KR19980011794U - Magnetron Strap Fastening Structure - Google Patents

Abstract

The present invention relates to a strap fastening structure of a magnetron, in which a strap 8C fastened to a groove formed in each anode vane of a plurality of anode vanes protrudes from the tip of the anode vane at a predetermined height (for example, 0.2 to 0.5 mm). By fastening as much as possible, the anode vane and the strap 8C can be easily assembled, and the anode vane and the strap 8C are tightly fastened so that the performance of the magnetron can be improved.)

Description

Magnetron Strap Fastening Structure

The present invention relates to a magnetron, and more particularly, to a strap fastening structure of a magnetron suitable for improving adhesion between a magnetron vane and a strap.

In general, magnetron generates ultra-high frequency by high voltage from outside, and it is 915MHz that is used in magnetron, industrial heating range and continuous wave radar that generates high frequency of 2,450MHz for medical, microwave and other heating. It is divided into a magnetron generating high frequency of, the present invention relates to a magnetron used in a microwave oven.

1 is a cross-sectional view showing the structure of a 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 end portions of the plurality of positive electrode vanes 8 and the filaments 12.

In addition, in the working space 10, a filament 12 formed of a mixture of tungsten (W) and oxidized earth (ThO ₂ ) and wound in a spiral shape is arranged coaxially with the positive electrode body 6, and such a filament 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 radiation in the direction of the emitted electron electron central axis, and the center of the lower shield hat 16 is made of molybdenum. The first filament electrode 20, which is a central support, is welded and fixed to the lower end of the upper shield hat 14 through a through hole formed in the center, and the second filament electrode 22 made of molybdenum is formed on the bottom surface of the lower shield hat 16. ) Is fixed by welding.

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 supporting 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 in the working space 10 between the filament 12 and the anode vane 8 are formed at the anode opening of the anode body 6. Although welded, these upper and lower pole pieces 32 and 34 are funnel-shaped magnetic bodies.

The upper and lower shield cups 36 and 38 are adhered to each other by welding to the upper and lower portions of the upper and lower pole pieces 32 and 34, respectively. 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 high frequency oscillated in the cavity resonator, and the antenna 46 is a bipolar 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 welding fixing 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. The antenna ceramic 40 and the 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 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, in 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). The strong electric field is formed, 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) to the upper pole piece through the working space (10) Proceeding to 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 electrons through the dispersing device. It is provided to the cavity of the stove to cook the food by the frictional heat generated by the molecules in the cavity vibrating about 2.4 billion times per second.

Meanwhile, straps 8C are 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.

FIG. 4 is a view illustrating a strap fastening structure of a typical magnetron in the related art, and as shown in FIG. 4, a strap fastened to a groove formed in each of the anode vanes of the plurality of anode vanes 8-1 to 8-8. 8C is inserted and fastened to a predetermined depth (for example, 0.15 mm).

However, since the strap 8C is inserted into a groove formed in each anode vane of the plurality of anode vanes 8-1 to 8-8 with a predetermined depth (0.15 mm) and fastened, the assembly of the anode vane and the strap 8C is difficult. It is difficult and there is a problem that the efficiency of the magnetron is lowered because the anode vane and the strap 8C are not fastened to be in close contact with each other.

Accordingly, the present invention has been made in view of the problems of the prior art as described above, and an object thereof is to provide a strap fastening structure of a magnetron that can be fastened to a strap to have a predetermined height in a groove formed in the anode vane. .

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; 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 strap fastening structure of the magnetron, the strap is provided to the strap fastening structure of the magnetron, characterized in that the fastening so as to protrude with a predetermined height from the front end of the plurality of anode vanes.

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 view illustrating a strap fastening structure of a magnetron according to a preferred embodiment of the present invention

4 is a view illustrating a strap fastening structure of a typical magnetron in the related art

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

2: Magnet A 4: 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 view showing a magnetron strap fastening structure according to a preferred embodiment of the present invention.

As can be seen with reference to FIG. 3, the strap 8C fastened to the groove formed in each of the anode vanes of the plurality of anode vanes 8-1 to 8-8 has a predetermined height (for example, 0.2) from the tip of the anode vane. To 0.5 mm).

Therefore, when the present invention is used, not only the anode vane and the strap 8C can be easily assembled, but the anode vane and the strap 8C are tightly fastened to each other, thereby improving the performance of the magnetron.

Claims (2)

A plurality of anode vanes, each of which is heated by an operating current to emit hot electrons, a cavity resonator, each of which is formed at equal intervals toward a central axis direction, and the plurality of anode vanes are mounted inwardly, and the filament In the strap fastening 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 strap is fastening structure of the magnetron, characterized in that fastening so as to protrude with a predetermined height from the front end of the plurality of anode vanes. The method of claim 1, The predetermined height of the magnetron strap fastening structure, characterized in that 0.2 to 0.5mm.