JP3680942B2 - Heating device using electromagnetic induction heating - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heating apparatus using electromagnetic induction heating, and more particularly to a heating apparatus using electromagnetic induction heating that can be suitably used to accurately heat an iron pan having an annular rib on the bottom surface to an appropriate temperature. It is.
[0002]
[Prior art]
The applicants have developed an original product called “Beef Pepper Rice” (registered trademark) and are developing a franchise chain of restaurants.
This “Beef Pepper Rice” is served on an iron plate that has been heated to an appropriate temperature and has excellent heat retention. Rice and sliced raw beef are served on the plate. It is a dish that is mixed with rice and baked to the desired level and cooked with rice.
[0003]
The important thing in this dish is to heat an iron dish on which raw beef is placed to the optimum temperature.
That is, in the case of baking raw meat, if the surface is not baked at a high temperature exceeding 250 ° C., the umami of the meat will appear and the taste will be poor. On the other hand, when the iron pan is at a high temperature exceeding 300 ° C., various materials placed on the iron pan are burnt, which is not preferable.
Therefore, the heating temperature of the iron pan is set to an appropriate temperature of 290 to 300 ° C.
[0004]
Currently, the iron pan is heated by controlling the heating time using a commercial electromagnetic cooker.
In other words, an iron pan is placed on the plate of the electromagnetic cooker, a heating coil disposed under the plate is energized to generate a high frequency magnetic field, an eddy current is generated inside the iron pan, and the iron pan is self Heating by heating is performed to a suitable temperature by performing heating for a predetermined time (specifically, about 1 minute and 10 seconds) set by a timer.
[0005]
[Problems to be solved by the invention]
However, in the heating method of the iron pan by the time control using the electromagnetic cooker mentioned above, it has arisen that the temperature of the iron pan after a heating differs greatly by the difference in the initial temperature of an iron pan.
That is, for example, in winter and summer, there is a difference of about 30 ° C. in the initial temperature of the iron pan. In addition, the initial temperature of the iron tray varies not only depending on the region and weather. Furthermore, when the iron pan is washed using a dishwasher, the iron pan immediately after that is at a high temperature exceeding 60 ° C. When these induction plates with different initial temperatures are subjected to electromagnetic induction heating for the same time using an electromagnetic cooker, the temperature of the heated iron plate will naturally differ, and the heated iron plate will be heated to an appropriate temperature. There were cases where it was impossible to obtain.
This leads to the inability to provide customers with uniform food in quality, and is a major issue in developing a franchise chain that emphasizes the ability to provide the same delicious taste regardless of where you eat. It was.
[0006]
The present invention has been made in view of the problems of the above-described prior art, and the object thereof is to heat a heated object that is very important to be heated to an optimum temperature regardless of the difference in the initial temperature. An object of the present invention is to provide a heating apparatus capable of heating accurately and efficiently to an optimum temperature.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention detects a plate on which a heated object is placed, a heating coil that generates a high-frequency magnetic field disposed in a lower portion of the plate, and a temperature of the heated object. A temperature sensor, a heating temperature setting means for setting a heating temperature of the object to be heated, and a control means for stopping the output of the heating coil when the temperature detected by the temperature sensor reaches the heating temperature by the heating temperature setting means; The temperature sensor is an infrared sensor that receives infrared rays emitted from the heated object and detects the temperature of the heated object from the received infrared rays. In addition, the light receiving portion of the infrared sensor is disposed above the heated body that does not interfere with the operator via the arm, and is caused by oil smoke or the like in the light receiving portion in the vicinity of the light receiving portion. Air nozzle is arranged to prevent les, and the light receiving unit, and a heating apparatus using an electromagnetic induction heating target lights indicating the direction toward the light receiving portion is disposed.
[0008]
According to the heating device using electromagnetic induction heating according to the present invention described above, a temperature sensor for detecting the temperature of the heated object, a heating temperature setting means for setting the heating temperature of the heated object, and detection by the temperature sensor Control means for stopping the output of the heating coil when the temperature reaches the heating temperature by the heating temperature setting means, so that the object to be heated was set by the heating temperature setting means regardless of the difference in the initial temperature. It is possible to heat accurately and efficiently up to the temperature.
In the present invention, the temperature sensor is an infrared sensor that receives infrared rays emitted from a heated body and detects the temperature of the heated body from the received infrared rays. It is disposed above the heated body that does not interfere with the operator. This is because when a contact-type temperature sensor such as a thermocouple or thermistor is provided on the lower surface of the plate on which the object to be heated is placed, the temperature of the object to be heated is indirectly detected via the plate. It is difficult to accurately measure the temperature of the object to be heated, and if the object to be heated has an annular rib on the bottom surface, or if the heating rate of the object to be heated is high, the actual temperature of the object to be heated It becomes even more difficult to measure temperature. Further, when a contact-type temperature sensor is disposed on the upper surface of the plate or a contact-type temperature sensor is disposed in a state of protruding from the upper surface of the plate, it becomes an obstacle when the heated object is raised or lowered on the plate. At the same time, the fear of damaging the temperature sensor is not preferable. Furthermore, if the contact-type temperature sensor is configured to directly contact the object to be heated and manually detect the temperature, the operation of bringing the temperature sensor into contact with the object to be heated, or the contact of the temperature sensor with the object to be heated is performed. Work to confirm is essential, which is also not preferable from the viewpoint of workability. Therefore, the temperature sensor is an infrared sensor that receives the infrared rays emitted from the heated body and detects the temperature of the heated body from the received infrared rays, and the light receiving portion of the infrared sensor is connected to the operator via the arm. By disposing above the heated object that does not get in the way, the temperature of the heated object can be accurately measured in a non-contact state, and the temperature sensor becomes an obstacle when raising and lowering the heated object on the plate There is no danger of damaging the temperature sensor.
In the present invention, an air nozzle for preventing the light receiving portion from being contaminated by oily smoke is disposed in the vicinity of the light receiving portion of the infrared sensor.
This is because the infrared sensor receives the infrared rays emitted from the heated object and detects the temperature thereof, so that dirt on the light receiving part prevents the infrared rays from being received and makes accurate temperature measurement impossible. By arranging an air nozzle near the light receiving portion of the infrared sensor and preventing the light receiving portion from being soiled by blowing air from the air nozzle, accurate temperature measurement can be realized over a long period of time.
Furthermore, in the present invention, a target light indicating the direction in which the light receiving unit faces is disposed in the light receiving unit of the infrared sensor.
This is because the infrared light received by the infrared sensor is invisible light, so whether or not the light receiving part of the infrared sensor truly receives the infrared light emitted from the heated object, in other words, the infrared sensor Providing a target light that can check whether the light receiving unit is correctly oriented in the direction of the object to be heated allows the light receiving unit of the infrared sensor to always be directed in the direction of the object to be heated. realizable.
[0009]
Here, in the present invention, when the temperature detected by the temperature sensor reaches the heating temperature set by the heating temperature setting means, the control means stops the output of the heating coil and notifies the end of heating of the object to be heated. It is preferable to control to emit sound and / or light.
This means that even if the operator is doing other work, the end of heating of the heated object can be detected by sound or light, and the heated object heated to the optimum temperature can be transferred to the next process without cooling. It is preferable because it is possible.
[0013]
Further, as the infrared sensor, a light-receiving unit and a control unit are separated, and a fiber-type infrared sensor is connected between them by an optical fiber. Only the light-receiving unit is disposed above the heated body and the control is performed. It is preferable that the portion is disposed inside the main body.
This is because only the light receiving part is arranged above the heated object, so that it is easy to secure the installation space, and the control part which dislikes heat, dirt, impact, etc., that is, the received infrared energy is converted into electrical energy. Since the central portion of the infrared sensor that converts and converts the electrical energy into temperature is disposed inside the main body, it is preferable because a highly reliable device that can be used for a long time can be provided.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a heating apparatus using electromagnetic induction heating according to the present invention will be described below in detail with reference to the drawings.
[0015]
FIG. 1 is a sectional view conceptually showing an embodiment of a heating device using electromagnetic induction heating according to the present invention. This heating device 1 has a crystal glass plate or a ceramic plate on the upper surface of a main body 2. The plate 3 comprised by these is provided. A heating coil 4 that generates a high-frequency magnetic field of, for example, about 40 KHz is disposed below the plate 3, and the output of the heating coil 4 is controlled by a control means 5 provided at the bottom of the main body 2. .
[0016]
The control means 5 stores a program for performing heating by controlling an inverter circuit (not shown) that supplies a high-frequency current to the heating coil 4 by an operation of a start key (not shown) by an operator. In addition, information on the detected temperature Ta by the temperature sensor 6 that detects the temperature of the heated object A placed on the plate 3 and the heating temperature setting means 7 provided on the front surface of the main body 2 are set. Information on the heating temperature Tb is transmitted, and the output of the heating coil 4 is stopped when the detected temperature Ta by the temperature sensor 6 reaches the heating temperature Tb by the heating temperature setting means 7 based on the information. At the same time, control is performed to supply power to the buzzer 8 that informs the end of heating for a predetermined time.
[0017]
The temperature sensor 6 detects the temperature of the object A to be heated with high accuracy without disturbing the operator, and the light receiving unit 10 is arranged on an arm 9 that is erected on the main body 2 and has a height of about 1 m, for example. A so-called fiber-type infrared sensor is used, in which a control unit 11 is disposed in the main body 2 and the light receiving unit 10 and the control unit 11 are connected by an optical fiber 12. The temperature of the heated object A is detected in a non-contact state from above.
[0018]
As shown in FIGS. 2 and 3, an air nozzle 13 for preventing the light receiving unit 10 from being contaminated with oily smoke is disposed in the vicinity of the light receiving unit 10 of the infrared sensor 6. The air nozzle 13 may have a structure in which air is directly blown toward the light receiving unit 10 to prevent dirt from adhering to the light receiving unit 10. However, the air nozzle 13 illustrated in FIGS. An air nozzle 13 that forms a so-called air curtain K that closes the opening 14 formed in the arm 9 that supports 10 is disposed to prevent oil smoke or the like from entering the arm 9 itself. Yes.
[0019]
The light receiving unit 10 of the infrared sensor 6 is provided with a target light 15 indicating the direction in which the light receiving unit 10 faces. This target light 15 emits visible light P having a strong directivity, and as shown in FIG. 1, it is always determined whether or not the light receiving unit 10 of the infrared sensor 6 is correctly oriented in the direction of the heated object A. It can be confirmed.
[0020]
Next, the operation of the heating device 1 according to the present invention will be described with reference to FIG.
FIG. 4 shows a control program possessed by the control means 5. In step 21, the operation of the start key by the operator is detected to recognize that the heating has started.
[0021]
When the control means 5 detects the operation of the start key, the control means 5 moves to step 22 and controls the inverter circuit to start the input of the specified output to the heating coil 4. As a result, the heating coil 4 generates a high-frequency magnetic field, generates an eddy current in the heated object A placed on the plate 3, and heats the heated object A by self-heating.
[0022]
Then, the control means 5 moves to step 23 and recognizes information of the detected temperature Ta by the temperature sensor 6. Next, in step 24, the detected temperature Ta is compared with a heating temperature (for example, 300 ° C.) Tb preset by the operator using the heating temperature setting means 7.
[0023]
As a result, if the detected temperature Ta does not reach the heating temperature Tb, that is, it is determined as “NO”, the process returns to step 23 again, and the temperature measurement of the heated object A by the temperature sensor 6 is continued.
On the other hand, when the detected temperature Ta has reached the heating temperature Tb, that is, when it is determined “YES”, the output step 25 of “stop heating” is performed, and the output of the heating coil 4 is stopped by controlling the inverter circuit. Further, the process proceeds to step 26, where power is supplied to the buzzer 8 for informing the end of heating for a predetermined time, and then the process proceeds to the end (end) step 27.
[0024]
Thus, the heating apparatus 1 using electromagnetic induction heating according to the present invention includes a temperature sensor 6 that detects the temperature of the heated object A, a heating temperature setting means 7 that sets the heating temperature of the heated object A, And a control means 5 for stopping the output of the heating coil 4 when the temperature Ta detected by the temperature sensor 6 reaches the heating temperature Tb by the heating temperature setting means 7. Regardless of the difference, the heating temperature can be accurately and efficiently heated to the optimum temperature (for example, 300 ° C.) set by the heating temperature setting means 7.
[0025]
FIG. 5 is a perspective view showing an example of the actual apparatus of the heating apparatus using electromagnetic induction heating according to the present invention described above, and this actual apparatus includes two heating apparatuses 1 and 1. In addition, the same code | symbol was attached | subjected about the same member as the above. Reference numeral 16 not described above is an operation panel for turning on / off the power, switching electric power, etc., 17 is an exhaust hole plate, 18 is a display panel for the heating temperature setting means 7, heating temperature and detection temperature. .
[0026]
FIG. 6 shows the result of temperature measurement by the temperature sensor 6 when the heating temperature is set to 300 ° C. by the heating temperature setting means 7 and the steel pan weighing about 3.5 kg is heated by the actual machine shown in FIG. A graph is shown.
From this graph, the temperature sensor 6 measures the temperature of the iron pan, which is the object to be heated A, in real time, and accurately and efficiently heats the iron pan to 300 ° C. set by the heating temperature setting means 7. I understand that.
[0027]
The embodiment of the heating device using electromagnetic induction heating according to the present invention has been described above. However, the present invention is not limited to the embodiment described above, and the technical idea of the present invention, that is, Regardless of the difference in the initial temperature, in order to heat the heated object accurately and efficiently to the optimum temperature, the temperature of the heated object in the heating process is detected by a sensor, and the detected temperature is detected by the heating temperature setting means. Various modifications and changes can be made within the scope of the technical idea of a heating device using electromagnetic induction heating that performs control to stop heating of the heated object when the set heating temperature is reached.
In addition, of course, it is also possible to add the accessory detection function, the airing prevention function, the overtemperature prevention function, etc. that have been put into practical use in a conventionally known electromagnetic cooker to the heating apparatus using electromagnetic induction heating according to the present invention. Is possible.
[0028]
【The invention's effect】
As described above, according to the heating apparatus using electromagnetic induction heating according to the present invention described above, the object to be heated, which is very important to be heated to the optimum temperature, can be accurately adjusted to the optimum temperature regardless of the difference in the initial temperature. There exists an effect which can be heated efficiently and efficiently.
[Brief description of the drawings]
FIG. 1 is a sectional view conceptually showing an embodiment of a heating apparatus using electromagnetic induction heating according to the present invention.
FIG. 2 is a cross-sectional view showing an example of a temperature sensor installation portion of a heating apparatus using electromagnetic induction heating according to the present invention.
3 is a perspective view showing a state of an air curtain formed by the air nozzle shown in FIG. 2. FIG.
FIG. 4 is a flowchart showing an example of control contents of a heating apparatus using electromagnetic induction heating according to the present invention.
FIG. 5 is a perspective view showing an example of a real device of a heating device using electromagnetic induction heating according to the present invention.
6 is a graph showing a heating state of the iron pan by the actual machine shown in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Heating apparatus 2 Main body 3 Plate 4 Heating coil 5 Control means 6 Temperature sensor (infrared sensor)
7 Heating temperature setting means 8 Buzzer 9 Arm 10 Light receiving part 11 of temperature sensor (infrared sensor) Control part 12 of temperature sensor (infrared sensor) Optical fiber 13 Air nozzle 14 Opening 15 Target light A Object to be heated (iron plate)
Ta Temperature detected by temperature sensor Tb Heating temperature by heating temperature setting means K Air curtain P Visible light

Claims (3)

A plate on which the object to be heated is placed; a heating coil that generates a high-frequency magnetic field disposed in a lower part of the plate; a temperature sensor that detects the temperature of the object to be heated; and a heating temperature of the object to be heated. A heating apparatus using electromagnetic induction heating, comprising heating temperature setting means for setting and control means for stopping the output of the heating coil when the temperature detected by the temperature sensor reaches the heating temperature by the heating temperature setting means. The temperature sensor receives an infrared ray emitted from the heated object, and detects the temperature of the heated object from the received infrared ray, and the light receiving unit of the infrared sensor detects the arm. Is disposed above the heated body that does not interfere with the operator, and an air nozzle is disposed in the vicinity of the light receiving portion to prevent contamination of the light receiving portion due to oil smoke, One, the light receiving unit, characterized in that the target light pointing to the direction facing the light receiving portion is disposed, a heating device using electromagnetic induction heating.   Control in which the control means stops the output of the heating coil when the temperature detected by the temperature sensor reaches the heating temperature by the heating temperature setting means, and emits a sound and / or light notifying the end of heating of the object to be heated. The heating apparatus using electromagnetic induction heating according to claim 1, wherein: The infrared sensor is a fiber-type infrared sensor in which a light receiving unit and a control unit are separated and connected between them by an optical fiber, the light receiving unit is disposed above the heated body, and the control unit is a main body. The heating apparatus using electromagnetic induction heating according to claim 1, wherein the heating apparatus is disposed inside .

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