JP2007120829A5 - - Google Patents

Description

High frequency heating device

  The present invention relates to a high-frequency heating device that uses an infrared sensor to detect the surface temperature of an object to be heated in a non-contact manner and controls a high-frequency generator.

  Conventionally, this type of high-frequency heating device detects the surface temperature of the object to be heated in a wide range by scanning the surface temperature of the object to be heated by reciprocating the infrared sensor around a single rotation axis. The high frequency generator is controlled by information (for example, refer to Patent Document 1).

FIG. 5 shows a conventional high-frequency heating device described in Patent Document 1. In FIG. As shown in FIG. 5, the infrared sensor 3 for detecting the surface temperature of the article 2 to be heated placed in the heating chamber 1 in a non-contact manner, and the infrared sensor 3 are reciprocally swung around one rotation axis. The infrared sensor swing means 4 that scans and detects the surface temperature of the object to be heated 2, and a control device 6 that controls the high-frequency generator 5 based on the surface temperature of the object to be heated 2.
JP-A-6-265152

  However, in the conventional configuration, since a stepping motor or the like is used as the sensor swing means, a slight positional deviation occurs between the forward and backward paths of the reciprocating swing due to the play of gears inside the stepping motor, and the object to be heated. The detected value of the surface temperature differs between the forward path and the backward path, and has a problem of affecting the control of the high frequency generator.

  The present invention solves the above-mentioned conventional problems, using a stepping motor or the like as a sensor swing means, and by a play of gears inside the stepping motor, etc., a slight positional deviation occurs between the forward path and the return path of the reciprocating swing, An object of the present invention is to provide a high-frequency heating device that does not affect the control of the high-frequency control device even if the detected value of the surface temperature of the object to be heated is different between the forward pass and the return pass.

In order to solve the above-described conventional problems, the high-frequency heating device of the present invention is configured such that when the surface temperature of the object to be heated in the forward path obtained by reciprocating swing by the infrared sensor swing means satisfies a predetermined condition, The high frequency generator is controlled based on the surface temperature of the object .

  Thereby, even if the detected value of the surface temperature of the object to be heated is different between the forward path and the return path, the control of the high frequency generator is not affected.

  The high-frequency heating device of the present invention uses a stepping motor or the like as the sensor swing means, and a slight positional deviation occurs between the forward and backward paths of the reciprocating swing due to the play of gears inside the stepping motor, and the surface temperature of the object to be heated. Even if the detected value differs between the forward path and the backward path, it does not affect the control of the high-frequency control device.

The first invention includes a heating chamber for accommodating an object to be heated, a microwave generator for radiating high frequency waves into said heating chamber, an infrared sensor for detecting the surface temperature of the object to be heated without contact, the infrared sensor an infrared sensor swing means is reciprocally swings around a rotation axis for scanning detects the surface temperature of the object to be heated, and the high-frequency generator based on the surface temperature of the heated object detected by the infrared sensor And when the surface temperature of the object to be heated in the forward path obtained by reciprocating swing by the infrared sensor swing means satisfies a predetermined condition, the control apparatus controls the object to be heated in the return path. The high frequency generating means is controlled based on the surface temperature .

As a result , even if a slight positional deviation occurs between the forward path and the backward path of the reciprocating swing, and the detected value of the surface temperature of the object to be heated is different between the forward path and the backward path, the information obtained in the forward path and the information obtained in the backward path are separated. Since it is used separately , it does not affect the control of the high-frequency control device.

When the surface temperature obtained at a predetermined swing position in the forward path of the reciprocating swing and the surface temperature obtained later at the predetermined swing position in the forward path satisfy a predetermined condition in the first invention By controlling the high-frequency generator based on the surface temperature obtained later at the predetermined swing position on the return path, a subtle position shift occurs on the forward and return paths of the reciprocating swing, and the surface temperature of the object to be heated Even if the detected value differs between the forward path and the return path, the information obtained on the forward path and the information acquired on the return path are used separately, so that the control of the high-frequency control device is not affected.

  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. 4 shows a configuration diagram of the high-frequency heating device according to the first embodiment of the present invention.

  In FIG. 4, a heating chamber 1 that accommodates an object to be heated 2, a high-frequency generator 5 that radiates high-frequency radio waves to the heating chamber 1, an infrared sensor 3 that detects the surface temperature of the object to be heated 2 in a non-contact manner, and an infrared ray Infrared sensor swing means 4 that scans and detects the surface temperature of the object to be heated 2 by reciprocatingly swinging the sensor 3 around one rotation axis, and control for controlling the high-frequency generator 5 based on the surface temperature of the object to be heated 2 The apparatus 7 is configured.

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

  First, when the high-frequency heating device starts cooking, the control device 7 starts driving the high-frequency generator 5, and high-frequency radio waves are radiated into the heating chamber 1. At the same time, the infrared sensor 3 starts detecting the surface temperature of the object to be heated 2 in a non-contact manner. The infrared sensor swing means 4 also starts to operate and reciprocates to detect the surface temperature of the article 2 to be heated. And the control apparatus 7 stops the high frequency generator 5 by the information of the detected surface temperature, and complete | finishes cooking. FIG. 3 illustrates an example of the surface temperature of the object to be heated 2 when there is no play in the gear in the stepping motor used for the infrared sensor swing means 4 and an ideal reciprocating swing operation is performed. . In this embodiment, the infrared sensor swing means 4 scans in 10 steps for each reciprocation. For example, if the stop condition of the control device 7 is a condition in which the detected temperature of each swing and the previous swing is compared and the temperature rises by 0 K or more and is 70 ° C. or more, each detected temperature in the return path 11 Since the temperature has risen by 0 K or more compared to the detected temperature, the control device 7 stops the high frequency generator 5 at 70 ° C. of the swing step 6 in the return path 11 and finishes cooking.

Next, there is play in the gear inside the stepping motor used for the infrared sensor swing means 4, and a slight positional deviation occurs between the forward and backward paths of the reciprocating swing, and the detected value of the surface temperature of the object to be heated 2 is also A reference example of the surface temperature of the object to be heated 2 when it is different between the forward path and the return path will be described with reference to FIG. Since the 65 ° C. of the swing step 6 in the forward path 11 is 49 ° C. in the swing step 6 of the return path 11 and the temperature rise is decreasing, the control device 7 described above can be used even if the swing step 5 in the forward path 11 reaches 70 ° C. Therefore, the controller 7 does not stop the high-frequency generator 5, does not end cooking, and cooking is over. The positional deviation caused by the play of the gear inside the stepping motor causes a positional deviation between the forward path and the backward path, but does not occur between each forward path and each backward path. Therefore, if the control device 7 is controlled by distinguishing the information of the forward path and the return path, the problem is eliminated. When the stop condition of the control device 7 is the forward path, the temperature rises by 0 K or more compared with the detected temperature of the swing of the previous forward path. In the return path, the temperature rises by 0 K or more compared with the detected temperature of the swing of the previous return path However, under the condition of 70 ° C. or more, even in the case of FIG. 1 this time, since the comparison is made between the swing steps of the return path 11 and the return path 10, the detected temperature is increased by 0 K or more. At 70 ° C. of the swing step 5, the control device 7 stops the high frequency generator 5 and finishes cooking.

  Further, the problem can be solved by averaging the information of the forward path and the information of the backward path for one round trip without distinguishing the forward path and the return path. FIG. 2 shows an average value of the forward and backward paths for one round trip in FIG. 1 at each swing step. In this case, since the detected temperature may be lowered because averaging is performed, if the condition of 70 ° C. or higher of the stop condition of the control device 7 is set to 65 ° C. or higher, the average swing step 5 of the forward path 11 and the return path 11 At 65 ° C. or higher, the controller 7 stops the high frequency generator 5 and finishes cooking. In the description of FIG. 1, the control device 7 is controlled by distinguishing the information of the forward route and the return route, but the same applies even if the control device 7 is controlled using the information only of the forward route or the information of the backward route. Effects can be obtained.

  As described above, in the present embodiment, high-frequency generation is performed by distinguishing or averaging forward path information and return path information of the surface temperature of the object to be heated obtained by reciprocating swing by the infrared sensor swing means. By controlling the apparatus, the control of the high-frequency generator is not affected even if the detected value of the surface temperature of the object to be heated is different between the forward path and the return path.

  As described above, the high-frequency heating device according to the present invention can be applied even if the detected value of the surface temperature of the object to be heated is different between the forward path and the return path due to causes other than the stepping motor, and therefore, an infrared sensor is used. Widely applicable to high-frequency heating devices.

The figure which shows the detection temperature of the infrared sensor in Embodiment 1 of this invention The figure which shows the average detection temperature of the infrared sensor in Embodiment 1 of this invention The figure which shows the ideal detection temperature of the infrared sensor in Embodiment 1 of this invention. Configuration diagram of a high-frequency heating device in Embodiment 1 of the present invention Configuration diagram of a conventional high-frequency heating device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heating chamber 2 Object to be heated 3 Infrared sensor 4 Infrared sensor swing means 5 High frequency generator 7 Controller

Claims (2)

A heating chamber for accommodating an object to be heated, a microwave generator for radiating high frequency waves into said heating chamber, said infrared sensor for non-contact detection of surface temperature of the heated object, the one rotating shaft said infrared sensor an infrared sensor swing means in back and forth swing around detecting scan the surface temperature of the heated object, and a control unit for controlling the high-frequency generator based on the surface temperature of the heated object detected by the infrared sensor The control device, when the surface temperature of the heated object in the forward path obtained by reciprocating swing by the infrared sensor swing means satisfies a predetermined condition, based on the surface temperature of the heated object in the return path A high- frequency heating apparatus characterized by controlling high-frequency generating means . The control device, when the surface temperature obtained at a predetermined swing position in the forward path of the reciprocating swing and the surface temperature obtained later at the predetermined swing position in the forward path satisfy a predetermined condition, The high-frequency heating device according to claim 1, wherein the high-frequency generator is controlled based on the surface temperature obtained later at a swing position .