JPH06241469A - Heating cooker - Google Patents

Abstract

PURPOSE:To obtain a safe and economical heating cooker. CONSTITUTION:In a heating cooker, constituting of a main body, having an opening unit and equipped with at least a high-frequency heating means 13 and a control unit, and a door, opening and/or closing the opening unit of the main body, and equipped with door switches 16a, 16b, putting the power supply circuit 14 of the high-frequency heating means 13 ON/OFF by opening and closing the door, the power supply circuit 14 is provided with an opening and closing means 22, opening and/or closing the power supply circuit 14 regardless of the opening and/or closing of the door.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating cooker, and more particularly to a heating cooker such as a microwave oven equipped with high frequency heating means, an oven range equipped with heating means such as the above high frequency heating means and a heater. It is a thing.

[0002]

2. Description of the Related Art A heating cooker provided with a microwave oven, a microwave oven, or a griller having a heating means such as a heater is widely used as a cooker for household use. FIG. 13 is a perspective view of an ordinary microwave oven with the door opened, and FIG. 14 is a circuit diagram of the magnetron drive circuit. In the figure, reference numeral 1 denotes a main body of a microwave oven, which comprises a heating cabinet 2, an operating portion 3 projecting from one side of a front surface, a control portion housed in the rear surface of the operating portion 3, a magnetron (not shown), and the like. The side walls of the heating chamber 2 are provided with power feed ports 4a and 4b through which microwaves from the magnetron are emitted, and a turntable 5 is provided at the bottom. Reference numeral 10 denotes a door that is attached to the main body 1 so as to be openable and closable, and has a door handle 11 provided on the front surface, and interlocking with the door handle 11 on the back surface thereof, locking holes 7a, 7b provided on the front plate 6 of the main body 1. Latches 12a and 12b are provided to lock the door 10 by fitting and locking the same.

Reference numeral 13 is a magnetron drive circuit provided in the main body 1, 15 is a commercial power source, and 16a and 16b are main body 1
The door switch is provided on the back surface of the locking holes 7a and 7b and is turned on / off by the latch mechanism when the door 10 is opened / closed. Reference numeral 17 is a relay switch which is connected in series with the door switches 16a and 16b and which is turned on and off in response to a command from the control unit.
It is connected to the primary side of the high-voltage transformer 18 via 6a, 16b and the relay switch 17, and constitutes a power supply circuit 14a. Reference numeral 19 is a high frequency oscillator connected to the secondary side of the high voltage transformer 18, and 20 is also a magnetron, which is driven by the high frequency oscillator 19 and outputs a microwave. The magnetron drive circuit 13 is controlled by the control unit provided in the main body 1.

In the microwave oven as described above, first, when the cooking container containing the food to be cooked is placed on the turntable 5 and the door 10 is closed, the latches 12a and 12b are locked in the locking holes 7a and 7b. The door 10 is locked by fitting and the door switches 16a and 16b are turned on. Then,
When the cooking temperature, time, etc. of the food to be cooked are set by the operation unit 3, the relay switch 17 is turned on by a command from the control unit.
Then, the power supply 15 is connected and the magnetron 20 is driven, and microwaves are emitted from the power supply ports 4a and 4b into the heating chamber 2 to heat the food to be cooked.

When the set cooking time elapses, the relay switch 17 is turned off by a command from the control unit, and the microwave emission is stopped. Door 1 to take out the food
When 0 is opened, the door switches 16a and 16b are also turned off. Also, if the door 10 is opened for some reason during cooking, the door switches 16a and 16b are turned off and the microwave emission is stopped, so there is no danger even if a hand or the like is put in the heating chamber 2.

[0006]

In the above-described heating cooker, the power circuit 14 is not provided with a power switch for turning the power 15 on and off regardless of whether the door 10 is opened or closed. An electric current is made to flow into the operation portion 3 simply by inserting it into the operation portion 3. In general, various household appliances such as heating cookers are often left plugged in at all times, so if the heating cooker is left plugged in, the microcomputer may run out of control. Therefore, it may operate without permission, and microwave may be emitted into the heating chamber 2.

Further, the relay switch 17 of the power supply circuit 14 constituting the magnetron drive circuit 13 is turned on due to welding of the relay or the like for a long-term use or other reasons, and does not turn off even if a command is sent from the control section. There is. In such a case, when the door 10 is closed after cooking is finished, the door switches 16a and 16b are turned on by the latch mechanism, the power circuit 14 is kept on, and the magnetron 20 continues to emit microwaves. Therefore, if left unattended for a long period of time, there is a risk of fire or electric shock, which is not only a safety problem, but also extremely uneconomical.

The present invention has been made to solve the above problems, and an object thereof is to obtain a safe and economical heating cooker.

[0009]

According to the present invention, there is provided a main body having an opening portion and at least a high frequency heating means and a control portion,
It consists of a door that opens and closes the opening of the main body, and the power circuit of the high frequency heating means is turned on and off by opening and closing the door.
In the heating cooker equipped with the door switch, (1) the power supply circuit is provided with opening / closing means for opening / closing the power supply circuit regardless of opening / closing of the door.

(2) Further, an opening / closing means is provided in front of the door switch, and an opening / closing means control device is connected between the opening / closing means and the door switch to open / close the heating object when heating of the object to be heated is completed. The control device is configured to automatically turn off the opening / closing means to open the power supply circuit. (3) Alternatively, the opening / closing means is provided in front of the door switch, and the opening / closing means is provided between the opening / closing means and the AC power source. When the control device is connected and the door is opened, the opening / closing means is automatically turned on by the opening / closing means control device.

(4) Further, in each of the above heating devices, the opening / closing means is slid along with the fixed microswitch and the microswitch is turned off.
(5) Alternatively, the movable element is driven by the action of an electromagnetic coil, and (6) the opening / closing means is provided at the bottom of the range main body rearward from the rear opening portion. It is a thing.

[0012]

[Action]

(1) The power supply circuit is opened and closed regardless of whether the door is open or closed by manually turning on and off the opening and closing means. (2) When the food to be cooked is finished, the opening / closing means is automatically turned off by the output signal of the opening / closing means control device, and the power supply circuit is opened regardless of whether the door is opened or closed. When heating, the opening / closing means is manually turned on to close the power supply circuit. (3) When the door is opened to heat the food to be cooked, the opening / closing means is automatically turned on by the output signal of the opening / closing means control device.
N, and the power supply circuit is closed. When heating is completed, the opening / closing means is manually turned off to open the power supply circuit.

(4) When the movable element is slid to one side, the actuator of the micro switch is pressed down to be turned on, and when it is slid to the other side, it is separated from the actuator and turned off. (5) A movable iron piece is arranged on an electromagnetic coil having an iron core,
When a current is applied to the electromagnetic coil, the movable iron piece is attracted to press the movable element, turning the microswitch ON or OFF.
When the current is cut off, the movable element returns to its original position and turns the microswitch off or on. (6) The opening / closing means provided at the bottom of the range main body is operated with the door opened or closed.

[0014]

【Example】

Example 1. FIG. 1 is a block diagram showing the outline of the circuit configuration of the first embodiment of the present invention. The same parts as those of the conventional example described with reference to FIG. 14 are designated by the same reference numerals, and the description thereof will be omitted. In the figure, 21 is a plug connected to a commercial power source,
Reference numeral 22 is a main switch inserted between the plug 21 and the one door switch 16b, and 23 is a fuse inserted between the plug 21 and the other door switch 16a. Reference numeral 24 is a monitor switch connected between the door switches 16a and 16b, which is for ensuring the safety by cutting the fuse 23 when the latch mechanism has a short-circuit fault. ing.

The above-mentioned main switch 22 is, for example, as shown in FIG.
As shown in (a), the plug 21 and the latch switch 16
fixed micro switch 25 to which b is connected, and knob 2
2 and a movable element 27 that slides along the microswitch 25. As shown in FIG. 2A, the plug 21 is inserted into the power source and the movable element 27 is moved in the direction of the arrow b by the knob 28. When slid, the movable element 27 is disengaged from the actuator 26 of the micro switch 25, the micro switch 25 is turned off, and the power supply circuit 24 is opened.
Further, as shown in FIG. 2B, when the movable element 27 is slid in the direction of arrow a by the knob 28, the movable element 27 presses the actuator 26 of the micro switch 25 to turn on the micro switch 25, and the power source is turned on. The circuit 14 is closed.

In the main switch 22 including the micro switch 25 and the movable element 27 as described above, for example, as shown in FIGS. 3 and 4, the knob 28 is located at the bottom of the microwave oven main body 1 slightly rearward of the front plate. Therefore, the side opening door 10 is attached at a position where it does not interfere with the opening and closing of the door 10 to facilitate the operation, and even if steam generated by heating the food to be cooked is transmitted to the inside of the door 10 and drips. There is no risk of water droplets splashing on the main switch 22. Then, the plug 21 is connected to the power source, and the movable element 27 is slid in the arrow a or b direction by the knob 28, whereby the power circuit 14 can be turned on and off. The connection position of the main switch 21 is not limited to the illustrated case, and may be provided at another position in the power supply circuit 14. Further, the mounting position is not limited to the bottom portion of the microwave oven body 1, but can be appropriately changed by, for example, providing the operation portion 3 or a side wall of the microwave oven body 1.

As described above, in this embodiment, since the main switch is provided in the power supply circuit and the power supply circuit is opened when the microwave oven is not used, by turning off the main switch after heating is completed, Not only is it safe because all electric circuits can be opened, but it is economical because the power can be easily turned off when not in use. Further, even if an erroneous operation occurs due to a runaway of the microcomputer while heating the food to be cooked, it can be stopped easily by turning off the main switch.

Example 2. FIG. 5 is a block diagram of a second embodiment of the present invention, and FIG. 6 is a circuit diagram showing an example of the main switch controller. The main switch control device 30
It comprises a control current circuit 32 connected to the commercial power supply 15 via a transformer 31, a microcomputer 33 to which the output of the control current circuit 32 is added, an electromagnetic coil drive circuit 34 driven by the microcomputer 33, and an electromagnetic coil 35. .

FIG. 8 shows an example of an opening / closing device for the main switch 22 by means of the electromagnetic coil 35. 22 is shown in FIG.
The main switch including the micro switch 25 described above and the movable element 27 slidably contacting the micro switch 25.
At the bottom of the, recesses 27a and 27b that engage with the fixed stoppers 29a and 29b are provided. Reference numeral 35 is an electromagnetic coil, 36 is an iron core thereof, and 37 is an L-shaped movable iron piece rotatably supported by a shaft 38, and a spring 39 applies a rotational force in the arrow direction.

In the switchgear described above, in the state shown in FIG. 8, a current flows through the electromagnetic coil 35 to excite the iron core 36, attract the movable iron piece 37 and rotate it counterclockwise, and one end thereof moves the movable element 27. Is pressed in the direction of arrow b to turn off the main switch 22. In addition, the electromagnetic coil 35
When the exciting current is cut off, the iron core 36 is demagnetized, and the movable iron piece 37 is urged by the spring 39 to rotate clockwise.
At this time, since the recess 27a provided in the bottom of the movable element 27 is fitted into the stopper 29a and held at that position, the main switch 22 continues to be in the OFF state. In addition,
When the main switch 22 is turned on, the movable element 27 is manually slid in the direction of arrow a as shown in FIG. 9, and the recess 27b is fitted into the stopper 29b and held at that position.

Next, the operation of this embodiment constructed as described above will be described. When heating an object to be cooked with a microwave oven, a container containing the object to be cooked is placed on the turntable 5 of the heating chamber 2 (see FIG. 3 below), and the door 10 is closed. As a result, the latches 12a, 12b are locked in the locking holes 7a,
The door 10 is locked by being inserted into 7b and the door switches 16a and 16b are turned on. In this state, the knob 28 of the main switch 22 provided on the bottom of the microwave oven main body 1
9 is manually slid in the direction of the arrow a to turn on the main switch 22 to close the power supply circuit 14, as shown in FIG.

Next, when the heating temperature, the heating time and the like for the food to be cooked are set by the operation section 3, the relay switch 17 is turned on by a command from a control section (not shown),
The power supply circuit 14 is closed and the magnetron 20 is driven, and microwaves are emitted from the power supply ports 4a and 4b into the heating chamber 2 to heat the food to be cooked. During this period, the DC current is supplied to the microcomputer 33 from the control current circuit 32, and charges are accumulated in the capacitors C ₁ , C ₂ , and C ₃ of the control current circuit 32.

When the set heating time elapses, the relay switch 17 is turned off by a command from the control unit, and the microwave emission is stopped. In addition, a voltage is applied from the microcomputer 33 to the electromagnetic coil drive circuit 34 so that the electromagnetic coil 35
The excitation voltage is applied to the main switch 22 and the main switch 22 is turned off when T ₁ time elapses after the heating is completed, as shown in FIG. However, even if the main switch 22 is turned off, the microcomputer 33 still has the capacitor C of the control current circuit 32.
_The charge accumulated in _{1 to} C ₃ is supplied to the exciting coil 35.
Current flows to the electromagnetic coil 35, and after the main switch 22 is turned off, the limit voltage at which the iron core 36 can suck and hold the movable iron piece 37, that is, the fall time T ₂ to the holding voltage of the electromagnetic coil 35 has elapsed. Be cut off. As a result, the movable element 27 slides without stopping or returning in the middle, and the main switch 22 is surely turned off.
The operation time of the electromagnetic coil 35 needs to be within T ₁ + T ₂ hours before the reset voltage of the microcomputer 33 is reached.

Example 3. FIG. 10 is a block diagram of the third embodiment of the present invention. In the second embodiment, when heating the food to be cooked, the main switch 22 is manually turned on.
However, the case where the main switch 22 is automatically turned off when the heating is finished has been described, but in this embodiment, the main switch 22 is automatically turned on when the food to be cooked is heated and the heating is finished. In this case, the main switch 22 is manually turned off.

In this embodiment, the main switch control device 30 is used.
The main switch 22 is provided between the connection portion of the door switch and the door switch 16b (or 16a). Further, as shown in FIGS. 11 and 12, the switchgear of the power supply circuit 14 has a main switch 22 when a current flows through the electromagnetic coil 35.
Is turned on and turned off when the current is cut off.

Next, the operation of this embodiment will be described. In the present embodiment, when the plug 21 is connected to the power source, the main switch control device 30 is always applied with the voltage. After heating the object to be heated, the door 10 is opened to take out the object to be heated, the door 10 is closed, and the main switch 22
When the door 10 is opened again after being manually turned off, a voltage is applied from the microcomputer 33 to the electromagnetic coil drive circuit 34 and a current flows through the exciting coil 35, and the movable iron piece 37 is attracted by attracting the movable iron piece 37 as shown in FIG. Movable element 27 at one end
Is pressed and slid, the main switch 22 is turned on, and this state is continued.

Next, when the door 10 is closed, the door switches 16a and 16b are turned on, and the food to be cooked is heated as in the case of the first embodiment. When the food to be cooked is finished, the movable element 27 is moved in the direction of the arrow b as shown in FIG.
Open up.

As described above, in the second and third embodiments, the main switch of the power supply circuit is automatically turned off or on at the end of heating or the start of heating, so safe and economical cooking is possible. Moreover, even if the microcomputer runs out of control, it can be stopped easily by turning off the main switch.

In the above description, the case where the micro switch is used as the main switch is shown, but other switch mechanism may be used. Further, although the case where the drive mechanism of the main switch is constituted by the exciting coil, the iron core and the movable iron piece is shown, other mechanism may be used as long as it is electrically operated.

[0030]

As is clear from the above description, in the heating cooker according to the present invention, the power supply circuit of the high frequency heating means is provided with the opening / closing means for opening / closing the circuit manually or automatically.
When not in use, all the electric circuits can be cut off by this opening / closing means. Therefore, not only a safe and economical heating cooker can be realized, but also when a malfunction occurs due to a microcomputer runaway or the like, the power can be easily opened to stop the malfunction.

Also, by using a micro switch as the opening / closing means, the power supply circuit can be opened and closed with reliability, so that safety is improved and, moreover, contact consumption is small,
Can withstand long-term use. Further, by providing the opening / closing means at the bottom of the range main body rearward of the opening, a convenient cooker can be obtained.
In addition, by driving the microswitch with an electromagnetic coil, it is possible to realize an automatic opening / closing means that is safe and operates reliably.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an outline of a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of an embodiment of the main switch of FIG.

FIG. 3 is a perspective view showing a mounted state of the main switch of the first embodiment.

FIG. 4 is a side view of FIG.

FIG. 5 is a circuit diagram showing an outline of a second embodiment of the present invention.

6 is a circuit diagram of an embodiment of the main switch controller of FIG.

FIG. 7 is a diagram illustrating an operation of the main switch control device of FIG.

8 is a configuration diagram of an embodiment of the main switch of FIG.

FIG. 9 is an explanatory view of the operation of FIG.

FIG. 10 is a circuit diagram showing an outline of a third embodiment of the present invention.

11 is a block diagram of an embodiment of the main switch of FIG.

FIG. 12 is a diagram for explaining the operation of FIG.

FIG. 13 is a perspective view of an example of a conventional microwave oven.

FIG. 14 is a circuit diagram of a magnetron drive circuit of a conventional microwave oven.

[Explanation of symbols]

 1 range main body 2 opening part 3 operation part 5 turntable 6 front plate 7a, 7b locking hole 10 door 12a, 12b latch 13 magnetron drive circuit 14 power supply circuit 15 power supply 16a, 16b door switch 17 relay switch 20 magnetron 22 main switch 25 Micro switch 27 Moving element 28 Knob 30 Main switch control device 32 Control current circuit 33 Microcomputer 34 Electromagnetic coil drive circuit 35 Electromagnetic coil 36 Iron core 37 Moving iron piece

Claims (6)

[Claims] 1. A main body having an opening and provided with at least a high-frequency heating means and a control section, and a door for opening and closing the opening of the main body. The power supply circuit of the high-frequency heating means by opening and closing the door. A heating cooker having a door switch for turning on and off, wherein the power supply circuit is provided with an opening / closing means for opening and closing the power supply circuit regardless of whether the door is opened or closed. 2. A main body having an opening and provided with at least a high-frequency heating means and a control section, and a door for opening and closing the opening of the main body. The power supply circuit of the high-frequency heating means by opening and closing the door. In a heating cooker having a door switch for turning on and off, an opening / closing means is provided in front of the door switch, and an opening / closing means control device is connected between the opening / closing means and the door switch. When the heating of the object is completed, the opening / closing means is automatically turned off by the opening / closing means control device to open the power supply circuit. 3. A main body having an opening and provided with at least a high-frequency heating means and a control section, and a door for opening and closing the opening of the main body. The power supply circuit of the high-frequency heating means by opening and closing the door. In a heating cooker equipped with a door switch for turning on and off, an opening / closing means is provided in front of the door switch, and an opening / closing means control device is connected between the opening / closing means and an AC power source. A heating cooker characterized in that, when opened, the opening / closing means is automatically turned on by the opening / closing means control device. 4. The opening / closing means is constituted by a fixed micro switch and a movable element which slides along the micro switch to turn the micro switch on and off. The heating cooker according to 3. 5. The cooking device according to claim 4, wherein the movable element is slid by the action of an electromagnetic coil driven by the output of the opening / closing means control device. 6. The opening / closing means is provided at the bottom of the range main body rearward of the opening,
The heating cooker according to 3, 4, or 5.