, and FIG. 10 is a schematic side view of the temperature detection device 30B. As shown in FIGS. 9 and 10, a support portion 314 is provided on the bottom surface of the temperature detection device 30 </ b> B of the present embodiment. The support portion 314 is formed of a metal such as aluminum or copper having a low electrical resistance, or ceramics, and four support portions 314 are provided corresponding to the temperature sensors 34 and the lead wires 312. As shown in FIG. 9, the support portion 314 has a fan shape that covers a region including the temperature sensor 34 and the lead wire 312 in a plan view when used.

  In the present embodiment, by providing the support portion 314, in addition to the effects of the first embodiment, the joint portion between the temperature sensor 34 and the lead wire 312, particularly the edge portion of the glass that coats the temperature sensor 34, etc. The possibility of disconnection is the highest, the lead wires 312 are close to each other, and the risk of disconnection or short circuit at a place where the risk of short circuit is high can be reduced.

  The arrangement of the support portion 314 is not limited to the lower surface of the placement portion 31, and may be disposed inside the placement portion 31 or on the upper surface. Further, the shape of the support portion 314 is not limited to a sector shape, and may be any shape that supports the temperature sensor 34 and the lead wire 312.

Embodiment 4 FIG.
Next, a fourth embodiment of the present invention will be described. The temperature detection device 30 </ b> C according to the present embodiment is different from the first embodiment in that a protection unit 315 is provided on the surface of the protrusion 311. About the other structure of 30 C of temperature detection apparatuses, and the structure of the heating cooker 100, it is the same as that of Embodiment 1, and attaches | subjects the same code | symbol.

  FIG. 11 is a schematic cross-sectional view of temperature detection device 30C in the fourth embodiment. The container 10 placed on the placement unit 31 of the temperature detection device 30C is supported by a plurality of protrusions 311. Therefore, the surface of the protrusion 311 is worn due to rubbing with the container 10. Therefore, in temperature detection device 30 </ b> C of the present embodiment, protective portion 315 is formed on the surface of protrusion 311, that is, the surface that contacts container 10.

  The protection part 315 is formed, for example, by depositing or pasting aluminum on the surface of the protrusion 311. Alternatively, the protective portion 315 may be formed by applying glass paint on the surface of the protruding portion 311. The protection unit 315 may be formed on the entire surface of the plurality of projections 311, or formed on the surface of one of the plurality of projections 311 (for example, the projection 311 on which the temperature sensor 34 is disposed). May be. Further, the protection part 315 may be formed so as to cover the entire dome-shaped surface of the protruding part 311, or may be formed only on a part in contact with the container 10. In the present embodiment, the wear strength of the protrusion 311 can be improved by providing the protective portion 315 on the surface of the protrusion 311.

  In addition, if the protection part 315 is formed in the whole upper surface of the mounting part 31, the magnetic flux which generate | occur | produces from the heating coil 14 will be weakened, and heating efficiency will fall. Therefore, the protection part 315 is provided only on the surface of the protrusion 311 that is most worn. Further, as a modification of the present embodiment, the protruding portion 311 is made of a heat-resistant and wear-resistant fluorine rubber, a material (carbon or metal) having higher thermal conductivity than silicone rubber, or a ceramic material such as glass. May be. In this case, it is desirable that the metal used for the protrusion 311 is a nonmagnetic material that is difficult to be induction-heated. Moreover, when using fluororubber, it controls so that temperature may be 250 degrees C or less.

Embodiment 5. FIG.
Next, a fifth embodiment of the present invention will be described. The temperature detection device 30 </ b> D of the present embodiment is different from the first embodiment in that a heat insulating layer is provided below the temperature sensor 34. About the other structure of temperature detection apparatus 30D, and the structure of the heating cooker 100, it is the same as that of Embodiment 1, and attaches | subjects the same code | symbol.

  FIG. 12 is a schematic cross-sectional view of a temperature detection device 30D in the fifth embodiment. When cooking with the heating cooker 100, the container 10 is induction-heated by the magnetic flux generated by the heating coil 14. Therefore, a temperature difference is generated between the bottom surface temperature of the container 10 and the temperature of the top plate 2. In the present embodiment, the temperature detection device 30 </ b> D is interposed between the bottom surface of the container 10 and the top plate 2. Therefore, the temperature of the top plate 2 is lower than the temperature at the bottom of the container 10. Thereby, the temperature detected by the temperature sensor 34 may be affected by the temperature of the top plate 2 as well as the bottom surface temperature of the container 10.

  Therefore, in the temperature detection device 30 </ b> D of the present embodiment, a heat insulating layer is provided below the temperature sensor 34. Specifically, a recessed portion 316 that is recessed in the protruding direction of the protruding portion 311 is formed below the temperature sensor 34 on the lower surface of the mounting portion 31, that is, the surface that contacts the top plate 2. Thereby, in a state where the temperature detection device 30D is placed on the top plate 2, an air layer is formed between the top plate 2 and the temperature sensor 34, and functions as a heat insulating layer. As a result, the influence of the temperature of the top plate 2 is suppressed, and the detection accuracy of the bottom surface temperature of the container 10 by the temperature sensor 34 is improved. The concave portion 316 may have a dome shape similar to the protruding portion 311, or may have another shape as long as it forms an air layer.

  FIG. 13 is a schematic cross-sectional view of a temperature detection device 30E in a modification of the fifth embodiment. In the present modification, a heat insulating layer is formed below the temperature sensor 34 by filling the recess 316 with the heat insulating material 317. As the heat insulating material 317 filled in the concave portion 316, a material (for example, ceramic) having a larger heat capacity than the silicone rubber that is the material of the placement unit 31 is used. Thus, by forming the heat insulation layer by the heat insulating material 317 between the top plate 2 and the temperature sensor 34, the influence of the temperature of the top plate 2 is further suppressed, and the bottom temperature of the container 10 by the temperature sensor 34 is reduced. Detection accuracy is further improved. In the example of FIG. 13, the recess 316 is filled with the heat insulating material 317 and the top plate 2 and the heat insulating layer are in contact with each other. However, the temperature sensor inside the protrusion 311 is formed without forming the recess 316. A heat insulating layer 317 may be formed by arranging a heat insulating material 317 below 34.

  As mentioned above, although embodiment of this invention was described with reference to drawings, the concrete structure of this invention is not restricted to this, In the range which does not deviate from the summary of invention, it can change. For example, the temperature detection device 30 in the above embodiment is configured by the placement unit 31 and the communication unit 33, but may be configured to include a connection unit that connects the placement unit 31 and the communication unit 33. In this case, the communication part 33 can be arrange | positioned in arbitrary positions by adjusting the length of a connection part. Moreover, the shape of the mounting portion 31 is not limited to a circle, and may be various shapes such as an ellipse, a rectangle, and a polygonal diameter.

  Moreover, the structure in the said Embodiment 1-5 can be combined suitably. For example, the temperature detection device 30B according to the third embodiment may include the frame 313 according to the second embodiment. Moreover, it is good also as a structure provided with both the protection part 315 of the projection part 311 in Embodiment 4, and the heat insulation layer in Embodiment 5. FIG.

  In addition, the arrangement of the plurality of protrusions 311 is not limited to the above embodiment, and is an arrangement suitable for detecting the bottom surface temperature of the container 10. For example, the plurality of protrusions 311 may be arranged according to the outer diameter of the heating coil 14. FIG. 14 is a diagram illustrating an example of the arrangement of the protrusions 311 in the temperature detection device 30F of the present modification. FIG. 14 is a plan view of a state in which the temperature detection device 30F is placed on the heating coil 14. The inner heating coil 14a disposed below the temperature detection device 30F is indicated by a one-dot chain line, and the outer heating coil 14b is indicated. The two-dot chain line and the contact-type temperature sensor 28 are indicated by broken lines, respectively.

  Many of the heating coils 14 used in the heating cooker 100 are provided with a substantially annular inner heating coil 14a and a substantially annular outer heating coil 14b provided outside the heating coil 14 as in the above embodiment. It is a polycyclic shape. In some cases, heating is performed by switching energization between the inner heating coil 14a and the outer heating coil 14b. Therefore, even when heated only by the inner heating coil 14a, the protrusion 311 on which the temperature sensor 34 is arranged is located on the inner side of the inner heating coil 14a or on the inner heating coil of the heating coil 14 so that the temperature can be detected. It is desirable to arrange between 14a and the outer heating coil 14b.

  Specifically, when the temperature detection device 30 </ b> F is placed on the heating coil 14, the protruding portion 311 is disposed in a region from the center of the heating coil 14 to about 2/3 of the outer diameter of the heating coil 14. It is set as the protrusion arrangement region D2 (FIG. 14). Further, the outer diameter of the mounting portion 31 of the temperature detection device 30F is slightly larger than the outer diameter of the heating coil 14. Therefore, in other words, the protruding portion arrangement region D2 is a region from the center of the placement portion 31 to approximately 2/3 of the outer diameter of the placement portion 31. By arranging the protrusion 311 in this way, temperature detection can be performed even when the small-diameter container 10 is used.

  Further, the contact temperature sensor 28 of the heating cooker 100 is disposed between the inner heating coil 14a and the outer heating coil 14b of the heating coil 14 or inside the inner heating coil 14a. And you may perform the calculation which complements the temperature influence part of the top plate 2 using the contact-type temperature sensor 28. FIG. As a result, even when the temperature detected by the temperature sensor 34 is affected by the temperature of the top plate 2, more accurate temperature detection is possible by calculating the values of the contact temperature sensor 28 and the temperature sensor 34. .

  1 Main body, 2 Top plate, 3 Operation display section, 3a Status display section, 3b Automatic menu key, 3c Thermal power setting key, 3d Timer setting key, 4 Front operation display section, 4a Power switch, 5 Thermal power display section, 6 Heating port 7 exhaust port 8 communication port 9 grill 10 container 14 heating coil 14a inner heating coil 14b outer heating coil 21 device side communication unit 22 device side control unit 23 drive unit 24 high frequency inverter 27 Infrared temperature sensor, 28 Contact temperature sensor, 30, 30A, 30B, 30C, 30D, 30E, 30F Temperature detection device, 31 Placement unit, 33 Communication unit, 34 Temperature sensor, 100 Heat cooker, 270 Infrared temperature detection unit 280 Contact-type temperature detection unit, 311 protrusion, 312 lead wire, 313 frame, 314 Support section, 315 protection section, 316 recess, 317 heat insulating material, 330 housing, 330a upper surface, 330b main body, 331 sensor side communication section, 332 sensor side control section, 333 power supply section.

Claims (18)

A flat plate-like placement section on which a container in which an object to be heated is placed is placed;
A plurality of protrusions protruding upward from the placement portion and contacting the container;
A plurality of temperature sensors respectively disposed in the plurality of protrusions and detecting the temperature of the container;
A heat insulating layer disposed below the plurality of temperature sensors;
A first communication unit connected to the mounting unit and transmitting temperatures detected by the plurality of temperature sensors;
A plurality of lead wires respectively connecting the plurality of temperature sensors to the first communication unit ;
Wherein the plurality of lead wires, the temperature sensing device according to claim Rukoto disposed so as to extend radially toward the outer periphery of the mounting section from the plurality of temperature sensors. The temperature detector according to claim 1 , wherein the outer shell of the mounting portion is formed of silicone rubber. It further comprises a frame for holding the outer shell of the mounting portion,
Wherein the frame, the temperature sensing device according to claim 1 or 2, characterized in that it is formed of metal or ceramics. The frame has a cylindrical shape with a part cut away;
The temperature detection device according to claim 3 , wherein the plurality of lead wires are arranged in the frame in an outline of the mounting portion . A support portion for supporting the plurality of temperature sensors and the plurality of lead wires;
It said support portion, the temperature sensing device according to any one of claims 1 to 4, characterized in that it is formed of metal or ceramics. 6. The temperature detection device according to claim 1 , wherein at least a part of the plurality of temperature sensors or the plurality of lead wires are covered with a heat-resistant film. Wherein the plurality of temperature sensors, the temperature sensing device according to any one of claim 1 to 6, characterized in that a thermistor or thermocouple. The temperature detecting device according to any one of claims 1 to 7 , wherein a recessed portion that is recessed in a protruding direction of the protruding portion is provided below the plurality of temperature sensors. The temperature detection device according to claim 8 , wherein the heat insulating layer is an air layer formed by the concave portion. The heat insulating layer is formed by a material having a large heat capacity than the material of the mounting section,
A material having a large heat capacity than the material of the placement section, the temperature sensing device of claim 8, wherein Rukoto filled in the recess. Temperature sensing device according to any one of claim 1 to 10, characterized in that the protective portion is provided on a surface of the plurality of protrusions. The mounting portion is formed using a heat-resistant resin material,
The temperature detection device according to claim 11 , wherein the protection unit is formed by depositing or pasting aluminum. The plurality of protrusions are formed of a resin having heat resistance and wear resistance, or a material having a higher thermal conductivity than the mounting portion, according to any one of claims 1 to 12. The temperature detection device described. Wherein the plurality of protrusions, according to any one of claim 1 to 13, characterized in that arranged in the region of the center of the placement section to 2/3 of the outer diameter of the mounting section Temperature sensing device. A flat plate-like placement section on which a container in which an object to be heated is placed is placed;
A protrusion protruding upward from the placement portion and contacting the container;
A temperature sensor disposed in the protrusion and detecting the temperature of the container;
A heat insulating layer disposed below the temperature sensor;
A first communication unit connected to the mounting unit and transmitting a temperature detected by the temperature sensor;
A lead wire connecting the temperature sensor and the first communication unit;
A frame for holding the outer shell of the mounting portion,
The frame is formed of metal or ceramics and has a cylindrical shape with a part cut away,
The temperature detection device according to claim 1, wherein the lead wire is disposed so as to extend from the temperature sensor toward an outline of the placement portion, and is disposed in the frame at the outline of the placement portion. The temperature detection device according to any one of claims 1 to 15,
A top plate on which the container and the temperature detection device are placed;
A heating unit for heating the container;
A second communication unit that receives temperature information transmitted from the temperature detection device;
A control unit for controlling the heating unit based on the temperature information received by the second communication unit;
A heating cooker comprising: A top plate on which a container in which an object to be heated is stored is placed;
A heating unit for heating the container;
A temperature detection device disposed between the container and the top plate, the temperature detection device having a temperature sensor that detects the temperature of the container and a first communication unit that transmits the temperature detected by the temperature sensor When,
A second communication unit that receives temperature information transmitted from the temperature detection device;
A control unit for controlling the heating unit based on the temperature information received by the second communication unit;
With
The temperature detection device detects and transmits the temperature of the container during a period in which energization to the heating unit is stopped or during a period in which the heating unit is constantly driven with a predetermined power. Cooking cooker.   The cooking device according to claim 16 or 17, wherein the heating unit is a heating coil for induction heating the container.

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