阅读说明：本技术 一种磁控管滤波组件、磁控管以及家用电器 (Magnetron filtering component, magnetron and household appliance ) 是由 罗良敏 刘洪颐 张昀 万剑锋 施志雄 王贤友 侯俊峰 唐相伟 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,该磁控管滤波组件包括：屏蔽盒、线圈和穿心电容组件,其中,磁控管的阴极接线端贯穿设置于所述屏蔽盒的底部,所述阴极接线端的一端连接所述磁控管的阴极；线圈设置于所述屏蔽盒内,所述线圈的一端连接所述阴极接线端的另一端,所述线圈由横截面为非正圆形的导电线绕成；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线圈的另一端。通过上述方式,本申请能够缩小屏蔽盒的体积,增强滤波效果。(The application discloses magnetron filtering subassembly, magnetron and domestic appliance, this magnetron filtering subassembly includes: the magnetron comprises a shielding box, a coil and a feedthrough capacitor assembly, wherein a cathode terminal of a magnetron is arranged at the bottom of the shielding box in a penetrating manner, and one end of the cathode terminal is connected with a cathode of the magnetron; the coil is arranged in the shielding box, one end of the coil is connected with the other end of the cathode wiring terminal, and the coil is wound by a conductive wire with a non-circular cross section; the feedthrough capacitor assembly penetrates through the side wall of the shielding box and comprises a lead-out wire led out from the inside of the shielding box, and the lead-out wire is connected with the other end of the coil. Through the mode, the size of the shielding box can be reduced, and the filtering effect is enhanced.)

1. A magnetron filter assembly, comprising:

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 coil is arranged in the shielding box, one end of the coil is connected with the other end of the cathode wiring terminal, and the coil is wound by a conductive wire with a non-circular cross section;

the feedthrough capacitor assembly penetrates through the side wall of the shielding box and comprises a lead-out wire led out from the inside of the shielding box, and the lead-out wire is connected with the other end of the coil.

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 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 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 magnetron filtering assembly of claim 1,

the coil is formed by winding a flat wire, wherein the flat surface of the flat wire is parallel to the axis of the coil.

6. The magnetron filtering assembly of claim 5,

the coil comprises a magnetic core section and a hollow core section;

wherein the number of turns of the magnetic core segment is more than that of the hollow segment.

7. The filter assembly of claim 6,

the turn-to-turn distances of the magnetic core section and the hollow core section are equal.

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

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, and when the magnetron works, high-frequency harmonic waves are generated, a part of the high-frequency harmonic waves are radiated outwards through a cathode outgoing line of the magnetron, so that the outer part of the magnetron is easy to be ignited, and electromagnetic interference is generated 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 problems that a shielding box in the prior art is too large in size and not strong in filtering effect.

To solve the above technical problem, a first aspect of the present application provides a magnetron filter assembly, including: the magnetron comprises a shielding box, a coil and a feedthrough capacitor assembly, wherein a cathode terminal of a magnetron is arranged at the bottom of the shielding box in a penetrating manner, and one end of the cathode terminal is connected with a cathode of the magnetron; the coil is arranged in the shielding box, one end of the coil is connected with the other end of the cathode wiring terminal, and the coil is wound by a conductive wire with a non-circular cross section; the feedthrough capacitor assembly penetrates through the side wall of the shielding box and comprises a lead-out wire led out from the inside of the shielding box, and the lead-out wire is connected with the other end of the coil.

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 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 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 device comprises an inner shell, an outer shell, a first pin, a second pin, a first capacitor and a second capacitor. The inner shell is arranged in the shielding box to form a first accommodating cavity; the outer shell is arranged outside the shielding box to form 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 a first capacitor is connected with the first pin, and the other end of the first capacitor is grounded; one end of the second capacitor is connected with the second pin, and the other end of the second capacitor is grounded.

The coil is formed by winding a flat wire, wherein the flat surface of the flat wire is parallel to the axis of the coil.

The coil comprises a magnetic core section and a hollow core section; wherein the number of turns of the magnetic core segment is more than that of the hollow segment.

Wherein, the turn-to-turn pitch of the magnetic core section and the hollow core section is equal.

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, the magnetron filtering subassembly of this application includes shielding box, coil and punching electric capacity subassembly, wherein, the cathode wiring end of magnetron runs through and sets up in the bottom of shielding box, the cathode of magnetron is connected to the one end of cathode wiring end, the coil sets up in shielding box, the other end of cathode wiring end is connected to the one end of coil, the cross section of coil is the winding of the electric lead of non-perfect circle shape, the punching electric capacity subassembly runs through and sets up in the lateral wall of shielding box, and this punching electric capacity subassembly includes the lead-out wire of drawing forth in the shielding box mutually, the other end of coil is connected to this. This application regards as choke coil with the coil that the winding of non-circular wire formed, can shorten the length of coil greatly, and the occupation space of coil also reduces thereupon, and then reduces the volume of shielding box.

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 structural diagram of an embodiment of the coil of the present application;

FIG. 4 is a detail view of region A12 of FIG. 3;

FIG. 5 is a cross-sectional view of an embodiment of the circular coil of the present application;

FIG. 6 is a cross-sectional view of an embodiment of the flat coil of the present application

FIG. 7 is a schematic block diagram of the structure of an embodiment of a magnetron of the present application;

FIG. 8 is a block diagram illustrating a structure of an embodiment of a home appliance according to 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 a magnetron (not shown) constituting 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.

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, and 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, so that the distribution of the choke coil 100 in the shielding box is not concentrated, and the shielding box 300 and each filtering device need to keep a certain distance, which leads to the shielding box 300 having a larger volume and is difficult to optimally design the size of the magnetron.

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 magnetron filter assembly 10 of the present embodiment includes: a shield can 11, a coil 12 and a feedthrough capacitor assembly 13. Wherein, a cathode terminal 14 of the magnetron is arranged at the bottom of the shielding box 11 in a penetrating way, and one end of the cathode terminal 14 is connected with a cathode (not shown) of the magnetron; the coil 12 is arranged in the shielding box 11, one end of the coil 12 is connected with the other end of the cathode terminal 14, and the coil 12 is wound by a conductive wire with a non-circular cross section; the feedthrough capacitor assembly 13 is disposed through a side wall of the shield case 11, the feedthrough capacitor assembly 13 includes a lead wire 131 led out into the shield case 11, and the lead wire 131 is connected to the other end of the coil 12.

The cathode terminal 14 includes a first cathode terminal 141 and a second cathode terminal 142, and the first cathode terminal 141 and the second cathode terminal 142 are respectively connected to two ends of the cathode of the magnetron. The 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 141, and one end of the second coil 122 is connected to a second cathode terminal 142. 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 inside the shielding box 11 to form a first accommodating chamber (not shown), and the outer housing 133 is disposed outside the shielding box 11 to form a second accommodating chamber (not shown); first pin 134 is connected to first lead 1311 and led out of outer case 133, and second pin 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 with the first pin 134, the other end of the first capacitor is grounded, and the third end of the first capacitor is connected with the first outgoing line 1311; one end of the second capacitor is connected to the second pin 135, 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.

Wherein, the cavity of the shielding box 11 includes: the first cavity 111 close to the feedthrough capacitor assembly 13 and the second cavity 112 far from the feedthrough capacitor assembly 13 are divided based on the penetration position of the cathode terminal 14, the dividing manner of the embodiment refers to the dotted line OP, and the coil 12 is disposed in the first cavity 111. It should be noted that the division of the first chamber 111 and the second chamber 112 is only a schematic division for convenience of location description, and does not indicate that the first chamber 111 and the second chamber 112 are separated into independent chambers by a baffle or the like.

In this embodiment, a coil 12 wound with a conductive wire having a non-circular cross section is used as a choke coil to filter high-frequency harmonics. Coil that the wire coiling of non-normal circular formed, its distributed capacitance is less, the filter effect is better stable, compare in the coil that the cross-section is normal circular shape wire coiling, the coil that the cross-section was formed for the wire coiling of non-normal circular shape can adopt less number of turns to realize the same filter effect, the length of the choke coil that significantly reduces, make the occupation space of coil 12 in the shielding box only at first cavity 111, and coil 12 need not to rely on crooked wire connection to lead-out wire 131 and cathode connection terminal 14, make the position of coil 12 concentrate more, and then reduce width M and the width N of shielding box 11, finally reach the purpose that reduces shielding box 11 volume.

In one embodiment, the coil 12 is wound from flat wire. Specifically, referring to fig. 3, the flat wire used for winding the coil 12 has two flat surfaces a and b, the flat surfaces a and b of the flat wire are parallel to the axis of the coil 12 (i.e. the central axis of the coil 12), and after the flat wire is wound into the coil 12, the two flat surfaces a and b of the flat wire are respectively the outermost side of the coil and the side in contact with the magnetic core, so that the relative area of adjacent turns of the choke coil can be reduced, thereby reducing the distributed capacitance of the choke coil and enhancing the filtering effect.

Specifically, referring to fig. 4, fig. 4 is a schematic view of a region a12 in fig. 3. The flat wire is a wire having different thicknesses in two perpendicular directions with respect to the center of the cross section. For example, the cross-sectional shape of the flat wire may be rectangular, elliptical, trapezoidal, or the like. Taking a rectangle as an example, the coil is provided with oppositely arranged planes a, b, c and d, wherein the plane a is opposite to the plane b, and the plane c is opposite to the plane d, wherein the plane with wider width is a flat plane, for example, the width of the plane a and the plane b is larger than that of the plane c and the plane d, and the plane a and the plane b are flat planes, when the coil 12 is wound, the plane a and the plane b are wound in parallel with the axis of the coil 12.

On the one hand, according to geometric principles, the circumference of a circle is the smallest for shapes of the same area. Due to the skin effect, high frequency current is only transmitted at the surface of the wire. Therefore, the larger the cross-sectional perimeter of the coil, the smaller the high-frequency current density. And the voltage between each turn of coil is the same for coils with the same number of turns and diameter. According to the definition of capacitanceIt is known that when the surface charge Q of the adjacent conductors is small and the voltage U between the conductors is constant, the capacitance between the two conductors is small. Since the current density on the surface of the flat copper wire is small, the amount of electric charge accumulated on the surface of the flat copper wire at any time is small, and therefore, according to the formula, the coil wound by using the flat wire has small distributed capacitance, stable filtering effect and strong consistency. The length of the coil can be greatly reduced by winding the coil by using the flat wire, so that the occupied area of the coil is reduced.

On the other hand, the turn pitch of the coil wound by the flat wire is smaller than that of the coil wound by the circular wire. Specifically, referring to fig. 5 and 6 in combination, fig. 5 is a cross-sectional view of an embodiment of the circular coil of the present application, and fig. 5 shows two adjacent circular coils 201 and 202, where the circular wire used for winding the coils has a cross-sectional radius of r and a turn pitch of d0, and has a distributed capacitance of c₀Can be expressed as:

FIG. 6 is a cross-sectional view of an embodiment of the flat coil of the present application, where FIG. 6 shows two adjacent turns of flat coils 201 and 202 having a cross-sectional width w and a turn pitch d1, and a distributed capacitance c₁Can be expressed as:

in the case of both distributed capacitances being the same, i.e. c₀＝c₁During the process, the following relationship between the coil wound by the flat wire and the coil turn pitch wound by the round wire can be obtained:

thus, with a coil wound with flat wire, the turn pitch is reduced. For the coil 12 of the present embodiment, the coil 12 has a small turn pitch, which results in a short coil length, and the occupied space of the coil 12 along the central axis direction thereof is reduced, thereby achieving the purpose of reducing the volume of the shielding box 11.

Further, with continued reference to fig. 3, the coil 12 includes a core segment 1201 and an air core segment 1202, wherein the number of turns in the core segment 1201 is greater than the number of turns in the air core segment 1202. Core segment 1201 includes core 1203. The first coil 121 and the second coil 122 are the same coil, and each includes a magnetic core segment and an air core segment.

Further, the turns of the core segment 1201 and the core segment 1202 are equally spaced. In the prior art, because the turn-to-turn distances of the air core section and the magnetic core section of the choke coil are different, the coil has a loose wire part with a large turn-to-turn distance and a dense wire part with a small turn-to-turn distance, the winding process is complex and difficult to control, and the equal turn-to-turn distance winding process of the coil of the embodiment is easy to control, simple in manufacturing process and easy to realize.

Alternatively, the number of turns in the core segment 1201 is 6-8 turns and the number of turns in the air core segment 1202 is 2-4 turns. It is understood that the skilled person can design the number of turns of the magnetic core segment 1201 and the air core segment 1202 according to the practical requirement through the electromagnetic compatibility test.

Alternatively, the axis of the coil 12 (i.e., the central axis of the coil 12) is located on the same straight line as the line connecting the cathode terminal 14 and the lead-out wire 131. Specifically, the axis of the first coil 121 is located on the same straight line as the line connecting the first cathode terminal 141 and the first lead wire 1311, and the axis of the second coil 122 is located on the same straight line as the line connecting the second cathode terminal 142 and the second lead wire 1312. In this way, the first coil 121 and the second coil 122 can be fixed at positions close to the center of the shielding box 11, so that the positions of the filters are highly concentrated, the occupied space is reduced, and the volume of the shielding box 11 is effectively 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 coil 12 is shortened as much as possible, and the transverse occupied space of the shield box 11 is reduced, thereby reducing the volume of the shield box.

In another embodiment, 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 capacitor and the second capacitor are directly connected to the first coil 121 and the second coil 122 without connecting the first capacitor and the first coil 121 through the first outgoing line 1311, and the second outgoing line 1312 connects the second capacitor and the second coil 122, so that the lengths of the first outgoing line 1311 and the second outgoing line 1312 are omitted, the distance between the coil 12 and the feedthrough capacitor assembly 13 is further reduced, and the spatial positions of the filter devices are concentrated.

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.

Alternatively, the core 1203 may be made of ferrite material or amorphous material, and the shape of the core 1203 may be a ring shape or a cylindrical shape, and those skilled in the art may select the material and the shape and size of the core according to the noise spectrum characteristics of different types of magnetrons, which is not described herein.

Optionally, an insulating material is placed inside 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 in 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 coil 12 or the like, or the solid or liquid insulating material may be attached to the inner wall of the shield case 11, 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. The insulating material may be added with a material that absorbs electromagnetic waves.

Specifically, in the specific embodiment in which the solid insulating material is disposed in the shielding box 11, the shielding cover made of the insulating material may be disposed on the coil 12 to prevent an ignition phenomenon between the 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 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 further disposed on a portion of the upper cover of the shielding box 11 corresponding to the coil 12, for example, the insulating material may be adhered to the upper cover of the shielding box 11 by a high temperature resistant adhesive, or the insulating material may be fixed inside the upper cover of the shielding box 11 by a screw made of the high temperature resistant insulating material, so that when the distance between the coil 12 and the shielding box 11 is small, the contact between the coil 12 and the shielding box 11 is blocked, so as to prevent an ignition phenomenon from occurring between the 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 coil 12 may be further reduced, so as to reduce the volume of the shielding box 11.

Among these, the insulating material may be, for example, a ferrite material, which is the most common microwave-absorbing material and is readily available. Utilize ferrite material to make the shield cover, can obstruct shielding box 11 and coil 12 contact on the one hand, avoid producing the phenomenon of striking sparks between coil 12 and the casing of shielding box 11, on the other hand, ferrite material can absorb the high frequency harmonic of radiation in the shielding box 11 space, further the outside radiation of separation high frequency harmonic. The insulating material may also be high temperature resistant plastic or ceramic, which serves as an insulating substance and also functions to block the coil 12 from contacting the housing of the shielding box 11, and will not be described herein again.

Different from the prior art, the embodiment uses the coil 12 wound by the flat wire as the choke coil, so as to greatly shorten the length of the choke coil, concentrate the position relationship between the coil 12 and other filter elements, further reduce the occupied space between the coil 12 and other filter elements, finally achieve the purpose of reducing the volume of the shielding box 11, and realize the size miniaturization design of the magnetron. Meanwhile, the filter devices such as the coil 12 and the like are arranged at the source of the high-frequency interference, interference filtering is carried out at the source, and filtering stability is enhanced.

Referring to fig. 7, fig. 7 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 uses the coil wound by the non-circular wire as the choking coil to carry out high-frequency harmonic suppression, on one hand, the number of turns of the choking coil in the shielding box is reduced under the condition that the filtering component can suppress electromagnetic waves, the material cost of the choking coil is saved, and the manufacturing process of the choking coil is simplified under the condition that the number of turns of the choking 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. 8, fig. 8 is a schematic structural diagram of an embodiment of a household appliance provided in the present application. The household appliance 30 comprises a magnetron 31. In the magnetron 31 provided in the above embodiment, since the magnetron filter assembly provided in any of the above embodiments is present in the magnetron 31, 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.