Frequency conversion device heat dissipation structure and microwave oven

Abstract

The utility model relates to the technical field of microwave ovens, and provides a frequency conversion device heat dissipation structure and a microwave oven.The frequency conversion device heat dissipation structure comprises a bottom mounting plate, a first heat dissipation air channel, a first frequency conversion device and a first fan device, and two magnetron assemblies are arranged on the bottom mounting plate; the first frequency conversion device is arranged in the first heat dissipation air channel and communicates with at least one magnetron assembly, and the first fan device is arranged on the bottom mounting plate and can provide cold air for the first heat dissipation air channel. According to the frequency conversion device heat radiation structure of the utility model, the frequency conversion device heat radiation structure of a double-magnetron assembly structure is optimally designed, the structure is compact, the assembly is convenient, heat can be rapidly discharged, the heat radiation reliability of the frequency conversion device is ensured, the problem that the device is easy to overheat during high-power operation is effectively solved, and the service life of the frequency conversion device is prolonged. And the working stability and reliability of the microwave oven are further enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of microwave ovens, in particular to a frequency conversion device heat dissipation structure and a microwave oven. Background Art

[0002] As modern households increasingly demand higher performance from kitchen appliances, microwave ovens, as a common kitchen heating device, are becoming increasingly important for their heating efficiency and uniformity. Traditional microwave ovens typically use a single magnetron as a microwave source, directing microwaves into the oven cavity via a single waveguide to heat food.

[0003] However, this design has the following problems in actual use:

[0004] First, the limited power and microwave radiation range of a single magnetron often results in uneven microwave distribution within the oven cavity. This is particularly true when heating large or irregularly shaped food, where different parts of the food receive noticeable differences in heating, affecting the heating effect. To improve heating uniformity, some microwave ovens use a turntable design that rotates the food to improve heating uniformity. However, this approach increases structural complexity, and the turntable and its transmission components are prone to accumulating food residue, making them difficult to clean and posing certain safety risks.

[0005] Second, as microwave oven power demands increase, individual magnetrons are prone to overheating when operating at high power. This not only shortens the lifespan of the microwave but can also adversely affect food heating. Although some high-end microwave ovens use heat dissipation technology to reduce the operating temperature of the magnetron, this effect is still limited when operating at high power for extended periods.

[0006] Third, the application of frequency conversion technology allows for more flexible adjustment of microwave oven heating power, but this also places higher demands on the inverter's heat dissipation. This is particularly true for dual-magnetron microwave oven projects. Since each magnetron typically requires a separate inverter to control its output power, the number of inverters doubles, significantly increasing the overall heat dissipation load. Traditional heat dissipation designs may not meet the heat dissipation requirements of dual-inverter systems, affecting the stable operation and lifespan of the equipment.

[0007] Therefore, existing microwave ovens still have deficiencies in heating efficiency and uniformity, especially when operating at high power and for extended periods, where heat dissipation is a particularly prominent issue. Therefore, it is necessary to optimize and improve the magnetron configuration, microwave distribution, and heat dissipation system of microwave ovens to enhance their overall performance and user experience. Utility Model Content

[0008] In view of this, the present invention provides a heat dissipation structure of a frequency conversion device and a microwave oven to solve at least one of the above technical problems.

[0009] In order to achieve the above-mentioned purpose, the technical solution of the utility model is achieved as follows:

[0010] The first object of the present application is to disclose a heat dissipation structure of a frequency conversion device, comprising:

[0011] A bottom mounting plate is arranged below the bottom plate of the furnace chamber assembly, and two magnetron assemblies are arranged on the bottom mounting plate;

[0012] a first heat dissipation duct, one end of which is connected to the first fan device and the other end of which extends to the corner of the bottom mounting plate, and air outlets or air outlet grilles are provided on two side surfaces of the first heat dissipation duct near the corner;

[0013] a first frequency conversion device, disposed inside the first heat dissipation duct, for providing high-frequency alternating current to one or both magnetron assemblies;

[0014] The first fan device is arranged on the bottom mounting plate and is used for providing cooling air to the first heat dissipation duct.

[0015] Furthermore, the first fan device is arranged on the bottom mounting plate near the center.

[0016] Furthermore, the first fan device includes a first fan mounting bracket and a first heat dissipation fan, the first heat dissipation fan is detachably fixed to the bottom mounting plate through the first fan mounting bracket, a first air inlet is arranged on the bottom surface of the first heat dissipation fan away from the bottom mounting plate, and a first air outlet is arranged in the lateral direction of the first heat dissipation fan, and the first air outlet extends toward the edge corner of the bottom mounting plate.

[0017] Furthermore, the first heat dissipation duct includes a first duct lower shell plate and a first duct upper shell plate, the first duct lower shell plate and the first duct upper shell plate are detachably fixed, the first duct upper shell plate includes a first circulation portion and a first accommodating portion, the first duct lower shell plate includes a second circulation portion and a second accommodating portion, the first circulation portion and the second circulation portion cooperate to form a cavity connected to the first air outlet for forming airflow, and the first accommodating portion and the second accommodating portion cooperate to form an installation space for accommodating the first frequency conversion device.

[0018] Furthermore, second air outlet grilles and / or second air outlets are respectively provided on the two side edges of the second accommodating portion near the corners, and correspondingly, first air outlet grilles and / or air outlets are respectively provided on the two side edges of the first accommodating portion near the corners.

[0019] Furthermore, a first limiting groove is provided at the connection between the first air duct lower shell plate and the first air duct upper shell plate for plug-in sealing and limiting.

[0020] Furthermore, the magnetron assembly includes a first magnetron assembly and a second magnetron assembly, the first magnetron assembly and the second magnetron assembly are arranged on opposite sides of the space accommodating the first frequency conversion device on the first heat dissipation duct, and the first magnetron assembly and the second magnetron assembly are arranged in the middle position of two adjacent side lines in the air outlet direction on the bottom mounting plate.

[0021] Furthermore, it also includes a second heat dissipation device and a second heat dissipation fan. A second frequency conversion device is arranged inside the second heat dissipation device. The second heat dissipation fan is used to ventilate the interior of the second heat dissipation device and dissipate heat and cool the second frequency conversion device.

[0022] Furthermore, the second heat dissipation device is arranged at a corner position on the rear end of the bottom mounting plate away from the first frequency conversion device, a second air outlet structure is arranged at the rear end of the second heat dissipation device, and the second heat dissipation fan is arranged at the front end of the second heat dissipation device.

[0023] Compared with the prior art, the heat dissipation structure of the frequency converter described in the present invention has the following advantages:

[0024] (1) The heat dissipation structure of the frequency converter described in the present invention accelerates the convection and dissipation of heat by optimizing the installation position and structure of the first heat dissipation duct, and also realizes rapid heat discharge through the air outlets at the corners, thereby avoiding local overheating, significantly improving the heat dissipation efficiency of the first frequency converter, reducing the temperature rise during operation, and extending the service life of the equipment.

[0025] (2) The heat dissipation structure of the frequency converter described in the present invention is optimized for the heat dissipation structure of the frequency converter with a dual magnetron assembly structure. It has a compact structure and is easy to assemble. It achieves rapid heat dissipation, ensures the heat dissipation reliability of the frequency converter, effectively solves the problem of equipment overheating during high-power operation, and further enhances the working stability and reliability of the microwave oven.

[0026] Another object of the present invention is to provide a microwave oven, comprising a cavity assembly, a door assembly and a shell assembly, wherein the door assembly is arranged at the front end of the cavity assembly and can open or cover its opening, and the bottom of the cavity assembly is provided with a heat dissipation structure of the frequency conversion device as described above.

[0027] The microwave oven described in the present application optimizes the heat dissipation structure of the frequency converter of the dual magnetron assembly within the microwave oven structure, and through reasonable air duct layout and bottom plate position setting, greatly improves the heat dissipation efficiency of the microwave oven, effectively solves the problem of the frequency converter easily overheating during operation of the microwave oven, reduces the temperature of the frequency converter during operation, extends its service life, and improves the operating stability and reliability of the microwave oven. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0029] Figure 1 This is a schematic diagram of the explosion structure of the microwave oven according to an embodiment of the present utility model;

[0030] Figure 2 for Figure 1 The middle structure shows the schematic diagram of the heat dissipation structure of the frequency converter;

[0031] Figure 3 This is a structural diagram of the heat dissipation structure of the frequency conversion device according to an embodiment of the present utility model being arranged at the bottom of the furnace cavity assembly;

[0032] Figure 4 for Figure 3 A schematic structural diagram of the structure shown from a second viewing angle;

[0033] Figure 5 for Figure 4 Schematic diagram of local structure explosion;

[0034] Figure 6 This is a schematic diagram of the partially exploded structure of the first heat dissipation duct and the first fan device according to an embodiment of the present utility model;

[0035] Figure 7 This is a structural schematic diagram of the second heat dissipation device according to an embodiment of the present utility model;

[0036] Figure 8 This is a schematic diagram of a partial explosion structure of the second heat dissipation device according to an embodiment of the present utility model;

[0037] Description of reference numerals:

[0038] 100-furnace chamber assembly; 200-door sealing assembly; 300-housing assembly; 301-U-shaped housing; 302-bottom plate housing; 1-first magnetron assembly; 2-second magnetron assembly; 3-first cooling duct; 4-first fan device; 5-bottom mounting plate; 6-first duct lower shell plate; 7-first frequency conversion device; 8-first duct upper shell plate; 9-first fan mounting bracket; 10-first cooling fan; 1001-first air inlet; 1002-first air outlet; 11-first circulation portion; 12-first accommodating portion; 1 201-first boss; 1202-first air outlet grille; 13-second circulation portion; 14-second accommodating portion; 1401-second air outlet grille; 1402-second air outlet; 1403-first buckle; 1404-first limiting groove; 15-second heat dissipation device; 16-second air duct upper shell plate; 17-second frequency conversion device; 18-second air duct lower shell plate; 19-second accommodating slot; 20-third air outlet; 21-third air outlet grille; 22-second limiting groove; 23-second heat dissipation fan; 24-waveguide box assembly. DETAILED DESCRIPTION

[0039] In order to make the technical means, objectives and effects of the present invention easier to understand, embodiments of the present invention are described in detail below with reference to specific drawings.

[0040] It should be noted that all terms used in this utility model to indicate direction and position, such as "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "inside", "outside", "top", "low", "lateral", "longitudinal", "center", etc., are only used to explain the relative positional relationship and connection status between the various components in a certain specific state (as shown in the accompanying drawings). They are only for the convenience of describing this utility model, and do not require that the utility model must be constructed and operated in a specific orientation. Therefore, they cannot be understood as limiting the utility model. In addition, the descriptions of "first", "second", etc. in this utility model are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated.

[0041] In the description of this utility model, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections; they can refer to direct connections, indirect connections through an intermediary, or internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0042] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the illustrative use of the above terms does not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0043] like Figures 1 to 8 As shown, the utility model discloses a heat dissipation structure of a frequency conversion device, comprising:

[0044] A bottom mounting plate 5 is provided below the bottom plate of the furnace chamber assembly 100 , and two magnetron assemblies are provided on the bottom mounting plate 5 ;

[0045] A first heat dissipation duct 3, one end of which is connected to the first fan device 4 and the other end of which extends to the corner of the bottom mounting plate 5, and air outlets or air outlet grilles are provided on two side surfaces of the first heat dissipation duct 3 near the corner;

[0046] A first frequency conversion device 7 is provided inside the first heat dissipation duct 3 and is used to provide high-frequency alternating current to one or both magnetron assemblies;

[0047] The first fan device 4 is arranged near the center of the bottom mounting plate 5 and is used to provide cooling air to the first heat dissipation duct 3 .

[0048] The present application discloses a heat dissipation structure of a frequency conversion device, which is provided by arranging a bottom mounting plate 5 below the bottom plate of a furnace chamber assembly 100, and configuring two magnetron assemblies on the bottom mounting plate 5, namely a first magnetron assembly 1 and a second magnetron assembly 2, and combining the optimized designed first heat dissipation duct 3 and the first fan device 4, a first frequency conversion device 7 that provides stable high-frequency alternating current to at least one magnetron assembly is placed inside the first heat dissipation duct 3, and the first fan device 4 located near the center of the bottom mounting plate 5 is responsible for blowing cold air into the first heat dissipation duct 3 to form an effective heat dissipation airflow. One end of the first heat dissipation duct 3 is connected to the first fan device 4, and the other end extends to the edge and corner position of the bottom mounting plate 5, and air outlets or air outlet grilles are provided on both side surfaces near the edge and corner, thereby forming a two-directional heat dissipation air outlet flow channel, so that the hot air can be discharged in time to avoid heat accumulation inside the device, thereby ensuring that the first frequency conversion device 7 and the magnetron assembly can operate efficiently in a suitable temperature environment.

[0049] The heat dissipation structure of the frequency conversion device described in the present application not only accelerates the convection and dissipation of heat by optimizing the installation position and structure of the first heat dissipation duct 3 and the first fan device 4, but also realizes rapid heat discharge through the air outlets at the corner positions, thereby avoiding local overheating, significantly improving the heat dissipation efficiency of the first frequency conversion device 7, reducing the temperature rise during operation, extending the service life of the equipment, simplifying the structure, and improving the working stability and safety of the microwave oven.

[0050] As a preferred example of the present application, the magnetron assembly includes a first magnetron assembly 1 and a second magnetron assembly 2, which are respectively arranged on two side surfaces of the bottom mounting plate 5 near the air outlet or air outlet grille. This arrangement further optimizes the installation position of the magnetron assembly in the dual-magnetron microwave oven structure, arranging the two magnetron assemblies on opposite sides of the first heat dissipation duct 3. This facilitates optimizing the integrated or independent design of the variable frequency structure of the magnetron assembly, resulting in a compact structure. It also avoids the magnetron assembly structure from affecting the installation position of the first heat dissipation duct 3, extends the structural length of the first heat dissipation duct 3, reduces the airflow resistance within the heat dissipation duct, and enables smoother flow of cold air, further improving the heat dissipation effect and providing users with a more durable and reliable product experience.

[0051] As a preferred example of the present application, the first fan device 4 includes a first fan mounting bracket 9 and a first heat dissipation fan 10. The first heat dissipation fan 10 is detachably fixed to the bottom mounting plate 5 through the first fan mounting bracket 9. A first air inlet 1001 is arranged on the bottom surface of the first heat dissipation fan 10 away from the bottom mounting plate 5. A first air outlet 1002 is arranged in the lateral direction of the first heat dissipation fan 10. The first air outlet 1002 extends toward the corner of the bottom mounting plate 5. The first cooling fan 10 is detachably fixed to the bottom mounting plate 5 through the first fan mounting bracket 9. This not only facilitates the installation and maintenance of the fan, but also ensures the stable operation of the fan. At the same time, it is convenient to form a first air inlet 1001 on the side of the first cooling fan 10 away from the mounting structure, and forms a first air outlet 1002 in the lateral direction of its structure for discharging air toward the corner of the bottom mounting plate 5. When the first cooling fan 10 is working, it converts the inhaled fresh air into cold air, and then blows it toward the first cooling duct 3 through the first air outlet 1002 to dissipate heat to the first frequency conversion device 7 and other heating components inside it, thereby effectively taking away heat, improving its working stability and safety, and having a compact structure and easy maintenance.

[0052] As a preferred example of the present application, the first heat dissipation duct 3 includes a first duct lower shell plate 6 and a first duct upper shell plate 8, the first duct lower shell plate 6 and the first duct upper shell plate 8 are detachably fixed, the first duct upper shell plate 8 includes a first circulation portion 11 and a first accommodating portion 12, the first duct lower shell plate 6 includes a second circulation portion 13 and a second accommodating portion 14, the first circulation portion 11 and the second circulation portion 13 cooperate to form a cavity connected to the first air outlet 1002 for forming airflow, the first accommodating portion 12 and the second accommodating portion 14 cooperate to form an installation space for accommodating the first frequency conversion device 7. As a preferred example of the present application, the first duct lower shell plate 6 and the first duct upper shell plate 8 are connected by a plurality of mutually cooperating first bosses 1201 and first buckles 1403, the first boss 1201 is provided on one of the first duct lower shell plate 6 and the first duct upper shell plate 8, and the corresponding first buckle 1403 is provided on the other component. As a specific example of the present application, the first boss 1201 is provided on the first accommodation portion 12 of the first air duct upper shell plate 8 , and the first clip 1403 is provided on the second accommodation portion 14 of the first air duct lower shell plate 6 .

[0053] This arrangement further optimizes the structure of the first heat dissipation duct 3, ensures smooth airflow, and improves heat dissipation efficiency. Moreover, through the detachable design, maintenance and replacement of the first frequency conversion device 7 become easier, the connection is stable, and the assembly is convenient, thereby achieving efficient heat dissipation and convenient maintenance of the heat dissipation duct.

[0054] As a preferred example of the present application, second air outlet grilles 1401 and / or second air outlets 1402 are respectively provided on the two side edges near the corners of the second accommodating portion 14, and correspondingly, first air outlet grilles 1202 and / or air outlet holes are respectively provided on the two side edges near the corners of the first accommodating portion 12. As a specific example of the present application, the first air duct lower shell plate 6 is provided on the bottom mounting plate 5, the first air duct upper shell plate 8 is provided on the side of the first air duct lower shell plate 6 away from the bottom mounting plate 5, the second air outlet grilles 1401 and the second air outlet 1402 are respectively provided on the two side edges of the second accommodating portion 14 on the first air duct lower shell plate 6, the air outlet direction of the second air outlet grille 1401 is perpendicular to the air outlet direction of the second air outlet 1402, and correspondingly, a first air outlet grille 1202 is respectively provided on the two side edges of the first accommodating portion 12 on the first air duct upper shell plate 8, and the air outlet directions of the two first air outlet grilles 1202 are vertically provided.

[0055] This configuration discloses the specific outlet structure of the first cooling duct 3, allowing the dissipated air to circulate outward in two directions, achieving a more optimized airflow distribution within the first cooling duct 3. The two vertical outlet directions, working together, not only enhance the uniformity of air circulation but also effectively avoid dead spots, improving overall ventilation. Furthermore, by providing one or two outlet structures on the second accommodating portion 14 near the bottom mounting plate 5, the outlet area of ​​the first cooling duct 3 can be further increased, helping to expel heat more quickly and thus improving heat dissipation efficiency.

[0056] As a preferred example of the present application, a first limiting groove 1404 is provided at the connection between the first air duct lower shell plate 6 and the first air duct upper shell plate 8 for plug-in sealing and limiting. As a specific example of the present application, the first limiting groove 1404 is provided on the first air duct lower shell plate 6 and extends from the end of the second circulation portion 13 to the circumferential position of the opening of the second accommodating portion 14. The open end edge of the first air duct upper shell plate 8 extends into the second accommodating portion 14 of the first air duct lower shell plate 6 and is then connected by a plurality of first clips 1403 and the first boss 1201.

[0057] This setting effectively seals and limits the connection between the first air duct lower shell plate 6 and the first air duct upper shell plate 8 through the optimized design of the first limiting groove 1404, thereby improving the sealing performance of the air duct, reducing air leakage, and enhancing the structural strength of the air duct, making it more stable and reliable during use.

[0058] As a preferred example of the present application, the first magnetron assembly 1 and the second magnetron assembly 2 are arranged on opposite sides of the space accommodating the first frequency conversion device 7 on the first heat dissipation duct 3, and the first magnetron assembly 1 and the second magnetron assembly 2 are arranged in the middle of two adjacent side lines in the air outlet direction on the bottom mounting plate 5. In the example of the present application, the first magnetron assembly 1 is arranged on the side of the second accommodating portion 14 away from the second air outlet 1402, the second magnetron assembly 2 is arranged on the side of the second accommodating portion 14 away from the second air outlet grille 1401, and the first magnetron assembly 1 and the second magnetron assembly 2 are arranged in the middle of two side lines on the bottom mounting plate 5, and the first magnetron assembly 1 and the second magnetron assembly 2 are both connected to the waveguide box assembly 24.

[0059] This setting helps ensure the stable operation of the magnetron components, reduces mutual interference between magnetron components, and improves the operating stability and reliability of the microwave oven. In addition, it avoids heat dissipation problems caused by the dense layout of components, simplifies the overall structure, facilitates installation and maintenance, and further improves the performance and heat dissipation efficiency of the microwave oven.

[0060] As a preferred example of the present application, the frequency conversion device heat dissipation structure described in the present application also includes a second heat sink 15 and a second heat dissipation fan 23. A second frequency conversion device 17 is disposed within the second heat sink 15. The second heat dissipation fan 23 is used to ventilate the interior of the second heat sink 15 and dissipate heat and cool the second frequency conversion device 17. This configuration discloses a structure in which dual frequency conversion devices are independently configured for heat dissipation. The two frequency conversion devices are respectively connected to two magnetron assemblies. This not only avoids the problem of insufficient heat dissipation that may exist with a single frequency conversion device, but also achieves precise control and independent heat dissipation of the two magnetron assemblies. In addition, this independent heat dissipation structure also helps reduce thermal interference between devices, further improving the operating efficiency of the microwave oven and the user experience.

[0061] As a preferred example of the present application, the second heat dissipation device 15 is arranged on the side of the second magnetron assembly 2 away from the second accommodating portion 14, a second air outlet structure is arranged at the rear end of the second heat dissipation device 15, and the second heat dissipation fan 23 is arranged at the front end of the second heat dissipation device 15. In the example of the present application, the accommodating space of the first frequency conversion device 7 and the second heat dissipation device 15 are respectively arranged at the two corner positions at the rear end of the bottom mounting plate 5, and the second heat dissipation device 15 includes a second air duct upper shell plate 16 and a second air duct lower shell plate 18. The second air duct upper shell plate 16 and the second air duct lower shell plate 18 are detachably connected to form a second accommodating groove 19 for installing and accommodating the second frequency conversion device 17. A third air outlet grille 21 is arranged at the rear end of the second air duct upper shell plate 16, a third air outlet 20 is arranged at the rear end of the second air duct lower shell plate 18, and a second limiting groove 22 for plugging and limiting is provided at the connection between the second air duct upper shell plate 16 and the second air duct lower shell plate 18.

[0062] This arrangement further optimizes the installation position and structure of the second heat dissipation device 15. By arranging the second heat dissipation device 15 at another corner position of the bottom mounting plate 5 and configuring a dedicated heat dissipation fan and air outlet structure, independent and efficient heat dissipation of the second frequency conversion device 17 is achieved. The structural design concept of the second heat dissipation device 15 is consistent with the structural design concept of the first heat dissipation duct 3, which facilitates installation and maintenance and enhances the stability and reliability of the structure.

[0063] The present application also discloses a microwave oven, including an oven cavity assembly 100, a door sealing assembly 200 and a shell assembly 300. The door sealing assembly 200 is arranged at the front end of the oven cavity assembly 100 and can open or cover its opening. The bottom of the oven cavity assembly 100 is provided with a heat dissipation structure of the frequency conversion device as described in the above embodiment.

[0064] As a preferred example of the present application, the shell assembly 300 includes a U-shaped shell 301 and a bottom plate shell 302. The U-shaped shell 301 and the bottom plate shell 302 are arranged in a U-shaped cover on the outside of the furnace cavity assembly 100, and the bottom plate shell 302 is located below the first heat dissipation duct 3 and the second heat dissipation device 15.

[0065] The microwave oven described in the present application optimizes the heat dissipation structure of the frequency converter of the dual magnetron assembly within the microwave oven structure, and through reasonable air duct layout and bottom plate position setting, greatly improves the heat dissipation efficiency of the microwave oven, effectively solves the problem of the frequency converter easily overheating during operation of the microwave oven, reduces the temperature of the frequency converter during operation, extends its service life, and improves the operating stability and reliability of the microwave oven.

[0066] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A heat dissipation structure of a frequency conversion device, characterized in that: include: A bottom mounting plate (5) is arranged below the bottom plate of the furnace chamber assembly (100), and two magnetron assemblies are arranged on the bottom mounting plate (5); A first heat dissipation duct (3), one end of which is connected to the first fan device (4), and the other end of which extends to the corner of the bottom mounting plate (5), and air outlets or air outlet grilles are provided on two side surfaces of the first heat dissipation duct (3) near the corner; A first frequency conversion device (7) is arranged inside the first heat dissipation duct (3) and is used to provide high-frequency alternating current to one magnetron assembly or both magnetron assemblies; The first fan device (4) is arranged on the bottom mounting plate (5) and is used to provide cooling air to the first heat dissipation duct (3).

2. The heat dissipation structure of the frequency converter according to claim 1, characterized in that: The first fan device (4) is arranged on the bottom mounting plate (5) at a position close to the center.

3. The heat dissipation structure of the frequency converter according to claim 1, characterized in that: The first fan device (4) comprises a first fan mounting bracket (9) and a first heat dissipation fan (10); the first heat dissipation fan (10) is detachably fixed to the bottom mounting plate (5) via the first fan mounting bracket (9); a first air inlet (1001) is provided on the bottom surface of the first heat dissipation fan (10) away from the bottom mounting plate (5); a first air outlet (1002) is provided in a lateral direction of the first heat dissipation fan (10); and the first air outlet (1002) is extended in the direction of the corner of the bottom mounting plate (5).

4. The heat dissipation structure of the frequency converter according to claim 1, characterized in that: The first heat dissipation duct (3) includes a first duct lower shell plate (6) and a first duct upper shell plate (8), the first duct lower shell plate (6) and the first duct upper shell plate (8) are detachably fixed, the first duct upper shell plate (8) includes a first circulation portion (11) and a first accommodating portion (12), the first duct lower shell plate (6) includes a second circulation portion (13) and a second accommodating portion (14), the first circulation portion (11) and the second circulation portion (13) cooperate to form a cavity connected to the first air outlet (1002) for forming air flow, and the first accommodating portion (12) and the second accommodating portion (14) cooperate to form an installation space for accommodating the first frequency conversion device (7).

5. The heat dissipation structure of the frequency converter according to claim 4, characterized in that: A second air outlet grille (1401) and / or a second air outlet (1402) are respectively provided on two side edges close to the corners of the second accommodating portion (14); correspondingly, a first air outlet grille (1202) and / or an air outlet are respectively provided on two side edges close to the corners of the first accommodating portion (12).

6. The heat dissipation structure of the frequency conversion device according to claim 4, characterized in that: A first limiting groove (1404) is provided at the connection between the first air duct lower shell plate (6) and the first air duct upper shell plate (8) for plug-in sealing and limiting.

7. The heat dissipation structure of the frequency converter according to claim 1, characterized in that: The magnetron assembly comprises a first magnetron assembly (1) and a second magnetron assembly (2), wherein the first magnetron assembly (1) and the second magnetron assembly (2) are arranged on opposite sides of a space accommodating a first frequency conversion device (7) on the first heat dissipation air duct (3), and the first magnetron assembly (1) and the second magnetron assembly (2) are arranged at the middle position of two adjacent side lines in the air outlet direction on the bottom mounting plate (5).

8. The heat dissipation structure of a frequency converter according to any one of claims 1 to 7, characterized in that: The device further comprises a second heat dissipation device (15) and a second heat dissipation fan (23). A second frequency conversion device (17) is provided inside the second heat dissipation device (15). The second heat dissipation fan (23) is used to ventilate the interior of the second heat dissipation device (15) and dissipate heat and cool the second frequency conversion device (17).

9. The heat dissipation structure of the frequency conversion device according to claim 8, characterized in that: The second heat dissipation device (15) is arranged at a corner position on the rear end of the bottom mounting plate (5) away from the first frequency conversion device (7), a second air outlet structure is arranged at the rear end of the second heat dissipation device (15), and the second heat dissipation fan (23) is arranged at the front end of the second heat dissipation device (15).

10. A microwave oven, characterized in that: The invention comprises a furnace chamber assembly (100), a door sealing assembly (200) and a shell assembly (300), wherein the door sealing assembly (200) is arranged at the front end of the furnace chamber assembly (100) and can open or seal its opening, and the bottom of the furnace chamber assembly (100) is provided with a heat dissipation structure of a frequency conversion device as claimed in any one of claims 1 to 9.

Images