Heat dissipation device of electric control board and range hood comprising same

Abstract

The utility model provides a kind of heat dissipation device of electric control board and range hood comprising it, heat dissipation device includes first metal cover and the second metal cover of interval sleeve in first metal cover, and at least one drain pipe;First metal cover is set with at least one heat dissipation air inlet on the side wall of the air inlet end away from main fan, the shell of main fan is set with at least one heat dissipation air outlet between first metal cover and second metal cover at the main air inlet close to main fan, the inlet of drain pipe is communicated with heat dissipation air outlet, and the outlet of drain pipe extends to the import negative pressure area of main fan.In hot air flow conanda effect, hot air flow produced by electric control board flows in second metal cover inner surface, and flowing air flow can reduce the thermal boundary layer of second metal cover inner side surface.By setting drain pipe, while heat dissipation, it can also air supplement to the negative pressure area of main fan air inlet, reduce the vortex noise of main fan at air inlet, improve the range hood whole machine efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of heat dissipation in electrical appliances, and in particular to a heat dissipation device for an electronic control board and a range hood including the same. Background Technology

[0002] The heating elements on a range hood circuit board include inductors, capacitors, bridge rectifiers, and IPMs (Intelligent Power Modules), arranged on a PCB (Printed Circuit Board). A metal casing covers the entire circuit board, forming its control box. To better dissipate heat from these elements, high-power components are typically equipped with heat sinks; for example, IPMs use large strip fins to enhance heat transfer. Currently, the circuit board is enclosed in a sealed metal casing. This casing not only protects the board from external impacts but also prevents small amounts of cooking fumes from adhering to its surface, avoiding long-term fumes buildup that could affect performance. Therefore, heat dissipated from the heating elements is conducted to the fins, then naturally convection into the metal casing, and finally dissipated to the outside through the casing. However, due to the very low airflow velocity outside the casing, heat dissipation is limited to natural convection, resulting in poor overall cooling.

[0003] Currently, with the increasing demand for airflow in range hoods, the power of range hood motors is also constantly increasing, leading to a significant increase in the heat generated by the heating elements on the circuit board. The existing circuit board and metal casing structure cannot dissipate heat in time, causing the surface temperature of the circuit board to rise and easily exceed national safety standards. Therefore, the existing structure cannot meet the heat dissipation requirements under high power. On the other hand, for better power supply, current circuit board designs generally have separate high-voltage and low-voltage sides. The heating elements on the high-voltage side are concentrated, and the heat generated is greater than that on the low-voltage side, causing the temperature on this side to easily exceed safety standards, affecting the overall heat dissipation effect. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the defect of poor heat dissipation of the electronic control board of the existing range hood, and to provide a heat dissipation device for the electronic control board and a range hood including the same.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution:

[0006] A heat dissipation device for an electronic control board is provided on the housing of the main fan of a range hood. The heat dissipation device includes a first metal cover and a second metal cover spaced within the first metal cover, as well as at least one drain pipe. The electronic control board is enclosed within the second metal cover.

[0007] The first metal cover has at least one heat dissipation air inlet on the side wall away from the air inlet end of the main fan. The housing of the main fan has at least one heat dissipation air outlet near the main air inlet of the main fan and located between the first metal cover and the second metal cover. The inlet of the drain pipe is connected to the heat dissipation air outlet, and the outlet of the drain pipe extends to the negative pressure area of ​​the inlet of the main fan.

[0008] In this design, the heat dissipation device encloses the electronic control board within a second metal cover, preventing oil stains from entering the second metal cover and contaminating the electronic control board during range hood use or heat dissipation. By interlacing a first metal cover around the second metal cover, a heat dissipation duct is formed, accelerating the airflow within the duct and allowing heat to be dissipated more quickly, thus improving the overall heat dissipation effect. Under the Coanda effect (the tendency of a fluid to flow along a convex surface instead of its original direction, also known as wall-attached flow), the hot airflow generated by the electronic control board flows along the inner surface of the second metal cover. This airflow reduces the thermal boundary layer on the inner surface of the second metal cover, enhancing heat transfer between the hot airflow and the second metal cover, conducting heat outwards, and creating a circulating flow within the second metal cover due to pressure variations, further accelerating heat transfer. The airflow also reduces the thermal boundary layer on the outer surface of the second metal cover, resulting in better heat dissipation and improved heat exchange efficiency. By installing a drainage pipe and extending its outlet to the negative pressure area at the main fan inlet, the range hood can not only dissipate heat but also replenish air to the negative pressure area at the main fan inlet, reducing the vortex noise at the main fan inlet and improving the overall efficiency of the range hood.

[0009] Preferably, the second metal cover is an arc-shaped structure that extends arc-shapedly from the heat dissipation inlet to the heat dissipation outlet.

[0010] In this design, setting the second metal cover as an arc-shaped structure can reduce the resistance of gas flow along the surface of the second metal cover, and extending from the heat dissipation inlet to the heat dissipation outlet, thus lengthening the gas flow path and improving heat exchange efficiency.

[0011] Preferably, the arc angle of the arc structure is set to match the height of the heat dissipation components on the high-voltage side and the low-voltage side of the electronic control board.

[0012] In this solution, the above-mentioned configuration ensures that the arc-shaped structure of the second metal cover will not affect the use of heat dissipation components on the electronic control board, while also allowing the airflow inside the second metal cover to circulate evenly, thus avoiding uneven heat dissipation.

[0013] Preferably, a plurality of spaced partitions are provided between the first metal cover and the second metal cover, and the partitions are arranged along the flow direction of gas from the heat dissipation inlet to the heat dissipation outlet.

[0014] In this solution, the aforementioned baffles serve to guide the flow of heat dissipation gas, dividing the heat dissipation airflow between the two metal covers into multiple flow channels. This results in more regular gas flow, rather than the gas flowing randomly within a large heat dissipation airflow channel, leading to a more uniform airflow distribution and more effective heat dissipation.

[0015] Preferably, the partition extends vertically, and both ends of the partition extend to the bottom surface of the first metal cover and the top surface of the second metal cover, respectively.

[0016] In this design, the two ends of the partition extend to the first metal cover and the second metal cover respectively, which not only guides the airflow but also conducts heat. The heat from the second metal cover is transferred to the first metal cover through heat transfer, further improving the heat dissipation effect.

[0017] Preferably, the partitions divide the space between the first metal cover and the second metal cover into several air ducts, and each air duct is connected to at least one heat dissipation air inlet and at least one heat dissipation air outlet at both ends.

[0018] In this solution, the above-mentioned configuration ensures that airflow can pass through any of the air ducts, making heat dissipation more uniform and effectively improving heat dissipation efficiency. It also avoids the situation where airflow cannot pass through due to some air ducts being disconnected, resulting in uneven airflow distribution between the first and second metal covers, which would lead to uneven heat dissipation and reduce the heat dissipation effect.

[0019] Preferably, the inlet of one of the drainage pipes is connected to the outlets of several of the guiding air ducts.

[0020] In this solution, only one inlet pipe is needed to connect to the outlets of multiple air ducts, eliminating the need for multiple inlet pipes and making the overall structure more compact.

[0021] Preferably, the inner and / or outer surfaces of the second metal cover are provided with a press-formed structure extending along the heat dissipation inlet to the heat dissipation outlet.

[0022] In this design, the molding on the metal cover not only increases the heat dissipation area and improves heat dissipation efficiency, but also acts as a guide. As the airflow temperature and velocity decrease, the airflow can flow adaptively along the molding structure and make better contact with the wall of the metal cover.

[0023] Preferably, the opening of the drainage tube gradually increases in size along the direction of gas flow.

[0024] In this solution, the above-mentioned setup creates an expanding air duct inside the drainage pipe, gradually releasing gas pressure and increasing the coverage area of ​​the drainage pipe over the inlet negative pressure area, which helps reduce vortex noise at the air inlet.

[0025] A range hood includes a heat dissipation device for the electronic control board as described in any of the above arrangements.

[0026] In this design, the heat dissipation device encloses the electronic control board within a second metal cover, preventing oil stains from entering the second metal cover and contaminating the electronic control board during range hood use or heat dissipation. By interlacing a first metal cover around the second metal cover, a heat dissipation duct is formed, accelerating the airflow within the duct and allowing heat to be dissipated more quickly, thus improving the overall heat dissipation effect. Under the Coanda effect (the tendency of a fluid to flow along a convex surface instead of its original direction, also known as wall-attached flow), the hot airflow generated by the electronic control board flows along the inner surface of the second metal cover. This airflow reduces the thermal boundary layer on the inner surface of the second metal cover, enhancing heat transfer between the hot airflow and the second metal cover, conducting heat outwards, and creating a circulating flow within the second metal cover due to pressure variations, further accelerating heat transfer. The airflow also reduces the thermal boundary layer on the outer surface of the second metal cover, resulting in better heat dissipation and improved heat exchange efficiency. By installing a drainage pipe and extending its outlet to the negative pressure area at the main fan inlet, the range hood can not only dissipate heat but also replenish air to the negative pressure area at the main fan inlet, reducing the vortex noise at the main fan inlet and improving the overall efficiency of the range hood.

[0027] The positive and progressive effects of this invention are as follows: The heat dissipation device encloses the electronic control board within a second metal cover, preventing oil stains from entering the second metal cover and contaminating the electronic control board during range hood use or heat dissipation. By interlacing a first metal cover around the second metal cover, a heat dissipation duct is formed, accelerating the airflow speed within the duct and allowing heat to be dissipated more quickly, thus improving the overall heat dissipation effect. Under the Coanda effect (the tendency of a fluid to flow along a convex surface instead of its original direction, also known as wall-attached flow), the hot airflow generated by the electronic control board flows along the inner surface of the second metal cover. This airflow reduces the thermal boundary layer on the inner surface of the second metal cover, enhancing heat transfer between the hot airflow and the second metal cover, conducting heat outwards, and creating a circulating flow within the second metal cover due to pressure variations, further accelerating heat transfer. The airflow also reduces the thermal boundary layer on the outer surface of the second metal cover, resulting in better heat dissipation and improved heat exchange efficiency. By installing a drainage pipe and extending its outlet to the negative pressure area at the main fan inlet, the range hood can not only dissipate heat but also replenish air to the negative pressure area at the main fan inlet, reducing the vortex noise at the main fan inlet and improving the overall efficiency of the range hood. Attached Figure Description

[0028] Figure 1 This is a cross-sectional view of the heat dissipation device structure and the range hood structure according to an embodiment of the present utility model;

[0029] Figure 2 This is a cross-sectional view of the heat dissipation device structure according to an embodiment of the present utility model;

[0030] Figure 3 This is a schematic diagram of the heat dissipation device structure according to an embodiment of the present utility model;

[0031] Figure 4 This is a schematic diagram of the heat dissipation structure and partition arrangement of an embodiment of the present utility model;

[0032] Figure 5 This is a schematic diagram of the structure of a range hood equipped with an electronic control board and its heat dissipation device according to an embodiment of the present invention.

[0033] Explanation of reference numerals in the attached figures:

[0034] Electronic control board 1

[0035] First Metal Cover 2

[0036] Second metal shield 3

[0037] Heat dissipation air inlet 4

[0038] 5 heat dissipation vents

[0039] Drainage tube 6

[0040] partition 7

[0041] 8 air diversion ducts

[0042] Range hood 9

[0043] Main fan 10

[0044] Main air inlet 11

[0045] Import negative pressure zone 12 Detailed Implementation

[0046] The present invention will be described more clearly and completely below with reference to the accompanying drawings, using a preferred embodiment.

[0047] This embodiment provides a heat dissipation device for the electronic control board 1. This heat dissipation device is installed on the casing of the range hood 9 and is used to dissipate heat from the electronic control board 1. The electronic control board 1 is an electronic circuit control board used to control the operation of the range hood 9, and is simply referred to as the electronic control board 1. The electronic control board 1 is typically installed on the casing of the main fan 10 of the range hood 9. The heat dissipation device of this embodiment is provided on the outside of the electronic control board 1 to dissipate heat from the electronic control board 1 of the range hood 9.

[0048] like Figures 1-5 As shown, a heat dissipation device for an electronic control board 1 is provided on the housing of the main fan 10 of the range hood 9. The heat dissipation device includes a first metal cover 2 and a second metal cover 3 spaced inside the first metal cover 2, as well as at least one drain pipe 6. The electronic control board 1 is enclosed in the second metal cover 3.

[0049] The first metal cover 2 has at least one heat dissipation air inlet 4 on the side wall away from the air inlet end of the main fan 10. The casing of the main fan 10 has at least one heat dissipation air outlet 5 near the main air inlet 11 of the main fan 10 and located between the first metal cover 2 and the second metal cover 3. The inlet of the drain pipe 6 is connected to the heat dissipation air outlet 5, and the outlet of the drain pipe 6 extends to the inlet negative pressure area 12 of the main fan 10.

[0050] The heat dissipation device encloses the electronic control board 1 within the second metal cover 3, preventing oil stains from entering the second metal cover 3 and contaminating the electronic control board 1 during the use or heat dissipation process of the range hood 9. By spaced-out first metal covers 2 outside the second metal cover 3, a heat dissipation duct is formed, accelerating the airflow speed within the duct and allowing heat to be dissipated more quickly, thus improving the overall heat dissipation effect. Under the Coanda effect (the Coanda effect refers to the tendency of a fluid to deviate from its original flow direction and flow along a convex surface, also known as wall-attached flow), the hot airflow generated by the electronic control board 1 flows along the inner surface of the second metal cover 3. This airflow reduces the thermal boundary layer on the inner surface of the second metal cover 3, enhancing heat transfer between the hot airflow and the second metal cover 3, conducting heat outwards, and circulating within the second metal cover 3 due to pressure variations, accelerating heat transfer. On the other hand, the gas within the heat dissipation duct, driven by the cooling fan, flows along the outer surface of the second metal cover 3, carrying away heat. This airflow also reduces the thermal boundary layer on the outer surface of the second metal cover, resulting in a better heat dissipation effect for the second metal cover 3. This improves heat exchange efficiency and enhances the heat dissipation effect on the electronic control board 1. By setting up the diversion pipe 6 and extending the outlet of the diversion pipe 6 to the negative pressure area 12 at the inlet of the main fan 10, air can be supplied to the negative pressure area at the air inlet of the main fan 10 while dissipating heat, reducing the vortex noise of the main fan 10 at the air inlet and improving the overall efficiency of the range hood 9.

[0051] Furthermore, such as Figures 1-2 As shown, the second metal cover 3 has an arc-shaped structure, which extends arc-shaped from the heat dissipation air inlet 4 to the heat dissipation air outlet 5. Setting the second metal cover 3 as an arc-shaped structure can reduce the resistance of gas flow along the surface of the second metal cover 3, and extending from the heat dissipation air inlet 4 to the heat dissipation air outlet 5, it prolongs the gas flow path and improves the heat exchange efficiency.

[0052] In other embodiments, the structure of the second metal cover 3 is not specifically limited, and it can also be set as a trapezoidal structure or other structures with slopes, as long as it does not affect the use and heat dissipation of the electronic control board 1.

[0053] Specifically, the arc angle of the arc structure is set to match the height of the heat dissipation components on the high-voltage side and the low-voltage side of the control board 1. This setting ensures that the arc structure of the second metal cover 3 does not affect the use of the heat dissipation components on the control board 1, while also allowing for uniform airflow circulation inside the second metal cover 3, thus avoiding uneven heat dissipation.

[0054] In this embodiment, the two metal covers (first metal cover 2 and second metal cover 3) are each a box-shaped shell. Therefore, when the control board 1 is enclosed in the metal cover, the heat dissipation device and the control board 1 as a whole are also referred to as the control box. The drain pipe 6 is a curved, irregular pipe. One end of the drain pipe 6 is connected to the heat dissipation outlet 5 of the main fan 10 shell. Then, the drain pipe 6 extends towards the main air inlet 11 of the main fan 10, bends at the main air inlet 11, and extends parallel to the inlet negative pressure area 12. Generally, when the airflow of the range hood 9 enters the main fan 10, the airflow will turn 90 degrees. Therefore, the airflow velocity distribution at the inlet of the main fan 10 is uneven. Low-speed vortex areas are easily generated on the side away from the incoming flow. The inlet negative pressure area 12 is the area where low-speed vortexes are generated. The inlet negative pressure area 12 is generally located in the area between the twelve o'clock and three o'clock positions of the main fan 10's collector ring. Guiding the hot airflow to the inlet negative pressure zone 12 can balance the airflow and reduce vortex noise. Of course, the specific location of the inlet negative pressure zone 12 can be adjusted differently depending on the fan structure.

[0055] In this embodiment, as Figure 4 As shown, several spaced partitions 7 are provided between the first metal cover 2 and the second metal cover 3. The partitions 7 are arranged along the flow direction of gas from the heat dissipation inlet 4 to the heat dissipation outlet 5. The multiple partitions 7 serve to guide the heat dissipation gas, dividing the heat dissipation airflow between the two metal covers into multiple guiding channels. The gas flow is more regular, rather than flowing randomly within a large heat dissipation airflow channel. The airflow distribution is more uniform, and the heat dissipation effect is more complete.

[0056] In other embodiments, the partition 7 may not extend to the first metal cover 2. In this case, the partition 7 only serves as a guide, unlike the embodiment in which the partition 7 is extended to the first metal cover 2, which further improves the heat dissipation effect.

[0057] Furthermore, the partition 7 extends vertically, and its two ends extend to the bottom surface of the first metal cover 2 and the top surface of the second metal cover 3, respectively. While guiding the flow, it can also conduct heat, transferring the heat from the second metal cover 3 to the first metal cover 2 through heat transfer, thereby further improving the heat dissipation effect.

[0058] Specifically, multiple partitions 7 divide the space between the first metal cover 2 and the second metal cover 3 into several airflow channels 8. Each airflow channel 8 is connected to at least one heat dissipation air inlet 4 and at least one heat dissipation air outlet 5 at both ends. This arrangement ensures that airflow can pass through any airflow channel 8, making heat dissipation more uniform and effectively improving heat dissipation efficiency. It avoids uneven airflow distribution between the first metal cover 2 and the second metal cover 3 due to some airflow channels not being connected, resulting in uneven heat dissipation and reduced heat dissipation effect. In other embodiments, the arrangement of the partitions 7 can also be based on the position of the heat dissipation air outlet 5 or the space between the first metal cover 2 and the second metal cover 3, as long as the heat dissipation air inlet 4 and the heat dissipation air outlet 5 can be evenly connected through the airflow channels 8.

[0059] Furthermore, in this embodiment, as Figures 2-3 As shown, the inlet of one drainage pipe 6 is connected to the outlets of several guide air ducts 8. Only one drainage pipe 6 inlet is needed to connect to the outlets of multiple guide air ducts 8, eliminating the need for multiple drainage pipe 6 inlets and making the overall structure more compact.

[0060] Specifically, the opening of the drainage pipe 6 gradually increases in the direction of gas flow. Through the above arrangement, an expanding air duct is formed inside the drainage pipe 6, which gradually releases the gas pressure and also increases the coverage area of ​​the drainage pipe 6 over the inlet negative pressure area 12, which helps to reduce the vortex noise at the air inlet.

[0061] In other embodiments, a molded structure extending along the heat dissipation inlet 4 to the heat dissipation outlet 5 may also be provided on the inner and outer surfaces of the second metal cover 3. The molded structure on the metal cover can not only increase the heat dissipation area and improve the heat dissipation efficiency, but also play a guiding role. As the airflow temperature and velocity decrease, the airflow can flow adaptively along the molded structure and make better contact with the wall surface of the metal cover.

[0062] This embodiment also provides a range hood 9, such as Figure 5 As shown, the range hood 9 includes the heat dissipation device of the electronic control board 1 in this embodiment.

[0063] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A heat dissipation device for an electronic control board, disposed on the housing of the main fan of a range hood, characterized in that, The heat dissipation device includes a first metal cover and a second metal cover spaced within the first metal cover, as well as at least one drainage pipe, and the electronic control board is enclosed within the second metal cover; The first metal cover has at least one heat dissipation air inlet on the side wall away from the main air inlet of the main fan. The housing of the main fan has at least one heat dissipation air outlet near the main air inlet of the main fan and located between the first metal cover and the second metal cover. The inlet of the drain pipe is connected to the heat dissipation air outlet, and the outlet of the drain pipe extends to the inlet negative pressure area of ​​the main fan.

2. The heat dissipation device for the electronic control board as described in claim 1, characterized in that, The second metal cover has an arc-shaped structure that extends in an arc from the heat dissipation inlet to the heat dissipation outlet.

3. The heat dissipation device for the electronic control board as described in claim 2, characterized in that, The arc angle of the arc structure is set to match the height of the heat dissipation components on the high-voltage side and the low-voltage side of the electronic control board.

4. The heat dissipation device for the electronic control board as described in claim 1, characterized in that, A plurality of spaced partitions are provided between the first metal cover and the second metal cover, and the partitions are arranged along the flow direction of gas from the heat dissipation inlet to the heat dissipation outlet.

5. The heat dissipation device for the electronic control board as described in claim 4, characterized in that, The partition extends vertically, with its two ends extending to the bottom surface of the first metal cover and the top surface of the second metal cover, respectively.

6. The heat dissipation device for the electronic control board as described in claim 4, characterized in that, The partitions divide the space between the first metal cover and the second metal cover into several air ducts, and each air duct is connected to at least one heat dissipation air inlet and at least one heat dissipation air outlet at both ends.

7. The heat dissipation device for the electronic control board as described in claim 6, characterized in that, The inlet of one of the drainage pipes is connected to the outlets of several of the air ducts.

8. The heat dissipation device for the electronic control board as described in claim 1, characterized in that, The inner and / or outer surfaces of the second metal cover are provided with a pressed structure that extends along the heat dissipation inlet to the heat dissipation outlet.

9. The heat dissipation device for the electronic control board as described in claim 1, characterized in that, The opening of the drainage tube gradually increases in size along the direction of gas flow.

10. A range hood, characterized in that, The range hood includes a heat dissipation device for the electronic control board as described in any one of claims 1-9.

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