Magnetron

Abstract

The invention discloses a magnetron, which comprises a tube core, a magnet, a plurality of radiating fins and a radiating bracket, and is characterized in that the axis of the tube core extends along a second direction; the magnets are located at two axial ends of the tube core; the plurality of radiating fins are arranged along the axial direction of the tube core, a gap is formed between every two adjacent radiating fins, each radiating fin is provided with a central hole for the tube core to pass through, a notch is formed in the side edge of each radiating fin along the third direction, and the second direction is perpendicular to the third direction; the tube core, the magnet and the plurality of radiating fins are arranged in the radiating support, and the notch is close to the side wall of the radiating support. According to the magnetron provided by the embodiment of the invention, the gaps are formed in the cooling fins, so that the heat exchange amount of the airflow and the tube core can be improved, the tube core can be better cooled, the temperature rise condition of the tube core is relieved, and the temperature rise condition of the magnetron is finally relieved.

Description

[0001] This application is a divisional application of the invention patent application with the application number 202010646838.3 and the application date of July 7, 2020. Technical Field

[0002] The present invention belongs to the technical field of magnetrons, and more specifically, relates to a magnetron. Background Art

[0003] A magnetron, with the English name Magnetron, was developed between 1936 and 1937 and was put on the market in 1939. It is a device that can generate microwave energy. The "magnet" in the magnetron refers to a magnetic field, and the "tube" refers to a diode. Therefore, a "magnetron" actually places a diode in a magnetic field. Under the combined action of the magnetic field and the generated electric field, the electrons in the tube convert the energy obtained in the electric field into microwave energy. The magnetron has many characteristics such as low cost, small size, high power, and high efficiency, and is now widely used. A magnetron is a vacuum electron tube that generates microwaves. Due to its characteristics such as high oscillation efficiency and large microwave output power, it is widely used as a microwave generation source for microwave application devices such as household microwave ovens and industrial microwave oven heating equipment.

[0004] Such as Figure 7 and Figure 8 As shown, the existing magnetron includes a tube core 1″, a heat dissipation system, a magnetic circuit system 3″, and a filtering system 4″. The heat dissipation system is composed of a heat sink 21″ and a support bracket 22″. The tube core 1″ is the main heat source, and the heat generation of the anode cylinder of the tube core 1″ is the largest. A number of heat sinks 21″ are sleeved around the anode cylinder to take out the heat of the anode cylinder and conduct heat exchange with the cooling air. In the related art, the cooling air passes through the gap between two adjacent heat sinks, and the air intake volume in the gap of each heat sink is the same. There is no air flow exchange between the heat sinks, and the heat dissipation efficiency and effect are poor. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems in the related art to some extent. For this reason, an object of the present invention is to provide a magnetron that can improve the overall heat dissipation effect.

[0006] The magnetron according to an embodiment of the present invention includes: a tube core, a magnet, a plurality of heat sinks, and a heat dissipation bracket. The axis of the tube core extends along a second direction; the magnet is located at both axial ends of the tube core; the plurality of heat sinks are arranged axially along the tube core and there is a gap between adjacent heat sinks. The heat sink has a central hole for the tube core to pass through. A notch is provided on the side of the heat sink along a third direction, and the second direction and the third direction are perpendicular to each other; the tube core, the magnet, and the plurality of heat sinks are arranged inside the heat dissipation bracket, and the notch is close to the side wall of the heat dissipation bracket.

[0007] For the magnetron according to an embodiment of the present invention, by providing a notch on the heat sink, the heat exchange amount between the air flow and the tube core can be increased, so as to better cool the tube core, relieve the temperature rise of the tube core, and ultimately relieve the temperature rise of the magnetron.

[0008] In addition, the magnetron according to the above embodiment of the present invention may further have the following additional technical features:

[0009] In some embodiments, the size a of the notch in the third direction satisfies a ≤ (d33 - d31) / 2, where d33 is the size of the heat dissipation bracket in the third direction, and d31 is the size of the magnet in the third direction.

[0010] In some embodiments, the size b of the notch in the first direction satisfies b ≤ d11, where d11 is the size of the magnet in the first direction, and the first direction, the second direction, and the third direction are perpendicular to each other in pairs.

[0011] In some embodiments, the notch includes two sub-notches spaced apart along the first direction, and the first direction, the second direction, and the third direction are perpendicular to each other in pairs.

[0012] In some embodiments, the region between the two sub-notches is opposite to the axis of the tube core in the third direction.

[0013] In some embodiments, the size c of the sub-notch in the first direction satisfies c ≤ d11 / 2, where d11 is the size of the magnet in the first direction.

[0014] In some embodiments, the notch is a rectangular hole.

[0015] In some embodiments, both the magnet and the tube core are cylindrical in shape.

[0016] In some embodiments, the heat dissipation bracket is a square tube extending in a first direction, and the first direction, the second direction, and the third direction are perpendicular to each other in pairs; and / or, the inner peripheral surface of the central hole abuts against the outer peripheral surface of the tube core; and / or, both sides of the heat dissipation fin along the third direction abut against the inner surfaces of the opposite side walls of the heat dissipation bracket.

[0017] In some embodiments, the heat dissipation fin is provided with a first flanging along the circumference of the central hole, and the first flanging is sleeved on the outer peripheral surface of the tube core; or, the heat dissipation fin is provided with a second flanging on both sides along the third direction, and the second flanging abuts against the inner side surface of the heat dissipation bracket; or, the heat dissipation fin is provided with a first flanging along the circumference of the central hole, the first flanging is sleeved on the outer peripheral surface of the tube core, the heat dissipation fin is provided with a second flanging on both sides along the third direction, and the second flanging abuts against the inner side surface of the heat dissipation bracket, and the first flanging and the second flanging extend towards the same side of the heat dissipation fin.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a perspective view of a magnetron according to an embodiment of the present invention;

[0020] Figure 2 is a schematic view of a magnetron according to an embodiment of the present invention, wherein the arrow shows the air flow direction inside the magnetron.

[0021] Figure 3 is a schematic view of a magnetron according to an embodiment of the present invention, wherein the arrow shows the air flow direction.

[0022] Figure 4 is a cross-sectional schematic view of a magnetron according to an embodiment of the present invention;

[0023] Figure 5 is a schematic view of a heat dissipation fin according to an embodiment of the present invention, wherein the heat dissipation fin is provided with a notch;

[0024] Figure 6 is a schematic view of a heat dissipation fin according to another embodiment of the present invention, wherein two sub-notches are provided on each side of the heat dissipation fin.

[0025] Figure 7 is a schematic diagram of the air flow of a magnetron in the prior art;

[0026] Figure 8 is a schematic diagram of the air flow in the magnetron according to an embodiment of the present invention;

[0027] Reference Signs:

[0028] Magnetron 1000, tube core 1, anode cylinder 11, heat dissipation system 2, magnet 3, filtering system 4, heat dissipation bracket 21, heat dissipation channel 212, heat sink 22, central hole 221, notch 222, sub-notch 2222, air flow channel 2224, first flanging 224, second flanging 226.

[0029] Figure 7 and Figure 8 Reference numerals of the related art shown: tube core 1″, magnetic circuit system 3″, filtering system 4″, heat sink 21″, support bracket 22″. Specific embodiments

[0030] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described by referring to the drawings below are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention. It should be understood that the various concepts and embodiments introduced above, as well as those described in more detail below, can be implemented in any of many ways, because the concepts and embodiments disclosed in the present invention are not limited to any embodiment. In addition, some of the solutions disclosed in the present invention can be used alone or in any suitable combination with other solutions disclosed in the present invention.

[0031] The magnetron 1000 according to an embodiment of the present invention will be described below with reference to the drawings.

[0032] Combined with Figures 1 to 6 , the magnetron 1000 according to an embodiment of the present invention includes: a heat dissipation bracket 21, a tube core 1, a magnet 3, and a plurality of heat sinks 22.

[0033] Specifically, the heat dissipation bracket 21 has a heat dissipation channel 212 extending along the first direction A-A, and the air flow flows through the heat dissipation channel 212; the die 1 is disposed in the heat dissipation bracket 21 and extends along the second direction B-B. It should be noted that the die 1 is disposed in the heat dissipation channel 212, and the air flow flows through the heat dissipation channel 212 and exchanges heat with the die 1 to achieve heat dissipation of the die 1. The magnets 3 are disposed in the heat dissipation bracket 21 and are located at both ends of the die 1 in the second direction B-B, and the width dimension of the magnets 3 in the third direction C-C is greater than the width dimension of the die 1 in the third direction C-C. It should be noted that the magnets 3 are disposed in the heat dissipation channel 212. The heat sink 22 has a central hole 221 and the die 1 passes through the central hole 221. A plurality of heat sinks 22 are arranged along the second direction B-B and there are gaps between adjacent heat sinks 22. Among them, two adjacent heat sinks 22 among the plurality of heat sinks 22 define the heat dissipation channel 212. At least one of the opposite sides of the heat sink 22 along the third direction C-C is provided with a notch 222. The notch 222 penetrates the heat sink 22 along the second direction B-B, and the notches 222 of at least a part of the plurality of heat sinks 22 are opposite in the second direction B-B to be adapted for the air flow to flow from both ends of the heat dissipation bracket 21 to the middle along the second direction B-B. The notch 222 is opposite to the central hole 221 in the third direction C-C, wherein the first direction A-A, the second direction B-B, and the third direction C-C are perpendicular to each other.

[0034] It can be understood that the air flow flows in the heat dissipation channel 212 to cool the die 1. Since the width dimension of the magnet 3 in the third direction C-C is greater than the width dimension of the die 1 in the third direction C-C, the area of the heat dissipation channel 212 passing through the magnet 3 is smaller than the area of the heat dissipation channel 212 passing through the die 1. The air pressure near the magnet 3 is higher than the air pressure near the die 1. According to the principle that air flow flows from a place with high air pressure to a place with low air pressure, since the magnet 3 and the die 1 are arranged along the second direction B-B, the air flow passing through near the magnet 3 will flow along the second direction B-B towards near the die 1. Since at least a part of the notches 222 in the plurality of heat sinks 22 are opposite in the second direction B-B, these notches 222 form an air flow channel 2224 along the second direction B-B, and the air flow flows from near the magnet 3 to near the die 1 via the air flow channel 2224. Thus, it can better enable the air flow to flow and exchange heat in the heat dissipation bracket 21, so as to better dissipate heat from the die 1. In addition, the position near the middle of the die 1 is generally the position of the heat source, where the temperature is the highest. The air flow near the magnets 3 at both ends of the die 1 flows towards the position near the die 1, which can enable the air flow to better converge to the position near the middle of the die 1. According to the formula q = hAΔT, where q is the heat exchange amount, h is the heat transfer coefficient, A is the heat dissipation area, and ΔT is the temperature difference between the air flow and the solid wall surface, the air flow near the magnets 3 at both ends of the die 1 flowing towards the position near the die 1 can increase the temperature difference ΔT. According to Newton's law of cooling, increasing the temperature difference ΔT can increase the heat transfer coefficient h. In this way, finally, the heat exchange amount between the air flow and the die 1 is increased, so as to better cool the die 1, relieve the temperature rise of the die 1, and finally relieve the temperature rise of the magnetron 1000.

[0035] According to the magnetron 1000 of the embodiment of the present invention, by providing at least one notch 222 on at least one of the opposite two side edges of the heat sink 22 along the third direction C-C, the notch 222 penetrates the heat sink 22 along the second direction B-B, and at least a part of the notches 222 in the plurality of heat sinks 22 are opposite in the second direction B-B, the heat exchange amount between the air flow and the die 1 can be increased, so as to better cool the die 1, relieve the temperature rise of the die 1, and finally relieve the temperature rise of the magnetron 1000.

[0036] Specifically, in combination with Figure 2, magnets 3 are provided at both ends of the heat dissipation bracket 21 along the second direction B-B. In this way, when the air flow passes through the magnets 3, due to the aforementioned air pressure imbalance, that is, the air pressure at the two magnets 3 is greater than the air pressure around the tube core 1 because of the small flow area, a part of the air flow at both ends of the heat dissipation bracket 21 along the third direction C-C will flow downward, thereby promoting more air flow to cool the tube core 1, that is, to concentrate on cooling the area with relatively large heat generation in the magnetron 1000, effectively improving the efficiency and effect of heat dissipation. Among them Figure 3 shows the flow path of the heat dissipation air flow in the magnetron 1000 according to an embodiment of the present invention.

[0037] Optionally, in combination with Figures 4 to 6 , a rectangular long hole is left at the contact between the heat sink 22 and the middle part of the heat dissipation bracket 21.

[0038] In combination with Figures 4 to 6 , according to some embodiments of the present invention, the size a of the notch 222 in the third direction C-C is a ≤ (d33 - d31) / 2, where d33 is the size of the heat dissipation channel 212 in the third direction C-C, and d31 is the size of the magnet 3 in the third direction C-C, that is, the width of the notch 222 in the third direction C-C is less than or equal to the distance from the inner surface of the heat dissipation bracket 21 to the outer diameter surface of the magnet 3. This can make the size of the notch 222 in the third direction C-C more reasonable, make the area of the heat sink 22 reasonable, and thus be able to combine the advantages of the air flow flowing through the notch 222 to dissipate heat from the tube core 1 and the advantages of the air flow flowing through the heat sink 22 to dissipate heat from the tube core 1, making the heat exchange effect between the tube core 1 and the air flow better, and thus being able to better alleviate the temperature rise of the magnetron 1000.

[0039] In combination with Figures 4 to 5 , according to some embodiments of the present invention, the size b of the notch 222 in the first direction A-A is b ≤ d11, where d11 is the size of the magnet 3 in the first direction A-A. Optionally, if the magnet 3 is cylindrical, the size of the notch 222 in the first direction A-A is less than the diameter of the magnet 3. This can make the size of the notch 222 in the first direction A-A more reasonable, make the area of the heat sink 22 reasonable, and thus be able to combine the advantages of the air flow flowing through the notch 222 to dissipate heat from the tube core 1 and the advantages of the air flow flowing through the heat sink 22 to dissipate heat from the tube core 1, making the heat exchange effect between the tube core 1 and the air flow better, and thus being able to better alleviate the temperature rise of the magnetron 1000.

[0040] Preferably, considering the manufacturability factors and taking into account the supporting effect of the heat dissipation bracket 21 on the heat sink 22, two long holes are left at the contact between the heat sink 22 and the middle part of the heat dissipation bracket 21.

[0041] Such as Figure 6As shown, according to some embodiments of the present invention, the notch 222 includes two sub - notches 2222 spaced apart along the first direction A - A. The portion of the heat sink 22 located between the two sub - notches 2222 can be connected to the heat dissipation bracket 21, thereby increasing the support strength for the heat sink 22 and thus enhancing the overall structural strength of the heat sink 22.

[0042] Optionally, the region between the two sub - notches 2222 is opposite to the axis of the die 1 in the third direction C - C. Thereby, the air flow passing through the two sub - notches 2222 can flow better through the die 1, and thus can exchange heat with the die 1 better.

[0043] As Figure 6 shown, optionally, the dimension c of the sub - notch 2222 in the first direction A - A satisfies c ≤ d11 / 2, where d11 is the dimension of the magnet 3 in the first direction A - A. The magnet 3 can be cylindrical. Therefore, the length dimension c of the sub - notch 2222 in the first direction A - A is not greater than the radius of the magnet 3. Thereby, the dimension of the sub - notch 2222 in the first direction A - A can be made reasonable, and the area of the heat sink 22 can be made reasonable. Thus, the advantages of heat dissipation of the air flow flowing through the sub - notch 2222 to the die 1 and the heat dissipation of the air flow flowing through the heat sink 22 to the die 1 can be combined, making the heat exchange effect between the die 1 and the air flow better, and thus better alleviating the temperature rise of the magnetron 1000.

[0044] According to some embodiments of the present invention, the notch 222 is a rectangular hole. Since at least a part of the notches 222 in the plurality of heat sinks 22 are opposite in the second direction B - B, the notches 222 define a rectangular air flow channel 2224 along the second direction B - B, which can make the air flow more easily flow from the position close to the magnet 3 to the position close to the die 1, making the heat exchange effect of the rectangular air flow channel 2224 better. Thereby, the heat exchange amount between the air flow and the die 1 is further increased, so as to better cool the die 1, alleviate the temperature rise of the die 1, and finally alleviate the temperature rise of the magnetron 1000.

[0045] In addition, the rectangular hole in the present application is formed by the cooperation of the notch 222 and the inner surface of the heat dissipation bracket 21. Therefore, when the heat dissipation air flow passes through the heat dissipation channel 212, under the action of the air pressure difference, the air flow will flow along the inner surface of the heat dissipation bracket 21 in the third direction, thereby improving the air flow effect and thus improving the heat dissipation effect on the die 1.

[0046] According to some embodiments of the present invention, both the magnet 3 and the die 1 are cylindrical, which makes the structures of the magnet 3 and the die 1 simple, convenient for production and assembly, and can simplify the process flow.

[0047] According to some embodiments of the present invention, the heat dissipation bracket 21 is a square tube extending along the first direction A-A, thereby making the processing of the heat dissipation bracket 21 simple and convenient and simplifying the processing process. The inner peripheral surface of the central hole 221 abuts against the outer peripheral surface of the tube core 1; both side edges of the heat dissipation fins 22 along the third direction C-C abut against the inner surfaces of the opposite side walls of the heat dissipation bracket 21.

[0048] As Figures 5 - 6 shown, according to some embodiments of the present invention, the heat dissipation fins 22 are provided with a first flanging 224 along the circumference of the central hole 221, and the first flanging 224 is sleeved on the outer peripheral surface of the tube core 1. Thereby, the heat dissipation fins 22 are supported by the tube core 1 on the first flanging 224, making the installation of the heat dissipation fins 22 in the heat dissipation bracket 21 more stable.

[0049] Combined with Figure 3 、 Figure 5 and Figure 6 it can be seen that the first flanging 224 can be in interference fit with the tube core 1, so as to promote more and faster heat transfer from the tube core 1 to the heat dissipation fins 22. When the air flow passes through the heat dissipation fins 22, these heats can be taken away, thereby effectively improving the heat dissipation effect on the tube core 1.

[0050] Optionally, as Figure 5 and Figure 6 shown, the heat dissipation fins 22 are provided with second flangings 226 on both side edges along the third direction C-C, and the second flangings 226 abut against the inner side surface of the heat dissipation bracket 21; thereby, the heat dissipation fins 22 are supported by the heat dissipation bracket 21 on the second flangings 226, making the installation of the heat dissipation fins 22 in the heat dissipation bracket 21 more stable.

[0051] In addition, when the second flangings 226 are provided on the heat dissipation fins 22, while improving the stable cooperation between the heat dissipation fins 22 and the heat dissipation bracket 21, it can also effectively increase the contact area between the heat dissipation structure (such as the heat dissipation fins 22, the heat dissipation bracket 21, etc.) and the heat dissipation air flow, thereby improving the heat dissipation effect of the magnetron 1000.

[0052] Optionally, the first flanging 224 and the second flanging 226 extend toward the same side of the heat dissipation fins 22. Thereby, it is convenient to install the heat dissipation fins 22 and improve the installation efficiency of the heat dissipation fins 22.

[0053] In addition, on the plurality of heat dissipation fins 22 arranged at intervals along the second direction B-B, both the first flanging 224 and the second flanging 226 are provided, and moreover, the first flanging 224 and the second flanging 226 of each heat dissipation fin 22 extend in the same direction, and the first flanging 224 and the second flanging 226 on the plurality of heat dissipation fins 22 all extend in the same direction.

[0054] In the present invention, a rectangular hole through which air flow can pass is provided at the contact position between the heat sink 22 and the heat dissipation bracket 21, so that the cooling air at the upper and lower ends of the magnetron 1000 is concentrated and gathered to the middle part of the magnetron 1000 with the highest temperature, improving the heat exchange capacity of the heat dissipation structure of the magnetron 1000, further reducing the anode temperature rise of the magnetron 1000 without changing the external volume, enhancing the performance stability of the magnetron 1000, and prolonging its service life.

[0055] Optionally, through holes are provided on two side walls of the heat dissipation bracket in the present invention that are opposite to each other along the third direction C-C.

[0056] In the description of the present specification, the description with reference to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In the present specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of different embodiments or examples.

[0057] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A magnetron, characterized in that, Comprising: A die, the axis of the die extending in a second direction; Magnets located at both axial ends of the die; A plurality of heat sinks arranged axially along the die, with gaps between adjacent heat sinks. The heat sinks have central holes for the die to pass through, and notches are provided on the side edges of the heat sinks in a third direction, and the second direction and the third direction are perpendicular to each other; A heat dissipation bracket, the die, the magnets and the plurality of heat sinks are arranged inside the heat dissipation bracket, and the notch is close to the side wall of the heat dissipation bracket.

2. The magnetron according to claim 1, characterized in that, The size a of the notch in the third direction is ≤ (d33 - d31) / 2, where d33 is the size of the heat dissipation bracket in the third direction and d31 is the size of the magnet in the third direction.

3. The magnetron according to claim 1, characterized in that, The size b of the notch in the first direction is ≤ d11, where d11 is the size of the magnet in the first direction, and the first direction, the second direction and the third direction are perpendicular to each other in pairs.

4. The magnetron according to claim 1 or 2, characterized in that, The notch includes two sub-notches spaced apart in the first direction, and the first direction, the second direction and the third direction are perpendicular to each other in pairs.

5. The magnetron according to claim 4, characterized in that, The region between the two sub-notches is opposite to the axis of the die in the third direction.

6. The magnetron according to claim 5, characterized in that, The size c of the sub-notch in the first direction is ≤ d11 / 2, where d11 is the size of the magnet in the first direction.

7. The magnetron according to claim 1, characterized in that, The notch is a rectangular hole.

8. The magnetron according to claim 1, characterized in that, Both the magnet and the die are in the shape of a cylinder.

9. The magnetron according to any one of claims 1-3 and 7, 8, characterized in that, The heat dissipation bracket is a square tube extending in the first direction, and the first direction, the second direction and the third direction are perpendicular to each other in pairs; And / or, the inner peripheral surface of the central hole abuts against the outer peripheral surface of the die; And / or, the two side edges of the heat sink in the third direction abut against the inner surfaces of the opposite side walls of the heat dissipation bracket.

10. The magnetron according to any one of claims 1-3 and 7, 8, characterized in that, The heat sink is provided with a first flanging on the periphery of the central hole, and the first flanging is sleeved on the outer peripheral surface of the die; Or, the heat sink is provided with second flangings on the two side edges in the third direction, and the second flangings abut against the inner side surface of the heat dissipation bracket; Or, the heat sink is provided with a first flanging on the periphery of the central hole, the first flanging is sleeved on the outer peripheral surface of the die, the heat sink is provided with second flangings on the two side edges in the third direction, the second flangings abut against the inner side surface of the heat dissipation bracket, and the first flanging and the second flanging extend towards the same side of the heat sink.

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