JPS5813812B2 - High frequency heating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a composite high-frequency heating device that combines an electric oven and a microwave oven, or a gas oven and a microwave oven.

Recently, a combination type product that incorporates a heater into a microwave oven and can also be used as an electric oven has been gaining popularity.

However, when high-frequency heating is performed by driving a magnetron, the ambient temperature inside the oven is close to room temperature, and only the food is heated to a high temperature, so the steam generated from the food is transferred to the walls and doors and windows of the oven. There is a phenomenon where condensation forms on the inner surface of the window, forming water droplets, and causing the windows to fog up.

On the other hand, when heating the food in the oven by driving the heater, the ambient temperature inside the oven is raised to heat the food, so the inside of the oven needs to be kept in a nearly hermetically sealed state.

Therefore, there has arisen a need to be able to switch the conditions inside the oven that are suitable for heating by each heat source.

That is, a mechanism is provided that blows air into the oven during high-frequency heating and cuts off the air into the oven when heating the oven.

In order to realize this, the applicant filed a patent application in 1983-108
An example is proposed by No. 20.

The present invention provides a complex type high-frequency heating device in which a damper that selectively switches between introducing and cutting off air into the oven is automatically operated by a solenoid.

FIG. 1 is a schematic configuration diagram of an oven range according to an embodiment of the present invention, in which heaters 2 and 3 are provided above and below an oven interior 1, and 2 4 5 0 is output from a magnetron 4 provided outside the oven. A high frequency wave of MHz was supplied to the oven interior 1 through the waveguide 5 to heat the food A placed on the tray 6 with high frequency, while the upper heater 2 and the lower heater 3 were energized to generate heat. In this case, the atmospheric temperature inside the oven chamber 1 is raised to heat the oven.

The blower fan 7 rotates during the cooking of the food A and supplies outside air to the duct 8.

A rotatable damper 9 is provided in the duct 8, and is located at the position indicated by the solid line during high-frequency heating, and cools the outside air supplied by the blower fan 7 by passing it through the cooling fins of the magnetron 4. The air is guided into the oven interior 1 through an intake port 10 provided on the oven wall as shown by the arrow.

On the other hand, during open heating, the air is at the position indicated by the broken line, and the introduction of outside air into the magnetron 4 and the oven interior 1 is cut off, and the air is exhausted from the outer casing of the microwave oven main body as indicated by the broken line arrow.

In addition, the outside air introduced into the oven interior 1 is
The water vapor generated from food A is circulated through the exhaust port 1.
It is discharged from 1.

FIG. 2 is an external perspective view of the drive mechanism of the damper 9, FIG. 3 is a plan view thereof, and FIG. 4 is a side view thereof.

According to these, the first and second solenoids 1 are mounted on the base 14.
2.13 is fixed at a distance, and the mover 15 is movably supported on this.

A connecting rod 17 connected to a cam plate 16 is fixed to the center of the movable element 15, and a pin 18.1 is erected from the base 14.
The cam plate 16 has elongated holes 20 and 21 engaged with the head portion of the cam plate 9.
is moved together with the mover 15.

A connecting pin 22 is fixed to one end of the cam plate 16 and is connected to a damper drive lever 23 rotatably supported by a support pin 24 erected from the base 14 .

A reversing spring 2 is attached to a cut-and-raised piece 25 formed at one end of the damper drive lever 23 and a pin 26 erected from the base 14.
7 (For convenience, it is not drawn at a predetermined position in FIG. 2.

) are fixed at both ends.

The passive lever 29 fixed to the end of the pivot shaft 28 of the damper 9 is connected to the damper drive lever 23 by engagement of the connecting rod 30 fixed to the end of the damper drive lever 23 and the elongated hole 31. Ru.

The damper drive mechanism consisting of a combination of the above-mentioned parts operates as follows.

When the first solenoid 12 is energized and operated in the state shown in FIG. 2, the movable element 15 is moved upward in the drawing.

The cam plate 16 moves upward in conjunction with the mover 15 and guided by pins 18 and 19, and the damper drive lever 23 is rotated counterclockwise to switch to the state shown in FIG. 3.

In this case, the movement of the damper drive lever 23 is immediately transmitted to the passive lever 29, and the damper 9 is rotated to the ventilation cutoff position together with the passive lever 29, which is rotated clockwise.

As the damper drive lever 23 rotates counterclockwise, the reversing spring 27 exceeds the support pin 24 of the damper drive lever 23 (the state shown in FIG. 3).

Therefore, the reversing spring 27 causes the damper 1 to move due to its tensile force.
A counterclockwise rotating force is applied to the drive lever 23 to hold the damper 9 in the air cutoff position and the cam plate 16 in the upper position.

Due to the holding function of the reversing spring 27, the first solenoid 12 only needs to operate instantaneously to once move the cam plate 16 upward and the damper 9 to the air cutoff position.

In FIG. 3, the ventilation duct 8 is indicated by a dashed line, and a damper 9 is provided at the ventilation port 80 communicating with the cooling fin portion of the magnetron 4.

Therefore, the "air cutoff position" of the damper 9 is the position where the air outlet 80 is closed, and the "air introduction position" is the position where it is opened.

In this way, the first solenoid 12 is seven, the lower heater 2,
3 is provided as a damper drive source that selectively operates during oven heating, and as described above, each time the damper 9 is locked in the air cutoff position during oven heating,
The outside air supplied by the blower fan 7 is discharged from the exhaust port 81 of the blower duct 8 to the outer wall of the re-oven to cool the oven ceiling wall or the outer casing of the microwave oven main body, which is particularly susceptible to temperature rises.

On the other hand, if the damper drive mechanism is in the state shown in Figure 3,
When the second solenoid 13 is energized and operated, the movable element 15 moves downward.

The cam plate 16 is interlocked with the movable element 15 and the pins 18 and 19 are connected to each other.
The damper drive lever 23 is rotated clockwise to switch to the state shown in FIG. 2.

What about the damper drive lever 23 in this case? This is immediately transmitted to the passive lever 29, whereby the damper 9 is rotated together with the passive lever 29, which is rotated counterclockwise, to the ventilation introduction position.

When the damper drive lever 23 is rotated in the clockwise direction, the reversing spring 27 is rotated against the support pin 24 of the damper drive lever 23.
exceeds downward.

This time, the reversing spring 27 applies a clockwise rotational force to the damper drive lever 23 by its tensile force, and moves the cam plate 16 to move the damper 9 to the air introduction position, that is, to the position where the air outlet 80 of the air duct 8 is opened. hold in the downward position.

The damper 9 opposes the flow of outside air supplied by the blower fan 7 and acts as a blowing guide to guide this outside air to the blowing port 80.

Also, similar to the first solenoid 12, the second solenoid 1
3 may be an instantaneous action that only moves the cam plate 16 downward once.

Thereafter, the damper 9 can be held in the air introduction position and the cam plate 16 can be held in the downward position by the holding function of the reversing spring 27.

By the way, as mentioned above, the cam plate 16 is moved upward or downward by the first and second solenoids 12.13, but during the movement, the switch operation part 160 protrudingly formed in the center part moves the base 14. the first fixed at a distance from
actuator 3 of the switch 32 and the second switch 33
20 and 330 are selectively pressed and energized.

Here, the first switch 32 is a normally closed switch connected in series to the first solenoid 12, and the second switch 33 is a normally closed switch connected in series to the second solenoid 13.

The operation of the first and second switches 32 and 33 will be explained in conjunction with the electric circuit shown in FIG.

The food A is stored in the oven interior 1, the door is closed, and the control circuit 34 is selected to select the oven heating method among the two heating methods. In this case, when the cooking switch 35 is closed, the control circuit 34 drives the oven heating relay 36 to close the relay contacts 37 and 38, so the door switch 35 is closed.
A power supply (AC 100V) 40 is connected to the upper heater 2, lower heater 3, and blower fan motor 70 through a series circuit with 9.

As a result, both heaters 2 and 3 generate heat and the inside of the oven 1
and heat food A in sequence.

If the cam plate 16 is now in the solid line position in FIG. 5 as an initial state, the first switch 32 is in the closed state (the second switch 3
3 is in the open state when pressed by the switch operating section 160.

Therefore, when the relay switch 3γ is closed as described above, the first solenoid 12 is energized, the cam plate 16 is moved upward, and the damper 9 is rotated to the air cutoff position. The actuator 320 is pressed by the switch operating portion 160 of the cam plate 16 that has moved, and is immediately switched to the open state.

C, the first solenoid 12 is automatically de-energized as soon as the damper 9 is switched to the air cutoff position.

In this way, the oven interior 1 is sealed and the food A is heated in the oven, but when a predetermined heating time has elapsed, the control circuit 34 shuts off the oven heating relay 36 and opens the relay switch 37, 38 to complete the cooking. becomes.

On the other hand, when the control circuit 34 is selected for high-frequency heating, which is another heating method, the cooking switch 35 is closed, and the control circuit 34 drives the high-frequency heating relay 41 and closes the relay switches 42 and 43. to be accomplished.

As a result, the power supply 40 is connected to the magnetron drive circuit 44, and the magnetron 4 oscillates and outputs a high frequency wave.

At this time, if the cam plate 16 is in the upper position as the initial position, the second switch 33 is in the closed state and the second solenoid 13 is energized.

As described above, the cam plate 16 is moved downward by the operation of the second renoite 13 and the damper 9 is switched to the ventilation introduction position, but the second switch 33 is not connected to the switch operating section 160.
The actuation check 330 is pressed and switched to the open state.

Because of this, the second solenoid 13 is automatically de-energized after the damper 9 is switched to the air introduction position.

As mentioned above, during high-frequency heating, outside air is introduced into the oven chamber 1 and water vapor generated from the food A is discharged from the exhaust port 11. However, after a predetermined heating time has elapsed, the control circuit 34
The high-frequency heating relay 41 is cut off and the relay switches 42 and 43 are opened to complete cooking.

Note that the diode 45 in FIG. 6 is means for supplying direct current to the first and second solenoids 12, 13.

Furthermore, when the control circuit 34 is configured with a sequence control circuit that performs continuous heating using two types of heating methods, such as high-frequency heating in the first stage and oven heating in the second stage, the high-frequency heating relay 41 is first driven and a predetermined heating is performed. After the heating time has elapsed, the oven heating relay 36 can be switched and driven.

In this way, the food A is heated from the inside of the food at high speed by the high-frequency heating in the first stage, and the surface is appropriately browned by the oven heating in the second stage.

Of course, as described above, the damper 9 is automatically switched to each position by the operation of the first and second solenoids 12, 13 to obtain oven conditions suitable for each heating method.

As described above, according to the complex type high-frequency heating device of the present invention, the damper is automatically switched to obtain oven conditions suitable for each heat source (magnetron, heat, gas, etc.), so there is no need for conventional external operation. It is convenient because it eliminates the trouble of switching operations using a lever.

In addition, since the driving solenoid can switch and lock the damper by instantaneous energization, it is possible to provide safety such as no heating of the windings.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram of a microwave oven according to an embodiment of the present invention, Fig. 2 is an external perspective view of its damper drive mechanism, Fig. 3 is a plan view thereof, Fig. 4 is a side view thereof, and Fig. 5 6 is an explanatory diagram of the switch operation, and FIG. 6 is an electric circuit diagram assembled in the microwave oven. 1: Inside the oven, 16: Cam plate, 2, 3: Heater, 2
3: Damper 1 drive lever, 4: Magnetron, 32
, 33: Switch, 8: Air duct, 9: Damper, 12, 13: Solenoid.

Claims (1)

[Claims] 1. In a high-frequency heating device equipped with at least two heat sources including a magnetron, a damper for selectively switching whether to introduce or cut off air from a blower fan into the oven compartment, and a damper for switching the damper to the introduction side when the magnetron is energized. a first solenoid for setting the damper, and a second solenoid for setting the damper to the cutoff side when the other heat source is energized;
a first switch connected in series to the energizing path of the first solenoid; a second switch connected in series to the energizing path of the second solenoid; a cam that opens a first switch to cut off the energization of the first solenoid, and opens the second switch and cuts off the energization of the second solenoid when the second solenoid is activated. heating device.