KR200152142Y1 - Vane of magnetron - Google Patents

Abstract

The present invention relates to a vane of a magnetron, the anode body 10 is formed in a cylindrical shape around the outer periphery of the filament 20, a plurality of vanes 14 between the anode body 10 and the filament 20 ), The end face 16 of each vane 14 facing the filament 20 by forming a wide cross-sectional area of each vane 14 facing the filament 20 so as to have a large capacitance By suppressing harmonics caused by the difference in distance between the upper side and the lower side, the efficiency of the magnetron is improved.

Description

Magnetron vane

The present invention relates to a magnetron generating microwaves, and more particularly, to a vane of a magnetron suitable for suppressing harmonics caused by a difference in distance between an upper side and a lower side of a vane facing the filament.

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. 915 used for magnetrons and industrial heating ranges, continuous and radar It is divided into a magnetron that generates a high frequency of the present invention relates to a magnetron used in a microwave oven.

Conventional magnetrons used in the microwave oven have a plurality of (generally, cavity resonators for inducing high frequency components inside the anode body 10 formed in a cylindrical shape by a copper pipe or the like as shown in FIG. 1). The even vanes 13 are arranged at equal intervals in the axial direction, and the anode body 10 and the vanes 13 constitute the anode portion.

In order to change the capacitance to obtain a uniform resonant frequency, the inner side equalization ring 15 and the outer side equalization ring 17 are alternately connected to the vane 13 at upper and lower portions thereof, respectively, on the top end side of the vane 13. The working space 23 is formed on the central axis of the anode body 10 between the tip portions of the plurality of vanes 13 and the filaments 20.

In the working space 23, tungsten (W) is formed of a mixture of thorium oxide (ThO ₂ ), and a spirally wound filament 20 is disposed coaxially with the anode body 10. 20 is heated by an operating current provided from the outside to emit hot electrons.

On the other hand, the upper shield hat 25 and the lower shield hat 27 is fixed to both ends of the filament 20 in order to prevent the emitted hot electrons radiate in the direction of the central axis, respectively, of the lower shield hat 27 In the center part, the first filament electrode 30, which is a central support made of molybdenum, is welded and fixed to the lower end of the upper shield hat 25 through a through hole formed in the center part, and the bottom surface of the lower shield hat 27 is made of molybdenum material. 2 filament electrodes 33 are welded together.

Here, the first filament electrode 30 and the second filament electrode 33 are connected to the power supply terminal 37 through a through hole formed in the insulating ceramic 35 supporting and fixing the filament 20 of the magnetron. It is a cathode support electrically connected to the first external connection terminal 40 and the second external connection terminal 43 to supply a current to the filament 20, the first filament electrode 30 penetrates the central axis of the filament 20 While supporting the upper shield hat (25).

In addition, the upper pole 45 and the lower pole 47 which form a magnetic path at both side openings of the anode body 10 to uniformly form the magnetic flux in the working space 23 between the filament 20 and the vanes 13. ), And the upper pole 45 and the lower polypolish 47 are funnel-shaped magnetic bodies.

In addition, upper and lower shield cups 50 and 53 are welded and adhered to upper and lower portions of the upper poly 45 and the lower poly 47, respectively, and the upper shield cup 50 and the lower shield cup At the upper and lower parts of 53, the antenna ceramic 55 and the insulating ceramic 35 are closely attached and welded to seal the inside of the anode body 10 in a vacuum state.

In addition, a cylindrical antenna ceramic 55 for insulating the antenna cap 57 to be described later is joined to the upper opening end of the upper shield cup 50 constituting the output portion of the magnetron, and an upper end portion of the antenna ceramic 55 is joined. There is a copper pipe exhaust pipe 60 is bonded, the inner central portion of the exhaust pipe 60 is provided with an antenna 63 for outputting a high frequency oscillated in the public resonator, the antenna 63 is the vane (13) Derived from, the end is fixed in the exhaust pipe (60) while extending through the central portion of the upper poly (45) axially.

The outer surface of the exhaust pipe 60 protects the welding fixing portion of the exhaust pipe 60, 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 55 and the antenna cup 57 is covered.

In addition, the outer side of the positive electrode body 10 is provided with an upper yoke 60 and a lower yoke 61 for determining the amount of magnetic flux in the positive electrode body 10 to connect the return magnetic flux, the positive electrode body Between the 10 and the lower yoke 61, a plurality of aluminium cooling fins 65 are fitted by the clamp member 67 fixed to the anode body 10 and the lower yoke 61, and the magnet is disposed. Together with the A 70 and the magnet K 73, the shape of the magnetic path is covered by the upper yoke 60 and the lower yoke 61.

The magnetron configured as described above has the first external connection terminal 40 and the first filament when the external power is provided to the first external connection terminal 40 and the second external connection terminal 43 through the power supply terminal 37. A closed circuit composed of an electrode 30, an upper shield hat 25, a filament 20, a lower shield hat 27, a second filament electrode 33, and a second external connection terminal 43 is configured to form a filament 20. The operating current is supplied to the

Then, the filament 20 is heated by the operating current provided to the filament 20 to emit hot electrons from the filament 20, thereby forming an electron group by the released hot electrons.

At this time, a strong electric field is formed in the working space 23 between the filament 20 and the vane 13 by the driving voltage applied to the second filament electrode 33 and the anode portion (that is, the anode body 10 and the vane 913). Is formed, the magnetic field generated by the magnet A (70) and the magnet K (73) is guided along the lower poly (47) toward the working space (23) and proceeds to the upper poly (45) through the working space (23) While a high magnetic field is formed in the working space (23).

Therefore, the electron group formed by the hot electrons emitted from the filament 20 into the working space 23 is formed by the strong electric field and the high magnetic field formed in the working space 23 (the anode body 10 and the vane 13). It proceeds while making a spiral rotational movement in the direction, and this movement of the electron group takes place in all the spaces of the working space 23.

At this time, the heat generated as the electron group formed of the hot electrons repeatedly proceeds toward the anode part (the anode body 10 and the vane 913) according to the structural resonance circuit of the vane 13 and the cavity resonator. 2450, which is a resonance high frequency corresponding to the speed at which the electron group rotates and is transmitted to the cooling fins 65 described in the anode body 10 through the anode body 10). The high frequency of is induced from the vane 13.

Then, the high frequency 2450 induced from the vane 13 ) Is transmitted to the exhaust pipe 60 through the antenna 63, provided to the microwave through a wave guide (Wave Guied), 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 electron group in the working space 23 is the vane in the filament 20 in the state that the upper separation distance (d1) and the lower separation distance (d2) of the filament 20 and vanes 13 shown in FIG. Do horizontal movement with (13).

However, in the manufacturing process of the magnetron, the difference between the upper separation distance d1 and the lower separation distance d2 of the vanes and filaments is generated. (C is the capacitance, d is the separation distance), so the capacitance varies according to the separation distance, which causes the electron group in the working space to move vertically from the place where the capacitance is large to the very small harmonic in the magnetron. .

Accordingly, the present invention has been made in view of the above problems, and a plurality of grooves are formed in the front end surface of the vane facing the filament, so that the harmonics generated by the separation distance between the filament and the vane are suppressed. The purpose is to provide vanes.

In order to achieve the above object, the vane of the magnetron according to the present invention has a cathode body formed in a cylindrical shape around an outer circumference of the filament, and in the magnetron having a plurality of vanes provided between the anode body and the filament, It is characterized in that the cross-sectional area of each vane facing is formed wide.

1 is a cross-sectional view showing the structure of a general magnetron.

FIG. 2 shows vanes in the magnetron of FIG. 1. FIG.

3 is a view showing the vanes of the magnetron according to the present invention.

* Explanation of symbols for main parts of the drawings

10: bipolar body 13,14: vane

16: end face 18: groove

20: filament 23: working space

25: upper shield hat 27: lower shield hat

45: upper pole piece 47: lower pole piece

60: upper yoke 63: lower yoke

65: cooling fin 70: magnet A

73: magnet K

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

3 is a view illustrating the vanes of the magnetron according to the present invention.

As can be seen by comparing the shape of the vanes 13 in FIG. 2 showing the vanes of the conventional magnetron, and the vanes 14 in FIG. 3 showing the vanes of the magnetron according to the present invention, The shape of the vane 14 according to the invention is formed in the front end surface 16 of the vane 14 facing the filament 20, two grooves 16 are formed at a predetermined interval (a).

An operation process of the vanes of the magnetron according to the present invention having the structure as described above will be described in more detail with reference to FIG. 3.

As can be seen with reference to Figure 3, the vane 14 according to the present invention is a plurality of vanes (14) in the front end surface 16 of each vane 14 facing the filament 20 to increase the capacitance to remove harmonics For example, two concave grooves 18 are predetermined (for example, 8 to 9). Is formed at a distance a).

Accordingly, the vertical motion of the electron group in the working space 23 is the tip end surface 16 of the vane 14 in the difference between the upper separation distance d1 and the lower separation distance d2 between the filament 20 and the vane 14. Since it is suppressed by the groove | channel 18 formed in), very high harmonics in a magnetron are suppressed and the efficiency of a magnetron improves.

Therefore, by using the present invention, the capacitance of the vane is largely formed, thereby suppressing harmonics caused by the distance between the upper side and the lower side between the filament and the vane, thereby improving the efficiency of the magnetron.

Claims (3)

In the magnetron in which the anode body 10 is formed in a cylindrical shape around the outer side of the filament 20 and a plurality of vanes 14 are provided between the anode body 10 and the filament 20, the filament 20 The vane of the magnetron, characterized in that a wide cross-sectional area of each vane (14) facing the). The vane of the magnetron according to claim 1, wherein a plurality of grooves 18 are formed in a concave shape in the front end surface 16 of each vane 14 at a predetermined interval to widen the cross-sectional area of the vanes 14. . The vane of a magnetron according to claim 2, wherein a gap between said grooves is 8 to 9 mm.