JPS5830706B2 - Denshirenjino Antenna Souch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an antenna device installed in a microwave oven and radiating microwaves oscillated by a magnetron into the oven.

A microwave oven is a cooking device that dielectrically heats food using 2450 MHz microwaves, but the emitted microwaves create standing waves inside the oven that depend on the wavelength, load condition, oven shape, etc. When food is cooked in the standing waves caused by this, uneven cooking occurs, which significantly impairs the quality of the cooking.

Various efforts have been made to prevent the above-mentioned uneven baking, but recently a magnetron has been devised that minimizes the number of high potential points when feeding microwave power to the oven to make the microwave energy distribution more uniform. There is.

That is, as shown in FIG. 1, in a magnetron 1, a deriving body 2 for deriving microwave energy from an anode cavity resonator is exposed to the outside by penetrating an insulator 4 that seals the cavity resonator in a vacuum. A linear, cross-shaped, or spiral radio wave radiator 3 is attached to the deriving body 2, and microwaves are radiated from the radio wave radiator 3 into the oven.

When radiating microwaves into the oven using the magnetron device described above, compared to simply radiating microwaves into the oven from the derivation body, there are no extremely high potential points at high frequencies, preventing high-frequency discharge and electric fields. The non-uniformity of the distribution can be improved somewhat.

However, even in the magnetron device mentioned above, the radio wave emitter 3 is always fixed at a fixed position, so the microwave radiation conditions do not change and are still insufficient to even out the electric field distribution even remotely. .

The present invention aims to eliminate the drawbacks of the conventional devices described above and uniformly heat food in an oven with a simple configuration.In particular, the magnetron antenna is provided movably to change the apparent volume inside the oven. Alternatively, it is an object of the present invention to provide a device that can change the relative position of an antenna toward an open space.

In FIG. 2, reference numeral 10 denotes an oven having a bottom-shaped metal plate casing, and a magnetron 11 is attached to one wall of the oven, for example, the ceiling wall.

In the magnetron 11, a lead-out member 12 made of a good electrical conductor led out from the anode cavity resonator penetrates an insulator that seals the resonator in vacuum and is exposed to the outside.

The lead-out body 12 has a rod-like shape and a plate-like shape, and a radio wave radiator 14 is attached to the tip of the lead-out body 12 via a flexible connecting body 13.

Reference numeral 15 denotes a holder for fixing the flexible connecting body 13 to the tip of the lead-out body 12, which may be formed integrally with the connecting body 13, or may be screwed using a separate holder. Installation can also be carried out by welding, soldering, etc.

The flexibility of the connecting body 13 is provided to smooth the movement of the radio wave emitter 14 when it periodically moves in the open space, and is constructed using a wire mesh or a plate spring.

The radio wave radiator 14 is made of a good electrical conductor such as copper, aluminum or brass, and for example, as shown in the plan view of FIG.
The top surface shape is approximately similar to that of 0.

That is, when the top surface of the oven is rectangular, the radio wave radiator 14 is designed to be rectangular, and in the case of a cylindrical oven, it is designed to be disk-shaped and attached to the connecting body 13.

Other shapes of the radio wave emitter 14 shown in Fig. 4 at b
, e, it can be formed into a disk shape 14a, a cross shape 14b, or a radial shape 14c.

Next, a mechanism for moving the radio wave emitter 14 within the oven 10 will be explained.

The movement of the radio wave emitter 14 is intended to make the electric field distribution inside the open more uniform, and there is a mechanism that moves the radio wave emitter 14 vertically in parallel to change the oven volume above, and a mechanism that changes the oven volume above. This can be done by a mechanism that changes the microwave radiation conditions by changing the slope of the microwave.

First, as shown in FIG. 2, the mechanism for moving vertically in parallel, as in the former case, involves attaching one or a plurality of operating rods 16 of the same length to the radio wave emitter 14. The end is led out of the oven to form an eccentric ring 17, and the eccentric ring 1
7 is rotatably attached to a crankshaft 18.

The crankshaft 18 is rotated at a constant speed by a motor installed between the oven 10 and the outer casing, converting the operating rod 16 into an up and down reciprocating motion to move the radio wave emitter 14 up and down.

When attaching multiple actuating rods 16 to move up and down,
Each actuating rod 1 is arranged so that the radio wave emitter 14 can move up and down.
6 length and the shape of the crankshaft are taken into consideration.

By vertically moving the radio wave radiator 14 by the above-mentioned mechanism, the radiation conditions for the microwave inside the open are changed, and the food is uniformly heated.

It is not necessary to provide a separate motor for rotating the crankshaft 18, and the floor motor installed in the conventional device can be used by reducing the rotation appropriately.

In contrast to the movable mechanism described above, the latter movable mechanism has at least two positions on the radio wave emitter 14 (for example, approximately 90' or 180' with respect to the attachment of the connecting body 13), as shown in FIG.
Attach the operating rod 26° 26 to a position 26 degrees apart, and lead out the other end of the operating rod 26, 26 to the outside to open the eccentric wheel 27,
Install 27.

The eccentric wheels 27, 27 are pivotally supported by a crankshaft 28, and the rotation of the crankshaft 28 converts the actuating rod 26 into an up and down reciprocating motion.

Here, the two actuating rods 26.degree. 26 are coupled via a crank pin 28a of a crankshaft 28 so as to move in directions opposite to each other in order to tilt the radio wave emitter 14 from the horizontal plane.

Therefore, the plate-shaped radio wave radiator 14 moves by changing its angle of inclination with respect to the top surface of the oven by the rotation of the crankshaft 28, thereby heating the food inside the oven more uniformly.

When the radio wave emitter 14 moves, since the radio wave emitter 14 and the deriving body 12 are connected by the flexible connecting body 13, the movement is carried out naturally and smoothly.

As explained above, in the present invention, a deriving body for deriving microwave energy from the cavity resonance part of a magnetron is installed to protrude into the oven, and a conductive material made of conductive material is attached to the tip of the deriving body in the oven. A flexible connecting body is attached, a radio wave emitter is attached to the flexible connecting body, and the above-mentioned radio wave emitter is provided at at least two positions approximately 90° or 180° apart from the attachment of the connecting body. An operating rod is installed so that the radio wave radiator is inclined from the horizontal plane, and the eccentric wheel is supported by a crankshaft that transmits the rotation of the motor, and the rotation of the crankshaft converts the operating rod into an up and down reciprocating motion, which emits the radio waves. Since we have provided an operating mechanism that moves the radiator by changing its inclination angle with respect to the oven top surface, the plate-shaped radio wave radiator moves by changing its inclination angle with respect to the oven top surface using the same type of crankshaft, and the appearance inside the oven is changed. Since the volume above or the relationship between the radio wave emitter and the oven can be easily and reliably changed, it is possible to uniformly distribute the microwave electric field inside the oven and heat food evenly. Become.

[Brief explanation of drawings]

Fig. 1 is a cutaway sectional view of a main part of a conventional device, Fig. 2 is a side view of an embodiment according to the present invention, Fig. 3 is a plan view of a main part of the same embodiment according to the present invention, and Fig. 4 as by C is a FIG. 5 is a perspective view of a main part of another embodiment according to the present invention, and FIG. 5 is a side view showing another operating mechanism according to the present invention. 10: Oven, 11: Magnetron, 12: Derivative body,
13: Connecting body, 14: Radio wave emitter, 16°26: Operating rod, 17: Eccentric wheel, 18.28: Crankshaft.

Claims (1)

[Claims] 1. A deriving body for deriving microwave energy from the cavity resonant part of the magnetron is installed so as to protrude into the oven,
A flexible connecting body made of a conductive material is attached to the open inner tip of the lead-out body, and a radio wave emitter is attached to the flexible connecting body, and the connection body of the radio wave emitter is approximately attached to the connecting body. 90 degrees is at least 2 points 180 degrees apart
An operating rod is installed at a location to tilt the radio wave emitter from the horizontal plane, the other end of the operating rod is led out of the oven, and an eccentric ring is installed.The eccentric wheel is attached to the crankshaft that transmits the rotation of the motor. A microwave oven characterized by being provided with an operating mechanism that converts the operating rod into an up-and-down reciprocating motion by the rotation of the supported crankshaft and moves the radio wave emitter by changing the inclination angle with respect to the upper surface of the oven. antenna device.