JPS628688B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a composite cooking device equipped with a high frequency heating source and an external heating source such as gas or electricity.

This type of composite cooker is equipped with a timer for setting the heating time for both the high-frequency heating source and the external heating source, and the timers are used depending on the cooking content. When using complex cooking (combined mode), both of the above timers are set separately, but in this case, the timer for the high frequency heating source should be set much shorter than the timer for the external heating source depending on the cooking content due to the amount of energy. It is used as

On the other hand, it may be possible to simplify the operation by controlling the above-mentioned high-frequency heating source and external heating source with one timer, but in the combination mode, if the timer is set to the high-frequency heating source, the heating time by the external heating source will be reduced. If the ingredients were insufficient, and conversely, the heating time using the high-frequency heating source was too long, and delicious cooking results could not be obtained.

The present invention has been made in view of the above points, and the output of the high-frequency heating source is set to low in the combined mode, and in the combined mode, the external heating source and the high-frequency heating source are balanced as much as possible for cooking. This timer can be shared by each mode.

Below, the example will be explained with reference to the figures.
is a composite cooker that opens and closes the cavity with a vertically swinging door 2, and on the front there are a start switch knob 3, a thermo knob 4 for temperature adjustment, a timer knob 5, and a high-frequency heating source for switching the usage mode. A usage mode knob 6, a usage mode knob 7 for the gas heating source, a combination mode knob 8 for both heating sources, and a lever 9 for controlling gas supply to the gas heating source are provided. Here, the above-mentioned timer has a normal time scale in the clockwise rotation range of the knob 5 with zero as the center, and one position rotated counterclockwise is the preheating position.

The high frequency heating source and the gas heating source are electrically controlled, and the electric circuit for controlling them is described below.
This will be explained based on the diagram. Reference numeral 10 denotes a high-frequency heating source mainly composed of _an oscillation power supply having a power supply lamp EL, a pair of capacitors C ₁ and C ₂ for output switching, _and a magnetron MG. It is possible to output approximately 500W and approximately 200W by changing the capacity. 12 is a combustion control device 13
It is a gas heating source that controls gas supply to the gas burner 14 and ignition combustion, and has a gas supply lamp GL that is powered together with the second electromagnetic valve SV ₂ when gas is supplied to the gas burner 14. In addition, IG is a spark plug, FR
is the frame rod, and _SV1 is the first solenoid valve. The above-mentioned power supply lamp EL and gas supply lamp GL are arranged at appropriate positions on the front of the vessel.

The power source 15 has a first door switch 17 and a starting switch 18 connected in series to a first power line 16, and a second
A fuse FU and a changeover type second door switch 20 are connected in series to the power line 19. Various elements are connected between the first and second power supply lines 16 and 19, but first, a lamp L for the cavity is connected after the fuse Fu together with the first contact _T1 of the timer T. Furthermore, a monitor switch 21 is connected after the first door switch 17. Further, the door opening contact 22 of the second door switch 20 is connected to the lamp L.

A second timer T is set after the start switch 18 and the second door switch 20 by the knob 5.
A blower motor BM for cooling the magnetron MG is connected to the contact point _T2 , and a blower motor BM for cooling the magnetron MG is connected to the subsequent stage, and a circulation fan motor FM for circulating and appropriately discharging the hot air in the cavity is connected to the subsequent stage. This fan motor FM has forward/reverse switch 2
The cavity structure allows hot air to be smoothly discharged during normal rotation, but during reverse rotation, the exhaust is suppressed and only circulation is performed. Further, a third contact _T3 of the timer T is connected to the second power line 19 between the timer T and the blower motor BM. this fan motor
The first power supply line 16 after the FM is equipped with three high frequency mode switches 24 and a gas mode switch 25, one of which is selectively activated by the use mode knobs 6, 7, and 8. , a combination mode switch 26 is connected. The high frequency mode switch 24 is connected to the second power supply line 19 via the high frequency heating relay 27 and the normally closed preheating contact _T4 of the timer T, and the combination mode switch 26 is connected to the second power supply line 19 through the combination relay 28. . Thereafter, the first power line 16 is connected to the oscillation power source via the high frequency heating switch 29, and the second power line 19 is connected to the oscillation power source via the high frequency heating switch 29.
is directly connected to the oscillation power source, but the second power source line 19 is further connected to the combustion control device 13 via a thermostat 30 set by the knob 4 to detect the temperature inside the cavity.

The gas mode switch 25 is connected to the combustion control device 13 and the forward/reverse relay 31, and is connected to the second power line 1 after the thermostat 30 via these.
Connected to 9. Two combination contacts 32, 32 of the combination relay 28 are connected in parallel to the high frequency mode switch 24 and the gas mode switch 25, respectively.
Further, an output switching relay 33 is connected in parallel to the combined use relay 28.

Next, the operation of the present invention will be explained. When the door 2 is opened, the lamp L is supplied with power from the door opening contact 22 and turns on. When the food to be cooked is placed in the cavity and the door 2 is closed, the lamp L is turned off and the monitor switch 2 is turned off.
1 opens, the first door switch 17 closes.
Next, when the timer T is set clockwise, the first, second, and third contacts T ₁ , T ₂ , and T ₃ are closed, and the preheating contact T ₄ is also closed. When one of the mode switches 24, 25, and 26 is selected and closed, and the start switch 18 is closed with its knob 3 and mechanically held, the lamp L lights up and the blower motor BM is driven. The magnetron MG is cooled down, and the timer T begins to return to zero. Depending on the selection of the mode switches 24, 25, and 26, this operation can be one of high frequency heating, gas heating, and a combination of these heating operations.

When the high-frequency mode switch 24 is closed, the high-frequency heating relay 27 closes its switch 29 and operates the high-frequency heating source 10 to perform a high-frequency heating operation. At this time, the forward/reverse switch 23 of the fan motor FM remains in the reverse direction, so the fan motor FM rotates in the reverse direction and exclusively circulates hot air. and,
Since the output selector switch 11 remains closed, two capacitors C ₁ and C ₂ are connected, and in this case, the magnetron MG has a high output of about 500W. Also, the power supply lamp EL is lit. When the timer time elapses, timer contacts _T1 , _T2 , and _T3 open except for preheating contact _T4 , so lamp L and power supply lamp EL go out, blower motor BM and fan motor FM stop, and high-frequency heating starts. The high frequency heating operation by the source 10 is also stopped. Since the start switch 18 is kept closed, if the timer T is set as it is, the heating operation will be restarted immediately.
When the door 2 is opened, the starting switch 18 is released from closing.

When the gas mode switch 25 is closed,
The combustion control device 13 and forward/reverse relay 31 of the gas heating source 12 are supplied with power when the thermostat 30 is closed, and the gas burner 14 is ignited and burned to perform a gas heating operation. Since the forward/reverse switch 23 is set to the forward rotation side, the fan motor FM rotates forward to circulate hot air and smoothly exhaust air, and at the same time smoothly supplies combustion air to the gas burner 14. Also, the gas supply lamp GL lights up. thermostat 30
closes when the temperature inside the cavity is lower than the set temperature, and opens when it rises. Accordingly, the gas heating source 12 operates intermittently in response to the opening and closing of the thermostat 30 to maintain the set temperature. When the thermostat 30 opens, on the other hand, the forward/reverse relay 31 changes its switch 23 to the reverse side, so the fan motor FM rotates in the reverse direction, and the fan motor FM suppresses the discharge of hot air inside the cavity and keeps the inside of the cavity warm. In this way, the open time of the thermostat 30 is lengthened to shorten the combustion time, thereby saving energy and increasing heating efficiency. When the timer time elapses, the lamp L and the gas supply lamp GL are turned off, the blower motor BM and the fan motor FM are also stopped, and the gas heating operation by the gas heating source 12 is also stopped.

When the combination mode switch 26 is closed, the combination relay 28 closes its combination contacts 32, 32,
If the thermostat 30 is closed, the high frequency heating relay 27, forward/reverse relay 31, and output switching relay 3 are activated.
3, and each switch 29, 23, 11 is activated. Further, a combustion control device 13 for the gas heating source 12
to supply power. Therefore, the output selector switch 11 is opened, the high frequency heating source 10 performs high frequency heating at a low output of about 200 W, and the fan motor FM rotates normally. In this state, the gas heat source 12 is also activated to perform composite heating using both gas combustion and high-frequency radio waves. When this combination is used, the heating time is short and the output of high-frequency radio waves is low, so it is relatively balanced with the combustion heating by the gas burner 14, and the cooking time can be set with the same heating time using a common timer. thermostat 30
The gas heating source 12 operates intermittently by opening and closing the fan motor FM, and when the fan motor FM is opened, the fan motor FM rotates in reverse. When the timer time has elapsed, both heating sources 10 and 12 are stopped simultaneously.

When the timer T is operated counterclockwise and set to the preheating position, timer contacts T ₁ , T ₂ , T ₃ are closed and preheating contact T ₄ is opened. For this reason, even if the high-frequency mode switch 24 of the mode switches 24, 25, and 26 is closed, or even if the combination mode switch 26 is closed and the combination contact 32 is closed, the high-frequency heating relay 27 will not operate. First, high frequency heating source 1
0 does not work. Therefore, preheating by the gas heating source 12 is performed without dry heating by high frequency heating,
The cavity is preheated to the set temperature. During this preheating, the timer T is continuous and does not return to zero, and when the preheating is complete, the supply gas lamp GL reaches 30.
It can be recognized by deducting points according to the opening and closing of the terminal. When preheating is finished, the door 2 is opened and the start switch 18 is opened to return the timer, or the timer T is manually operated clockwise to return to zero.

Fig. 3 is an electrical circuit diagram of another embodiment of the present invention, in which the blower motor, fan motor, etc. are omitted for the sake of explanation, and the electrical circuit diagram is simplified, and it is possible to heat not only at high output but also at low output during high-frequency heating. . That is,
The high-frequency heating source 10 is always set at low output, and when the two-contact first mode switch _MS1 is closed, the output switching device 34 and the high-frequency heating source 10 are activated to heat at high output. 2nd mode switch
When the MS ₂ is closed, only the high frequency heating source 10 is activated and heats at low power. Third mode switch MS ₃
When closed, the gas heating source 12 is activated and gas heating is performed. Two-contact 4th mode switch MS ₄
When closed, the high frequency heating source 10 and the gas heating source 12
is activated, and low-output high-frequency heating and gas heating are used together. In this embodiment, the starting switch 18 is connected in parallel with the self-holding contact 36 of the relay 35, but it may be mechanically held as in the first embodiment.
Also, since the number of mode switches has been increased by one, a knob for this is provided on the front of the device. As in the first embodiment, these mode switches MS ₁ to _{MS 4} are of a type that allows only one of them to be closed.

In this manner, the present invention reduces the heating energy for the heating time of the high-frequency heating source and the external heating source by reducing the output of the high-frequency heating source to a low output during the combination mode in which the high-frequency heating source and the external heating source are operated simultaneously. By setting the time using a common timer for both, it is possible to significantly improve the operability of setting the timer during cooking. Cooking failures caused by setting the heating time can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a front view of a composite cooking device according to the present invention, FIG. 2 is an electric circuit diagram, and FIG. 3 is a simplified electric circuit diagram of another embodiment. 10... High frequency heating source, 11... Output switching switch, 12... Gas heating source, T... Timer, 24... Mode switch for high frequency, 25... Mode switch for gas, 26... Combination mode switch, 33... Output switching relay.

Claims (1)

[Claims] 1. In a device equipped with a high frequency heating source capable of switching between high and low outputs and an external heating source, a mode switching means for switching between a mode of use of the high frequency heating source, a mode of use of the external heating source, and a mode of combination of both heating sources, respectively; , a timer for setting a single cooking time shared by each mode, and an output switching means for setting the output of the high frequency heating source to a low output when switching to a combined mode of the mode switching means. A composite cooker featuring: