Magnetron and cooking utensil

Abstract

The magnetron comprises a tube core, a shielding box, a feed-through capacitor and a filtering assembly, the tube core is provided with a cathode leading-out end, the shielding box is connected to the tube core, the cathode leading-out end is arranged in the shielding box, the feed-through capacitor is matched with the shielding box, a part of a body of the feed-through capacitor is located in the shielding box, and the filtering assembly is arranged on the tube core. The filtering assembly comprises a first coil, a second coil and a connecting wire, the first filtering coil is arranged in the shielding box, the feed-through capacitor is electrically connected with the cathode leading-out end through the first coil, the second coil is used for being arranged on a circuit board of the cooking utensil and electrically connected with a power supply structure of the circuit board, and the feed-through capacitor is electrically connected with the first coil through the connecting wire. The first coil is arranged in the shielding box, and the second coil is arranged on the circuit board of the cooking utensil, so that the space occupied by the filtering assembly in the shielding box is reduced, the requirements for shielding and the distance between the filtering assembly are met, the size of the shielding box is reduced, and the overall size of the magnetron is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and in particular to a magnetron and a cooking utensil. Background Art

[0002] This section merely provides background information related to the present disclosure and is not necessarily prior art.

[0003] A cooking appliance (a microwave oven or a microwave oven-steamer / oven, etc.) usually includes a body and a magnetron. The magnetron is installed in the body. The magnetron generates microwaves and feeds the microwaves into a cooking cavity of the body to heat and cook the food to be cooked in the cooking cavity using the microwaves.

[0004] Magnetron is a vacuum electron tube that generates microwaves. At present, common filter devices used for magnetron are composed of a shielding box and a filter component installed in the shielding box. The shielding box is a metal box that plays a shielding role, and the filter component is composed of a capacitor and an inductor. The filter device can effectively prevent the clutter from the terminal of the vacuum tube from propagating along the power supply line or radiating outside the shielding box.

[0005] However, due to the working characteristics of the magnetron itself, during normal operation, the filter assembly of the magnetron is connected to a negative high voltage. To prevent sparks 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. Therefore, the volume of the shielding box is relatively large, thereby reducing the space utilization rate of the cooking appliance. Summary of the invention

[0006] The purpose of the present invention is to at least solve the problem that the volume of the shielding box of the magnetron is relatively large. This purpose is achieved by the following technical solutions:

[0007] A first aspect of the present invention provides a magnetron for a cooking appliance, the magnetron comprising:

[0008] A tube core having a cathode lead terminal;

[0009] A shielding box, the shielding box is connected to the tube core, and the cathode lead-out terminal is arranged in the shielding box;

[0010] A through-hole capacitor, wherein the through-hole capacitor cooperates with the shielding box, and a part of the body of the through-hole capacitor is located inside the shielding box;

[0011] A filter component, the filter component comprising a first coil, a second coil and a connecting wire, the first coil being arranged in the shielding box, the through-hole capacitor being electrically connected to the cathode lead-out terminal through the first coil, the second coil being arranged outside the shielding box and being used to be arranged on a circuit board of the cooking utensil, the second coil being electrically connected to a power supply structure of the circuit board, and the through-hole capacitor being electrically connected to the first coil through the connecting wire.

[0012] According to the magnetron of the present invention, when the magnetron is used in a cooking appliance, the second coil is arranged on a circuit board of the magnetron, and the power supply structure of the circuit board is electrically connected to the lead-out end of the cathode assembly through the second coil, a connecting wire, a through-hole capacitor, and the first coil. The first coil and the second coil are used to filter out noise during use to ensure the EMC (Electro Magnetic Compatibility) performance of the magnetron.

[0013] By arranging the first coil in a shielding box and the second coil on a circuit board of a cooking utensil, the space occupied by the filter assembly in the shielding box can be reduced. On the premise of meeting the shielding and distance requirements from the filter assembly, the volume of the shielding box can be effectively reduced, thereby reducing the overall volume of the magnetron. When the magnetron is used in a cooking utensil, the space utilization rate of the cooking utensil can be effectively improved.

[0014] In addition, the magnetron according to the present invention may also have the following additional technical features:

[0015] In some embodiments of the present invention, the connecting wire is a shielded power wire.

[0016] In some embodiments of the present invention, the cathode lead-out terminal includes a first lead-out terminal and a second lead-out terminal, the through-hole capacitor includes a first connection terminal and a second connection terminal, the number of the first coils is two, the first connection terminal is connected to the first lead-out terminal through one of the first coils, and the second connection terminal is connected to the second lead-out terminal through another of the first coils.

[0017] In some embodiments of the present invention, the first coil includes a first spiral coil, one end of the first spiral coil is electrically connected to the cathode lead-out terminal, and the other end of the first spiral coil is electrically connected to the through-hole capacitor.

[0018] In some embodiments of the present invention, the first spiral coil comprises:

[0019] a first closely wound section, one end of which is electrically connected to the through-hole capacitor;

[0020] a first sparsely wound section, one end of the first sparsely wound section being connected to the other end of the first densely wound section;

[0021] A second closely wound section, one end of which is electrically connected to the cathode lead-out terminal, and the other end of which is connected to the other end of the first sparsely wound section.

[0022] In some embodiments of the present invention, the first coil further includes a first magnetic core, and the first magnetic core is at least disposed in one of the first densely wound section, the first sparsely wound section, and the second densely wound section.

[0023] In some embodiments of the present invention, the second coil includes a second spiral body, one end of the second spiral body is used to be electrically connected to the power supply structure of the circuit board, and the other end of the second spiral body is electrically connected to the connecting line.

[0024] In some embodiments of the present invention, the second spiral coil comprises:

[0025] a third closely wound section, one end of which is used to be electrically connected to the power supply structure of the circuit board;

[0026] a second sparsely wound section, one end of the second sparsely wound section being connected to the other end of the third densely wound section;

[0027] A fourth closely wound segment, one end of which is electrically connected to the connecting line, and the other end of which is connected to the other end of the second sparsely wound segment.

[0028] In some embodiments of the present invention, the first coil further includes a second magnetic core, and the second magnetic core is at least disposed in one of the third densely wound section, the second sparsely wound section, and the fourth densely wound section.

[0029] A second aspect of the present invention provides a cooking appliance, the cooking appliance comprising

[0030] According to the magnetron as described above;

[0031] A circuit board is arranged outside the shielding box, and the second coil is electrically connected to a power supply structure of the circuit board.

[0032] According to the cooking utensil of the present invention, the second coil of the magnetron is arranged on the circuit board of the magnetron, and the power supply structure of the circuit board is electrically connected to the lead-out end of the cathode assembly through the second coil, the connecting wire, the through-hole capacitor, the first coil, and the first coil. The first coil and the second coil are used to filter out the noise during use to ensure the EMC (ElectroMagnetic Compatibility) performance of the magnetron.

[0033] By arranging the first coil in a shielding box and the second coil on a circuit board of a cooking utensil, the space occupied by the filter assembly in the shielding box can be reduced. On the premise of meeting the shielding and distance requirements from the filter assembly, the volume of the shielding box can be effectively reduced, thereby reducing the overall volume of the magnetron. When the magnetron is used in a cooking utensil, the space utilization rate of the cooking utensil can be effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference numerals are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0035] Figure 1 Schematically shows a partial structural diagram of a cooking appliance according to an embodiment of the present invention;

[0036] Figure 2 for Figure 1 A structural cross-sectional view of a magnetron of a cooking appliance shown in (showing a circuit board of the cooking appliance);

[0037] Figure 3 for Figure 2 A schematic structural diagram of the structure shown from another perspective (the cover of the shielding box is not shown);

[0038] Figure 4 for Figure 3 A schematic diagram of a partial structure of the structure shown in ;

[0039] Figure 5 Schematically shows a simplified structural diagram of a cooking appliance according to an embodiment of the present invention (partial structure is shown);

[0040] Figure 6 for Figure 4 A schematic structural diagram of a first coil of the structure shown in FIG.

[0041] Figure 7 for Figure 4 A schematic diagram of the structure of the second coil of the structure shown in FIG.

[0042] Figure 8 The vertical polarization EMI test results (30MHZ-1GHZ) of the existing filter components;

[0043] Fig. 9 The vertically polarized EMI test results (30MHZ-1GHZ) of the filter assembly of the present invention;

[0044] Fig.10The horizontal polarization EMI test results (30MHZ-1GHZ) of the existing filter components;

[0045] Fig.11 EMI test results (30MHZ-1GHZ) of the horizontal polarization of the filter assembly of the present invention.

[0046] The reference numerals are as follows:

[0047] 100. Cooking utensils;

[0048] 10. Body;

[0049] 11. Cooking chamber;

[0050] 20. Microwave generating assembly;

[0051] 210. Magnetron;

[0052] 21. Tube core;

[0053] 211, cathode assembly; 2111, cathode lead-out terminal; 2111a, first lead-out terminal; 2111b, second lead-out terminal; 212, anode assembly; 213, first magnetic member; 214, second magnetic member; 215, heat sink; 216, bracket;

[0054] 22. Shielding box;

[0055] 221, box cover; 222, box body;

[0056] 23. Filter components;

[0057] 231, first coil; 2311, first densely wound section; 2312, first sparsely wound section; 2313, second densely wound section; 2314, first magnetic core; 232, second coil; 2321, third densely wound section; 2322, second sparsely wound section; 2323, fourth densely wound section; 2324, second magnetic core; 233, connecting wire;

[0058] 24. Feedthrough capacitor;

[0059] 241, first connection end; 242, second connection end;

[0060] 220, waveguide;

[0061] 230. Stirring element. DETAILED DESCRIPTION

[0062] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0063] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0064] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0065] For ease of description, spatial relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, then the elements described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both upper and lower orientations. The device can be oriented otherwise (rotated 90 degrees or in other directions) and the spatial relative descriptors used in the text are interpreted accordingly.

[0066] like Figures 1 to 11 As shown, according to an embodiment of the present invention, a magnetron 210 for a cooking appliance 100 is provided. The magnetron 210 includes a tube core 21 , a shielding box 22 , a through-hole capacitor 24 and a filter component 23 .

[0067] Specifically, the tube core 21 with the cathode lead-out terminal 2111 is connected and fixed to the shielding box 22 , the cathode lead-out terminal 2111 is located inside the shielding cover, the through-hole capacitor 24 is installed on the shielding box 22 , and part of the body of the through-hole capacitor 24 is arranged inside the shielding box 22 .

[0068] like Figure 3 and Figure 4 As shown, the filter component 23 includes two coils and a connecting line 233, wherein the two coils are a first coil 231 and a second coil 232, the first coil 231 is located inside the shielding box 22, and the cathode lead-out terminal 2111 is electrically connected to the through-hole capacitor 24 through the first coil 231, the second coil 232 is arranged on the circuit board of the cooking appliance 100, and the power supply structure of the circuit board is electrically connected to the through-hole capacitor 24 through the second coil 232 and the connecting line 233.

[0069] When the magnetron 210 is used in the cooking utensil 100, the second coil 232 is arranged on the circuit board of the magnetron 210. The power supply structure of the circuit board is electrically connected to the lead-out end of the cathode assembly 211 through the second coil 232, the connecting wire 233, the through-hole capacitor 24, and the first coil 231. The first coil 231 and the second coil 232 are used to filter out noise during use to ensure the EMC (Electro Magnetic Compatibility) performance of the magnetron 210.

[0070] By disposing the first coil 231 in the shielding box 22 and the second coil 232 on the circuit board of the cooking utensil 100, the space occupied by the filter component 23 in the shielding box 22 can be reduced. On the premise of meeting the shielding and distance requirements from the filter component 23, the volume of the shielding box 22 can be effectively reduced, thereby reducing the overall volume of the magnetron 210. When the magnetron 210 is used in the cooking utensil 100, the space utilization rate of the cooking utensil 100 can be effectively improved.

[0071] It should be understood that, in the prior art, at least two coils are usually arranged in the shielding box 22, and all the coils are arranged inside the shielding box 22. In order to meet the distance requirement between the shielding box 22 and the coils, the volume of the shielding box 22 is relatively large. In the embodiment of the present invention, a first coil 231 is arranged inside the shielding box 22, and a second coil 232 is arranged on the circuit board. By reducing the number of coils in the shielding box 22, the shielding box 22 can reduce the volume while meeting the distance requirement with the coils. Compared with the prior art, the present invention can effectively reduce the volume of the shielding and the magnetron 210, so that the overall volume of the magnetron 210 is reduced. When the magnetron 210 is used in the cooking utensil 100, the space utilization rate of the cooking utensil 100 can be effectively improved.

[0072] The structure of the filter assembly 23 proposed by the present invention and the existing filter assembly 23 for EMI (Electro Magnetic Interference) testing is as follows: Figures 8 to 11 As shown, Figure 8 The vertical polarization EMI test results (30MHZ-1GHZ) of the existing filter assembly 23 are shown below. Fig. 9 The vertical polarization EMI test results (30MHZ-1GHZ) of the filter assembly 23 of the present invention are shown in FIG. Fig.10 The horizontal polarization EMI test results (30MHZ-1GHZ) of the existing filter assembly 23 are shown below. Fig.11 The horizontal polarization EMI test result (30MHZ-1GHZ) of the filter assembly 23 of the present invention is shown in FIG. 2. By comparison, it can be seen that the filtering performance of the filter assembly 23 provided by the present invention is significantly better than that of the prior art, and on this basis, the volume of the shielding box 22 can be effectively reduced.

[0073] like Figure 1 As shown, in an embodiment of the present invention, the tube core 21 includes a bracket 216 , a tube body, a cathode assembly 211 , an anode assembly 212 , a first magnetic member 213 , a second magnetic member 214 and a heat sink 215 .

[0074] The bracket 216 can be an integrated structure or a split structure. When the bracket 216 is an integrated structure, it can be integrated by stamping or casting, etc. When the bracket 216 is a split structure, it can be connected and fixed by welding, riveting, screw connection, etc. The bracket 216 is a ring-shaped structure, and the inside of the ring-shaped structure constitutes an installation space.

[0075] like Figure 1 As shown, the first magnetic component 213 and the second magnetic component 214 are respectively arranged in the installation space and connected and fixed on the inner wall of the installation space. The first magnetic component 213 and the second magnetic component 214 are arranged opposite to each other in the installation space. The space between the first magnetic component 213 and the second magnetic component 214 is the middle area. The first magnetic component 213, the second magnetic component 214 and the bracket 216 constitute a closed magnetic circuit. The magnetic field strength of the closed magnetic circuit is the largest in the middle area.

[0076] like Figure 1 As shown, the first magnetic member 213 includes a first magnetic concentrator and a first magnet connected to each other. The first magnet is arranged on the inner side of the bracket 216 with a ring structure and is connected and fixed to the bracket 216. The first magnetic concentrator is arranged in the tube body and is arranged close to the first magnet. The first magnet is a rare earth magnetic material, which includes but is not limited to a neodymium iron boron alloy, a samarium cobalt alloy, a platinum cobalt alloy, and an aluminum nickel cobalt alloy. By setting the first magnet to different material parts, the magnetic declination of the first magnet can be adjusted, so that the first magnetic member 213 can meet the use requirements of the magnetron 210. The first magnetic concentrator is a first conical member. Along the direction from the first magnetic concentrator to the second magnetic concentrator, the first conical member presents a first tapered structure, so that the magnetic lines of force can be further gathered during the propagation process, so that the magnetic field density in the middle area between the first magnetic member 213 and the second magnetic member 214 can be further enhanced, so that the output power of the magnetron 210 can be improved.

[0077] like Figure 1As shown, the second magnetic member 214 includes a second magnetic concentrator and a second magnet connected to each other. The second magnet is arranged on the inner side of the bracket 216 with a ring structure and is connected and fixed to the bracket 216. The second magnetic concentrator is arranged in the tube body and is arranged close to the second magnet. The second magnet is a rare earth magnetic material, which includes but is not limited to a neodymium iron boron alloy, a samarium cobalt alloy, a platinum cobalt alloy, and an aluminum nickel cobalt alloy. By setting the second magnet to different material parts, the magnetic declination of the second magnet can be adjusted, so that the second magnetic member 214 can meet the use requirements of the magnetron 210. The second magnetic concentrator is a second conical member. Along the direction from the second magnetic concentrator to the first magnetic concentrator, the second conical member presents a second tapered structure, so that the magnetic lines of force can be further gathered during the propagation process, so that the magnetic field density in the middle area between the first magnetic member 213 and the second magnetic member 214 can be further enhanced, so that the output power of the magnetron 210 can be further improved.

[0078] like Figure 1 As shown, the tube body is plugged into the bracket 216 and passes through a closed magnetic circuit. Part of the tube body is located in the installation space and passes through the middle area. The anode assembly 212 and the cathode assembly 211 are respectively arranged in the tube body and corresponding to the middle area. The anode assembly 212 is provided with a resonant cavity and a penetration channel. The number of resonant cavities is multiple, and all the resonant cavity rings are evenly spaced in the circumference of the penetration channel and connected to the penetration channel. Part of the structure of the cathode assembly 211 is penetrated in the penetration channel and spaced from the inner wall of the penetration channel. The anode assembly 212 has a part of the emitting end extending to the outside of the installation space, and the cathode assembly 211 has a part of the cathode lead-out end 2111 extending to the outside of the bracket 216.

[0079] like Figure 1 As shown, the heat sink 215 can be a heat sink fin, which is sleeved on the tube body by interference fit to dissipate heat and cool it. At the same time, it can cooperate with a fan to quickly cool the pole tube to ensure that the magnetron 210 can operate stably and efficiently.

[0080] like Figure 1As shown, the shielding box 22 is fixedly mounted on the bracket 216 and is located outside the installation space, and the cathode assembly 211 has a cathode lead-out terminal 2111 part inserted in the shielding box 22. Wherein, the shielding box 22 is a metal material part, specifically including a box body 222 and a box cover 221, the box body 222 is connected and fixed with the bracket 216 (adhesion, welding, screw connection or riveting, etc.), the box cover 221 is connected and fixed with the box body 222 and closes the open end of the box body 222, and the connection mode of the box cover 221 and the box body 222 can be adhesion, welding or crimping connection, etc., and the shielding box 22 is used to realize the shielding of the side of the cathode assembly 211 with the cathode lead-out terminal 2111 to avoid the occurrence of microwave leakage. In addition, a shielding cover can be arranged inside the shielding box 22, and the shielding cover is attached to the inner surface of the shielding box 22, and the shielding cover is a mesh structure, and the diameter of the mesh is less than 1 / 4 wavelength of the microwave, and the shielding cover is used to realize further shielding of the microwave, so that the microwave leakage is further reduced.

[0081] It is further understood that, in an embodiment of the present invention, the connection line 233 is configured as a shielded power line.

[0082] The connecting wire 233 connects the through-hole capacitor 24 to the second coil 232 on the circuit board, and the through-hole capacitor 24 is connected to the cathode lead-out terminal 2111 through the first coil 231. During the operation of the magnetron 210, microwaves may leak from the cathode lead-out terminal 2111. By setting the connecting wire 233 as a shielded power line, microwaves may be prevented from leaking to the outside through the connecting wire 233, thereby effectively improving the safety during use.

[0083] It should be pointed out that in an embodiment of the present invention, the shielded power cord includes two conductors, which are respectively used for transmitting electric energy. A shielding layer is wrapped around the outside of the two conductors, and the shielding layer is a metal layer. A protective layer (rubber layer, etc.) is provided on the outside of the shielding layer.

[0084] Furthermore, if Figure 3 and Figure 4 As shown, the cathode lead-out terminal 2111 of the cathode assembly 211 includes two parts, namely a first lead-out terminal 2111a and a second lead-out terminal 2111b. The corresponding through-hole capacitor 24 has two connection terminals, namely a first connection terminal 241 and a second connection terminal 242.

[0085] In the embodiment of the present invention, there are two first coils 231 , the first lead end 2111 a is electrically connected to the first connection end 241 through one first coil 231 , and the second lead end 2111 b is electrically connected to the second connection end 242 through another first coil 231 .

[0086] Specifically, the first lead-out terminal 2111a and the second lead-out terminal 2111b are respectively used for the input and output of the current of the cathode assembly 211, and the first coil 231 is provided on both the input side and the output side of the current, thereby effectively improving the filtering effect and effectively ensuring the performance of the magnetron 210.

[0087] It should be pointed out that, in the embodiment of the present invention, the number of the first coils 231 is two. On one side, the first connection end 241 is connected to one of the first coils 231 by welding, and the first lead-out end 2111a is connected to the first coil 231 by welding; similarly, the second connection end 242 is connected to the other first coil 231 by welding, and the second lead-out end 2111b is connected to the first coil 231 by welding.

[0088] Furthermore, the first coil 231 includes a first spiral body, and the cathode lead-out terminal 2111 is electrically connected to the through-hole capacitor 24 through the first spiral body.

[0089] In an embodiment of the present invention, the first spiral body includes a plurality of first spiral bodies. By providing the first spiral body, the length of the first coil 231 can be increased within a certain space, thereby effectively improving the filtering effect and ensuring the performance of the magnetron 210.

[0090] Furthermore, if Figure 6 As shown, the first spiral coil includes three sections connected in sequence, namely a first closely wound section 2311 , a first sparsely wound section 2312 and a second closely wound section 2313 .

[0091] Specifically, the first densely wound section 2311 and the second densely wound section 2313 are respectively connected to opposite ends of the first sparsely wound section 2312, the through-hole capacitor 24 is electrically connected to the first densely wound section 2311, and the cathode lead-out terminal 2111 is electrically connected to the second densely wound section 2313. There is no gap between the coils in the first densely wound section, there is no gap between the coils in the second densely wound section, there is a gap between the coils in the first sparsely wound section, and there is a gap between the first sparsely wound section and the first densely wound section and the second densely wound section. There is no gap between the densely wound coils, which can reduce the space occupied, and the magnetic flux and capacitance are larger when densely wound, which enhances the practicality of the filter device.

[0092] It should be noted that the number of turns of the first densely wound wire segment is in the range of 3 to 6 turns, preferably, the first densely wound wire segment is 3.25 turns; the number of turns of the second densely wound wire segment is in the range of 3 to 6 turns, preferably, the second densely wound wire segment is 5.25 turns; the number of turns of the first sparsely wound wire segment is 4 turns. That is to say, preferably, the first spiral coil body is wound 12.5 turns in total.

[0093] In addition, the outer diameter of the first spiral coil is in the range of 4.5 mm to 6.8 mm, or the inductance of the first spiral coil is in the range of 0.3 to 0.6 μH. Therefore, it can be ensured that the filter component 23 can still have a good suppression effect on the common mode signal under the condition of the volume of the first coil 231.

[0094] Furthermore, if Figure 6 As shown, the first coil 231 also includes a first magnetic core 2314, wherein the first magnetic core 2314 is disposed in at least one of the first sparsely wound section 2312, the first densely wound section 2311, and the second densely wound section 2313. For example, the first iron core is disposed in the first sparsely wound section 2312, the first densely wound section 2311, and the second densely wound section 2313; for example, the first iron core is disposed in the first sparsely wound section 2312 and the first densely wound section 2311; for example, the first iron core is disposed in the first sparsely wound section 2312 and the second densely wound section 2313; for example, the first iron core is disposed in the first densely wound section 2311 and the second densely wound section 2313; for example, the first iron core is disposed in the first sparsely wound section 2312; for example, the first iron core is disposed in the first densely wound section 2311; for example, the first iron core is disposed in the second densely wound section 2313.

[0095] Specifically, in an embodiment of the present invention, the first magnetic core 2314 is passed through the first closely wound section 2311 . By providing the first magnetic core 2314 , the suppression effect on common mode noise can be enhanced, so that the filtering performance of the filtering component 23 is effectively improved.

[0096] It should be noted that, in the embodiment of the present invention, the first magnetic core 2314 is a ferrite core element.

[0097] Furthermore, the second coil 232 includes a second spiral body, and the power supply structure of the circuit board is electrically connected to the through-hole capacitor 24 through the second spiral body and the connecting line 233 .

[0098] In the embodiment of the present invention, the second spiral body includes a plurality of second spiral bodies. By providing the second spiral body, the length of the second coil 232 can be increased within a certain space, thereby effectively improving the filtering effect and ensuring the performance of the magnetron 210.

[0099] Furthermore, if Figure 7 As shown, the second spiral coil includes three segments connected in sequence, namely a third closely wound segment 2321 , a second sparsely wound segment 2322 and a fourth closely wound segment 2323 .

[0100] Specifically, the third closely wound segment 2321 and the fourth closely wound segment 2323 are respectively connected to opposite ends of the second sparsely wound segment 2322, the connecting wire 233 is electrically connected to the fourth closely wound segment 2323, and the power supply structure is electrically connected to the third closely wound segment 2321. There is no gap between the coils in the third closely wound segment, there is no gap between the coils in the fourth closely wound segment, there is a gap between the coils in the second sparsely wound segment, and there is a gap between the second sparsely wound segment and the third closely wound segment and the fourth closely wound segment. There is no gap between the closely wound coils, which can reduce the space occupied, and the magnetic flux and capacitance are larger when closely wound, which enhances the practicality of the filtering device.

[0101] It should be noted that the number of turns of the third closely wound wire segment is in the range of 3 to 6 turns, preferably, the third closely wound wire segment is 3.25 turns; the number of turns of the fourth closely wound wire segment is in the range of 3 to 6 turns, preferably, the fourth closely wound wire segment is 5.25 turns; the number of turns of the second sparsely wound wire segment is 4 turns. That is to say, preferably, the second spiral coil body is wound 12.5 turns in total.

[0102] In addition, the outer diameter of the second spiral coil is in the range of 4.5 mm to 6.8 mm, or the inductance of the second spiral coil is in the range of 0.3 to 0.6 μH. Therefore, it can be ensured that the filter component 23 can still have a good suppression effect on the common mode signal under the condition of the volume of the first coil 231.

[0103] Furthermore, if Figure 7 As shown, the second coil 232 also includes a second magnetic core 2324, wherein the second magnetic core 2324 is arranged in at least one of the second sparse winding section 2322, the third dense winding section 2321 and the fourth dense winding section 2323. For example, the second iron core is arranged in the second sparse winding section 2322, the third dense winding section 2321 and the fourth dense winding section 2323; for example, the second iron core is arranged in the second sparse winding section 2322 and the third dense winding section 2321; for example, the second iron core is arranged in the second sparse winding section 2322 and the fourth dense winding section 2323; for example, the second iron core is arranged in the third dense winding section 2321 and the fourth dense winding section 2323; for example, the second iron core is arranged in the second sparse winding section 2322; for example, the second iron core is arranged in the third dense winding section 2321; for example, the second iron core is arranged in the fourth dense winding section 2323.

[0104] Specifically, in an embodiment of the present invention, the second magnetic core 2324 is passed through the third closely wound section 2321 . By providing the second magnetic core 2324 , the suppression effect on common mode noise can be enhanced, so that the filtering performance of the filtering component 23 is effectively improved.

[0105] It should be noted that, in the embodiment of the present invention, the second magnetic core 2324 is a ferrite core element.

[0106] like Figures 1 to 11 As shown, the present invention also proposes a cooking device 100, which includes a microwave generating assembly 20, and the microwave generating assembly 20 includes a magnetron 210, a waveguide 220, and a stirring member 230. One end of the waveguide 220 is connected to the magnetron 210, and the other end of the waveguide 220 is connected to the cooking cavity 11 of the body 10 of the cooking device 100. The stirring member 230 cooperates with the waveguide 220, and the stirring member 230 stirs the microwaves entering the cooking cavity 11 through the waveguide 220, so as to make the microwaves entering the cooking cavity 11 more uniform.

[0107] Specifically, the cooking appliance 100 includes a circuit board 30, on which a power supply structure is provided. The second coil 232 of the magnetron 210 is arranged on the circuit board of the magnetron 210. The power supply structure of the circuit board is electrically connected to the lead-out end of the cathode assembly 211 through the second coil 232, the connecting wire 233, the through-hole capacitor 24, and the first coil 231. The first coil 231 and the second coil 232 are used to filter out noise during use to ensure the EMC (Electro Magnetic Compatibility) performance of the magnetron 210.

[0108] By disposing the first coil 231 in the shielding box 22 and the second coil 232 on the circuit board of the cooking utensil 100, the space occupied by the filter component 23 in the shielding box 22 can be reduced. On the premise of meeting the shielding and distance requirements from the filter component 23, the volume of the shielding box 22 can be effectively reduced, thereby reducing the overall volume of the magnetron 210. When the magnetron 210 is used in the cooking utensil 100, the space utilization rate of the cooking utensil 100 can be effectively improved.

[0109] In the present invention, the above-mentioned cooking utensil is a microwave oven (in other embodiments, the cooking utensil is a microwave oven-steamer-oven, etc.), and the structure of other parts of the microwave oven can be referred to the prior art, and will not be described in detail in this application.

[0110] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A magnetron for a cooking appliance, characterized in that: The magnetron comprises: A tube core having a cathode lead terminal; A shielding box, the shielding box is connected to the tube core, and the cathode lead-out terminal is arranged in the shielding box; A through-hole capacitor, wherein the through-hole capacitor cooperates with the shielding box, and a part of the body of the through-hole capacitor is located inside the shielding box; A filter component, the filter component comprising a first coil, a second coil and a connecting wire, the first coil being arranged in the shielding box, the through-hole capacitor being electrically connected to the cathode lead-out terminal through the first coil, the second coil being arranged outside the shielding box and being used to be arranged on a circuit board of the cooking utensil, the second coil being electrically connected to a power supply structure of the circuit board, and the through-hole capacitor being electrically connected to the first coil through the connecting wire.

2. The magnetron according to claim 1, characterized in that: The connecting wire is a shielded power wire.

3. The magnetron according to claim 1, characterized in that: The cathode lead-out terminal includes a first lead-out terminal and a second lead-out terminal, the through-hole capacitor includes a first connection terminal and a second connection terminal, the number of the first coils is two, the first connection terminal is connected to the first lead-out terminal through one of the first coils, and the second connection terminal is connected to the second lead-out terminal through another of the first coils.

4. The magnetron according to claim 1, characterized in that: The first coil includes a first spiral body, one end of the first spiral body is electrically connected to the cathode lead-out terminal, and the other end of the first spiral body is electrically connected to the through-hole capacitor.

5. The magnetron according to claim 4, characterized in that: The first spiral coil comprises: a first closely wound section, one end of which is electrically connected to the through-hole capacitor; a first sparsely wound section, one end of the first sparsely wound section being connected to the other end of the first densely wound section; A second closely wound section, one end of which is electrically connected to the cathode lead-out terminal, and the other end of which is connected to the other end of the first sparsely wound section.

6. The magnetron according to claim 5, characterized in that: The first coil further includes a first magnetic core, and the first magnetic core is at least disposed in one of the first densely wound section, the first sparsely wound section, and the second densely wound section.

7. The magnetron according to claim 1, characterized in that: The second coil includes a second spiral body, one end of the second spiral body is used to be electrically connected to the power supply structure of the circuit board, and the other end of the second spiral body is electrically connected to the connecting line.

8. The magnetron according to claim 7, characterized in that: The second spiral coil comprises: a third closely wound section, one end of which is used to be electrically connected to the power supply structure of the circuit board; a second sparsely wound section, one end of the second sparsely wound section being connected to the other end of the third densely wound section; A fourth closely wound segment, one end of which is electrically connected to the connecting line, and the other end of which is connected to the other end of the second sparsely wound segment.

9. The magnetron according to claim 8, characterized in that: The first coil further includes a second magnetic core, and the second magnetic core is at least disposed in one of the third densely wound section, the second sparsely wound section, and the fourth densely wound section.

10. A cooking utensil, characterized in that: The cooking appliance comprises: The magnetron according to any one of claims 1 to 9; A circuit board is arranged outside the shielding box, and the second coil is electrically connected to a power supply structure of the circuit board.

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