KR200152119Y1 - Strap combination structure of magnetron - Google Patents

Abstract

The present invention relates to a strap fastening structure of a magnetron, wherein grooves having the same curved surface as the curved surface of the strap 8C are formed in each of the anode vanes of the plurality of anode vanes, and the straps 8C are fastened to the grooves. Since there is no gap between the groove formed in each anode vane and the strap 8C, it is possible to improve the efficiency by suppressing noise generation when the magnetron is driven.

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 firmly fastening a strap to a magnetron anode vane.

In general, the magnetron generates ultra-high frequency by high voltage supplied from the outside, and 2450 is used for medical, microwave, and other heating. Magnetron and industrial heating range that generate high frequency of 915 used for continuous wave radar 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 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 anode 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 the emitted hot electrons from radiating in the direction of the central axis, and the lower part of the lower shield hat 16 is made of molybdenum. The first filament electrode 20, which is a central support of the welding, is welded and fixed to the lower end of the upper shield hat 14 through a through hole formed in the center, 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 outer 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 are formed at both openings of the anode body 6 to form a magnetic path uniformly in the working space 10 between the filament 12 and the anode vane 8. While welded, these upper and lower pole pieces 32, 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 described later is joined 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 joined. 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 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 inside, and the magnetic field generated by the magnets A 2 and K 4 is guided along the lower pole piece 34 toward the working space 10, and the upper pole through the working space 10. 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. 2450, the resonant frequency corresponding to the speed of rotation The high frequency of is induced from the anode vane 8.

Then, the high frequency 2450 induced from the anode vanes 8 ) Is transmitted to the exhaust pipe 44 through the antenna 46, provided to the microwave through a wave guide, and then provided to the cavity of the microwave through a dispersing device so that the molecules of food in the cavity Food is cooked by the frictional heat generated by vibrating about 2.4 billion times per second.

On the other hand, the straps 8C are fastened to 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.

4 is a view illustrating a strap fastening structure of a typical magnetron in the related art. As shown in FIG. 4, grooves formed at right angles to the anode vanes of the plurality of anode vanes 8-1 to 8-8 are illustrated. After the strap 8C is fastened, the anode vane 8 and the strap 8C are welded to each other by soldering with a brazing material such as silver (Ag).

However, since the strap 8C fastened to the groove formed at right angles to the anode vane is a curved surface, a gap is formed between the anode vane and the strap 8C (B in FIG. 4), and noise is generated due to such a gap, resulting in a frequency characteristic. There is a problem of deterioration.

Accordingly, the present invention has been made in view of the above-described problems of the prior art, and provides a magnetron strap fastening structure capable of fastening the strap by forming a groove in the anode vane to have the same curved surface as the curved surface of the strap. The purpose is.

In order to achieve the above object, the present invention, in the strap fastening structure of the magnetron for fastening the strap to the groove formed in the anode vane of the magnetron, forming the groove on the anode vane having a groove having the same curved surface as the curved surface of the strap Provides a strap fastening structure of the magnetron, characterized in that the fastening.

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

2 is a cross-sectional view taken on the basis of AA of FIG.

3 is a view showing a strap fastening structure of the magnetron according to a preferred embodiment of the present invention.

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

* Explanation of symbols for 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: insulating ceramic

20,22 filament electrode 24,26 external connection terminal

28,30: Power end 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 diagram illustrating a strap fastening structure of a magnetron according to a preferred embodiment of the present invention.

Referring to FIG. 3, grooves having the same curved surface as the curved surface of the strap 8C are formed in each of the anode vanes of the plurality of anode vanes 8-1 to 8-8, and the strap 8C is formed in the groove. ) Is fastened.

Therefore, according to the present invention, there is no gap between the grooves formed in each of the plurality of anode vanes 8-1 to 8-8 and the strap 8C, so that the efficiency of the noise can be suppressed during driving of the magnetron to improve efficiency. It works.

Claims (1)

In the strap fastening structure of the magnetron for fastening the strap to the groove formed in the anode vane of the magnetron, the strap fastening of the magnetron, characterized in that to form the groove having the same curved surface as the curved surface of the strap in the anode vane to fasten the strap rescue.