KR100618648B1 - Magnetron having noise filter improved and thereof manufacturing method - Google Patents

Abstract

The present invention relates to a magnetron having an improved noise filter and a method of manufacturing the same. More particularly, the structure of a capacitor constituting a filter mounted for attenuation of noise has a structure capable of absorbing or shielding electromagnetic waves. The present invention relates to a magnetron having a noise filter, and / or a method of manufacturing the same, which is improved to mount a noise attenuating agent made of a material capable of absorbing or shielding electromagnetic waves at a cathode part of the magnetron. According to the present invention as described above, the unwanted radiation wave and the noise emitted from the magnetron are absorbed or shielded by the capacitor and / or the noise damping effector to increase the attenuation rate of noise generation.

Magnetron, filter, noise, capacitor, electronic, ferrite

Description

MAGNETRON HAVING NOISE FILTER IMPROVED AND THEREOF MANUFACTURING METHOD}

1 is a cross-sectional view showing the internal structure of a magnetron having a conventional noise filter.

2 is a schematic circuit diagram of a noise filter installed in a conventional magnetron.

3A is a diagram illustrating components of a conventional noise filter.

3B is a partial cross-sectional view showing the internal structure of a capacitor constituting a conventional noise filter.

4A is a partial cross-sectional view illustrating the internal structure of a capacitor which is a component of an improved noise filter according to the present invention.

4B is a partial cross sectional view showing another embodiment of a capacitor which is a component of an improved noise filter according to the present invention.

5A is an exploded cross-sectional view of the capacitor shown in FIG. 4A.

FIG. 5B is an exploded cross-sectional view of the capacitor shown in FIG. 4B.

5C is a perspective view of a case which is one component of a capacitor according to the present invention.

5d is a perspective view of a cap which is one component of a capacitor according to the invention.

5E is a perspective view of a grounding bracket that is one component of a capacitor according to the present invention.

5F is a perspective view of an upserver as one component of a condenser according to the invention.

5G is a perspective view of a shield pipe that is one component of a condenser in accordance with the present invention.

6 is a perspective view showing another embodiment of the noise prevention structure according to the present invention.

* Description of the main parts of the drawings *

210 ... choke coil 300 ... condenser

310 ... Case 311 ... Cap insert

312 ... Engagement groove 313 ... Bracket insert

314 ... protrusion insert 315 ... electrode insert

316 ... dielectric space 320 ... cap

321 ... terminal insertion hole 322 ... engaging projection

323 .. Binding holes 324 ... Insertion protrusions

330 ... ground bracket 331 ... coupling

332 ... Case insertion hole 333 ... Binding hole insertion hole

340 ... live electrode 350 ... terminal

360 ... insulation tube 370 ... pipe

380 ... upserver 382,382 ... slot

400 ... discharge protection 410 ... noise damping agent

411 ... insertion hole

The present invention relates to a magnetron having an improved noise filter and a method of manufacturing the same. More particularly, the structure of a capacitor constituting a filter mounted for attenuation of noise has a structure capable of absorbing or shielding electromagnetic waves. In addition, and / or the present invention relates to a magnetron having a noise filter which is improved to be equipped with a noise attenuating agent made of a material capable of absorbing or shielding electromagnetic waves at a cathode part of the magnetron, and a method of manufacturing the same.

In general, the magnetron is applied to household products and is widely used as a device widely used to emit electrons while the filament of the negative electrode terminal is heated, and thus the electrons emitted from the electric field are perpendicular to the electric field by the magnet. It is a device that allows the object to be heated by using the energy of the ultra-short wave (that is, electromagnetic waves) by allowing the rotational movement through. The oscillated microwaves are emitted along the waveguide into the heating chamber and the oscillator power input.

These magnetrons are caused by collisions when hot electrons rotate due to the difference in the DC magnetic field strength in the oscillator's working space and the enclosed gas remaining in the inner space when the oscillation is performed. Noise is generated due to vibration, and the amount of emitted radio noise (electromagnetic waves in the 30 MHz to 1 GHz band or more than several tens of GHz bands) is caused by various factors in the manufacturing and designing of the oscillator, namely, Markne. It is added and subtracted according to the difference in the design structure and processing dimensions of the waveguide of the heating apparatus employing Tron, the heating capacity and the heating load.

The noise generated as described above causes the failure or malfunction of other electronic products located near the magnetron-mounted product, and is also regulated as a factor that greatly affects the human body. A noise filter was provided to reduce radiated noise in the 30 MHz to 1,000 MHz band that is subject to EMI regulation.

Referring to the magnetron equipped with the conventional anti-noise filter schematically, as shown in FIGS. 1 to 3B, the capacitor 30 having the choke coil 21 is mounted on the cathode side of the magnetron 10. The noise canceling filter 20 component is mounted.

The choke coil 21 is connected to the negative electrode terminal of the magnetron 10, the negative electrode terminal is configured to maintain the discharge distance by the discharge preventing port (11). The noise removing filter 20 component of the conventional magnetron 10 having such a structure attenuates noise through the choke coil 21 and the condenser 30, but its efficiency is reduced by the heat generated from the choke coil 21 itself. Falling.

In addition, in the capacitor 30 connected to the choke coil 21, the ceramic mold 37 is mounted on the insulating case 31, and the ceramic dielectric material 36 is formed by the epoxy resin 38 in the ceramic mold 37. ) And an insulating tube 35 which maintains a constant distance therebetween is positioned, and is composed of a conducting electrode 34 wrapped by the insulating tube 35. In addition, a ground bracket 32 is in contact with the ceramic dielectric 36, and a discharge case 39 is coupled to an upper portion of the ground bracket 32 to secure a discharge distance of the conducting electrode 34.

The condenser 30 having such a configuration is configured to block the flow of noise emitted by acting together with the choke coil 21, but the condenser 30 itself cannot act to attenuate the noise. The same conventional capacitor has a disadvantage in that productivity is low because the manufacturing is complicated and takes a lot of manufacturing time.

In other words, when the magnetron is operated for a predetermined time, heat is generated in the choke coil 21 due to the resistance of the flow of electrons flowing back, which causes a problem that the function of the filter is degraded due to an increase in the impedance value. . As a result, the problem that the unfiltered electrons are discharged to the outside of the noise removing filter 20 through the conducting electrode 34 and the terminal 33 remains.

One object of the present invention for solving the above problems is to improve the condenser separately from the action of the choke coil to attenuate the noise generated by the noise emitted from the magnetron to the outside due to the magnetic saturation of the choke coil The leakage noise is to allow the condenser itself to absorb and / or shield.

Another object of the present invention is to provide a filter capable of absorbing and / or shielding noise in a discharge prevention tool mounted on the cathode portion of the magnetron to extend the self saturation time of the choke coil, thereby making noise filter performance more stable. To improve as much as possible.

Another object of the present invention is to improve the structure of the capacitor constituting the noise removing filter to simplify the manufacture of the capacitor and to shorten the production time.

One feature of the present invention for achieving the above object includes a discharge preventing port, and a noise elimination filter composed of a capacitor and a choke coil mounted on the cathode to prevent noise of the magnetron, the capacitor is coupled to one end A cap insert having a groove is formed, a bracket insert is formed at the other end, and a protrusion insert having a hole penetrating from an end at which the cap insert is formed and an electrode insert having a through hole maintain a constant distance from each other so that the dielectric space can A case extending to be formed; A cap having a coupling protrusion formed vertically at a central portion thereof, the cap having a coupling protrusion formed around the upper end thereof; A grounding bracket having a coupling part inserted into and coupled to the bracket insertion part, a binding hole insertion hole being formed at the center portion, and a case insertion hole being formed at both sides of the binding hole insertion hole; A conducting electrode fitted to the electrode insertion unit; A terminal having one end connected to the conducting electrode while penetrating through the cap; A binding hole that penetrates through the binding hole insertion hole and is coupled to the binding hole coupling groove so that the ground bracket, the case, and the cap are integrally coupled; And an insulation tube coupled to the electrode insertion portion protruding to the outside of the bracket insertion portion.

The case is preferably made of a mixture of 5 to 50 parts by weight of a dielectric material in the heat-resistant resin material having an insulating property, 10 to 20 parts by weight of amorphous and / or ferrite-based magnetic material in the mixed state.                         

In addition, the cap is preferably formed by mixing 20 to 40 parts by weight of amorphous and / or ferritic magnetic materials with 60 to 80 parts by weight of a heat resistant resin material having insulating properties.

Here, the cap may be made by mixing 20 to 40 parts by weight of the conductive carbon black material to 60 to 80 parts by weight of the heat resistant resin material having insulating properties.

The dielectric space may be coupled to the pipe provided to the electrode of the dielectric according to the required capacitance, and also the ferrite and / or amorphous upserver to the lower and / or upper portion of the pipe 370 provided to the electrode of the dielectric (Noise absorber) may be optionally mounted.

In addition, the discharge preventing device mounted on the negative electrode of the magnetron may be formed by mixing 10 to 20 parts by weight of an amorphous and / or ferritic magnetic material with about 80 to 90 parts by weight of a ceramic material, and the discharge preventing device may be formed on a circular plate. An insertion hole is formed, and the noise attenuating agent made of amorphous and / or ferritic magnetic material may be combined.

In another aspect of the present invention, in the method for manufacturing a capacitor mounted on a noise canceling filter for a magnetron, the capacitor is mixed with a dielectric material of 5 to 50 parts by weight in a heat-resistant resin material having an insulating property, and thus mixed Amorphous and / or ferrite-based magnetic material is mixed by 10 to 20 parts by weight, and then prepared by injection molding through stirring, the cap is amorphous and / or ferrite 60 to 80 parts by weight of a heat-resistant resin material having an insulating property 20 to 40 parts by weight of the magnetic material may be mixed and then manufactured by injection molding through stirring.

Here, the cap may be manufactured by injection molding through stirring after 20 to 40 parts by weight of the conductive carbon black material is mixed with 60 to 80 parts by weight of the heat resistant resin material having insulating properties.

Hereinafter, the technical spirit of the present invention will be described in more detail with reference to the accompanying drawings.

4A, a capacitor 300 having a noise attenuation structure in accordance with the present invention is shown. The condenser 300 includes a case 310, a cap 320, and a ground bracket 330, and a terminal 350 inserted through the cap 320 is provided at a lower portion of the case 310. It is configured to be coupled to the conducting electrode 340 is inserted into the interior. The other end of the conducting electrode 340 is connected to the choke coil 210 used in the conventional noise reduction filter.

The case 310 is formed in a cylindrical shape, a cap insertion portion 311 having a coupling groove 312 into which the coupling protrusion 322 of the cap 320 to be described below is formed at one end, and is formed at the other end. The bracket insertion portion 313 is formed. Then, the protrusion insertion portion 314 having a hole through which the insertion protrusion 324 of the cap 320 is inserted from the end where the cap insertion portion 311 is formed is formed to extend upward.

In addition, an electrode inserting portion 315 having a hole into which the conducting electrode 340 is inserted is formed to maintain a constant distance from the protrusion inserting portion 314 from an end where the cap inserting portion 311 is formed. Here, the electrode inserting portion 315 is formed to have a predetermined interval with the inner surface of the case 310, as well as the projection inserting portion 314, the gap formed in this way has a capacitance that the capacitor 300 is required To act as the dielectric space 316.

The case 310 having such a configuration is processed and injected by mixing titanium oxide or titanic acid-based ferroelectric material with a heat-resistant resin material having excellent insulation properties of PPP, PBT, or PET. . In this case, when the ferroelectric material is 100 parts by weight mixed with the heat resistant resin material, the ferroelectric material is about 5 to 50 parts by weight to work together with the dielectric space 316 formed around the electrode insertion part 315 to electrostatically It is desirable to have a dose size of about 50-350 pF.

In this way, the amorphous and / or ferritic magnetic materials are mixed with the heat-resistant resin material in the state where ferroelectric materials are mixed in an amount of about 10 to 90 parts by weight, followed by injection molding. That is, it is preferable that the heat-resistant resin material in the state where the ferroelectric material is mixed is mixed at about 80 to 90 parts by weight.

As described above, the case 310 in which the ferroelectric material and the magnetic material are mixed has capacitance due to the dielectric properties of the dielectric space 316 and the case 310 itself. In addition, noise that is not filtered by the choke coil 210 may be generated. When flowing backward along the conducting electrode 340, the conduction electrode 340 is attenuated by magnetism of the electrode inserting portion 315 into which the conducting electrode 340 is inserted.

If it is necessary to further increase the capacitance according to the noise limiting standard, the pipe 370 provided as an electrode of the dielectric in the dielectric space 316 formed in the case 310 as shown in FIGS. 4B and 5B. May be inserted to surround the electrode insertion part 315. The pipe 370 provided as an electrode of the dielectric to be coupled in this way is selectively coupled to adjust the size of the capacitance.

In more detail, the size of the capacitance may be adjusted by adjusting the proportion of the dielectric material mixed in the case 310, but in the case of increasing the ratio of the dielectric material mixed before injection of the case 310, the thermosetting heat-resistant The ratio of the resin material or the magnetic material should be lowered. At this time, when the ratio of the thermosetting heat-resistant resin material is lowered, durability such as heat resistance of the case 310 exposed to high temperature may be weakened, and the ratio of the magnetic material may be reduced. In the case of lowering, since the filtration rate of the emitted noise is lowered, there is a problem that the attenuation efficiency of the noise is naturally lowered.

Therefore, when a larger capacitance is required, it is preferable to join the pipe 370 provided as an electrode of the dielectric therein.

In addition, the cap 320 coupled to the lower portion of the case 310 has an insertion protrusion 324 having a binding hole coupling groove 323 in the center thereof is formed vertically, the insertion protrusion 324 is the case 310 It has a diameter corresponding to the inner diameter of the hole of the projection insertion portion 314 formed in the center portion. In addition, a coupling protrusion 322 is formed around the upper end of the cap 320, and the coupling protrusion 322 is fitted into the coupling groove 312 of the case 310 as described above.

Cap 320 having such a configuration is excellent in the high-frequency band of amorphous and / or ferrite-based heat-resistant resin material with excellent insulation properties of PP, PBT or PET material. Magnetic materials having a mixture are mixed and manufactured by injection molding.

In this case, the mixing ratio of the heat-resistant resin material and the amorphous and / or ferritic magnetic material is 20 to 80 parts by weight of the amorphous and / or ferritic magnetic material based on a total of 100 parts by weight, the heat-resistant resin material 60 to It is preferable to make it as 80 weight part.

In addition, the cap 320 may be manufactured by mixing a conductive carbon black material with a heat-resistant resin material having excellent insulation properties of PP, PBT or PET.

In this case, the mixing ratio of the heat-resistant resin material and the conductive carbon black material is preferably mixed at about 20 to 40 parts by weight of the heat-resistant resin material in a state where the ferroelectric material is mixed.

The ratio of the magnetic material or the conductive carbon black material is increased according to the limit of noise, the higher the limit, the lower the limit, the lower the content is mixed, wherein the mixing ratio of the heat-resistant resin material is less than 60 parts by weight In the case of the case 310, as in the case 310, the cap 320 is also exposed to high temperature, so if the durability is weak, such as heat resistance may cause problems, so the mixing ratio of at least heat-resistant resin material is mixed at least 60 parts by weight It is desirable to be.

The cap 320 is coupled to the cap insertion portion 311 in a state where the insertion protrusion 324 formed at the bottom of the case 310 is fitted to the protrusion insertion portion 314.

The ground bracket 330 has a binding hole insertion hole 333 formed at the center of the coupling portion 331 inserted into and coupled to the bracket insertion portion 313, and the electrode insertion portion at both sides of the binding hole insertion hole 333. A case insertion hole 332 into which the 315 is fitted is formed.

The ground bracket 330 is mounted to the upper bracket insertion portion 313 of the case 310 while the electrode insertion portion 315 is fitted to the case insertion hole 332, and the binding hole insertion hole 333 is provided. Through the binding hole 390 is fitted into the binding hole coupling groove 323 is integrally coupled.

In this case, as described above, the pipe 370 may be mounted to the dielectric space 316 formed around the internal electrode inserting portion 315 of the case 310.

In the dielectric space 316, if the magnetic rate needs to be increased, that is, if the noise limiting standard is defined higher and the generation rate of noise is to be suppressed lower, the case 310 is mixed with the case 310. When the ratio of the magnetic material does not sufficiently satisfy the noise limiting specification, the upserver 380 may be mounted on the lower and / or upper portion of the pipe 370 provided to the electrode of the dielectric. The upserver 380 is preferably made of a ferrite and / or amorphous magnetic material.

In addition, the insulating tube 360 is mounted to the electrode insertion part 315 protruding from the case 310 to the outside of the bracket insertion part 313. The insulating tube 360 is coupled to maintain the discharge preventing distance performed by the conventional discharge case, conventionally had to form a coupling structure for the mounting of the discharge chamber, the insulating tube 360 as in the present invention When used, it can be manufactured by a simple design to have a diameter that can be simply fitted to the electrode insert 315.

The condenser 300 as described above is assembled in the same order as shown in FIG. 321 is inserted, the energizing electrode 340 is fitted to the electrode insertion portion 315, at the same time the insertion protrusion 324 is fitted to the projection insertion portion 314 so that the cap 320 is the lower portion of the case 310 It is coupled to the cap inserting portion 311.

Thereafter, the pipe 370 provided as the upserver 380 and / or the electrode of the dielectric is inserted into the dielectric space 316 of the case 310 according to the design specification, and the case insertion opening 332 of the ground bracket 330 is inserted. Is inserted into the electrode insertion portion 315 of the case 310 and coupled to the upper bracket insertion portion 313 of the case 310.

Binding hole coupling formed at the end of the insertion projection 324 through the binding hole insertion hole 333 of the ground bracket 330 so that the ground bracket 330 and the cap 320 is coupled to the upper and lower portions of the case 310 The ground bracket 330, the case 310, and the cap 320 are integrally coupled to the groove 323. After that, the insulating tube 360 is inserted into the electrode insertion part 315 to be coupled to each other, and the choke coil 210 is connected to the end of the conducting electrode 340.

In another embodiment of the present invention, the filter portion for attenuating the noise caused by the action of the condenser 300 and the choke coil 210 is separated from the cathode portion of the magnetron to filter the electrons flowing back from the magnetron. In the manufacture of the discharge protection tool 400 to be mounted is prepared by mixing the amorphous and / or ferritic magnetic material with a ceramic material. In this case, the mixing ratio is preferably prepared by mixing about 80 to 90 parts by weight of the ceramic material and 10 to 20 parts by weight of the amorphous magnetic material and / or the ferritic magnetic material when the total weight ratio is 100.

In more detail, since the position of the discharge preventing device 400 is located at the cathode of the magnetron, very high heat is directly transmitted. Therefore, when the ceramic material is lowered to 80 parts by weight or less, the durability may be affected and the internal vacuum of the magnetron may be affected. Therefore, it is preferable to maintain the ratio of the ceramic material to 80 parts by weight or more. Do.

In order to better solve such a problem, the terminal of the magnetron (not shown) is shown in a circular plate as shown in FIG. 6 in the groove of the conventional discharge preventing device 11 made of a ceramic material coupled to the cathode of the magnetron. ) May be coupled to the noise attenuating member 410, the insertion hole 411 can be penetrated. At this time, the noise damping agent 410 is made of an amorphous and / or ferrite-based magnetic material.

Here, the noise attenuating agent 410 made of amorphous and / or ferritic magnetic materials may be coupled together to the discharge preventing device 400 in which the amorphous and / or ferritic magnetic materials are mixed as described above. It may be.

According to the present invention as described above, in order to attenuate the noise generated by the noisy electron energy emitted from the magnetron, the function of the condenser is improved independently of the action of the choke coil to be self-saturated by the heat generated by the choke coil. Due to the deterioration of the filter function, even when noise is generated, the capacitor itself absorbs and / or shields noise that leaks to the outside, thereby effectively attenuating the noise.

The present invention has the advantage that it is easy to manufacture and the production time can be shortened because the composition of the dielectric can be formed without performing the molding process.

In addition, the present invention has the advantage that it is possible to maintain the noise filter performance more efficiently because it can attenuate the radioactive noise emitted at the cathode portion of the magnetron to the primary to extend the time for the choke coil to self-saturate.

Claims (10)

A cap inserting portion 311 having a coupling groove 312 is formed at one end, a bracket inserting portion 313 is formed at the other end, and has a hole penetrating from the end where the cap inserting portion 311 is formed. A case 310 in which the protrusion inserting portion 314 and the electrode inserting portion 315 having the through hole extend to form a dielectric space 316 at regular intervals; A cap 320 in which an insertion protrusion 324 having a binding hole coupling groove 323 is formed vertically in a central portion thereof, and a coupling protrusion 322 is formed along the upper periphery; A coupling part 331 is formed to be inserted into the bracket insertion part 313 and coupled thereto, and a binding hole insertion hole 333 is formed at the center thereof, and case insertion holes 332 are formed at both sides of the binding hole insertion hole 333. A grounding bracket 330; A conducting electrode 340 inserted into the electrode insertion part 315; A terminal 350 having one end connected to the conducting electrode 340 while penetrating through the cap 320; A binding hole 390 that is fastened to the binding hole coupling groove 323 through the binding hole insertion hole 333 to integrally couple the ground bracket 330, the case 310, and the cap 320 to each other; And a condenser, a choke coil, and a discharge prevention device 400, each comprising an insulating tube 360 coupled to the electrode inserting portion 315 protruding to the outside of the bracket inserting portion 313 to prevent noise attenuation of the magnetron. In the noise removing filter mounted to the cathode for The discharge preventing device 400 is formed with an insertion hole 411 in the circular plate, characterized in that the noise damping effector 410 that combines any one or two of amorphous, ferrite-based magnetic material is coupled Magnetron with improved noise filter. The method of claim 1, wherein the case 310 is a dielectric material is mixed with 5 to 50 parts by weight of the heat-resistant resin material having an insulating property, any one or two of the amorphous or ferritic magnetic material in the mixed state A magnetron having an improved noise filter, characterized by mixing 10 to 20 parts by weight of species. The method of claim 1, wherein the cap 320 is any one or a mixture of amorphous, ferritic magnetic material, or any one of conductive carbon black materials, 60 to 80 parts by weight of the heat-resistant resin material having an insulating property Magnetron having an improved noise filter, characterized in that consisting of 20 to 40 parts by weight. delete 4. Magnetron with improved noise filter according to any one of the preceding claims, characterized in that the dielectric space (316) is coupled with a pipe (370) provided as an electrode of the dielectric. The upserver 380 of claim 5, wherein the dielectric space 316 comprises a ferrite-based, amorphous-based one or a mixture of two or more of the pipes 370 provided as an electrode of the dielectric. And a magnetron having an improved noise filter. The method of claim 1, wherein the discharge prevention device 400 is characterized by consisting of 10 to 20 parts by weight of any one or two of the amorphous or ferritic magnetic material to about 80 to 90 parts by weight of a ceramic material Magnetron with improved noise filter. delete In the manufacturing method of the capacitor mounted to the noise canceling filter for magnetron, The capacitor is made of a capacitor having the configuration of claim 1, wherein the case 310 is 5 to 50 parts by weight of a dielectric material is mixed with a heat-resistant resin material having an insulating property, in the amorphous state, ferrite-based After mixing any one or two of the magnetic materials is prepared by injection molding through stirring 10 to 20 parts by weight, Cap 320 is 20 to 40 weight after using any one or a mixture of amorphous, ferrite-based magnetic material, or conductive carbon black material to 60 to 80 parts by weight of the heat-resistant resin material having an insulating property Method for producing a magnetron having an improved noise filter, characterized in that the part is manufactured by injection molding through stirring. delete

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