Micro-wave oven

Abstract

This utility model relates to the field of microwave oven technology, specifically providing a microwave oven designed to solve the problem that the image acquisition device on the door of existing microwave ovens suffers performance degradation or damage due to high temperatures during heating. To this end, this utility model provides a microwave oven comprising a body and a door. The body is equipped with a cooling fan and a first cooling duct, while a second cooling duct is formed at the edge of the door. The image acquisition device is disposed within the second cooling duct. When the door is closed, the second cooling duct and the first cooling duct are in airflow communication. The microwave oven provided by this utility model, by incorporating a second cooling duct in the door and connecting it to the first cooling duct at the bottom of the body, utilizes the existing cooling fan to dissipate heat from the image acquisition device located in the door, avoiding the need for a dedicated cooling fan. This reduces the overall cost of the microwave oven while preventing excessively high operating temperatures for the image acquisition device.

Description

Technical Field

[0001] This utility model relates to the field of microwave oven technology, and specifically provides a microwave oven. Background Technology

[0002] A microwave oven is a common household appliance that uses microwaves to heat food. Its magnetron continuously generates microwaves to heat the food inside the cooking cavity.

[0003] With the development of smart home appliance technology, many microwave ovens are equipped with cameras on their doors to capture real-time images of the food inside the cooking cavity, allowing for real-time monitoring of the food's cooking status. However, microwave ovens generate high temperatures during heating, and as a precision electronic component, the camera's operating temperature must be controlled within a reasonable range. Excessive ambient temperature can lead to decreased camera performance or even damage, thus requiring effective heat dissipation measures.

[0004] Currently, the common solution for heat dissipation of cameras is to add a dedicated cooling fan around them to reduce the temperature around the camera through forced convection. However, this solution has the following obvious drawbacks: First, adding an extra cooling fan increases product costs; second, the additional cooling fan will cause noise problems when it is running; in addition, space on the door is limited, and adding a cooling fan may affect the overall structural layout and increase design complexity. Utility Model Content

[0005] The present invention aims to solve the above-mentioned technical problem, namely, to solve the problem that the image acquisition device on the door of the existing microwave oven will suffer performance degradation or damage due to high temperature during the heating process.

[0006] This utility model provides a microwave oven, which includes a body and a door hinged to the body. The body is provided with a cooling fan and a first cooling duct. The cooling fan is used to promote air circulation within the first cooling duct. A second cooling duct is formed in the edge region of the door, and an image acquisition device is disposed within the second cooling duct.

[0007] When the door is closed, the second heat dissipation duct is connected to the first heat dissipation duct, so that the airflow driven by the cooling fan flows through the first heat dissipation duct and the second heat dissipation duct in sequence, so as to dissipate heat from the image acquisition device.

[0008] In some feasible embodiments of the microwave oven described above, the body includes a base, the base forming a bottom space, the cooling fan and the first cooling duct are disposed in the bottom space, the first cooling duct communicates with the bottom space, and the bottom space is also provided with a heating element, the heating element being arranged on the air intake path of the first cooling duct.

[0009] In some feasible embodiments of the microwave oven described above, the first heat dissipation duct includes a first duct section, a second duct section, and a third duct section connected in sequence. The first duct section is located on the side of the bottom space away from the door body along the width direction of the base. The second duct section is located on one side of the bottom space along the length direction. The third duct section is located on the side of the bottom space closer to the door body along the width direction of the base. The first duct section is connected to the bottom space. When the door body is closed, the third duct section is in airflow communication with the second heat dissipation duct.

[0010] In some feasible embodiments of the microwave oven described above, the second heat dissipation duct includes a fourth duct section and a fifth duct section that are interconnected. The fourth duct section is located on one side of the door body along the length direction of the door body, and when the door body is closed, the fourth duct section is in airflow communication with the third duct section. The fifth duct section is located on the side of the door body away from the base along the width direction of the door body.

[0011] In some feasible embodiments of the microwave oven described above, the air outlet of the first heat dissipation duct and the air inlet of the second heat dissipation duct are arranged adjacent to each other.

[0012] When the door is closed, the air outlet of the first heat dissipation duct and the air inlet of the second heat dissipation duct are directly opposite each other and the airflow is connected.

[0013] In some feasible embodiments of the microwave oven described above, the microwave oven further includes a telescopic tube, the two ends of which are respectively connected to the air outlet of the first heat dissipation duct and the air inlet of the second heat dissipation duct.

[0014] When the door is in a closed or open state, the air outlet of the first heat dissipation duct is connected to the air inlet of the second heat dissipation duct through the telescopic pipe.

[0015] In some feasible embodiments of the microwave oven described above, the door includes a door frame and a metal plate frame, the metal plate frame is disposed on the door frame, and the edge portion of the metal plate frame and the edge portion of the door frame together constitute the second heat dissipation duct.

[0016] In some feasible embodiments of the microwave oven described above, the air inlet and / or air outlet of the second heat dissipation duct are formed on the outer side of the door frame.

[0017] In some feasible embodiments of the microwave oven described above, the metal frame is formed with a mesh structure for the image acquisition device to acquire images.

[0018] In some feasible embodiments of the microwave oven described above, the door also includes a heat-insulating glass panel disposed on the side of the metal frame near the main body.

[0019] The microwave oven provided by this utility model features a second heat dissipation duct in the door, connected to a first heat dissipation duct at the bottom of the unit. This allows the existing cooling fan to dissipate heat from the image acquisition device located in the door, eliminating the need for a dedicated cooling fan. This reduces the overall cost of the microwave oven while preventing the image acquisition device from overheating. Specifically, compared to existing solutions that use a dedicated cooling fan on the door to cool the image acquisition device, this utility model uses a second heat dissipation duct to guide airflow, connecting it to the first cooling duct at the bottom of the unit. The existing cooling fan simultaneously dissipates heat from both the heating element and the image acquisition device, reducing the cost of adding an extra fan and lowering noise from multiple fans. Furthermore, instead of placing the second heat dissipation duct in the middle of the door, this utility model places it at the edge of the door. This allows the existing frame structure of the door edge to serve as the duct wall, reducing the need for additional components. It also avoids the problem of the duct obstructing the middle of the door, ensuring that the user can clearly observe the food inside the cooking cavity. Attached Figure Description

[0020] The preferred embodiments of this utility model are described below with reference to the accompanying drawings, in which:

[0021] Figure 1 This is one of the structural schematic diagrams of the microwave oven of this utility model, wherein the door is in a closed state;

[0022] Figure 2 This is the second structural schematic diagram of the microwave oven of this utility model, in which the door is in the fully open state;

[0023] Figure 3 This is a schematic diagram of the structure of the body of this utility model;

[0024] Figure 4 This is a structural schematic diagram of the base of this utility model, wherein the length and width directions of the base are indicated in the figure;

[0025] Figure 5 This is a top view of the base of this utility model, wherein the length and width directions of the base are marked in the figure, and the airflow path is also marked;

[0026] Figure 6 This is one of the structural schematic diagrams of the door body of this utility model, wherein the length direction and width direction of the door body are marked in the figure;

[0027] Figure 7 This is an exploded view of the door body of this utility model, wherein the length and width directions of the door body are marked in the figure;

[0028] Figure 8 This is an exploded view of the door frame and metal plate frame of this utility model, wherein the length and width directions of the door are marked in the figure;

[0029] Figure 9 This is the second structural schematic diagram of the door body of this utility model, in which the length and width directions of the door body are marked, and the airflow path is also marked;

[0030] Figure 10 This is a schematic diagram of the working principle of the microwave oven of this utility model, in which the airflow path is indicated.

[0031] List of reference numerals in the attached diagram:

[0032] 1-Main body; 11-Outer shell; 111-Louvre opening; 12-Base; 121-Bottom space; 122-Ventilation hole; 13-First heat dissipation air duct; 131-First air duct section; 1311-First air inlet; 132-Second air duct section; 133-Third air duct section; 1331-First air outlet; 14-Cooling fan; 15-Heating element; 2-Door body; 21-Door frame; 211-Hollow part; 22-Metal plate frame; 221-Plate part; 23-Heat insulation glass panel; 24-Second heat dissipation air duct; 241-Fourth air duct section; 2411-Second air inlet; 242-Fifth air duct section; 2421-Second air outlet; 25-Image acquisition device. Detailed Implementation

[0033] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0034] It should be noted that in the description of this utility model, terms such as "upper", "lower", "inner", and "outer" that indicate direction or positional relationship are based on the direction or positional relationship shown in the accompanying drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0035] Furthermore, it should be noted that in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal connection of two components, and so on. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. In addition, the numerical terms used herein, such as "first," "second," and "third," are primarily (only) used to distinguish multiple similar objects, quantities, or processes; that is, they do not necessarily indicate any dependency and / or order between these objects, quantities, or processes. If a dependency and / or order is required, it will be explicitly stated in the context, or it will be obvious to those skilled in the art when understanding the specific embodiments.

[0036] like Figure 1 and Figure 2 As shown, this embodiment of the utility model provides a microwave oven, including a body 1 and a door 2. The body 1 has a generally rectangular parallelepiped structure and includes an outer shell 11 and a base 12 located below the outer shell 11. A cooking cavity (not shown) is provided inside the outer shell 11, and a loading / unloading opening is provided on the front of the cooking cavity, through which the user can load or unload cooked food. The door 2 is hinged to the front edge of the base 12 for opening or closing the loading / unloading opening.

[0037] It should be noted that, as Figure 1 As shown, when door 2 is closed, its front faces the front of the machine body 1, and the loading / unloading opening is closed. Door 2 can be in two open states: partially open and fully open. In both open states, the loading / unloading opening is not closed. For example, Figure 2 As shown, when the door 2 is fully open, the front of the door 2 faces the bottom of the body 1.

[0038] like Figure 3As shown, louvered openings 111 are provided on both sides of the outer casing 11. An air intake duct is formed between the two sides of the outer casing 11 and the two sides of the cooking cavity. The air intake duct and the louvered opening 111 on the same side are correspondingly connected, allowing external air to enter the air intake duct through the louvered opening 111. With this arrangement, while ensuring that air convection is not affected, the louvered structure of the louvered opening 111 can effectively prevent water from outside the outer casing 11 from dripping into the air intake duct through the louvered opening 111, thus achieving both heat dissipation and waterproofing functions.

[0039] like Figures 3 to 5 As shown, the base 12 forms a bottom space 121 that communicates with the air inlet duct. Several ventilation holes 122 are arranged on the bottom surface of the bottom space 121, which communicates with the outside through these holes. A first heat dissipation duct 13, a cooling fan 14, and a heating element 15 are disposed within the bottom space 121. The first heat dissipation duct 13 communicates with the bottom space 121 through its air inlet. The cooling fan 14 is positioned near the air inlet of the first heat dissipation duct 13. The air outlet of the cooling fan 14 corresponds to the air inlet of the first heat dissipation duct 13, and the air inlet of the cooling fan 14 is located within the bottom space 121. The cooling fan 14 is used to promote airflow within the first heat dissipation duct 13. The heating element 15 is arranged along the air inlet path of the first heat dissipation duct 13, specifically near the air inlet of the first heat dissipation duct 13. The heating element 15 can be an electrical component that generates heat during operation, such as a main control board or a magnetron. Driven by the cooling fan 14, a portion of the external air enters the bottom space 121 through the louver holes 111 and the air inlet duct, flows past the heating element 15, and then enters the first cooling duct 13. Another portion of the external air enters the bottom space 121 through several ventilation holes 122, flows past the heating element 15, and then enters the first cooling duct 13. This arrangement forces airflow from the heating element 15 into the first cooling duct 13 via forced convection, significantly improving the heat dissipation of the heating element 15. Furthermore, this dual-inlet structure increases airflow efficiency, further enhancing the heat dissipation of the heating element 15.

[0040] like Figures 6 to 9As shown, a second heat dissipation duct 24 is formed on the edge area of ​​the door 2. An image acquisition device 25 is installed inside the second heat dissipation duct 24. The image acquisition device 25 includes a camera for real-time acquisition of image information inside the cooking cavity, so as to monitor the cooking status of the food inside the cooking cavity in real time. The air inlet of the second heat dissipation duct 24 is adjacent to the air outlet of the first heat dissipation duct 13. When the door 2 is closed, the air outlet of the first heat dissipation duct 13 and the air inlet of the second heat dissipation duct 24 are directly opposite each other and the airflow is connected, so that the airflow driven by the cooling fan 14 flows through the first heat dissipation duct 13 and the second heat dissipation duct 24 in sequence to dissipate heat from the image acquisition device 25. When the door 2 is open, the air outlet of the first heat dissipation duct 13 and the air inlet of the second heat dissipation duct 24 are separated.

[0041] Alternatively, the microwave oven also includes a telescopic tube, the two ends of which are connected to the air outlet of the first heat dissipation duct 13 and the air inlet of the second heat dissipation duct 24, respectively. Whether the door 2 is closed or open, the air outlet of the first heat dissipation duct 13 maintains airflow communication with the air inlet of the second heat dissipation duct 24 through the telescopic tube. The telescopic tube has an adjustable extension / retraction function, allowing it to lengthen or shorten accordingly, thereby ensuring that the air outlet of the first heat dissipation duct 13 and the air inlet of the second heat dissipation duct 24 remain connected at all times.

[0042] Furthermore, such as Figures 3 to 5 As shown, the first heat dissipation duct 13 includes a first duct section 131, a second duct section 132, and a third duct section 133 connected in sequence. The first duct section 131 is located on the side of the bottom space 121 away from the door 2 along the width direction of the base 12. The second duct section 132 is located on one side of the bottom space 121 along the length direction. The third duct section 133 is located on the side of the bottom space 121 closer to the door 2 along the width direction of the base 12. The first duct section 131 has a first air inlet 1311 and forms the air inlet of the first heat dissipation duct 13. The first duct section 131 is connected to the bottom space 121 through the first air inlet 1311. The third duct section 133 has a first air outlet 1331 and forms the air outlet of the first heat dissipation duct 13. The opening of the first air outlet 1331 faces upward. Driven by the cooling fan 14, air enters the first air duct section 131 through the first air inlet 1311, and then passes through the second air duct section 132 and the third air duct section 133 in sequence, and finally is discharged upward through the first air outlet 1331.

[0043] Furthermore, such as Figures 6 to 9As shown, the door 2 includes a door frame 21 and a metal plate frame 22. The door frame 21 is a hollow frame structure with a hollow section 211 in the middle. The metal plate frame 22 has a plate-shaped section 221 in the middle, which effectively blocks microwaves from escaping from the cooking cavity. The plate-shaped section 221 corresponds to the hollow section 211 of the door frame 21. The plate-shaped section 221 has a mesh structure (not shown) for image acquisition by the image acquisition device 25. The mesh structure consists of several fine holes. By setting the mesh structure, the image acquisition device 25 can acquire image information from inside the cooking cavity in real time, provided that the plate-shaped section 221 effectively blocks microwaves. It should be noted that the principle by which the plate-shaped section 221 with the mesh structure blocks microwaves is common knowledge and will not be elaborated here.

[0044] Further reference Figures 6 to 9 The edge of the metal frame 22 has a frame-shaped structure and corresponds to the edge of the door frame 21. The metal frame 22 is correspondingly disposed on the door frame 21 so that the edge of the metal frame 22 and the edge of the door frame 21 together form the second heat dissipation duct 24. The air inlet and air outlet of the second heat dissipation duct 24 are formed on the outer surface of the door frame 21. Specifically, when the door 2 is in the closed state, the metal frame 22 is correspondingly disposed on the side of the door frame 21 closer to the body 1.

[0045] Further reference Figures 6 to 9The second heat dissipation duct 24 includes a fourth duct section 241 and a fifth duct section 242 that are interconnected. The image acquisition device 25 is disposed within the fifth duct section 242. The fourth duct section 241 is located on one side of the door body 2 along its length, and the fifth duct section 242 is located on the side of the door body 2 away from the base 12 along its width. The fourth duct section 241 has a second air inlet 2411 and forms the air inlet of the second heat dissipation duct 24. The second air inlet 2411 is disposed on the outer edge of the door frame 21. When the door body 2 is closed, the opening of the second air inlet 2411 faces downward and is directly opposite to and connected to the first air outlet 1331, which faces upward. The fifth duct section 242 has a second air outlet 2421 and forms the air outlet of the second heat dissipation duct 24. The second air outlet 2421 is disposed on the outer edge of the door frame 21. The fourth air duct section 241 is correspondingly arranged to the third air duct section 133 of the first heat dissipation air duct 13. When the door 2 is closed, the fourth air duct section 241 and the third air duct section 133 are in airflow communication. When the door 2 is closed, driven by the cooling fan 14, air enters the fourth air duct section 241 through the second air inlet 2411, flows through the fifth air duct section 242, and finally exits from the side of the door 2 through the second air outlet 2421. Through the above arrangement, the air at the image acquisition device 25 is discharged through the second air outlet 2421 by forced convection, which significantly improves the heat dissipation effect of the image acquisition device 25 and avoids performance degradation or damage to the image acquisition device 25 due to high temperature.

[0046] Specifically, such as Figure 8 As shown, one side edge of the metal plate frame 22 along the length of the door body 2 and one side edge of the door frame 21 along the length of the door body 2 together constitute the fourth air duct section 241. The side edge of the metal plate frame 22 away from the base 12 along the width of the door body 2 and the side edge of the door frame 21 away from the base 12 along the width of the door body 2 together constitute the fifth air duct section 242. The second air outlet 2421 is specifically located on the outer side of the door frame 21 away from the fourth air duct section 241.

[0047] It should be noted that the location of the second air outlet 2421 is not limited to the location set in this embodiment. Provided that the airflow can carry away the hot air around the image acquisition device 25 in a forced convection manner, the second air outlet 2421 can also be set at other locations on the outer edge of the door frame 21.

[0048] Alternatively, the fifth air duct section includes a first air duct section and a second air duct section that are interconnected. The first air duct section is connected to the fourth air duct section 241. The first air duct section is located on the side of the door body 2 away from the base 12 along the width direction of the door body 2. The image acquisition device 25 is disposed in the first air duct section. The second air duct section is located on the side of the door body 2 away from the fourth air duct section 241 along the length direction of the door body 2. The second air duct section has a second air outlet and forms the air outlet of the second heat dissipation air duct 24. The second air outlet is specifically disposed on the outer side of the door frame 21 away from the first air duct section.

[0049] It should be noted that the location of the second air outlet is not limited to the location shown in this embodiment. Provided that the airflow can carry away the hot air around the image acquisition device 25 in a forced convection manner, the second air outlet can also be located at other locations on the outer edge of the door frame 21.

[0050] Furthermore, such as Figure 6 , Figure 7 and Figure 9 As shown, the door 2 also includes a heat-insulating glass panel 23, which is used to block heat from entering the cooking cavity of the microwave oven when cooking food. When the door 2 is closed, the heat-insulating glass panel 23 is positioned on the side of the metal frame 22 closest to the main body 1, and corresponds to the plate-shaped portion 221 of the metal frame 22 and the hollow portion 211 of the door frame 21, respectively, so that the image acquisition device 25 can sequentially acquire images through the mesh structure of the plate-shaped portion 221 and the heat-insulating glass panel 23. Furthermore, the user can observe the state of the food inside the cooking cavity through the hollow portion 211 of the door frame 21, the mesh structure of the plate-shaped portion 221, and the heat-insulating glass panel 23.

[0051] The working principle of this microwave oven is as follows: When food needs to be heated in the cooking cavity, the door 2 is first closed to seal the opening for taking out and putting in the cooking cavity. At this time, the first air outlet 1331 and the second air inlet 2411 face each other and form airflow communication. Subsequently, the microwave oven begins to heat the food in the cooking cavity, while the cooling fan 14 is activated to provide heat dissipation for the heating element 15 and the image acquisition device 25.

[0052] The specific heat dissipation process of the microwave oven of this utility model is as follows: Figure 10As shown: With the door 2 closed, driven by the cooling fan 14, air from outside the microwave oven enters the bottom space 121 through the louver holes 111 and the ventilation holes 122. The incoming air flows past the heating element 15 and then enters the first cooling duct 13 through the first air inlet 1311. Within the first cooling duct 13, the air flows sequentially through the first duct section 131, the second duct section 132, and the third duct section 133, finally exiting upwards from the first air outlet 1331. Subsequently, the exited air enters the second cooling channel through the second air inlet 2411. Within the second cooling channel, the air flows sequentially through the fourth duct section 241 and the fifth duct section 242, finally exiting to the outside from the second air outlet 2421. During this cooling process, as the airflow passes over the heating element 15, forced convection draws the hot air surrounding the heating element 15 into the first cooling duct 13, significantly improving the heat dissipation efficiency of the heating element 15 and effectively reducing its temperature. At the same time, the airflow also carries away the hot air around the image acquisition device 25 in a forced convection manner and discharges it through the second air outlet 2421, effectively reducing the temperature of the image acquisition device 25, thereby significantly improving the heat dissipation efficiency of the image acquisition device 25, effectively reducing the temperature of the image acquisition device 25, and avoiding performance degradation or damage due to high temperature.

[0053] The microwave oven provided by this utility model, by setting a second heat dissipation duct 24 in the door body 2 and connecting it to the first heat dissipation duct 13 set at the bottom of the body 1, can use the existing cooling fan 14 to dissipate heat for the image acquisition device 25 set in the door body 2, avoiding the need to add a dedicated cooling fan 14. This reduces the overall cost of the machine while preventing the operating temperature of the image acquisition device 25 from becoming too high. Specifically, compared with the prior art solution of setting a dedicated cooling fan 14 on the door body 2 to cool the image acquisition device 25, this utility model sets a second heat dissipation duct 24 to guide airflow and connects it to the first heat dissipation duct 13 at the bottom of the body 1. It uses the existing cooling fan 14 to dissipate heat for both the heating element 15 and the image acquisition device 25, which not only reduces the cost of adding an additional cooling fan 14, but also reduces the noise generated by multiple fans operating. Furthermore, compared to the solution of setting the second heat dissipation duct 24 in the middle area of ​​the door body 2, this utility model sets the second heat dissipation duct 24 in the edge area of ​​the door body 2. On the one hand, it can directly utilize the inherent frame structure of the edge of the door body 2 as the duct wall, reducing the use of additional parts; on the other hand, it avoids the problem of the middle of the door body 2 being blocked by the duct, ensuring that the user can clearly observe the food status inside the cooking cavity.

[0054] The technical solution of this utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.

Claims

1. A microwave oven characterized by comprising: The microwave oven includes a body (1) and a door (2) hinged to the body (1). The body (1) is provided with a cooling fan (14) and a first cooling duct (13). The cooling fan (14) is used to promote air circulation in the first cooling duct (13). A second cooling duct (24) is formed in the edge area of ​​the door (2). An image acquisition device (25) is provided in the second cooling duct (24). When the door (2) is closed, the second heat dissipation duct (24) is in airflow communication with the first heat dissipation duct (13), so that the airflow driven by the cooling fan (14) flows through the first heat dissipation duct (13) and the second heat dissipation duct (24) in sequence, so as to dissipate heat from the image acquisition device (25).

2. The microwave oven as claimed in claim 1, wherein The body (1) includes a base (12), the base (12) forms a bottom space (121), the cooling fan (14) and the first cooling duct (13) are disposed in the bottom space (121), the first cooling duct (13) is connected to the bottom space (121), and the bottom space (121) is also provided with a heating element (15), the heating element (15) is arranged on the air intake path of the first cooling duct (13).

3. The microwave oven according to claim 2, characterized in that, The first heat dissipation duct (13) includes a first duct section (131), a second duct section (132), and a third duct section (133) connected in sequence. The first duct section (131) is located on the side of the bottom space (121) away from the door (2) along the width direction of the base (12). The second duct section (132) is located on the side of the bottom space (121) along the length direction. The third duct section (133) is located on the side of the bottom space (121) close to the door (2) along the width direction of the base (12). The first duct section (131) is connected to the bottom space (121). When the door (2) is closed, the third duct section (133) is connected to the second heat dissipation duct (24) in airflow communication.

4. The microwave oven as claimed in claim 3, wherein The second heat dissipation duct (24) includes a fourth duct section (241) and a fifth duct section (242) that are interconnected. The fourth duct section (241) is located on one side of the door body (2) along the length direction of the door body (2). When the door body (2) is closed, the fourth duct section (241) is in airflow communication with the third duct section (133). The fifth duct section (242) is located on the side of the door body (2) away from the base (12) along the width direction of the door body (2).

5. The microwave oven as claimed in claim 1, wherein The air outlet of the first heat dissipation duct (13) is arranged adjacent to the air inlet of the second heat dissipation duct (24). When the door (2) is closed, the air outlet of the first heat dissipation duct (13) and the air inlet of the second heat dissipation duct (24) are directly opposite each other and the airflow is connected.

6. The microwave oven as claimed in claim 1, wherein The microwave oven also includes a telescopic tube, the two ends of which are connected to the air outlet of the first heat dissipation duct (13) and the air inlet of the second heat dissipation duct (24), respectively. When the door (2) is in a closed or open state, the air outlet of the first heat dissipation duct (13) is connected to the air inlet of the second heat dissipation duct (24) through the telescopic pipe.

7. The microwave oven as claimed in claim 1, wherein The door (2) includes a door frame (21) and a metal plate frame (22). The metal plate frame (22) is disposed on the door frame (21). The edge portion of the metal plate frame (22) and the edge portion of the door frame (21) together form the second heat dissipation duct (24).

8. The microwave oven as claimed in claim 7, wherein The air inlet and / or air outlet of the second heat dissipation duct (24) are formed on the outer side of the door frame (21).

9. The microwave oven as claimed in claim 7, wherein The metal frame (22) has a mesh structure for image acquisition by the image acquisition device (25).

10. The microwave oven as claimed in claim 9, wherein The door (2) also includes a heat-insulating glass panel (23), which is disposed on the side of the metal frame (22) near the body (1).

Images