Magnetron and microwave cooking electric appliance

Abstract

The invention discloses a magnetron and a microwave cooking electric appliance. The magnetron comprises an anode, a cathode, a first magnet and a second magnet; the anode and the cathode are opposite in a spaced mode, the anode and the cathode are located between the first magnet and the second magnet, and at least one of the first magnet and the second magnet is an electromagnet. According to the magnetron, at least one of the first magnet and the second magnet is the electromagnet, the output power of the magnetron can be adjusted by adjusting the electric signal parameters (such as voltage or current) of the electromagnet, and the adjusting range of the output power of the magnetron is enlarged.

Description

Technical Field

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

[0002] In the related art, a microwave oven includes a magnetron. When the microwave oven is working, the magnetron can generate microwaves, which can be fed into the cooking cavity by an antenna to heat and cook food. At present, the magnetron uses a permanent magnet to provide a magnetic field, and the output power is constant. The output power of the magnetron can only be adjusted by reducing the input power of the power supply, and the output power adjustment range of the magnetron is limited. Summary of the invention

[0003] The embodiments of the present invention provide a magnetron and a microwave cooking appliance to solve at least one of the above-mentioned technical problems.

[0004] A magnetron according to an embodiment of the present invention includes an anode, a cathode, a first magnet and a second magnet;

[0005] The anode and the cathode are spaced apart from each other and are located between the first magnet and the second magnet. At least one of the first magnet and the second magnet is an electromagnet.

[0006] In the above magnetron, at least one of the first magnet and the second magnet is an electromagnet, and the output power of the magnetron can be adjusted by adjusting the electrical signal parameters (such as voltage or current) of the electromagnet, thereby increasing the adjustment range of the magnetron output power.

[0007] In some embodiments, the anode is ring-shaped, and the cathode passes through a through hole surrounded by the anode.

[0008] In some embodiments, the magnetron includes a sleeve, the anode and the cathode are located in the sleeve, the anode is connected to the inner side of the sleeve, and a heat sink is connected to the outer side of the sleeve.

[0009] In some embodiments, the heat sink is connected to the electromagnet.

[0010] In some embodiments, the radiator includes a plurality of heat sinks arranged along the axial direction, each of the heat sinks includes a barrel portion and a heat sink portion, the barrel portion is sleeved and connected to the sleeve, the heat sink portion is connected to a side of the barrel portion away from the sleeve, the heat sink portion is bent, and the heat sink portion of at least one of the heat sinks is connected to the electromagnet.

[0011] In some embodiments, the heat dissipation portion is provided on both sides of the cylinder along the radial direction.

[0012] In some embodiments, the heat dissipation portion includes an axial portion, the axial portion extends along the axial direction of the cylinder, and the axial portion is in contact with the electromagnet.

[0013] In some embodiments, in a direction radially away from the barrel, the two heat dissipation portions closest to the electromagnet both include the axial portion, a heat dissipation channel is formed between the two axial portions of the two heat dissipation portions, and the axial portion closest to the electromagnet is in contact with the electromagnet.

[0014] In some embodiments, the magnetron includes an air duct member, in which an air duct is provided, the anode, the cathode, the first magnet, the second magnet and the heat sink are located in the air duct, one end of the heat sink is connected to the sleeve, and the other end of the heat sink is connected to the side wall of the air duct member facing the air duct.

[0015] A microwave cooking appliance according to an embodiment of the present invention comprises the magnetron according to any one of the above embodiments.

[0016] In the above microwave cooking appliance, at least one of the first magnet and the second magnet is an electromagnet, and the output power of the magnetron can be adjusted by adjusting the electrical signal parameters (such as voltage or current) of the electromagnet, thereby increasing the adjustment range of the magnetron output power.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0019] Figure 1 is a schematic cross-sectional view of a magnetron according to an embodiment of the present invention;

[0020] Figure 2 is a cross-sectional schematic diagram of an electromagnet according to an embodiment of the present invention;

[0021] Figures 3 to 7 Schematic cross-sectional view of a heat sink according to an embodiment of the present invention.

[0022] Description of reference numerals:

[0023] Magnetron 100, anode 12, cathode 14, first magnet 16, second magnet 18, electromagnet 20, interaction space 22, electromagnetic coil 24, magnetic core 26, energy output window 28, through hole 30, sleeve 32, heat sink 34, heat sink 36, insulating bracket 38, barrel 40, heat sink 42, axial portion 44, heat dissipation channel 46, heat sink plate 48, air duct member 50, air duct 52. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium. It can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0028] The disclosure below provides many different embodiments or examples to realize different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0029] Please refer to Figure 1 to Figure 2 A magnetron 100 provided in an embodiment of the present invention includes an anode 12, a cathode 14, a first magnet 16, and a second magnet 18. The anode 12 and the cathode 14 are spaced apart from each other, and the anode 12 and the cathode 14 are located between the first magnet 16 and the second magnet 18, and at least one of the first magnet 16 and the second magnet 18 is an electromagnet 20.

[0030] In the above-mentioned magnetron 100, at least one of the first magnet 16 and the second magnet 18 is an electromagnet 20. The output power of the magnetron 100 can be adjusted by adjusting the electrical signal parameters (such as voltage or current) of the electromagnet 20, thereby increasing the adjustment range of the output power of the magnetron 100.

[0031] Specifically, the anode 12 and the cathode 14 are spaced apart from each other and form an interaction space 22. Figure 1 In the illustrated embodiment, the first magnet 16 is an upper magnet, the second magnet 18 is a lower magnet, and both the first magnet 16 and the second magnet 18 are electromagnets 20. In one embodiment, the first magnet 16 is a permanent magnet, and the second magnet 18 is an electromagnet 20. In one embodiment, the first magnet 16 is an electromagnet 20, and the second magnet 18 is a permanent magnet.

[0032] The electromagnet 20 may be an electromagnet 20 with a magnetic core or an electromagnet 20 without a magnetic core. Figure 2The electromagnet 20 shown is an electromagnet with a magnetic core, specifically, the electromagnet 20 includes an electromagnetic coil 24 and a magnetic core 26, and the magnetic core 26 is arranged in the space surrounded by the electromagnetic coil 24. The material of the electromagnetic coil 24 includes but is not limited to copper, silver, aluminum, alloy materials, etc. The magnetic core 26 can be a magnetic metal oxide, such as nickel-zinc ferrite, manganese-zinc oxide, and nickel-zinc oxide.

[0033] Depending on whether the magnetic core 26 is present, the magnetron 100 of the present invention includes the following embodiments:

[0034] 1. The first magnet 16 and the second magnet 18 are both electromagnets 20, and neither has a magnetic core 26;

[0035] 2. The first magnet 16 and the second magnet 18 are both electromagnets 20, and one of the electromagnets 20 has a magnetic core 26;

[0036] 3. The first magnet 16 is an electromagnet 20 (with or without a magnetic core 26 ), and the second magnet 18 is a permanent magnet;

[0037] 4. The second magnet 18 is an electromagnet 20 (with or without a magnetic core 26 ), and the first magnet 16 is a permanent magnet.

[0038] The working principle of the magnetron 100 is as follows: when the magnetron 100 is working, Figure 1 As shown, a DC voltage (such as a DC voltage of several thousand volts) is applied between the cathode 14 and the anode 12, and at the same time, the electromagnet 20 is energized to provide a magnetic field in the interaction space 22. The DC electric field and the DC magnetic field in the interaction space 22 are perpendicular to each other. The cathode 14 emits electrons, which are accelerated by the electric field force and deflected by the magnetic field force. They perform stable oscillating motion in the interaction space 22. The electron motion speed is proportional to the ratio E / B, where E is the electric field strength and B is the magnetic flux density. The energy obtained by the electron flow emitted by the cathode 14 from the electric field in the interaction space 22 is transferred to the high-frequency field under certain conditions and output to the outside through the energy output window 28 to form microwaves.

[0039] When the first magnet 16 and the second magnet 18 are energized (which may be a constant voltage or constant current source), a magnetic field can be provided. By adjusting the electrical signal parameters (such as the working voltage or the working current) of the electromagnet 20, the central magnetic field of the magnetron 100 can be adjusted. In combination with adjusting the high voltage power supply of the magnetron 100, the output power of the magnetron 100 can be adjusted between zero and the maximum power (for example, if the maximum working current of the electromagnet 20 is I, the maximum central magnetic field provided is B, the electric field is E, and the maximum output power is m, then the output power of the magnetron 100 can be adjusted between 0W (watt) and mW). The relationship between the electrical signal parameters of the electromagnet 20, the central magnetic field, the electric field and the output power can be pre-calibrated and stored in the microwave cooking appliance through simulation, testing, etc., and accordingly, the relationship between the electrical signal parameters of the electromagnet 20, the voltage of the anode 12, the current of the cathode 14 and the output power can also be pre-calibrated and stored in the microwave cooking appliance through simulation, testing, etc. By setting the output power of the magnetron 100 , the combination of the electrical signal parameters of the electromagnet 20 , the voltage of the anode 12 and the current of the cathode 14 can be obtained through the above relationship, and the output of the set output power of the magnetron 100 can be obtained.

[0040] In some embodiments, the anode 12 is ring-shaped, and the cathode 14 passes through a through hole 30 surrounded by the anode 12 .

[0041] In this way, the working efficiency of the magnetron 100 can be improved.

[0042] Specifically, a through hole 30 is formed in the middle of the annular anode 12, and the cathode 14 is penetrated by the through hole 30, so that the cathode 14 is opposite to the anode 12 in the circumferential direction of 360 degrees. The relative area between the anode 12 and the cathode 14 is large. When the magnetron 100 is working, the cathode 14 can emit electrons in the circumferential direction of 360 degrees, so that the cathode 14 emits more electrons, which can improve the working efficiency of the magnetron 100.

[0043] In some embodiments, the magnetron 100 includes a sleeve 32 , in which the anode 12 and the cathode 14 are located. The anode 12 is connected to the inner side of the sleeve 32 , and a heat sink 34 is connected to the outer side of the sleeve 32 .

[0044] In this way, the magnetron 100 can be cooled, thereby ensuring the working performance of the magnetron 100 and extending the service life of the magnetron 100 .

[0045] Specifically, since the output power of the magnetron 100 is high and the heat generated is large, the temperature rise of the anode 12 will be high. The high temperature rise will seriously affect the working performance and service life of the magnetron 100. Therefore, the magnetron 100 needs to be cooled and dissipated.

[0046] The anode 12 is located in the sleeve 32 and connected to the sleeve 32, and the sleeve 32 is connected to the radiator 34. The heat of the anode 12 can be transferred to the radiator 34 through the sleeve 32 for dissipation, so that the magnetron 100 works within a normal temperature range, ensuring the working performance of the magnetron 100 and extending the service life of the magnetron 100. The radiator 34 can adopt air cooling or water cooling or a combination of air cooling and water cooling, which is not specifically limited here.

[0047] The present invention does not specifically limit the material of the heat sink 34 . In one example, the heat sink 34 can be made of copper, aluminum, or aluminum alloy. The cathode 14 can be installed in the sleeve 32 through an insulating bracket 38 .

[0048] In certain embodiments, the heat sink 34 is coupled to the electromagnet 20 .

[0049] In this way, the electromagnet 20 can be cooled, thereby ensuring the working performance of the magnetron 100 and extending the service life of the magnetron 100 .

[0050] Specifically, since Joule heat is generated when the electromagnetic coil 24 is energized, it is necessary to dissipate heat from the electromagnet 20. The heat sink 34 is connected to the electromagnet 20, and the heat generated by the electromagnet 20 during operation can be transferred to the heat sink 34 for dissipation, thereby ensuring that the electromagnet 20 operates within a normal temperature range, ensuring the working performance of the magnetron 100, and extending the service life of the magnetron 100.

[0051] It should be noted that when the heat sink 34 is connected to the electromagnet 20 , it is necessary to electrically isolate the heat sink 34 and the electromagnet 20 to achieve heat transfer without transferring electricity.

[0052] In some embodiments, the radiator 34 includes a plurality of heat sinks 36 arranged along the axial direction, each heat sink 36 includes a barrel 40 and a heat dissipation portion 42, the barrel 40 is sleeved and connected to the sleeve 32, the heat dissipation portion 42 is connected to the side of the barrel 40 away from the sleeve 32, the heat dissipation portion 42 is bent, and the heat dissipation portion 42 of at least one heat sink 36 is connected to the electromagnet 20.

[0053] In this way, the heat dissipation area of ​​the heat sink 34 can be increased.

[0054] Specifically, on one hand, a plurality of heat sinks 36 can be sequentially arranged along the axial direction of the sleeve 32. A plurality of barrels 40 are sleeved on the sleeve 32 along the axial direction of the sleeve 32 and connected to the sleeve 32, so that a larger surface area of ​​the sleeve 32 is connected to the barrel 40, thereby increasing the heat transfer area between the sleeve 32 and the barrel 40. Figure 1 In the embodiment, the axial direction of the sleeve 32 is parallel to the axial direction of the barrel 40, and the axial directions of the sleeve 32 and the barrel 40 are both in the up-down direction, and the number of the heat sinks 36 is 5. It can be understood that the present invention does not specifically limit the number of the heat sinks 36.

[0055] On the other hand, the heat dissipation portion 42 is connected to the side of the barrel 40 away from the sleeve 32, the heat of the anode 12 can be transferred to the sleeve 32, the sleeve 32 can transfer the heat to the barrel 40, and the barrel 40 can transfer the heat to the heat dissipation portion 42. The bent heat dissipation portion 42 increases the heat dissipation area of ​​the radiator 34. In addition, part of the heat will be dissipated during the heat transfer process.

[0056] In summary, the structure of the radiator 34 increases the heat dissipation area of ​​the radiator 34 , further ensuring the working performance of the magnetron 100 and extending the service life.

[0057] The heat dissipation portion 42 may have at least one bend. Figure 1 In the embodiment, the number of the heat sinks 36 is 5, the heat sink portions 42 of some of the heat sinks 36 have 3 bends, and the heat sink portions 42 of some of the heat sinks 36 have 4 bends.

[0058] In some embodiments, heat dissipation portions 42 are disposed on both sides of the cylinder portion 40 in the radial direction.

[0059] In this way, the heat dissipation efficiency of the magnetron 100 can be improved.

[0060] Specifically, in Figure 1 In the figure, the radial direction of the barrel 40 is parallel to the radial direction of the sleeve 32, and the radial direction of the barrel 40 is along the left-right direction. The two sides of the barrel 40 along the radial direction can be the left side and the right side of the barrel 40. The left side and the right side of the barrel 40 are both provided with a heat dissipation portion 42, so that the heat of the barrel 40 can be dissipated from the left and right sides to the heat dissipation portion 42, thereby improving the heat dissipation efficiency of the magnetron 100.

[0061] In some embodiments, please combine Figure 1 and Figure 3 The heat dissipation portion 42 includes an axial portion 44 , which extends along the axial direction of the cylinder portion 40 , and the axial portion 44 is in contact with the electromagnet 20 .

[0062] In this way, the heat dissipation efficiency of the electromagnet 20 can be improved.

[0063] Specifically, the axial portion 44 of the heat dissipation portion 42 extends along the axial direction of the cylinder portion 40. Figure 1 In the embodiment, the axial direction of the cylinder 40 is along the up-down direction, the axial portion 44 extends along the up-down direction, the axial portion 44 is in contact with the electromagnet 20, and the contact area between the axial portion 44 and the electromagnet 20 is large, which can improve the heat dissipation efficiency of the electromagnet 20. In one embodiment, the axial portion 44 is in contact with the outer side of the electromagnetic coil 24 of the electromagnet 20.

[0064] exist Figure 1In the embodiment, the number of heat sinks 36 is 5, and both the first magnet 16 and the second magnet 18 are electromagnets 20. Along the axial direction of the sleeve 32, the left heat sink 42 of the heat sink 36 closest to the first magnet 16 has a left axial portion 44, which is in contact with the left side of the electromagnet 20 as the first magnet 16, and the right heat sink 42 has a right axial portion 44, which is in contact with the right side of the electromagnet 20 as the first magnet 16. The left heat sink 42 of the heat sink 36 closest to the second magnet 18 has a left axial portion 44, which is in contact with the left side of the electromagnet 20 as the second magnet 18, and the right heat sink 42 has a right axial portion 44, which is in contact with the right side of the electromagnet 20 as the second magnet 18.

[0065] In some embodiments, please combine Figure 1 and Figure 3 to Figure 4 In the direction radially away from the cylinder 40 , the two heat dissipation parts 42 closest to the electromagnet 20 both include an axial portion 44 , a heat dissipation channel 46 is formed between the two axial portions 44 of the two heat dissipation parts 42 , and the axial portion 44 closest to the electromagnet 20 is in contact with the electromagnet 20 .

[0066] In this way, the heat dissipation efficiency of the electromagnet 20 can be further improved.

[0067] Specifically, in Figure 1 In the embodiment, the heat sink 34 includes five heat sinks 36. Figures 3 to 7 Each heat sink 36 has a heat sink 42 on the left and right sides of the barrel 40, and two heat sinks 48 are formed on the side of each heat sink 42 away from the barrel 40. The two heat sinks 48 are bent in opposite directions, for example, one heat sink 48 is bent upward and the other heat sink 48 is bent downward. The inclination angles of the two heat sinks 48 relative to the radial direction of the barrel 40 can be the same or different, which is not specifically limited here. The inclination angle includes an acute angle and a right angle.

[0068] The first magnet 16 and the second magnet 18 are both electromagnets 20. In the direction away from the barrel 40 along the radial direction of the barrel 40, the two heat dissipation parts 42 closest to the electromagnet 20 as the first magnet 16 are the two uppermost heat dissipation parts 42. In these two heat dissipation parts 42, the upwardly bent heat dissipation plate 48 of each heat dissipation part 42 has an axial part 44, and the length of the axial part 44 that fits the electromagnet 20 is greater than the length of the other axial part 44, thereby ensuring the heat dissipation efficiency of the electromagnet 20. A heat dissipation channel 46 is formed between the two axial parts 44, and the heat of the heat dissipation part 42 can be dissipated into the heat dissipation channel 46 and taken away by the cold wind, thereby further improving the heat dissipation efficiency of the electromagnet 20 as the first magnet 16.

[0069] The two heat dissipation parts 42 closest to the electromagnet 20 as the second magnet 18 are the two lower heat dissipation parts 42. In these two heat dissipation parts 42, the downwardly bent heat dissipation plate 48 of each heat dissipation part 42 has an axial part 44, and the length of the axial part 44 that fits the electromagnet 20 is greater than the length of the other axial part 44, thereby ensuring the heat dissipation efficiency of the electromagnet 20. A heat dissipation channel 46 is formed between the two axial parts 44, and the heat of the heat dissipation part 42 can be dissipated into the heat dissipation channel 46 and taken away by the cold wind, thereby further improving the heat dissipation efficiency of the electromagnet 20 as the second magnet 18.

[0070] In addition to the heat dissipation channels 46 formed at the two axial portions 44 , a heat dissipation channel 46 may also be formed between two heat dissipation plates 48 of two different heat dissipation portions 42 , so as to further improve the heat dissipation efficiency of the magnetron 100 .

[0071] In some embodiments, the magnetron 100 includes a duct member 50, in which a duct 52 is provided, and the anode 12, the cathode 14, the first magnet 16, the second magnet 18 and the heat sink 34 are located in the duct 52, one end of the radiator 34 is connected to the sleeve 32, and the other end of the radiator 34 is connected to the side wall of the duct member 50 facing the duct 52.

[0072] In this way, the heat dissipation efficiency of the magnetron 100 can be further improved.

[0073] Specifically, an air duct 52 is formed in the air duct member 50, and the cold air blown by the fan can enter the air duct 52 from one side of the air duct 52 and flow to the air duct 52 from the other side of the air duct 52. Since the main heating components of the magnetron 100: the anode 12 and the electromagnet 20 are all located in the air duct 52, the heat of the heating components can be dissipated into the air duct 52 by the radiator 34, and then taken away in time by the cold air in the air duct 52. At the same time, the heat of the heating components can also be directly taken away by the cold air, which can further improve the heat dissipation efficiency of the magnetron 100.

[0074] One end of the heat sink 34 is connected to the sleeve 32, and the other end of the heat sink 34 is connected to the side wall of the air duct member 50 facing the air duct 52. In addition to improving the structural strength of the air duct member 50, the material of the air duct member 50 is usually metal. The heat sink 34 can also transfer heat to the air duct member 50, and the heat can be dissipated from the surface of the air duct member 50, thereby increasing the heat dissipation area and further improving the heat dissipation efficiency of the magnetron 100.

[0075] A microwave cooking appliance according to an embodiment of the present invention includes a magnetron 100 according to any one of the above embodiments.

[0076] In the above-mentioned magnetron 100, at least one of the first magnet 16 and the second magnet 18 is an electromagnet 20. The output power of the magnetron 100 can be adjusted by adjusting the electrical signal parameters (such as voltage or current) of the electromagnet 20, thereby increasing the adjustment range of the output power of the magnetron 100.

[0077] Specifically, microwave cooking appliances include but are not limited to microwave ovens, microwave ovens, microwave steamers and ovens, integrated stoves and other appliances.

[0078] The microwave cooking appliance may also include a waveguide and an antenna. The waveguide connects the magnetron 100 and the antenna. The microwaves output from the energy output window 28 of the magnetron 100 can enter the waveguide. The waveguide transmits the microwaves to the antenna. The antenna feeds the microwaves into the cavity of the microwave cooking appliance to heat the food in the cavity.

[0079] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0080] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A magnetron, characterized in that: comprising an anode, a cathode, a first magnet and a second magnet; The anode and the cathode are spaced apart from each other and are located between the first magnet and the second magnet. At least one of the first magnet and the second magnet is an electromagnet.

2. The magnetron according to claim 1, characterized in that: The anode is ring-shaped, and the cathode passes through a through hole surrounded by the anode.

3. The magnetron according to claim 1, characterized in that: The magnetron comprises a sleeve, the anode and the cathode are located in the sleeve, the anode is connected to the inner side of the sleeve, and the outer side of the sleeve is connected to a radiator.

4. The magnetron according to claim 3, characterized in that: The heat sink is connected to the electromagnet.

5. The magnetron according to claim 4, characterized in that: The radiator includes a plurality of heat sinks arranged along the axial direction, each of the heat sinks includes a barrel portion and a heat sink portion, the barrel portion is sleeved and connected to the sleeve, the heat sink portion is connected to a side of the barrel portion away from the sleeve, the heat sink portion is bent, and the heat sink portion of at least one of the heat sinks is connected to the electromagnet.

6. The magnetron according to claim 5, characterized in that: The heat dissipation parts are provided on both sides of the cylinder along the radial direction.

7. The magnetron according to claim 5, characterized in that: The heat dissipation portion includes an axial portion, the axial portion extends along the axial direction of the cylinder, and the axial portion is in contact with the electromagnet.

8. The magnetron according to claim 7, characterized in that: In the direction radially away from the barrel, the two heat dissipation parts closest to the electromagnet both include the axial portion, a heat dissipation channel is formed between the two axial portions of the two heat dissipation parts, and the axial portion closest to the electromagnet is in contact with the electromagnet.

9. The magnetron according to claim 3, characterized in that: The magnetron includes an air duct member, in which an air duct is arranged, the anode, the cathode, the first magnet, the second magnet and the heat sink are located in the air duct, one end of the heat sink is connected to the sleeve, and the other end of the heat sink is connected to the side wall of the air duct member facing the air duct.

10. A microwave cooking appliance, characterized in that: A magnetron comprising any one of claims 1 to 9.

Images