CN112786413B - Magnetron filter assembly, magnetron and household appliance - Google Patents

Abstract

The application discloses a magnetron filter assembly, a magnetron and a household appliance, wherein the magnetron filter assembly comprises: the magnetron comprises a shielding box, a coil and a penetrating capacitor assembly, wherein a cathode terminal of a magnetron is arranged at the bottom of the shielding box in a penetrating way, 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 terminal, and the coil is wound by a conducting wire with a non-circular cross section; the core-penetrating capacitor assembly penetrates through the side wall of the shielding box and comprises an outgoing line led out of the shielding box, and the outgoing line 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.

Description

Magnetron filter assembly, magnetron and household appliance

Technical Field

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

Background

The magnetron is an electric vacuum device for generating microwave energy, high-frequency harmonic waves are generated when the magnetron works, a part of the high-frequency harmonic waves radiate outwards through a cathode lead-out wire of the magnetron, the magnetron is easy to fire, and electromagnetic interference is generated on surrounding devices to influence the working efficiency of the magnetron.

The current stage generally uses a filtering component to filter out noise led out from the cathode terminal of the magnetron, so as to improve the EMC performance (electromagnetic compatibility) of the magnetron. The filter assembly thus 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 at zero potential, so that in order to avoid ignition between the shielding box and the filter assembly, the distance between the shielding box and the filter assembly must be ensured, so that the shielding box has a larger volume, which is extremely unfavorable for the miniaturization design of the size of the magnetron.

Disclosure of Invention

The application mainly provides a magnetron filter assembly, a magnetron and a household appliance, which can solve the problems of overlarge size and weak filter effect of a shielding box in the prior art.

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 penetrating capacitor assembly, wherein a cathode terminal of a magnetron is arranged at the bottom of the shielding box in a penetrating way, 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 terminal, and the coil is wound by a conducting wire with a non-circular cross section; the core-penetrating capacitor assembly penetrates through the side wall of the shielding box and comprises an outgoing line led out of the shielding box, and the outgoing line is connected with the other end of the coil.

Wherein, the cavity of shielding box includes: 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 lines comprise a first outgoing line and a second outgoing line, the first outgoing line is connected with the other end of the first coil, and the second outgoing line is connected with the other end of the 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 the 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.

Wherein the coil comprises a magnetic core section and an air core section; wherein the number of turns of the core segment is greater than the number of turns of the air core segment.

The inter-turn distances of the magnetic core sections and the hollow core sections are 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, comprising: a magnetron main body; the magnetron filter assembly is arranged on the magnetron main body and is used for consuming electromagnetic waves transmitted from the magnetron main body, and the magnetron filter assembly is as the magnetron filter assembly provided in the first aspect.

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 effects of the application are as follows: the magnetron filter assembly comprises a shielding box, a coil and a penetrating capacitor assembly, wherein a cathode wiring terminal of the magnetron is arranged at the bottom of the shielding box in a penetrating mode, one end of the cathode wiring 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, a conducting wire with a non-circular cross section is wound, the penetrating capacitor assembly is arranged on the side wall of the shielding box in a penetrating mode, and the penetrating capacitor assembly comprises an outgoing line led out from the shielding box and connected with the other end of the coil. The application takes the coil wound by the non-circular lead as the choke coil, can greatly shorten the length of the coil, and reduces the occupied space of the coil, thereby reducing the volume of the shielding box.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:

FIG. 1 is a schematic diagram of one embodiment of a prior art magnetron filter assembly;

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

FIG. 3 is a schematic diagram of an embodiment of a coil of the present application;

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

FIG. 5 is a cross-sectional view of one embodiment of a 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 block diagram illustrating a schematic structure of an embodiment of a magnetron of the application;

Fig. 8 is a block diagram schematically illustrating the structure of an embodiment of the home appliance of the present application.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

The terms "first" and "second" in the present 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 defining "a first" or "a second" may explicitly or implicitly include at least one such feature. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may 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 may be included in at least one embodiment of the application. The appearances of such phrases 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 of skill in the art will explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

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

Wherein the shield case 300 is connected to a magnetron (not shown) to form a part of the magnetron. The cathode lead 400 of the magnetron is penetrated through the bottom of the shielding box 300 to lead out high frequency harmonic waves generated during the normal operation of the magnetron. The shield case 300 is formed of a metal plate to surround the choke coil 100, and forms a closed space therein to protect the choke coil 100 and its circuit connection, and on the other hand, the shield case 300 can block a path of high frequency harmonic radiation to the space so that the high frequency harmonic is not radiated outward only in the closed space of the shield case 300.

The feedthrough capacitor 200 is connected to the choke coil 100 by connecting wires through the shield case 300 to supply power to the magnetron, one end of the choke coil 100 is connected to the 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 core segment 101 and an air core segment 102, and the inter-turn distances between the core segment 101 and the air core segment 102 are different.

The choke coil 100 has a certain length under the influence of the filtering effect, two ends of the choke coil 100 are respectively connected with the cathode lead-out wire 400 and the feedthrough capacitor 200 by using bent wires, and the central axis of the choke coil 100 is far away from the connection wire of the cathode lead-out wire 400 and the feedthrough capacitor 200, so that the choke coil 100 is not distributed in the shielding box and occupies a larger space, and a certain distance is required between the shielding box 300 and each filtering device, thus the shielding box 300 has a larger 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 filter assembly according to an embodiment of the application.

The magnetron filter assembly 10 of the present embodiment includes: shield can 11, coil 12 and feedthrough capacitor assembly 13. Wherein a cathode terminal 14 of the magnetron is penetratingly provided at the bottom of the shield case 11, and one end of the cathode terminal 14 is connected to 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 conducting wire with a non-circular cross section; the feedthrough capacitor assembly 13 is disposed on a side wall of the shield case 11 in a penetrating manner, and the feedthrough capacitor assembly 13 includes a lead-out wire 131 led out into the shield case 11, and the lead-out wire 131 is connected to the other end of the coil 12.

Wherein 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 connected to both ends of the magnetron cathode, respectively. The coil 12 includes a first coil 121 and a second coil 122, one end of the first coil 121 is connected to the first cathode terminal 141, and one end of the second coil 122 is connected to the second cathode terminal 142. The lead wire 131 includes a first lead wire 1311 and a second lead wire 1312, the first lead wire 1311 being connected to the other end of the first coil 121, and the second lead wire 1312 being connected to the other end of the second coil 122.

Further, the feedthrough capacitor assembly 13 further includes: an inner housing 132, an outer housing 133, a first pin 134, a second pin 135. Wherein, the inner shell 132 is disposed in the shielding box 11 to form a first accommodating cavity (not shown), and the outer shell 133 is disposed outside the shielding box 11 to form a second accommodating cavity (not shown); the first lead 134 is connected to the first lead 1311 and led out from the outer case 133, and the second lead 135 is connected to the second lead 1312 and led out from the outer case 133.

Further, in the first and second accommodation chambers formed by the inner and outer cases 132 and 133, first and second capacitances (the first and second capacitances are not shown in the drawing) are provided. One end of the first capacitor is connected to the first pin 134, 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; 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 outgoing line 1312.

Wherein the cavity of the shielding cage 11 comprises: 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, and the coil 12 is disposed in the first cavity 111 in the manner of dividing the first cavity 111 by referring to the dashed line OP. It should be noted that the division of the first cavity 111 and the second cavity 112 is only for convenience of the schematic division of the position description, and does not represent that the first cavity 111 and the second cavity 112 are separated into separate cavities by using a physical object such as a baffle.

The present embodiment uses a coil 12 formed by winding a conductive wire having a non-circular cross section as a choke coil, and filters high-frequency harmonics. The coil formed by winding the non-circular conducting wire has smaller distributed capacitance and better and stable filtering effect, compared with the coil formed by winding the conducting wire with the cross section being in a perfect circle shape, the coil formed by winding the conducting wire with the cross section being in a non-perfect circle shape can adopt fewer turns to realize the same filtering effect, the length of the choke coil is greatly reduced, the occupied space of the coil 12 in the shielding box is only in the first cavity 111, the coil 12 is not required to be connected to the outgoing line 131 and the cathode terminal 14 by virtue of the bent conducting wire, the position of the coil 12 is more concentrated, the width M and the width N of the shielding box 11 are further reduced, and the purpose of reducing the volume of the shielding box 11 is finally achieved.

In one embodiment, the coil 12 is wound from a 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 flat surfaces a and b of the flat wire are respectively the outermost side of the coil and the side contacting with the magnetic core, so that the relative area of adjacent turns of the choke coil can be reduced, the distributed capacitance of the choke coil can be reduced, and the filtering effect can be enhanced.

Specifically, referring to fig. 4, fig. 4 is a schematic diagram of a region a12 in fig. 3. The flat line is a line having different thicknesses in two directions perpendicular to each other at 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, it has oppositely disposed planes a, b, c and d, where plane a and plane b are opposite, plane c and plane d are opposite, where the wider width planes are flat planes, for example, the widths of plane a and plane b are greater than the widths of plane c and plane d, and plane a and plane b are flat planes, and when winding the coil 12, the plane a and plane b are wound parallel to the axis of the coil 12.

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

On the other hand, the coil wound with a flat wire has a smaller inter-turn distance than the coil wound with a round wire. Specifically, referring to fig. 5 and 6 in combination, fig. 5 is a cross-sectional view of an embodiment of a circular coil of the present application, fig. 5 shows two adjacent circular coils 201 and 202, a circular wire used for winding the coils has a radius of r, a pitch of d0, and a distributed capacitance c ₀ can be expressed as:

fig. 6 is a cross-sectional view of an embodiment of the flat coil of the present application, fig. 6 shows two adjacent turns of the flat coils 201 and 202, the coil has a cross-sectional width w, the turns have a spacing d1, and the distributed capacitance c ₁ can be expressed as:

Under the condition that the distributed capacitance of the coil and the coil is the same, namely, when c ₀＝c₁ is adopted, the relationship between the coil turn spacing of the coil wound by the flat wire and the coil turn spacing of the coil wound by the round wire is as follows:

Therefore, the coil wound by the flat wire has a reduced inter-turn distance. For the coil 12 of the present embodiment, the coil 12 has a small inter-turn distance, resulting in a short coil length, and the occupied space of the coil 12 in the direction of its center axis is reduced, eventually achieving the purpose of reducing the volume of the shield case 11.

Further, with continued reference to fig. 3, the coil 12 includes a core segment 1201 and a core segment 1202, wherein the core segment 1201 has more turns than the core segment 1202. The core segment 1201 includes a core 1203. The first coil 121 and the second coil 122 are identical coils, and each includes a core segment and an air core segment.

Further, the inter-turn distances of the core segment 1201 and the air core segment 1202 are equal. In the prior art, the space between the turns of the hollow section and the turn with the magnetic core section of the choke coil is inconsistent, so that the coil has a sparse wire part with a large turn space and a dense wire part with a small turn space, the winding process is complex, the winding process is difficult to control, and the equal turn space winding process of the coil of the embodiment is easy to control, and the manufacturing process is simple and easy to realize.

Alternatively, there may be 6-8 turns of core segment 1201 and 2-4 turns of hollow core segment 1202. It will be appreciated that those skilled in the art may make appropriate designs for the number of turns of the core segment 1201 and the hollow segment 1202 through electromagnetic compatibility testing as desired.

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

Alternatively, the length of the first and second pinouts 1311, 1312 is 5-10 millimeters. The connecting distance between the feedthrough capacitor assembly 13 and the coil 12 is shortened as much as possible, and the lateral occupation space of the shielding box 11 is reduced, thereby reducing the volume of the shielding box.

In other embodiments, the first coil 121 and the second coil 122 may be integrated onto the feedthrough capacitor assembly 13, i.e., 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 lead 1311, and the second lead 1312 connects the second capacitor and the second coil 122, so that the lengths of the first lead 1311 and the second lead 1312 are ignored, the distance between the coil 12 and the feedthrough capacitor assembly 13 is further reduced, and the spatial positions of the respective filters are concentrated.

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

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

Optionally, an insulating material is placed in the shielding cage 11. In this embodiment, the insulating material may be present in a number of different ways. For example, when 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 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 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, plastic and its products, glass, ceramic products, mica, asbestos and its products or the like. The insulating material may be further added with a material for absorbing electromagnetic waves.

Specifically, in the 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 above the coil 12, so as to avoid a sparking phenomenon between the coil 12 and the housing of the shielding box 11, 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 the portion of the upper cover of the shielding case 11 corresponding to the coil 12, for example, the insulating material may be adhered to the upper cover of the shielding case 11 by using a high temperature resistant adhesive, or the insulating material may be fixed inside the upper cover of the shielding case 11 by using a screw made of a high temperature resistant insulating material, so that when the distance between the coil 12 and the shielding case 11 is small, the contact between the coil 12 and the shielding case 11 is blocked, so as to prevent the ignition phenomenon between the coil 12 and the upper cover of the shielding case 11, and the distance between the upper cover of the shielding case 11 and the coil 12 may be further reduced, thereby reducing the volume of the shielding case 11.

The insulating material may be, for example, ferrite material, which is the most common material absorbing microwaves, and is easy to obtain. The shielding cover is made of ferrite materials, so that the shielding box 11 can be prevented from being contacted with the coil 12, a sparking phenomenon is avoided between the coil 12 and a shell of the shielding box 11, and on the other hand, the ferrite materials can absorb high-frequency harmonic waves radiated in the space of the shielding box 11, and further prevent the high-frequency harmonic waves from radiating outwards. The insulating material may also be a high temperature resistant plastic or ceramic, and the high temperature resistant plastic and ceramic serve as insulating materials, and also can play a role in blocking the contact between the coil 12 and the housing of the shielding box 11, which is not described herein.

Compared with the prior art, the embodiment uses the coil 12 wound by the flat wire as the choke coil, greatly shortens the length of the choke coil, concentrates the position relationship between the coil 12 and other filter elements, further reduces the occupied space of the coil 12 and other filter elements, finally achieves the purpose of reducing the volume of the shielding box 11, and realizes 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 high-frequency interference, and interference filtering is carried out at the source, so that the filtering stability is enhanced.

Referring to fig. 7, fig. 7 is a schematic structural diagram of a magnetron according to an embodiment of the application. The magnetron 20 includes a magnetron body 21 and a magnetron filter assembly 22. The magnetron filter assembly 22 is disposed on the magnetron main body 21 and is used for consuming electromagnetic waves coming out of the magnetron main body 21, and the magnetron filter assembly 22 is provided in any of the above embodiments. The components and the functions and positional relationships of the components contained in the magnetron filter assembly 22 are described in detail in the above embodiments, and are not described here again.

The magnetron filter assembly uses the coil wound by the non-circular wire as the choke coil to perform high-frequency harmonic suppression, on one hand, the number of turns of the choke coil in the shielding box is reduced under the condition that the filter assembly can suppress 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 size of the shielding box can be reduced, and finally the size of the magnetron is reduced.

Referring to fig. 8, fig. 8 is a schematic structural view of an embodiment of a household appliance according to the present application. The home appliance 30 includes a magnetron 31. Among them, the magnetron 31 is provided as the above embodiment, and since the magnetron filter assembly provided as any of the above embodiments exists in the magnetron 31, the volume of the home appliance 30 is reduced due to the reduced volume of the magnetron filter assembly. The household appliance 30 is for example a microwave oven.

The foregoing description is only illustrative of the present application and is not intended to limit the scope of the application, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present application.

Claims (7)

1. A magnetron filter assembly, the magnetron filter assembly comprising:

The cathode wiring terminal of the magnetron is arranged at the bottom of the shielding box in a penetrating way, and one end of the cathode wiring terminal is connected with the cathode of the magnetron; 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 is arranged in the shielding box, the coil comprises a first coil and a second coil, one end of the first coil is connected with the first cathode terminal, one end of the second coil is connected with the second cathode terminal, and the coil is wound by a conductive wire with a non-circular cross section;

The through capacitor assembly penetrates through the side wall of the shielding box, and the first coil and the second coil are integrated on the through capacitor assembly;

The coil is a spiral coil and is wound by a flat wire, wherein the flat surface of the flat wire is parallel to the axis of the coil; the flat line comprises a first plane, a second plane, a third plane and a fourth plane, wherein the first plane and the second plane are oppositely arranged, the third plane and the fourth plane are oppositely arranged, and the width of the first plane and the second plane is larger than the width of the third plane and the width of the fourth plane; the first plane and the second plane are the flat planes; the coil turn pitch formed by winding the flat wire is smaller than the turn pitch of a round wire winding coil;

The shielding box is internally provided with an insulating material which is solid or liquid, the insulating material is added with a material for absorbing electromagnetic waves, and the insulating material is wrapped on the coil.

2. The magnetron filter assembly of claim 1 wherein,

The cavity of the shielding box comprises: 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 filter assembly of claim 1, wherein the filter assembly comprises,

The feedthrough capacitor assembly further comprises:

The inner shell is arranged in the shielding box and forms 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 other end of the first coil and is led out from the outer shell;

the second pin is connected with the other end of the second coil 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.

4. The magnetron filter assembly of claim 1 wherein,

The coil comprises a magnetic core section and an air core section;

wherein the number of turns of the core segment is greater than the number of turns of the air core segment.

5. The filter assembly of claim 4, wherein the filter assembly comprises,

The inter-turn distances of the magnetic core sections and the hollow core sections are equal.

6. A magnetron, the magnetron comprising:

A magnetron main body;

a magnetron filter assembly provided on the magnetron body for consuming electromagnetic waves coming out of the magnetron body, the magnetron filter assembly being as claimed in any one of claims 1 to 5.

7. A household appliance is characterized in that,

The household appliance includes a magnetron as claimed in claim 6.