JP2014070875A - High frequency heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To acquire a device capable of preventing lack of heating of a heating object in a low temperature environment by using a temperature detection thermistor for temperature adjustment control in a chamber in heating and cooking foods by high frequency heating.SOLUTION: A high frequency heating device includes: a heating chamber 10; a thermistor 31 for a heating chamber for detecting a temperature in the heating chamber; and control means 26 for controlling a magnetron 19 based on these temperature detection signals. The control means 26 sets a heating condition which is optimum both in a high temperature environment and in a low temperature environment when a temperature detection result by the thermistor 31 for a heating chamber detects a preset predetermined value at the time of high frequency heating.

Description

  The present invention relates to control of a high-frequency heating device having a function of heating food.

  Conventionally, this type of cooking device (for example, a microwave oven) includes a heating chamber for storing an object to be heated, a thermistor for a heating chamber for detecting the temperature in the heating chamber, a high-frequency generator for heating the object to be heated, A control means for controlling the heating pattern and heating time for heating the object to be heated is provided, and when a predetermined value set in advance is detected, the detection signal is received to set subsequent heating conditions (for example, patents) Reference 1).

  Moreover, the said conventional internal temperature sensor is used for the purpose of the temperature control during cooking, and needs to be highly sensitive at high temperature.

  In addition, the above-mentioned conventional internal temperature sensor is also used for the purpose of preventing overheating when continuous cooking is performed, and the method for setting the heating condition after detecting the internal temperature is generally as follows. The linear equation is calculated as follows.

T (cooking time) = TC-SL (detection value) x α (correction value)
Here, YC and α are constants determined from experiments and experiences.

  In addition, the above-described conventional internal temperature sensor has high sensitivity on the high temperature side but low sensitivity on the low temperature side, and the correction value α by the internal temperature sensor is one value.

JP 2008-175497 A

  However, the following problems arise in the conventional method for controlling a high-frequency heating device.

  As for toasting, such as toast, which is colored in a short time, if the initial temperature in the heating chamber is in a high state, the color is too colored. On the other hand, if the initial temperature in the heating chamber is low, the baked color is thin and the finish is damp.

  In the case of insufficient heating such as the baked color is light or the food temperature is low after completion of cooking in automatic cooking, the user has to manually perform additional heating himself.

  This invention solves the said conventional subject, and it aims at providing the high frequency heating apparatus which can perform the optimal heating according to the initial temperature in a heating chamber warehouse.

In order to solve the above-described conventional problems, a high-frequency heating device according to the present invention includes a heating chamber that houses an object to be heated, a high-frequency generator that heats the object to be heated, and a chamber that detects the temperature in the heating chamber. An internal temperature detection unit (heating chamber thermistor) and a heated object mounting tray are provided, and control means is provided for controlling the high-frequency generator based on a detection signal from the internal temperature detection unit (heating chamber thermistor). When the temperature detection result of the internal temperature detection unit (thermistor for heating chamber) detects a predetermined value set in advance, the control means receives the detection signal and sets subsequent heating conditions. Thus, optimal heating is performed.

  As a result, optimal heating control can be performed on the object to be heated, and a stable cooking result can be obtained.

  The high-frequency heating device of the present invention can obtain stable cooking results by determining the internal temperature, distinguishing between high and low temperature environments, and controlling optimum heating conditions for the object to be heated.

1 is an overall configuration diagram of a high-frequency heating device according to Embodiment 1 of the present invention. Flowchart after detecting the internal temperature of the high-frequency heating device according to Embodiment 1 of the present invention.

  1st invention is the heating chamber which accommodates to-be-heated material, the high frequency generator which heats the said to-be-heated material, the chamber internal temperature detection part which detects the temperature in a heating chamber warehouse, and a to-be-heated material mounting tray Comprising control means for controlling the high-frequency generator based on a detection signal of the internal temperature detection unit, and when the temperature detection result of the internal temperature detection unit detects a predetermined value set in advance, In response to the detection signal, the subsequent heating conditions are set.

  Thereby, the optimal heating according to the initial temperature in the heating chamber can be controlled from the experimental data.

  In particular, the second invention is characterized in that, in the first invention, when a predetermined value of the internal temperature detector is detected, different heating control can be set for low temperature and high temperature.

  By this, without changing the specifications of the temperature control thermistor during cooking that has been used in the past, it is possible to control to the optimum heating conditions according to the detected initial temperature in the heating chamber and to prevent overheating and insufficient heating. .

  The third aspect of the invention is particularly characterized in that the control means of the first aspect of the invention receives the detection signal and corrects the heating time. Thereby, it can control to the optimal heating time according to the detected temperature of the to-be-heated material mounting tray.

  The fourth aspect of the invention is particularly characterized in that the control means of the first aspect of the invention receives the detection signal and corrects the radio wave output. Thereby, it is possible to control each heating output to be optimum. Further, by using the inverter power source, finer heating output control and lower output heating are possible, and a stable cooking result can be obtained.

  According to a fifth aspect of the present invention, in particular, the heated object mounting tray according to the first aspect of the present invention is provided with a heating layer made of a microwave heating element that generates heat by absorbing microwave energy, and burns the heated object. It is characterized by being able to. As a result, the bottom surface of the object to be heated can be colored, and fine heating control can be performed by the high frequency generator, so that more detailed heating output control can be performed according to the detected temperature of the object mounting tray. Is possible.

  The sixth invention is particularly characterized in that a heater heating means is provided in the heating chamber of any one of the first to fifth inventions. As a result, it is possible to give a baking color to the upper surface of the object to be heated and to add a baking color to both surfaces without the trouble of turning the object to be heated.

  The seventh invention is particularly characterized in that the automatic toast menu according to any one of the first to sixth inventions is mounted. Thereby, in the toast cooking in which the baking color is easily influenced by the initial temperature of the dish to be heated and the baking color is important, it is possible to prevent over-baking and to prevent insufficient heating.

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

(Embodiment 1)
FIG. 1 is an overall configuration diagram of a high-frequency heating device according to a first embodiment of the present invention.

  In FIG. 1, the heated object placing tray 27 is placed in the heating chamber 10. A high-frequency generator 19 that generates high-frequency electromagnetic waves is configured to supply power via a waveguide 20. An antenna 22 (radio wave radiating means) is provided at the power feeding port from the waveguide 20 to the heating chamber 10 so that high frequency electromagnetic waves from the high frequency generator 19 are diffused and uniformly supplied to the entire heating chamber. .

  Further, the high frequency generator 19 changes the radiation level, that is, the output by the driving power source 36 connected to the control means 26.

  The operation unit (not shown) includes a “toast” key and a “warm” key for automatic heating control, a “heating time input unit” for performing heating based on the user's intention, and a “heating temperature input unit” ”Equipped with a display that displays the temperature of the object to be heated and the remaining cooking time, a“ start ”key for inputting the start of heating, and a“ cancel ”key used to clear the input conditions and interrupt heating Yes.

  For the heating pattern such as the heating output of each stage used in the present embodiment, values set by experiments are stored in the control means 26 in advance.

  The control means 26 is composed of a microcomputer and its peripheral circuits. A program for executing the internal temperature detection processing flow in the cooking flow shown in FIG. 2 to be described later is built in, and the voltage obtained from the heating chamber thermistor 31 that controls the operation of the drive motor 23 and is the internal temperature detection unit. The A / D conversion is performed, the A / D converted temperature data, a predetermined value, the heating time are determined, and the energization time of the heater 29 is determined.

  About the high frequency heating apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, the user places the object to be heated on the object-to-be-heated object placing tray 27, stores and places them in the heating chamber 10, and then selects a key for automatic heating control on the operation unit. Next, the automatic cooking is started by pressing the “start” key.

  After the start of cooking, the control means 26 first starts taking in the detection signal in the heating chamber by the temperature detection means for detecting the temperature. When the temperature detection result detects a predetermined value set in advance and receives the detection signal to determine the initial temperature in the heating chamber, the subsequent heating conditions are set, and the control means 26 A signal is sent to the drive power supply 36 which is a drive power supply, and dielectric heating is started.

Here, the function of the heating chamber thermistor 31 for detecting the internal temperature of the heating chamber 10 will be described. This usually functions as an internal temperature sensor at the time of cooking by heating the heater, depending on the oven and grill menu. The internal temperature is detected so as to obtain the set predetermined temperature, and the heater is heated and controlled based on the detection result.

  Although it is acquisition of the internal temperature of the heating chamber 10, it is not actually temperature, but A / D conversion is performed on the change in voltage that changes depending on the temperature, and it is determined by a number calculated by a predetermined linear expression. Is used.

  Next, the setting of the heating conditions after temperature detection will be described.

  The heating chamber thermistor detects the temperature in the heating chamber and determines the initial temperature in the heating chamber. The detected signal is input to the control means 26, the heating time is corrected, and heating control is performed. In this case, the heating time T is calculated simultaneously with the temperature detection in the heating chamber.

T (cooking time) = TC-SL (detection value) x α (correction value)
Here, TC and α are constants determined from experiments and experiences, and SL is a value detected by the thermistor for the heating chamber.

  At this time, there are two types of α, and when SL is a predetermined value X or more, the high temperature is the Japanese-Western correction value α1, and when SL is less than the predetermined value X, the low temperature side correction value α2 is used. Here, X is a constant determined from experiment and experience. This is shown in FIG. FIG. 2 is a flowchart after detecting the internal temperature of the high-frequency heating device according to the first embodiment of the present invention.

  The heating control may be correction of the heating output. For example, when the inside of the heating chamber is determined to be 0 to 10 ° C., cooking is performed at 800 W output, and when it is determined to be 10 to 20 ° C., cooking is performed at 600 W output. The predetermined value is set based on experience obtained through experiments. The driving power source 36 is an inverter power source and can be heated at a low output.

  Next, it describes about a to-be-heated material mounting tray. A metal heated object mounting tray 27 used when heating an object to be heated is composed mainly of a dish body 27a having a mounting surface formed in a concavo-convex shape and a ferrite provided on the bottom surface thereof. A heating element 27b that is a body, a guide 27c formed of a heat-resistant resin provided around the longitudinal side of the dish body 27a, and slit holes that are a plurality of substantially rectangular openings provided around the dish body 27a (see FIG. Not shown).

  The heated object placing tray 27 is attached by the guide 27c being locked to the rail portion 28 which is a locking means provided on the left and right wall surfaces 11 and 12 of the heating chamber 10. Thereby, the clearance gap of a predetermined dimension is always obtained between the plate main body 27a and the wall surfaces 13 and 14. FIG. Further, the rail portion 28 is provided with rails having different heights in order to adjust the installation position of the heated object placing tray 27.

  A heater 29 is provided in the heating chamber 10 above. By combining the upper heater, both sides can be heated, and both the front and back sides can be scorched, eliminating the need to turn over halfway.

  The high-frequency heating and the heater heating may be performed separately, or may be repeated simultaneously and separately.

  In addition, by installing an automatic toast menu, it is possible to prevent over-burning and to prevent insufficient heating in toast cooking in which the baking color is easily influenced by the initial temperature in the heating chamber, and the baking color is likely to be important. . For example, insufficient heating when the inside of the heating chamber is colder than room temperature 20 ° C., such as early morning in a cold district, can be solved.

  As described above, the high-frequency heating device according to the present invention can be set for the heating conditions according to the initial temperature in the heating chamber, and thus is effective for various uses of cooking devices.

10 Heating chamber 19 Magnetron (high frequency generator)
22 Radiating antenna (radio wave radiation means)
26 Control Unit 27 Heated Object Placement Plate 27b Heating Element 31 Heating Room Thermistor (Internal Temperature Detector)
36 Power supply for driving

Claims (7)

A heating chamber for storing an object to be heated; a high-frequency generator for heating the object to be heated; an in-chamber temperature detecting unit for detecting the temperature in the heating chamber; Control means for controlling the high-frequency generator based on a detection signal of an internal temperature detection unit, and when the temperature detection result of the internal temperature detection unit detects a predetermined value set in advance, A cooking apparatus characterized by receiving a detection signal and setting subsequent heating conditions. The cooking device according to claim 1, wherein when a predetermined value of the internal temperature detection unit is detected, different heating control conditions can be set depending on whether the temperature is low or high. 2. The high frequency heating apparatus according to claim 1, wherein the control means receives the detection signal and corrects the heating time. 2. The high frequency heating apparatus equipped with an inverter power supply according to claim 1, wherein the control means receives the detection signal and corrects the radio wave output. The high frequency wave according to claim 1, wherein the object to be heated is provided with a heating layer composed of a microwave heating element that absorbs microwave energy and generates heat, and the object to be heated can be scorched. Heating device. The high-frequency heating device according to any one of claims 1 to 5, wherein a heater heating means is provided in the heating chamber. The high-frequency heating device according to any one of claims 1 to 6, wherein an automatic toast menu is mounted.