CN112786410B - Magnetron filter assembly, magnetron and household appliance - Google Patents

Abstract

The application relates to the technical field of magnetrons and discloses a magnetron filter assembly, a magnetron and a household appliance. The magnetron filter assembly comprises a shielding box and a feedthrough capacitor assembly; wherein, the cathode terminal of the magnetron is arranged at the bottom of the shielding box in a penetrating way, and one end of the cathode terminal is connected with the cathode of the magnetron; the 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 a cathode line led out of the shielding box, one end of the outgoing line is connected with the other end of the cathode terminal, the other end of the outgoing line is connected with the cathode line, and the cathode line is used for being connected with an external power supply; wherein, the negative pole line is coil-shaped. By the above mode, the volume of the magnetron can be reduced.

Description

Magnetron filter assembly, magnetron and household appliance

Technical Field

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

Background

The magnetron is a vacuum electron tube for generating microwaves, and a common filtering device for the magnetron at present consists of a shielding box and a filtering component arranged in the shielding box, wherein the shielding box is a metal box with a shielding effect, and the filtering component consists of a capacitor and an inductor which are connected. The filtering device can effectively prevent clutter coming out of the terminal of the vacuum tube from propagating along a power supply line or radiating outside the shielding box.

Because of the working characteristics of the magnetron, the magnetron filter assembly is connected with negative high voltage during normal operation, and in order to prevent the ignition between the filter assembly and the shielding assembly, the relative distance between the filter assembly and the shielding assembly needs to be ensured during design. With the continuous upgrading of magnetrons and the miniaturization demands of household microwave ovens, the sizes of magnetrons are gradually developed towards miniaturization, so that the optimization of the sizes of shielding assemblies is also of great importance.

Disclosure of Invention

The technical problem that this application mainly solves is to provide magnetron filter assembly, magnetron and domestic appliance, can reduce the volume of magnetron.

The application adopts a technical scheme that provides a magnetron filter assembly, this magnetron filter assembly includes: 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 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 a cathode line led out of the shielding box, one end of the outgoing line is connected with a cathode terminal, the other end of the outgoing line is connected with the cathode line, and the cathode line is used for being connected with an external power supply; wherein, the negative pole line is coil-shaped.

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

The cathode wire comprises a first cathode wire and a second cathode wire, one end of the first cathode wire is connected with the other end of the first outgoing wire, and one end of the second cathode wire is connected with the other end of the second cathode terminal; wherein, first negative pole line and second negative pole line twisted pair are coil form setting.

The cathode line further comprises a third cathode line, and the third cathode line is grounded; wherein, first negative pole line, second negative pole line and third negative pole line are three hank, are coil form setting.

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

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

Wherein, be provided with the magnetic core on the negative pole line, the magnetic core wears to locate the accommodation space that is the negative pole line that the coil form set up.

The magnetron filter assembly also comprises a choke coil, wherein one end of the choke coil is connected with the other end of the cathode terminal; one end of the outgoing line is connected with the other end of the choke coil, and the other end of the outgoing line is connected with the cathode line.

Another technical solution adopted in the present application is to provide a magnetron, which includes: 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 provided by the technical scheme.

Another technical solution adopted by the present application is to provide a household appliance, which includes a magnetron, and the magnetron is provided by the technical solution described above.

The beneficial effects of this application are: in contrast to the prior art, a magnetron filter assembly of the present application comprises: the magnetron filter assembly includes: 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 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 a cathode line led out of the shielding box, one end of the outgoing line is connected with a cathode terminal, the other end of the outgoing line is connected with the cathode line, and the cathode line is used for being connected with an external power supply; wherein, the negative pole line is coil-shaped. Through the mode, the magnetron filter assembly is in the coil shape through the cathode wire, so that the LC resonant circuit formed by the feedthrough capacitor assembly and the coil-shaped cathode wire can inhibit and consume high-frequency electromagnetic waves generated by the magnetron, the choke coil is not required to be arranged in the shielding box, filtering can be realized, the material cost for manufacturing the choke coil can be saved, and on the other hand, when the size of the shielding box is set, the problem that the distance between the choke coil and the shielding box is required to be ensured because the phenomenon that the choke coil and the shielding box are subjected to discharging and igniting is not required to be considered is solved, and 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 of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that 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 view of an embodiment of a magnetron filter assembly provided herein;

FIG. 2 is a schematic view of another embodiment of a magnetron filter assembly provided herein;

FIG. 3 is a schematic view of another embodiment of a magnetron filter assembly provided herein;

FIG. 4 is a schematic view of another embodiment of a magnetron filter assembly provided herein;

FIG. 5 is a schematic view of another embodiment of a magnetron filter assembly provided herein;

FIG. 6 is a schematic view of another embodiment of a magnetron filter assembly provided herein;

FIG. 7 is a schematic view of another embodiment of a magnetron filter assembly provided herein;

FIG. 8 is a schematic view of another embodiment of a magnetron filter assembly provided herein;

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

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

fig. 11 is a schematic structural view of an embodiment of the home appliance provided in 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 for purposes of illustration only and are not limiting. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present application are shown in the drawings. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

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 present 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 appreciate that the embodiments described herein may be combined with other embodiments.

In the technical field of magnetrons, electromagnetic waves generated by an emission cavity of the magnetrons mainly comprise needed fundamental waves (2450 MHz), and electromagnetic waves with other frequencies (including second high-frequency harmonic waves (4900 MHz), third high-frequency harmonic waves (7350 MHz), fourth high-frequency harmonic waves (9.8 GHz), fifth high-frequency harmonic waves (12.5 GHz) and the like), wherein one part of the electromagnetic waves enter a designated working area, such as a cooking chamber of a microwave oven, through an antenna, and the other part of the electromagnetic waves leak outwards along the directions of a central lead and side leads entering the emission cavity, and electromagnetic wave interference is generated on surrounding devices to become harassment waves. In order to reduce outward leakage of the harassment waves along the directions of the center lead and the side lead, in the related art, the center lead and the side lead penetrate through a shielding cavity and then enter a transmitting cavity, the shielding cavity adopts a choke coil and a penetration capacitor to form a resonance system, and harassment waves introduced from the transmitting cavity can be partially eliminated by utilizing a shielding shell of the shielding cavity.

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

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

In some applications of household appliances (such as microwave ovens), the space occupation of the inner cavity of the household appliance is small due to the oversized magnetron, and the oversized shielding box is an important reason that the size of the magnetron is difficult to shrink. Based on this, the following embodiments are presented:

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

Inside the shielding case 21 is a receiving cavity for receiving a portion of the feedthrough capacitor assembly 22.

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

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

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

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

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

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

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

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

By the above manner, the cathode line 222 is arranged in a coil shape without increasing the cost, so that the impedance of the common mode loop is increased, and the common mode radiation is reduced, thereby reducing the element parameters of the magnetron filter assembly 20 and reducing the cost and technical requirements of the magnetron filter assembly 20.

Specifically, in comparison with fig. 1 and 2, the choke coil is omitted from fig. 2. When the sidewalls are provided, the distance between the first and third sidewalls 211 and 213 is reduced, i.e., the distance N between the first and third sidewalls 211 and 213 in fig. 2 is smaller than the distance L between the first and third sidewalls 111 and 113 in fig. 1; the distance between the second sidewall 212 and the fourth sidewall 214 decreases, i.e., the distance O between the second sidewall 212 and the fourth sidewall 214 in fig. 2 is less than the distance M between the second sidewall 112 and the fourth sidewall 114 in fig. 1. In this way, the first cathode line 2221 and the second cathode line 2222 are twisted in a coil shape without increasing the cost, which can suppress electromagnetic waves, further save the material cost for manufacturing choke coils, and reduce the volume of the shielding case 21.

In this embodiment, the magnetron filter assembly 20 is configured such that the cathode wire 222 is configured in a coil shape, so that the feedthrough capacitor assembly 22 and the coil-shaped cathode wire 222 form an LC resonant circuit, which suppresses and consumes high-frequency electromagnetic waves generated by the magnetron, so that on one hand, under the condition that the cathode wire 222 can suppress electromagnetic waves, the choke coil is not required to be disposed inside the shielding case, and on the other hand, the material cost for manufacturing the choke coil can be saved, and on the other hand, when the volume of the shielding case 21 is disposed, the problem that the distance between the choke coil and the shielding case 21 must be ensured without considering the phenomenon that the choke coil and the shielding case 21 will generate discharge and strike is solved, and thus the volume of the shielding case 21 can be reduced, and finally the volume of the magnetron is reduced.

Referring to fig. 3, fig. 3 is a schematic structural diagram of another embodiment of a magnetron filter assembly provided in the present application. The magnetron filter assembly 30 includes a shield box 31, a feedthrough capacitor assembly 32, and a sacrificial medium 33.

Inside the shielding box 31 is a receiving cavity for receiving a portion of the feedthrough capacitor assembly 32 and the consumable medium 33.

The magnetron filter assembly 30 is disposed on a magnetron main body, the magnetron main body includes a cathode terminal 34 and a cathode, the cathode terminal 34 is led out from the magnetron main body and penetrates through the bottom of the shielding box 31, and one end of the cathode terminal 34 is connected with the cathode. The cathode terminal 34 is disposed in the receiving cavity of the shield case 31 at the other end after penetrating the bottom of the shield case 31.

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

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

Specifically, the consumption medium 33 is provided with a first through hole and a second through hole, the first outgoing line 3211 is provided through the first through hole, and the second outgoing line 3213 is provided through the second through hole. At this time, the first and second outgoing lines 3211 and 3212 form an inductance with the consumption medium 33, and the inductance has characteristics of both differential mode inductance and common mode inductance, so that electromagnetic waves along the outgoing lines 321 can be consumed when the magnetron filter assembly 30 is operated.

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

In this way, the whole magnetron filter assembly 30 suppresses and consumes the high-frequency electromagnetic wave generated by the magnetron by using the LCL resonant circuit formed by the winding-shaped arrangement of the consumption medium 33, the feedthrough capacitor assembly 32 and the cathode wire 322 sleeved on the lead-out wire 321, so that the filter can be realized without arranging the choke coil inside the shielding box, and the distance between the choke coil and the shielding box 31 is ensured without considering the discharge ignition phenomenon of the choke coil and the shielding box 31 when the volume of the shielding box 31 is arranged, thereby reducing the volume of the shielding box 31 and finally reducing the volume of the magnetron.

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

In other embodiments, the consumption medium 33 may be made of various materials with high insulation, high magnetic permeability, and large magnetic loss. The consumable medium 33 may have a ring shape or a cylindrical shape, and the shape of the consumable medium 33 may be adjusted in length and width accordingly.

In the case that certain filtering conditions are satisfied, the space occupied by the consumption medium 33 and the feedthrough capacitor assembly 32 in the magnetron filter assembly 30 provided in the present embodiment in the shielding box 31 can be set as small as possible, so that the volume of the shielding box 31 can be reduced correspondingly. For example, in order to reduce the volume of the shield case 31, the consumption medium 33 having a large capacity to absorb electromagnetic wave may be selected. Accordingly, since the cathode wire 322 is disposed outside the shield case 31, the cathode wire 322 may be selectively disposed as a coil having a large capability of absorbing electromagnetic waves to consume more electromagnetic waves, so that the burden of the consumption medium 33 can be reduced, the volume of the consumption medium 33 can be reduced, and thus the volume of the shield case 31 can be reduced accordingly.

The feedthrough capacitor assembly 32 is described as follows:

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

In some embodiments, in order to further reduce the volume of the shielding box 31, the outer portion of the consumption medium 33 is attached to the inner housing 323, the first outgoing line 3211 and the second outgoing line 3212 are attached to the inner sides of the first through hole and the second through hole of the consumption medium 33, and when the volume of the outgoing line 321 is fixed, the consumption medium 33 is attached to the outgoing line 321, so that the volume of the consumption medium 33, and thus the volume of the inner housing 323, can be controlled to the greatest extent, thereby reducing the volume of the shielding box 31.

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

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

In this embodiment, the magnetron filter assembly 30 suppresses and consumes the high-frequency electromagnetic wave generated by the magnetron by using the LCL resonant circuit formed by the coil-shaped arrangement of the consumption medium 33, the feedthrough capacitor assembly 32 and the cathode wire 322 sleeved on the lead-out wire, so that the filtering can be realized without arranging the choke coil inside the shielding box, and the distance between the choke coil and the shielding box 31 is ensured without considering the discharge ignition phenomenon of the choke coil and the shielding box 31 when the volume of the shielding box 31 is arranged, thereby reducing the volume of the shielding box 31 and finally reducing the volume of the magnetron. And by eliminating the choke coil and reducing the volume of the shield case 31, the materials for manufacturing the choke coil and the shield case 31 can be saved correspondingly, and the production cost of the magnetron filter assembly 30 can be reduced.

Referring to fig. 4, fig. 4 is a schematic structural diagram of another embodiment of a magnetron filter assembly provided in the present application, where the magnetron filter assembly 40 provided in the present application includes a shielding case 41, a feedthrough capacitor assembly 42, and a dissipation media 43.

Inside the shielding box 41 is a receiving cavity for receiving a portion of the feedthrough capacitor assembly 42 and the consumable medium 43.

The magnetron filter assembly 40 is disposed on a magnetron main body, the magnetron main body includes a cathode terminal 44 and a cathode, the cathode terminal 44 is led out from the magnetron main body and penetrates through the bottom of the shielding box 41, and one end of the cathode terminal 44 is connected with the cathode. After penetrating the bottom of the shielding case 41, the cathode terminal 44 is disposed at the other end in the receiving chamber of the shielding case 41.

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

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

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

Specifically, the lead lines 421 include a first lead line 4211 and a second lead line 4212, one end of the first lead line 4211 is connected to the first cathode terminal 441, and one end of the second lead line 4212 is connected to the second cathode terminal 442. Since the lead-out wire 421 is directly connected with the cathode terminal 44, the choke coil which is originally connected with the cathode terminal 44 and the lead-out wire 421 is abandoned, and the space occupied by the choke coil in the shielding case 41 is released, so that the problem that the distance between the choke coil and the shielding case 41 needs to be ensured because the phenomenon that the choke coil and the shielding case 41 generate discharge ignition is not considered when the volume of the shielding case 41 is arranged is solved, and the volume of the shielding case 41 can be reduced.

The cathode line 422 includes a first cathode line 4221 and a second cathode line 4222, one end of the first cathode line 4221 is connected to the other end of the first lead line 4211, and one end of the second cathode line 4222 is connected to the other end of the second lead line 4212; the first cathode line 4221 and the second cathode line 4222 are twisted in a coil shape, and electromagnetic waves along the cathode line 422 can be suppressed without increasing the cost. In particular, the twist cycle of the twisted pairs of the first cathode line 4221 and the second cathode line 4222 should be as dense as possible to improve the ability to suppress the interference of the differential mode radiation.

In this way, the whole magnetron filter assembly 40 suppresses and consumes the high-frequency electromagnetic wave generated by the magnetron by using the LCL resonant circuit formed by the consumption medium 43 sleeved on the cathode terminal 44, the feedthrough capacitor assembly 42 and the cathode wire 422 in a coil shape, so that the filtering can be realized without arranging the choke coil inside the shielding box 41, and the problem that the distance between the choke coil and the shielding box 41 must be ensured without considering the discharge ignition phenomenon of the choke coil and the shielding box 41 when the volume of the shielding box 41 is arranged is solved, thereby reducing the volume of the shielding box 41 and finally reducing the volume of the magnetron.

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

In a practical scenario, when the magnetron filter assembly 40 is energized, the cathode in the magnetron emits hot electrons at a temperature of about 2000K, the hot electrons rotate in the working space thereof to generate an electric field of about 2440MHZ, so that the hot electrons become harmonic waves under the action of the electric field and the magnetic field in the working space and the harmonic waves are emitted to the outside through the antenna, and the high-frequency harmonic waves generated in the working space not only have basic waves for cooking but also have integral multiples of the basic wave frequency, but also generally radiate to the external space through the consuming medium 43 through the cathode terminal 44 connected with the cathode, and after the material (for example, ceramic) originally sleeved on the cathode terminal 44 is replaced by the consuming medium 43, the consuming medium 43 is equivalent to a cathode insulation support column, namely, a low-pass filter is equivalent to adding to the cathode terminal 44, and meanwhile, the ferrite material can play a role of shielding consumption, reduce the consumption of the high-frequency electromagnetic wave interference from the consuming medium 43 to the space, and achieve the filtering effect of stabilizing the filtering component of the radiation from the space.

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

Inside the shield box 51 is a housing cavity for housing part of the feedthrough capacitor assembly 52, the consumable medium 53 and the insulating support posts 54 of the magnetron.

The magnetron filter assembly 50 is disposed on a magnetron main body, the magnetron main body includes a cathode terminal 55, a cathode and an insulating support column 54, the cathode terminal 55 is led out from the magnetron main body and penetrates through the bottom of the shielding box 51, and one end of the cathode terminal 55 is connected with the cathode. After penetrating the bottom of the shield case 51, the cathode terminal 55 is disposed at the other end in the receiving chamber of the shield case 51. Specifically, the cathode terminal 55 is provided through the insulating support column 54.

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

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

At this time, the first cathode terminal 551, the second cathode terminal 552 and the consumption medium 53 form an inductance, and electromagnetic waves along the cathode terminal 55 may be consumed when the magnetron filter assembly 50 is operated.

Specifically, the lead 521 includes a first lead 5211 and a second lead 5212, one end of the first lead 5211 being connected to the first cathode terminal 551 and one end of the second lead 5212 being connected to the second cathode terminal 552. Since the lead wire 521 is directly connected to the cathode terminal 55, the choke coil which is originally connected to the cathode terminal 55 and the lead wire 521 is omitted, and the space occupied by the choke coil in the shield case 51 is released, so that the problem that the distance between the choke coil and the shield case 51 needs to be ensured because the phenomenon that the choke coil and the shield case 51 generate discharge ignition is not considered when the volume of the shield case 51 is set, and the volume of the shield case 51 can be reduced.

The cathode line 522 is provided in a coil shape and is used for being connected to a power source for consuming electromagnetic waves along the cathode line 522. Specifically, the cathode line 522 includes a first cathode line 5221 and a second cathode line 5222, one end of the first cathode line 5221 is connected to the other end of the first outgoing line 5211 and one end of the second cathode line 5222 is connected to the other end of the second outgoing line 5212. The first cathode line 5221 and the second cathode line 5222 are twisted pair and are provided in a coil shape.

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

In this way, the whole magnetron filter assembly 50 suppresses and consumes the high-frequency electromagnetic wave generated by the magnetron by using the consumption medium 53 sleeved on the insulating support column 54 of the magnetron, the feedthrough capacitor assembly 52, the first cathode line 5221 and the second cathode line 5222, and the LCL resonant circuit formed by the coil shape, so that the choke coil is not required to be arranged inside the shielding box 51, and filtering can be realized, so that the problem that the distance between the choke coil and the shielding box 51 needs to be ensured because of the discharge ignition phenomenon of the choke coil and the shielding box 51 is not required to be considered when the volume of the shielding box 51 is arranged, and the volume of the shielding box 51 can be reduced, and finally the volume of the magnetron is reduced.

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

Inside the shield case 61 is an accommodating chamber for accommodating the choke coil 62 and a part of the feedthrough capacitor assembly 63.

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

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

The feedthrough capacitor assembly 63 is disposed on a sidewall of the shielding case 61 in a penetrating manner, the feedthrough capacitor assembly 63 includes an outgoing line 631 led out of the shielding case 61 and a cathode line 632 led out of the shielding case 61, one end of the outgoing line 631 is connected to the other end of the choke coil 62, the other end of the outgoing line 631 is connected to the cathode line 632, and the cathode line 632 is used for connecting an external power supply; the cathode line 632 is provided in a coil shape, and electromagnetic waves along the cathode line 632 can be suppressed without increasing the cost. In some embodiments, a magnetic core is disposed on the cathode line 632 disposed in a coil shape, and the magnetic core penetrates through the accommodating space of the cathode line 632 disposed in a coil shape. It will be appreciated that the cathode wire 632 is an air core coil when it is arranged in a coil shape, and a magnetic core coil is arranged after the magnetic core. The core coil may be any of a ferrite coil, an iron core coil, or a copper core coil.

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

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

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

The cathode line 632 includes a first cathode line 6321 and a second cathode line 6322, one end of the first cathode line 6321 is connected to the other end of the first outgoing line 6311, and one end of the second cathode line 6322 is connected to the other end of the second outgoing line 6312; the first cathode line 6321 and the second cathode line 6322 are twisted in a coil shape, and electromagnetic waves along the cathode line 632 can be suppressed without increasing the cost. In particular, the twisting period of the twisted pairs of the first cathode line 6321 and the second cathode line 6322 should be as close as possible to improve the ability to suppress the interference of the differential mode radiation.

In other embodiments, the first cathode line 6321 and the second cathode line 6322 are respectively provided in a coil shape.

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

In the related art, the first cathode line and the second cathode line are longer and have larger spacing, so the differential mode current loop area is large, resulting in stronger differential mode radiation, while the differential mode current loop area is close to zero after the first cathode line 6321 and the second cathode line 6322 are twisted in pairs, so the differential mode electromagnetic radiation is significantly reduced. Wherein a differential mode noise current from inside the magnetron with opposite current direction is present on the cathode line 632. At this time, the area surrounded by the first cathode line 6321 and the second cathode line 6322 is large, and the differential mode current on the cathode line 632 will radiate strong electromagnetic interference into the air, which is called differential mode radiation of the magnetron.

Further, the first cathode line 6321 and the second cathode line 6322 are twisted in a coil shape to form an air core inductor, and form a T-type filter together with the choke coil 62 and the feedthrough capacitor assembly 63, so as to suppress the common mode noise current, thereby reducing the common mode electromagnetic radiation. In the circuit composed of the magnetron, the magnetron filter unit 60 and the power supply, common mode noise current having the same current direction from the inside of the magnetron exists on the cathode line. At this time, the loop formed by the first cathode lines 6321 and the second cathode lines 6322 and the ground line radiates strong electromagnetic interference into the air, which is called common mode radiation of the magnetron. By the above manner, the cathode line 632 is arranged in a coil shape without increasing the cost, so that the impedance of the common mode loop is increased, and the common mode radiation is reduced, thereby reducing the element parameters of the magnetron filter assembly 60 and reducing the cost and technical requirements of the magnetron filter assembly 60.

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

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

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

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

Alternatively, the cavity of the shield case 71 may be divided into a first cavity a and a second cavity B based on the penetration position of the cathode terminal 74 in the shield case 71 as a plane Z parallel to the first side wall 711. The first cavity a is disposed close to the feedthrough capacitor assembly 73, the second cavity B is disposed far from the feedthrough capacitor assembly 73, and the choke coil 72 is disposed in the first cavity a. The volume of the first cavity a is larger than the volume of the second cavity B. Compared with the related art, the choke coil 72 of the present embodiment can consume electromagnetic waves because the cathode lines 732 are arranged in a coil shape, the number of turns of the choke coil 72 can be smaller than that of the choke coil 72 of the related art, the projection length of the choke coil 72 in the shielding case 71 is reduced, and the space between the third side wall 713 and the first side wall 711 can be reduced when the side walls are arranged, thereby reducing the volume of the shielding case 71.

Specifically, in comparison with fig. 1 and 7, the number of turns of the choke coil 72 in fig. 7 is 4, and the number of turns of the choke coil 12 in fig. 1 is 5, the number of turns of the choke coil 72 in fig. 7 is reduced. Accordingly, when the sidewalls are disposed, the distance between the first and third sidewalls 711 and 713 is reduced, i.e., the distance V between the first and third sidewalls 711 and 713 in fig. 7 is smaller than the distance L between the first and third sidewalls 111 and 113 in fig. 1. In this way, the cathode wires 732 are twisted in pairs and are provided in a coil shape without increasing the cost, so that electromagnetic waves can be suppressed, the number of turns of the choke coil 72 can be reduced, and the material cost of the choke coil 72 can be reduced. In some embodiments, since the cathode line 732 is disposed in a coil shape, a portion of the electromagnetic wave is consumed, the coil diameter of the choke coil 72 may be reduced, so that the space occupied by the choke coil 72 in the shielding case 71 is reduced, and accordingly, when the side walls are disposed, the distance between the second side wall 712 and the fourth side wall 714 is reduced, that is, the distance W between the second side wall 712 and the fourth side wall 714 in fig. 7 is smaller than the distance M between the second side wall 112 and the fourth side wall 114 in fig. 1.

In a specific embodiment, for the division of the cavity in the shielding box 71, the shielding box 71 may be divided into two cavities, for example, two cavities in a cuboid shape, by using a penetrating position of the cathode terminal 74 in the shielding box 71 and a plane parallel to the first sidewall 711 of the penetrating capacitor assembly 73 penetrating the shielding box 71.

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

Therefore, by arranging the cathode line 732 in a coil shape, electromagnetic waves along the cathode line 732 can be consumed, and thus the choke coil 72 can be arranged in the shield case 71 with a reduced number of turns, as compared with the related art. Further, since the number of turns of the choke coil 72 is reduced, the space occupied by the choke coil 72 in the shield case 71 is reduced, and further, the distance between the side wall of the shield case 71 and the choke coil 72 is increased and is larger than the safety distance, and the distance between the side wall and the choke coil 72 can be kept at the safety distance by adjusting the side wall, and at this time, the volume of the shield case 71 is reduced.

It should be noted that, the space occupation ratio of the choke coil 72 and the feedthrough capacitor assembly 73 may be determined by those skilled in the art or a manufacturer according to actual circumstances, and will not be described here.

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

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

Further, the choke coil 72 can be set to be an air core coil based on the conventional magnetron structure, and the distance between turns of the coil is the same due to the fact that only the air core section is reserved, so that the processing technology can be simpler and the consistency is better.

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

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

In other embodiments, as shown in fig. 8, the dissipation medium 75 may be disposed on the outgoing line 731 of the feedthrough capacitor assembly 73, where the dissipation medium 75 can absorb electromagnetic waves propagating from the cathode terminal 74 into the shielding case 71, so that the dissipation medium 75 can reduce the number of turns of the choke coil 72 to some extent, thereby reducing the volume of the shielding case 71 and finally reducing the volume of the magnetron.

Specifically, referring to fig. 9, the consumption medium 75 is provided with a first through hole 751 and a second through hole 752, the first lead-out wire 7311 is provided to pass through the first through hole 751, and the second lead-out wire 7312 is provided to pass through the second through hole 752. At this time, the first and second lead lines 7311 and 7312 and the consumption medium 75 form an inductance having both the characteristics of differential mode inductance and common mode inductance, and electromagnetic waves along the lead line 731 can be consumed when the magnetron filter assembly 70 is operated.

Optionally, the consumable medium 75 is at least partially embedded in the inner housing 733, i.e. the consumable medium 75 is at least partially located in the first accommodating cavity, specifically, at least part of the outer wall of the consumable medium 75 is attached to at least part of the inner wall of the inner housing 733. At least a portion of the consumable medium 75 is secured within the first receiving cavity, for example, by an interference fit or welding. Therefore, in the present embodiment, by providing at least part of the consumption medium 75 in the first accommodating chamber of the inner housing 733, the feedthrough capacitor assembly 73 at least partially overlaps the consumption medium 75, the number of turns of the choke coil 72 can be further reduced without occupying the internal space of the shield case 71, and thus the space occupied by the choke coil 72 in the shield case 71 can be further reduced, and the volume of the shield case 71 can be further reduced.

Due to the operation characteristics of the magnetron itself, during normal operation, the magnetron filter assembly 70 is connected with a negative high voltage, so that in order to prevent the discharge ignition phenomenon between the choke coil 72 and the shielding box 71 in the magnetron filter assembly 70, a safe distance between the choke coil 72 and the feedthrough capacitor assembly 73 and the shielding box 71 needs to be ensured during design. In the prior art, air is used as an insulating medium to avoid the occurrence of the point discharge phenomenon, and the disadvantage is that the size of the shielding box 71 is inevitably oversized due to the use of the air as the insulating medium, so that the overall size of the magnetron is increased, and thus the size of household appliances such as a microwave oven is huge and the effective use area is small. In addition, because the structure uses air as a medium, when the air is wet, the voltage resistance test can not pass, so that a tester can misjudge the safety performance of the product.

Optionally, an insulating material (not shown) may be provided within the shield can 71, which may be present in a number of different ways in this embodiment. 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 71, or when a solid or liquid insulating material is used, the solid or liquid insulating material may be wrapped around the choke coil 72 or the like, or the solid or liquid insulating material may be attached to the inner wall of the shield case 71, and the liquid insulating material 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.

Referring to fig. 10, fig. 10 is a schematic structural view of an embodiment of a magnetron provided in the present application. The magnetron 100 includes a magnetron body 101 and a magnetron filter assembly 102. The magnetron filter assembly 102 is disposed on the magnetron main body 101 and is used for consuming electromagnetic waves coming out of the magnetron main body 101, and the magnetron filter assembly 102 is provided in any of the above embodiments. According to the magnetron filter assembly, the cathode wire is arranged in the coil shape, so that the choke coil, the penetrating capacitor assembly and the LCL resonant circuit formed by the coil-shaped cathode wire inhibit and consume high-frequency electromagnetic waves generated by the magnetron, on one hand, the number of turns of the choke coil in the shielding box can be reduced under the condition that the cathode wire can inhibit the electromagnetic 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. 11, fig. 11 is a schematic structural view of an embodiment of a home appliance provided in the present application. The home appliance 110 includes a magnetron 111. Among them, the magnetron 111 is provided as the above embodiment, and since the magnetron filter assembly provided as any of the above embodiments is present in the magnetron of the above embodiment, the volume of the home appliance 110 may be reduced due to the reduced volume of the magnetron filter assembly.

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

The foregoing description is only of embodiments of the present application, and is not intended to limit the scope of the patent application, and all equivalent structures or equivalent processes using the descriptions and the contents of the present application or other related technical fields are included in the scope of the patent application.

Claims (5)

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

the shielding box is penetrated by a cathode terminal of the magnetron and arranged at the bottom of the shielding box, 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 a cathode of the magnetron;

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 a cathode line led out of the shielding box, wherein the outgoing line comprises a first outgoing line and a second outgoing line, one end of the first outgoing line is connected with the first cathode terminal, and one end of the second outgoing line is connected with the second cathode terminal;

The cathode wire comprises a first cathode wire, a second cathode wire and a third cathode wire, one end of the first cathode wire is connected with the other end of the first outgoing wire, one end of the second cathode wire is connected with the other end of the second outgoing wire, the third cathode wire is grounded, and the cathode wire is used for being connected with an external power supply;

wherein the first, second and third cathode lines are twisted three times and are arranged in a coil shape;

the consumption medium is provided with a first through hole and a second through hole, the first outgoing line penetrates through the first through hole, and the second outgoing line penetrates through the second through hole and is used for consuming electromagnetic waves along the outgoing line;

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;

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

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

The consumption medium is at least partially embedded in the inner shell.

2. The magnetron filter assembly of claim 1 wherein,

the cathode wire is provided with a magnetic core, and the magnetic core penetrates through the accommodating space of the cathode wire which is arranged in a coil shape.

3. The magnetron filter assembly of claim 1 wherein,

the magnetron filter assembly also comprises a choke coil, wherein one end of the choke coil is connected with the other end of the cathode terminal;

one end of the outgoing line is connected with the other end of the choke coil, and the other end of the outgoing line is connected with the cathode line.

4. 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 3.

5. A household appliance comprising a magnetron as claimed in claim 4.

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