Magnetron

Abstract

The invention discloses a magnetron, which comprises: a heat dissipation channel extending in a first direction in a heat dissipation support; a tube core arranged in the heat dissipation support and extending in a second direction; a magnet arranged in the heat dissipation support and located at both ends of the tube core in the second direction, and the width of the magnet in the third direction is greater than the width of the tube core in the third direction; a plurality of heat dissipation fins, the heat dissipation fins having a central hole and the tube core passing through the central hole, the plurality of heat dissipation fins arranged in the second direction and gaps between adjacent heat dissipation fins, at least one of the two sides of the heat dissipation fins opposite to each other in the third direction is provided with a notch, and the notches of at least a part of the plurality of heat dissipation fins are opposite in the second direction, so as to be suitable for airflow to flow from both ends of the heat dissipation support to the middle along the second direction, the notch and the central hole are opposite in the third direction, and the first direction, the second direction and the third direction are perpendicular to each other. According to the magnetron of the invention, the overall heat dissipation effect can be improved.

Description

Technical Field

[0001] The invention belongs to the technical field of magnetrons, and in particular relates to a magnetron. Background Art

[0002] Magnetron, also known as Magnetron in English, was developed between 1936 and 1937 and was put into use in the market in 1939. It is a device that can generate microwave energy. The "magnetic" in magnetron refers to the magnetic field, and the "tube" refers to the diode. Therefore, "magnetron" is actually a process in which a diode is placed 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 from the electric field into microwave energy. Magnetrons have many characteristics such as low cost, small size, high power, and high efficiency, and are now widely used. Magnetrons are vacuum electron tubes that generate microwaves. Due to their high oscillation efficiency and high microwave output power, they are widely used as microwave generating sources for microwave application equipment such as household microwave ovens and industrial microwave heating equipment.

[0003] like 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 filter 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 generated by the anode tube of the tube core 1" is the largest. The outer periphery of the anode tube is covered with a plurality of heat sinks 21", which take out the heat of the anode tube and exchange heat with the cooling air. In the related art, the cooling air passes through the gap between two adjacent heat sinks, and the air intake in the gap between each heat sink is consistent. There is no airflow exchange between the heat sinks, and the heat dissipation efficiency and effect are poor. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, one object of the present invention is to provide a magnetron, which can improve the overall heat dissipation effect.

[0005] According to an embodiment of the present invention, a magnetron includes: a heat dissipation bracket, wherein the heat dissipation bracket has a heat dissipation channel extending along a first direction; a tube core, which is arranged in the heat dissipation bracket and extends along a second direction; a magnet, which is arranged in the heat dissipation bracket and located at both ends of the tube core in the second direction, and the width of the magnet in the third direction is greater than the width of the tube core in the third direction; a plurality of heat dissipation fins, wherein the heat dissipation fin has a central hole and the tube core passes through the central hole, the plurality of heat dissipation fins are arranged along the second direction and there are gaps between adjacent heat dissipation fins, at least one of the two sides of the heat dissipation fin that are opposite to each other along the third direction is provided with a notch, the notch passes through the heat dissipation fin along the second direction, and at least a part of the notches of the plurality of heat dissipation fins are opposite in the second direction, so as to be suitable for airflow to flow from the two ends of the heat dissipation bracket to the middle along the second direction, and the notch is opposite to the central hole in the third direction, wherein the first direction, the second direction and the third direction are perpendicular to each other.

[0006] According to the magnetron of the embodiment of the present invention, a notch is provided at least at one of two sides opposite to each other along the third direction on the heat sink, the notch penetrates the heat sink along the second direction, and the notches of at least a part of the plurality of heat sinks are opposite to each other in the second direction, so that the heat exchange between the airflow and the tube core can be improved, thereby better cooling the tube core, alleviating the temperature rise of the tube core, and ultimately alleviating the temperature rise of the magnetron.

[0007] According to some embodiments of the present invention, the dimension of the notch in the third direction is a≤(d33-d31) / 2, wherein d33 is the dimension of the heat dissipation channel in the third direction, and d31 is the dimension of the magnet in the third direction.

[0008] According to some embodiments of the present invention, a dimension b of the notch in the first direction is ≤ d11, where d11 is a dimension of the magnet in the first direction.

[0009] According to some embodiments of the present invention, the notch includes two sub-notches spaced apart along the first direction.

[0010] Optionally, the area between the two sub-notches is opposite to the axis of the tube core in the third direction.

[0011] Optionally, a dimension c of the sub-gap in the first direction is ≤ d11 / 2, wherein d11 is a dimension of the magnet in the first direction.

[0012] According to some embodiments of the present invention, the notch is a rectangular hole.

[0013] According to some embodiments of the present invention, both the magnet and the core are cylindrical in shape.

[0014] According to some embodiments of the present invention, the heat dissipation bracket is a square tube extending along the first direction; the inner circumference of the center hole is in contact with the outer circumference of the tube core; and the two side edges of the heat sink along the third direction are in contact with the inner surfaces of the opposite side walls of the heat dissipation bracket.

[0015] According to some embodiments of the present invention, the heat sink is provided with a first flange on the periphery of the center hole, and the first flange is sleeved on the outer peripheral surface of the tube core; the heat sink is provided with second flanges on both sides in the third direction, and the second flanges are abutted against the inner side surface of the heat dissipation bracket; the first flange and the second flange extend toward the same side of the heat sink.

[0016] 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

[0017] Figure 1 is a three-dimensional diagram of a magnetron according to an embodiment of the present invention;

[0018] Figure 2 Schematic diagram of a magnetron according to an embodiment of the present invention, wherein arrows indicate the direction of air flow inside the magnetron.

[0019] Figure 3 Schematic diagram of a magnetron according to an embodiment of the present invention, wherein arrows indicate the direction of air flow.

[0020] Figure 4 is a schematic cross-sectional view of a magnetron according to an embodiment of the present invention;

[0021] Figure 5 is a schematic diagram of a heat sink according to an embodiment of the present invention, wherein a notch is provided on the heat sink;

[0022] Figure 6 Schematic diagram of a heat sink according to another embodiment of the present invention, wherein two sub-notches are provided on each side of the heat sink.

[0023] Figure 7 It is a schematic diagram of the airflow of a magnetron in the prior art;

[0024] Figure 8 is a schematic diagram of air flow in a magnetron according to an embodiment of the present invention;

[0025] Reference numerals:

[0026] Magnetron 1000, tube core 1, anode tube 11, heat dissipation system 2, magnet 3, filter system 4, heat dissipation bracket 21, heat dissipation channel 212, heat sink 22, center hole 221, notch 222, sub-notch 2222, air flow channel 2224, first flange 224, second flange 226.

[0027] Figure 7 and Figure 8 The figure marks of the related art shown are: tube core 1", magnetic circuit system 3", filter system 4", heat sink 21", support bracket 22". DETAILED DESCRIPTION

[0028] 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 with 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 are not to be construed as limitations of the present invention. It should be understood that the various concepts and embodiments introduced above, as well as those concepts and implementations 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 implementation. In addition, some schemes disclosed in the present invention can be used alone, or used in any appropriate combination with other schemes disclosed in the present invention.

[0029] The following describes a magnetron 1000 according to an embodiment of the present invention with reference to the accompanying drawings.

[0030] Combination Figures 1 to 6 The magnetron 1000 according to the embodiment of the present invention comprises: a heat dissipation support 21 , a tube core 1 , a magnet 3 and a plurality of heat dissipation fins 22 .

[0031] Specifically, the heat dissipation support 21 has a heat dissipation channel 212 extending along the first direction AA, and the airflow flows through the heat dissipation channel 212; the tube core 1 is arranged in the heat dissipation support 21 and extends along the second direction BB. It should be noted that the tube core 1 is arranged in the heat dissipation channel 212, and the airflow flows through the heat dissipation channel 212 and exchanges heat with the tube core 1 to achieve heat dissipation of the tube core 1. The magnet 3 is arranged in the heat dissipation support 21 and is located at both ends of the tube core 1 in the second direction BB, and the width dimension of the magnet 3 in the third direction CC is greater than the width dimension of the tube core 1 in the third direction CC. It should be noted that the magnet 3 is arranged in the heat dissipation channel 212. The heat sink 22 has a central hole 221 and the tube core 1 passes through the central hole 221. The multiple heat sinks 22 are arranged along the second direction BB and there is a gap between adjacent heat sinks 22, wherein two adjacent heat sinks 22 among the multiple heat sinks 22 define a heat dissipation channel 212, and at least one of the two sides of the heat sink 22 that are opposite to each other along the third direction CC is provided with a notch 222, the notch 222 penetrates the heat sink 22 along the second direction BB, and the notches 222 of at least a part of the multiple heat sinks 22 are opposite in the second direction BB, so as to be suitable for airflow to flow from both ends to the middle of the heat sink bracket 21 along the second direction BB, and the notch 222 is opposite to the central hole 221 in the third direction CC, wherein the first direction AA, the second direction BB and the third direction CC are perpendicular to each other.

[0032] It can be understood that the airflow flows in the heat dissipation channel 212 and cools down and dissipates the heat of the tube core 1. Since the width dimension of the magnet 3 in the third direction CC is larger than the width dimension of the tube core 1 in the third direction CC, 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 tube core 1. The air pressure near the magnet 3 is higher than the air pressure near the tube core 1. According to the principle that the airflow flows from a place with high air pressure to a place with low air pressure, since the magnet 3 and the tube core 1 are arranged along the second direction BB, the airflow passing near the magnet 3 will flow along the second direction BB toward the vicinity of the tube core 1. Since the notches 222 of at least a part of the multiple heat sinks 22 are opposite in the second direction BB, these notches 222 form an airflow channel 2224 along the second direction BB, and the airflow flows from the vicinity of the magnet 3 to the vicinity of the tube core 1 via the airflow channel 2224, thereby enabling the airflow to flow and exchange heat in the heat dissipation bracket 21 better, thereby better dissipating the heat of the tube core 1. In addition, the position near the middle of the tube core 1 is generally the position of the heat source, where the temperature is the highest. The airflow near the magnets 3 at both ends of the tube core 1 flows toward the position near the tube core 1, which can make the airflow better converge to the position near the middle of the tube core 1. According to the formula q=hA△T, q is the heat transfer amount, h is the heat transfer coefficient, A is the heat dissipation area, △T is the temperature difference between the airflow and the solid wall, the airflow near the magnets 3 at both ends of the tube core 1 flows toward the position near the tube core 1 to increase the temperature difference △T. It can be seen from Newton's cooling law that the increase in temperature difference △T can increase the heat transfer coefficient h. In this way, the heat exchange amount between the airflow and the tube core 1 is ultimately increased, thereby better cooling the tube core 1, alleviating the temperature rise of the tube core 1, and ultimately alleviating the temperature rise of the magnetron 1000.

[0033] According to the magnetron 1000 of the embodiment of the present invention, a notch 222 is provided on at least one of the two sides opposite to each other along the third direction CC on the heat sink 22, the notch 222 penetrates the heat sink 22 along the second direction BB, and the notches 222 of at least a part of the plurality of heat sinks 22 are opposite to each other in the second direction BB, so that the heat exchange between the airflow and the tube core 1 can be improved, thereby better cooling the tube core 1, alleviating the temperature rise of the tube core 1, and finally alleviating the temperature rise of the magnetron 1000.

[0034] Specifically, combined Figure 2, magnets 3 are provided at both ends of the heat dissipation bracket 21 along the second direction BB. Thus, when the airflow flows through the magnets 3, due to the aforementioned pressure imbalance, that is, the air pressure at the two magnets 3 is greater than the air pressure around the tube core 1 due to the small flow area, a part of the airflow at both ends of the heat dissipation bracket 21 along the third direction CC will flow downward, thereby promoting more airflow to cool the tube core 1, that is, to concentrate the cooling of the area with relatively large heat generation in the magnetron 1000, effectively improving the efficiency and effect of heat dissipation. Figure 3 FIG. 1 shows a flow path of heat dissipation airflow in a magnetron 1000 according to an embodiment of the present invention.

[0035] Optionally, combined Figures 4 to 6 A rectangular long hole is left at the middle contact point between the heat sink 22 and the heat sink bracket 21.

[0036] Combination Figures 4 to 6 According to some embodiments of the present invention, the dimension of the notch 222 in the third direction CC is a≤(d33-d31) / 2, wherein d33 is the dimension of the heat dissipation channel 212 in the third direction CC, and d31 is the dimension of the magnet 3 in the third direction CC, that is, the width of the notch 222 in the third direction CC 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. Thus, the dimension of the notch 222 in the third direction CC can be made more reasonable, and the area of ​​the heat sink 22 can be made reasonable, so that the advantages of the notch 222 in allowing the airflow to dissipate heat to the tube core 1 and the advantages of the airflow in passing through the heat sink 22 can be combined, so that the heat exchange effect between the tube core 1 and the airflow is better, so that the temperature rise of the magnetron 1000 can be better alleviated.

[0037] Combination Figures 4 to 5 According to some embodiments of the present invention, the dimension b of the notch 222 in the first direction AA is less than or equal to d11, where d11 is the dimension of the magnet 3 in the first direction AA. Optionally, if the magnet 3 is cylindrical, the dimension of the notch 222 in the first direction AA is smaller than the diameter of the magnet 3. Thus, the dimension of the notch 222 in the first direction AA can be made more reasonable, and the area of ​​the heat sink 22 can be made reasonable, so that the advantages of the notch 222 in allowing the airflow to dissipate heat for the tube core 1 and the advantages of the airflow in passing through the heat sink 22 can be combined, so that the heat exchange effect between the tube core 1 and the airflow is better, so that the temperature rise of the magnetron 1000 can be better alleviated.

[0038] Preferably, in consideration of manufacturability and the supporting effect of the heat dissipation bracket 21 on the heat dissipation fin 22 , two long holes are left at the contact point between the heat dissipation fin 22 and the heat dissipation bracket 21 .

[0039] like 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 AA. The portion of the heat sink 22 located between the two sub-notches 2222 can be connected to the heat sink bracket 21, thereby increasing the support strength of the heat sink 22, thereby improving the overall structural strength of the heat sink 22.

[0040] Optionally, the area between the two sub-gaps 2222 is opposite to the axis of the tube core 1 in the third direction CC, thereby enabling the airflow passing through the two sub-gaps 2222 to flow through the tube core 1 better, thereby better exchanging heat with the tube core 1 .

[0041] like Figure 6 As shown, optionally, the dimension c of the sub-notch 2222 in the first direction AA is ≤ d11 / 2, wherein d11 is the dimension of the magnet 3 in the first direction AA, wherein the magnet 3 may be cylindrical, and therefore, the length dimension c of the sub-notch 2222 in the first direction AA is not greater than the radius of the magnet 3. Thus, the dimension of the sub-notch 2222 in the first direction AA can be more reasonable, and the area of ​​the heat sink 22 can be reasonable, so that the advantages of the sub-notch 2222 in allowing the airflow to dissipate heat for the tube core 1 and the advantages of the airflow in passing through the heat sink 22 can be combined, so that the heat exchange effect between the tube core 1 and the airflow is better, so that the temperature rise of the magnetron 1000 can be better alleviated.

[0042] According to some embodiments of the present invention, the notch 222 is a rectangular hole. Since the notches 222 of at least a portion of the plurality of heat sinks 22 are opposite to each other in the second direction BB, the notches 222 define a rectangular airflow channel 2224 along the second direction BB, which enables the airflow to flow more easily from a position close to the magnet 3 to a position close to the tube core 1, thereby improving the heat exchange effect of the rectangular airflow channel 2224, thereby further improving the heat exchange rate between the airflow and the tube core 1, thereby better cooling the tube core 1, alleviating the temperature rise of the tube core 1, and ultimately alleviating the temperature rise of the magnetron 1000.

[0043] In addition, the rectangular hole in the present application is formed by the notch 222 and the inner surface of the heat dissipation bracket 21. Therefore, when the heat dissipation airflow passes through the heat dissipation channel 212, under the action of the air pressure difference, the airflow will flow along the inner surface of the heat dissipation bracket 21 in a third direction, thereby improving the circulation effect of the airflow and thus improving the heat dissipation effect of the tube core 1.

[0044] According to some embodiments of the present invention, the magnet 3 and the tube core 1 are both cylindrical in shape, which makes the magnet 3 and the tube core 1 simple in structure, convenient in production and assembly, and can simplify the process flow.

[0045] According to some embodiments of the present invention, the heat dissipation bracket 21 is a square tube extending along the first direction AA, so that the heat dissipation bracket 21 is easy and convenient to process and the processing flow is simplified. The inner circumference of the center hole 221 is against the outer circumference of the tube core 1; the two sides of the heat sink 22 along the third direction CC are against the inner surfaces of the two opposite side walls of the heat dissipation bracket 21.

[0046] like Figure 5-Figure 6 As shown, according to some embodiments of the present invention, the heat sink 22 is provided with a first flange 224 on the periphery of the center hole 221, and the first flange 224 is sleeved on the outer peripheral surface of the tube core 1, so that the heat sink 22 is supported by the tube core 1 on the first flange 224, so that the installation of the heat sink 22 in the heat dissipation bracket 21 is more stable.

[0047] Combination Figure 3 , Figure 5 and Figure 6 It can be seen that the first flange 224 can be interference fit with the tube core 1, so that the heat of the tube core 1 is transferred to the heat sink 22 more and faster. When the airflow passes through the heat sink 22, the heat can be taken away, thereby effectively improving the heat dissipation effect of the tube core 1.

[0048] Alternatively, if Figure 5 and Figure 6 The heat sink 22 is provided with second flanges 226 on both sides in the third direction CC, and the second flanges 226 are close to the inner side of the heat sink bracket 21; thereby, the heat sink 22 is supported by the heat sink bracket 21 on the second flanges 226, so that the heat sink 22 is installed more stably in the heat sink bracket 21.

[0049] In addition, the second flange 226 provided on the heat sink 22 can not only improve the stable fit between the heat sink 22 and the heat sink bracket 21, but also effectively increase the contact area between the heat sink structure (heat sink 22, heat sink bracket 21, etc.) and the heat sink airflow, thereby improving the heat dissipation effect of the magnetron 1000.

[0050] Optionally, the first flange 224 and the second flange 226 extend toward the same side of the heat sink 22. This makes it easier to install the heat sink 22 and improves the installation efficiency of the heat sink 22.

[0051] In addition, a first flange 224 and a second flange 226 are provided on the plurality of heat sinks 22 arranged at intervals along the second direction BB, and the first flange 224 and the second flange 226 of each heat sink 22 extend in the same direction, and the first flange 224 and the second flange 226 on the plurality of heat sinks 22 extend in the same direction.

[0052] The present invention provides rectangular holes through which air can pass at the contact point between the heat sink 22 and the heat dissipation bracket 21, so that the cooling wind at the upper and lower ends of the magnetron 1000 is concentrated to the middle part of the magnetron 1000 where the temperature is highest, thereby 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, thereby enhancing the performance stability of the magnetron 1000 and extending the service life.

[0053] 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 CC.

[0054] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do 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. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0055] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A magnetron, characterized in that: include: A heat dissipation bracket, wherein the heat dissipation bracket has a heat dissipation channel extending along a first direction; A tube core, the tube core is arranged in the heat dissipation bracket and extends along the second direction; A magnet, wherein the magnet is disposed in the heat dissipation bracket and is located at two ends of the tube core in the second direction, and the width of the magnet in the third direction is greater than the width of the tube core in the third direction; A plurality of heat sinks, each heat sink having a central hole and the tube core passing through the central hole, the plurality of heat sinks are arranged along a second direction and there is a gap between adjacent heat sinks, at least one of the two sides of the heat sink that are opposite to each other along a third direction is provided with a notch, the notch passes through the heat sink along the second direction, and at least a part of the notches of the plurality of heat sinks are opposite in the second direction, so as to be suitable for airflow to flow from both ends of the heat sink to the middle along the second direction, and the notch is opposite to the central hole in the third direction, Wherein, the first direction, the second direction and the third direction are perpendicular to each other; The dimension of the notch in the third direction is a≤(d33-d31) / 2, wherein d33 is the dimension of the heat dissipation channel in the third direction, and d31 is the dimension of the magnet in the third direction; The dimension b of the notch in the first direction is ≤ d11, where d11 is the dimension of the magnet in the first direction.

2. The magnetron according to claim 1, characterized in that: The notch includes two sub-notches spaced apart along a first direction.

3. The magnetron according to claim 2, characterized in that: The area between the two sub-notches is opposite to the axis of the tube core in the third direction.

4. The magnetron according to claim 3, characterized in that: The dimension c of the sub-gap in the first direction is ≤ d11 / 2, wherein d11 is the dimension of the magnet in the first direction.

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

6. The magnetron according to claim 1, characterized in that: The magnet and the tube core are both in cylindrical shape.

7. The magnetron according to any one of claims 1, 5 and 6, characterized in that: The heat dissipation bracket is a square tube extending along the first direction; The inner circumference of the central hole is in contact with the outer circumference of the tube core; The two side edges of the heat sink along the third direction are pressed against the inner surfaces of the two side walls opposite to the heat sink bracket.

8. The magnetron according to any one of claims 1, 5 and 6, characterized in that: The heat sink is provided with a first flange at the periphery of the central hole, and the first flange is sleeved on the outer peripheral surface of the tube core; The heat sink is provided with second flanges on both sides in the third direction, and the second flanges are close to the inner side surface of the heat dissipation bracket; The first flange and the second flange extend toward the same side of the heat sink.

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