KR100857601B1 - Magnetron and electromagnetic wave shielding gasket - Google Patents

Abstract

A magnetron and an electromagnetic wave shielding gasket are provided to reduce a manufacture cost by forming the electromagnetic wave shielding gasket with an aluminum alloy. A magnetron includes a yoke(10), an anode cylinder(31), a plurality of anode vanes(32), an upper magnet(22), a lower magnet(23), a cathode filament(41), an input unit(50), and an antenna rod(61). The magnetron further includes an electromagnetic wave shielding gasket(70) at an opening portion(12) of the yoke. The electromagnetic wave shielding gasket includes a through hole at a central portion and an expansion unit. The through hole covers the opening portion to prevent an electromagnetic wave generated inside the yoke from being leaked outside the yoke and protrude the antenna rod to the outside. The expansion unit is overlapped with at least a portion of the yoke by being expanded to the outside.

Description

Magnetron and electromagnetic wave shielding gasket provided therein

1 is a front sectional view schematically showing a magnetron according to an embodiment of the present invention.

2 is a perspective view schematically showing the electromagnetic leakage preventing gasket of the magnetron according to an embodiment of the present invention.

3A to 3D are views illustrating a manufacturing process of an electromagnetic leakage preventing gasket of a magnetron according to an embodiment of the present invention.

<Description of Signs of Major Parts of Drawings>

10 ... York 11,14 ... Upper, Lower York

12.opening 16.cooling fin

20 ... High frequency generator 21 ... Operation space

22,23 upper and lower magnets 30 positive pole

31 Anode cylinder 32 Anode vane

34, 35 upper and lower pole pieces 40 negative electrode

41.cathode filament 44.center lead

45 ... side lead 50 ... input

51 Plug 60 Output

61 ... Antenna rod 70 ... Electromagnetic leak prevention gasket

73 ... aluminum alloy wire 74 ... mesh

The present invention relates to a magnetron used in a high frequency heating device and the like, and more particularly, to a magnetron and an electromagnetic leakage preventing gasket provided therein, which can prevent leakage of electromagnetic waves generated from the magnetron to the outside.

In general, the magnetron is a device that generates a strong high frequency by applying a magnetic field to control the flow of electrons, and is used in a high frequency heating device such as a microwave oven, a device such as a particle accelerator, and a radar. The most commonly found magnetrons are magnetrons in high frequency heating devices used for home or food service. The magnetron provided in the high frequency heating device forms a group of electrons having a frequency of about 2450 MHz by the high voltage applied to the magnetron, and the high frequency energy is radiated into the cooking chamber through the output unit to cook food in the cooking chamber.

Basically, the magnetron includes an anode part surrounded by an outer yoke and a plurality of cooling fins, a cathode part installed at an inner central part of the anode part, an output part for inducing high frequency, an input part for power input. It includes an upper magnet and a lower magnet installed on the upper and lower portions of the anode portion to form a magnetic field in the working space formed between the anode portion and the cathode portion. The anode portion includes an anode cylinder having an empty interior, a plurality of anode vanes arranged radially around the center of the anode cylinder, and upper and lower pole pieces respectively installed on upper and lower portions of the anode cylinder, and the cathode portion of the anode cylinder. A coil-shaped filament disposed in the center, and a center lead and side leads for supplying power to the filament. The output unit includes an antenna rod having one end coupled to the anode vane to oscillate high frequency to the outside, and the input unit includes a plug for supplying external power to the center rod and the side rod.

Magnetron composed of this configuration is formed of electron group in the working space between the filament and the anode vane when power is applied to the filament through the center lead and side lead, and due to the influence of the strong electric field and the magnetic field formed in the working space The high frequency is induced in the anode vane during spiral rotation. This high frequency oscillates to the outside through the antenna rod.

Magnetrons are used in conjunction with waveguides that guide high frequency walls or walls. If a coupling gap occurs when the magnetron is coupled, high frequency oscillated from the magnetron may leak out of the device through this coupling gap. High frequency leakage to the outside of the high frequency device is not only harmful to the human body, but may also lead to communication interruption and reduced output of the high frequency device.

In order to prevent such high frequency leakage, an electromagnetic leakage preventing gasket is installed at the output of the magnetron. The gasket is disposed between the magnetron and the wall of the high frequency device, or between the magnetron and the waveguide to prevent leakage of electromagnetic waves through the coupling gap.

However, the conventional magnetron mainly uses an electromagnetic leakage preventing gasket made of brass (Cu). The gasket made of brass has good tensile strength, corrosion resistance, elongation, etc., but the price is high, causing the magnetron to increase its manufacturing cost.

An object of the present invention is to provide a magnetron and an electromagnetic leakage preventing gasket provided therein, which can reduce manufacturing costs while maintaining electromagnetic leakage preventing performance as it is.

The magnetron according to the present invention for achieving the above object is a yoke having an opening, an anode cylinder provided in the inside of the yoke, the working space is provided in the center, a plurality of anode vanes disposed around the working space, An upper magnet and a lower magnet installed on the upper and lower parts of the anode cylinder, a cathode filament installed in the working space to be spaced apart from the plurality of anode vanes, a center rod and a side rod for supplying power to the filament, and An antenna rod connected to the anode vane and the other end protruding to the outside of the yoke through the opening, wherein the opening of the yoke prevents electromagnetic waves generated from the inside of the yoke from leaking to the outside of the yoke; Electromagnetic waves having a through hole covering the opening to allow the antenna rod to protrude outside The leakage preventing gasket is installed, the electromagnetic leakage preventing gasket is characterized in that made of aluminum alloy.

Here, the electromagnetic leakage preventing gasket may be made of an aluminum alloy wire.

The electromagnetic leakage preventing gasket may be formed in a mesh network in which the aluminum alloy wire is entangled in a mesh structure.

In addition, the aluminum alloy wire diameter of the electromagnetic leakage preventing gasket may be 0.1 ~ 0.3mm.

In addition, the mesh size of the electromagnetic leakage preventing gasket may be 250 ~ 350mm.

In addition, the component ratio of aluminum in the total component ratio of the electromagnetic wave leakage preventing gasket may be 92 ~ 98%.

In addition, the electromagnetic leakage preventing gasket may be made of an aluminum alloy in which at least one of magnesium, manganese, and iron is mixed with an additive.

On the other hand, the electromagnetic wave leakage preventing gasket of the magnetron according to the present invention for achieving the above object is installed in the opening so that the electromagnetic wave generated inside the yoke surrounding the high frequency generating unit does not leak through the opening provided in the yoke, It is made of an aluminum alloy.

Hereinafter, a magnetron and an electromagnetic leakage preventing gasket provided therein will be described with reference to the accompanying drawings.

As shown in FIG. 1, the magnetron according to the present invention includes a yoke 10 having an opening 12, a high frequency generator 20 installed inside the yoke 10 to generate a high frequency, and a high frequency. The input unit 50 for applying power to the generator 20, the output unit 60 for oscillating the high frequency generated by the high frequency generator 20 to the outside of the yoke, and generated inside the yoke 10 It includes an electromagnetic leakage preventing gasket 70 coupled to the opening 12 of the yoke 10 to prevent electromagnetic waves from leaking to the outside.

The yoke 10 includes an upper yoke 11 and a lower yoke 14. An opening 12 through which the output unit 60 passes is provided at the center of the upper yoke 11, and a connector 15 for connecting the input unit 50 is provided at the center of the lower yoke 14. In addition, the upper yoke 11 is provided with a fastening protrusion 13 coupled to the fastening groove 91 provided in the waveguide (or wall) 90 of the high frequency device. Since the fastening protrusion 13 is inserted into the fastening groove 91 of the waveguide 90, the magnetron may be coupled to the waveguide 90. When the magnetron is coupled, the output unit 60 is inserted into the guide groove 92 provided in the waveguide 90 so as to oscillate high frequency into the waveguide 90.

The high frequency generator 20 includes an anode part 30, a cathode part 40, and an upper magnet 22 and a lower magnet 23 that are respectively installed on the upper and lower parts of the anode part 30. The anode part 30 is surrounded by a plurality of cooling fins 16 and includes a cathode cylinder 31 having a working space 21 at a central portion thereof, and a plurality of anode vanes arranged radially around the working space 21. (32) and the upper pole piece (34) respectively installed on the upper and lower portions of the anode cylinder (31) so that the magnetic field formed by the upper magnet (22) and the lower magnet (23) is concentrated in the working space (21); Lower pole piece 35 is included. Each anode vane 32 has an outer end thereof fixed to an inner side of the anode cylinder 31, and an inner end thereof fixed to a strap ring 33. In order to seal the inside of the anode cylinder 31 to prevent oxidation of components, upper and lower vacuum tubes 24 and lower vacuum tubes 26 are installed at upper and lower portions of the anode cylinder 31. The upper vacuum tube 24 and the lower vacuum tube 26 penetrates through the upper magnet 22 and the lower magnet 23, respectively, and protrudes into the opening 12 and the connector 15 of the yoke 10. Each of the vacuum tubes 24 and 26 is provided with flange portions 25 and 27 extending outwardly, and each flange portion 25 and 27 is welded to the upper and lower portions of the anode cylinder 31, respectively. .

The cathode portion 40 is a coil-shaped cathode filament 41 is installed in the center of the working space 21 so as to be spaced apart from each anode vane 32, and the upper shield coupled to the upper and lower ends of the cathode filament 41, respectively (42) and the center shield 44, which is installed in the center of the lower shield 43, the cathode filament 41, the upper end is coupled to the upper shield 42, and the lower end passes through the lower shield 43 And a side lead 45 coupled to the circumference of the lower shield 43. The center lead 44 and the side lead 45 are connected to an external power source to apply power to the cathode filament 41, and the lower part of the center lead 44 and the side lead 45 is surrounded by an insulator 46. It is fixed. When power is applied to the center lead 44 and the side lead 45, the cathode filament 41 emits hot electrons toward the anode vane 32.

The input unit 50 has a plug 51 connected to the center lead 44 and the side lead 45 to supply power, and electromagnetic waves generated from the anode cylinder 31 so as not to leak to the outside through the connector 15. The filter box 52 is coupled to the lower yoke 14 and covers the connector 15.

The output unit 60 includes an antenna rod 61 whose one end is connected to one anode vane 32 and the other end is extended to the outside through the opening 12 to oscillate a high frequency to the outside of the yoke 10. .

The magnetron according to the present invention having such a configuration has a negative electrode filament (heat) while the negative electrode filament 41 is heated when power is applied to the negative electrode filament 41 through the center lead 44 and the side lead 45 of the negative electrode portion 40. 41, hot electrons are emitted. An electron group is formed by the emitted hot electrons in the working space 21 between the cathode filament 41 and the plurality of anode vanes 32. In addition, a strong electric field is formed in the working space 21 by the driving voltage applied to the anode part 30, and the magnetic field generated by the upper magnet 22 and the lower magnet 23 is formed on the upper pole piece 34 and the lower part. It acts in the vertical direction through the pole piece 35. Thereby, the electron group emitted from the cathode filament 41 to the working space 21 proceeds toward the anode vane 32 while performing a spiral rotational motion under the influence of a strong electric field and a magnetic field, and corresponds to the speed at which the electron group rotates. The high frequency of the resonance frequency is induced into the anode vanes 32. The high frequency induced from the anode vanes 32 is oscillated to the outside of the yoke 10 through the antenna rod 61 and guided by the waveguide 90.

As such, while the high frequency is generated in the high frequency generator 20 inside the yoke 10, electromagnetic waves generated inside the yoke 10 are transferred to the yoke 10 and the waveguide through the opening 12 of the yoke 10. 90 may leak into the coupling gap between the electromagnetic wave leakage preventing gasket 70 installed in the opening 12 of the yoke 10 to prevent the electromagnetic wave from leaking.

As shown in FIG. 2, the electromagnetic leakage preventing gasket 70 according to the present invention has a donut shape having a through hole 71 so that the output part 60 can penetrate the center portion thereof, and has an opening 12. It has an extension 72 extending around the bottom to completely cover the. In addition, the electromagnetic leakage preventing gasket 70 is elastic in the form of a mesh network 74 (see FIG. 3B) in which an aluminum alloy wire 73 is intertwined in a mesh structure, and has an opening 12 and a yoke 10. And it is coupled without a gap between the waveguide (90).

In addition, the electromagnetic leakage preventing gasket 70 according to the present invention is made of an aluminum alloy in which additives are mixed with aluminum main components. As the additive, magnesium (Mg), manganese (Mn), iron (Fe) may be used, and any one or two or more thereof may be added. It is preferable that the component ratio of aluminum in all the components is 92 to 98%.

3A to 3D illustrate a process of manufacturing the electromagnetic leakage preventing gasket 70 according to the present invention.

In manufacturing the electromagnetic leakage preventing gasket 70, first, an aluminum alloy wire 73 is made as shown in FIG. 3A. The diameter of the aluminum alloy wire 73 is 0.1 ~ 0.3mm, more preferably 0.2 ± 0.05mm in size, the tensile strength is 65 ~ 100Kg / mm2, the elongation is 20 magnetron or more. A large number of such aluminum alloy wires 73 are made to have a weight of 3.1 ± 0.3g.

After the aluminum alloy wire 73 is made, a plurality of aluminum alloy wires 73 are weaved like a net as shown in FIGS. 3B and 3C to form a mesh network 74 of mesh structure. Here, the size of each mesh 75 is 250-350 mm, More preferably, the size of 300 ± 4 mm. The number of aluminum alloy wires 73 used for the mesh net 74 is to be 27 ± 5. When forming the mesh network 74, as shown in FIG. 3B, the mesh network 74 is formed in the form of a hollow gear by using the molding structure 80 having different lengths of upper and lower widths.

After fabrication of the mesh net 74, the mesh net 74 is placed in a mold (not shown) and compressed up and down to complete the electromagnetic leakage preventing gasket 70, which is hollow and composed of a plurality of layers, as shown in FIG. 3D. Let's do it. When the mesh network 74 is compressed, the number of large and small ring-shaped wires constituting the electromagnetic leakage preventing gasket 70 is 80 ± 10.

 Since the electromagnetic leakage preventing gasket 70 having the above configuration has a donut shape in which a plurality of mesh networks 74 are stacked, it has elasticity and elastic deformation when the magnetron is coupled to the waveguide 90. While being able to closely adhere to the waveguide 90, it is not easily deformed even when used for a long time.

Since the electromagnetic leakage preventing gasket according to the present invention described above is made of aluminum alloy, the electromagnetic leakage preventing performance is not inferior to that of the conventional electromagnetic leakage preventing gasket made of brass, but the manufacturing cost is reduced by about 30 magnetrons. Therefore, the overall manufacturing cost of the magnetron can be reduced.

The present invention described above is not limited to the configuration and operation as illustrated and described. That is, the present invention is capable of various changes and modifications within the spirit and scope of the appended claims.

Claims (14)

A yoke having an opening, an anode cylinder installed in the yoke and having a working space at a central portion thereof, a plurality of anode vanes disposed around the working space, and upper magnets installed at upper and lower portions of the anode cylinder And a lower magnet, a cathode filament installed in the working space so as to be spaced apart from the plurality of anode vanes, an input unit for supplying power to the cathode filament, and one end connected to the anode vane and the other end of the yoke through the opening. In the magnetron comprising an antenna rod protruding out of the, The opening of the yoke covers the opening to prevent leakage of electromagnetic waves generated from the inside of the yoke to the outside of the yoke, and a through hole is formed at the center of the antenna rod so as to protrude to the outside, and is formed to extend outward. And a electromagnetic leakage preventing gasket having an extension overlapping at least a portion of the yoke, wherein the electromagnetic leakage preventing gasket is made of an aluminum alloy. The method of claim 1, The electromagnetic leakage preventing gasket is a magnetron, characterized in that made of aluminum alloy wire. The method of claim 2, The electromagnetic leakage preventing gasket is a magnetron, characterized in that the aluminum alloy wire is made of a mesh network form entangled in a mesh (mesh) structure. The method of claim 3, wherein Magnetron, characterized in that the aluminum alloy wire diameter of the electromagnetic wave leakage prevention gasket is 0.1 ~ 0.3mm. The method of claim 3, wherein Magnetron, characterized in that the mesh size of the electromagnetic leakage preventing gasket is 250 ~ 350mm. The method of claim 3, wherein The magnetron of the total component ratio of the electromagnetic wave leakage preventing gasket is characterized in that the 92-98% of the magnetron. The method of claim 3, wherein The electromagnetic leakage preventing gasket is a magnetron, characterized in that made of aluminum alloy in which one or more of aluminum, magnesium, manganese, iron mixed with an additive. In the electromagnetic leakage preventing gasket of the magnetron is installed in the opening so that the electromagnetic wave generated inside the yoke surrounding the high frequency generating unit does not leak to the outside through the opening provided in the yoke, A through-hole formed at a center thereof and extending outwardly to overlap at least a portion of the yoke, Magnetron electromagnetic leakage preventing gasket, characterized in that the whole is made of aluminum alloy. The method of claim 8, The electromagnetic leakage preventing gasket is a magnetron electromagnetic shielding gasket, characterized in that made of aluminum alloy wire. The method of claim 9, The electromagnetic leakage preventing gasket is a magnetron electromagnetic leakage preventing gasket, characterized in that the aluminum alloy wire is made of a mesh structure entangled in a mesh (mesh) structure. The method of claim 10, The aluminum alloy wire diameter of the electromagnetic leakage preventing gasket is 0.1 ~ 0.3mm, characterized in that the electromagnetic leakage prevention gasket of the magnetron. The method of claim 10, The electromagnetic wave leakage preventing gasket of the magnetron, characterized in that the mesh size of the electromagnetic leakage preventing gasket is 250 ~ 350mm. The method of claim 10, A component ratio of aluminum in the total component ratio of the electromagnetic wave leakage prevention gasket is a magnetron electromagnetic leakage prevention gasket, characterized in that 92 ~ 98%. The method of claim 10, The electromagnetic leakage preventing gasket is made of aluminum, magnesium, manganese, iron or more electromagnetic leakage leakage gasket of magnetron, characterized in that made of an aluminum alloy mixed with additives.

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