JP2007026738A - High frequency heating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable that a suitable heating can be carried out on foods with different loads by a simple, inexpensive, and safe constitution. <P>SOLUTION: In an aperture 11 that connects a heating room 4 and a wave guide tube 9, a micro-wave agitation means 14 is arranged which consists of plate-formed first and second stirrers 12, 13, having apertures 12a, 12b, 13a, 13b at the center part and the peripheral part relatively rotatably and which is superposed to the micro-wave supply direction, while at the first stirrer 12 and the second stirrer 13, a first pair of coupling pins 15a, 16a are installed that are engageable at a relative angular position where only the apertures 12a, 13a of mutual center parts are superposed, and a second pair of coupling pins 15b, 16b are installed that are engageable at a relative angular position where both apertures 12a, 13a, 12b, 13b of mutual center parts and the peripheral part are superposed. By controlling the driving means 17 by the control part 18 according to the load amount distinguished by a load determining means 3, an opening amount of the micro-wave stirring means 14 is variably controlled. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a high-frequency heating apparatus capable of performing heating according to a load (food).

  2. Description of the Related Art Conventionally, a high-frequency heating apparatus that identifies food having different shapes based on, for example, input from an operation panel and performs heating according to the identified food is known. For example, a cross-shaped radiating antenna is provided below the heating chamber, and a ring-shaped outer antenna is provided on the same plane, and the radiating antenna blades and the outer antenna rib extending toward the radiating antenna are provided with the shortest distance. Created by rotating each driving means relative to the state of 3-5mm coupled in a microwave (for large loads) and the state of uncoupled 10mm or more (for small loads) or radiation There is one in which only the antenna is rotated, or both are stopped during the microwave oscillation, and heating according to the magnitude of the load is performed (for example, see Patent Document 1).

JP 2004-340513 (Page 20, FIG. 17)

  However, such a high-frequency heating device has a problem in that each motor is required to drive the radiation antenna and the outer antenna, which is costly and heavy.

  In addition, there is a gap of 3 to 5 mm at the minimum between the radiating antenna and the outer antenna, and a potential difference is generated during the microwave oscillation, and a spark is generated.

  In addition, when only the radiating antenna is rotated, the gap between the radiating antenna and the outer antenna repeatedly fluctuates. Eventually, the heating chamber standing wave pattern (hereinafter referred to as a small load mode) corresponding to a small load and the heating corresponding to a large load. Two modes of the indoor standing wave pattern (hereinafter referred to as a large load mode) were repeated, and the optimum heating state corresponding to the load could not be maintained.

  Furthermore, if both the radiation antenna and the outer antenna are rotationally restrained during microwave oscillation, the heating unevenness becomes very large, and not only satisfactory performance is obtained, but also the electric field concentrates on a part of the equipment, Since the concentrated part does not move as it is, a part of the equipment becomes hot and melts and the like, and there is a possibility that breakdown and smoke generation may occur.

  The technical problem of the present invention is to enable heating suitable for foods with different loads with an inexpensive, simple and safe configuration.

  A high-frequency heating device according to the present invention includes a heating chamber for heating food, microwave oscillation means for oscillating microwaves, a waveguide for supplying microwaves oscillated from the microwave oscillation means to the heating chamber, and heating A micro comprising plate-like first and second stirrers, which are disposed in an opening connecting the chamber and the waveguide so as to be able to rotate relative to each other in the microwave supply direction and have openings in the center and the outer periphery, respectively. A first stirring pin pair provided on the first stirrer and the second stirrer, and capable of engaging at a relative angular position where only the openings of the center portions overlap with each other; and the first stirrer And a second stirrer provided on the second stirrer and engageable at a relative angular position where the openings of both the central part and the outer peripheral part overlap each other, and a driving means for driving the microwave stirring means And the amount of load that determines the magnitude of the load And another unit, by controlling the driving means according to the load amount is determined by the load amount determining means, in which and a control unit for variably controlling the amount of opening of the microwave stirring means.

  According to the high-frequency heating device of the present invention, the microwave agitating means is disposed so as to be rotatable relative to the opening connecting the heating chamber and the waveguide in the microwave supply direction, and is disposed at the central portion and the outer peripheral portion. Each of the first and second stirrers having a plate shape each having an opening, and the first stirrer and the second stirrer can be engaged with each other at a relative angular position where only the opening at the center of the first stirrer and the second stirrer overlap each other. A pair of connecting pins and a second pair of connecting pins that can be engaged at a relative angular position where the openings of the center and the outer periphery of each other overlap each other. By driving only one of them, the microwave stirring means can be switched between the small load mode and the large load mode. For this reason, a single drive means such as a motor for driving the microwave agitation means is sufficient, so that costs can be reduced and efficient heating can be performed according to the size of the load. Furthermore, since the first and second stirrers can be rotated together while maintaining the state of the small load mode or the large load mode, electric field concentration on a part of the device can be prevented, and a part of the device can be melted or broken. Etc. can be avoided, and safety is improved.

Embodiment 1 FIG.
The present invention will be described below with reference to illustrated embodiments.
1 to 11 all show a high-frequency heating device according to Embodiment 1 of the present invention, FIG. 1 is a schematic configuration diagram of the whole, FIG. 2 is a front view showing an example of an operation panel, FIG. 4 is an explanatory view of the opening patterns of the first and second stirrers constituting the microwave stirring means, FIG. 5 is a cross-sectional view along the axes of the first and second stirrers, and FIG. 6 is a small load mode. FIG. 7 is an explanatory diagram of the microwave irradiation mode in the large load mode, FIG. 8 is a flowchart showing the operation, and FIG. 9 is a modified example of the support portion of the second stirrer. FIG. 10 is a cross-sectional view taken along the axes of the first and second stirrers, FIG. 10 is a cross-sectional view taken along the axes of the first and second stirrers, showing another modification of the support portion of the second stirrer, and FIG. It is a perspective view which shows the sliding member provided in the support part of the 2nd stirrer of FIG. 1, 6, and 7 indicate signal lines.

  The high-frequency heating device of the present embodiment is provided with an operation panel 3 for inputting various types of information on the front (front) upper side portion of a housing composed of a main body 1 and a door 2 that opens and closes the front opening. In the example of the operation panel 3A in FIG. 2A, this operation panel is provided with a key such as “rice” or “food” in addition to the start key, and food such as “rice” or “food”. These are the display keys, and other foods are heated with the start key. In other words, “rice” and “nothing” are relatively small items such as teacups and cups, and “warm start” is used for relatively large lunch boxes and medium-sized side dishes. A mark having a diameter of about 10 cm is generally printed at the center of the bottom surface 5 of the heating chamber 4 in the main body 1, and the food 6 is instructed to be placed on this portion. This is due to the fact that the detection accuracy of the infrared sensor 7 for detecting the cooking temperature is generally adjusted so as to be most excellent at the bottom center portion. Therefore, both large food (load) and small food (load) are to be placed in the central portion of the bottom surface 5.

  In the example of the operation panel 3B in FIG. 2B of the present embodiment, the key is divided into “warm” and “warm food”, and the user uses the “key” and “things”. Even in the case of a small food (load) other than the above, the apparatus can determine that the food is a small food (load), so that the accuracy is further improved. That is, the operation panel functions as a load amount determination unit for determining the magnitude of the load.

  In the main body 1, a magnetron 8 that is a microwave oscillating means, a waveguide 9 that supplies microwaves oscillated from the magnetron 8 into the heating chamber 4, and an opening that connects the heating chamber 4 and the waveguide 9. 11, the plate-like first and second stirrers 12 and 13 are arranged so as to be rotatable relative to each other in the microwave supply direction, and have openings 12a, 12b, 13a and 13b in the center and the outer periphery, respectively. The microwave stirring means 14 is provided on the upper surface of the first stirrer 12 and the lower surface of the second stirrer 13 and can be engaged at a relative angular position where only the central openings 12a and 13a overlap each other. The pair of connecting pins 15a and 16a, and the first connecting pin on the upper surface of the first stirrer 12 and the lower surface of the second stirrer 13 are provided at different positions so that the center portion and the outer peripheral portion of each other Both openings 12 , 13a, 12b, 13b, a second pair of connecting pins 15b, 16b that can be engaged at a relative angular position, a driving means for driving the microwave stirring means 14, that is, a single motor 17, and a load amount determination. A controller 18 is provided for controlling the motor 17 in accordance with the load amount based on the key input of the means, that is, the operation panel 3 to variably control the opening amount of the microwave stirring means 14.

  More specifically, the microwave stirring means 14 is disposed horizontally, and is installed in a state where the second stirrer 13 is placed on the tip tapered portion of the shaft 19 of the first stirrer 12. The first connecting pin 16a or the second connecting pin 16b of the second stirrer 13 is pushed by the first connecting pin 15a or the second connecting pin 15b of the twelve first connecting pin 15a or the second connecting pin 15b. 12 and 13 rotate together. Then, at the relative angular position where the second pair of connecting pins 15b and 16b are engaged (the position where the openings of the two stirrers all overlap), the outer periphery of the stirrer where the two sheets overlap is shown in FIG. The pattern of the opening 12b in the outer peripheral portion of the first stirrer 12 appears in the opening 13b in the outer peripheral portion of the second stirrer 13 as shown in FIG. 3 and the central portion is opened except for the portions of the ribs 12c and 13c. It has become so.

  The shaft 19 of the first stirrer 12 extends from the motor 17 and penetrates the waveguide 9 and the opening 11 as shown in FIG. Therefore, the material of the shaft 19 is made of a dielectric material such as ceramic that absorbs little heat or generates heat. On the other hand, the first stirrer 12 fixed to the shaft 19 is made of metal, and the second stirrer 13 is also made of metal. If the first stirrer 12 and the second stirrer 13 are not electrically connected, a potential difference may occur between the respective stirrers during the microwave oscillation, which may cause a spark. There is also a risk of doing. Therefore, as shown in FIG. 5, the metal shaft 19b is fitted to the ceramic shaft 19a, and the first stirrer 12 and the second stirrer 13 are set to the same potential, so that the occurrence of a spark and the possibility of a failure associated therewith are generated. Can be eliminated. The ceramic shaft 19a and the metal shaft 19b may be coupled by screwing, and the electrical connection between the first stirrer 12 and the second stirrer 13 is made of metal on the ceramic shaft. You may carry out by winding foil, and the same effect can be acquired also in such a case. This electrical connection can be applied to other embodiments described later.

  Next, the operation of the high-frequency heating device of this embodiment will be described based on FIG. 8 with reference to FIGS. First, when the door 2 is opened and closed, the food 6 is placed on the bottom surface 5 of the heating chamber 4 in the main body 1, and information about food (load) is input from the operation panel 3, a key input is made at the control unit 18. It is determined whether or not the load is small from the type of food (step S111), and if the food is a food (small load) such as “rice” or “things”, the rotation direction of the first stirrer 12 is determined to be clockwise. Then, the motor 17 is driven, and the first stirrer 12 is rotated clockwise relative to the second stirrer 13 (step S112). At this time, since the second stirrer 13 is not restrained and is in a free state, it basically remains stationary, and only the first stirrer 12 rotates relatively. When the first stirrer 12 rotates by a predetermined relative angle with respect to the second stirrer 13, the first connecting pin pair 15 a, 16 a is engaged, and the central portions of the first and second stirrers 12, 13 are engaged. However, only the openings 12a and 13a at the center of the first stirrer 12 continue to rotate, although only the openings 12a and 13a are overlapped (FIGS. 3 (f) and 4 (f)). The first connection pin 16a of the second stirrer 13 is pushed by the first connection pin 15a of the first stirrer 12 while the overlapping form is maintained, and the first and second stirrers 12 and 13 rotate together. To do.

  Next, a magnetron 8 is applied to oscillate microwaves, and the microwaves are irradiated into the heating chamber 4 from the waveguide 9 only through the openings 12a and 13a at the center of the microwave stirring means 14, as shown in FIG. Then, heating (cooking) of the food 6 is started (step S113).

  When cooking is started, the control unit 18 determines whether the load, that is, the temperature of the food 6 has reached a set value T (for example, 80 ° C.) based on the temperature information from the infrared sensor 7 (step S114). When the temperature of 6 reaches the set value T (80 ° C.), the magnetron 8 is stopped (step S115), the motor 17 is stopped (step S116), and cooking is finished.

  If it is determined that the load is not a small load from the type of food keyed in step S111, the rotation direction of the first stirrer 12 is determined to be counterclockwise, the motor 17 is driven, and the first stirrer 12 is moved. Rotate counterclockwise relative to the second stirrer 13 (step S117), and proceed to step S113. Thereby, the pair 15b, 16b of the second connecting pin is engaged, and the openings 12a, 13a, 12b, 13b of both the central part and the outer peripheral part of the first and second stirrers 12, 13 are overlapped ( 3 (c) and FIG. 4 (c)), the rotation of the first stirrer 12 is continued, so that the openings 12a, 13a, 12b, and 13b in both the central portion and the outer peripheral portion overlap each other. Is held, the second connecting pin 15b of the second stirrer 13 is pushed by the second connecting pin 15b of the first stirrer 12, and the first and second stirrers 12 and 13 rotate together. In step S113, the magnetron 8 is applied to oscillate microwaves, and the microwaves pass through the openings 12a, 13a, 12b, and 13b in both the central portion and the outer peripheral portion of the microwave stirring means 14 from the waveguide 9 as shown in FIG. In this manner, the heating chamber 4 is irradiated and heating (cooking) of the large food 6 is started. In step S114, it is determined whether the temperature of the food 6 has reached a set value T (for example, 80 ° C.). If the temperature of the food 6 has reached the set value T (for example, 80 ° C.), the magnetron is determined in step S115. 8 is stopped, the motor 17 is stopped in step S116, and cooking is terminated.

  Thus, according to the high-frequency heating device of this embodiment, when the load is small, the first stirrer 12 is rotated to the right to close the opening of the outer peripheral portion of the microwave stirring means 14 and only the center portion is opened. By doing so, direct irradiation from the outer peripheral opening is prevented, and accordingly, the energy density of the microwave directly irradiated from the central opening is increased, and thereby, at the center of the bottom surface 5 of the heating chamber 4 as shown in FIG. Since the microwave irradiation is concentrated on the small food 6 placed, the small food 6 can be warmed efficiently. Further, when the load is large, the first stirrer 12 is rotated counterclockwise to open both the central portion and the outer peripheral portion of the microwave stirring means 14 so that the direct irradiation is also performed from the outer peripheral portion opening, as shown in FIG. Since the microwave is irradiated to the whole large food as described above, the large food 6 can be efficiently heated.

  The first and second stirrers 12 and 13 are configured to be relatively rotatable, and the first connecting pin pair 15a is engaged at a relative angular position where only the central openings 12a and 13a overlap. , 16a and the second pair of connecting pins 15b, 16b that engage at the relative angular positions where the openings 12a, 13a, 12b, 13b of both the central portion and the outer peripheral portion overlap each other. It is possible to cause the microwave agitating means 14 to take a form according to the load amount, and to rotate the first and second stirrers 12 and 13 together while maintaining the form according to the load amount. For this reason, not only can cost reduction and weight reduction be achieved, but also heating efficiency can be improved and electric field concentration on a part of the equipment can be prevented, so that melting or failure of a part of the equipment can be avoided, and safety can be avoided. Can be improved.

  By the way, here, as an example, the widths of the four ribs 13c of the opening 13a in the central portion of the second stirrer 13 are set to the same width and at equal intervals (every 90 degrees). In this case, under the condition that the first and second stirrers 12 and 13 co-rotate with the opening only in the center portion (FIG. 3 (f)), the microwave stirring means 14 is oscillating during the clockwise rotation. The mode (distribution pattern) of the standing wave appearing in the heating chamber 4 becomes the same mode (same distribution pattern) every ¼ period. Therefore, the width of one of the four ribs 13c in the central opening of the second stirrer 13 is increased. Thereby, the mode (distribution pattern) of the standing wave appearing in the heating chamber 4 during the microwave oscillation when the microwave agitating means 14 rotates clockwise can be improved from the 1/4 cycle to the 1 cycle. And the failure due to the concentration of standing waves can be further suppressed.

  In addition, here, the microwave stirring means 14 has been described as an example in which the microwave stirring means 14 is rotated leftward in the case of a heavy load and rightward in the case of a small load, but the rotation direction according to the load is limited to this. In addition, the reverse pattern can be easily created by changing the arrangement of the connecting pins and the opening design, and the opening patterns of the first stirrer 12 and the second stirrer 13 are also as shown in FIGS. Needless to say, the present invention is not limited to such an opening pattern, and various opening patterns can be adopted.

  Further, here, in order to secure the free state of the second stirrer 13, a description has been given of an example in which the second stirrer 13 is simply placed on the shaft 19 of the first stirrer 12. Thus, a metal sliding member, for example, a radial ball bearing 20 may be interposed between the shaft 19 and the first stirrer 12. That is, one end of the outer ring 21 of the radial ball bearing 20 is fixed to the center portion of the lower surface of the second stirrer 13, and the inner ring 22 is pushed by its own weight into the tip tapered portion of the metal shaft 19 b of the first stirrer 12. To do. Thereby, the rotation of the shaft 19 and the rotation of the second stirrer 13 can be more stably separated, and a desired stirrer opening can be obtained reliably. Further, by using the radial ball bearing 20 in this way, the inner ring 22 can have the aligning action of the second stirrer 13, and the second stirrer 13 is detached from the shaft 19. Can be prevented. The sliding member including the radial ball bearing 20 can be applied to other embodiments described later.

  Further, as shown in FIGS. 10 and 11, a sliding member may be provided between the second stirrer 13 and the heating chamber 4. That is, the auxiliary shaft 31 is provided at the center of the upper surface of the second stirrer 13 and is fitted into the ring-shaped shaft restraint 32 made of a dielectric material such as ceramic adhered to the back surface of the floor surface 5 of the heating chamber 4. To do. Thereby, it is possible to prevent a potential difference from occurring between the floor surface 5 and the second stirrer 13 and to prevent the second stirrer 13 from being detached from the shaft 19. The sliding member composed of the auxiliary shaft 31 and the ring-shaped shaft restraint 32 can be applied to other embodiments described later.

  In addition, here, the load (food) has been described as an example of determining the magnitude of the load (food) with the button of the operation panel 3, but the present invention is not limited to this. For example, a weight sensor is provided on the floor surface, The mechanism of inferring the size of the food from the weight change of the food body may be used, the size of the food may be determined by photographing with a camera, or the size of the temperature rising area detected by the infrared sensor 7 may be determined. May be.

Embodiment 2. FIG.
FIG. 12 is a flowchart showing the operation of the high-frequency heating device according to Embodiment 2 of the present invention. Since the hardware configuration of the second embodiment is the same as that of the first embodiment, the description will be made with reference to FIGS. 1 to 11 described above.

  When the high-frequency heating device is installed on an inclined surface instead of a horizontal surface, the shaft 19 and the second stirrer 13 have a contact area larger than expected, no slip occurs between them, and the relationship with the connecting pin It is conceivable that the second stirrer 13 rotates together with the first stirrer 12 in the same direction from the beginning of driving. And in such a case, it becomes impossible to make the opening of the microwave stirring means 14 into the opening pattern according to the load amount.

  The high-frequency heating device of the present embodiment can surely cause slippage between the shaft 19 and the second stirrer 13 at the beginning of driving, so that the opening of the microwave agitating means 14 can have an opening pattern corresponding to the load amount. It is characterized in that The operation will be described below with reference to FIGS. 1 to 11 of the first embodiment based on FIG. First, when the door 2 is opened and closed, the food 6 is placed on the bottom surface 5 of the heating chamber 4 in the main body 1, and information about food (load) is input from the operation panel 3, a key input is made at the control unit 18. It is determined from the type of food whether the load is small (step S211). If the type of food that has been keyed in is a food item (small load) such as “rice” or “food”, the rotation direction of the first stirrer 12 is finally the same as in the first embodiment. As shown in FIG. 3 (f) and FIG. 4 (f), only the central openings 12a and 13a of the first and second stirrers 12 and 13 are superposed on each other. Then, the motor 17 is driven in the direction opposite to the rotation direction according to the load amount, that is, the left rotation direction opposite to the right rotation direction according to the small load, and the first stirrer 12 is rotated to the left ( Step S212). Next, when a predetermined time (for example, 0.5 seconds) elapses (step S213), the motor 17 is reversely rotated in the rotation direction according to the load amount, that is, the right rotation direction according to the small load, and the first stirrer 12 is moved to the second direction. Rotate clockwise relative to the stirrer 13 (step S214).

  That is, at the beginning of driving, the first stirrer 12 is rotated in the direction opposite to the target direction (left rotation direction), and the second stirrer 13 may rotate together with the first stirrer 12 at this stage. However, after 0.5 second, that is, while the second stirrer 13 is rotating with the inertial force in the co-rotating direction (left rotation direction), the first stirrer 12 is reversed in the target direction (right rotation direction), Slip is reliably generated between the shaft 19 and the second stirrer 13, the first stirrer 12 is rotated relative to the second stirrer 13, and the first connecting pin pair 15a, 16a is engaged. . Thereby, the opening of the microwave stirring means 14 can be made into the opening pattern (pattern which opens only a center part) according to the load amount (small load) reliably. Then, since the rotation of the first stirrer 12 is continued in this state, the first connecting pin 15a of the first stirrer 12 maintains the form in which only the openings 12a and 13a at the center thereof are overlapped. The first connecting pin 16a of the second stirrer 13 is pushed and the first and second stirrers 12 and 13 rotate together.

  Next, although cooking is started, the operations from the start of cooking to the end of cooking (steps S215 to S218) are the same as the operations of steps S113 to S116 in FIG. 8 described above. That is, a magnetron 8 is applied to oscillate microwaves, and the microwaves are irradiated into the heating chamber 4 from the waveguide 9 only through the openings 12a and 13a at the center of the microwave stirring means 14, as shown in FIG. The heating (cooking) of the food 6 is started (step S215).

  When cooking is started, the control unit 18 determines whether or not the load, that is, the temperature of the food 6 has reached a set value T (for example, 80 ° C.) based on the temperature information from the infrared sensor 7 (step S216). When the temperature of 6 reaches the set value T (80 ° C.), the magnetron 8 is stopped (step S217), the motor 17 is stopped (step S218), and cooking is finished.

  If it is determined that the load is not a small load from the type of food keyed in step S211, the rotation direction of the first stirrer 12 is finally set to the left as in the first embodiment, and the first And the openings (12a, 13a, 12b, 13b) of both the central portion and the outer peripheral portion of the second stirrers 12, 13 are superposed (FIG. 3 (c), FIG. 4 (c)). The motor 17 is driven by rotating the first stirrer 12 clockwise by determining the direction opposite to the rotation direction according to the load amount, that is, the right rotation direction opposite to the left rotation direction according to the large load. (Step S219). Next, when a predetermined time (for example, 0.5 seconds) elapses (step S220), the motor 17 is reversely rotated in the rotation direction according to the load amount, that is, the left rotation direction according to the large load, and the first stirrer 12 is moved to the second direction. Rotate counterclockwise relative to the stirrer 13 (step S221), and proceed to step S215.

  That is, at the beginning of driving, the first stirrer 12 is rotated in the direction opposite to the target direction (right rotation direction), and the second stirrer 13 may rotate together with the first stirrer 12 at this stage. However, after 0.5 second, that is, while the second stirrer 13 is rotating with the inertial force in the co-rotating direction (right rotation direction), the first stirrer 12 is reversed in the target direction (left rotation direction), Slip is surely generated between the shaft 19 and the second stirrer 13, the first stirrer 12 is rotated relative to the second stirrer 13, and the second connecting pin pair 15b, 16b is engaged. . Thereby, the opening of the microwave stirring means 14 can be reliably made into the opening pattern (pattern which opens both a center part and an outer peripheral part) according to load amount (large load). Then, since the rotation of the first stirrer 12 is continued in this state, the first stirrer 12 is maintained while maintaining the form in which the openings 12a, 13a, 12b, and 13b of both the central part and the outer peripheral part are overlapped. The second connecting pin 15b of the second stirrer 13 is pushed by the second connecting pin 15b, and the first and second stirrers 12 and 13 rotate together. In step S215, the magnetron 8 is applied to oscillate microwaves, and the microwaves are passed from the waveguide 9 through the openings 12a, 13a, 12b, and 13b in both the central portion and the outer peripheral portion of the microwave agitating means 14 in FIG. In this manner, the heating chamber 4 is irradiated and heating (cooking) of the large food 6 is started. In step S216, it is determined whether or not the temperature of the food 6 has reached a set value T (for example, 80 ° C.). If the temperature of the food 6 has reached the set value T (for example, 80 ° C.), the magnetron is determined in step S217. 8 is stopped, the motor 17 is stopped in step S218, and cooking is terminated.

  Thus, according to the high-frequency heating device of the present embodiment, even when the device is installed on an inclined surface instead of a horizontal surface, the shaft 19 and the second stirrer 13 have a contact area larger than expected, Slip can be reliably generated between them, and an opening pattern corresponding to the load can be obtained.

Embodiment 3 FIG.
FIG. 13 is a schematic configuration diagram showing a high-frequency heating device according to Embodiment 3 of the present invention, FIG. 14 is an explanatory diagram of a load position determination method by the load position determination means, and FIG. 15 is a flowchart showing the operation thereof. In FIG. 13, parts corresponding to those in FIG.

  The high-frequency heating device of the present embodiment is provided with load position determination means for determining the position of the load (food 6) on the bottom surface 5 of the heating chamber 4, that is, the camera 41, and the position image information of the food 6 photographed by the camera 41 is provided. On the basis of this, the control unit 18 controls the motor 17 to variably control the opening amount of the microwave agitating means 14, which is different from that of the first embodiment, and other configurations are the same as those described above. It is the same as that of Embodiment 1.

  Next, the operation of the high-frequency heating device of the present embodiment will be described based on FIG. 15 with reference to FIGS. 13 and 14 and FIGS. 3 and 4 of the first embodiment. First, when the door 2 is opened and closed, the food 6 is placed on the bottom surface 5 of the heating chamber 4 in the main body 1, information about cooking is input from the operation panel 3, and the food 6 is captured by the camera 41, the control unit In 18, the food portion is image-processed from the position image of the food 6 and binarized as shown in FIG. 14, and the load, that is, the position of the food is measured. FIG. 14A shows a processed image in which the rice 6a in the bowl is placed in the center of the bottom surface 5. FIG. 14B shows the state in which the rice 6a in the bowl is placed in a portion other than the center of the bottom surface 5. FIG. 14C shows a processed image in a state where the lunch box 6 b is placed at the center of the bottom surface 5.

  The camera 41 has a line 42 indicating the center area as shown in FIG. 14, and the rice 6a is only in the line 42 in FIG. 14 (a), and in FIGS. 14 (b) and 14 (c). , It can be seen that it also exists outside the line 42. Therefore, the control unit 18 determines whether or not the food is in the central area from the processed image obtained by measuring the position of the food (step S311). If the position of the food is within the central area (in the case of FIG. 14A), the rotation direction of the first stirrer 12 is determined to be right rotation, the motor 17 is driven, and the first stirrer 12 is moved. Rotate clockwise relative to the second stirrer 13 (step S312). At this time, since the second stirrer 13 is not restrained and is in a free state, it basically remains stationary, and only the first stirrer 12 rotates relatively. When the first stirrer 12 rotates by a predetermined relative angle with respect to the second stirrer 13, the first connecting pin pair 15 a, 16 a is engaged, and the central portions of the first and second stirrers 12, 13 are engaged. However, only the openings 12a and 13a at the center of the first stirrer 12 continue to rotate, although only the openings 12a and 13a are overlapped (FIGS. 3 (f) and 4 (f)). The first connection pin 16a of the second stirrer 13 is pushed by the first connection pin 15a of the first stirrer 12 while the overlapping form is maintained, and the first and second stirrers 12 and 13 rotate together. To do.

  Next, although cooking is started, the operations from the start of cooking to the end of cooking (steps S313 to S316) are the same as the operations of steps S113 to S116 in FIG. That is, a magnetron 8 is applied to oscillate microwaves, and the microwaves are irradiated from the waveguide 9 only through the openings 12a and 13a at the center of the microwave stirring means 14 into the heating chamber 4 as shown in FIG. Then, heating (cooking) of the food 6 is started (step S313).

  When cooking is started, the control unit 18 determines whether or not the load, that is, the temperature of the food 6 has reached a set value T (for example, 80 ° C.) based on the temperature information from the infrared sensor 7 (step S314). When the temperature of 6 reaches the set value T (80 ° C.), the magnetron 8 is stopped (step S315), the motor 17 is stopped (step S316), and cooking is finished.

  If it is determined in step S311 that the position of the food is also present outside the central area (FIG. 14B or FIG. 14C), the rotation direction of the first stirrer 12 is set to the left rotation. Then, the motor 17 is driven to rotate the first stirrer 12 counterclockwise relative to the second stirrer 13 (step S317), and the process proceeds to step S313. Thereby, the pair 15b, 16b of the second connecting pin is engaged, and the openings 12a, 13a, 12b, 13b of both the central part and the outer peripheral part of the first and second stirrers 12, 13 are overlapped ( 3 (c) and FIG. 4 (c)), the rotation of the first stirrer 12 is continued, so that the openings 12a, 13a, 12b, and 13b in both the central portion and the outer peripheral portion overlap each other. Is held, the second connecting pin 15b of the second stirrer 13 is pushed by the second connecting pin 15b of the first stirrer 12, and the first and second stirrers 12 and 13 rotate together. In step S313, the magnetron 8 is applied to oscillate microwaves, and the microwaves are transmitted from the waveguide 9 through the openings 12a, 13a, 12b, and 13b in both the central portion and the outer peripheral portion of the microwave stirring means 14. 7, the heating chamber 4 is irradiated and the heating (cooking) of the food 6a (or 6b) whose position is also outside the central area is started. In step S314, it is determined whether the temperature of the food 6 has reached a set value T (for example, 80 ° C.). If the temperature of the food 6 has reached the set value T (for example, 80 ° C.), in step S315, the magnetron is determined. 8 is stopped, the motor 17 is stopped in step S316, and cooking is terminated.

  As described above, also in the high-frequency heating device of the present embodiment, the microwave stirring means 14 is disposed so as to be relatively rotatable by being superimposed on the opening 11 connecting the heating chamber 4 and the waveguide 9 in the microwave supply direction. The plate-like first and second stirrers 12 and 13 having openings 12a, 12b, 13a and 13b in the central part and the outer peripheral part, respectively, and the first stirrer 12 and the second stirrer 13, A pair of first connecting pins 15a, 16a that can be engaged at a relative angular position where only the openings 12a, 13a at the center of each other overlap, and openings 12a, 13a, 12b at both the center and the outer periphery. Since the second pair of connecting pins 15b and 16b that can be engaged at a relative angular position where 13b overlaps are provided, only one of the first and second stirrers 12 and 13 is driven, so that the microwave agitation is performed. hand 14 can be switched between two modes according to the position of the food 6. For this reason, a single drive means such as a motor for driving the microwave stirring means 14 may be used, the cost can be reduced, and efficient heating can be performed according to the position of the food 6. Furthermore, since the first and second stirrers 12 and 13 can be rotated together while maintaining the state of each mode, electric field concentration on a part of the equipment can be prevented, and melting or failure of a part of the equipment can be prevented. It can be avoided and safety is improved.

  Further, if the position of the food is within the central area, the first stirrer 12 is rotated to the right to close the opening of the outer peripheral portion of the microwave stirring means 14, and only the central portion is opened. The microwave energy density directly irradiated from the central opening is increased by that amount, so that the microwave is placed in the central area of the bottom surface 5 of the heating chamber 4 as shown in FIG. Since the microwave irradiation is concentrated on the food 6, the food 6 placed in the central area can be efficiently heated. Further, when the position of the food is also present outside the central area, the first stirrer 12 is rotated counterclockwise to open both the central portion and the outer peripheral portion of the microwave agitating means 14, so that the outer peripheral portion Directly irradiate from the opening, as shown in Fig. 14 (b) or Fig. 14 (c), the entire microwave is applied to food such as rice 6a and lunch 6b where the food is located outside the central area. Therefore, the food 6 in which the position of the food is also present outside the central area can be efficiently warmed.

Embodiment 4 FIG.
FIG. 16 is a flowchart showing the operation of the high-frequency heating device according to Embodiment 4 of the present invention. Since the hardware configuration of the fourth embodiment is the same as that of the third embodiment, the description will be made with reference to FIGS. 13 to 15 and FIGS. 3 and 4 of the first embodiment. Shall.

  When the high-frequency heating device is installed on an inclined surface instead of a horizontal surface, the shaft 19 and the second stirrer 13 have a contact area larger than expected, no slip occurs between them, and the relationship with the connecting pin It is conceivable that the second stirrer 13 rotates together with the first stirrer 12 in the same direction from the beginning of driving. And in such a case, it becomes impossible to make the opening of the microwave stirring means 14 into the opening pattern according to the position of the load (food).

  The high-frequency heating device of the present embodiment reliably causes slippage between the shaft 19 and the second stirrer 13 at the beginning of driving, so that the opening of the microwave stirring means 14 has an opening pattern corresponding to the position of the load (food). It is characterized in that it can be done. Hereinafter, the operation will be described based on FIG. 16 with reference to FIGS. 13 to 15 and FIGS. 3 and 4 of the first embodiment. First, when the door 2 is opened and closed, the food 6 is placed on the bottom surface 5 of the heating chamber 4 in the main body 1, information about cooking is input from the operation panel 3, and the food 6 is captured by the camera 41, the control unit In 18, the food portion is image-processed from the position image of the food 6 and binarized as shown in FIG. 14, the load, that is, the position of the food is measured, and it is determined whether or not the food is in the central area (step S411). ). If the position of the food is within the central area (FIG. 14 (a)), the rotation direction of the first stirrer 12 is finally set to the right as in the third embodiment, and the first and second In this embodiment, only the openings 12a and 13a at the center of the stirrers 12 and 13 are superposed (FIGS. 3 (f) and 4 (f)). The motor 17 is driven in the opposite direction, that is, the left rotation direction opposite to the right rotation direction according to the small load, and the first stirrer 12 is rotated to the left (step S412). Next, when a predetermined time (for example, 0.5 seconds) elapses (step S413), the motor 17 is reversed in the rotation direction according to the food position, that is, the right rotation direction according to the case where the food is in the central area. The stirrer 12 is rotated clockwise relative to the second stirrer 13 (step S414).

  That is, at the beginning of driving, the first stirrer 12 is rotated in the direction opposite to the target direction (left rotation direction), and the second stirrer 13 may rotate together with the first stirrer 12 at this stage. However, after 0.5 second, that is, while the second stirrer 13 is rotating with the inertial force in the co-rotating direction (left rotation direction), the first stirrer 12 is reversed in the target direction (right rotation direction), Slip is reliably generated between the shaft 19 and the second stirrer 13, the first stirrer 12 is rotated relative to the second stirrer 13, and the first connecting pin pair 15a, 16a is engaged. . Thereby, the opening of the microwave stirring means 14 can be reliably made into the opening pattern (pattern which opens only a center part) according to a load position (a foodstuff exists in a center area). Then, since the rotation of the first stirrer 12 is continued in this state, the first connecting pin 15a of the first stirrer 12 maintains the form in which only the openings 12a and 13a at the center thereof are overlapped. The first connecting pin 16a of the second stirrer 13 is pushed and the first and second stirrers 12 and 13 rotate together.

  Next, although cooking is started, the operations from the start of cooking to the end of cooking (steps S415 to S418) are the same as the operations of steps S313 to S316 in FIG. That is, a magnetron 8 is applied to oscillate microwaves, and the microwaves pass through only the openings 12a and 13a at the center of the microwave stirring means 14 from the waveguide 9 into the heating chamber 4 as shown in FIG. Irradiate and start heating (cooking) the food 6 (step S415).

  When cooking is started, the control unit 18 determines whether or not the load, that is, the temperature of the food 6 has reached a set value T (for example, 80 ° C.) based on the temperature information from the infrared sensor 7 (step S416). When the temperature of 6 reaches the set value T (80 ° C.), the magnetron 8 is stopped (step S417), the motor 17 is stopped (step S418), and cooking is finished.

  If it is determined in step S411 that the food position is also present outside the central area (FIG. 14 (b) or FIG. 14 (c)), the rotation direction of the first stirrer 12 is finally set. As in the case of the above-described Embodiment 3, as the left rotation, the openings 12a, 13a, 12b, and 13b in both the central portion and the outer periphery of the first and second stirrers 12 and 13 are overlapped (FIG. 3 (c), 4 (c)) is taken, but here, the direction opposite to the rotation direction corresponding to the food position, that is, the food position is also present outside the central area (FIG. 14 (b) or FIG. 14 (c)) is determined to be the right rotation direction opposite to the left rotation direction, the motor 17 is driven, and the first stirrer 12 is rotated to the right (step S419). Next, if a predetermined time (for example, 0.5 seconds) elapses (step S420), the rotation direction corresponding to the load amount, that is, the food position is also present outside the central area (FIG. 14B or FIG. 14C). ), The motor 17 is reversely rotated in the left rotation direction, the first stirrer 12 is rotated to the left relative to the second stirrer 13 (step S421), and the process proceeds to step S415.

  That is, at the beginning of driving, the first stirrer 12 is rotated in the direction opposite to the target direction (right rotation direction), and the second stirrer 13 may rotate together with the first stirrer 12 at this stage. However, after 0.5 second, that is, while the second stirrer 13 is rotating with the inertial force in the co-rotating direction (right rotation direction), the first stirrer 12 is reversed in the target direction (left rotation direction), Slip is surely generated between the shaft 19 and the second stirrer 13, the first stirrer 12 is rotated relative to the second stirrer 13, and the second connecting pin pair 15b, 16b is engaged. . Thereby, the opening of the microwave stirring means 14 is reliably made into the opening pattern (pattern which opens both a center part and an outer peripheral part) according to a load position (a food position exists also outside a central area). Can do. Then, since the rotation of the first stirrer 12 is continued in this state, the first stirrer 12 is maintained while maintaining the form in which the openings 12a, 13a, 12b, and 13b of both the central part and the outer peripheral part are overlapped. The second connecting pin 15b of the second stirrer 13 is pushed by the second connecting pin 15b, and the first and second stirrers 12 and 13 rotate together. In step S415, the magnetron 8 is applied to oscillate microwaves, and the microwaves are transmitted from the waveguide 9 through the openings 12a, 13a, 12b, and 13b in both the central portion and the outer peripheral portion of the microwave stirring means 14. As shown in FIG. 7, the heating chamber 4 is irradiated, and heating (cooking) of the food 6 such as a lunch box whose position is also outside the central area is started. In step S416, it is determined whether or not the temperature of the food 6 has reached a set value T (for example, 80 ° C.). If the temperature of the food 6 has reached the set value T (for example, 80 ° C.), the magnetron is determined in step S417. 8 is stopped, the motor 17 is stopped in step S418, and cooking is terminated.

  Thus, according to the high-frequency heating device of the present embodiment, even when the device is installed on an inclined surface instead of a horizontal surface, the shaft 19 and the second stirrer 13 have a contact area larger than expected, Slip can be reliably generated between them, and an opening pattern corresponding to the load position can be obtained.

It is a block diagram which shows the high frequency heating apparatus which concerns on Embodiment 1 of this invention. It is a front view which shows the example of the operation panel of the high frequency heating apparatus which concerns on Embodiment 1 of this invention. It is explanatory drawing of the opening pattern of the 1st and 2nd stirrer which comprises the microwave stirring means of the high frequency heating apparatus which concerns on Embodiment 1 of this invention. It is explanatory drawing of the opening pattern of the 1st and 2nd stirrer which comprises the microwave stirring means of the high frequency heating apparatus which concerns on Embodiment 1 of this invention. It is sectional drawing which follows the axis line of the 1st and 2nd stirrer of the high frequency heating apparatus which concerns on Embodiment 1 of this invention. It is explanatory drawing of the microwave irradiation aspect at the time of the small load mode of the high frequency heating apparatus which concerns on Embodiment 1 of this invention. It is explanatory drawing of the irradiation mode of the microwave at the time of the large load mode of the high frequency heating apparatus which concerns on Embodiment 1 of this invention. It is a flowchart which shows operation | movement of the high frequency heating apparatus which concerns on Embodiment 1 of this invention. It is sectional drawing which follows the axis line of the 1st and 2nd stirrer which shows the modification of the support part of the 2nd stirrer of the high frequency heating apparatus which concerns on Embodiment 1 of this invention. It is sectional drawing which follows the axis line of the 1st and 2nd stirrer which shows the other modification of the support part of the 2nd stirrer of the high frequency heating apparatus which concerns on Embodiment 1 of this invention. It is a perspective view which shows the sliding member provided in the support part of the 2nd stirrer of the high frequency heating apparatus which concerns on Embodiment 1 of this invention. It is a flowchart which shows operation | movement of the high frequency heating apparatus which concerns on Embodiment 2 of this invention. It is a block diagram which shows the high frequency heating apparatus which concerns on Embodiment 3 of this invention. It is explanatory drawing of the technique of the load position discrimination | determination by the load position discrimination | determination means of the high frequency heating apparatus which concerns on Embodiment 3 of this invention. It is a flowchart which shows operation | movement of the high frequency heating apparatus which concerns on Embodiment 3 of this invention. It is a flowchart which shows operation | movement of the high frequency heating apparatus which concerns on Embodiment 4 of this invention.

Explanation of symbols

3 Operation panel (load amount determination means), 4 heating chamber, 5 bottom surface of heating chamber, 6 food (load), 8 magnetron (microwave oscillation means), 9 waveguide, 11 opening connecting the heating chamber and waveguide Part, 12 1st stirrer, 12a opening of central part of 1st stirrer, 12b opening of outer peripheral part of 1st stirrer, 13 2nd stirrer, 13a opening of central part of 2nd stirrer, 13b 2nd Opening of the outer periphery of the stirrer, 14 microwave stirring means, 15a, 16a first pair of connecting pins, 15b, 16b2 pair of connecting pins, 17 motor (driving means), 18 control unit, 20 radial ball bearing (Sliding member), 31 Auxiliary shaft (sliding member), 32 Ring-shaped shaft restraint (sliding member), 41 Camera (load position determining means), 42 Line indicating the center area.

Claims (8)

A heating chamber for heating the food;
Microwave oscillation means for oscillating microwaves;
A waveguide for supplying microwaves oscillated from the microwave oscillating means into the heating chamber;
Plate-shaped first and second stirrers are disposed in an opening connecting the heating chamber and the waveguide so as to be able to rotate relative to each other in a microwave supply direction, and have openings at the center and the outer periphery, respectively. A microwave stirring means comprising:
A pair of first connecting pins provided on the first stirrer and the second stirrer and engageable at a relative angular position where only the openings of the center portions of the first stirrer and the second stirrer overlap;
A pair of second connecting pins provided in the first stirrer and the second stirrer and engageable at a relative angular position where openings of both the center and the outer periphery overlap each other;
Driving means for driving the microwave stirring means;
Load amount determining means for determining the magnitude of the load;
A control unit that variably controls the opening amount of the microwave agitating unit by controlling the driving unit according to the load amount determined by the load amount determining unit;
A high-frequency heating device comprising:   When the load is determined to be small by the load amount determination unit, the control unit rotates the first stirrer in the direction in which the pair of first connection pins engages, and the center of the microwave agitation unit If only the opening of the part is opened and it is determined that the load is large, the first stirrer is rotated in the direction in which the pair of the second connecting pins are engaged, and the central part and the outer peripheral part of the microwave stirring means 2. The high frequency heating apparatus according to claim 1, wherein both of the openings are opened.   The controller, when rotating the first stirrer in the rotation direction corresponding to the load amount determined by the load amount determination means, the first direction in the direction opposite to the rotation direction corresponding to the load amount. 3. The high frequency heating apparatus according to claim 2, wherein the driving means is controlled so that the stirrer is rotated for a predetermined time and then reversely rotated in the rotation direction corresponding to the load amount. A heating chamber for heating the food;
Microwave oscillation means for oscillating microwaves;
A waveguide for supplying microwaves oscillated from the microwave oscillating means into the heating chamber;
Plate-shaped first and second stirrers are disposed in an opening connecting the heating chamber and the waveguide so as to be able to rotate relative to each other in a microwave supply direction, and have openings at the center and the outer periphery, respectively. A microwave stirring means comprising:
A pair of first connecting pins provided on the first stirrer and the second stirrer and engageable at a relative angular position where only the openings of the center portions of the first stirrer and the second stirrer overlap;
A pair of second connecting pins provided in the first stirrer and the second stirrer and engageable at a relative angular position where openings of both the center and the outer periphery overlap each other;
Driving means for driving the microwave stirring means;
Load position determining means for determining the position of the load on the bottom surface of the heating chamber;
A control unit that variably controls the opening amount of the microwave stirring unit by controlling the driving unit according to the load position determined by the load position determining unit;
A high-frequency heating device comprising:   The controller rotates the first stirrer in a direction in which the pair of first connecting pins engage when the load position is determined to be within the central area on the bottom surface of the heating chamber by the load position determining means. If only the opening at the center of the microwave agitating means is opened and the position of the load is determined to be outside the central area on the bottom surface of the heating chamber, the second connecting pin pair is engaged in the engaging direction. 5. The high frequency heating apparatus according to claim 4, wherein one stirrer is rotated to open both the central portion and the outer peripheral portion of the microwave stirring means.   When the control unit rotates the first stirrer in the rotation direction corresponding to the load position determined by the load position determination unit, the first control unit rotates in the direction opposite to the rotation direction corresponding to the load position. 6. The high frequency heating apparatus according to claim 5, wherein the driving means is controlled so that the stirrer is rotated for a predetermined time and then reversely rotated in a rotation direction corresponding to the load position.   The high-frequency heating device according to any one of claims 1 to 6, wherein the first stirrer and the second stirrer are electrically connected to each other. The sliding member is provided between the end of the shaft of the first stirrer and the second stirrer, or between the second stirrer and the heating chamber. The high-frequency heating device according to any one of claims 7 to 7.

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