Microwave oven heat dissipation structure and microwave oven

Abstract

The present invention relates to the technical field of microwave ovens, and discloses a microwave oven heat dissipation structure and a microwave oven. The microwave oven heat dissipation structure includes an electric control cavity, a first fan and a second fan arranged on the cavity wall of the electric control cavity; a side air guide plate located on the side of the air outlet of the second fan is arranged in the electric control cavity, and the transformer installation position and / or capacitor installation position in the electric control cavity are located on the air outlet path of the second fan. The two fans can use fans with smaller diameters to reduce the overall air volume and aerodynamic noise to achieve a silent effect. When the overall air volume is reduced, the cooling airflow generated by the first fan is guided by the first air duct to fully cool the magnetron at the other end of the first air duct, while the cooling airflow generated by the second fan can cool other generating components on its flow path, such as the transformer, so that the components inside the microwave oven can achieve the required heat dissipation effect, which greatly improves the product quality and user experience.

Description

Technical Field

[0001] The present invention relates to the technical field of microwave ovens, and in particular to a microwave oven heat dissipation structure and a microwave oven. Background Art

[0002] Microwave ovens, as convenient cooking appliances for heating, steaming, and baking food, are becoming increasingly common in households due to their ease of use, becoming an indispensable kitchen appliance. Within a microwave oven, the magnetron, which generates microwaves for heating, and the transformer, which supplies high voltage to the magnetron, are the two largest heat-generating components. The continuous generation of large amounts of heat can cause these components to heat up dramatically, impacting proper operation. The operating temperature of the magnetron and transformer is typically maintained between 200 and 300 degrees Celsius. Furthermore, the influence of these two major heat-generating components can significantly increase the operating temperature of other surrounding components. Therefore, to ensure the proper functioning of all components and minimize the impact of high temperatures on their lifespan, it is necessary to promptly dissipate the heat within the microwave oven.

[0003] Existing products primarily use a large-diameter AC fan. This fan is fixed to the back panel of the control room. In front of the fan outlet, the upper half houses the magnetron, and the lower half houses the transformer. A single fan directly blows heat directly onto both the magnetron and the transformer. Most of the airflow in the upper half passes through the magnetron to remove heat, while a small portion flows upward to cool components above the fan, such as the filter board and power cord branch. The airflow in the lower half primarily cools the transformer, while also cooling the capacitors below the fan and components on the remote electronics panel.

[0004] To maintain the microwave's internal electronic components within the permissible temperature range, the cooling fan must provide sufficient cooling airflow, requiring a relatively high speed (approximately 2400-2600 rpm). Existing fans have large diameters and high speeds, resulting in high aerodynamic noise. Consequently, the aerodynamic noise levels of microwave ovens currently on the market generally exceed 56dB. However, as living standards improve, the demand for comfort in household appliances is becoming increasingly stringent, and higher noise levels can negatively impact consumer experience. Summary of the Invention

[0005] The purpose of the present invention is to provide a microwave oven heat dissipation structure, which can significantly reduce the aerodynamic noise of the microwave oven while enabling the components inside the microwave oven to achieve a heat dissipation effect that meets the requirements, thereby greatly improving product quality and user experience.

[0006] In order to achieve the above-mentioned objectives, the present invention provides a microwave oven heat dissipation structure, comprising an electronic control cavity, a first fan, and a second fan, wherein the first fan and the second fan are arranged on the cavity wall of the electronic control cavity; a side air guide plate is provided in the electronic control cavity, which is located on the side of the air outlet of the second fan to guide the air flow of the second fan to be transported forward, wherein the transformer installation position and / or the capacitor installation position in the electronic control cavity are located on the air outlet path of the second fan.

[0007] Through the above technical solution, since two fans are provided, compared with the AC fan with a larger diameter in the prior art, these two fans can adopt fans with smaller diameters, such as axial fans, so that each fan does not need to run at a very high speed, which can reduce the overall air volume, thereby greatly reducing the aerodynamic noise of the microwave oven and achieving a silent effect. At the same time, when the overall air volume is reduced, the side air guide plate provided at the air outlet of the second fan guides the air flow of the second fan to be transported forward through the transformer installation position and / or the capacitor installation position to cool the transformers and / or capacitors installed at their respective positions, while the first fan can cool other components, so that the components inside the microwave oven can achieve the required heat dissipation effect, which greatly improves the product quality and user experience.

[0008] Furthermore, when the transformer installation position and the capacitor installation position are both provided on the air outlet path of the second fan, the capacitor installation position is located between the transformer installation position and the air outlet of the second fan.

[0009] Furthermore, the microwave oven heat dissipation structure also includes a transformer installed on the transformer installation position and a capacitor installed on the capacitor installation position, wherein the transformer, the capacitor and the air outlet of the second fan are arranged at intervals, and the height of the transformer is higher than the height of the capacitor, so that a part of the airflow sent out by the second fan flows forward along the upper surface of the capacitor, and after being blocked by the transformer, it can be deflected downward and reflux from the lower surface of the capacitor to return to the air outlet of the second fan to form a surrounding airflow around the capacitor.

[0010] In addition, the side air guide plates are respectively provided on the two sides of the air outlet of the second fan, and a straight channel is formed between the two side air guide plates.

[0011] In addition, the microwave oven heat dissipation structure further includes a first air duct, wherein one end of the first air duct is connected to the air outlet of the first fan, and the other end of the first air duct extends to the magnetron installation position in the electric control cavity.

[0012] Furthermore, the microwave oven heat dissipation structure further includes a second air duct extending toward the installation position of the filter board in the electronic control cavity, and the second air duct is connected to the air outlet of the first fan.

[0013] Furthermore, the microwave oven heat dissipation structure includes a third air duct extending toward the installation position of the power cord bifurcation member in the electric control cavity, and the third air duct is connected to the air outlet of the first fan.

[0014] Furthermore, the lower wall, left wall and right wall of one end of the first air duct are respectively connected to the lower edge, left edge and right edge of the air outlet of the first fan, and the upper wall of one end of the first air duct is lower than the upper edge of the air outlet of the first fan, so that a part of the air outlet of the first fan leaks out; a guide plate extending toward the front of the air outlet of the first fan is provided on the upper edge to form the second air duct.

[0015] Furthermore, the guide plate is an arc-shaped plate, and the concave surface of the arc-shaped plate faces the upper wall.

[0016] Furthermore, the guide plate is arranged on a part of the upper edge; a connected vertical guide front plate and vertical guide side plates are provided at a position of another part of the upper wall close to the upper edge, wherein the vertical guide front plate is located in front of the first fan air outlet, the vertical guide side plates are located on the side of the first fan air outlet, and the vertical guide front plate and the vertical guide side plates form the third air duct.

[0017] In addition, in a direction from one end to the other end of the first air duct, the distance between the upper wall and the lower wall of the first air duct gradually increases, and the distance between the left wall and the right wall of the first air duct gradually decreases.

[0018] Furthermore, the end of the first air duct facing the magnetron installation position also includes an equal-diameter extended air duct section.

[0019] In addition, in the height direction of the microwave oven, the first fan and the second fan are arranged up and down and are set on a fan bracket, and the fan bracket is detachably connected to the rear cavity wall of the electronic control cavity.

[0020] Finally, the present invention provides a microwave oven comprising any of the microwave oven heat dissipation structures described above. Thus, as described above, the microwave oven significantly reduces aerodynamic noise while achieving satisfactory heat dissipation for components within the microwave oven, thereby significantly improving the quality of the microwave oven and user experience.

[0021] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following detailed description, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0023] Figure 1 This is a partial three-dimensional structural diagram of a microwave oven heat dissipation structure provided by a specific embodiment of the present invention;

[0024] Figure 2 yes Figure 1 A schematic side view of the heat dissipation structure of a microwave oven is shown;

[0025] Figure 3 yes Figure 1 The top view structural diagram of the microwave oven heat dissipation structure is shown.

[0026] Description of Reference Numerals

[0027] 1-electric control chamber, 2-first fan, 3-second fan, 4-first air duct, 5-second air duct, 6-third air duct, 7-upper wall, 8-upper edge, 9-guide plate, 10-vertical guide front plate, 11-vertical guide side plate, 12-magnetron, 13-filter plate, 14-power cord bifurcation, 15-transformer, 16-capacitor, 17-side guide plate. DETAILED DESCRIPTION

[0028] The following describes the specific embodiments of the present invention in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0029] refer to Figure 1 and Figure 2 As shown in the structure, the microwave oven heat dissipation structure provided by the present invention includes an electronic control cavity 1, a first fan 2, and a second fan 3, wherein corresponding components required for the operation of the microwave oven can be arranged in the electronic control cavity 1, and the first fan 2 and the second fan 3 are arranged on the cavity wall of the electronic control cavity 1; a side air guide plate 17 is provided in the electronic control cavity 1, which is located on the side of the air outlet of the second fan 3 to guide the air flow of the second fan 3 to be transported forward, wherein the transformer installation position and / or the capacitor installation position in the electronic control cavity 1 are located on the air outlet path of the second fan 3.

[0030] In this technical solution, since two fans are provided, compared with the AC fan with a larger diameter in the prior art, these two fans can adopt fans with smaller diameters, such as axial fans, so that each fan does not need to run at a very high speed, which can reduce the overall air volume, thereby greatly reducing the aerodynamic noise of the microwave oven and achieving a silent effect. At the same time, when the overall air volume is reduced, the side air guide plate 17 provided at the air outlet of the second fan 3 can prevent the air flow of the second fan 3 from leaking from the side and guide the air flow, so that the air flow is more concentrated and transported to the front through the transformer installation position and / or capacitor installation position to cool the transformers and / or capacitors installed at their respective positions, while the first fan 2 can cool other components so that the components inside the microwave oven can achieve the required heat dissipation effect, greatly improving the product quality and user experience.

[0031] Of course, the installation position of the transformer and the installation position of the capacitor can be selected according to actual needs. For example, in one embodiment, Figure 2 As shown, when both the transformer mounting position and the capacitor mounting position are provided on the air outlet path of the second fan 3, the capacitor mounting position is located between the transformer mounting position and the air outlet of the second fan 3. In this way, since the heat generated by the capacitor is generally less than that generated by the transformer, the cooling air delivered by the second fan 3 can first cool the capacitor, and the temperature rise of the cooling air is almost minimal, so it can also effectively cool the transformer.

[0032] Furthermore, in one embodiment, the heat dissipation structure of the microwave oven of the present invention may not include the transformer 15 and the capacitor 16, and the transformer 15 and the capacitor 16 may be installed in their respective positions when the microwave oven is assembled; or, in another embodiment, the heat dissipation structure of the microwave oven of the present invention includes the transformer 15 and the capacitor 16, such as Figure 2 As shown, the microwave oven heat dissipation structure further includes a transformer 15 mounted on the transformer mounting position and a capacitor 16 mounted on the capacitor mounting position, wherein the transformer 15, capacitor 16, and the air outlet of the second fan 3 are spaced apart, and the height of the transformer 15 is higher than that of the capacitor 16, so that a portion of the airflow sent out by the second fan 3 flows forward along the upper surface of the capacitor 16, and after being blocked by the transformer 15, it can be deflected downward and flow back from the lower surface of the capacitor 16 to return to the air outlet of the second fan 3 to form a surrounding airflow around the capacitor 16. In this way, the second fan 3 can continuously supply new cooling air, while a portion of the cooling air forms a surrounding airflow around the capacitor 16 to carry away the heat generated by the capacitor 16 as a whole.

[0033] In addition, of course, the setting of the side air guide plate 17 can be determined according to actual needs. For example, when the filter plate of the microwave oven is installed on the side wall of the electronic control cavity 1, due to the obstruction of the filter plate, the side air guide plate 17 can be set only at the position of the other side wall opposite to the filter plate. Of course, the end of the side air guide plate 17 facing the second fan 3 is connected to the side edge of the second fan 3.

[0034] Alternatively, when the filter plate is mounted on the outer surface of the lower wall of the first air duct 4, or mounted above the first air duct 4, side air guide plates 17 may be provided on opposite sides, with the ends of each side air guide plate 17 facing the second fan 3 being connected to the side edges of the second fan 3. That is, the two sides of the air outlet of the second fan 3 are provided with side air guide plates 17, respectively, and a straight channel is formed between the two side air guide plates 17. In this way, Figure 2 As shown, the transformer 15 is located at the outlet of the straight channel, and the capacitor can be located at the lower part of the straight channel, so that the cooling air of the second fan 3 blows directly over the capacitor for precise cooling, while cooling the transformer 15 at the outlet.

[0035] In addition, in order to improve the accurate and efficient cooling of the magnetron of the microwave oven, it is preferred that Figure 1 and 2 As shown, the microwave oven heat dissipation structure further includes a first air duct 4 , wherein one end of the first air duct 4 is connected to the air outlet of the first fan 2 , and the other end of the first air duct 4 extends to the magnetron installation position in the electric control cavity 1 .

[0036] In this way, when the overall air volume is reduced, the cooling air flow generated by the first fan 2 is guided through the first air duct 4 to fully cool the magnetron 12 at the other end of the first air duct 4, while the cooling air flow generated by the second fan 3 can cool other components on its flow path, such as Figure 2 The transformer 15 and the capacitor 16 shown in the figure are cooled so that the components inside the microwave oven can achieve the required heat dissipation effect, which greatly improves the product quality and user experience.

[0037] Of course, in the microwave oven heat dissipation structure of the present invention, the filter plate and the power cord bifurcation inside the microwave oven can also be cooled by the wind from the first fan or the second fan. For example, the filter plate and the power cord bifurcation can be located in the first air duct, or be arranged on the cooling air flow path of the second fan, or the power cord bifurcation can be arranged at the air inlet position of the first fan or the second fan to be cooled by the airflow inhaled by the first fan or the second fan.

[0038] Alternatively, in another embodiment, the microwave oven heat dissipation structure also includes a second air duct 5 extending toward the filter plate installation position in the electronic control cavity 1, and the second air duct 5 is connected to the air outlet of the first fan 2, so that a part of the cooling air discharged by the first fan 2 can cool the filter plate at the filter plate installation position under the guidance of the second air duct 5.

[0039] The connection between the second air duct 5 and the air outlet of the first fan 2 can be achieved through various structures. For example, in one structure, one end of the second air duct 5 can be connected to the wall of the first air duct 4, and the other end extends toward the filter plate installation location. Alternatively, in another structure, one end of the second air duct 5 directly faces the air outlet of the first fan, and the other end extends toward the filter plate installation location.

[0040] Furthermore, the microwave oven heat dissipation structure includes a third air duct 6 extending toward the power cord bifurcation installation position in the electronic control cavity 1, and the third air duct 6 is connected to the air outlet of the first fan 2. In this way, a part of the cooling air discharged by the first fan 2 can cool the power cord bifurcation at the power cord bifurcation installation position under the guidance of the third air duct 6.

[0041] The connection between the third air duct 6 and the air outlet of the first fan 2 can be achieved through various structures. For example, in one structure, one end of the third air duct 6 can be connected to the wall of the first air duct 4, and the other end extends toward the filter plate installation location. Alternatively, in another structure, one end of the third air duct 6 directly faces the air outlet of the first fan, and the other end extends toward the filter plate installation location.

[0042] For example, in one embodiment, Figure 1 、 Figure 2 and Figure 3 As shown, in Figure 2 and Figure 3 In the height direction of the graphical interface, the lower wall of one end of the first air duct 4 ( Figure 2 height direction), left and right walls ( Figure 3 The first air duct 4 is connected to the air outlet of the first fan 2 in the height direction, and the upper wall 7 at one end of the first air duct 4 is lower than the upper edge 8 of the air outlet of the first fan 2, so that a part of the air outlet leaks out; a guide plate 9 extending toward the front of the air outlet of the first fan 2 is provided on the upper edge 8 to form a second air duct 5. In this way, the filter plate 13 can be located on the path of the second air duct 5, and the cooling air flowing out of the leaked part of the air outlet of the first fan 2 is guided by the guide plate 9 to cool the filter plate. Of course, as shown in FIG. Figure 2 As shown, the filter plate 13 can be arranged on the upper wall of the first air duct 4 , or the filter plate 13 can be fixedly installed on the side wall of the electric control cavity and located above the upper wall of the first air duct 4 .

[0043] Of course, the deflector 9 can have any appropriate shape, as long as it can guide a portion of the airflow toward the front of the air outlet of the first fan 2. For example, in one form, the deflector 9 may include an inclined plate connected to the upper edge 8 and extending obliquely upward, and a straight plate connected to the upper portion of the inclined plate and extending straight forward.

[0044] Or, as Figure 1 and Figure 2 As shown, the guide plate 9 is an arc-shaped plate, and the concave surface of the arc-shaped plate faces the upper wall 7. In this way, the inner arc-shaped concave surface of the arc-shaped plate is easier to guide the wind flow smoothly and reduce the loss of the wind flow.

[0045] Of course, the third air duct 6 can be formed by utilizing the feature that the upper wall 7 at one end of the first air duct 4 is lower than the upper edge 8 of the air outlet of the first fan 2. Figure 1 and Figure 2 As shown, the guide plate 9 is provided on a portion of the upper edge 8, that is, the guide plate 9 is not provided on the other portion of the upper edge 8; thus, a vertical guide front plate 10 and a vertical guide side plate 11 are provided at a position close to the other portion of the upper edge 8 of the upper wall 7, wherein the vertical guide front plate 10 is located in front of the air outlet, and the vertical guide side plate 11 is located to the side of the air outlet, and the vertical guide front plate 10 and the vertical guide side plate 11 form a third air duct 6. In this way, a portion of the cooling air flowing out of the leaked portion of the air outlet of the first fan 2 is guided by the guide plate 9 to cool the filter plate, and the other portion flows upward under the guidance of the vertical guide front plate 10 and the vertical guide side plate 11 to cool the power cord bifurcation 14 above. At this time, the power cord bifurcation 14 is provided above the electric control chamber 1.

[0046] Of course, the distance between the upper wall 7 at one end of the first air duct 4 and the upper edge 8 of the air outlet of the first fan 2 can be appropriately set, for example, the distance between the upper wall 7 and the upper edge 8 is 15-25 mm, more preferably 20 mm.

[0047] In addition, in order to enhance the cooling of the magnetron 12, it is preferred that Figure 1-3 As shown, the distance between the upper and lower walls of the first air duct 4 gradually increases from one end to the other to expand the cooling area, while the distance between the left and right walls of the first air duct 4 gradually decreases to further converge the airflow. In this way, the airflow can be more focused and delivered to the magnetron 12 for more sufficient cooling.

[0048] Furthermore, to facilitate smooth cooling of the magnetron 12 by the cooling air delivered by the first air duct 4, the end of the first air duct 4 facing the magnetron mounting location preferably includes a uniformly extended air duct section. In this way, the cooling air is rectified by the uniformly extended air duct section and can be blown smoothly and evenly toward the magnetron for more comprehensive cooling.

[0049] Of course, the equal-diameter extended air duct section can be made of heat-resistant materials such as metal materials so that it can abut against the magnetron, or the equal-diameter extended air duct section can be made of materials with general heat resistance, such as hard plastic. At this time, the front end of the equal-diameter extended air duct section needs to maintain an appropriate distance from the magnetron to avoid the high temperature generated by the magnetron softening the front end of the equal-diameter extended air duct section.

[0050] In addition, the specific installation positions of the first fan 2 and the second fan 3 can be selected according to actual needs. For example, the two can be installed separately to be located on different side walls of the electric control cavity, or Figure 1 and Figure 2 As shown, for ease of installation, first fan 2 and second fan 3 are arranged vertically in the height direction of the microwave oven and mounted on a fan bracket, which is detachably connected to the rear wall of electronic control chamber 1. Due to the fan bracket, the wall of first air duct 4 can also be detachably connected to the fan bracket, allowing replacement of first air duct 4 for microwave ovens of different specifications.

[0051] Since the first fan 2 and the second fan 3 are arranged up and down, and the transformer installation position and the capacitor installation position are located on the air delivery path of the second fan 3, such an arrangement not only makes it convenient for heavier components such as the transformer and the capacitor to be supported by the bottom wall of the electronic control chamber, but also can make full use of the second fan 3 for cooling, and the two fans can also be installed together on the rear side wall of the electronic control chamber.

[0052] Finally, the present invention provides a microwave oven comprising any of the microwave oven heat dissipation structures described above. For example, in the case of a microwave oven comprising a first air duct 4, the other end of the first air duct 4 extends to the magnetron 12, while other components within the microwave oven, such as the transformer 15 and capacitor 16, can be located within the cooling path of the second fan 3. In this manner, the microwave oven significantly reduces aerodynamic noise while achieving satisfactory heat dissipation for the components within the microwave oven, significantly improving the quality of the microwave oven and the user experience.

[0053] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the scope of protection of the present invention.

[0054] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. To avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0055] In addition, the various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A microwave oven heat dissipation structure, characterized in that: It comprises an electric control chamber (1), a first fan (2) and a second fan (3), wherein the first fan (2) and the second fan (3) are arranged on the cavity wall of the electric control chamber (1); A side air guide plate (17) is provided in the electric control chamber (1) and is located on the side of the air outlet of the second fan (3) to guide the airflow of the second fan (3) to be transported forward. A transformer installation position and a capacitor installation position are provided on the air outlet path of the second fan (3), and the capacitor installation position is located between the transformer installation position and the air outlet of the second fan (3); The microwave oven heat dissipation structure further comprises a transformer (15) mounted on the transformer mounting position and a capacitor (16) mounted on the capacitor mounting position, wherein the transformer (15), the capacitor (16) and the air outlet of the second fan (3) are arranged at intervals, and the height of the transformer (15) is higher than the height of the capacitor (16), so that a portion of the airflow sent out by the second fan (3) flows forward along the upper surface of the capacitor (16), and after being blocked by the transformer (15), can be deflected downward and flow back from the lower surface of the capacitor (16) to return to the air outlet of the second fan (3) to form a surrounding airflow around the capacitor (16); The two sides of the air outlet of the second fan (3) are respectively provided with the side air guide plates (17), and a straight channel is formed between the two side air guide plates (17).

2. The microwave oven heat dissipation structure according to claim 1, characterized in that: The microwave oven heat dissipation structure further comprises a first air duct (4), wherein one end of the first air duct (4) is connected to the air outlet of the first fan (2), and the other end of the first air duct (4) extends to the magnetron installation position in the electric control cavity (1).

3. The microwave oven heat dissipation structure according to claim 2, characterized in that: The microwave oven heat dissipation structure further comprises a second air duct (5) extending towards the installation position of the filter plate in the electric control cavity (1), and the second air duct (5) is connected to the air outlet of the first fan (2).

4. The microwave oven heat dissipation structure according to claim 3, characterized in that: The microwave oven heat dissipation structure comprises a third air duct (6) extending toward the installation position of the power cord bifurcation member in the electric control cavity (1), and the third air duct (6) is communicated with the air outlet of the first fan (2).

5. The microwave oven heat dissipation structure according to claim 4, characterized in that: The lower wall, left wall and right wall of one end of the first air duct (4) are respectively connected to the lower edge, left edge and right edge of the air outlet of the first fan (2); the upper wall (7) of one end of the first air duct (4) is lower than the upper edge (8) of the air outlet of the first fan (2), so that a part of the air outlet of the first fan (2) leaks out; A guide plate (9) extending in front of the air outlet of the first fan (2) is provided on the upper edge (8) to form the second air duct (5).

6. The microwave oven heat dissipation structure according to claim 5, characterized in that: The guide plate (9) is an arc-shaped plate, and the concave surface of the arc-shaped plate faces the upper wall (7).

7. The microwave oven heat dissipation structure according to claim 5, characterized in that: The guide plate (9) is arranged on a portion of the upper edge (8); A vertical guide front plate (10) and a vertical guide side plate (11) are connected and provided at another portion of the upper wall (7) close to the upper edge (8), wherein the vertical guide front plate (10) is located in front of the air outlet of the first fan (2), and the vertical guide side plate (11) is located to the side of the air outlet of the first fan (2), and the vertical guide front plate (10) and the vertical guide side plate (11) form the third air duct (6).

8. The microwave oven heat dissipation structure according to claim 2, characterized in that: In a direction from one end to the other end of the first air duct, the distance between the upper wall and the lower wall of the first air duct (4) gradually increases, and the distance between the left wall and the right wall of the first air duct (4) gradually decreases.

9. The microwave oven heat dissipation structure according to claim 8, characterized in that: The end of the first air duct (4) facing the magnetron installation position also includes an equal-diameter extended air duct section.

10. The microwave oven heat dissipation structure according to claim 1, characterized in that: In the height direction of the microwave oven, the first fan (2) and the second fan (3) are arranged up and down and are provided on a fan bracket, and the fan bracket is detachably connected to the rear cavity wall of the electric control cavity (1).

11. A microwave oven, characterized in that: The microwave oven comprises the microwave oven heat dissipation structure according to any one of claims 1-10.

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