阅读说明：本技术 磁控管滤波组件、磁控管以及家用电器 (Magnetron filtering component, magnetron and household appliance ) 是由 罗良敏 梁定军 王贤友 朱军 郭海洋 唐相伟 张昀 施志雄 于 2020-12-30 设计创作，主要内容包括：本申请公开了一种磁控管滤波组件、磁控管以及家用电器,其中,所述磁控管滤波组件包括：屏蔽盒、空芯线圈、穿心电容组件、消耗介质。所述屏蔽盒底部设置有绝缘柱,所述磁控管的阴极接线端贯穿设置于所述绝缘柱,所述阴极接线端的一端连接所述磁控管的阴极；空芯线圈设置于所述屏蔽盒内,所述空芯线圈的一端连接所述阴极接线端的另一端；所述穿心电容组件贯穿设置于所述屏蔽盒的侧壁,所述穿心电容组件包括向所述屏蔽盒内引出的引出线,所述引出线连接所述空芯线圈的另一端；所述消耗介质套设于所述绝缘柱,用于消耗沿所述阴极接线端引出的电磁波。通过上述方式,本申请能够在提升滤波组件一致性的同时减小滤波组件的体积。(The application discloses magnetron filtering subassembly, magnetron and domestic appliance, wherein, magnetron filtering subassembly includes: shielding box, air core coil, feedthrough capacitor assembly, and consumable media. The bottom of the shielding box is provided with an insulating column, a cathode terminal of the magnetron penetrates through the insulating column, and one end of the cathode terminal is connected with the cathode of the magnetron; the hollow coil is arranged in the shielding box, and one end of the hollow coil is connected with the other end of the cathode wiring terminal; 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 the lead-out wire is connected with the other end of the air-core coil; the consumption medium is sleeved on the insulating column and used for consuming electromagnetic waves led out along the cathode terminal. By the mode, the size of the filtering component can be reduced while the consistency of the filtering component is improved.)

1. A magnetron filter assembly, comprising:

the bottom of the shielding box is provided with an insulating column, a cathode terminal of the magnetron penetrates through the insulating column, and one end of the cathode terminal is connected with the cathode of the magnetron;

the hollow coil is arranged in the shielding box, and one end of the hollow coil is connected with the other end of the cathode wiring terminal;

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 the lead-out wire is connected with the other end of the hollow coil;

and the consumption medium is sleeved on the insulating column and used for consuming the electromagnetic waves led out along the cathode terminal.

2. The magnetron filtering assembly of claim 1,

the cavity of the shielding box comprises: the first cavity is close to the feedthrough capacitor assembly, the second cavity is far away from the feedthrough capacitor assembly, the first cavity and the second cavity are divided based on the penetrating position of the cathode terminal, and the air-core coil is arranged in the first cavity.

3. 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 air-core coil comprises a first coil and a second coil, one end of the first coil is connected with the first cathode terminal, and one end of the second coil is connected with the second cathode terminal;

the outgoing line includes first outgoing line and second outgoing line, first outgoing line is connected the other end of first coil, the second outgoing line is connected the other end of second coil.

4. The filter 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;

the first pin is connected with the first outgoing line and is led out from the outer shell;

the second pin is connected with the second outgoing line and is led out from the outer shell;

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

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

5. The filter assembly of claim 4,

the dissipative medium is disposed in correspondence with a magnet in the magnetron.

6. Filtering assembly according to one of claims 1 to 5,

the consumption medium is ferrite or amorphous magnet.

7. Filtering assembly according to one of claims 1 to 5,

the consumption medium is annular, the insulating column is columnar, and the inner wall of the consumption medium is tightly attached to the outer wall of the insulating column.

8. Filtering assembly according to one of claims 1 to 5,

insulating materials are placed in the shielding box.

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 is characterized in that the household appliance comprises a casing,

the household appliance comprises a magnetron as claimed in claim 9.

Technical Field

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

Background

The magnetron is an electric vacuum device for generating microwave energy, when the magnetron works, because the direct current magnetic field intensity of the working space in the magnetron is not uniform, and the inner space is not completely formed with vacuum filling and has residual gas, when the electrons generated by the magnetron rotate, the electrons collide with each other to generate vibration phenomenon, and high-frequency harmonic waves are generated. Some of the high frequency harmonics radiate outwards through a cathode outgoing line of the magnetron, which is easy to cause the external ignition of the magnetron, and can generate electromagnetic interference on surrounding devices to influence the working efficiency of the magnetron.

At present, a filter assembly is generally used to filter the noise extracted from the cathode terminal of the magnetron, so as to improve the EMC performance (electromagnetic compatibility) of the magnetron. Therefore, the filter assembly largely determines the EMC performance of the magnetron.

In normal operation, the filter assembly is connected with negative high voltage, and the shielding box is zero potential, so that in order to avoid sparking between the shielding box and the filter assembly, the distance between the shielding box and the filter assembly must be ensured, and the shielding box has larger volume, which is extremely not favorable for the miniaturization design of the size of the magnetron.

Disclosure of Invention

The application mainly provides a magnetron filtering component, a magnetron and a household appliance, and can solve the problem that a shielding box in the prior art is too large in volume.

To solve the above technical problem, a first aspect of the present application provides a magnetron filtering assembly, including: shield can, air core coil, feedthrough capacitor assembly, and consumable media. The bottom of the shielding box is provided with an insulating column, a cathode terminal of the magnetron penetrates through the insulating column, and one end of the cathode terminal is connected with the cathode of the magnetron; the hollow coil is arranged in the shielding box, and one end of the hollow coil is connected with the other end of the cathode wiring terminal; 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 the lead-out wire is connected with the other end of the air-core coil; the consumption medium is sleeved on the insulating column and used for consuming electromagnetic waves led out along the cathode terminal.

Wherein, the cavity of shielding box includes: the first cavity is close to the feedthrough capacitor assembly, the second cavity is far away from the feedthrough capacitor assembly, the first cavity and the second cavity are divided based on the penetrating position of the cathode terminal, and the air-core coil is arranged in the first cavity.

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 air-core coil comprises a first coil and a second coil, one end of the first coil is connected with the first cathode terminal, and one end of the second coil is connected with the second cathode terminal; the outgoing line includes first outgoing line and second outgoing line, first outgoing line is connected the other end of first coil, the second outgoing line is connected the other end of second coil.

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; the first pin is connected with the first outgoing line and is led out from the outer shell; the second pin is connected with the second outgoing line and is led out from the outer shell; one end of the first capacitor is connected with the first pin, and the other end of the first capacitor is grounded; and one end of the second capacitor is connected with the second pin, and the other end of the second capacitor is grounded.

Wherein the consumable medium is disposed corresponding to a magnet in the magnetron.

Wherein the consumable medium is ferrite or amorphous magnet.

The consumption medium is annular, the insulating column is columnar, and the inner wall of the consumption medium is tightly attached to the outer wall of the insulating column.

Wherein, insulating material is placed in the shielding box.

In order to solve the above technical problem, a second aspect of the present application provides a magnetron including: a magnetron main body; the magnetron filtering assembly is arranged on the magnetron main body and used for consuming electromagnetic waves transmitted from the magnetron main body, and the magnetron filtering assembly is the magnetron filtering assembly provided by the first aspect.

In order to solve the above technical problem, a third aspect of the present application provides a household appliance including the magnetron as provided in the second aspect.

The beneficial effect of this application is: be different from prior art's condition, this application is provided with the insulated column bottom the shielding box, make the cathode wiring end of magnetron run through set up in the insulated column, the other end of magnetron cathode wiring end is connected to hollow coil's one end, the lead-out wire of punching capacitor subassembly is connected to hollow coil's the other end, locate the insulated column with consuming the medium cover, consume the electromagnetic wave of drawing along the cathode wiring end, constitute LLC tertiary filtering (common mode L + difference mode L + electric capacity C) by consuming the medium, hollow coil and punching capacitor subassembly, strengthen the filtering component uniformity, still owing to only use hollow core section coil, coil length has effectively been shortened, simultaneously, establish the space in can make full use of shielding box on the insulated column with consuming the medium cover, be favorable to reducing the volume of shielding box, realize the miniaturized design of size of magnetron.

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 diagram of an embodiment of a prior art magnetron filter assembly;

FIG. 2 is a schematic structural diagram of an embodiment of a magnetron filter assembly according to the present application;

FIG. 3 is a schematic circuit diagram of an embodiment of a magnetron filtering assembly according to the present application;

FIG. 4 is a schematic structural diagram of another embodiment of a magnetron filter assembly according to the present application;

FIG. 5 is a schematic block diagram of the structure of an embodiment of a magnetron of the present application;

fig. 6 is a block diagram schematically illustrating the structure of an embodiment of the household appliance of 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, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. 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.

The terms "first" and "second" in this application are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features shown. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

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. Those skilled in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a filtering component of a magnetron in the prior art. The filter assembly includes a choke coil 100, a feedthrough capacitor 200, and a shield case 300.

In which the shield case 300 is connected to the magnetron to constitute a part of the magnetron. The cathode lead 400 of the magnetron penetrates the bottom of the shielding box 300 to lead out high-frequency harmonic waves generated when the magnetron normally works. The shield case 300 is formed of a metal plate, surrounds the choke coil 100, and forms a closed space therein to protect the choke coil 100 and its circuit connection, while the shield case 300 blocks a path of the high frequency harmonic to be radiated to the space so that the high frequency harmonic is only in the closed space of the shield case 300 and does not radiate to the outside.

The feedthrough capacitor 200 is connected to the choke coil 100 through the shield case 300 by a connecting wire to supply power to the magnetron, one end of the choke coil 100 is connected to a cathode lead 400 of the magnetron, and the other end of the choke coil 100 is connected to the feedthrough capacitor 200 to form a circuit connection. The choke coil 100 includes a magnetic core segment 101 and an air core segment 102, and the pitch of the magnetic core segment 101 is different from that of the air core segment 102.

The choke coil 100 and the feedthrough capacitor 200 form an LC filter circuit, which suppresses and filters the interference wave from the cathode lead 400, thereby achieving a filtering effect.

Influenced by the filtering effect, the choke coil 100 has a certain length, two ends of the choke coil 100 are respectively connected to the cathode outgoing line 400 and the feedthrough capacitor 200 by bent wires, the central axis of the choke coil 100 is far away from the connecting line of the cathode outgoing line 400 and the feedthrough capacitor 200, a large space is occupied, and a certain distance must be kept between the shielding box 300 and each filter, so that the shielding box 300 has a large volume, and the size of the magnetron is difficult to optimally design.

Referring to fig. 2, fig. 2 is a schematic structural diagram of a magnetron filtering assembly according to an embodiment of the present invention.

The filter assembly 10 of the present embodiment includes a shield case 11, an air-core coil 12, a feedthrough capacitor assembly 13, and a dissipative medium 14. Wherein, the bottom of the shielding box 11 is provided with an insulating column 15, a cathode terminal 16 of the magnetron penetrates through the insulating column 15, and one end of the cathode terminal 16 is connected with the cathode of the magnetron; the air-core coil 12 is arranged in the shielding box 11, and one end of the air-core coil 12 is connected with the other end of the cathode terminal 16; the feedthrough capacitor assembly 13 penetrates through the side wall of the shielding box 11, the feedthrough capacitor assembly 13 comprises a lead-out wire 131 led out into the shielding box 11, and the lead-out wire 131 is connected with the other end of the air-core coil 12; the dielectric 14 is sleeved on the insulating column 15 for dissipating the electromagnetic wave led out along the cathode terminal 16.

Alternatively, the dissipative medium 14 can be a ferrite material or an amorphous magnet. The lossy dielectric 14 made of ferrite material has good high frequency impedance characteristics, and can absorb and suppress high frequency interference well, converting the high frequency electromagnetic interference into heat loss.

Further, the cathode terminal 16 includes a first cathode terminal 161 and a second cathode terminal 162, and the first cathode terminal 161 and the second cathode terminal 162 are respectively connected to both ends of the cathode of the magnetron (not shown in the figure); the air-core coil 12 includes a first coil 121 and a second coil 122, one end of the first coil 121 is connected to a first cathode terminal 161, and one end of the second coil 122 is connected to a second cathode terminal 162; lead lines 131 include a first lead line 1311 and a second lead line 1312, first lead line 1311 being connected to the other end of first coil 121, and second lead line 1312 being connected to the other end of second coil 122.

Further, the feedthrough capacitor assembly 13 further includes: inner housing 132, outer housing 133, first pin 134, second pin 135.

Wherein, the inner housing 132 is disposed in the shielding box 11 to form a first accommodating chamber (not shown); the outer housing 133 is disposed outside the shield case 11 to form a second accommodating chamber (not shown); first lead 134 is connected to first lead 1311 and led out of outer case 133, and second lead 135 is connected to second lead 1312 and led out of outer case 133.

Further, in the first accommodation chamber and the second accommodation chamber formed by the inner case 132 and the outer case 133, a first capacitor and a second capacitor (the first capacitor and the second capacitor are not shown in the drawing) are provided. One end of the first capacitor is connected to the first pin 134 of the feedthrough capacitor assembly 13, the other end of the first capacitor is grounded, and the third end of the first capacitor is connected to the first outgoing line 1311 of the feedthrough capacitor assembly 13; one end of the second capacitor is connected to the second pin 135 of the feedthrough capacitor assembly 13, the other end of the second capacitor is grounded, and the third end of the second capacitor is connected to the second lead line 1312.

Referring to fig. 3, fig. 3 is a circuit diagram of a magnetron filtering component according to the present embodiment. The circuit composition of the filtering component comprises: a consumable medium L14, a first coil L121, a second coil L122, a first capacitor C151, and a second capacitor C152. The consumption medium L14, the first coil L121, the second coil L122, the first capacitor C151 and the second capacitor C152 form LLC three-level filtering (common mode inductance L + differential mode inductance L + capacitor C), the filtering effect is stable, and the consistency is strong.

The insulating column 15 may be made of an insulating material such as ceramic, and is used to support and fix the cathode terminal 16.

Alternatively, the consumption medium 14 is ring-shaped, the insulating column 15 is column-shaped, and the inner wall of the consumption medium 14 is closely attached to the outer wall of the insulating column 15. Specifically, the annular consumption medium 14 is fitted over the insulating column 15 such that the inner wall of the consumption medium 14 is closely attached to the outer wall of the insulating column 15, and the consumption medium 14 can be fitted and fixed to the insulating column 15 by utilizing the appearance characteristics of the consumption medium 14 and the insulating column 15. In this way, the insulating column 15 not only serves to fix the first cathode terminal 161 and the second cathode terminal 162, but also provides a stable support for fixing the consumption medium 14, and the space in the shield case 11 can be fully utilized, so that a better filtering effect can be obtained without occupying too much space in the shield case 11.

Alternatively, the upper edge of the consumption medium 14 is designed to be flush with the upper edge of the insulation column 15, or the upper edge of the consumption medium 14 is designed to be lower than the upper edge of the insulation column 15. It is convenient to connect the first coil 121 to the first cathode terminal 161 and the second coil 122 to the second cathode terminal 162.

Alternatively, the dielectric 14 is disposed corresponding to the magnet in the magnetron to adsorb and fix the dielectric 14 with magnetism to the bottom of the shield case 11 by the adsorption capability of the magnet so that the dielectric 14 does not fall off the insulating column 15. The fixing of the consumable medium 14 is realized by skillfully using the devices of the magnetron, and the fixing scheme of the consumable medium 14 is not additionally designed, so that the manufacturing process is simplified. Of course, in other embodiments, in order to make the consumable medium 14 more stable, the consumable medium 14 may be fixed to the bottom of the shielding box 11 or the insulating column 15 by using a high temperature resistant adhesive; alternatively, the diameter of the end of the insulating cylinder 15 may be designed to be slightly larger than the inner diameter of the consumption medium 14, so that the consumption medium 14 is stuck to the insulating cylinder 15 and does not slip off. The skilled person can fully think of other schemes to fix the consuming medium 14, for example, a high-temperature resistant rubber material with a high friction coefficient can be arranged on the outer wall of the insulating column 15, and then the consuming medium 14 is tightly attached to the rubber material and sleeved on the insulating column 15, so that the consuming medium 14 can be tightly sleeved on the insulating column 15 by using the high friction property of the rubber material, and does not slip off. As such, other ways of securing the consumable medium 14 will also occur to those skilled in the art, and are not listed here.

In this embodiment, the cavity of the shielding box 11 includes: a first cavity 111 close to the feedthrough capacitor assembly 13 and a second cavity 112 far from the feedthrough capacitor assembly 13, wherein the first cavity 111 and the second cavity 112 are divided based on the penetrating position of the cathode terminal 16, in the dividing manner of this embodiment, the dashed line OP is referred to, and the air-core coil 12 is disposed in the first cavity 111. The division of the first cavity 111 and the second cavity 112 is only a schematic division for convenience of location description, and does not indicate that the first cavity 111 and the second cavity 112 are separated into independent cavities by using a baffle or the like. Since the length of the air-core coil 12 is greatly reduced, the width M of the shield case 11 can be reduced by occupying only the first cavity 111 near the feedthrough capacitor assembly 13 in the shield case 11.

Optionally, the side wall of the shielding box 11 is adapted to the position design of the first coil 121, the second coil 122 and the consuming medium 14, so that the positions of the first coil 121, the second coil 122 and the consuming medium 14 closest to the side wall of the shielding box 11 are all equidistant from the side wall of the shielding box 11.

Specifically, in an embodiment, please refer to fig. 4, fig. 4 is a schematic structural diagram of another embodiment of a magnetron filtering component according to the present application. In the embodiment, the consumed medium 14 is a circular ring (that is, the cross section of the consumed medium 14 is a circular ring), so that in the two cavities of the shielding box 11, the cross section of the first cavity 111 is square, the cross section of the second cavity 112 is semicircular, and the side wall of the shielding box 11 corresponding to the second cavity 112 is arc-shaped. In this embodiment, the side wall of the shield case 11 is adapted to the shape of the consumable medium 14 and the air-core coil 12, so that the occupation of the region A, B by the shield case 11 can be eliminated and the volume of the shield case 11 can be effectively reduced compared with a square shield case.

Optionally, the air core coils 12 are equally spaced. In the prior art, because the choke coil has a hollow core section and a magnetic core section, and the turn-to-turn distances of the hollow core section and the magnetic core section are different, the coil has a loose wire part with large turn-to-turn distance and a dense wire part with small turn-to-turn distance, the winding process is complex, and the winding process is difficult to control. In addition, in the prior art, the manufacturing of the magnetic core section is required, so that the coil manufacturing has a winding-inserting core-solidifying process flow, and the manufacturing flow is complicated. The manufacturing process of the air-core coil of the embodiment only needs to wind, does not need to perform core inserting and curing operation, and is simple and easy to realize.

Optionally, the axis of air core coil 12 is on the line connecting cathode terminal 16 and lead-out wire 131. Specifically, the axis of the first coil 121 is on the line connecting the first cathode terminal 161 and the first lead wire 1311, and the axis of the second coil 122 is on the line connecting the second cathode terminal 162 and the second lead wire 1312. In this way, the air-core coil 12 can be fixed at a position close to the center of the shield case 11, so that the positions of the respective filter devices are highly concentrated, the width N of the shield case 11 is reduced, and the volume of the shield case 11 is reduced.

Optionally, the first and second lead lines 1311, 1312 are 5-10 millimeters in length. The connection distance between the feedthrough capacitor assembly 13 and the lead-out wires 16 is shortened as much as possible, and the width M of the shield case 11 is further reduced, thereby reducing the volume of the shield case.

In other embodiments, the first coil 121 and the second coil 122 may be integrated into the feedthrough capacitor assembly 13. That is, the ports of the first and second capacitors are directly connected to the first and second coils 121 and 122 without connecting the first and second capacitors to the first and second coils through the first lead lines 1311 and the second lead lines 1312 connecting the second and second capacitors to the second coil 122, thereby omitting the lengths of the first and second lead lines 1311 and 1312, further reducing the distance between the air-core coil 12 and the feedthrough capacitor assembly 13, and concentrating the spatial positions of the respective filters.

Compared with the scheme of connecting the independent feedthrough capacitor assembly 13 and the air core coil 12, the feedthrough capacitor assembly 13 and the air core coil 12 are integrated into a whole, the length of the outgoing line 131 of the feedthrough capacitor assembly 13 can be ignored, the distance between the air core coil 12 and the feedthrough capacitor assembly 13 is further reduced, and the spatial positions of the filter devices are concentrated.

Due to the working characteristics of the magnetron, when the magnetron works normally, the magnetron filtering component 10 is connected with a negative high voltage, and in order to prevent the phenomenon of discharge and ignition between the hollow coil 12 and the shielding box 11 in the magnetron filtering component 10, the safe distance between the hollow coil 12 and the feedthrough capacitor component 13 and the shielding box 11 needs to be ensured during design. The prior art uses air as an insulating medium to avoid the phenomenon of point discharge, and has the disadvantages that the volume of the shielding box 11 is inevitably overlarge due to the use of air as the insulating medium, so that the whole volume of the magnetron is increased, and the household appliances such as a microwave oven and the like are 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 is provided within the shield case 11. In this embodiment, the insulating material 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 into the shield case 11, or when a solid or liquid insulating material is used, the solid or liquid insulating material may be wrapped around the hollow coil 12 or the like, or the solid or liquid insulating material may be attached to the inner wall of the shield case 11, the liquid insulating material is usually natural mineral oil, natural vegetable oil, synthetic oil or the like, and the solid insulating material is usually insulating paint, insulating glue, fiber products, rubber, plastics and products thereof, glass, ceramic products, mica, asbestos and products thereof. The insulating material may be added with a material that absorbs electromagnetic waves.

Specifically, in the embodiment of disposing a solid insulating material in the shielding box 11, a shielding cover made of an insulating material may be disposed on the consuming medium 14 and the air-core coil 12 to avoid an ignition phenomenon between the air-core coil 12 and the housing of the shielding box 11, so as to further reduce the distance between each surface of the shielding box 11 and the air-core coil 12, reduce the space in the shielding box 11, and further reduce the volume of the shielding box 11. Or, in another embodiment, a layer of insulating material may be disposed at a portion of the upper cover of the shielding box 11 corresponding to the air-core coil 12, for example, the insulating material may be adhered to the upper cover of the shielding box 11 by using a high temperature resistant adhesive, or the insulating material may be fixed inside the upper cover of the shielding box 11 by using a screw made of a high temperature resistant insulating material, when the distance between the air-core coil 12 and the shielding box 11 is small, the contact between the air-core coil 12 and the shielding box 11 may be blocked, so as to prevent a sparking phenomenon from occurring between the air-core coil 12 and the upper cover of the shielding box 11, and the distance between the upper cover of the shielding box 11 and the air-core coil 12 may be further reduced, so as to reduce the volume of the shielding box 11.

Among these, the solid insulating material may be, for example, a ferrite material, which is the most common microwave absorbing material and is readily available. The ferrite material is used for manufacturing the shielding cover, so that on one hand, the shielding box 11 can be prevented from contacting the hollow coil 12, the phenomenon of sparking between the hollow coil 12 and the shell of the shielding box 11 is avoided, and on the other hand, the ferrite material can absorb high-frequency harmonic waves radiated in the space of the shielding box 11, and further the outward radiation of the high-frequency harmonic waves is prevented. The insulating material may also be high temperature resistant plastic or ceramic, which is used as an insulating substance and also plays a role in blocking the hollow coil 12 from contacting the housing of the shielding box 11, and will not be described herein again.

Other designs are well within the reach of the skilled person based on the above embodiments of the present application, for example, the insulating columns 15 may also be made of ferrite material. Therefore, on one hand, the insulating column 15 can support and fix the cathode terminal 16, and on the other hand, the insulating column 15 made of ferrite material is equivalent to adding a low-pass filter to the cathode terminal 16, so that high-frequency interference led out from the cathode terminal 16 can be inhibited, meanwhile, the ferrite material can also play a role in shielding, components radiated to the space by the high-frequency interference penetrating through the insulating column 15 are reduced, filtering is realized from the source, and the stability and the consistency of the filtering are further enhanced.

Different from the prior art, the embodiment uses the air-core coil 12 as the choke coil, so as to greatly shorten the length of the choke coil, further reduce the occupied space of the coil, and finally achieve the purpose of reducing the volume of the shielding box 11. Meanwhile, the filtering devices such as the air-core coil 12 and the consumption medium 14 are arranged at the source of high-frequency interference, so that interference filtering is carried out at the source, and the filtering stability is enhanced. More importantly, the consumed medium 14, the air-core coil 12 and the feedthrough capacitor assembly 13 of the embodiment form LLC three-stage filtering, so that the filtering capability is enhanced, the volume of the shielding box is reduced while the filtering effect is enhanced, and the size miniaturization design of the magnetron is facilitated.

Referring to fig. 5, fig. 5 is a schematic structural diagram of an embodiment of a magnetron provided by the present application. The magnetron 20 includes a magnetron body 21 and a magnetron filter assembly 22. Wherein, the magnetron filtering component 22 is disposed on the magnetron main body 21 for consuming the electromagnetic wave transmitted from the magnetron main body 21, and the magnetron filtering component 22 is the magnetron filtering component provided in any of the above embodiments. The components included in the magnetron filtering assembly 22 and the functions and the positional relationships of the components have been described in detail in the above embodiments, and are not described in detail herein.

The magnetron filtering component inhibits and consumes high-frequency electromagnetic waves generated by the magnetron main body 21 by increasing the electromagnetic wave consumption medium through the LLC resonant circuit consisting of the consumption medium, the air-core coil and the feedthrough capacitor component, on one hand, the number of turns of the choke coil in the shielding box is reduced under the condition that the filtering component can inhibit the electromagnetic waves, 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. 6, fig. 6 is a schematic structural diagram of an embodiment of a household appliance provided in the present application. The household appliance 30 is a magnetron 31. In the magnetron 31 according to the above embodiment, since the magnetron filter assembly according to any of the above embodiments is included in the magnetron 31 according to the above embodiments, the volume of the household appliance 30 is reduced due to the reduction of the volume of the magnetron filter assembly. The household appliance 30 is, for example, a microwave oven.

The above description is only an example 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, or which are directly or indirectly applied to other related technical fields, are intended to be included within the scope of the present application.