KR100455195B1 - Magnetic focusing structure of magnetron - Google Patents

Abstract

In the magnetic field converging structure of the magnetron of the present invention, protrusions 200 are formed so that both sides of the yoke 1 protrude inward, and the upper and lower magnets 21 and 22 and the yoke 1 and the upper and lower pole pieces ( By concentrating the magnetic field formed by the 13) and 14 in the working space 6, the energy is actively converted in the working space 6, thereby improving the high frequency energy generation efficiency.

Description

MAGNETIC FOCUSING STRUCTURE OF MAGNETRON}

The present invention relates to a magnetic field focusing structure of a magnetron, and more particularly, to a magnetic field focusing structure of a magnetron in which the magnetic field formed in the magnetron is focused in the working space between the filament and the vane, thereby improving efficiency.

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.

When the DC power is supplied to the filament, which is the cathode (CATHODE), the filament generates heat and radiates hot electrons. A strong electric field is formed in the working space between the filament and the vane by the driving voltage applied to the anode (ANODE). At the same time, the magnetic flux generated by the upper magnet and the lower magnet forms a magnetic field passing through the yoke, the lower pole piece and the working space, and the hot electrons are accelerated and rotated, and the phase speed of the high frequency electric field between the vanes and the vanes and the rotation speed of the electrons are At that time, the energy of the electrons is moved into the high frequency electric field and converted into micro energy, which is radiated to the cavity of the microwave oven through the antenna to heat food.

However, the magnetic path formation in the conventional magnetron configured as described above simply forms a closed circuit passing through the upper and lower magnets and the yoke and the upper and lower pole pieces, and thus does not substantially affect the working space in which electrons are emitted. There was a problem with limitations in improving.

SUMMARY OF THE INVENTION An object of the present invention devised in view of the above problems is to provide a magnetic concentrating structure of a magnetron suitable for improving the efficiency of a device by concentrating a magnetic closed circuit formed by a magnet in a working space by a simple structure. .

1 is a perspective view showing a magnetron having a magnetic field concentrating structure according to an embodiment of the present invention.

2 is a longitudinal cross-sectional view of FIG.

3 is a cross-sectional view showing another embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

1: yoke 2: anode cylinder

3: vane 6: working space

7: filament 21: upper magnet

22: lower magnet 100: magnetic member

200: protrusion

In order to achieve the object of the present invention as described above, the inner filament of the cathode is provided at the inner central portion of the yoke, and the vane and the anode cylinder, which are anodes, are provided with upper and lower magnets on the upper and lower sides of the cathode and the anode. In the magnetron, magnetic field concentrating structure of the magnetron is provided, wherein both sides of the yoke are bent inwardly so that a magnetic field can be focused to form a protrusion.

Hereinafter, the magnetic field concentrating structure of the magnetron of the present invention configured as described above will be described in more detail with reference to embodiments of the accompanying drawings.

1 is a perspective view illustrating a magnetron having a magnetic field concentrating structure according to an embodiment of the present invention, and FIG. 2 is a longitudinal cross-sectional view of FIG. 1.

As shown in the drawing, an anode cylinder 2 made of a cylindrical shape using a copper pipe is installed inside the yoke 1 where the upper yoke 1a and the lower yoke 1b are combined to have a shape of approximately "wh". Inside the anode cylinder 2, a plurality of vanes 3 forming a cavity resonator are arranged at equal intervals in the axial direction so as to induce high frequency components. The inner and outer pressure equalizing rings 4 and 5 are coupled to the upper and lower parts alternately so that the anode cylinder 2 and the vane 3 form an anode part.

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 to the upper pole piece 13 and the lower pole piece 14 having a funnel shape made of magnetic material, and the upper and lower poles of the upper pole piece 13. At the lower side of the piece 14, the cylindrical A-chamber 15 and the F-chamber 16 are brazed, respectively, and the high frequency is at the upper side of the A-chamber 15 and the lower side of the F-chamber 16. A-ceramic (17) for outputting to the outside and F-ceramic (18) for insulation are brazed, the exhaust pipe 19 is brazed to the upper side of the A-ceramic (17), The upper end of the exhaust pipe 19 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 contact the inner surface of the yoke 1, so that the upper and lower pole pieces 13, 14 ) Can be formed 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.

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 junction of the exhaust pipe 19 is protected on the upper side of the A-ceramic 17. The antenna cap 42 is covered.

In addition, the magnetic member 100 is installed in both sides of the yoke 1 in the horizontal direction so that the center of the magnetic field formed by the upper and lower magnets 21 and 22 can pass through the working space 6. The cross section of the magnetic member 100 is trapezoidal in shape so that the magnetic field can be focused in the working space 6.

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.

On the other hand, a strong electric field is formed in the working space 6 due to the driving voltage supplied to the anode portion through the side leads 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.

In addition, since the magnetic field formed by the upper and lower magnets 21 and 22 is concentrated in the working space 6 by the magnetic member 100, energy conversion to microwaves is actively progressed, thereby generating energy efficiency. Compared to the above, it is greatly improved.

3 is a cross-sectional view showing another embodiment of the present invention, as shown, by bending both sides of the yoke 1 to protrude inwardly to form a protrusion 200 in the horizontal direction, the protrusion formed in this way ( The magnetic field passing through the 200 affects the upper and lower pole pieces 13 and 14 so that the magnetic field passing between the upper pole piece 13 and the lower pole piece 14 can be concentrated in the working space 6. have.

As described in detail above, the magnetic field converging structure of the magnetron of the present invention bends the inner both sides of the yoke inward to form protrusions, so that the magnetic field formed by the upper and lower magnets and the yoke and the upper and lower pole pieces is formed on the protrusions. By concentrating on the working space, the energy is actively converted in the working space, thereby improving the energy generation efficiency.

Claims (3)

delete delete In the magnetron in which the cathode is provided with a filament at the inner center of the yoke, a vane and an anode cylinder as anodes, and upper and lower magnets are provided at the upper and lower sides of the cathode and the anode, Magnetic field concentrating structure of the magnetron, characterized in that the both sides of the yoke bent inwardly to form a magnetic field so that the magnetic field can be focused.