CN112786409A

CN112786409A - Magnetron filtering component, magnetron and household appliance

Info

Publication number: CN112786409A
Application number: CN202011613448.2A
Authority: CN
Inventors: 朱军; 刘洪颐; 罗良敏; 杨志龙; 张昀; 王贤友; 唐相伟; 施志雄
Original assignee: Midea Group Co Ltd; Guangdong Midea White Goods Technology Innovation Center Co Ltd
Current assignee: Midea Group Co Ltd; Guangdong Midea White Goods Technology Innovation Center Co Ltd
Priority date: 2020-12-30
Filing date: 2020-12-30
Publication date: 2021-05-11

Abstract

The application discloses magnetron filtering subassembly, magnetron and domestic appliance, this magnetron filtering subassembly includes: the cathode terminal of the magnetron penetrates through the bottom of the shielding box, and one end of the cathode terminal is connected with the cathode of the magnetron; the feedthrough capacitor assembly penetrates through the side wall of the shielding box and comprises a lead-out wire led out into the shielding box, and the lead-out wire is connected with the cathode wiring terminal; and the consumption medium is sleeved on the cathode terminal and used for supporting the cathode terminal and also used for consuming the electromagnetic waves led out along the cathode terminal. In this way, the volume of the magnetron can be reduced.

Description

Magnetron filtering component, magnetron and household appliance

Technical Field

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

Background

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

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

Disclosure of Invention

In order to solve the above problems, the present application provides a magnetron filter assembly, a magnetron, and a home appliance, which can reduce the volume of the magnetron.

In order to solve the technical problem, the application adopts a technical scheme that: there is provided a magnetron filter assembly including: the cathode terminal of the magnetron penetrates through the bottom of the shielding box, and one end of the cathode terminal is connected with the cathode of the magnetron; the feedthrough capacitor assembly penetrates through the side wall of the shielding box and comprises a lead-out wire led out into the shielding box, and the lead-out wire is connected with the cathode wiring terminal; the consumption medium is sleeved on the cathode terminal, is used for supporting the cathode terminal and is also used for consuming electromagnetic waves led out along the cathode terminal; wherein the consumption medium is an insulating material.

Wherein, magnetron filtering subassembly still includes: and the hollow coil is arranged in the shielding box, one end of the hollow coil is connected with the cathode wiring terminal, and the other end of the hollow coil is connected with the outgoing line.

Wherein, the cavity of shielding box includes: the first cavity that is close to the punching electric capacity subassembly and the second cavity of keeping away from the punching electric capacity subassembly, first cavity and second cavity are based on the through position division of cathode terminal, and air core coil sets up in 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, and the other end of first coil is connected to first outgoing line, and the other end of second coil is connected to the second outgoing line.

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.

The magnetron filtering component also comprises an insulating gasket, and the insulating gasket is arranged on the inner top wall, the inner bottom wall and the inner side wall of the shielding box.

Wherein, the thickness of the insulating gasket is 1-3 mm.

Wherein, the consumption medium is ferrite material.

In order to solve the above technical problem, another technical solution adopted by the present application is: provided is a magnetron including: the magnetron filtering device comprises a magnetron main body and a magnetron filtering component, wherein the magnetron filtering component is arranged on the magnetron main body and used for consuming electromagnetic waves transmitted from the magnetron main body, and the magnetron filtering component is provided according to the technical scheme.

In order to solve the above technical problem, a further technical solution adopted by the present application is to provide a household appliance including a magnetron, the magnetron being provided as the magnetron according to the above technical solution.

The beneficial effects of the embodiment of the application are that: different from the prior art, the application provides a magnetron filtering component, which comprises a shielding box, a feedthrough capacitor and a consumption medium, wherein a cathode terminal of a magnetron penetrates through the bottom of the shielding box, and one end of the cathode terminal is connected with a cathode of the magnetron; the feedthrough capacitor assembly penetrates through the side wall of the shielding box, and a lead-out wire in the feedthrough capacitor assembly is connected with the cathode terminal; the consumption medium is sleeved on the cathode terminal and used for consuming the electromagnetic waves led out along the cathode terminal. By the mode, the high-frequency electromagnetic waves generated by the magnetron can be inhibited and consumed by using the consumption medium sleeved outside the cathode terminal, so that the filtering can be realized without arranging a coil in the filtering component, the size of the shielding box can be reduced, and finally the size of the magnetron is reduced.

Drawings

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

FIG. 1 is a schematic view showing a structure of a filtering assembly of a magnetron in the related art;

FIG. 2 is a schematic structural diagram of an embodiment of a magnetron filtering assembly provided herein;

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

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

FIG. 5 is a schematic structural diagram of a magnetron filtering assembly according to yet another embodiment of the present application;

FIG. 6 is a schematic diagram of a first insulating pad provided herein;

FIG. 7 is a schematic diagram of a second insulating liner provided herein;

FIG. 8 is a schematic structural diagram of an embodiment of a magnetron provided herein;

fig. 9 is a schematic structural diagram of an embodiment of a household appliance provided by the present application.

Detailed Description

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

The terms "first", "second", etc. in this application are used to distinguish between different objects and not to describe a particular order. Furthermore, the terms "include" and "have," 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. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

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

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

The inventor of the present application has found, through long-term research, that in some applications of a household appliance (for example, a microwave oven), the space occupancy rate of the inner cavity of the household appliance is small due to the overlarge volume of the magnetron, and the overlarge volume of the shielding box is an important reason that the volume of the magnetron is difficult to reduce. Based on this, the following examples are proposed:

referring to fig. 2, fig. 2 is a schematic structural diagram of an embodiment of a magnetron filter assembly provided in the present application, and as shown in fig. 2, the magnetron filter assembly 20 provided in the present embodiment includes a shielding box 21, a feedthrough capacitor assembly 22, and a consumption medium 23, and further includes a cathode terminal 24 disposed at the bottom of the shielding box 21, specifically, the cathode terminal 24 of the magnetron is disposed at the bottom of the shielding box 21 in a penetrating manner, and one end of the cathode terminal 24 is connected to a cathode (not shown) of the magnetron.

The feedthrough capacitor assembly 22 is arranged on the side wall of the shielding box 21 in a penetrating manner, the feedthrough capacitor assembly 22 comprises a lead-out wire 221 led out into the shielding box 21, and the lead-out wire 221 is connected with the other end of the cathode terminal 24; the consumption medium 23 is sleeved on the cathode terminal 24 and used for supporting the cathode terminal 24, and the consumption medium 23 is also used for consuming the electromagnetic waves led out along the cathode terminal 24. The consumption medium 23 is made of an insulating material, and can be used for isolating the cathode terminal 24 from the shielding box 21, thereby performing a high-voltage insulation function.

Alternatively, the dielectric medium 23 may be a ferrite material composed of a NiCuZn-based ferrite material containing predetermined amounts of iron oxide, copper oxide, zinc oxide, and nickel oxide as a main component and bismuth oxide, silicon oxide, magnesium oxide, and cobalt oxide as auxiliary components.

In other embodiments, the dissipative medium 23 can be insulating, high permeability, or high loss material of various materials. Moreover, the consumable medium 23 may be annular or cylindrical, and the length and width of the consumable medium 23 may be adjusted accordingly. The consumable medium 23 of the present embodiment is not limited to the above-described example as long as it can consume the electromagnetic waves in the shield case 21.

It is understood that the space occupancy of the dissipative medium 23 and the feedthrough capacitor assembly 22 in the magnetron filter assembly 20 provided in the present embodiment can be set as small as possible under the condition that certain filter conditions are satisfied, so that the volume of the shield case 21 of the magnetron can be reduced accordingly. For example, in order to reduce the volume of the shield case 21, the dissipative medium 23 having a large ability to absorb electromagnetic waves may be selected.

In a practical scenario, when the feedthrough capacitor assembly 22 is used for powering on, a filament in the magnetron emits thermal electrons at a temperature of about 2000K, the thermal electrons rotate in the action space, so as to generate an electric field of about 2450MHZ, the thermal electrons become harmonics under the action of the electric field and the magnetic field in the action space, and the harmonics are emitted to the outside through the antenna, not only a fundamental wave for cooking but also a high-frequency harmonic of integral multiple of the fundamental wave frequency are generated in the action space, and for the high-frequency harmonic, usually through the cathode terminal 24 connected to the cathode of the magnetron, the radiation is performed to the outside space through the consumption medium 23, after the material (such as ceramic) originally sleeved on the cathode terminal 24 is replaced by the consumption medium 23, the consumption medium 23 corresponds to a cathode insulation support column, that is to add a low pass filter to the cathode terminal 24, the low-pass filter can inhibit the interference of high-frequency electromagnetic waves led out from the cathode terminal 24, meanwhile, the ferrite material can play a role in shielding consumption due to the property of the material, the component of the high-frequency interference penetrating the consumption medium 23 to radiate to the space is reduced, the effect of filtering from the source is achieved, and the filtering effect is more stable.

In addition, the consumption medium 23 made of ferrite material is adopted, and the consumption medium 23 serves as a part of filter, so that the requirement of high-frequency interference suppression of the original magnetron filter assembly 20 is reduced, and the parameter selection of the magnetron filter assembly 20 has greater freedom, for example, in the embodiment, the normal level filter processing can be performed without arranging a coil, the volume of the shielding box 21 is reduced by canceling the coil while the Electromagnetic Compatibility (EMC) performance of the magnetron is ensured, and the volume of the magnetron is finally reduced, and the phenomenon that the coil and the shielding box 21 are subjected to discharge ignition is avoided, so that certain safety guarantee is provided. In addition, in the embodiment, the conventional coil is omitted, so that the problem that the turn-to-turn distances of the coils at two ends are different when the coil is provided with the hollow core section and the magnetic core section can be avoided, and the process procedure is simplified.

Referring to fig. 3, fig. 3 is a schematic structural diagram of another embodiment of the magnetron filter assembly provided in the present application, and the magnetron filter assembly 30 provided in the present embodiment includes a shielding box 31, an air-core coil 32, a feedthrough capacitor assembly 33, a consumption medium 34, and a cathode terminal 35 disposed at the bottom of the shielding box 31, specifically, the cathode terminal 35 of the magnetron wire is disposed at the bottom of the shielding box 31 in a penetrating manner, and one end of the cathode terminal 35 is connected to a cathode of the magnetron (not shown).

Wherein, the air-core coil 32 is arranged in the shielding box 31, and one end of the air-core coil 32 is connected with the cathode terminal 35; the feedthrough capacitor assembly 33 penetrates through the side wall of the shielding box 31, the feedthrough capacitor assembly 33 comprises an outgoing line 331 which is led out into the shielding box 31, and the outgoing line 331 is connected with the other end of the air-core coil 32; the consumption medium 34 is sleeved on the cathode terminal 35 for consuming the electromagnetic waves led out along the cathode terminal 35.

Alternatively, the cavity of the shielding box 31 may be divided into a first cavity 311 and a second cavity 312 based on the penetrating position of the cathode terminal 35 in the shielding box 31, wherein the first cavity 311 is disposed near the feedthrough capacitor assembly 33, the second cavity 312 is disposed far from the feedthrough capacitor assembly 33, and the air-core coil 32 is disposed in the first cavity 311.

In one embodiment, for dividing the cavity in the shielding box 31, the shielding box 31 may be divided into two cavities, for example, two rectangular parallelepiped cavities, by using the penetrating position of the cathode terminal 35 in the shielding box 31 and a plane parallel to the sidewall of the shielding box 31 through which the feedthrough capacitor assembly 33 penetrates. Wherein, the volume of the first cavity 311 is larger than the volume of the second cavity 312.

In this embodiment, the air-core coil 32 is limited in the first cavity 311 of the shielding box 31, so that the air-core coil 32 and the consumable medium 34 are both located in the first cavity 311, and the volume of the shielding box can be reduced by reducing the volume of the second cavity 312, that is, the volume of the shielding box on the side of the consumable medium 34 far away from the feedthrough capacitor assembly 33 is reduced, thereby reducing the space occupancy of the magnetron filter assembly 30 to a certain extent.

Therefore, compared to the prior art, when the magnetron filtering device 30 of the embodiment restricts the air-core coil 32 to be disposed in the first cavity 311 of the shielding box 31, that is, the number of turns of the original coil is reduced, the filtering effect of the air-core coil 32 and the feedthrough capacitor assembly 33 will be reduced appropriately. However, due to the consumption medium 34 sleeved outside the cathode terminal 35, the consumption medium 34 made of ferrite material is equivalent to adding a low-pass filter to the cathode terminal 35, which can suppress and consume the generated electromagnetic wave at the root, and reduce the component of the high-frequency interference radiating to the space through the consumption medium 34, thereby ensuring the filtering capability of the whole magnetron filtering component 30 to be stable, and reducing the volume of the shielding box.

It should be noted that the space occupancy rates of the air-core coil 32, the feedthrough capacitor assembly 33, and the consumable medium 34 can be determined by those skilled in the art or manufacturers according to practical situations, and will not be described herein too much.

Optionally, cathode terminal 35 includes a first cathode terminal 351 and a second cathode terminal 352, wherein first cathode terminal 351 and second cathode terminal 352 are respectively connected to two ends of the cathode, and specifically, air-core coil 32 is connected to a central guide rod and a side guide rod (not shown) of the cathode through cathode terminal 35. The air-core coil 32 includes a first coil 321 and a second coil 322, one end of the first coil 321 is connected to a first cathode terminal 351, and one end of the second coil 322 is connected to a second cathode terminal 352; the lead lines 331 include a first lead line 3311 and a second lead line 3312, one end of the first lead line 3311 being connected to the other end of the first coil 321, and the second lead line 3312 being connected to the other end of the second coil 322.

Further, the feedthrough capacitor assembly 33 further includes an inner housing 332, an outer housing 333, a first pin 334, a second pin 335, a first capacitor (not shown), and a second capacitor (not shown). The inner shell 332 is disposed in the shielding box 31 to form a first accommodating cavity, and the outer shell 333 is disposed outside the shielding box 31 to form a second accommodating cavity; the first pin 334 is connected with the first outgoing line 3311 and led out from the outer shell 333, the second pin 335 is connected with the second outgoing line 3312 and led out from the outer shell 333, and the other ends of the first pin 334 and the second pin 335 can be connected with a power supply after led out from the outer shell 333 and used for supplying power for the work of the whole magnetron; one end of the first capacitor is connected to the first pin 334, the other end is grounded, one end of the second capacitor is connected to the second pin 335, and the other end is grounded.

In other embodiments, as shown in fig. 4, fig. 4 is a schematic structural diagram of a magnetron filtering component according to still another embodiment provided in the present application, in this embodiment, a consuming medium 34 may be further disposed on the outgoing line 331 of the feedthrough capacitor assembly 33, at this time, the consuming medium 34 can absorb electromagnetic waves propagated from the cathode terminal 35 into the shield box 31, and therefore, the number of turns of the air-core coil 32 can be reduced to some extent by the existence of the consuming medium 34, so that the volume of the shield box 31 can be reduced, and finally, the volume of the magnetron can be reduced.

In a practical scenario, the cathode terminal 35 of the magnetron body leads the electromagnetic waves generated by the magnetron body from the emission cavity into the interior of the shield box 31, and the electromagnetic waves are filtered by the air-core coil 32, the dissipative medium 34 and the partial feedthrough capacitor assembly 33 inside the shield box 31.

Further, in this embodiment, on the basis of the conventional magnetron structure, the choke coil is replaced with the hollow core segment, that is, the hollow core coil 32 in this embodiment, because only the hollow core segment is reserved, the inter-turn distances of the coils are the same, the processing process can be simpler, and the consistency is better.

Similarly, the shielding box 31 may be divided into the first cavity 311 and the second cavity 312 based on the penetrating position of the cathode terminal 35 in the shielding box 31, once the positions of the cathode terminal 35 and the feedthrough capacitor assembly 33 are determined, the air-core coil 32 is located in the cavity close to the feedthrough capacitor assembly 33, and under the condition that the turn-to-turn distance between every two turns of the air-core coil 32 is fixed, the number of turns of the air-core coil 32 can be determined, and further the length of the air-core coil 32 in the axial direction can be determined, so that the position or the space occupancy of the air-core coil 32 in the shielding box 31 can be changed by changing the positions of the cathode terminal 35 and the lead wire 331 in the feedthrough capacitor assembly 33, for example, by shortening the distance between the cathode terminal 35 and the lead wire 331 of the feedthrough capacitor assembly 33, the distance corresponds to the length of the air-core coil 32 in the axial direction, so that the position space occupied by the air-core, that is, the first cavity 311 is reduced in volume, thereby further reducing the volume of the whole shield case 31 on the basis of the reduction in volume of the second cavity 312.

Optionally, the consuming medium 34 is at least partially embedded in the inner housing 332, i.e. the consuming medium 34 is at least partially located in the first receiving cavity, specifically, at least a part of the outer wall of the consuming medium 34 is attached to at least a part of the inner wall of the inner housing 332. At least a portion of the consumable media 34 is secured within the first receiving cavity, such as by an interference fit or welding. Therefore, in the present embodiment, by disposing at least part of the consumption medium 34 in the first accommodation cavity of the inner housing 332, the feedthrough capacitor assembly 33 overlaps at least part of the consumption medium 34, the space occupancy of the air core coil 32, the feedthrough capacitor assembly 33, and the consumption medium 34 in the shield case 31 can be further reduced, and the volume of the shield case 31 can be further reduced.

Due to the working characteristics of the magnetron, during normal operation, the magnetron filtering component 30 is connected with a negative high voltage, and in order to prevent the phenomenon of discharge and ignition between the air-core coil 32 and the shielding box 31 in the magnetron filtering component 30, the relative distance between the air-core coil 32 and the feedthrough capacitor component 33 and the shielding box 31 needs to be ensured during design. In the related art, air is used as an insulating medium to avoid the occurrence of the point discharge phenomenon, and there is a disadvantage that the volume of the shielding box 31 is inevitably too large due to the use of air as an insulating medium, so that the overall volume of the magnetron is increased, and thus, the volume of the household appliances such as the microwave oven is large and the effective use area is small. In addition, because the structure uses air as a medium, when the air is humid, the withstand voltage test may not pass, so that the tester can make a misjudgment on the safety performance of the product.

Optionally, an insulating material (not shown) may be provided within the shield can 31, which in this embodiment may be present in a number of different ways. For example, if a gas such as sulfur hexafluoride is used as the insulating material, the insulating gas may be uniformly filled in the shield case 31, or when a solid or liquid insulating material is used, the solid or liquid insulating material may be wrapped around the hollow coil 32 or the like, or the solid or liquid insulating material may be attached to the inner wall of the shield case 31, 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 products thereof, glass, ceramic products, mica, asbestos and products thereof.

Preferably, the insulating material is added with a material that absorbs electromagnetic waves, such as graphite, ferrite, or the like. In this way, the medium within the shield case 31 that consumes electromagnetic waves can be increased, i.e., not only the electromagnetic waves are consumed by the consuming medium 34, but also some materials located in the insulating material can absorb a part of the electromagnetic waves.

For this, reference is further made to the following examples:

referring to fig. 5, fig. 5 is a schematic structural diagram of a magnetron filter assembly 50 according to another embodiment of the present invention, in which the magnetron filter assembly 50 includes a shielding box 51, an air-core coil 52, a feedthrough capacitor assembly 53, a consumption medium 54, and a cathode terminal 55, where the cathode terminal 55 is disposed at the bottom of the shielding box 51, and one end of the cathode terminal 55 is connected to a cathode (not shown) of a magnetron.

Wherein, the air-core coil 52 is arranged in the shielding box 51, and one end of the air-core coil 52 is connected with the other end of the cathode terminal 55; the feedthrough capacitor assembly 53 includes a lead wire 531 led out into the shield case 51, the lead wire 531 being connected to the other end of the air-core coil 52; the consumption medium 54 is sleeved on the cathode terminal 55 and is used for consuming the electromagnetic waves led out along the cathode terminal 55.

Optionally, the magnetron filter assembly 50 further includes an insulating gasket 56, and the insulating gasket 56 is disposed on an inner top wall, an inner bottom wall, and an inner side wall of the shield case 51, and is disposed to surround the air core coil 52 and the partial feedthrough capacitor assembly 53. Note that the insulating spacer 56 of the inner ceiling portion is not shown in fig. 5.

Specifically, the insulating pad 56 may include a first insulating pad 561 and a second insulating pad 562, as shown in fig. 6 and 7, where fig. 6 is a schematic structural diagram of the first insulating pad provided in the present application, and fig. 7 is a schematic structural diagram of the second insulating pad provided in the present application.

Referring to fig. 6, the first insulating pad 561 is disposed at the bottom of the shielding box 51, and has the same shape as the bottom of the shielding box 51, for example, a shape similar to a rectangle, so that the first insulating pad 561 is disposed at the bottom for bonding and fixing. In this embodiment, a through hole 56a may be further disposed on the first insulating pad 561, the position of the through hole 56a is the same as the position of the consuming medium 54, and the consuming medium 54 is disposed in the through hole 56a, such that the hole wall of the through hole 56a is attached to the outer wall of the consuming medium 54, so as to further fix the first insulating pad 561 to the bottom of the shielding box 51 by using the relationship between the through hole 56a and the consuming medium 54.

Further, referring to fig. 7, the second insulating pad 562 is disposed on the inner top wall and the inner side wall of the shielding box 51, the second insulating pad 562 specifically includes a top surface disposed on the inner top wall of the shielding box 51, and a first side surface a, a second side surface B, and a third side surface C sequentially connected to the inner side wall, wherein the first side surface a, the second side surface B, and the third side surface C are connected to the top surface, and a gap between the first side surface a and the third side surface C corresponds to a side wall through which the feedthrough capacitor assembly 53 penetrates, that is, is opposite to the second side surface B. Thus, the air-core coil 52 and the feedthrough capacitor assembly 53 are surrounded from four directions in a cover shape composed of three side surfaces and one top surface, wherein the second side surface B opposite to the notch side surface can be set in an arc shape according to the shape of the shield case 51.

Alternatively, by spacing a preset distance between the first insulating pad 561 and the inner side wall of the shielding box 51, the preset distance may be the thickness of one insulating pad 56, so that three sides of the second insulating pad 562 can utilize the space card of the preset distance and be arranged between the side wall of the shielding box 51 and the first insulating pad 561, so that the first insulating pad 561 and the second insulating pad 562 are fixed to each other, and by such a clamping fixing manner, a special fixing installation procedure is not required to be added, and the manufacturing process flow can be simplified.

The thickness of the insulating pad 56 can be determined according to the voltage-resistant insulating property of the selected material, and the material and the thickness need to satisfy: the product of the withstand voltage per mm of the insulating material and the thickness of the material is greater than 4kV, and the thickness of the insulating spacer 56 in this embodiment is typically 1-3 mm.

Optionally, the first insulating pad 561 and the second insulating pad 562 have a plurality of air holes 56b opened at suitable positions thereof to help the air-core coil 52 and the feedthrough capacitor assembly 53 dissipate heat; specifically, the air hole 56b may be opened on the side close to the feedthrough capacitor assembly 53, and the air hole is matched with the small holes formed in the inner walls of the shielding box 51, so that air convection is realized, and the whole device can be assisted in heat dissipation.

In the present embodiment, by providing the insulating spacer 56 in the shielding case 51, the distance between the air-core coil 52 and the inner wall of the shielding case 51 can be reduced while the air-core coil 52 is ensured not to generate a discharge spark phenomenon with the shielding case 51, thereby reducing the volume of the shielding case 51 accordingly; and because of the existence of the consumed medium 54, the interference of the high-frequency electromagnetic wave led out from the cathode terminal 55 can be suppressed, so that the requirement of the high-frequency interference suppression of the original magnetron filter assembly 50 is reduced, and the air-core coil 52 has greater freedom of parameter selection, so that the number of turns of the coil can be properly reduced in the embodiment, even the air-core coil 52 is eliminated, the volume of the whole shielding box 51 can be further reduced on the basis of reducing the size of the shielding box 51 by using the insulating gasket 56, and the dimensions of the length, the width and the height of the shielding box 51 are reduced, and the volume reduction ratio can reach more than 50%.

Referring to fig. 8, fig. 8 is a schematic structural diagram of an embodiment of a magnetron provided by the present application. The magnetron 80 includes a magnetron body 81 and a magnetron filter assembly 82. Wherein, the magnetron filtering component 82 is disposed on the magnetron main body 81 for consuming the electromagnetic wave transmitted from the magnetron main body 81, and the magnetron filtering component 82 is as provided in any of the above embodiments. The magnetron filtering component 82 is used for restraining and consuming high-frequency electromagnetic waves generated by the magnetron through an LCL resonant circuit formed by the through capacitor component and a consumption medium sleeved on the cathode terminal, so that filtering can be realized without arranging a coil in the magnetron filtering component 82, and when the volume of a shielding box is set, the problem that the distance between the coil and the shielding box needs to be ensured because the phenomenon of discharging and igniting can occur to the coil and the shielding box is not needed to be considered, and further the volume of the shielding box can be reduced, and finally the volume of the magnetron is reduced.

Referring to fig. 9, fig. 9 is a schematic structural diagram of an embodiment of a household appliance provided in the present application. The household appliance 90 comprises a magnetron 91. In the magnetron 91 according to the above embodiment, since the magnetron filtering assembly according to any of the above embodiments is present in the magnetron according to the above embodiments, the volume of the household appliance 90 is reduced due to the reduction of the volume of the magnetron filtering assembly.

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

Claims

1. A magnetron filter assembly, comprising:

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

the feedthrough capacitor assembly penetrates through the side wall of the shielding box and comprises a lead-out wire led out into the shielding box, and the lead-out wire is connected with the cathode wiring terminal;

the consumption medium is sleeved on the cathode terminal, is used for supporting the cathode terminal and is also used for consuming electromagnetic waves led out along the cathode terminal; wherein the consuming medium is an insulating material.

2. The magnetron filtering assembly of claim 1,

the magnetron filtering assembly further comprises:

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

3. The magnetron filtering assembly of claim 2,

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.

4. The magnetron filtering assembly of claim 3,

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.

5. The magnetron filtering assembly of claim 4,

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.

6. The magnetron filtering assembly of claim 2,

the magnetron filtering assembly further includes insulating spacers disposed on an inner top wall, an inner bottom wall, and an inner sidewall of the shield case.

7. The magnetron filter assembly of claim 6, wherein the insulating liner has a thickness of 1-3 mm.

8. The magnetron filtering assembly of claim 1,

the consumption medium is ferrite material.

9. A magnetron, comprising:

a magnetron main body;

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

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