KR20030089310A - Exhaust pipe structure for magnetron - Google Patents

Abstract

PURPOSE: An evacuating pipe structure is provided to prevent damages of the brazed portion between the ceramic and evacuating pipe during the evacuating pipe cutting process. CONSTITUTION: A magnetron has an evacuating pipe(19) mounted on the output unit for outputting a high frequency energy, wherein the evacuating pipe prevents a leakage of the high frequency noise. The evacuating pipe has a groove(100) formed at the outer surface of the evacuating pipe so as to cut off the force being applied to the brazed portion during the evacuating pipe cutting process.

Description

Exhaust pipe structure of magnetron {EXHAUST PIPE STRUCTURE FOR MAGNETRON}

The present invention relates to the exhaust pipe structure of the magnetron, and more particularly to the exhaust pipe structure of the magnetron to prevent the cracks generated in the junction of the A-ceramic and the exhaust pipe when cutting the upper end of the exhaust pipe.

As is generally known, a magnetron is a device installed in a microwave oven or a lighting device to convert electrical energy into high frequency energy such as microwaves.

A magnetron of a conventional general structure is illustrated in FIG. 1, which will be briefly described as follows.

As shown in the figure, inside the yoke 1 where the upper yoke 1a and the lower yoke 1b are combined to have a substantially ". &Quot; shape, an anode cylinder 2 made of a cylindrical shape using a copper pipe or the like is provided. In the anode cylinder 2, a plurality of vanes 3 which form a cavity resonator so as to induce high frequency components are arranged at equal intervals in the axial direction, and at the tip end side of the vane 3 The upper and lower portions of the inner pressure equalizing ring 4 and the outer pressure equalizing ring 5 are coupled so as to be alternately connected, so that the anode cylinder 2 and the vane 3 form an anode portion.

In addition, on the central axis of the anode cylinder (2) is provided a filament (7) spirally wound so that the front end of the vane (3) and the working space 6 of a predetermined interval is formed, the filament (7) is tungsten It is made of a mixture of thorium oxide, so that the cathode portion is heated by the supplied operating current to emit hot electrons.

In addition, the top shield 8 is fixed to the upper end of the filament 7 to block the emitted hot electrons from radiating upward, and the end shield to prevent the radiated hot electrons from radiating downward. (9) is fixed to the through hole formed in the center portion of the end shield (9) is inserted into the center lead 10 made of molybdenum and fixed to the lower surface of the top shield (8), the center lead on the lower surface The upper end of the side lead 11 made of molybdenum material is installed at a predetermined interval from the 10 and is fixed.

In addition, the upper and lower openings of the anode cylinder 2 are coupled with a funnel-shaped box pole 13 made of a magnetic material and a defect pole 14, and an upper side and a defect pole 14 of the box pole 13. The lower side of the cylindrical A-chamber 15 and the F-chamber 16 are brazed, respectively, the upper side of the A-chamber 15 and the lower side of the F-chamber 16 output high frequency to the outside. The A-ceramic 17 and the F-ceramic 18 for insulation are brazed, and the exhaust pipe 19 is brazed to the upper side of the A-ceramic 17, and the exhaust pipe 19 The upper end of is joined at the same time as cutting to seal the inside of the anode cylinder 2 in a vacuum state.

In addition, inside the A-chamber 15, an antenna 20 for outputting high frequency oscillated in the cavity resonator is installed. The lower end of the antenna 20 is connected to the vane 3, and the upper end is It is fixed to the inner upper surface of the exhaust pipe 19.

In addition, the upper magnet 21 and the lower magnet 22 are coupled to the upper side and the lower side of the anode cylinder 2 so as to be in contact with the inner surface of the yoke 1, so that the upper and lower poles 13 and 14 are connected. It is to be able to form a gyros with.

In addition, a box-shaped filter box 26 is coupled to the lower side of the yoke 1, and a pair of choke coils 27 for attenuating harmonic noise flowing back to the input part inside the filter box 26. Although one end of the pair of choke coils 27 is provided, the one end of the pair of choke coils 27 is electrically connected to the lower end of the pair of F-leads 28 which are coupled to be inserted into the through holes formed in the F-ceramic 18. .

The upper ends of the F-leads 28 inserted into the through-holes of the F-ceramic 18 are respectively bonded to the lower surfaces of the pair of disks 29 provided above the F-ceramic 18. Upper ends of the discs 29 are joined to lower ends of the center leads 10 and the side leads 11, respectively.

In addition, a capacitor 31 is provided on the side wall of the filter box 26, and an inner end of the capacitor 31 is electrically connected to the choke coil 27, and the choke coil 27 has a low frequency. Ferrites 32 for absorbing noise are inserted in the longitudinal direction.

Meanwhile, a cooling fin 41 is provided between the inner circumferential surface of the yoke 1 and the outer circumferential surface of the anode cylinder 2, and the joint of the exhaust pipe 19 is protected on the upper side of the A-ceramic 17. The antenna cap 42 is covered.

In the general magnetron constructed as described above, the external power is supplied to the center lead 10 and the side lead 11 through the F-lead 28, and the F-lead 28, the center lead 10, and the filament 7 ), A closed circuit consisting of the top shield 8, the end shield 9, the side lid 11, and the disk 29 is configured so that the operating current is supplied to the filament 7, and the operating current supplied as such As a result, the filament 7 is heated to emit hot electrons, and electron groups are formed by the emitted hot electrons.

In addition, a strong electric field is formed in the working space 6 due to the driving voltage supplied to the anode portion through the side lead 11, and the magnetic flux generated by the upper magnet 21 and the lower magnet 22 is defective. Guided along (14) toward the working space (6), a high magnetic field is formed in the working space (6) while proceeding through the working space (6) to the box electrode (13).

Therefore, the hot electrons emitted from the surface of the hot filament 7 into the working space 6 travel to the vane 3 by the strong electric field present in the working space 6, and at the same time, the force is applied vertically by the strong magnetic field. It will receive the vane (3) in a circular motion in a spiral.

The group of electrons formed by the movement of the electrons interferes with the vanes 3 at intervals equal to the reciprocal of the multiple of the periodic high frequency oscillation frequency, and by this action, the vanes 3 face each other, that is, the resonator. The capacitance component of the capacitance acting between the visible vanes 3 and the inductance component composed of the opposing vanes 3 and the anode cylinder 2 connecting them constitute a parallel resonant circuit on the circuit so that the resonance frequency is increased. The high frequency is determined by the vane (3) is induced from the vane (3), and the induced high frequency is radiated out through the antenna 20, the food is cooked by the frictional heat generated by vibrating the molecules of the food 2.4 billion times per second do.

However, in the conventional magnetron structured as described above, when the upper end of the exhaust pipe 19 is joined at the same time as the upper end of the exhaust pipe 19, a force is applied to the brazing joint with the A-ceramic 17 to generate a crack. However, there is a problem that the internal vacuum is destroyed by the crack generated as described above, resulting in poor quality.

SUMMARY OF THE INVENTION An object of the present invention devised in view of the above problems is to provide a magnetron exhaust pipe structure suitable for preventing breakage of the brazing joint from occurring when cutting the exhaust pipe so as to prevent quality defects from occurring.

1 is a longitudinal sectional view showing a structure of a conventional magnetron.

Figure 2 is a cross-sectional view showing a cutting process of the conventional exhaust pipe.

Figure 3 is a longitudinal sectional view showing a magnetron having an exhaust pipe structure of the present invention.

Figure 4 is a longitudinal cross-sectional view showing a state in which the exhaust pipe of the present invention is bonded to the A-ceramic.

Figure 5 is a longitudinal cross-sectional view showing the operation of cutting the exhaust pipe of the present invention.

Explanation of symbols on the main parts of the drawings

19: exhaust pipe 100: power transmission blocking groove

In order to achieve the object of the present invention as described above

In the magnetron is provided with an exhaust pipe for blocking the leakage of harmonic noise at the output portion of the high frequency energy output,

It is formed on the outer circumferential surface of the exhaust pipe is provided with a magnetron exhaust pipe structure, characterized in that it is provided with a force transmission blocking groove so that the force applied to the junction of the lower end is cut.

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

3 is a longitudinal sectional view showing a structure of a magnetron having an exhaust pipe structure according to the present invention. The same parts as those in the related art are denoted by the same reference numerals, and detailed description thereof will be omitted.

Figure 4 is a longitudinal cross-sectional view showing a state in which the exhaust pipe having the structure of the present invention bonded to the A-ceramic, referring to this, the F-silk 16 and the F-ceramic ( 18) is joined by brazing, and the A-chamber 15, the A-ceramic 17, and the exhaust pipe 19 are joined to each other by brazing, and the inner space formed by such joining is about 10 ^-7 . It is possible to maintain the vacuum state of the, the central portion of the A-ceramic 17 has a force transmission blocking groove 100 of a predetermined depth is formed along the outer peripheral surface.

In the present invention configured as described above, the F-seal 16 and the F-ceramic 18 are brazed to the lower side of the anode cylinder 2, and the A-seal 15 and the A-ceramic 17 are upper side. And after joining the exhaust pipe 19 by brazing and joining the upper end of the exhaust pipe 19 with heat in a state where a vacuum is generated therein, the pressing force of the cutting tool during the cutting is such that A-ceramic 17 is to be transmitted to the bonded brazing joint along the body portion to block the force transmission blocking groove 100 to prevent cracking of the brazing joint that may occur in the cutting process.

That is, after brazing the exhaust pipe 19 to the upper end of the A-ceramic 17 as shown in Figure 4, when cutting the upper end of the exhaust pipe 19 using a cutting tool as shown in Figure 5 It is transmitted toward the lower end, and thus the force transmitted as such is blocked by the force transmission blocking groove 100 so that it is blocked from being transmitted to the brazing joint so that no force is transmitted to the brazing joint. Therefore, it is possible to prevent the occurrence of cracks in the brazing joint generated during cutting to prevent the occurrence of quality defects due to vacuum destruction that has been conventionally generated.

As described above in detail, the exhaust pipe structure of the magnetron according to the present invention forms a force transmission blocking groove along the outer circumferential surface at the center of the exhaust pipe, and at the same time cutting and joining the upper end of the exhaust pipe using a tool during assembly of the exhaust pipe. By the force transmitted to the lower end is blocked in the force transmission blocking groove, to prevent the occurrence of cracks in the brazing junction of the lower end of the exhaust pipe has the effect of preventing the occurrence of quality defects.

Claims (2)

In the magnetron is provided with an exhaust pipe for blocking the leakage of harmonic noise at the output portion of the high frequency energy output, The exhaust pipe structure of the magnetron is formed on the outer circumferential surface of the exhaust pipe and provided with a force transmission blocking groove so that the force applied to the junction of the lower end is cut off. The exhaust pipe structure of the magnetron according to claim 1, wherein the force transmission blocking groove is formed along an outer circumferential surface at a central portion of the exhaust pipe.