KR19980011289U - Magnetron bipolar vane structure - Google Patents

Abstract

The present invention relates to the structure of the anode vane of the magnetron, and when a current is alternately provided from one anode vane of the plurality of anode vanes to another neighboring anode vane, the strap formed at the lower portion of the anode vane from the center axis of the magnetron Since the center diameter is wider than the center diameter of the strap formed on the upper part of the anode vane, a better oscillation tube is formed, so that the generation of noise can be suppressed while driving the magnetron to improve the efficiency.

Description

Magnetron bipolar vane structure

The present invention relates to a magnetron. In particular, the center radius of the strap formed at the bottom of the magnetron anode vane is wider than the center radius of the strap formed at the upper portion of the anode vane, thereby reducing noise and improving efficiency. It relates to a bipolar vane structure of a magnetron suitable for being present.

In general, magnetron generates ultra-high frequency by high voltage from outside, and it is high-frequency of 915MHz that is used for magnetron that generates high frequency of 2450MHz used for medical, microwave, and other heating, industrial heating range, continuous wave radar. It is divided into a magnetron generating a, the present invention relates to a magnetron used in a microwave oven.

On the other hand, Figure 1 is a cross-sectional view showing the structure of a conventional conventional magnetron.

As can be seen from the same figure, a plurality of (generally even) anode vanes 8 which form a cavity resonator to induce high frequency components inside the anode body 6 formed in a cylindrical shape by copper pipes or the like. It is arrange | positioned at equal intervals toward this axial direction, and the anode part is comprised by such a cathode body 6 and the anode vane 8.

In order to change the capacitance to obtain a uniform resonant frequency, inner and outer equalization rings 8a and 8b are alternately connected to the anode vanes 8 at upper and lower ends thereof, respectively, on the tip side of the anode vanes 8, respectively. On the central axis of the positive electrode body 6, a working space 10 is formed between the front ends of the plurality of positive electrode vanes 8 and the filaments 12.

In the working space 10, a filament 12 formed of a mixture of tungsten (W) and thorium oxide (ThO ₂ ) and wound in a spiral shape is disposed coaxially with the positive electrode body 6. 12 is heated by an operating current provided from the outside to emit hot electrons.

On the other hand, the upper and lower shield hats 14 and 16 are fixed to both ends of the filament 12 to prevent radiated hot electrons from radiating in the central axis direction, and the lower shield hat 16 is made of molybdenum. The first filament electrode 20, which is a central support of the welding, is welded to the lower end of the upper shield hat 14 through a through hole formed in the center thereof, and a second filament electrode made of molybdenum is formed on the bottom surface of the lower shield hat 16. 22) is welded.

Here, the first and second external filament electrodes 20 and 22 are connected to the power supply terminals 28 and 30 through through holes formed in the insulating ceramic 18 for holding the cathode of the magnetron. A cathode support is electrically connected to the connection terminals 24 and 26 to supply current to the filament 12. The first filament electrode 20 supports the upper shield hat 14 while passing through the central axis of the filament 12. do.

In addition, upper and lower pole pieces 32 and 34 which form a magnetic path at both openings of the anode body 6 to uniformly form magnetic flux in the working space 10 between the filament 12 and the anode vane 8 are provided. Although welded, these upper and lower pole pieces 32 and 34 are funnel-shaped magnetic bodies.

In addition, upper and lower shield cups 36 and 38 are attached to the upper and lower portions of the upper and lower pole pieces 32 and 34, respectively, and are welded to each other. In order to seal the inside of 6) in a vacuum state, the antenna ceramic 40 and the insulating ceramic 18 are brought into close contact with each other and welded together.

In addition, a cylindrical antenna ceramic 40 for insulating the antenna cap 42 to be described later is bonded to the upper opening end of the upper shield cup 36 constituting the output portion of the magnetron, and an upper end portion of the antenna ceramic 40 is connected. The exhaust pipe 44, which is a copper material, is joined to the inner central portion of the exhaust pipe 44, and an antenna 46 is provided to output the high frequency oscillated in the cavity resonator, and the antenna 46 is the anode vane 8 The end portion is fixed in the exhaust pipe 44 while penetrating through the central portion of the upper pole piece 32 and extending axially.

In addition, the outer surface of the exhaust pipe 44 protects the welded portion of the exhaust pipe 44, prevents sparks generated by electric field concentration, serves as a high frequency antenna, and serves as a window for outputting high frequency to the outside. An antenna ceramic 40 and an antenna cap 42 are covered.

The operation process of the magnetron made of the above-described members is as follows.

First, when an external power source is provided to the first and second external connection terminals 24 and 26 through the power terminals 28 and 30, the first external connection terminal 24, the first filament electrode 20, and the upper shield are provided. A closed circuit composed of the hat 14, the filament 12, the lower shield hat 16, the second filament electrode 22, and the second external connection terminal 26 is configured to supply an operating current to the filament 12.

Then, the filament 12 is heated by the operating current provided to the filament 12 to emit hot electrons from the filament 12, thereby forming an electron group by the released hot electrons.

At this time, the working space 10 between the filament 12 and the anode vane 8 by the driving voltage applied to the second filament electrode 22 and the anode portion (that is, the anode body 6 and the anode vane 8). A strong electric field is formed therein, and the magnetic field generated by the magnet A 2 and the magnet K 4 is guided along the lower pole piece 34 toward the working space 10, through the working space 10 to the upper pole. Proceeding to the piece 32, a high magnetic field is formed in the working space 10.

Therefore, the electron group formed by the hot electrons emitted from the filament 12 into the working space 10 is formed by the strong electric field and the high magnetic field formed in the working space 10, and thus the anode portion (the anode body 6 and the anode vane 8). It proceeds in a spiral rotational motion in the direction of), and this movement of the electron group is performed in all spaces of the working space 10.

Accordingly, the electron group formed of hot electrons is repeatedly moved toward the anode portion (the anode body 6 and the anode vane 8) according to the structural resonance circuit between the anode vane 8 and the cavity resonator. A high frequency of 2450 MHz, which is a resonance frequency corresponding to the speed of rotation, is induced from the anode vanes 8.

Then, the high frequency (2450 MHz) induced from the anode vanes 8 is transmitted to the exhaust pipe 44 through the antenna 46, provided to the microwave through the wave guide, and then through the dispersion apparatus. The food is cooked by the frictional heat generated when the food molecules in the cavity vibrate about 2.4 billion times per second.

FIG. 2 is a cross-sectional view taken along line AA of FIG. 1, and FIG. 4 is a cross-sectional view taken along line BB of FIG. 2.

As can be seen with reference to Figs. 2 and 4, the anode vane structure of a typical typical magnetron is formed such that the anode body 6 is formed in a cylindrical shape, and the anode body 6 and the cathode have an equal interval toward the central axis direction. It is comprised by the some anode vanes 8-1-8-8 arrange | positioned and inducing high frequency.

A strap 8C is formed on the upper and lower portions of the plurality of anode vanes 8-1 to 8-8 to form the same potential between the plurality of anode vanes.

As shown in Figs. 2 and 4, the conventional anode vane structure of a typical magnetron is a distance between the straps 8C formed on top of the plurality of anode vanes 8-1 to 8-8 from the central axis of the magnetron. R1 and R2 are formed to have the same distance as the distances R1 and R2 between the straps 8C formed on the lower portions of the plurality of anode vanes 8-1 to 8-8 from the central axis of the magnetron.

On the other hand, the present invention is formed of a magnetron that can reduce the noise and at the same time improve efficiency by forming a central radius of the strap (8C) formed on the lower portion of the anode vane wider than the central radius of the strap (8C) formed on the anode vane The purpose is to provide a bipolar vane structure.

In order to achieve the above object, the present invention provides a filament that is heated by an operating current to emit hot electrons, a plurality of anode vanes each formed at equal intervals toward the center axis direction, and forming a cavity resonator, and the plurality of anodes. A vane is mounted to the inside thereof, and includes a positive electrode body surrounding the filament and the plurality of anode vanes outwardly, and a strap for fastening the upper and lower portions of the plurality of anode vanes to form the same potential between the anode vanes. In the anode vane structure of the magnetron, the distance between the straps formed on the lower portion of the plurality of anode vanes from the central axis of the magnetron is relatively wider than the distance between the straps formed on the plurality of anode vanes on the central axis. The anode vane structure of the magnetron is provided.

1 shows a cross-sectional view of a typical typical magnetron,

FIG. 2 is a cross-sectional view taken along line AA of FIG. 1;

3 is a cross-sectional view taken on the basis of BB of FIG. 2, illustrating a bipolar vane structure of a magnetron according to a preferred embodiment of the present invention;

FIG. 4 is a cross-sectional view taken along line BB of FIG. 2 and illustrates a bipolar vane structure of a typical magnetron.

* Description of the symbols for the main parts of the drawings *

2: Magnet A4: Magnet K

6: anode body 8: anode vane

10: working space 12: filament

(14, 16): Shield Hat 18: Insulated Ceramic

(20, 22): filament electrode (24, 26): external connection terminal

(28, 30): Power stage (32, 34): Pole piece

(36, 38): Shield Cup 40: Antenna Ceramic

42: antenna cap 44: exhaust pipe

46: antenna

The above and other objects and various advantages of the present invention will become more apparent through the preferred embodiments of the present invention described below with reference to the accompanying drawings by those skilled in the art.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a cross-sectional view taken on the basis of BB of FIG. 2 and illustrates a bipolar vane structure of a magnetron according to a preferred embodiment of the present invention.

As can be seen with reference to FIG. 3, the distances R3 and R4 between the straps 8C formed on the lower portions of the plurality of anode vanes 8-1 to 8-8 from the central axis of the magnetron are plural from the central axis of the magnetron. It is formed wider than the distance (R1, R2) between the strap (8C) formed on the top of the two anode vanes (8-1 to 8-8).

That is, when a current is alternately provided from one of the plurality of anode vanes 8-1 to 8-8 to another neighboring anode vane, a strap formed below the anode vane from the center axis of the magnetron ( Since the center diameter of 8C) is wider than the center diameter of the strap 8C formed on the upper part of the anode vane, a better oscillation tube is formed.

Therefore, by using the present invention, there is an effect that the efficiency of noise can be improved by suppressing the generation of noise during the driving of the magnetron.

Claims (1)

A plurality of anode vanes, each of which is heated by an operating current to emit hot electrons, and forms a cavity resonator, each of which is formed at equal intervals toward the center axis direction, and the plurality of anode vanes are mounted therein; In the anode vane structure of the magnetron consisting of a positive electrode body surrounding the plurality of anode vanes to the outside, and a strap for fastening the upper and lower portions of the plurality of anode vanes to form the same potential between the anode vanes, The distance between the straps formed on the lower portion of the plurality of anode vanes from the central axis of the magnetron, the distance between the straps formed on the upper portion of the plurality of anode vanes in the central axis is relatively large, the anode vane structure.