KR20040061408A - Cooling pin assembly structure of magnetron - Google Patents

Abstract

PURPOSE: A cooling fin assembly structure is provided to reduce assembly procedures and time by permitting cooling fins to be easily assembled to an anode cylinder. CONSTITUTION: A magnetron comprises a plurality of cooling fins(41) having bent portions(41a), and which are press fit to the outer surface of an anode cylinder. Each of the bent portions of the cooling fins has a stepped portion(100) in such a manner that the cooling fins are stacked and assembled in advance so as to thereby form an assembly(200).

Description

Cooling fin assembly structure of magnetron {COOLING PIN ASSEMBLY STRUCTURE OF MAGNETRON}

The present invention relates to a cooling fin assembly structure of a magnetron, and more particularly, a magnetron to reduce assembly labor by allowing the assembly to be temporarily assembled to the anode cylinder in the state where several cooling fins are assembled into one assembly. It relates to a cooling fin assembly structure of.

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 is 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.

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 the conventional general magnetron configured as described above, the external power is supplied to the center lead 10 and the side lead 11 through the F-lead 28 so that the F-lead 28, the center lead 10, A closed circuit composed of the filament 7, the top shield 8, the end shield 9, the side lead 11, and the disk 29 is configured so that the operating current is supplied to the filament 7, and thus The filament 7 is heated by the operating current and hot electrons are emitted, and the electron group is formed by the hot electrons thus emitted.

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, the magnetron as described above generally emits a microwave having a fundamental wave of 2.45 GHz, and the emitted microwave contains harmonic components having a frequency of an integral multiple of the fundamental wave. Leakage of this unwanted harmonic component causes undesirable effects such as communication disturbance. Especially, the fifth harmonic (12.25 GHz) is known to cause disturbance in satellite communication, and the fifth harmonic component is a filament (7). ) Becomes an antenna and flows back to the input side through the center lead 10, the side lead 11, and the F-lead 28, and the fifth harmonic component thus flowed back is installed inside the filter box 26. It is removed by the L and C existing between the choke coil 27 and the capacitor 31, while preventing leakage to the outside by the filter box 26.

On the other hand, Figure 2 is a cross-sectional view showing the assembly state of the conventional cooling fin, as shown in this, the cooling fins 41 are formed in the inner end bent portion (41a) bent in a "??" shape In this case, the cooling fins 41 are assembled by injecting several cooling fins 41 into the outer circumferential surface of the anode cylinder 2 in turn.

However, the conventional magnetron is configured as described above, when assembling the cooling fins 41 in order to assemble the cooling fins 41 in the anode cylinder 2, the assembly is cumbersome and takes a lot of assembly time. there was.

An object of the present invention devised in view of the above problems is to provide a cooling fin assembly structure of a magnetron suitable for easily assembling the cooling fins in the anode cylinder to reduce the assembly labor and assembly time.

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

Figure 2 is a cross-sectional view showing an assembled state of the conventional cooling fins.

Figure 3 is a longitudinal sectional view showing a magnetron having a cooling fin assembly structure according to the present invention.

4 is an enlarged view of a portion A of FIG. 3;

Figure 5 is a cross-sectional view showing the assembly operation of the present invention.

Explanation of symbols on the main parts of the drawings

2: anode cylinder 41: cooling fin

41a: bend portion 100: stepped portion

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

In the magnetron is assembled by pressing a plurality of cooling fins formed with a bent portion on the outside of the anode cylinder,

The bent portion of the cooling fins is provided with a magnetron cooling fin assembly structure, characterized in that the stepped portion is formed so that a plurality of cooling fins can be preassembled in advance.

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

Figure 3 is a longitudinal cross-sectional view showing a magnetron having a cooling fin assembly according to the present invention, Figure 4 is an enlarged view of the portion A of Figure 3, as shown, the basic structure of the magnetron is the same as the conventional structure is the same The same reference numerals are used for, and detailed description thereof will be omitted.

Here, in the present invention, a plurality of cooling fins 41 are coupled to the outer surface of the anode cylinder 2, each of the "??" type in the bent portion (41a) formed on the inner end of the cooling fins 41 By forming the stepped portion 100 to be bent in advance to assemble the cooling fan 41 in a stacked manner to be assembled into one assembly 200.

When assembling the cooling fins 41 to the anode cylinder 2 in the present invention configured as described above, other cooling fins 41 'to the stepped portion 100 of the cooling fins 41 as shown in FIG. A plurality of cooling fins 41 are stacked in such a manner that the lower end of the anode 200 is inserted into the assembly 200 at a time as shown in FIG. Since it is assembled by press-fitting to the outside, not only the assembly of the cooling fins 41 can be facilitated, but also the assembly is made in a short time.

As described in detail above, the cooling fin assembly structure of the magnetron of the present invention forms a step portion so as to assemble several in advance in the bent portion of the cooling fin assembled on the outer side of the anode cylinder, and the plurality of cooling fins when assembling the cooling fins After assembling in a laminated manner in advance to assemble into a single assembly, such assembly is press-fitted into the anode cylinder at a time to assemble, the assembly is easy, the assembly time is reduced, thereby improving the productivity have.

Claims (2)

In the magnetron is assembled by pressing a plurality of cooling fins formed with a bent portion on the outside of the anode cylinder, The bent portion of the cooling fins magnetron cooling fins assembly structure, characterized in that the stepped portion is formed so that a plurality of cooling fins can be assembled in advance in a stack. The structure of claim 1, wherein the stepped portion is bent in a “??” shape at an upper end portion of the bent portion.