Microwave cooking utensil

Abstract

The utility model provides a microwave cooking utensil and relates to the technical field of microwave cooking, the microwave cooking utensil comprises a utensil main body, a frequency converter, a power panel and a cooling fan, a cooking space is formed in the utensil main body, and the utensil main body is provided with a first air duct and a second air duct which are arranged side by side and isolated from each other; the frequency converter is arranged in the first air duct; the power panel is arranged in the second air duct; the cooling fan is arranged on the appliance body, and an air outlet of the cooling fan faces the first inlet of the first air channel and the second inlet of the second air channel. According to the technical scheme, the heat dissipation problem of the frequency converter and the power panel in the microwave cooking utensil can be solved, and the situation that the microwave cooking utensil is too large in size and operation noise is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of microwave cooking appliances, and particularly relates to a microwave cooking appliance. Background Art

[0002] In microwave cooking appliances that use microwave energy for cooking, such as microwave ovens and microwave rice cookers, an inverter is usually provided to drive the magnetron to work; and when the inverter is working, a large temperature rise will occur, and the power supply board provided in the microwave cooking appliance will also heat up. Therefore, it is necessary to dissipate heat from the inverter and the power supply board simultaneously to ensure stable working performance. If two fans or other two sets of heat dissipation structures are respectively used to dissipate heat from the inverter and the power supply board, it is easy to increase the volume and operating noise of the microwave cooking appliance. Summary of the Utility Model

[0003] The main object of the utility model is to provide a microwave cooking appliance, aiming to solve the heat dissipation problems of the inverter and the power supply board in the microwave cooking appliance, and avoid excessive volume and operating noise of the microwave cooking appliance.

[0004] To achieve the above object, a microwave cooking appliance proposed by the utility model includes:

[0005] An appliance main body, in which a cooking space is formed, and a first air duct and a second air duct which are arranged side by side and isolated from each other are provided;

[0006] An inverter, which is arranged in the first air duct;

[0007] A power supply board, which is arranged in the second air duct; and

[0008] A heat dissipation fan, which is arranged on the appliance main body, and the air outlet of the heat dissipation fan faces the first inlet of the first air duct and the second inlet of the second air duct.

[0009] In an embodiment of the present application, the opening area of the first inlet is larger than the opening area of the second inlet.

[0010] In an embodiment of the present application, between the opening area S of the first inlet and the opening area s of the second inlet, 2s ≤ S ≤ 5s is satisfied.

[0011] In an embodiment of the present application, the side walls of the first air duct and the second air duct are arranged at intervals.

[0012] In an embodiment of the present application, the appliance main body includes a pot body, a lid body and a mounting base;

[0013] The cooking space is formed in the pot body, and the lid body can be opened and closed to cover the pot body;

[0014] The mounting base is provided on the pot body and forms a heat dissipation space. The first air duct and the second air duct are formed in the heat dissipation space, and the heat dissipation fan is provided in the heat dissipation space.

[0015] In an embodiment of the present application, the mounting base includes a base body and a cover body. The base body is provided with the heat dissipation space. The cover body includes:

[0016] A fan cover shell, the fan cover shell forms a mounting hole, and the first inlet and the second inlet are arranged at intervals along the circumferential direction on the hole wall of the mounting hole. The heat dissipation fan is provided in the mounting hole;

[0017] A first cover shell, the first cover shell is connected to the part of the fan cover shell where the first inlet is formed. The first cover shell covers the bottom wall of the heat dissipation space to enclose and form the first air duct. One end of the first cover shell away from the first inlet is provided with a first outlet;

[0018] A second cover shell, the second cover shell is connected to the part of the fan cover shell where the second inlet is formed. The second cover shell covers the bottom wall of the heat dissipation space to enclose and form the second air duct. One end of the second cover shell away from the second inlet is provided with a second outlet.

[0019] In an embodiment of the present application, the mounting base is provided with a bottom cover. The bottom cover covers the opening of the heat dissipation space and is provided with an air flow inlet and an air flow outlet. The air flow inlet is arranged towards the heat dissipation fan, and the air flow outlet is located at one end of the first air duct and the second air duct away from the heat dissipation fan.

[0020] In an embodiment of the present application, the distance between the frequency converter and the air outlet of the heat dissipation fan is less than the distance between the frequency converter and the air flow outlet.

[0021] In an embodiment of the present application, the distance between the frequency converter and the air outlet of the heat dissipation fan is D, and the distance between the frequency converter and the air flow outlet is d, satisfying 2D ≤ d ≤ 4D.

[0022] In an embodiment of the present application, the air outlet of the heat dissipation fan includes a first air outlet and a second air outlet. The first air outlet is arranged towards the first inlet, and the second air outlet is arranged towards the second inlet.

[0023] In an embodiment of the present application, the heat dissipation fan is a centrifugal fan, including a volute and an impeller provided in the volute. The volute forms an air duct, and the outer wall of the volute tongue of the volute is provided with the first air outlet and the second air outlet communicating with the air duct.

[0024] The technical solution of the present utility model is to set a first air duct and a second air duct in the appliance body, arrange the frequency converter and the power supply board in the first air duct and the second air duct respectively, and set the air outlet of the cooling fan to face the first inlet and the second inlet at the same time, so that the air flow blown by the cooling fan can enter the first air duct and the second air duct respectively to cool the frequency converter and the power supply board; with such a setting, there is no need to set two fans in the microwave cooking appliance to drive the air flow to cool the frequency converter and the power supply board respectively, so as to avoid the over-large volume of the microwave cooking appliance and the relatively high noise during the operation of the microwave cooking appliance. In addition, the first air duct and the second air duct are isolated from each other, which can prevent the heat generated by the frequency converter and the power supply board from affecting each other, avoid overheating of the frequency converter and the power supply board, and ensure the stable performance of the frequency converter and the power supply board; at the same time, it can avoid the increase of air resistance caused by the relatively complex structure in the same air duct and affect the air flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0026] Figure 1 It is a structural diagram of an embodiment of the microwave cooking appliance of the present application;

[0027] Figure 2 It is Figure 1 a partial cross-sectional view of the first air duct at A-A' in

[0028] Figure 3 It is a structural diagram of the microwave cooking appliance of the present application with the bottom cover removed;

[0029] Figure 4 It is Figure 3 a schematic diagram of the microwave cooking appliance in with the cooling fan, the cover body and part of the cooking pot body removed;

[0030] Figure 5 It is Figure 4 a front view of ;

[0031] Figure 6 It is a structural diagram of an embodiment of the cover body in the microwave cooking appliance of the present application;

[0032] Figure 7 It is Figure 6 a structural diagram of another perspective of the cover body in ;

[0033] Figure 8 It is a comparison view of the first inlet and the second inlet in an embodiment of the microwave cooking appliance of the present application;

[0034] Figure 9 This is the structural diagram of the volute in an embodiment of the heat dissipation fan in the microwave cooking appliance of the present application;

[0035] Figure 10 This is the mating view of the frequency converter, power supply board, heat dissipation fan and bottom cover in an embodiment of the microwave cooking appliance of the present application.

[0036] Explanation of the reference numerals in the drawings:

[0037] Label Name Label Name 100 Microwave cooking appliance 1553 First outlet 10 Appliance body 157 Second air duct 11 Pot body 1571 Second inlet 13 Cover body 1573 Second outlet 15 Mounting seat 158 Spacer area 151 Seat body 159 Bottom cover 1511 Heat dissipation space 1591 Air flow inlet 153 Hood body 1593 Air flow outlet 1531 Fan hood 30 Frequency converter 1532 First hood 50 Power supply board 1533 Second hood 70 Heat dissipation fan 1534 Mounting hole 71 Volute 155 First air duct 73 First air outlet 1551 First inlet 75 Second air outlet

[0038] The realization of the object, functional features and advantages of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0039] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0040] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0041] In the present utility model, unless otherwise clearly defined and limited, the terms "connection", "fixation" and the like shall be understood in a broad sense. For example, "fixation" may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0042] In addition, in the present utility model, descriptions such as "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments may be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0043] The present utility model provides a microwave cooking appliance 100.

[0044] With reference to Figures 1 to 4 , in some embodiments of the present application, the microwave cooking appliance 100 includes an appliance main body 10, an inverter 30, a power supply board 50, and a cooling fan 70. A cooking space is formed in the appliance main body 10, and a first air duct 155 and a second air duct 157 which are arranged side by side and isolated from each other are provided. The inverter 30 is disposed in the first air duct 155; the power supply board 50 is disposed in the second air duct 157; the cooling fan 70 is disposed on the appliance main body 10, and the air outlet of the cooling fan 70 is arranged facing the first inlet 1551 of the first air duct 155 and the second inlet 1571 of the second air duct 157.

[0045] The microwave cooking appliance 100 proposed in the embodiments of the present application may be a microwave rice cooker, a microwave oven, etc. When the microwave cooking appliance 100 is a microwave rice cooker, the appliance main body 10 may include a pot body 11, a magnetron, etc. A cooking space is formed in the pot body 11, and the magnetron can generate microwaves and use a waveguide to transmit the microwaves into the cooking space for cooking food. The appliance main body 10 serves as a carrying main body, and an inverter 30, a power supply board 50, etc. are also provided thereon. The inverter 30 can be used to drive the magnetron to operate, and the power supply board 50 is electrically connected to devices such as the magnetron to provide electrical energy for the appliance main body 10.

[0046] Meanwhile, in the present application, a first air duct 155 and a second air duct 157 are provided on the appliance main body 10. A frequency converter 30 is provided in the first air duct 155, and a power supply board 50 is provided in the second air duct 157. The air outlet of the cooling fan 70 is communicated with the first inlet 1551 of the first air duct 155 and the second inlet 1571 of the second air duct 157 at the same time. Among them, the air outlet of the cooling fan 70 can cover the first inlet 1551 and the second inlet 1571 at the same time, or two air outlets can be provided on the cooling fan 70 in the following embodiments to respectively face the first inlet 1551 and the second inlet 1571. At this time, the air flow blown out by the cooling fan 70 can respectively enter the first air duct 155 and the second air duct 157 to cool the frequency converter 30 and the power supply board 50; with such a setting, there is no need to provide two fans in the microwave cooking appliance 100 to respectively drive the air flow to cool the frequency converter 30 and the power supply board 50, so as to avoid the microwave cooking appliance 100 from being too large in volume and avoid the microwave cooking appliance 100 from generating a large amount of noise during operation. In addition, the first air duct 155 and the second air duct 157 are isolated from each other, which can prevent the heat generated by the frequency converter 30 and the power supply board 50 from affecting each other, prevent the frequency converter 30 and the power supply board 50 from overheating, and ensure the stable performance of the frequency converter 30 and the power supply board 50; at the same time, it is avoided that the frequency converter 30 and the power supply board 50 are arranged in the same air duct, resulting in a more complex structure in the air duct and an increase in air resistance, which affects the air flow.

[0047] Therefore, it can be understood that in the technical solution of the present application, by providing the first air duct 155 and the second air duct 157 in the appliance main body 10, the frequency converter 30 and the power supply board 50 are respectively arranged in the first air duct 155 and the second air duct 157, and the air outlet of the cooling fan 70 is arranged to face the first inlet 1551 and the second inlet 1571 at the same time, so that the air flow blown out by the cooling fan 70 can respectively enter the first air duct 155 and the second air duct 157 to cool the frequency converter 30 and the power supply board 50; with such a setting, there is no need to provide two fans in the microwave cooking appliance 100 to respectively drive the air flow to cool the frequency converter 30 and the power supply board 50, so as to avoid the microwave cooking appliance 100 from being too large in volume and avoid the microwave cooking appliance 100 from generating a large amount of noise during operation. In addition, the first air duct 155 and the second air duct 157 are isolated from each other, which can prevent the heat generated by the frequency converter 30 and the power supply board 50 from affecting each other, prevent the frequency converter 30 and the power supply board 50 from overheating, and ensure the stable performance of the frequency converter 30 and the power supply board 50; at the same time, it is avoided that the frequency converter 30 and the power supply board 50 are arranged in the same air duct, resulting in a more complex structure in the air duct and an increase in air resistance, which affects the air flow.

[0048] Please refer to Figure 8 , in some embodiments of the present application, the opening area of the first inlet 1551 is larger than the opening area of the second inlet 1571.

[0049] When the microwave cooking appliance 100 is operating, the heat generated by the power supply board 50 is lower than that generated by the frequency converter 30. In this embodiment, the opening area of the first inlet 1551 of the first air duct 155 is made larger than the opening area of the second inlet 1571 of the second air duct 157. With such a setting, the air flow blown by the cooling fan 70 can be split such that the air flow diverted to the first air duct 155 is more than the air flow diverted to the second air duct 157, making the air flow distribution in the first air duct 155 and the second air duct 157 correspond to the heat generated by the frequency converter 30 and the power supply board 50, so that more air flows into the first air duct 155 to cool the frequency converter 30, and the remaining part of the air flow flows into the second air duct 157 to cool the power supply board 50. Thus, it is possible to avoid a low cooling efficiency of the frequency converter 30 due to insufficient air volume flowing into the first air duct 155, and it is also possible to avoid waste of air flow caused by excessive air flow flowing into the second air duct 157, thereby achieving the purpose of using the same cooling fan 70 to simultaneously meet the cooling requirements of the frequency converter 30 and the power supply board 50, and ensuring that both the frequency converter 30 and the power supply board 50 have a high cooling efficiency.

[0050] In some embodiments of the present application, between the opening area S of the first inlet 1551 and the opening area s of the second inlet 1571, 2s ≤ S ≤ 5s is satisfied.

[0051] In actual use, the heat generated by the power supply board 50 is about 1 / 5 to 1 / 2 of the heat generated by the frequency converter 30. In this embodiment, making 2s ≤ S ≤ 5s between the opening area S of the first inlet 1551 and the opening area s of the second inlet 1571, the first inlet 1551 and the second inlet 1571 with a suitable opening area ratio can be set according to the model categories and heat generation conditions of the actually used frequency converter 30 and power supply board 50, so as to adjust the air flow diverted to the first air duct 155 and the second air duct 157 by adjusting the area ratio, to ensure that both the frequency converter 30 and the power supply board 50 have a high cooling efficiency. Among them, the ratio of the opening area S of the first inlet 1551 to the opening area s of the second inlet 1571 can satisfy 2, 3, 4, 5 or any value between 2 and 5, which is not limited here.

[0052] Please refer to Figure 3 , in some embodiments of the present application, the side walls of the first air duct 155 and the second air duct 157 are spaced apart.

[0053] It can be understood that in the embodiments of the present application, the first air duct 155 and the second air duct 157 which are isolated from each other are provided, so as to avoid the mutual transfer and influence of the heat generated by the frequency converter 30 and the power supply board 50, and avoid the excessive temperature rise of the frequency converter 30 and the power supply board 50 caused by the heat accumulation, which affects the working performance. In this embodiment, the side walls of the first air duct 155 and the second air duct 157 are arranged at intervals, so that the interval area 158 between the first air duct 155 and the second air duct 157 can be used to increase the thermal resistance, reduce the heat transfer between the first air duct 155 and the second air duct 157, further avoid the mutual transfer and influence of the heat generated by the frequency converter 30 and the power supply board 50, and ensure the stable performance of the frequency converter 30 and the power supply board 50.

[0054] With reference to Figure 1 、 Figure 3 and Figure 4 In some embodiments of the present application, the appliance main body 10 includes a pot body 11, a lid body 13 and a mounting seat 15; a cooking space is formed in the pot body 11, and the lid body 13 is pivotally covered on the pot body 11; the mounting seat 15 is arranged on the pot body 11 and forms a heat dissipation space 1511, the first air duct 155 and the second air duct 157 are formed in the heat dissipation space 1511, and the heat dissipation fan 70 is arranged in the heat dissipation space 1511.

[0055] In this embodiment, the appliance main body 10 includes a pot body 11, a lid body 13 and a mounting seat 15. Among them, the pot body 11 and the lid body 13 are combined to form a main structure. The pot body 11 forms a cooking space. The cooking space can be open at the top or at the side. Correspondingly, the lid body 13 is covered on the top or side of the pot body 11 to cover the cooking space. The mounting seat 15 is arranged on the pot body 11 and can be arranged at the bottom of the pot body 11 or at the side of the pot body 11; the mounting seat 15 is used to carry and fix structures such as the heat dissipation fan 70, the frequency converter 30 and the power supply board 50, that is, the structures that use the same heat dissipation fan 70 for heat dissipation are integrally integrated into the mounting seat 15; specifically, a heat dissipation space 1511 is formed in the mounting seat 15, and the heat dissipation space 1511 is communicated with the external environment and is used for air flow exchange with the external environment. The heat dissipation space 1511 can be completely open, or air flow inlets 1591 and air flow outlets 1593 communicating with the external environment can be opened on the side wall of the heat dissipation space 1511; the first air duct 155, the second air duct 157, the heat dissipation fan 70, the frequency converter 30 and the power supply board 50 are all arranged in the heat dissipation space 1511. The heat dissipation fan 70 can drive the air flow with a lower temperature in the external environment to flow into the heat dissipation space 1511, and blow from the air outlet to the first air duct 155 and the second air duct 157. The air flow shunted into the first air duct 155 and the second air duct 157 exchanges heat with the frequency converter 30 and the power supply board 50 respectively and then flows out and then flows from the heat dissipation space 1511 to the outside.

[0056] With reference toFigures 3 to 7 , in some embodiments of the present application, the mounting base 15 includes a base body 151 and a cover body 153. The base body 151 is provided with a heat dissipation space 1511. The cover body 153 includes a fan housing 1531, a first housing 1532, and a second housing 1533. The fan housing 1531 is formed with a mounting hole 1534. The hole wall of the mounting hole 1534 is provided with a first inlet 1551 and a second inlet 1571 that are circumferentially spaced apart. The heat dissipation fan 70 is disposed in the mounting hole 1534. The first housing 1532 is connected to the part of the fan housing 1531 where the first inlet 1551 is formed. The first housing 1532 covers the bottom wall of the heat dissipation space 1511 to enclose a first air duct 155. One end of the first housing 1532 away from the first inlet 1551 is provided with a first outlet 1553. The second housing 1533 is connected to the part of the fan housing 1531 where the second inlet 1571 is formed. The second housing 1533 covers the bottom wall of the heat dissipation space 1511 to enclose a second air duct 157. One end of the second housing 1533 away from the second inlet 1571 is provided with a second outlet 1573.

[0057] In this embodiment, the mounting base 15 is formed by combining the base body 151 and the cover body 153. The mounting base 15 is formed with the aforementioned heat dissipation space 1511. The cover body 153 is disposed in the mounting base 15 and includes a fan housing 1531, a first housing 1532, and a second housing 1533. The first housing 1532 and the second housing 1533 are circumferentially spaced apart along the fan housing 1531. A mounting hole 1534 for mounting the heat dissipation fan 70 is formed in the fan housing 1531. A first inlet 1551 and a second inlet 1571 that are respectively communicated with the first housing 1532 and the second housing 1533 are opened on the hole wall of the mounting hole 1534. One end of the first housing 1532 away from the fan housing 1531 is provided with a first outlet 1553. One end of the second housing 1533 away from the fan housing 1531 is provided with a second outlet 1573. When the cover body 153 covers the bottom wall of the heat dissipation space 1511, the first housing 1532 and the bottom wall of the heat dissipation space 1511 enclose a first air duct 155, and the second housing 1533 and the bottom wall of the heat dissipation space 1511 enclose a second air duct 157. The cover body 153 and the base body 151 are detachably connected, which can be at least one of bolt connection, snap connection, magnetic attraction connection, bonding, etc., so as to facilitate the disassembly and assembly of the frequency converter 30 and the power supply board 50.

[0058] In some embodiments, the first housing 1532 and the second housing 1533 are spaced apart, and an interval region 158 is formed between the first housing 1532 and the second housing 1533 to increase the thermal resistance between the first housing 1532 and the second housing 1533, reduce the heat transfer between the first housing 1532 and the second housing 1533, thereby preventing the heat generated by the frequency converter 30 in the first air duct 155 and the power supply board 50 in the second air duct 157 from being transferred to and affecting each other, and ensuring the stable performance of the frequency converter 30 and the power supply board 50.

[0059] Please refer to Figure 1 and Figure 10 , in some embodiments of the present application, the mounting base 15 is provided with a bottom cover 159. The bottom cover 159 covers the opening of the heat dissipation space 1511 and is provided with an air inlet 1591 and an air outlet 1593. The air inlet 1591 is arranged facing the heat dissipation fan 70, and the air outlet 1593 is located at one end of the first air duct 155 and the second air duct 157 away from the heat dissipation fan 70.

[0060] In this embodiment, the bottom cover 159 is arranged to cover the opening of the heat dissipation space 1511 to protect the structures such as the heat dissipation fan 70 and the housing 153 in the heat dissipation space 1511 and reduce the risk of damage to the heat dissipation fan 70 and the housing 153. And it makes the appearance of the mounting base 15 neat. An air inlet 1591 and an air outlet 1593 communicating with the heat dissipation space 1511 are provided on the bottom cover 159. The air inlet 1591 is arranged facing the heat dissipation fan 70 to facilitate the heat dissipation fan 70 to directly extract the external cooling air flow; the air outlet 1593 is arranged at one end of the first housing 1532 and the second housing 1533 away from the heat dissipation fan 70, so as to be adjacent to the first outlet 1553 and the second outlet 1573, facilitating the rapid discharge of the heated air flow after heat exchange from the heat dissipation space 1511. Among them, the air inlet 1591 can be arranged as a mesh structure or a grille structure to increase the air intake efficiency while effectively blocking foreign objects from entering the heat dissipation space 1511; similarly, the air outlet 1593 can also be arranged as a mesh structure and a grille structure to increase the exhaust efficiency and effectively block foreign objects from entering the heat dissipation space 1511.

[0061] Please refer to Figure 10 , in some embodiments of the present application, the distance between the air outlet of the frequency converter 30 and the heat dissipation fan 70 is less than the distance between the frequency converter 30 and the air outlet 1593.

[0062] It can be understood that when the frequency converter 30 operates in the microwave cooking appliance 100, it generates a relatively high amount of heat. When the air flow passes through the frequency converter 30, it absorbs the heat of the frequency converter 30 and also has a relatively high temperature rise. If the air flow is discharged to the outside in a relatively high-temperature state, it may damage the items outside the microwave cooking appliance 100 or cause burns to people. In this embodiment, the distance between the frequency converter 30 and the air outlet of the cooling fan 70 is made smaller than the distance between the frequency converter 30 and the air outlet 1593. With this setting, after the relatively low-temperature air flow blown by the cooling fan 70 passes through the frequency converter 30, it can have a sufficient air duct length to be sufficiently cooled before flowing out of the heat dissipation space 1511, avoiding blowing out high-temperature air flow that may affect external items or burn users.

[0063] It should be noted that in some embodiments, the distances between the frequency converter 30 and the air outlet of the cooling fan 70 and the air outlet 1593 can be measured by the projections of the air outlet of the cooling fan 70, the air outlet 1593, and the frequency converter 30 on the installation surface; among them, the projection of the air outlet of the cooling fan 70 is approximately a straight line, and the distance between any point on this straight line and the projection edge of the frequency converter 30 can be measured. Similarly, the distance between the projection edge of the air outlet 1593 and the projection edge of the frequency converter 30 can be measured. It is only necessary to ensure that the distance D between at least some positions on the projection straight line of the air outlet of the cooling fan 70 and the projection edge of the frequency converter 30 and the distance d between at least some positions on the projection edge of the air outlet 1593 and the projection edge of the frequency converter 30 satisfy D < d. If there are multiple air outlets 1593, it is only necessary to ensure that the distance between at least one of the air outlets 1593 and the frequency converter 30 is greater than the distance between the air outlet of the cooling fan 70 and the frequency converter 30.

[0064] Please refer to Figure 10 , in some embodiments of the present application, the distance between the frequency converter 30 and the air outlet of the cooling fan 70 is D, and the distance between the frequency converter 30 and the air outlet 1593 is d, satisfying 2D ≤ d ≤ 4D.

[0065] In this embodiment, the distance d between the frequency converter 30 and the air outlet 1593 is 2 to 4 times the distance D between the frequency converter 30 and the air outlet of the cooling fan 70. The ratio d / D between d and D can take values of 2, 2.5, 3, 3.5, 4, and any value between 2 and 4, which is not limited here. With this setting, it is ensured that after the relatively low-temperature air flow blown by the cooling fan 70 passes through the frequency converter 30, it can have a sufficient air duct length to be sufficiently cooled before flowing out of the heat dissipation space 1511, avoiding blowing out high-temperature air flow that may affect external items or burn users; at the same time, it avoids the frequency converter 30 being too close to the cooling fan 70, which may affect the performance of the cooling fan 70, and also avoids affecting the air flow that is diverted to the second air duct 157 for cooling the power supply board 50.

[0066] Please refer toFigure 9 , in some embodiments of the present application, the air outlet of the cooling fan 70 includes a first air outlet 73 and a second air outlet 75. The first air outlet 73 is arranged towards the first inlet 1551, and the second air outlet 75 is arranged towards the second inlet 1571.

[0067] In this embodiment, the cooling fan 70 includes a housing and an impeller disposed in the housing. The housing is provided with an air inlet, a first air outlet 73 and a second air outlet 75. The impeller is arranged in the housing. When the impeller rotates, it can drive the external air flow to flow into the housing from the air inlet and then flow out from the first air outlet 73 and the second air outlet 75 respectively. Among them, the cooling fan 70 can be an axial flow fan or a centrifugal fan. By arranging the first air outlet 73 and the second air outlet 75 at intervals, and making the first air outlet 73 opposite to the first inlet 1551 of the first air duct 155, the opening areas of the first air outlet 73 and the first inlet 1551 can be better overlapped, so that most of the air flow blown out from the first air outlet 73 can enter the first air duct 155. Similarly, by making the second air outlet 75 opposite to the second inlet 1571 of the second air duct 157, the opening areas of the second air outlet 75 and the second inlet 1571 can be better overlapped, so that most of the air flow blown out from the second air outlet 75 can enter the second air duct 157. With such an arrangement, the problem that part of the air flow blown out from the air outlet leaks from the gap between the first inlet 1551 and the second inlet 1571 when one air outlet corresponds to the first inlet 1551 and the second inlet 1571 at the same time is avoided, the utilization rate of the air flow blown out by the cooling fan 70 is improved, and thus the heat dissipation efficiency of the frequency converter 30 and the power supply board 50 is improved.

[0068] Please refer to Figure 9 , in some embodiments of the present application, the cooling fan 70 is a centrifugal fan, including a volute 71 and an impeller disposed in the volute 71. The volute 71 forms an air duct, and the outer wall of the volute tongue of the volute 71 is provided with a first air outlet 73 and a second air outlet 75 communicating with the air duct.

[0069] In this embodiment, the cooling fan 70 is set as a centrifugal fan. The cooling fan 70 includes a volute 71 and an impeller. The impeller is arranged in the air chamber in the middle of the volute 71. A first air outlet 73 and a second air outlet 75 are formed on the outer wall of the volute tongue of the volute 71. The first air outlet 73 is arranged opposite to the first inlet 1551 of the first air duct 155, and the second air outlet 75 is arranged opposite to the second inlet 1571 of the second air duct 157. Generally, the centrifugal fan further includes a driving structure such as a motor for driving the impeller to rotate in the air chamber, so that air flow enters the air chamber and then flows into the air duct of the volute 71, and then flows into the first air duct 155 and the second air duct 157 respectively from the first air outlet 73 and the second air outlet 75. At this time, the air inlet 1591 formed on the bottom cover 159 can be arranged opposite to the impeller, and the air flow blows into the first air duct 155 and the second air duct 157 arranged circumferentially around the fan after being reversed by the centrifugal fan, standardizing the air flow direction, improving the air flow utilization rate, and reducing noise and air flow loss.

[0070] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A microwave cooking device, characterized in that: include: A cooking space is formed in the appliance body, and a first air duct and a second air duct are arranged side by side and isolated from each other; A frequency converter, the frequency converter being arranged in the first air duct; a power board, the power board being arranged in the second air duct; and A heat dissipation fan is arranged on the device body, and an air outlet of the heat dissipation fan is arranged toward the first inlet of the first air duct and the second inlet of the second air duct.

2. The microwave cooking device according to claim 1, characterized in that: An opening area of ​​the first inlet is larger than an opening area of ​​the second inlet.

3. The microwave cooking device according to claim 2, characterized in that: An opening area S of the first inlet and an opening area s of the second inlet satisfy 2s≤S≤5s.

4. The microwave cooking device according to claim 1, characterized in that: The side walls of the first air duct and the second air duct are arranged at intervals.

5. The microwave cooking device according to claim 1, characterized in that: The appliance body comprises a pot body, a cover body and a mounting seat; The cooking space is formed in the pot body, and the cover body is openably and closably arranged on the pot body; The mounting seat is arranged on the pot body and forms a heat dissipation space, the first air duct and the second air duct are formed in the heat dissipation space, and the heat dissipation fan is arranged in the heat dissipation space.

6. The microwave cooking device according to claim 5, characterized in that: The mounting seat comprises a seat body and a cover body, the seat body is provided with the heat dissipation space, and the cover body comprises: A fan housing, wherein the fan housing is formed with a mounting hole, a hole wall of the mounting hole is provided with the first inlet and the second inlet spaced apart along the circumferential direction, and the heat dissipation fan is arranged in the mounting hole; a first housing, the first housing being connected to a portion of the fan housing where the first inlet is formed, the first housing being disposed on a bottom wall of the heat dissipation space to enclose and form the first air duct, and a first outlet being formed at one end of the first housing away from the first inlet; The second cover shell is connected to the part of the fan cover shell where the second inlet is formed, the second cover shell is covered on the bottom wall of the heat dissipation space to enclose and form the second air duct, and the second cover shell has a second outlet at one end away from the second inlet.

7. The microwave cooking device according to claim 5, characterized in that: The mounting base is provided with a bottom cover, which is arranged on the opening of the heat dissipation space and is provided with an air flow inlet and an air flow outlet, wherein the air flow inlet is arranged toward the heat dissipation fan, and the air flow outlet is located at one end of the first air duct and the second air duct away from the heat dissipation fan.

8. The microwave cooking device according to claim 7, characterized in that: The distance between the frequency converter and the air outlet of the heat dissipation fan is smaller than the distance between the frequency converter and the air flow outlet.

9. The microwave cooking device according to claim 8, characterized in that: The distance between the frequency converter and the air outlet of the heat dissipation fan is D, and the distance between the frequency converter and the air flow outlet is d, satisfying 2D≤d≤4D.

10. The microwave cooking device according to any one of claims 1 to 9, characterized in that: The air outlet of the heat dissipation fan includes a first air outlet and a second air outlet, the first air outlet is arranged toward the first inlet, and the second air outlet is arranged toward the second inlet.

11. The microwave cooking device according to claim 10, characterized in that: The heat dissipation fan is a centrifugal fan, including a volute and an impeller arranged in the volute, the volute forms an air duct, and the outer wall of the volute tongue of the volute is provided with the first air outlet and the second air outlet connected to the air duct.

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