JPH0569898U - High frequency heating device - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] A heater for heating and its power plug are provided on the cooking plate itself of the microwave oven, and the connection between the power plug and the power socket on the main unit side is performed at the same time when the cooking plate is inserted. If set to
Automatically check the setting condition of the cooking dish. [Structure] Heating heater 5 provided on the cooking plate of the microwave oven
Power plugs 11a, 11b and power sockets 21a, 21
detecting means (R ₁ , D ₁ , Tr ₁ ), (CT) for detecting the change of the current in the middle of the power supply circuit 49 to the heating heater 5 in which the value of the current flowing changes depending on the connection state with b. Determination means 50 for determining the set state of the cooking dishes 4a to 4c according to the detection results of the detection means (R ₁ , D ₁ , Tr ₁ ), (CT),
Display means 51, 5 for displaying the judgment result of the judgment means 50
1A is provided, and the cooking dish 4a ...
The set state of 4c can be confirmed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a high-frequency heating device having a cooking dish with a heater.

[0002]

[Prior Art]

 For example, a high-frequency heating device such as an oven or a microwave oven having a grill function is generally provided with a heater for heating at the upper part or the lower part of the refrigerator, or both of them (for example, the actual open flat 2- 110197).

Further, in general, in this apparatus, a convex shelf receiving portion is formed on both side wall portions of the inside of the refrigerator, and the cooking dish is inserted from the front side toward the rear side by using the shelf receiving portion to set the cooking dish. The cooked dish is placed on the cooked dish and is heated in the oven or grill by the upper side heater or the lower side heater (for example, Japanese Unexamined Patent Application Publication No. Hei. 130318).

However, in the configuration of the conventional general high-frequency heating apparatus described above, the upper side heater or the lower side heater has a fixing structure in which the upper side heater or the lower side heater is embedded in the ceiling portion or the bottom wall portion on the side of the high frequency heating apparatus main body (cavity). Therefore, there is a problem in that the distance from the heating heater to the object to be heated is large and the thermal efficiency is poor. In particular, since the lower heater heats the object to be heated through the cooking dish, there is a problem that sufficient heating cannot be performed unless the calorific value (wattage) is increased considerably. Moreover, if the set position of the cooking dish is changed, the heating amount itself will also change.

Further, as a result, for example, when the above-mentioned cooking dishes are to be arranged in parallel in a plurality of stages of three or more in the up-down direction, the food to be cooked in the middle cooking dish is heated from either the up-down direction. Will not be possible.

Therefore, for the purpose of solving the above-mentioned problems, for example, in the high-frequency heating device provided with the cooking plate arbitrarily set at the desired height position in the refrigerator, the cooking A heater for heating is provided directly on the bottom of the dish, and the cooking dish and the main body of the high-frequency heating device are electrically connected to each other in a state where the cooking dish is set in the refrigerator. Providing a power supply unit for supplying power to the heater is also under consideration.

If such a configuration is adopted, in the state of being set in the high-frequency heating apparatus main body side compartment, the bottom portion of the cooking dish directly generates heat to heat the object to be heated.

Therefore, the heating efficiency from the lower side is greatly improved. Further, as a result, for example, even when the cooking plates are arranged side by side in a multi-tiered structure, it is possible to heat the objects to be heated on all the cooking plates.

[0009]

[Problems to be solved by the device]

 By the way, in the case of adopting the above-mentioned configuration, the power supply unit is configured by providing a power plug on the cooking dish side and a power socket on the main body of the high-frequency heating device. The insertion connection with the socket will be done by inserting the cooking dish after all.For example, when the cooking dish is not completely inserted even if it is inserted in the refrigerator, the power supply is not supplied. It is predicted that there will be problems such as the inability of the power supply to become impossible and the generation of heat in the power socket section due to a half-energized state.

When the cooking plate is provided with the heater as described above, the lower embedded heater is generally omitted due to cost considerations. As a result, if the oven is heated without setting the cooking dish, only the upper heater will be heated, resulting in a small amount of heating, and there is a problem that the amount of rise in the internal temperature is insufficient and cooking errors occur. ..

[0011]

[Means for Solving the Problems]

 The present invention has been made for the purpose of solving the above-mentioned problems, and a heater for heating and a power plug corresponding to the heater are provided on the cooking plate itself, and a power source is provided on the main body side of the high-frequency heating device. In a high-frequency heating device in which a socket is provided and the power plug and the power socket on the main body side are connected by using the inserting operation of the cooking dish, the current flowing depending on the connection state of the power plug and the power socket Detecting means for detecting a change in the current in the middle of the power supply circuit to the heating heater whose value changes, deciding means for deciding the setting state of the cooking dish according to the detection result of the detecting means, and the deciding means It is characterized in that a display means for displaying the determination result of (3) is provided, and the set state of the cooking dish can be automatically confirmed from the display state.

[0012]

[Action]

 As described above, in the configuration of the high-frequency heating apparatus of the present invention, first, the cooking dish itself is provided with a heater for heating and a power plug corresponding to the heater, and the connection between the power plug and the main body side power socket Since the dish is inserted, the heating from at least the lower side achieves the same high heating efficiency regardless of the height of the cooking dish in the heating chamber. can do. Moreover, when the cooking dish is inserted into the heating chamber, the power plug on the cooking dish side is automatically inserted into the power socket on the heating device body side when the cooking dish is inserted into the heating chamber. Since the connection state is achieved, it is convenient and does not require special wiring.

Next, in the above configuration, the change in the current is detected in the middle of the power supply circuit for the heating heater, in which the value of the current flowing changes depending on the quality of the connection between the power plug and the power socket. Detecting means, judging means for judging the setting state of the cooking dish according to the detection result of the detecting means, and display means for displaying the judgment result of the judging means are provided respectively, and By automatically checking the setting status of the cooking plate, cooking mistakes such as forgetting to set the cooking plate or insufficient heating due to power failure due to defective setting of the cooking plate can be eliminated.

[0014]

[Effects of the Invention] Therefore, according to the high-frequency heating device of the present invention, it is possible to provide a high-frequency heating device with high heating efficiency and good usability, which effectively utilizes the feature that the cooking dish itself has a heater. ..

[0015]

【Example】

 (1) First Embodiment FIGS. 1 to 8 show the configuration of a high frequency heating apparatus according to a first embodiment of the present invention.

First, FIG. 1 shows the overall structure of the same high-frequency heating apparatus. In the figure, reference numeral 1 is the cavity on the microwave oven main body 20 side of the microwave oven with an oven function, which is the high-frequency heating apparatus. Similarly, reference numeral 2 is a heating chamber (internal space) having a predetermined volume, which is formed inside the cavity 1 and has an upper heater 46 on the ceiling. And, as shown in FIG. 2, for example, lower three steps of convex shelf receiving portions 3a to 3c and 3a to 3c are provided in parallel on both side wall surfaces 2a and 2b of the cavity 1 on the heating chamber 2 side, respectively. , The left and right shelf receiving portions 3a to 3c, 3a to 3c are used to insert the first to third cooking plates 4a to 4c from the front side to the rear side as shown in FIG. And are supported in parallel vertically.

Each of the cooking dishes 4a to 4c has a recess 18 for accommodating an object to be cooked on the upper surface side and has a bottom portion 6 at its bottom 6 as shown in detail by enlarging it in FIGS. 3 and 4, for example. For example, as shown in FIG. 5, the sheath heater 5 is arranged and fixed in such a manner that a sufficient and uniform heating area is secured. Further, a heat insulating plate 8 is attached to the bottoms of the cooking dishes 4a to 4c so as to cover the sheathed heater 5 and a heat shield plate 8 is attached by using screws 9. Further, in addition to the screws 9 for mounting the heat shield plate, convex portions 10, 10 ... Protruding a predetermined height further below the bottom position of the heat shield plate 8 are provided at appropriate positions. The plurality of convex portions 10, 10 ... Serve as the legs when the cooking dishes 4a to 4c are taken out of the heating chamber 2 and placed on the table or the like. There is.

On the other hand, reference numerals 11a and 11b are pin-shaped power plugs formed at both ends of the sheath heater 5, and the power plugs 11a and 11b are the rear end side edge portions 12b of the cooking plates 4a to 4c. Are juxtaposed to each other by a predetermined length L and are juxtaposed at a predetermined interval.

Further, as shown in FIGS. 3 and 4, a protection plate 13 covers the front end side edge portion of the cooking dishes 4a to 4c indicated by the reference numeral 12a from the front surface side to the rear surface side. It is fixed with screws 14 and 14. The front end side edge portion 12a of the cooking dish covered with the protection plate 13 is engaged with the tip side engagement portion 15a of the handle 15 for taking out the cooking dish as shown in FIG. 7, for example. The handle 15 is used to be taken out of the refrigerator. The engaging portion 15a is located below the hook portion 16 having an inverted U-shaped fitting groove that fits into the front end edge portion 12a of the cooking dishes 4a to 4c from above, and is positioned below the hook portion 16. It has a support part 17 for supporting the bottom wall portion 6a of the dishes 4a to 4c so as to effectively grip the cooking dishes 4a to 4c. In this case, generally, the cooking dishes 4a to 4c are often made of aluminum die-cast in order to reduce the weight. Therefore, the handle engaging portion is easily damaged as it is, but in the present embodiment, as described above. Since the protective plate 13 is covered on the engaging portion, such a fear does not occur.

On the other hand, as shown in FIG. 1, the power source plugs 11a and 11b on the cooking plates 4a to 4c side are provided between the back side cavity wall 1a on the range body 20 side and the external panel 19. A pair of left and right power supply sockets 21a, 21b are provided, and by inserting the power supply plugs 11a, 11b on the side of the cooking dishes 4a-4c into the power supply sockets 21a, 21b, Power is being supplied.

The power sockets 21a and 21b are, for example, as shown in FIG. 6, a metal cylindrical body portion 22 fitted and fixed in the fitting hole of the cavity wall 1a and a rear portion of the cylindrical body portion 22. A holder 23 made of synthetic resin that is integrally locked to the holder 23, a V-shaped spring-like ground-side terminal 24 fitted in the cylindrical portion 22, and a state protruding rearward from the holder 23. And a bag-shaped power jack 25 having a slit formed so as to be opened.

Then, each of the power supply terminal portions B 1 and the ground terminal portions A of the power source plugs 11a, 11b on the cooking dish 4a-4c side is securely inserted to the end as shown by the phantom line in the drawing, so that the plugs The terminals of the grounding portions on the side of the socket and the terminals of the power source, and the terminals of the power source are electrically connected to each other with good contact resistance, and power is supplied to the sheathed heater 5. Reference numeral 25a in FIG. 6 is a lead piece for wiring to the power supply.

In this case, the insertion connection between the power plugs 11a and 11b and the power sockets 21a and 21b is eventually made by inserting the cooking dishes 4a to 4c, and for example, the cooking dish 4a. If 4c is not completely inserted even if it is inserted in the refrigerator, it becomes impossible to supply the above power, or a half-energized state occurs and the power sockets 21a and 21b are It is predicted that problems such as heat generation will occur.

Further, when the sheathed heaters 5 are provided on the cooking dishes 4a to 4c as described above, the conventional lower embedded heater is generally omitted due to the cost. As a result, if the oven heating or grill heating is performed without setting the cooking dishes 4a to 4c, only the upper side heater is heated and the heating amount is small, and the amount of rise in the internal temperature is insufficient and cooking is performed. There is also the problem of making mistakes.

Therefore, in the present embodiment, for example, a cooking plate set state confirmation device as shown in FIG. 8 is provided.

That is, in FIG. 8, reference numeral R ₁ is a sensing resistor inserted in the middle of the heater current supply circuit on the range main body 20 side, and the cooking dish 4a to 4c described above is attached to the sensing resistor R _1. When the heater switch RYS is turned on while the power plugs 11a, 11b are properly inserted into the heating chamber 2 and the power sockets 21a, 21b on the range main body side are securely inserted. A heater current from 47 generates a predetermined voltage.

On the other hand, a photodiode D ₁ is connected between both ends of the sensing resistor R ₁ , and a phototransistor Tr ₁ is further coupled to the photodiode D ₁ to form a photocoupler. Further, a protection diode D ₂ is arranged in parallel with the photodiode D ₁ .

The phototransistor Tr ₁ is inserted and connected in series to the ground side of the voltage dividing circuit of the resistors R ₃ and R ₄ that define the base voltage of the switching transistor (PNP) Tr ₂ .

Therefore, when a predetermined voltage is generated across the sensing resistor R ₁ by the heater current as described above, the photodiode D ₁ is driven by the voltage to emit light, and the phototransistor Tr _{1 is} emitted by the light emission. Turns on.

[0030] As a result, voltage divider resistors R ₃ and R ₄ will be dropped to the ground, the base voltage of the switching transistor Tr ₂ is then lowered the switching transistor Tr ₂ operates ON. When the switching transistor Tr ₂ is turned on, the Vcc voltage is applied to the capacitor C, and when the charge-up is completed, the H voltage due to the Vcc voltage is kept at both ends of the resistor R ₂ , and the H voltage signal is supplied to the micro computer. Input to the control unit 50 composed of

Based on the H voltage input, the control unit 50 determines that the cooking dishes 4a to 4c are properly set in the refrigerator when there is the H input, and sets the cooking dish. The set state OK is displayed on the display unit 51.

On the other hand, between the power plugs 11a, 11b and the power sockets 21a, 21b due to improper setting (insufficient insertion) even if the cooking dishes 4a to 4c are not set at all. When electricity cannot be supplied, even if the heater switch RYS is turned on, no heater current flows through the sensing resistor R ₁ and neither the phototransistor Tr ₁ nor the switching transistor Tr ₂ is turned on.

As a result, the voltage across the resistor R ₂ remains L output.

Therefore, the control unit 50 determines that there is a cooking dish set state error based on the L input, displays the error state on the cooking dish set state display section 51, and informs the operator. At the same time asking for confirmation of the setting state of the cooking plate, prohibit ON output of the cooking button in that state. In addition, the error display is made by using, for example, a No. 2 plate so that it is possible to know which of the first to third cooking plates 4a to 4c is in error by using a display device such as a liquid crystal display. “Error” and “No3 plate error” are displayed concretely and individually.

As a result of the above, the high-frequency heating apparatus according to the present embodiment can reliably eliminate cooking mistakes such as insufficient cooking or insufficient cooking due to cooking in an unset state.

(2) Second Embodiment Next, FIG. 9 shows a cooking dish using a current transformer CT instead of the configuration using the sensing resistor and the photo coupler of the cooking dish set state confirmation device of FIG. 2 shows the configuration of a high-frequency heating device according to a second embodiment of the present invention for confirming the set state.

In FIG. 9, reference numeral 53 is a magnetron which is an electromagnetic high-frequency oscillator for heating a range, and the magnetron 53 is connected to a power source 47 via a high voltage transformer TR. Further, reference numeral 5 is a sheath heater (lower heater) provided on the cooking dishes 4a to 4c described above, and the power plugs 11a and 11b and the power sockets 21a and 21b are omitted in this figure for simplification of description. In addition, it is shown as a representative of one set.

Further, reference numeral 46 is an upper heater embedded in the ceiling of the cavity 1 described above, and is connected to a power source 47 in parallel with the sheathed heater 5 on the cooking dish side. ing.

Reference numeral RY ₁ is a first relay switch for range or heater switching, RY ₂ is a second relay switch for a range, RY ₃ is a _third relay switch for a cooking plate side sheath heater, and RY Reference numeral ₄ is a fourth relay switch for the upper heater. When the above range or heater switching first relay switch RY ₁ is switched to the range side contact and the above range second relay switch RY ₂ is turned on in this state, the above magnetron 53 is driven. And the range is heated. When the first relay switch RY ₁ is switched to the contact on the heater side, the heater is heated (oven). Further, when the third switch RY ₃ for the cooking dish side sheathed heater is turned ON in the heater heating condition, generates heat sheathed heater 5 of the cooking dish 4a~4c is energized, the upper side in addition the state When the fourth relay switch RY ₄ for the heater is turned on, the upper heater 46 is energized to generate heat.

On the other hand, reference symbol CT is a current transformer formed by using, for example, a toroidal core inserted in the primary circuit 49 of the magnetron drive circuit, and the current transformer CT has a resistor R ₁ They are connected in series, and the voltage across them is input to the control unit 50 similar to that of the first embodiment via the rectifying diode D.

In the case of the present embodiment, the control unit 50 turns ON / OFF each of the _{first to} fourth relay switches RY _{1 to} RY ₄ by the above-mentioned predetermined combination to set each combination state. From the output state (voltage level) of the current transformer CT when the predetermined switch is turned on or off, whether or not the cooking dishes 4a to 4c are set, and whether or not the set state is the same, further, the sheath heater 5 and the upper heater. It is configured so that it is possible to self-diagnose whether or not there is a break in wire 46 and whether or not the oscillation state of the magnetron 53 is good.

That is, for example, in the state where the first relay switch RY ₁ is turned on at the heater contact side, the current transformer is turned on even though the third relay switch RY ₃ for the sheath heater is turned on. in the first case or Alternatively the heater command state voltage to CT is not at all induced third Riresu switch RY ₃ with oN also the fourth relay switch RY ₄ for the upper heater the sheathed heater Nishitani Nevertheless, the voltage induced in the current transformer CT is higher than the induced voltage value when both the heaters 5 and 46 are properly energized, and the induced voltage value is only in the upper heater 46. In each case of the second case, which is the voltage value when electricity is applied, the sheath heaters 5 of the control dishes 4a to 4c are not energized. The troll unit 50 recognizes the fact and displays on the error display section 51A that the setting state of the corresponding control dish is an error (unset or defective set).

Also in the case of the present embodiment, the error display is similar to the case of the first embodiment, using a display means such as a liquid crystal, for example, and the three cooking plates 4a of the first to third sets are used. In order to understand what is an error of 4c, the display is made in a concrete and individual manner such as "No. 2 plate error" and "No. 3 plate error".

As a result, even in the high-frequency heating apparatus of this embodiment, similar to the case of the above-described first embodiment, a cooking error such as insufficient heating or insufficient heating due to cooking in a non-set cooking dish can be ensured. Can be resolved. Further, in the present embodiment, in addition to this, by changing the combination of the ON / OFF states of the _{first to fourth} relay switches RY1 to RY4, it is possible to easily disconnect the heaters or oscillate the magnetron 53. There is great merit because you can self-diagnose defects.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing the overall configuration of a high-frequency heating device according to a first embodiment of the present invention.

FIG. 2 is an external perspective view of the device.

FIG. 3 is a cross-sectional view showing a configuration of a cooking dish which is a main part of the device.

FIG. 4 is a front view (front view) of the cooking dish.

FIG. 5 is a bottom view showing the heater installation structure at the bottom of the cooking dish.

FIG. 6 is a cross-sectional view showing a structure of a power socket portion corresponding to a power plug of the cooking plate side heater in the high frequency heating device.

FIG. 7 is a partial cross-sectional view showing a structure of a front end portion of the cooking dish which is a main part of the device.

FIG. 8 is an electric circuit diagram showing a configuration of a cooking dish set state confirmation device of the same device.

FIG. 9 is an electric circuit diagram showing a configuration of a cooking dish set state confirmation device of a high-frequency heating device according to a second embodiment of the present invention.

[Explanation of symbols]

1 is a cavity, 2 is a heating chamber, 3a to 3c are shelf receiving parts,
4a to 4c are cooking dishes, 5 is a sheath heater, 6 is a cooking dish bottom, 11a and 11b are power plugs, 20 is a range main body,
21a and 21b are power sockets, 47 is a power source, 50 is a control unit, 51 is a cooking dish set state display section,
51A is an error display part, R ₁ is a sensing resistor, D ₁ is a photodiode, Tr ₁ is a phototransistor, Tr ₂ is a switching transistor, RYS is a heater switch,
CT is a current transformer, RY ₁ to Ry ₄ may first to fourth relay switch, 53 is a magnetron.

Claims (1)

[Scope of utility model registration request] 1. The cooking dish itself is provided with a heater for heating and a power plug corresponding to the heater, while a power socket is provided on the main body side of the high-frequency heating device, and the connection between the power plug and the main body side power socket is made. In the high-frequency heating device configured to perform the insertion operation, the current value changes depending on the connection state between the power plug and the power socket. The detection means for detecting the, the determination means for determining the setting state of the cooking dish according to the detection result of the detection means, and the display means for displaying the determination result of the determination means are provided, and from the display state automatically A high-frequency heating device characterized in that the setting state of the cooking dish can be confirmed.