JPS6019355Y2 - microwave heating device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a microwave heating device that combines a magnetron and a microwave oven.

Microwave ovens (microwave heating devices, which are now widely used in general households) are being made smaller and lighter, and the structure of the magnetron has been to incorporate a small high-performance magnet into a vacuum container made of ferromagnetic material. In practical use, a radiator is placed inside the container and a radiator is fixed to the outer periphery of the container.

This has a simple appearance and shape and is lightweight.

However, this magnetron is generally used in a structure in which it is connected to an oven using a waveguide, and the reality is that its advantages of being small and lightweight are not fully utilized.

This idea was made in view of the above circumstances, and cleverly utilizes the radiator fins of the magnetron and the oven wall to form a shield box that houses the filter element and cathode stem when these are combined. However, the present invention provides a microwave heating device with a simplified structure.

Embodiments of this invention will be described below with reference to the drawings.

Identical parts are designated by the same reference numerals. Figures 1 to 3
The embodiment shown in the figure has the following configuration.

That is, a table 13 is provided at the bottom of the box-shaped microwave oven 11 on which an object to be heated 12 is placed, a door 14 is formed on the side surface, and a recess 15 is formed in the ceiling, in which a magnetron 16 is housed. It will be set up.

The magnetron 16 has an anode vane 22 made of copper, an anode cylinder 23 or a resonant cavity element, a cathode 24, and a pair of cylindrical permanent magnets 25 inside a cylindrical vacuum vessel 21 made of a ferromagnetic material such as iron. .26 is installed.

The vacuum container 21 is closely fixed to the outer periphery of the anode cylinder 23 and is electrically and thermally connected integrally therewith.

An output antenna 27 is protruded from one end of the container 21, a cathode stem 28 is protruded from the other end, and a large number of cathode stems 28 are stacked on the outer periphery of the container at intervals from near the antenna to near the stem. radiator fins 29 are fixed by press fitting.

The radiator fins 29 have a rectangular outer shape, are made of aluminum, copper, iron, galvanized iron, or other heat conductor and conductive material, and are bonded to each other so that they have the same potential as the container and the anode cylinder. .

One side of the radiator fin 29a that is closest to the cathode stem extends parallel to the tube axis, and this extended portion 29b has a large number of ventilation and fixing holes with radio wave blocking dimensions. 29c is drilled.

The microwave oven 11 is likewise formed of a conductive material,
The ceiling wall itself is press-molded to form a concave or recessed portion 15 at a portion of the ceiling wall 11a opposite to the position where the object to be heated 12 is placed.
is formed.

A through-type capacitor 31 is attached to the side wall of the recess 15, and a connecting terminal 32 is protruded from the outside, and a lead wire 3 connected to the capacitor 31 is provided inside the recess.
3 and an inductor 34 are connected to each other.

In addition, the bottom wall 15a of the recess has a large number of ventilation holes 3 with radio wave blocking dimensions.
5 is bored and a cooling fan is provided on the outside.

Therefore, the magnetron 16 is accommodated and fixed within this recess 15.

In this case, the radiator fins 29 of the magnetron are fixed to the three wall surfaces of the recess 15 with screws 37 while maintaining electromagnetic airtightness.

This allows the radiator fin 29 next to the output antenna to
d and the recess walls 15a, 15b, 15C, the antenna 2
A rectangular waveguide cavity is formed for high-frequency coupling between 7 and the space inside the oven, and each dimension is selected so that the length 1 is approximately 4/1 wavelength (electrical length).

Also, the radiator fin 29a and the recess wall 15 on the side of the stem
a, 15c, and 15d form a shield box in which the stem 28 and filter element are housed.

In this way, the magnetron 16 is virtually accommodated in the oven interior space, and its radiator fins and oven walls form a shield box.

This invention has the above structure, and since the radiator fins of the magnetron and the oven wall constitute a shield box that surrounds the stem, the magnetron itself can have an extremely simple exterior structure.

This is particularly advantageous when using a magnetron that does not have extra parts such as magnets or magnetic frames outside the radiator fins.

Since the radiator of the magnetron and the oven wall are skillfully utilized in this way, there are advantages of simplifying the entire apparatus and effectively utilizing the internal space of the oven.

In addition, in order to assemble the magnetron as in the present invention, a tube consisting of a vacuum container without radiator fins or a shield box, a radiator fin, and an oven wall are each prepared as a magnetron, and a manufacturer of microwave heating equipment, for example, prepares the magnetron. It is also possible to appropriately assemble the parts according to the forming shape of the parts, thereby eliminating design constraints.

The embodiment shown in FIGS. 4 and 5 has the following configuration in accordance with a preferred assembly order.

First, a magnetron tube 1 having a structure similar to that of the embodiment described above.
Prepare 6.

On the other hand, a plurality of radiator fins 29 are prepared in advance from a heat conductive material such as aluminum, and are laminated and fixed to the outer periphery of the bulb 16 by press-fitting.

Similarly, a box 41 is made by forming a plate material with good thermal and electrical conductivity such as aluminum into a box shape, and a bent flange 42 of a size that can fit around the outer circumference of the tube is provided at the center of the bottom of the box 41.

A band 44 that can be tightened with screws 43 is fitted onto the outer periphery of this flange 42 .

An inductor 34 and a through-type capacitor 31 are embedded and fixed in the opening of the box 41 with resin 45, and a large number of ventilation holes 46 having radio wave blocking dimensions are bored in the outer peripheral wall next to the flange 42.

This box 41 is installed in advance on the ceiling wall 11a of the oven.
Screw it directly or through a gasket to prevent radio wave leakage.

Then, the tube formed by press-fitting the radiator fins as described above is inserted into the flange 42 of the box, and is fixed by tightening the band 44.

In this case, an electrically conductive and heat conductive adhesive may be interposed between the outer circumferential wall of the bulb and the inner surface of the flange.

In this way, the magnetron is fixed so as to protrude into the space inside the oven, and the cathode connection terminal 32 is provided so as to protrude outside the oven.

In this embodiment as well, the box wall that also serves as a radiator fin and the oven wall constitute a shield box that surrounds the magnetron cathode stem and filter element, allowing effective use of each component and simplifying assembly.

With this structure, the magnetron can be attached to a relatively arbitrary position in the oven, which is even more convenient.

The shield box and the magnetron tube can be fastened to and removed from each other by means of a band, and even if the tube is defective, it can be easily replaced.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram showing one embodiment of this invention, Fig. 2 is a cross-sectional view of the main part thereof, Fig. 3 is an exploded perspective view of the one in Fig. 2, and Fig. 4 is another example of this invention. FIG. 5 is an exploded view of the main part of the embodiment. 16...Magnetron, 21...Vacuum vessel, 27...Antenna, 28...Stem, 29...Radiator fin, 11...・
...Oven, lla, 153-d...Oven wall, 33...Lead wire, 31.34...
...filter element.

Claims (3)

[Scope of utility model registration request] (1) It has a vacuum container with a built-in resonant cavity and a protruding cathode stem, a magnetron with radiator fins fixed to the outer periphery of this vacuum container, and a microwave oven in which this magnetron is installed. In this microwave heating device, a shield box is constructed in which the radiator fins on the cathode stem side are connected to the oven wall, and the cathode stem is surrounded by these radiator fins and the oven wall, and the cathode lead wire is installed in this box. and a microwave heating device containing a filter element connected to the lead wire. (2) The microwave heating device according to claim 1, wherein the radiator fins forming the shield box together with the oven wall are connected to the outer periphery of the vacuum chamber of the magnetron by detachable fixing means. (3) Request for registration of a utility model in which a recess is formed in the inner wall of the oven, a magnetron is housed in the recess, and the radiator fins of the magnetron partition a part of the space inside the recess to form a shield box. range 1
Microwave heating device as described in .