CN112786410A

CN112786410A - Magnetron filtering component, magnetron and household appliance

Info

Publication number: CN112786410A
Application number: CN202011613449.7A
Authority: CN
Inventors: 刘洪颐; 罗良敏; 张昀; 邱炳兴; 施志雄; 王贤友; 唐相伟; 侯俊峰
Original assignee: Midea Group Co Ltd; Guangdong Midea White Goods Technology Innovation Center Co Ltd
Current assignee: Midea Group Co Ltd; Guangdong Midea White Goods Technology Innovation Center Co Ltd
Priority date: 2020-12-30
Filing date: 2020-12-30
Publication date: 2021-05-11
Anticipated expiration: 2040-12-30
Also published as: CN112786410B

Abstract

The application relates to the technical field of magnetrons and discloses a magnetron filtering component, a magnetron and a household appliance. The magnetron filtering component comprises a shielding box and a feedthrough capacitor component; wherein, the cathode terminal of the magnetron is arranged at the bottom of the shielding box in a penetrating way, and one end of the cathode terminal is connected with the cathode of the magnetron; the feedthrough capacitor assembly penetrates through the side wall of the shielding box and comprises a lead-out wire led out into the shielding box and a cathode wire led out of the shielding box, one end of the lead-out wire is connected with the other end of the cathode wiring terminal, the other end of the lead-out wire is connected with the cathode wire, and the cathode wire is used for being connected with an external power supply; wherein, the cathode wire is arranged in a coil shape. Through the mode, the size of the magnetron can be reduced.

Description

Magnetron filtering component, magnetron and household appliance

Technical Field

The application relates to the technical field of magnetrons, in particular to a magnetron filtering component, a magnetron and a household appliance.

Background

The magnetron is a vacuum electron tube for generating microwave, and the common filter device used in the magnetron at present consists of a shielding box and a filter component arranged in the shielding box, wherein the shielding box is a metal box for shielding, and the filter component is formed by connecting a capacitor and an inductor. The filtering device can effectively prevent noise transmitted from the terminal of the vacuum tube from propagating along the power supply line or radiating outside the shielding box.

Because of the working characteristics of the magnetron, when the magnetron works normally, negative high voltage is connected to the filtering component of the magnetron, and in order to prevent sparking between the filtering component and the shielding component, the relative distance between the filtering component and the shielding component needs to be ensured during design. With the continuous upgrade of the magnetron and the miniaturization requirement of the household microwave oven, the size of the magnetron is gradually developing towards miniaturization, so the size optimization of the shielding component is also very important.

Disclosure of Invention

The technical problem that this application mainly solved provides magnetron filtering subassembly, magnetron and domestic appliance, can reduce the volume of magnetron.

A technical solution adopted by the present application is to provide a magnetron filtering assembly, including: the cathode terminal of the magnetron penetrates through the bottom of the shielding box, and one end of the cathode terminal is connected with the cathode of the magnetron; the feedthrough capacitor assembly penetrates through the side wall of the shielding box and comprises a lead-out wire led out into the shielding box and a cathode wire led out of the shielding box, one end of the lead-out wire is connected with a cathode wiring terminal, the other end of the lead-out wire is connected with the cathode wire, and the cathode wire is used for being connected with an external power supply; wherein, the cathode wire is arranged in a coil shape.

The cathode terminal comprises a first cathode terminal and a second cathode terminal, and the first cathode terminal and the second cathode terminal are respectively connected with two ends of the cathode; the lead-out wire includes first lead-out wire and second lead-out wire, and first cathode connection end is connected to the one end of first lead-out wire, and the second cathode connection end is connected to the one end of second lead-out wire.

The cathode lines comprise a first cathode line and a second cathode line, one end of the first cathode line is connected with the other end of the first outgoing line, and one end of the second cathode line is connected with the other end of the second cathode terminal; the first cathode wire and the second cathode wire are twisted in pairs and are arranged in a coil shape.

The cathode lines further comprise third cathode lines, and the third cathode lines are grounded; the first cathode wire, the second cathode wire and the third cathode wire are twisted in a coil shape.

Wherein, the feedthrough capacitor assembly further comprises: the inner shell is arranged in the shielding box to form a first accommodating cavity; the outer shell is arranged outside the shielding box and forms a second accommodating cavity; one end of the first capacitor is connected with the first cathode wire, and the other end of the first capacitor is grounded; and one end of the second capacitor is connected with the second cathode wire, and the other end of the second capacitor is grounded.

The magnetron filtering component also comprises a consumption medium which is sleeved on the cathode terminal and is used for consuming the electromagnetic waves along the cathode terminal, or the consumption medium is sleeved on the outgoing line and is used for consuming the electromagnetic waves along the outgoing line.

Wherein, be provided with the magnetic core on the negative pole line, the magnetic core wears to locate the accommodation space that is the negative pole line of coiled setting.

Wherein, the magnetron filtering component also comprises a choke coil, one end of the choke coil is connected with the other end of the cathode terminal; one end of the leading-out wire is connected with the other end of the choking coil, and the other end of the leading-out wire is connected with the cathode wire.

Another technical solution adopted by the present application is to provide a magnetron including: a magnetron main body; the magnetron filtering component is arranged on the magnetron main body and used for consuming electromagnetic waves transmitted from the magnetron main body, and the magnetron filtering component is provided according to the technical scheme.

Another technical solution adopted by the present application is to provide a household appliance including a magnetron, the magnetron being as provided in the above technical solution.

The beneficial effect of this application is: in contrast to the state of the art, a magnetron filter assembly of the present application includes: the magnetron filtering assembly includes: the cathode terminal of the magnetron penetrates through the bottom of the shielding box, and one end of the cathode terminal is connected with the cathode of the magnetron; the feedthrough capacitor assembly penetrates through the side wall of the shielding box and comprises a lead-out wire led out into the shielding box and a cathode wire led out of the shielding box, one end of the lead-out wire is connected with a cathode wiring terminal, the other end of the lead-out wire is connected with the cathode wire, and the cathode wire is used for being connected with an external power supply; wherein, the cathode wire is arranged in a coil shape. In this way, the magnetron filtering component sets the cathode wire into a coil shape, so that the LC resonance circuit formed by the feedthrough capacitor component and the coil-shaped cathode wire suppresses and consumes high-frequency electromagnetic waves generated by the magnetron, filtering can be realized without setting a choke coil in the shielding box, the material cost for manufacturing the choke coil can be saved, on the other hand, when the volume of the shielding box is set, the problem that the distance between the choke coil and the shielding box is required to be ensured because the phenomenon of discharge ignition can occur between the choke coil and the shielding box is not required to be considered, the volume of the shielding box can be reduced, and finally, the volume of the magnetron is reduced.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts. Wherein:

FIG. 1 is a schematic structural diagram of an embodiment of a magnetron filter assembly provided herein;

FIG. 2 is a schematic structural diagram of another embodiment of a magnetron filtering assembly provided by the present application;

FIG. 3 is a schematic structural diagram of another embodiment of a magnetron filtering assembly provided by the present application;

FIG. 4 is a schematic structural diagram of another embodiment of a magnetron filtering assembly provided by the present application;

FIG. 5 is a schematic structural diagram of another embodiment of a magnetron filtering assembly provided by the present application;

FIG. 6 is a schematic structural diagram of another embodiment of a magnetron filtering assembly provided by the present application;

FIG. 7 is a schematic structural diagram of another embodiment of a magnetron filtering assembly provided by the present application;

FIG. 8 is a schematic structural diagram of another embodiment of a magnetron filtering assembly provided by the present application;

FIG. 9 is a schematic diagram of an embodiment of the consumable media of FIG. 8 provided herein;

FIG. 10 is a schematic structural diagram of an embodiment of a magnetron provided herein;

fig. 11 is a schematic structural diagram of an embodiment of a household appliance provided by the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. It should be further noted that, for the convenience of description, only some of the structures related to the present application are shown in the drawings, not all of the structures. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

In the technical field of magnetrons, electromagnetic waves generated by an emission cavity of a magnetron are mainly required fundamental waves (2450MHz) and also electromagnetic waves of other frequencies (including a second high-frequency harmonic (4900MHz), a third high-frequency harmonic (7350MHz), a fourth high-frequency harmonic (9.8GHz), a fifth high-frequency harmonic (12.5GHz) and the like), one part enters a designated working area such as a cooking chamber of a microwave oven through an antenna, and the other part leaks outwards along the directions of a central lead and a side lead entering the emission cavity to generate electromagnetic wave interference on surrounding devices to become disturbance waves. In order to reduce the external leakage of the disturbance waves along the direction of the central lead and the side lead, in the related technology, the central lead and the side lead pass through the shielding cavity and then enter the transmitting cavity, the shielding cavity adopts a choke coil and a feedthrough capacitor to form a resonance system, and the disturbance waves introduced from the transmitting cavity can be partially eliminated by utilizing a shielding shell of the shielding cavity.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of a magnetron filtering assembly provided in the present application. As shown in fig. 1, the magnetron filter assembly 10 includes a shield case 11, a choke coil 12, and a feedthrough capacitor 13. Wherein, a choke coil 12 is provided in the shield case 11, and one end of the choke coil 12 is connected to a cathode terminal 14 of the magnetron. The feedthrough capacitor 13 is provided through a side wall of the shield case 11, and a lead wire of the feedthrough capacitor 13 is connected to the other end of the choke coil 12. Therefore, the circuit structure formed by the feedthrough capacitor 13 and the choke coil 12 filters the electromagnetic wave emitted from the magnetron.

As shown in fig. 1, the shield case 11 includes a first sidewall 111, a second sidewall 112, a third sidewall 113, and a fourth sidewall 114. The feedthrough capacitor 13 penetrates the first sidewall 111 of the shield case 11, where a distance between the first sidewall 111 and the third sidewall 113 is L, and a distance between the second sidewall 112 and the fourth sidewall 114 is M.

In the application of some household appliances (such as microwave ovens), the space occupancy rate of the inner cavity of the household appliance is small due to the overlarge volume of the magnetron, and the overlarge volume of the shielding box body is an important reason for the difficulty in reducing the volume of the magnetron. Based on this, the following examples are proposed:

referring to fig. 2, fig. 2 is a schematic structural diagram of another embodiment of a magnetron filtering component provided in the present application. The magnetron filter assembly 20 includes a shield can 21 and a feedthrough capacitor assembly 22.

The inside of the shielding box 21 is a receiving cavity for receiving a part of the feedthrough capacitor assembly 22.

The magnetron filter assembly 20 is disposed on a magnetron body including a cathode terminal 23 and a cathode, the cathode terminal 23 is led out from the magnetron body and penetratingly disposed at the bottom of the shield case 21, and one end of the cathode terminal 23 is connected to the cathode. The cathode terminal 23 penetrates the bottom of the shield case 21, and the other end is disposed in the accommodation chamber of the shield case 21.

The feedthrough capacitor assembly 22 is arranged on the side wall of the shielding box 21 in a penetrating manner, the feedthrough capacitor assembly 22 comprises a lead-out wire 221 led out of the shielding box 21 and a cathode wire 222 led out of the shielding box 21, one end of the lead-out wire 221 is connected with the other end of the cathode terminal 23, the other end of the lead-out wire 221 is connected with the cathode wire 222, and the cathode wire 222 is used for being connected with an external power supply; the cathode lines 222 are provided in a coil shape, and electromagnetic waves along the cathode lines 222 can be suppressed without increasing the cost. In some embodiments, the cathode line 222 disposed in the coil shape is provided with a magnetic core, and the magnetic core is disposed through the accommodating space of the cathode line 222 disposed in the coil shape. It is to be understood that the cathode wire 222 is an air-core coil when disposed in a coil shape, and a magnetic core coil when disposed. The core coil may be any one of a ferrite coil, an iron core coil, or a copper core coil.

Specifically, the cathode terminal 23 includes a first cathode terminal 231 and a second cathode terminal 232, and the first cathode terminal 231 and the second cathode terminal 232 are connected to both ends of the cathode, respectively.

Lead line 221 includes a first lead line 2211 and a second lead line 2212, one end of first lead line 2211 being connected to the other end of first cathode terminal 231, and one end of second lead line 2212 being connected to the other end of second cathode terminal 232.

The cathode line 222 includes a first cathode line 2221 and a second cathode line 2222, one end of the first cathode line 2221 is connected to the other end of the first lead-out line 2211, and one end of the second cathode line 2222 is connected to the other end of the second lead-out line 2212; first cathode line 2221 and second cathode line 2222 are twisted and arranged in a coil shape, and electromagnetic waves along cathode line 222 can be suppressed without increasing the cost. Specifically, the twisting period of the twisted pairs of the first cathode line 2221 and the second cathode line 2222 should be as dense as possible to improve the capability of suppressing the differential mode radiation interference.

In other embodiments, the first cathode line 2221 and the second cathode line 2222 are respectively disposed in a coil shape.

In the related art, the first cathode line and the second cathode line are long and have a large distance, so that the differential mode current loop area is large, resulting in strong differential mode radiation. Wherein, the cathode line has a differential mode noise current from the inside of the magnetron with opposite current direction. At this time, the area surrounded by the first cathode line and the second cathode line is large, so that the differential mode current on the cathode line radiates strong electromagnetic interference into the air, and the interference is called differential mode radiation of the magnetron. In the embodiment, after the first cathode line 2221 and the second cathode line 2222 are twisted, the area of the differential mode current loop is close to zero, so that the differential mode electromagnetic radiation is significantly reduced.

Further, the first cathode line 2221 and the second cathode line 2222 are twisted and arranged in a coil shape to form an air-core inductor and a feedthrough capacitor assembly 22, which constitute a filter, so as to suppress common mode noise current, thereby reducing common mode electromagnetic radiation. In the circuit including the magnetron, the magnetron filter 20, and the power supply, a common mode noise current having the same current direction from the inside of the magnetron exists on the cathode line. At this time, the loop formed by the first cathode line, the second cathode line and the ground line radiates strong electromagnetic interference into the air, and the interference is called common mode radiation of the magnetron.

In this way, the cathode lines 222 are arranged in a coil shape without increasing the cost, so that the impedance of the common mode loop is increased, the common mode radiation is reduced, the component parameters of the magnetron filter assembly 20 can be reduced, and the cost and the technical requirements of the magnetron filter assembly 20 are reduced.

Specifically, in fig. 2, the choke coil is omitted from fig. 1 and 2. When the sidewalls are provided, the distance between the first sidewall 211 and the third sidewall 213 decreases, i.e., the distance N between the first sidewall 211 and the third sidewall 213 in fig. 2 is smaller than the distance L between the first sidewall 111 and the third sidewall 113 in fig. 1; the distance between the second sidewall 212 and the fourth sidewall 214 decreases, i.e. the distance O between the second sidewall 212 and the fourth sidewall 214 in fig. 2 is smaller than the distance M between the second sidewall 112 and the fourth sidewall 114 in fig. 1. In this way, the first cathode line 2221 and the second cathode line 2222 are twisted into a coil without increasing the cost, so that electromagnetic waves can be suppressed, the material cost for manufacturing the choke coil can be reduced, and the volume of the shield case 21 can be reduced.

In the present embodiment, the magnetron filter module 20 forms the coil-shaped cathode wire 222 into the coil-shaped cathode wire 222, so that the feedthrough capacitor module 22 and the coil-shaped cathode wire 222 form an LC resonant circuit, and the high-frequency electromagnetic wave generated by the magnetron is suppressed and consumed, on one hand, under the condition that the cathode wire 222 can suppress the electromagnetic wave, filtering can be realized without providing a choke coil inside the shield box, and the material cost for manufacturing the choke coil can be saved, on the other hand, when the volume of the shield box 21 is set, the problem that the choke coil and the shield box 21 generate a phenomenon of discharge and ignition and the distance between the choke coil and the shield box 21 must be ensured does not need to be considered, and further, the volume of the shield box 21 can be reduced, and finally, the volume of the magnetron can.

Referring to fig. 3, fig. 3 is a schematic structural diagram of another embodiment of a magnetron filtering component according to the present application. The magnetron filter assembly 30 includes a shield case 31, a feedthrough capacitor assembly 32, and a dissipative medium 33.

Inside the shield case 31 is a housing chamber for housing a part of the feedthrough capacitor assembly 32 and the consumable medium 33.

The magnetron filter assembly 30 is disposed on a magnetron body including a cathode terminal 34 and a cathode, the cathode terminal 34 is led out from the magnetron body and penetratingly disposed at the bottom of the shield case 31, and one end of the cathode terminal 34 is connected to the cathode. The cathode terminal 34 penetrates the bottom of the shield case 31, and the other end is disposed in the accommodation chamber of the shield case 31.

The feedthrough capacitor assembly 32 is disposed through a sidewall of the shielding box 31, and a portion of the feedthrough capacitor assembly 32 is disposed in the accommodating cavity of the shielding box 31. The feedthrough capacitor assembly 32 includes an outgoing line 321 led out into the shield case 31 and a cathode line 322 led out of the shield case 31, the outgoing line 321 is connected to the cathode terminal 34, and one end of the cathode line 322 is connected to the outgoing line 321. As shown in fig. 3, the shield case 31 includes a first sidewall 311, a second sidewall 312, a third sidewall 313, and a fourth sidewall 314. The feedthrough capacitor assembly 32 is disposed through the first sidewall 311 of the shielding box 31, where a distance between the first sidewall 311 and the third sidewall 313 is N, and a distance between the second sidewall 312 and the fourth sidewall 314 is O.

The consuming medium 33 is sleeved on the outgoing line 321 and is used for consuming the electromagnetic waves along the outgoing line 321. Specifically, the cathode terminal 34 includes a first cathode terminal 341 and a second cathode terminal 343, and the first cathode terminal 341 and the second cathode terminal 342 are connected to both ends of the cathode of the magnetron, respectively. The lead line 321 includes a first lead line 3211 and a second lead line 3212, one end of the first lead line 3211 is connected to the first cathode terminal 341, and one end of the second lead line 3212 is connected to the second cathode terminal 342. Because the lead-out wire 321 is directly connected with the cathode terminal 34, the choke coil originally connecting the cathode terminal 34 and the lead-out wire 321 is omitted, and the space occupied by the choke coil in the shielding box 31 is released, so that when the volume of the shielding box 31 is set, the problem that the distance between the choke coil and the shielding box 31 must be ensured because the phenomenon of discharge and ignition can occur between the choke coil and the shielding box 31 is not considered, and the volume of the shielding box 31 can be reduced.

Specifically, the consumable medium 33 is provided with a first through hole and a second through hole, the first outgoing line 3211 penetrates the first through hole, and the second outgoing line 3213 penetrates the second through hole. At this time, the first and second outgoing lines 3211 and 3212 and the dissipative medium 33 form an inductance having both characteristics of a differential mode inductance and a common mode inductance, which can dissipate the electromagnetic waves along the outgoing line 321 when the magnetron filter assembly 30 is in operation.

The cathode line 322 includes a first cathode line 3221 and a second cathode line 3222, one end of the first cathode line 3221 is connected to the other end of the first outgoing line 3211, and one end of the second cathode line 3222 is connected to the other end of the second outgoing line 3212; first cathode line 3221 and second cathode line 3222 are twisted and arranged in a coil shape, and electromagnetic waves along cathode line 322 can be suppressed without increasing the cost. Specifically, the twist cycles of the twisted pairs of the first cathode lines 3221 and the second cathode lines 3222 should be as dense as possible to improve the ability to suppress differential mode radiation interference.

In this way, the whole magnetron filtering component 30 utilizes the LCL resonant circuit formed by the coil-shaped arrangement of the consumption medium 33 sleeved on the outgoing line 321, the feedthrough capacitor component 32 and the cathode wire 322 to suppress and consume the high-frequency electromagnetic wave generated by the magnetron, so that the filtering can be realized without arranging a choke coil inside the shielding box, and when the volume of the shielding box 31 is arranged, the problem that the distance between the choke coil and the shielding box 31 must be ensured because the phenomenon of discharge and ignition can occur between the choke coil and the shielding box 31 does not need to be considered, and the volume of the shielding box 31 can be reduced, and finally the volume of the magnetron is reduced.

Alternatively, the dielectric medium 33 may be a ferrite material composed of a NiCuZn-based ferrite material containing predetermined amounts of iron oxide, copper oxide, zinc oxide, and nickel oxide as a main component and bismuth oxide, silicon oxide, magnesium oxide, and cobalt oxide as auxiliary components. The expendable media 33 may also be an amorphous magnet. .

In other embodiments, the dissipative medium 33 can be made of various materials with high insulation, high magnetic permeability, and large magnetic loss. The consumable medium 33 may be annular or cylindrical, and the length and width of the consumable medium 33 may be adjusted accordingly.

In the case that a certain filtering condition is satisfied, the space occupied by the dissipative medium 33 and the feedthrough capacitor assembly 32 in the magnetron filtering assembly 30 of the present embodiment in the shield case 31 can be set as small as possible, so that the volume of the shield case 31 can be reduced accordingly. For example, in order to reduce the volume of the shield case 31, the expendable medium 33 having a large ability to absorb electromagnetic waves may be selected. Accordingly, since the cathode wire 322 is disposed outside the shield case 31, the cathode wire 322 can be selectively disposed as a coil having a larger electromagnetic wave absorbing ability to consume more electromagnetic waves, so that the burden of the consuming medium 33 can be reduced, and the volume of the consuming medium 33 can be reduced, so that the volume of the shield case 31 can be reduced accordingly.

Description of feedthrough capacitor assembly 32:

feedthrough capacitor assembly 32 further includes: an inner housing 323, an outer housing 324, a first capacitor (not shown), and a second capacitor (not shown). The inner housing 323 is disposed in the shield case 31 to form a first accommodation chamber; the outer housing 324 is disposed outside the shielding box 31 to form a second accommodating chamber; one end of the first capacitor is connected to the other end of the first cathode line 3221, and the other end of the first capacitor is grounded; one end of the second capacitor is connected to the other end of the second cathode line 3222, and the other end of the second capacitor is grounded. In this way, the space occupied by the inner housing 323 in the shield box 31 is reduced as much as possible to reduce the volume of the shield box 31. The consuming medium 33 may be partly embedded in the inner housing 323.

In some embodiments, in order to further reduce the volume of the shield case 31, the outer portion of the consumable medium 33 is attached to the inner case 323, the first and second lead lines 3211 and 3212 are attached to the inner sides of the first and second through holes of the consumable medium 33, and the consumable medium 33 is attached to the lead lines 321 when the volume of the lead lines 321 is constant, so that the volume of the consumable medium 33 and thus the volume of the inner case 323 can be controlled to the maximum extent, thereby reducing the volume of the shield case 31.

In addition, the consumption medium 33 made of ferrite material is adopted, and the consumption medium 33 serves as a part of a filter, so that the requirement for suppressing high-frequency interference of the magnetron filter assembly 30 is reduced, and the parameter selection of the magnetron filter assembly 30 has greater freedom, for example, in the embodiment, the normal level of filter processing can be performed without arranging a coil, and the volume of the shielding box 31 is reduced by eliminating the coil while the Electromagnetic Compatibility (EMC) performance of the magnetron is ensured, so that the volume of the magnetron is finally reduced, the phenomenon that the coil and the shielding box 31 are subjected to discharge ignition is avoided, and certain safety guarantee is provided. In addition, in the embodiment, the conventional coil is omitted, so that the problem that the turn-to-turn distances of the coils at two ends are different when the coil is provided with the hollow core section and the magnetic core section can be avoided, and the process procedure is simplified.

Specifically, in comparison with fig. 1 and 3, in the magnetron filter assembly 30 shown in fig. 3, after the choke coil 13 in fig. 1 is eliminated, the distance N between the first sidewall 311 and the third sidewall 313 in fig. 3 is smaller than the distance L between the first sidewall 111 and the third sidewall 113 in fig. 1, and the distance O between the second sidewall 312 and the fourth sidewall 314 is smaller than the distance M between the second sidewall 112 and the fourth sidewall 114 in fig. 1, so that the volume of the whole shield case 31 is reduced. In other embodiments, the height of the shield case 31 can be reduced accordingly because the choke coil is eliminated. And the volume of the entire shield can 31 is reduced.

In the present embodiment, the magnetron filter assembly 30 suppresses and consumes the high-frequency electromagnetic waves generated by the magnetron by using the LCL resonant circuit formed by the coil-shaped arrangement of the dissipative medium 33, the feedthrough capacitor assembly 32, and the cathode wire 322, which are sleeved on the outgoing line, so that the filtering can be realized without arranging the choke coil inside the shield case, and thus, when the volume of the shield case 31 is set, the problem that the choke coil and the shield case 31 are discharged and ignited and the distance between the choke coil and the shield case 31 must be ensured does not need to be considered, and the volume of the shield case 31 can be reduced, and finally, the volume of the magnetron can be reduced. And by eliminating the choke coil and reducing the volume of the shield case 31, the material for manufacturing the choke coil and the shield case 31 can be saved accordingly, and the production cost of the magnetron filter assembly 30 can be reduced.

Referring to fig. 4, fig. 4 is a schematic structural diagram of another embodiment of a magnetron filtering assembly provided in the present application, and the magnetron filtering assembly 40 provided in the present embodiment includes a shielding box 41, a feedthrough capacitor assembly 42, and a dissipative medium 43.

Inside the shield case 41 is a housing chamber for housing a portion of the feedthrough capacitor assembly 42 and the consumable medium 43.

The magnetron filter assembly 40 is disposed on a magnetron body including a cathode terminal 44 and a cathode, the cathode terminal 44 is led out from the magnetron body and penetratingly disposed at the bottom of the shield case 41, and one end of the cathode terminal 44 is connected to the cathode. The cathode terminal 44 penetrates the bottom of the shield case 41, and the other end is disposed in the accommodation chamber of the shield case 41.

The feedthrough capacitor assembly 42 is disposed through a sidewall of the shielding box 41, and a part of the feedthrough capacitor assembly 42 is disposed in the accommodating cavity of the shielding box 41. The feedthrough capacitor assembly 42 includes an outgoing line 421 led out into the shield case 41 and a cathode line 422 led out from the shield case 41, the outgoing line 421 is connected to the cathode terminal, and one end of the cathode line 422 is connected to the outgoing line 421. As shown in fig. 4, the shield case 41 includes a first sidewall 411, a second sidewall 412, a third sidewall 413, and a fourth sidewall 414. The feedthrough capacitor assembly 42 is disposed through the first sidewall 411 of the shielding box 41, where a distance between the first sidewall 411 and the third sidewall 413 is P, and a distance between the second sidewall 412 and the fourth sidewall 414 is Q.

The consumption medium 43 is sleeved on the cathode terminal 44 for consuming the electromagnetic waves along the cathode terminal 44. Specifically, the cathode terminal 44 includes a first cathode terminal 441 and a second cathode terminal 442, and the first cathode terminal 441 and the second cathode terminal 442 are connected to both ends of the cathode of the magnetron, respectively. The expendable medium 43 is provided with a through hole through which the first cathode terminal 441 and the second cathode terminal 442 are passed.

In other embodiments, the consuming medium 43 is provided with a third through hole through which the first cathode terminal 441 is disposed and a fourth through hole through which the second cathode terminal 442 is disposed. At this time, the first and second cathode terminals 441 and 442 form an inductor with the dissipative medium 43, and the inductor has both characteristics of differential mode inductance and common mode inductance, and can dissipate electromagnetic waves along the cathode terminal 44 when the magnetron filter assembly 40 is in operation.

Specifically, the lead line 421 includes a first lead line 4211 and a second lead line 4212, one end of the first lead line 4211 is connected to the first cathode terminal 441, and one end of the second lead line 4212 is connected to the second cathode terminal 442. Because the lead-out wire 421 is directly connected to the cathode terminal 44, the choke coil originally connecting the cathode terminal 44 and the lead-out wire 421 is eliminated, and the space occupied by the choke coil in the shielding box 41 is released, so that when the volume of the shielding box 41 is set, the problem that the distance between the choke coil and the shielding box 41 needs to be ensured because the phenomenon of discharge and ignition can occur between the choke coil and the shielding box 41 is not considered, and the volume of the shielding box 41 can be reduced.

The cathode lines 422 include a first cathode line 4221 and a second cathode line 4222, one end of the first cathode line 4221 is connected with the other end of the first outgoing line 4211, and one end of the second cathode line 4222 is connected with the other end of the second outgoing line 4212; first cathode line 4221 and second cathode line 4222 are twisted and arranged in a coil shape, and electromagnetic waves along cathode line 422 can be suppressed without increasing the cost. Specifically, the twist cycles of the twisted pairs of the first cathode wires 4221 and the second cathode wires 4222 should be as dense as possible to improve the ability to suppress the differential mode radiation interference.

In this way, the whole magnetron filter assembly 40 utilizes the LCL resonant circuit formed by the consumption medium 43 sleeved on the cathode terminal 44, the feedthrough capacitor assembly 42 and the cathode wire 422 in a coil shape to suppress and consume the high-frequency electromagnetic waves generated by the magnetron, so that the filtering can be realized without arranging a choke coil inside the shielding box 41, and when the volume of the shielding box 41 is arranged, the problem that the choke coil and the shielding box 41 have the phenomenon of discharge and ignition and the distance between the choke coil and the shielding box 41 must be ensured is not considered, and the volume of the shielding box 41 can be reduced, and finally the volume of the magnetron is reduced.

Specifically, in comparison with fig. 1 and 4, in the magnetron filter assembly 40 shown in fig. 4, after the choke coil 12 in fig. 1 is eliminated, the distance P between the first sidewall 411 and the third sidewall 413 in fig. 4 is smaller than the distance L between the first sidewall 111 and the third sidewall 113 in fig. 1, and the distance Q between the second sidewall 412 and the fourth sidewall 414 is smaller than the distance M between the second sidewall 112 and the fourth sidewall 114 in fig. 1, so that the volume of the whole shield case 41 is reduced. In other embodiments, the height of the shield case 41 can be reduced accordingly because the choke coil is eliminated. And the volume of the entire shield case 41 is reduced.

In a practical scenario, when the magnetron filtering assembly 40 is powered on, the cathode in the magnetron emits thermal electrons at a temperature of about 2000K, the thermal electrons rotate in the action space thereof, so as to generate an electric field of about 2440MHZ, the thermal electrons become harmonics under the action of the electric field and the magnetic field in the action space, and the harmonics are emitted to the outside through the antenna, not only a fundamental wave for cooking but also a high-frequency harmonic of integral multiple of the fundamental wave frequency are generated in the action space, and for the part of the high-frequency harmonic, usually through the cathode terminal 44 connected to the cathode, the radiation is performed to the outside space through the consumption medium 43, and after the material (such as ceramic) originally sleeved on the cathode terminal 44 is replaced by the consumption medium 43, the consumption medium 43 is equivalent to a cathode insulation support column, that is equivalent to adding a low pass filter to the cathode terminal 44, the low-pass filter can inhibit the interference of high-frequency electromagnetic waves led out from the cathode terminal 44, meanwhile, the ferrite material can play a role in shielding consumption due to the property of the material, the component of high-frequency interference penetrating the consumption medium 43 to radiate to the space is reduced, the effect of filtering from the source is achieved, and the filtering effect is more stable.

Referring to fig. 5, fig. 5 is a schematic structural diagram of another embodiment of a magnetron filtering component according to the present application. The magnetron filter assembly 50 provided in the present embodiment includes a shield case 51, a feedthrough capacitor assembly 52, and a dissipative medium 53.

Inside the shield box 51 is a receiving cavity for receiving a portion of the feedthrough capacitor assembly 52, the lossy dielectric 53, and the insulating support posts 54 of the magnetron.

The magnetron filter assembly 50 is disposed on a magnetron body including a cathode terminal 55, a cathode and an insulating support column 54, the cathode terminal 55 is led out from the magnetron body and penetratingly disposed at the bottom of the shield case 51, and one end of the cathode terminal 55 is connected to the cathode. The cathode terminal 55 penetrates the bottom of the shield case 51, and the other end is disposed in the accommodation chamber of the shield case 51. Specifically, the cathode terminal 55 is disposed through the insulating support column 54.

The feedthrough capacitor assembly 52 is disposed through a sidewall of the shielding box 51, and a part of the feedthrough capacitor assembly 52 is disposed in the receiving cavity of the shielding box 51. The feedthrough capacitor assembly 52 includes a lead wire 521 led out into the shield case 51 and a cathode wire 522 led out of the shield case 51, the lead wire 521 is connected to the cathode terminal 55, and one end of the cathode wire 522 is connected to the lead wire 521. As shown in fig. 5, the shield case 51 includes a first sidewall 511, a second sidewall 512, a third sidewall 513, and a fourth sidewall 514. The feedthrough capacitor assembly 52 is disposed through the first sidewall 511 of the shielding box 51, where a distance between the first sidewall 511 and the third sidewall 513 is R, and a distance between the second sidewall 512 and the fourth sidewall 514 is S.

The consumption medium 53 is sleeved on the insulating support column 54, the insulating support column 54 is sleeved on the cathode terminal 55, and the consumption medium 53 is used for consuming electromagnetic waves along the cathode terminal 55 penetrating through the insulating support column 54. Specifically, the cathode terminal 55 includes a first cathode terminal 551 and a second cathode terminal 552, and the first cathode terminal 551 and the second cathode terminal 552 are respectively connected to both ends of the cathode of the magnetron. The insulating support column 54 is provided with a through hole through which a first cathode terminal 551 and a second cathode terminal 552 are inserted.

At this time, the first cathode terminal 551, the second cathode terminal 552 and the dissipative medium 53 form an inductance that dissipates electromagnetic waves along the cathode terminal 55 when the magnetron filter assembly 50 is in operation.

Specifically, the lead lines 521 include a first lead line 5211 and a second lead line 5212, one end of the first lead line 5211 being connected to the first cathode terminal 551, and one end of the second lead line 5212 being connected to the second cathode terminal 552. Because the lead wire 521 is directly connected with the cathode terminal 55, the choke coil originally connecting the cathode terminal 55 and the lead wire 521 is omitted, and the space occupied by the choke coil in the shielding box 51 is released, so that when the volume of the shielding box 51 is set, the problem that the distance between the choke coil and the shielding box 51 needs to be ensured because the phenomenon of discharge and ignition can occur between the choke coil and the shielding box 51 does not need to be considered, and the volume of the shielding box 51 can be reduced.

The cathode line 522 is disposed in a coil shape and is connected to a power source for consuming electromagnetic waves along the cathode line 522. Specifically, the cathode lines 522 include a first cathode line 5221 and a second cathode line 5222, one end of the first cathode line 5221 being connected to the other end of the first outlet line 5211, and one end of the second cathode line 5222 being connected to the other end of the second outlet line 5212. The first cathode line 5221 and the second cathode line 5222 are twisted and arranged in a coil shape.

Specifically, in comparison with fig. 1 and 5, in the magnetron filter assembly 50 shown in fig. 5, after the choke coil 12 in fig. 1 is eliminated, the distance R between the first sidewall 511 and the third sidewall 513 in fig. 5 is smaller than the distance L between the first sidewall 111 and the third sidewall 113 in fig. 1, and the distance S between the second sidewall 512 and the fourth sidewall 514 is smaller than the distance M between the second sidewall 112 and the fourth sidewall 114 in fig. 1, so that the volume of the whole shield case 51 is reduced. In other embodiments, the height of the shield case 51 can be reduced accordingly because the choke coil is eliminated. And thus the volume of the entire shield case 51 is reduced.

In this way, the whole magnetron filter assembly 50 utilizes the consumption medium 53 sleeved on the insulating support column 54 of the magnetron, the feedthrough capacitor assembly 52, the first cathode line 5221 and the second cathode line 5222 twisted and formed into a coil-shaped LCL resonant circuit to suppress and consume the high-frequency electromagnetic waves generated by the magnetron, so that the filtering can be realized without arranging a choke coil inside the shielding box 51, and when the volume of the shielding box 51 is set, the problem that the choke coil and the shielding box 51 have the phenomenon of discharge and ignition and the distance between the choke coil and the shielding box 51 must be ensured is not considered, and the volume of the shielding box 51 can be reduced, and finally the volume of the magnetron is reduced.

Referring to fig. 6, fig. 6 is a schematic structural diagram of another embodiment of a magnetron filtering component according to the present application. The magnetron filter assembly 60 includes a shield case 61, a choke coil 62, and a feedthrough capacitor assembly 63.

Inside the shield case 61 is a housing chamber for housing the choke coil 62 and the partial feedthrough capacitor assembly 63.

The magnetron filter assembly 60 is disposed on a magnetron body including a cathode terminal 64 and a cathode, the cathode terminal 64 is drawn out from the magnetron body and penetratingly disposed at the bottom of the shield case 61, and one end of the cathode terminal 64 is connected to the cathode. The cathode terminal 64 penetrates the bottom of the shield case 61, and the other end is disposed in the receiving cavity of the shield case 61.

The choke coil 62 is provided in the shield case 61, and one end of the choke coil 62 is connected to the other end of the cathode terminal 64.

The feedthrough capacitor assembly 63 penetrates through the side wall of the shielding box 61, the feedthrough capacitor assembly 63 comprises a lead-out line 631 led out into the shielding box 61 and a cathode line 632 led out of the shielding box 61, one end of the lead-out line 631 is connected with the other end of the choke coil 62, the other end of the lead-out line 631 is connected with the cathode line 632, and the cathode line 632 is used for connecting an external power supply; the cathode line 632 is provided in a coil shape, and electromagnetic waves along the cathode line 632 can be suppressed without increasing the cost. In some embodiments, the coil-shaped cathode line 632 is provided with a magnetic core, and the magnetic core is inserted into the accommodating space of the coil-shaped cathode line 632. It is to be understood that the cathode wire 632 is an air core coil when disposed in a coil shape, and a magnetic core coil when disposed. The core coil may be any one of a ferrite coil, an iron core coil, or a copper core coil.

Specifically, the cathode terminal 64 includes a first cathode terminal 641 and a second cathode terminal 642, and the first cathode terminal 641 and the second cathode terminal 642 are connected to both ends of the cathode, respectively.

The choke coil 62 includes a first choke coil 261 and a second choke coil 622, one end of the first choke coil 261 being connected to the first cathode terminal 641, and one end of the second choke coil 622 being connected to the second cathode terminal 642.

The lead line 631 includes a first lead line 6311 and a second lead line 6312, one end of the first lead line 6311 being connected to the other end of the first choke coil 261, and one end of the second lead line 6312 being connected to the other end of the second choke coil 622.

The cathode line 632 includes a first cathode line 6321 and a second cathode line 6322, one end of the first cathode line 6321 is connected to the other end of the first extraction line 6311, and one end of the second cathode line 6322 is connected to the other end of the second extraction line 6312; first cathode line 6321 and second cathode line 6322 are twisted and arranged in a coil shape, and electromagnetic waves along cathode line 632 can be suppressed without increasing the cost. Specifically, the twist cycles of the twisted pairs of the first cathode line 6321 and the second cathode line 6322 should be as dense as possible to improve the capability of suppressing the differential mode radiation interference.

In other embodiments, the first and

second cathode lines

6321 and 6322 are respectively disposed in a coil shape.

In some embodiments, the cathode line 632 further comprises a third cathode line, the third cathode line being grounded; among them, the first cathode line 6321, the second cathode line 6322, and the third cathode line are triple twisted and arranged in a coil shape. Electromagnetic waves along the cathode line 632 can be suppressed without increasing the cost.

In the related art, the first cathode line and the second cathode line are longer and have a larger distance, so that the differential mode current loop area is large, resulting in stronger differential mode radiation, whereas after the first cathode line 6321 and the second cathode line 6322 are twisted, the differential mode current loop area is close to zero, so that the differential mode electromagnetic radiation is significantly reduced. The cathode line 632 has a differential mode noise current from the inside of the magnetron in the opposite direction. At this time, when the area surrounded by the first cathode line 6321 and the second cathode line 6322 is large, the differential mode current on the cathode line 632 radiates strong electromagnetic interference into the air, and such interference is called differential mode radiation of the magnetron.

Further, the first cathode line 6321 and the second cathode line 6322 are twisted and arranged in a coil shape to form an air core inductor, and together with the choke coil 62 and the feedthrough capacitor assembly 63, a T-type filter is configured to suppress a common mode noise current, thereby reducing common mode electromagnetic radiation. In the circuit including the magnetron, the magnetron filter unit 60, and the power supply, a common mode noise current having the same current direction from the inside of the magnetron exists on the cathode line. At this time, a loop formed by the first cathode line 6321, the second cathode line 6322 and the ground radiates strong electromagnetic interference into the air, and the interference is referred to as common mode radiation of the magnetron. Through the above manner, under the condition that the cost is not increased, the cathode line 632 is arranged in a coil shape, so that the impedance of a common mode loop is increased, the common mode radiation is reduced, the element parameters of the magnetron filter assembly 60 can be reduced, and the cost and the technical requirements of the magnetron filter assembly 60 are reduced.

Specifically, comparing fig. 1 and 6, if the number of turns of the choke coil 62 in fig. 6 is 4 and the number of turns of the choke coil 12 in fig. 1 is 5, the number of turns of the choke coil 62 in fig. 6 is reduced. Accordingly, when the sidewalls are provided, the distance between the first sidewall 611 and the third sidewall 613 is reduced, i.e., the distance T between the first sidewall 611 and the third sidewall 613 in fig. 6 is smaller than the distance L between the first sidewall 111 and the third sidewall 113 in fig. 1. In this way, the cathode wire 632 is twisted and coiled without increasing the cost, and electromagnetic waves can be suppressed, and the number of turns of the choke coil 62 can be reduced, thereby saving the material cost of the choke coil 62. In some embodiments, since the cathode line 632 is disposed in a coil shape, and a part of the electromagnetic waves are consumed, the coil diameter of the choke coil 62 can be reduced, so that the space occupied by the choke coil 62 in the shielding case 61 is reduced, and accordingly, when the sidewalls are disposed, the distance between the second sidewall 612 and the fourth sidewall 614 is reduced, that is, the distance U between the second sidewall 612 and the fourth sidewall 614 in fig. 6 is smaller than the distance M between the second sidewall 112 and the fourth sidewall 114 in fig. 1.

In the present embodiment, the magnetron filter module 60 forms the cathode line 632 into a coil shape, so that the choke coil 62, the feedthrough capacitor module 63, and the coil-shaped cathode line 632 form an LCL resonant circuit, and suppresses and consumes the high-frequency electromagnetic waves generated by the magnetron, on one hand, the number of turns of the choke coil 62 in the shield case 61 can be reduced under the condition that the cathode line 632 can suppress the electromagnetic waves, thereby saving the material cost of the choke coil 62, and the manufacturing process of the choke coil 62 is simplified under the condition that the number of turns of the choke coil 62 is reduced; on the other hand, under the condition that the number of turns of the choke coil 62 is reduced, the safety distance between the choke coil 62 and the shield case 61 is also reduced correspondingly, so that the volume of the shield case 61 can be reduced, and finally the volume of the magnetron can be reduced.

Referring to fig. 7, fig. 7 is a schematic structural diagram of another embodiment of the magnetron filter assembly provided in the present application, and the magnetron filter assembly 70 provided in the present embodiment includes a shielding box 71, a choke coil 72, a feedthrough capacitor assembly 73, and a cathode terminal 74 of the magnetron disposed at the bottom of the shielding box 71, specifically, the cathode terminal 74 of the magnetron is disposed at the bottom of the shielding box 71 in a penetrating manner, and one end of the cathode terminal 74 is connected to the cathode of the magnetron.

The choke coil 72 is disposed in the shielding box 71, the shielding box 71 includes a first sidewall 711, a second sidewall 712, a third sidewall 713, and a fourth sidewall 714, the first sidewall 711, the second sidewall 712, the third sidewall 713, and the fourth sidewall 714 surround to form an accommodating space, wherein the first sidewall 711 and the third sidewall 713 are disposed opposite to each other, and the second sidewall 712 and the fourth sidewall 714 are disposed opposite to each other. One end of the choke coil 72 is connected to a cathode terminal 74; the feedthrough capacitor assembly 73 is disposed through the first side wall 711 of the shield case 71, and the feedthrough capacitor assembly 73 includes a lead-out wire 731 led out into the shield case 71 and a cathode wire 732 led out of the shield case 71. One end of the lead wire 731 is connected to the other end of the choke coil 72, the other end of the lead wire 731 is connected to the cathode line 732, and the cathode line 732 is connected to an external power supply; the cathode line 732 is provided in a coil shape.

Alternatively, the cavity of the shield case 71 may be divided into a first cavity a and a second cavity B based on the penetration position of the cathode terminal 74 in the shield case 71 as the plane Z parallel to the first side wall 711. The first cavity a is disposed close to the feedthrough capacitor assembly 73, the second cavity B is disposed away from the feedthrough capacitor assembly 73, and the choke coil 72 is disposed in the first cavity a. The volume of the first cavity A is larger than that of the second cavity B. Compared to the related art, since the choke coil 72 of the present embodiment can perform electromagnetic wave consumption because the cathode wire 732 is disposed in a coil shape, the number of turns of the choke coil 72 may be smaller than that of the choke coil 72 of the related art, the projection length of the choke coil 72 in the shield case 71 is reduced, and the distance between the third sidewall 713 and the first sidewall 711 can be reduced when the sidewalls are disposed, thereby reducing the volume of the shield case 71.

Specifically, comparing fig. 1 and 7, if the number of turns of the choke coil 72 in fig. 7 is 4 and the number of turns of the choke coil 12 in fig. 1 is 5, the number of turns of the choke coil 72 in fig. 7 is reduced. Accordingly, when the sidewalls are provided, the distance between the first sidewall 711 and the third sidewall 713 is reduced, that is, the distance V between the first sidewall 711 and the third sidewall 713 in fig. 7 is smaller than the distance L between the first sidewall 111 and the third sidewall 113 in fig. 1. In this way, the cathode wire 732 is twisted and coiled without increasing the cost, and electromagnetic waves can be suppressed, and the number of turns of the choke coil 72 can be reduced, thereby saving the material cost of the choke coil 72. In some embodiments, since the cathode wire 732 is disposed in a coil shape, and a part of the electromagnetic waves are consumed, the coil diameter of the choke coil 72 may be reduced, so that the space occupied by the choke coil 72 in the shielding case 71 is reduced, and accordingly, when the sidewalls are disposed, the distance between the second sidewall 712 and the fourth sidewall 714 is reduced, that is, the distance W between the second sidewall 712 and the fourth sidewall 714 in fig. 7 is smaller than the distance M between the second sidewall 112 and the fourth sidewall 114 in fig. 1.

In one embodiment, for dividing the cavity in the shielding box 71, the shielding box 71 may be divided into two cavities, for example, two rectangular parallelepiped cavities, by using the penetrating position of the cathode terminal 74 in the shielding box 71 and a plane parallel to the penetrating capacitor assembly 73 penetrating the first side wall 711 of the shielding box 71.

In the present embodiment, the choke coil 72 with a smaller number of turns is limited in the first cavity a of the shielding box 71, so that the choke coil 72 is located in the first cavity a, and the volume of the shielding box 71 can be reduced by reducing the volume of the second cavity B.

Therefore, compared to the prior art, the cathode wire 732 is provided in a coil shape, so that the electromagnetic waves along the cathode wire 732 can be consumed, and the choke coil 72 can be provided in the shield case 71 after the number of turns of the coil is reduced. Further, since the number of turns of the choke coil 72 is reduced, the space occupied by the choke coil 72 in the shield case 71 is reduced, and further, the distance between the side wall of the shield case 71 and the choke coil 72 is increased to be greater than the safety distance, the distance between the side wall and the choke coil 72 can be maintained at the safety distance by adjusting the side wall, and at this time, the volume of the shield case 71 is reduced.

It should be noted that, a person skilled in the art or a manufacturer may determine the space occupancy of the choke coil 72 and the feedthrough capacitor assembly 73 according to actual conditions, and will not be described herein too much.

Alternatively, the cathode terminal 74 includes a first cathode terminal 741 and a second cathode terminal 742, the first cathode terminal 741 and the second cathode terminal 742 are respectively connected to both ends of the cathode, and particularly, the choke coil 72 is connected to the cathode through the cathode terminal 74. The choke coil 72 includes a first choke coil 721 and a second choke coil 722, one end of the first choke coil 721 is connected to a first cathode terminal 741, and one end of the second choke coil 722 is connected to a second cathode terminal 742; the lead wire 731 includes a first lead wire 7311 and a second lead wire 7312, one end of the first lead wire 7311 being connected to the other end of the first choke coil 721, and one end of the second lead wire 7312 being connected to the other end of the second choke coil 722.

Further, the feedthrough capacitor assembly 73 further includes an inner housing 733, an outer housing 734, a first capacitor (not shown), and a second capacitor (not shown). The inner housing 733 is disposed in the shielding box 71 to form a first accommodating chamber; the outer case 734 is disposed outside the shield case 71, and forms a second accommodation chamber. Specifically, the inner housing 733 is disposed on a side of the first sidewall 711 facing the inside of the shield case 71, and the outer housing 734 is disposed on a side of the first sidewall 711 facing away from the inside of the shield case 71. One end of the first capacitor is connected to the first cathode line 7321, and the other end of the first capacitor is grounded. One end of the second capacitor is connected to the second cathode line 7322, and the other end of the second capacitor is grounded.

Further, in this embodiment, the choke coil 72 may be an air-core coil based on a conventional magnetron structure, and since only an air-core segment is reserved, the inter-turn distances of the coils are the same, the processing process may be simpler, and the consistency is better.

Similarly, the shielding box 71 may be divided into a first cavity a and a second cavity B based on the penetrating position of the cathode terminal 74 in the shielding box 71, once the positions of the cathode terminal 74 and the feedthrough capacitor assembly 73 are determined, the choke coil 72 is located in the cavity close to the feedthrough capacitor assembly 73, that is, in the first cavity a, and under the condition that the turn-to-turn distance between every two turns of the choke coil 72 is fixed, the number of turns of the choke coil 72 can be determined, and thus the length of the choke coil 72 in the axial direction can be determined. Therefore, after the feedthrough capacitor assembly 73 is disposed on the first side wall 711 of the shield case 71, since the length of the choke coil 72 is fixed, if the position of the cathode terminal 74 is fixed, the vertical distance from the cathode terminal 74 to the third side wall 713 can be reduced on the basis of the safe distance between the choke coil 72 and the shield case 71, that is, the volume of the third side wall 713 is reduced closer to the cathode terminal 74 than in the related art, that is, the volume of the second cavity B is reduced. At this time, the volume of the shield case 71 is reduced.

Further, if the length of the choke coil 72 is smaller than the vertical distance from the cathode terminal 74 to the first sidewall 711 in the related art, after the feedthrough capacitor assembly 73 is disposed on the first sidewall 711 of the shield case 71, since the length of the choke coil 72 is fixed, the vertical distance from the cathode terminal 74 to the first sidewall 711 is reduced, and at this time, the length of the choke coil 72 in the axial direction may be equal to the vertical distance from the cathode terminal 74 to the first sidewall 711, that is, the first sidewall 711 is closer to the cathode terminal 74 than in the related art, and accordingly, the vertical distance from the cathode terminal 74 to the third sidewall 713 can be reduced based on the safety distance from the choke coil 72 to the shield case 71, that is, the third sidewall 713 is closer to the cathode terminal 74 than in the related art. At this time, the volume of the shield case 71 is reduced.

In other embodiments, as shown in fig. 8, the dissipative medium 75 can be disposed on the outgoing line 731 of the feedthrough capacitor assembly 73, and at this time, the dissipative medium 75 can absorb the electromagnetic wave propagated from the cathode terminal 74 into the shielding box 71, so that the number of turns of the choke coil 72 can be reduced to some extent by the presence of the dissipative medium 75, and the volume of the shielding box 71 can be reduced, and finally the volume of the magnetron can be reduced.

Specifically, referring to fig. 9, the consumable medium 75 is provided with a first through hole 751 and a second through hole 752, the first lead wire 7311 is inserted into the first through hole 751, and the second lead wire 7312 is inserted into the second through hole 752. At this time, the first and second lead wires 7311 and 7312 and the dissipative medium 75 form an inductance having both the characteristics of differential mode inductance and common mode inductance, and can dissipate the electromagnetic wave along the lead wire 731 when the magnetron filter assembly 70 is operated.

Optionally, the consumable medium 75 is at least partially embedded in the inner shell 733, that is, the consumable medium 75 is at least partially located in the first accommodating chamber, and specifically, at least a portion of an outer wall of the consumable medium 75 is attached to at least a portion of an inner wall of the inner shell 733. At least a portion of the consumable media 75 is secured within the first receiving cavity, such as by an interference fit or welding. Therefore, in this embodiment, by disposing at least part of the consumption medium 75 in the first accommodating cavity of the inner housing 733, and at least part of the feedthrough capacitor assembly 73 overlaps at least part of the consumption medium 75, the number of turns of the choke coil 72 can be further reduced on the premise of not occupying the internal space of the shield box 71, and the space occupied by the choke coil 72 in the shield box 71 can be further reduced, so that the volume of the shield box 71 can be further reduced.

Due to the operating characteristics of the magnetron itself, during normal operation, a negative high voltage is connected to the magnetron filtering component 70, and in order to prevent the phenomenon of discharge and ignition between the choke coil 72 and the shielding box 71 in the magnetron filtering component 70, a safe distance between the choke coil 72 and the feedthrough capacitor component 73 and the shielding box 71 needs to be ensured during design. In the prior art, air is used as an insulating medium to avoid the phenomenon of point discharge, and the existing method has the defects that the volume of the shielding box 71 is inevitably overlarge due to the fact that the air is used as the insulating medium, so that the whole volume of the magnetron is increased, the volume of household appliances such as a microwave oven is huge, and the effective use area is small. In addition, because the structure uses air as a medium, when the air is humid, the withstand voltage test may not pass, so that the tester can make a misjudgment on the safety performance of the product.

Optionally, an insulating material (not shown) may be provided within the shield case 71, which in this embodiment may be present in a number of different ways. For example, if a gas such as sulfur hexafluoride is used as the insulating material, the insulating gas may be uniformly filled in the shield case 71, or if a solid or liquid insulating material is used, the solid or liquid insulating material may be wrapped around the choke coil 72 or the like, or the solid or liquid insulating material may be attached to the inner wall of the shield case 71, and the liquid insulating material may be natural mineral oil, natural vegetable oil, synthetic oil or the like, and the solid insulating material may be insulating varnish, insulating glue, fiber products, rubber, plastics and products thereof, glass, ceramic products, mica, asbestos and products thereof.

Referring to fig. 10, fig. 10 is a schematic structural diagram of an embodiment of a magnetron provided by the present application. The magnetron 100 includes a magnetron body 101 and a magnetron filter assembly 102. The magnetron filtering component 102 is disposed on the magnetron main body 101 for consuming electromagnetic waves transmitted from the magnetron main body 101, and the magnetron filtering component 102 is the magnetron filtering component provided in any of the above embodiments. The magnetron filtering component is characterized in that the cathode wire is arranged into a coil shape, so that the high-frequency electromagnetic wave generated by the magnetron is inhibited and consumed by the LCL resonant circuit formed by the choke coil, the feedthrough capacitor component and the coil-shaped cathode wire, on one hand, the number of turns of the choke coil in the shielding box can be reduced under the condition that the cathode wire can inhibit the electromagnetic wave, the material cost of the choke coil is saved, and the manufacturing process of the choke coil is simplified under the condition that the number of turns of the choke coil is reduced; on the other hand, under the condition that the number of turns of the choke coil is reduced, the safety distance between the choke coil and the shielding box can be correspondingly reduced, so that the volume of the shielding box can be reduced, and finally the volume of the magnetron can be reduced.

Referring to fig. 11, fig. 11 is a schematic structural diagram of an embodiment of a household appliance provided in the present application. The household appliance 110 includes a magnetron 111. In the magnetron 111 according to the above embodiment, since the magnetron filtering assembly according to any of the above embodiments exists in the magnetron according to the above embodiments, the volume of the household appliance 110 is reduced due to the reduction of the volume of the magnetron filtering assembly.

In some embodiments, the household appliance 110 may be a microwave oven.

The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.

Claims

1. A magnetron filter assembly, comprising:

the magnetron comprises a shielding box, a cathode terminal of a magnetron penetrates through the bottom of the shielding box, and one end of the cathode terminal is connected with the cathode of the magnetron;

the feedthrough capacitor assembly penetrates through the side wall of the shielding box and comprises a lead-out wire led out into the shielding box and a cathode wire led out of the shielding box, one end of the lead-out wire is connected with the cathode wiring terminal, the other end of the lead-out wire is connected with the cathode wire, and the cathode wire is used for being connected with an external power supply;

wherein, the negative pole line is the setting of coil form.

2. The magnetron filtering assembly of claim 1,

the cathode terminal comprises a first cathode terminal and a second cathode terminal, and the first cathode terminal and the second cathode terminal are respectively connected with two ends of the cathode;

the lead-out wire includes first lead-out wire and second lead-out wire, the one end of first lead-out wire is connected first cathode terminal, the one end of second lead-out wire is connected second cathode terminal.

3. The magnetron filtering assembly of claim 2,

the cathode lines comprise a first cathode line and a second cathode line, one end of the first cathode line is connected with the other end of the first outgoing line, and one end of the second cathode line is connected with the other end of the second cathode terminal; wherein the first cathode line and the second cathode line are twisted in pairs and are arranged in a coil shape.

4. The magnetron filtering assembly of claim 3,

the cathode lines further comprise third cathode lines, and the third cathode lines are grounded;

the first cathode wire, the second cathode wire and the third cathode wire are twisted in three and arranged in a coil shape.

5. The magnetron filtering assembly of claim 3,

the feedthrough capacitor assembly further comprises:

the inner shell is arranged in the shielding box to form a first accommodating cavity;

the outer shell is arranged outside the shielding box and forms a second accommodating cavity;

one end of the first capacitor is connected with the first cathode line, and the other end of the first capacitor is grounded;

and one end of the second capacitor is connected with the second cathode wire, and the other end of the second capacitor is grounded.

6. The magnetron filtering assembly of claim 1,

the magnetron filtering component further comprises a consumption medium, wherein the consumption medium is sleeved on the cathode terminal and used for consuming electromagnetic waves along the cathode terminal, or the consumption medium is sleeved on the outgoing line and used for consuming electromagnetic waves along the outgoing line.

7. The magnetron filtering assembly of claim 1,

the magnetic core is arranged on the cathode wire and penetrates through the accommodating space of the cathode wire in a coil shape.

8. The magnetron filtering assembly of claim 1,

the magnetron filtering component also comprises a choke coil, and one end of the choke coil is connected with the other end of the cathode terminal;

one end of the leading-out wire is connected with the other end of the choke coil, and the other end of the leading-out wire is connected with the cathode wire.

9. A magnetron, comprising:

a magnetron main body;

a magnetron filter assembly disposed on the magnetron body for dissipating electromagnetic waves propagating in the magnetron body, the magnetron filter assembly as claimed in any one of claims 1 to 8.

10. A household appliance comprising a magnetron according to claim 9.