JPS5818563Y2 - High frequency heating device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a high-frequency heating device, and particularly to a door opening/closing device thereof.

Doors in conventional high-frequency heating devices are manually opened and closed, and some devices are operated mechanically, but this simply opens the door.

When closing a door manually, if the force applied is strong, the inner panel of the door and the front panel of the device that comes into contact with it may be subjected to impact, causing deformation and damage.If the force applied is weak, the door should not be activated when the door is closed. There was an inconvenience that the switch sometimes did not work and the door had to be closed again.

In view of the above-mentioned points, the present invention combines a driving means for opening and closing the door, an operating rod that can be operated to drive a motor, and three switches, so that the door can be opened mechanically by simply operating the operating rod. It is possible to perform complete reciprocating operation from fully closed to fully open, and one of the switches mentioned above can also be used as a magnetron switch to detect when the door is completely closed and activate the magnetron. To provide a high frequency heating device that can

There is a particular thing. Hereinafter, embodiments of the high frequency heating device of the present invention will be described with reference to FIGS. 1 to 5.

FIG. 1 is a schematic front view of the main parts of the door opening/closing device. A door 1 is provided in a single-opening manner with respect to the device main body 2, and an arm 3 is provided at the opening/closing end of the door 1 and extends into the device main body 2. An intermediate gear 6 meshes with a rack 5 which is pivotally connected by a pin 4 and carved on one side of this arm 3, and the intermediate gear 6 is connected to an output shaft 7 of a motor 7.
It meshes with gear 8 attached to A.

The arm 3 is provided with a linear slit 9, and the arm 3 is guided by a guide pin 10 provided in the device main body 2, which is inserted into this slit 9, so that the motor 7
When the motor 7 is driven in the normal direction, the door 1 is opened via the gear 8, the intermediate gear 6, and the arm 3, and when the motor 7 is driven in the reverse direction, the door 1 is closed.

Fig. 2 shows another main structure of the opening/closing end of the door of the door opening/closing device, and the hook 11 is a lock piece on the door 1 side, and is not intended to engage with the lock 12 in the locked state. At this time, it is opened so as to escape from the lock 12 against the bias of a spring (not shown).

The lock 12 is a lock piece on the side of the main body 2 of the device, and is pivoted by a pin 13. Even when the hook 11 is in the locked position, when the operating rod 14, which is provided in a push-pull type, is pulled forward, a spring 15 is activated to lock the pin 13. It is admonished to descend with the center of rotation at .

The magnetron switch 16, which is engaged with the hook 11, is fixed integrally with the lock 12, and when it engages with the hook 11, it detects that the door 1 is completely closed, and the oscillation coil of the magnetron is energized. It is so that it can be done.

A door switch 17 is provided to engage with the operating rod 14 in the pushed-in state, and when this door switch 17 is pushed by the operating rod 14, it can drive the motor 7 in the forward rotation, and when the operating rod 14 is released, the motor 7 can be driven. It is possible to drive the motor in reverse.

FIG. 3 is an enlarged perspective view of the main part corresponding to FIG. When opened, the actuating piece 18A is pushed by the arm 3 to stop the normal rotation of the motor 7.

In the above case, the door 1 can be stopped at the required opening degree by adjusting the mounting position of the sensing switch 18.

Due to the above-mentioned configuration, the motor 7 must be one that alternately rotates forward and reverse each time the current is intermittently supplied.

However, when the arm 3 is expanded as shown in FIG.
If a U-shaped slit corresponding to the swinging movement of the arm is formed on the outside of the slit 9, and an endless tooth profile is carved into this slit, and a mangle gear structure in which the gear 19 is meshed with this slit, energization can be made intermittently. It is possible to use a motor that always rotates in the normal direction.

FIG. 5 shows an electric circuit diagram of the door opening/closing device of the high frequency heating device of the present invention, and this circuit partially utilizes a magnetron oscillation circuit.

The oscillation coil 20 of the magnetron and the motor 7 for opening and closing the door are connected in parallel, and the door opening/closing switch 17 is a changeover switch, and the contact is changed by the operation lever 14.The magnetron switch 16 is a changeover switch. The operating rod 14 is used to switch to the B contact, and the hook 11 is used to switch to the A contact.The sensing switch 18 is a normally closed switch and is turned off by the arm 3.

Next, the operation of the door opening/closing device in the high-frequency heating device configured as described above will be explained with reference to FIG. 5.

In Figure 5, all three switches are in A contact,
This state shows that the door 1 is closed and current is being applied to the oscillation coil 20 of the magnetron.

To open the door 1 from the hanging state, it is sufficient to simply pull the operating rod 14 shown in FIG. 2 toward you.

Then, the door opening/closing switch 17 switches to the B contact, and with a delay, the lock 12 lowers and becomes unlocked, and the magnetron switch 16 also switches to the B contact.

Therefore, the current does not flow to the oscillation coil 20 but to the motor 7, and the motor 7 is driven to rotate in the normal direction, causing the door 1 to open.

When the door 1 opens to the maximum or near the maximum, the arm 3 turns off the A contact of the sensing switch 18, the motor 7 stops driving, and the door 1 also stops at that position.

To close the door 1, it is sufficient to simply push in the operating rod 14.

Then, the door opening/closing switch 17 switches to the A contact, the lock 12 is lifted to the locked position, and the magnetron switch 16 is also lifted together with the lock 12, but since the door 1 is not closed, the magnetron switch 16 enters the B contact. Therefore, when the motor 7 is driven in the reverse direction, the door 1 is closed.

When the door 1 is closed and the hook 11 is fully engaged with the lock 12, the magnetron switch 16 is pushed by the hook 11 and switched to the A contact.

Then, the current does not flow to the motor 7 but to the oscillation coil 20, and the motor 7 stops driving, so that the door 1 stops in a completely closed state.

Although not included in the gist of the present invention, improvements have also been made to the mounting structure of the heater installed in the oven, which will also be described.

The heater mounting structure of the conventional high-frequency heating device with heater is as follows.
As shown in FIG. 6, both ends of the U-shaped heater 21 are hermetically surrounded by a rear box 23 insulated by a glass 30 provided protruding from the rear wall 22 of the oven, and a high frequency leakage prevention pipe 24 provided in the box 23 is connected to the rear box 23. The lead wire 25 is guided into the box 23, and the round terminal 25A is connected to the heater 21, and the middle part of the heater 21 is supported by a heater receiver 26 from the rear wall of the oven. If steam is introduced into the box 23, the steam will enter the box 23 and the insulation of the heater power supply section will not be maintained, and the user may accidentally pull the heater 21 forward for purposes such as cleaning, which may damage the heater power supply section. , causing sparks.

For this reason, improvements made to the mounting structure of the heater were as shown in FIG. 27 is housed so that its small diameter portion protrudes from the oven rear wall 22, and the seal body 2
A U-shaped heater 21 is housed inside the oven rear wall 2.
A nut 28 is attached to the male screw portion at both ends of the heater 21 protruding from the heater 21, a Teflon support member 29 equipped with a gasket, and a lead wire 2.
Attach the round terminals 25A and 30 in order by supporting the heater 21 elastically with the supporting material 29, and ensuring that the heater holder 26 is placed in the middle of the heater 21 from the door side. This allows the heater power supply section to be sufficiently insulated even when steam is put into the oven, and also prevents the user from pulling out the heater 21 toward the user.

As explained above, the high-frequency heating device of the present invention combines a drive device for opening and closing the door, an operating lever for operating the drive device, and three switches to open and close the door from the closed state. It has a configuration that allows the operation to be performed until it is fully closed and from the open state, and one of the three switches mentioned above is also used as a magnetron switch that opens and closes the magnetron's oscillation circuit by using a changeover switch. With this structure, the door can be mechanically opened and closed using only the operating lever, and the oscillation coil can be energized by detecting that the door is completely closed, so that the desired purpose can be achieved at low cost.

[Brief explanation of the drawing]

Figures 1 to 5 relate to an embodiment of the present invention, in which Figure 1 is a schematic front view of main parts of a door opening/closing device of a high-frequency heating device, Figure 2 is a front view of another main part of the same as above, and Figure 3 is a front view of another main part of the same. is an enlarged perspective view corresponding to FIG. 1, FIG. 4 is a front view of the main part for explaining the modification, FIG. 5 is a circuit diagram of the main part of the door opening and closing device, and FIG. 6 is a diagram of the conventional high-frequency heating device Explanatory Front View of Heater Mounting Structure FIG. 7 is an explanatory front view of the heater mounting structure in the high-frequency heating device according to the embodiment of the present invention. 1...Door, 2...Device body, 3,5.
8... Drive device (3... arm, 5...
...Rack, 6,8...Gear, 7...
... motor), 11 ... hook, 12 ...
...Lock, 14...Operation lever, 15...
... Spring, 16 ... Magnetron switch, 17 ... Door opening/closing switch, 18 ...
Sensing switch.

Claims (1)

[Scope of utility model registration request] A necessary drive device for opening and closing the door, a lock as a lock piece on the device body side that is movable by a spring from a locked position where it engages with a hook as a lock piece on the door side to an unlocked position when the door is closed;
The magnetron switch is movably mounted with a spring so as to be released from the locking state with the hook, and detects when the door is completely closed and energizes the magnetron's oscillating coil. An operating rod that can be operated to move the lock to the unlocked position and the magnetron switch to a position away from the hook, and the door is operated to close from the open state and open from the closed state by operating the operating rod. The door opening/closing device includes a door drive switch that drives the drive device to operate, and a detection switch that stops the drive device when the door detects that the door is at the maximum or near the maximum. High frequency heating equipment.