Heat dissipation structure of magnetron, magnetron assembly and microwave cooking utensil

Abstract

The utility model provides a heat dissipation structure of a magnetron, a magnetron assembly and a microwave cooking utensil. The heat dissipation structure of the magnetron comprises a mounting bracket, an air guide structure and a heat dissipation fan, the mounting bracket forms a mounting cavity with an opening, and the mounting cavity is used for mounting the magnetron; an air duct is formed in the air guide structure, and an airflow outlet of the air duct is communicated with the opening of the mounting cavity; at least 80% of the opening area of the air outlet of the cooling fan is opposite to the airflow inlet of the air duct. According to the technical scheme, the heat dissipation efficiency of the magnetron can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of magnetrons, and particularly relates to a heat dissipation structure of a magnetron, a magnetron assembly and a microwave cooking appliance. Background Art

[0002] A magnetron is a vacuum electron tube that generates microwaves. Due to its high oscillation efficiency, large microwave output power and other characteristics, it is widely used as a microwave generation source for microwave devices such as household microwave ovens and industrial microwave heating equipment.

[0003] To increase the heat dissipation of the magnetron, a heat dissipation fan is configured inside the microwave application device. However, a part of the cooling air flow blown by the heat dissipation fan will dissipate to the surroundings and not flow through the magnetron, affecting the heat dissipation of the magnetron. Summary of the Utility Model

[0004] The main purpose of the utility model is to provide a heat dissipation structure of a magnetron, a magnetron assembly and a microwave cooking appliance applying the heat dissipation structure, aiming to improve the heat dissipation efficiency of the magnetron.

[0005] To achieve the above purpose, a heat dissipation structure of a magnetron proposed by the utility model includes:

[0006] A mounting bracket, the mounting bracket forms a mounting cavity with an opening, and the mounting cavity is used for mounting the magnetron;

[0007] An air guiding structure, the air guiding structure forms an air duct, and an air flow outlet of the air duct is communicated with the opening of the mounting cavity; and

[0008] A heat dissipation fan, at least 80% of the opening area of the air outlet of the heat dissipation fan is oppositely arranged with the air flow inlet of the air duct.

[0009] In an embodiment of the present application, at least 80% of the opening area of the air flow outlet is oppositely arranged with the opening of the mounting bracket.

[0010] In an embodiment of the present application, the heat dissipation structure further includes a plurality of heat dissipation fins that are stacked and spaced in the mounting cavity. The arrangement direction of the plurality of heat dissipation fins forms an angle with the air flow direction at the opening of the mounting bracket, and the heat dissipation fins are provided with mounting holes for passing through the magnetron.

[0011] In an embodiment of the present application, the air flow outlet is spaced from the heat dissipation fins.

[0012] In an embodiment of the present application, the distance D between the air flow outlet and the heat dissipation fins satisfies 2mm ≤ D ≤ 5mm.

[0013] In an embodiment of the present application, the air duct is arranged to be constricted in the direction from the air inlet to the air outlet.

[0014] In an embodiment of the present application, the cooling fan includes a fan bracket and fan blades. The fan bracket forms a blowing cavity and is provided with an air inlet and an air outlet communicating with the blowing cavity. The fan blades are rotatably arranged in the blowing cavity.

[0015] In an embodiment of the present application, the air guiding structure is integrally formed with the fan bracket;

[0016] Or, the air guiding structure is connected to the fan bracket.

[0017] In an embodiment of the present application, the cooling fan is an axial flow fan.

[0018] The present application also provides a magnetron assembly, including a magnetron and the heat dissipation structure as described in any of the foregoing embodiments. The magnetron is arranged in the installation cavity.

[0019] The present application also provides a microwave cooking appliance, including the magnetron assembly as described in the foregoing embodiment.

[0020] In some embodiments, the microwave cooking appliance includes a cooking pot body and a lid. The cooking pot body forms a heating cavity with an open top. The lid is pivotally arranged to cover the opening of the heating cavity. The magnetron of the magnetron assembly can emit microwaves into the heating cavity.

[0021] In the technical solution of the present utility model, in the heat dissipation structure for dissipating heat from the magnetron, an air guiding structure is arranged between the magnetron area and the cooling fan. The air guiding structure forms an air duct communicating the magnetron installation cavity and the cooling fan, and at least 80% of the air outlet area of the cooling fan is arranged opposite to the air inlet of the air duct. Preferably, the air outlet of the cooling fan can completely fall within the air inlet area of the air duct; with such an arrangement, most of the air flow blown out by the cooling fan is guided through the air duct structure formed by the air guiding structure to restrict the air flow direction, so that most of the air flow blown out by the cooling fan can flow through the air duct to the installation cavity to exchange heat with the magnetron, which can preferably improve the utilization rate of the low-temperature air flow blown out by the cooling fan, thereby improving the heat dissipation efficiency of the magnetron. Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0023] Figure 1 Structural diagram of an embodiment of the microwave cooking appliance of the present application;

[0024] Figure 2 is Figure 1 an enlarged view of location A in

[0025] Figure 3 is Figure 1 a cross-sectional view of the microwave cooking appliance in

[0026] Figure 4 a cross-sectional view of an embodiment of the magnetron assembly of the present application;

[0027] Figure 5 Structural diagram of an embodiment of the air guiding structure in the heat dissipation structure of the magnetron of the present application.

[0028] Explanation of the reference numerals in the drawings:

[0029] Label Name Label Name 1 Microwave cooking appliance 333 Air flow outlet 100 Magnetron assembly 335 Air flow inlet 10 Magnetron 35 Heat dissipation fan 30 Heat dissipation structure 351 Fan bracket 31 Installation bracket 353 Fan blade 311 Installation cavity 355 Air outlet 33 Air guiding structure 37 Heat dissipation fin 331 Air duct 200 Appliance body

[0030] The realization of the object, functional features and advantages of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0031] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0032] It should be noted that all directional indications (such as up, down, left, right, front, back,...) in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0033] In the present utility model, unless otherwise clearly defined and limited, the terms "connection", "fixation", etc. shall be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the internal connection of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0034] In addition, in the present utility model, descriptions such as "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments may be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0035] The present utility model provides a heat dissipation structure 30, which can be used to dissipate heat from the magnetron 10.

[0036] With reference to Figures 1 to 4 , in some embodiments of the present application, the heat dissipation structure 30 of the magnetron 10 includes a mounting bracket 31, a wind guiding structure 33, and a heat dissipation fan 35. The mounting bracket 31 forms a mounting cavity 311 with an opening, and the mounting cavity 311 is used to mount the magnetron 10; the wind guiding structure 33 forms a wind duct 331, and the air flow outlet 333 of the wind duct 331 is communicated with the opening of the mounting cavity 311; the air outlet 355 of the heat dissipation fan 35 is disposed opposite to the air flow inlet 335 of the wind duct 331. For example, in some embodiments, at least 80% of the opening area of the air outlet 355 of the heat dissipation fan 35 is disposed opposite to the air flow inlet 335 of the wind duct 331.

[0037] The heat dissipation structure 30 proposed in the embodiments of the present application can be applied to microwave cooking appliances 1 such as microwave ovens and microwave rice cookers to dissipate heat from the magnetron 10. Among them, the heat dissipation structure 30 has a mounting bracket 31 for mounting the magnetron 10. The mounting bracket 31 can be a frame structure, forming a mounting cavity 311 that penetrates through both ends; the mounting bracket 31 can also be a housing structure, and an opening communicating with the mounting cavity 311 is provided on the housing as an air inlet, and an air outlet can be opened on any other surface of the housing; the wind guiding structure 33 is generally a cylindrical structure or a cover structure. A wind duct 331 is formed inside the wind guiding structure 33. The air flow outlet 333 of the wind duct 331 is communicated with the air inlet of the mounting cavity 311, and the air flow inlet 335 of the wind duct 331 is communicated with the air outlet 355 of the heat dissipation fan 35. With such a setting, the air flow blown out by the heat dissipation fan 35 and flowing into the wind duct 331 can be restricted in its flow direction by the wind duct 331 to fully flow into the mounting cavity 311 to dissipate heat from the magnetron 10. Among them, the heat dissipation fan 35 can be a centrifugal fan or an axial flow fan.

[0038] At the same time, in some embodiments of the present application, it is required that at least 80% of the air outlet 355 area of the heat dissipation fan 35 is disposed opposite to the air flow inlet 335 of the wind duct 331; in other words, as Figure 4As shown in the figure, if the projection area of the air outlet 355 of the cooling fan 35 in the air flow direction is defined as S1, and the projection area of the air inlet 335 of the air duct 331 in the air flow direction is defined as S2, in the embodiment of the present application, it is required that at least 80% of the projection S1 of the air outlet 355 of the cooling fan 35 in the air flow direction overlaps with the projection S2 on the same side of the air inlet 335 of the air duct 331; with such a setting, most of the air flow blown out by the cooling fan 35 can flow into the air duct 331, so as to ensure that most of the air flow blown out by the cooling fan 35 can flow along the air duct 331 to the installation cavity 311 to dissipate heat from the magnetron 10. Among them, it can be that the air inlet 335 is slightly larger than the air outlet 355, or the air inlet 335 is slightly smaller than the air outlet 355 but not less than 80% of the projected area of the air outlet 355, or the air outlet 355 is completely adapted to the air inlet 335, which is not limited here. It can be understood that when the overlap rate of the projections of the air inlet 335 and the air outlet 355 in the air flow direction is as high as 100%, it is equivalent to that the projection of the air outlet 355 of the cooling fan 35 completely falls within the air inlet 335 of the air duct 331. At this time, the air guiding structure 33 has a better limiting effect on the air flow blown out by the cooling fan 35, and the air flow utilization rate is the highest, so that the heat dissipation efficiency of the magnetron 10 can be better improved.

[0039] It should be noted that in some embodiments, the cooling fan 35 can be connected to the air guiding structure 33 to reduce the gap between the air outlet 355 and the air inlet 335, thereby reducing air leakage. Similarly, the air guiding structure 33 can be connected to the mounting bracket 31 to avoid gaps between the air duct 331 and the installation cavity 311, reduce air leakage, and improve air flow utilization rate; at this time, in order to avoid the influence of the high temperature of the magnetron 10 in the installation cavity 311 on the air guiding structure 33, the air guiding structure 33 can be made of a material with higher heat resistance to improve the use safety and performance stability. In some embodiments, in order to avoid the influence of the high temperature of the magnetron 10 in the installation cavity 311 on the air guiding structure 33, the mounting bracket 31 and the air guiding structure 33 can also be arranged at intervals. The specific implementation method is referred to below and will not be elaborated here.

[0040] Therefore, it can be understood that in the heat dissipation structure 30 for dissipating heat from the magnetron 10 in the technical solution of the present application, a wind guiding structure 33 is provided between the magnetron 10 area and the heat dissipation fan 35. The wind guiding structure 33 forms a wind channel 331 communicating the installation cavity 311 of the magnetron 10 and the heat dissipation fan 35, and at least 80% of the air outlet 355 area of the heat dissipation fan 35 is disposed opposite to the air inlet 335 of the wind channel 331. Preferably, the air outlet 355 of the heat dissipation fan 35 can be completely located within the air inlet 335 area of the wind channel 331. With such a setting, most of the air flow blown out by the heat dissipation fan 35 is guided through the wind channel 331 structure formed by the wind guiding structure 33 to restrict the air flow direction, so that most of the air flow blown out by the heat dissipation fan 35 can flow through the wind channel 331 to exchange heat with the magnetron 10 in the installation cavity 311, improving the utilization rate of the low-temperature air flow blown out by the heat dissipation fan 35, and thus improving the heat dissipation efficiency of the magnetron 10.

[0041] Please refer to Figure 4 , in some embodiments of the present application, at least 80% of the opening area of the air outlet 333 is disposed opposite to the opening of the mounting bracket 31.

[0042] In this embodiment, at least 80% of the air outlet 333 area of the wind guiding structure 33 is disposed opposite to the opening of the installation cavity 311; as Figure 4 shown, if the projection area of the air outlet 333 of the wind channel 331 in the air flow direction is defined as S3, and the projection area of the opening of the installation cavity 311 in the air flow direction is defined as S4, that is, at least 80% of the projection S3 of the air outlet 333 of the wind channel 331 in the air flow direction overlaps with the projection S4 on the same side of the opening of the installation cavity 311; with such a setting, most of the air flow flowing out through the wind channel 331 can flow into the installation cavity 311 to dissipate heat from the magnetron 10. It can be understood that when the overlap rate of the projections of the air outlet 333 and the opening of the installation cavity 311 in the air flow direction is higher up to 100%, it is equivalent to that the projection of the air outlet 333 of the wind channel 331 completely falls within the opening of the installation cavity 311, and at this time the air flow utilization rate is the highest, which can preferably improve the heat dissipation efficiency of the magnetron 10.

[0043] With reference to Figure 2 and Figure 4 , in some embodiments of the present application, the heat dissipation structure 30 further includes a plurality of stacked and spaced heat dissipation fins 37 disposed in the installation cavity 311. The arrangement direction of the plurality of heat dissipation fins 37 forms an angle with the air flow direction at the opening of the mounting bracket 31, and the heat dissipation fins 37 are provided with mounting holes for passing through the magnetron 10.

[0044] In this embodiment, a plurality of stacked and spaced heat dissipation fins 37 are further provided in the installation cavity 311 of the installation bracket 31. The heat dissipation fins 37 are provided with through installation holes, and the installation holes of each heat dissipation fin 37 are oppositely arranged and communicated with each other. In this way, when the magnetron 10 is installed in the installation cavity 311, it passes through the installation holes of each heat dissipation fin 37, so that the heat generated when the magnetron 10 works can be transferred to each heat dissipation fin 37, increasing the heat dissipation area and improving the heat dissipation efficiency. And a ventilation gap is formed by the spaced arrangement between two adjacent heat dissipation fins 37, so that the low-temperature air flow blown into the installation cavity 311 can flow through the surfaces of each heat dissipation fin 37 and take away the heat of the heat dissipation fin 37 and the magnetron 10, improving the heat dissipation efficiency.

[0045] Please refer to Figure 4 , in some embodiments of the present application, the air flow outlet 333 is spaced from the heat dissipation fin 37.

[0046] Since the heat of the magnetic surface end face of the magnetron 10 is relatively high (120°C to 150°C) when the magnetron 10 is working, if the air guiding structure 33 is close to the magnetron 10, the temperature of the air guiding structure 33 close to the magnetron 10 will also rise to a relatively high level. Among them, the magnetic surface end face of the magnetron 10 can be the outer surface of the magnetron 10. In some embodiments, heat dissipation fins 37 are arranged around the outer surface of the magnetron 10. At this time, the magnetic surface end face of the magnetron 10 can also be the outer edge of the heat dissipation fin 37. In this embodiment, the air guiding structure 33 can be spaced from the heat dissipation fin 37 to prevent the high temperature during the operation of the magnetron 10 from being conducted to the air guiding structure 33 through the heat dissipation fin 37, so as to avoid the overheating of the air guiding structure 33. In this way, the temperature resistance requirement of the manufacturing material for the air guiding structure 33 can be appropriately reduced, and more types of materials can be used to manufacture the air guiding structure 33; when the air guiding structure 33 is made of a material with slightly weaker temperature resistance, since the air guiding structure 33 is spaced from the magnetic surface end face of the magnetron 10, the risk of the air guiding structure 33 melting due to high temperature can also be reduced, improving the use safety.

[0047] Please refer to Figure 4 , in some embodiments of the present application, the distance D between the air flow outlet 333 and the heat dissipation fin 37 satisfies 2mm ≤ D ≤ 5mm.

[0048] Among them, the distance D between the air guiding structure 33 and the heat dissipation fins 37 can take values of 2mm, 2.2mm, 2.5mm, 2.8mm, 3mm, 3.2mm, 3.5mm, 4mm, 4.5mm, 5mm, and any value between 2mm and 5mm. It can be understood that in the circumferential direction of the air flow outlet 333, the distances between the air guiding structure 33 and different positions of the mounting bracket 31 can be the same or different, and only the distance D at at least some positions needs to satisfy 2mm ≤ D ≤ 5mm. If the distance between the air guiding structure 33 and the heat dissipation fins 37 is less than 2mm, the distance between the air guiding structure 33 and the heat dissipation fins 37 is relatively close, and the effect of hindering heat transfer is relatively weak, and there is still a high risk that the air guiding structure 33 will have too high a temperature rise due to heat transfer from the heat dissipation fins 37. If the distance between the air guiding structure 33 and the heat dissipation fins 37 exceeds 5mm, at this time, there will be a large gap between the air flow outlet 333 of the air guiding structure 33 and the opening of the mounting bracket 31, which is likely to cause a large amount of air leakage and affect the air utilization rate, thereby affecting the heat dissipation efficiency of the magnetron 10. Setting the distance D between the air guiding structure 33 and the magnetic surface end face of the magnetron 10 within the range of 2mm to 5mm can not only effectively reduce the influence of the high temperature of the magnetron 10 on the air guiding structure 33, but also avoid serious air leakage problems between the air guiding structure 33 and the mounting bracket 31, improve the air utilization rate while improving the use safety, and can maintain a high heat dissipation efficiency for the magnetron 10 and ensure stable performance.

[0049] Please refer to Figure 4 and Figure 5 , in some embodiments of the present application, the air duct 331 is arranged in a contracting manner from the air flow inlet 335 to the air flow outlet 333.

[0050] In the embodiments of the present application, the air guiding structure 33 is used to form the air duct 331 to limit the flow direction of the air flow blown out by the heat dissipation fan 35, so as to improve the air utilization rate and make more air flow blow to the magnetron 10 to dissipate heat and cool down the magnetron 10. When the opening of the installation cavity 311 of the mounting bracket 31 is slightly smaller than the air outlet 355 of the heat dissipation fan 35, the air duct 331 can be arranged in a contracting manner from the air flow inlet 335 to the air flow outlet 333, so as to ensure good connection and cooperation relationships between the air flow inlet 335 of the air duct 331 and the air outlet 355 of the heat dissipation fan 35 and between the air flow outlet 333 and the opening of the installation cavity 311, thereby avoiding more air leakage problems at the air flow inlet 335 or the air flow outlet 333, for example, avoiding that part of the air flow flowing out of the air flow outlet 333 cannot enter the installation cavity 311 due to the air flow outlet 333 being larger than the opening of the installation cavity 311; in addition, the contracting air duct 331 can also increase the air flow velocity and improve the heat dissipation efficiency of the magnetron 10.

[0051] Among them, between the air inlet 335 and the air outlet 355 of the heat dissipation fan 35, it is satisfied that at least 80% of the area of the air outlet 355 faces the air inlet 335. The air outlet 333 and the opening of the installation cavity 311 are substantially adapted, and it can also be satisfied in some embodiments that at least 80% of the area of the air outlet 333 faces the opening of the installation cavity 311.

[0052] Please refer to Figure 4 , in some embodiments of the present application, the heat dissipation fan 35 includes a fan bracket 351 and fan blades 353. The fan bracket 351 forms a blowing cavity, and is provided with an air inlet and an air outlet 355 communicating with the blowing cavity. The fan blades 353 are rotatably arranged in the blowing cavity.

[0053] In this embodiment, the heat dissipation fan 35 includes a fan bracket 351 and fan blades 353. Among them, the fan bracket 351 serves as the installation base of the heat dissipation fan 35, and can be used to carry the fan blades 353 and the driving structure, etc. The heat dissipation fan 35 can also be installed and fixed by fixing the fan bracket 351. Among them, the heat dissipation fan 35 can be a centrifugal fan or an axial flow fan. When the heat dissipation fan 35 is a centrifugal fan, the fan bracket 351 is arranged as a volute structure; when the heat dissipation fan 35 is an axial flow fan, the fan bracket 351 is generally a frame structure with both ends penetrating. The fan blades 353 of the heat dissipation fan 35 are arranged in the blowing cavity of the fan bracket 351. It can be understood that a driving structure is usually arranged in the heat dissipation fan 35 to drive the fan blades 353 to rotate. An electric motor can be set as the driving structure, and the fan blades 353 are connected to the output shaft of the electric motor, so as to drive the fan blades 353 to rotate by driving the output shaft to rotate, thereby guiding the air flow to enter the blowing cavity from the air inlet and then blowing out from the air outlet 355.

[0054] In some embodiments of the present application, the air guiding structure 33 and the fan bracket 351 are integrally formed. With such a setting, it is convenient to make the air outlet 355 of the heat dissipation fan 35 completely face the air inlet 335 of the air guiding structure 33, and there is no gap between the air outlet 355 and the air inlet 335, so that the air flow blown out by the heat dissipation fan 35 can fully flow into the air guiding structure 33, reducing air leakage and improving air flow utilization rate. Moreover, the air guiding structure 33 and the heat dissipation fan 35 are stably and effectively matched, improving the reliability of their cooperation and the overall structural stability.

[0055] In some embodiments of the present application, the air guiding structure 33 is connected to the fan bracket 351. With such an arrangement, the air guiding structure 33 and the cooling fan 35 can be stably and effectively coordinated, reducing the risk of displacement and misalignment of the air outlet 355 of the cooling fan 35 and the air inlet 335 of the air guiding structure 33 under external forces, improving the reliability of their cooperation and the overall structural stability, ensuring a good connection relationship between the air outlet 355 of the cooling fan 35 and the air inlet 335 of the air guiding structure 33, so that most of the air flow blown out by the cooling fan 35 can flow into the air duct 331 of the air guiding structure 33 and be guided to the installation cavity 311 for cooling the magnetron 10, thereby improving the cooling efficiency.

[0056] Please refer to Figure 4 , in some embodiments of the present application, the cooling fan 35 is an axial flow fan. The axial flow fan is small in size, which can reduce the volume of the heat dissipation structure 30; in addition, the air flow driven by the axial flow fan is relatively large, and the noise is relatively small, which can avoid generating excessive noise while improving the cooling efficiency and enhancing the user experience.

[0057] Please refer to Figure 4 , the present application also proposes a magnetron assembly 100, which includes a magnetron 10 and a heat dissipation structure 30 as described in any of the foregoing embodiments. The specific structure of the heat dissipation structure 30 refers to any of the foregoing embodiments. The magnetron 10 is located in the installation cavity 311 formed by the installation bracket 31. Most of the air flow blown out by the cooling fan 35 can flow through the air duct 331 into the installation cavity 311 to exchange heat with the magnetron 10, improving the utilization rate of the low-temperature air flow blown out by the cooling fan 35, thereby enhancing the heat dissipation efficiency of the magnetron 10.

[0058] Since the magnetron assembly 100 proposed in the present application applies all the technical solutions of any of the foregoing embodiments, it has at least all the beneficial effects brought by all the foregoing technical solutions, which will not be elaborated herein one by one.

[0059] Please refer to Figure 1 and Figure 3 , the present application also proposes a microwave cooking appliance 1, which includes a magnetron assembly 100 as described in any of the foregoing embodiments. The microwave cooking appliance 1 can be a microwave oven, a microwave rice cooker, and other cooking devices provided with a magnetron 10 to generate microwaves for heating. The microwave cooking appliance 1 generally includes an appliance main body 200 and a magnetron assembly 100. The cooking main body forms a cooking cavity, and the magnetron assembly 100 is provided in the cooking main body. The specific structure of the magnetron assembly 100 refers to the foregoing embodiments; the magnetron assembly 100 can generate microwaves, and can use structures such as a waveguide to transmit the microwaves to the cooking cavity for heating food.

[0060] Since the microwave cooking device 1 proposed in the present application applies all the technical solutions of any of the aforementioned embodiments, it at least has all the beneficial effects brought by all the aforementioned technical solutions, which will not be described one by one here.

[0061] In some embodiments of the present application, the microwave cooking device 1 includes a pot body and a cover body, the pot body forms a heating cavity with a top opening, the cover body can be opened and closed to cover the opening of the heating cavity, and the magnetron of the magnetron assembly 100 can emit microwaves into the heating cavity.

[0062] In this embodiment, when the microwave cooking device 1 is a microwave rice cooker, the microwave heating principle can be used to achieve rice cooking functions such as cooking rice, soup, and porridge. The device body 200 includes a cooker body and a cover body. The cooker body forms a heating cavity with an open top. The heating cavity can be used to directly hold food, or an inner pot can be set in the heating cavity. Microwaves can pass through the inner pot to heat the food placed in the inner pot; further, a shielding shell can be set in the cooker body to form the heating cavity. The shielding shell can be made of metal material or metal-based composite material, and at least the area on the cover body that is covered by the shielding shell is made of a material with microwave shielding properties, so that microwave shielding can be achieved to prevent microwave leakage. In some embodiments, a waveguide assembly is also provided in the microwave rice cooker, and the waveguide assembly is formed with a waveguide channel, and the antenna end of the magnetron 10 is inserted in the waveguide channel, and one end of the waveguide channel is connected to the heating cavity, so that the microwave generated by the magnetron 10 can be transmitted to the heating cavity via the waveguide channel; further, the waveguide channel can be connected to the bottom of the shielding shell to evenly transfer microwave energy from the bottom of the heating cavity to all parts of the heating cavity, which is conducive to making the microwave in the heating cavity uniform and improving the heating effect. The cover of the microwave rice cooker can also be provided with a steam valve, which can connect the heating cavity and the external space of the microwave rice cooker when the steam valve is opened, so that steam and other gases can be discharged outward, thereby adjusting the pressure in the heating cavity to avoid excessive pressure.

[0063] The above are only preferred embodiments of the present invention, and do not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A heat dissipation structure of a magnetron, characterized in that, Comprising: An installation bracket, the installation bracket forms an installation cavity with an opening, and the installation cavity is used for installing the magnetron; An air guiding structure, the air guiding structure forms an air duct, and an air flow outlet of the air duct is communicated with the opening of the installation cavity; And A cooling fan, at least 80% of the opening area of the air outlet of the cooling fan is oppositely arranged with respect to the air flow inlet of the air duct.

2. The heat dissipation structure of the magnetron according to claim 1, characterized in that At least 80% of the opening area of the air flow outlet is oppositely arranged with respect to the opening of the installation bracket.

3. The heat dissipation structure of the magnetron according to claim 1, characterized in that, The heat dissipation structure further includes a plurality of heat dissipation fins that are stacked and spaced in the installation cavity, and the arrangement direction of the plurality of heat dissipation fins forms an included angle with the air flow direction at the opening of the installation bracket, and the heat dissipation fins are provided with installation holes for passing through the magnetron.

4. The heat dissipation structure of the magnetron according to claim 3, characterized in that, The air flow outlet is spaced from the heat dissipation fins.

5. The heat dissipation structure of the magnetron according to claim 4, characterized in that, The distance D between the air flow outlet and the heat dissipation fins satisfies 2 mm ≤ D ≤ 5 mm.

6. The heat dissipation structure of the magnetron according to claim 1, characterized in that, The air duct is arranged to be constricted in the direction from the air flow inlet to the air flow outlet.

7. The heat dissipation structure of the magnetron according to claim 1, characterized in that, The cooling fan includes a fan bracket and a fan blade, the fan bracket forms a blowing cavity, and is provided with an air inlet and the air outlet that communicate with the blowing cavity, and the fan blade is rotatably arranged in the blowing cavity.

8. The heat dissipation structure of the magnetron according to claim 7, characterized in that, The air guiding structure is integrally formed with the fan bracket; Or, the air guiding structure is connected to the fan bracket.

9. The heat dissipation structure of the magnetron according to any one of claims 1 to 8, characterized in that, The cooling fan is an axial flow fan.

10. A magnetron assembly, characterized in that, Comprising a magnetron and the heat dissipation structure according to any one of claims 1 to 9, the magnetron is arranged in the installation cavity.

11. A microwave cooking appliance, characterized in that, Comprising the magnetron assembly according to claim 10.

12. The microwave cooking appliance according to claim 11, characterized in that, The microwave cooking appliance includes a cooking pot body and a lid body, the cooking pot body forms a heating cavity with an opening at the top, the lid body is pivotally covered on the opening of the heating cavity, and the magnetron of the magnetron assembly can emit microwaves into the heating cavity.

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