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 two interval cover metal cover, drain pipe and heat dissipation fan, electric control board is enclosed in second metal cover;The sidewall of first metal cover is equipped with heat dissipation air inlet, and the shell of main fan is equipped with heat dissipation air outlet;The air outlet of heat dissipation fan is communicated with heat dissipation air inlet;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.The heat dissipation device of electric control board and range hood comprising it, while protecting electric control board from being contaminated, accelerate the airflow speed in heat dissipation air duct, so that heat is discharged faster, improve overall heat dissipation effect.By setting drain pipe, while dissipating heat, the negative pressure area of main fan air inlet can also be air-supplied, reduce eddy current noise, improve the overall efficiency of range hood.

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 effectively, causing the circuit board surface temperature to rise and easily exceed national safety standards. Therefore, the existing structure cannot meet the heat dissipation requirements under high power. For better power supply, current circuit board designs generally have separate high-voltage and low-voltage sides. The high-voltage side has a higher concentration of heating elements, generating more heat than the low-voltage side, causing its temperature to easily exceed safety standards and affecting the overall heat dissipation effect.

[0004] On the other hand, when the airflow enters the fan of the range hood, the airflow makes a 90-degree turn, resulting in uneven velocity distribution at the fan inlet. Low-speed vortex zones are easily generated on the side away from the incoming flow, which generates startup noise and affects the fan performance. Utility Model Content

[0005] 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.

[0006] The present invention solves the above-mentioned technical problems through the following technical solution:

[0007] 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, a second metal cover spaced within the first metal cover, at least one drain pipe, and at least one cooling fan. The electronic control board is enclosed within the second metal cover.

[0008] 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, and 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 air outlet of the heat dissipation fan is connected to the heat dissipation air inlet.

[0009] The inlet of the drain pipe is connected to the heat dissipation outlet, and the outlet of the drain pipe extends to the negative pressure area at the inlet of the main fan.

[0010] In this design, the heat dissipation device encloses the electronic control board within a second metal cover to prevent oil contamination from entering the second metal cover and contaminating the electronic control board. Furthermore, by interlacing a first metal cover around the second metal cover, a heat dissipation duct is formed. A cooling fan drives the airflow within this duct, accelerating the airflow speed and allowing heat to be dissipated more quickly, thus improving the overall heat dissipation effect. On one hand, 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 air 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 air 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. On the other hand, the air within the heat dissipation duct, driven by the cooling fan, flows along the outer surface of the second metal cover, carrying away heat. This airflow also reduces the thermal boundary layer on the outer surface of the second metal cover, resulting in better heat dissipation for the second metal cover. This improves heat exchange efficiency and enhances the heat dissipation effect on the electronic control board. By setting up a diversion pipe and extending its outlet to the negative pressure area at the main fan inlet, air can be supplied to the negative pressure area at the main fan inlet while dissipating heat, reducing the vortex noise of the main fan at the inlet and improving the overall efficiency of the range hood.

[0011] Preferably, the second metal cover has an arc-shaped structure that extends arc-shapedly from the heat dissipation inlet to the heat dissipation outlet.

[0012] In this design, the second metal shield adopts an arc-shaped structure, which reduces gas flow resistance and facilitates faster heat dissipation.

[0013] Preferably, a plurality of spaced partitions are provided between the first metal cover and the second metal cover, the partitions being 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 upper and lower ends of the partition extend to the first metal cover and 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, so that it can not only guide the flow but also conduct heat, and can conduct heat from the second metal cover to the first metal cover, thereby further improving the heat dissipation effect.

[0017] Preferably, the ends of the plurality of partitions are bent and extended toward the heat dissipation outlet along the gas flow direction.

[0018] In this solution, multiple baffles are configured as described above to guide the heat dissipation gas towards the heat dissipation outlet, which helps to accelerate the gas flow and thus remove heat more quickly.

[0019] 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.

[0020] In this design, the heat dissipation duct between the two metal covers is divided into several guide ducts, which increases the contact surface for the gas to carry away heat. Each guide duct is connected to a heat dissipation inlet and a heat dissipation outlet at both ends, and the independent flow guides the air, which helps to accelerate the gas flow.

[0021] Preferably, the inlet of one of the drainage pipes is connected to the outlets of several of the guiding air ducts.

[0022] In this solution, the hot airflow from multiple air ducts is concentrated into the drainage pipe for discharge through the above-mentioned setup, eliminating the need for multiple drainage pipes and simplifying the structure.

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

[0026] 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.

[0027] A range hood, the range hood including a heat dissipation device for the electronic control board as described above.

[0028] In this design, the range hood employs the aforementioned heat dissipation device. While protecting the electronic control board from contamination, a heat dissipation duct is formed by layering a first metal cover over a second metal cover at intervals. A cooling fan drives the airflow within this duct, accelerating the airflow speed and allowing heat to dissipate more quickly, thus improving the overall heat dissipation effect. By installing a diversion pipe and extending its outlet to the negative pressure area at the main fan inlet, supplementary airflow to the negative pressure area at the main fan inlet is provided while simultaneously dissipating heat. This reduces vortex noise at the main fan inlet and improves the overall efficiency of the range hood.

[0029] The positive and progressive effects of this utility model are as follows: the heat dissipation device of the electronic control board and the range hood including it, while protecting the electronic control board from contamination, form a heat dissipation air duct by spaced-out first metal covers outside the second metal cover; the airflow within the heat dissipation air duct is accelerated by a heat dissipation fan, allowing heat to be discharged more quickly and improving the overall heat dissipation effect. By setting up a diversion pipe and extending the outlet of the diversion pipe to the negative pressure area of ​​the main fan inlet, air can be supplemented to the negative pressure area of ​​the main fan inlet while dissipating heat, reducing the vortex noise of the main fan at the inlet and improving the overall efficiency of the range hood. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of the range hood with the electronic control board and heat dissipation device installed in Embodiment 1 of this utility model.

[0031] Figure 2 This is a cross-sectional view of the internal structure of the range hood in Embodiment 1 of this utility model.

[0032] Figure 3 This is a schematic diagram of the heat dissipation device according to Embodiment 1 of this utility model.

[0033] Figure 4 This is a cross-sectional view of the internal structure of the heat dissipation device according to Embodiment 1 of this utility model.

[0034] Figure 5 This is a schematic diagram of the heat dissipation device of Embodiment 1 of this utility model after removing the first metal cover and the heat dissipation fan.

[0035] Figure 6 This is a schematic diagram of the second metal cover surface having a pressed structure in Embodiment 1 of this utility model. The arrows in the diagram indicate the direction of gas flow.

[0036] Explanation of reference numerals in the attached figures:

[0037] Range Hood 1

[0038] Main fan 2

[0039] Main air inlet 3

[0040] Import negative pressure zone 31

[0041] Electronic control board 4

[0042] Heat dissipation device 5

[0043] First Metal Cover 51

[0044] Second metal shield 52

[0045] Drainage tube 53

[0046] Cooling fan 54

[0047] Heat dissipation air inlet 55

[0048] 56 heat dissipation vents

[0049] partition 57

[0050] 58 air diversion duct

[0051] Pressed structure 59 Detailed Implementation

[0052] The present invention will be described more clearly and completely below with reference to the accompanying drawings, using a preferred embodiment.

[0053] Example 1

[0054] This embodiment provides a heat dissipation device 5 for an electronic control board 4. The electronic control board 4 is an electronic circuit control board used to control the operation of the range hood 1, and is simply referred to as the electronic control board 4. The electronic control board 4 is usually installed on the housing of the main fan 2 of the range hood 1. The external cover of the electronic control board 4 is provided with the heat dissipation device 5 of this embodiment for dissipating heat from the electronic control board 4 of the range hood 1.

[0055] like Figure 1 As shown, and in combination Figure 2 and Figure 3The heat dissipation device 5 includes a first metal cover 51, a second metal cover 52 spaced inside the first metal cover 51, a drain pipe 53 and a heat dissipation fan 54, and the electronic control board 4 is enclosed inside the second metal cover 52.

[0056] The first metal cover 51 has a heat dissipation air inlet 55 on the side wall away from the main air inlet 3 of the main fan 2. The casing of the main fan 2 has a heat dissipation air outlet 56 near the main air inlet 3 and located between the first metal cover 51 and the second metal cover 52. The air outlet of the heat dissipation fan 54 is connected to the heat dissipation air inlet 55. The inlet of the drain pipe 53 is connected to the heat dissipation air outlet 56, and the outlet of the drain pipe 53 extends to the inlet negative pressure area 31 of the main fan 2.

[0057] Specifically, in this example, the two metal covers (first metal cover 51 and second metal cover 52) are each a box-shaped shell. Therefore, when the control board 4 is enclosed inside the metal cover, the heat dissipation device 5 and the control board 4 as a whole are also referred to as the control box. The cooling fan 54 is a flat centrifugal fan, and the outlet of the centrifugal fan is connected to the heat dissipation inlet 55 through a pipe. During operation, the centrifugal fan is started, and the centrifugal force it generates draws outside air into the centrifugal fan and then sends it to the heat dissipation inlet 55. The air flows in the heat dissipation duct between the two metal covers, carrying away the heat generated by the control board 4 and the heat transferred to the second metal cover 52. Then the hot air is discharged from the heat dissipation outlet 56 and through the drain pipe 53. The guide pipe 53 is a curved, irregularly shaped pipe. One end of the guide pipe 53 is connected to the heat dissipation outlet 56 of the main fan 2's casing. The guide pipe 53 then extends towards the main air inlet 3 of the main fan 2, bends at the main air inlet 3, and extends parallel to the inlet negative pressure area 31. Generally, when the airflow from the range hood 1 enters the main fan 2, the airflow makes a 90-degree turn. Therefore, the airflow velocity distribution at the inlet of the main fan 2 is uneven, and a low-speed vortex area is easily generated on the side far from the incoming flow. This inlet negative pressure area 31 is the area where the low-speed vortex is generated. This inlet negative pressure area 31 is generally located in the area between the twelve o'clock and three o'clock positions of the main fan 2's collector ring. Guiding the hot airflow to this inlet negative pressure area 31 can balance the airflow and reduce vortex noise. Of course, the specific location of this inlet negative pressure area 31 can be adjusted differently depending on the fan structure.

[0058] In other embodiments, the cooling fan 54 may also be of other types, and the shape of the two metal covers, the size and number of the cooling air inlet 55 and the cooling air outlet 56 may also be adjusted according to the specific structural requirements.

[0059] The heat dissipation device 5 encloses the electronic control board 4 within the second metal cover 52, preventing oil from entering the second metal cover 52 and contaminating the electronic control board 4. Furthermore, by spaced-out first metal covers 51 outside the second metal cover 52, a heat dissipation duct is formed. A heat dissipation fan 54 drives the airflow within the duct, accelerating the airflow speed and allowing heat to be dissipated more quickly, thus improving the overall heat dissipation effect. On one hand, under the Coanda effect (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 4 flows along the inner surface of the second metal cover 52. This flowing airflow reduces the thermal boundary layer on the inner surface of the second metal cover 52, enhancing heat transfer between the hot airflow and the second metal cover 52, conducting heat outwards, and circulating within the second metal cover 52 due to pressure variations, further accelerating heat transfer. On the other hand, under the action of the cooling fan 54, the gas in the heat dissipation duct is driven to flow on the outer surface of the second metal cover 52, carrying away heat. The airflow can also reduce the thermal boundary layer on the outer surface of the second metal cover, thus achieving a better heat dissipation effect on the second metal cover 52. This improves the heat exchange efficiency and enhances the heat dissipation effect on the electronic control board 4. By setting up the diversion pipe 53 and extending the outlet of the diversion pipe 53 to the negative pressure area 31 of the main fan 2 inlet, while dissipating heat, it can also supplement the negative pressure area of ​​the main fan 2 inlet, reducing the vortex noise of the main fan 2 at the main air inlet 3 and improving the overall efficiency of the range hood 1.

[0060] Among them, such as Figure 4 As shown, the second metal cover 52 in this embodiment has an arc-shaped structure, which extends arc-shapedly from the heat dissipation inlet 55 to the heat dissipation outlet 56. The arc-shaped structure of the second metal cover 52 reduces gas flow resistance and facilitates faster heat dissipation.

[0061] In this embodiment, the first metal cover 51 is a square shell to maintain a regular external shape and facilitate manufacturing. Of course, the shape of the first metal cover 51 can also adopt other shapes and structures that are more conducive to heat dissipation.

[0062] Furthermore, such as Figure 4 and Figure 5 As shown, a number of spaced baffles 57 are provided between the first metal cover 51 and the second metal cover 52. The baffles 57 are arranged along the flow direction of gas from the heat dissipation inlet 55 to the heat dissipation outlet 56, forming a series of guide baffles 57, also called guide baffle 57 fins. The multiple baffles 57 serve to guide the heat dissipation gas, dividing the heat dissipation air channel between the two metal covers into multiple guide channels. The gas flow is more regular, rather than flowing randomly in a large heat dissipation air channel. The airflow distribution is more uniform, and the heat dissipation effect is more complete.

[0063] Furthermore, the upper and lower ends of the partition 57 extend to the first metal cover 51 and the second metal cover 52 respectively, thus serving both a heat conduction and a heat dissipation function. That is, the heat generated by the control board 4 is transferred to the second metal cover 52, and then through the partitions 57 to the first metal cover 51, where it is carried away by the airflow outside the first metal cover 51. Therefore, the partitions 57 effectively conduct heat from the second metal cover 52 to the first metal cover 51, further improving the heat dissipation effect. In other embodiments, the partitions 57 may not extend to the first metal cover 51, in which case the partitions 57 merely serve a heat conduction function, unlike this embodiment where the partitions 57 extend to the first metal cover 51, further enhancing the heat dissipation effect.

[0064] Among them, such as Figure 5 As shown, multiple baffles 57 bend and extend towards the heat dissipation outlet 56 at their ends along the gas flow direction. This structural form guides the heat dissipation gas to concentrate at the heat dissipation outlet 56, which helps to accelerate the gas flow and thus remove heat more quickly.

[0065] In this embodiment, a large heat dissipation air inlet 55 is provided on the first metal cover 51, and a large heat dissipation air outlet 56 is provided on the housing of the main fan 2. Several air ducts 58, spaced apart by multiple partitions 57, are all connected to a heat dissipation air inlet 55 and a heat dissipation air outlet 56. However, in other embodiments, multiple heat dissipation air inlets 55 can also be provided on the first metal cover 51, and multiple heat dissipation air outlets 56 can also be provided on the housing of the main fan 2. Each air duct 58 has at least one heat dissipation air inlet 55 and at least one heat dissipation air outlet 56 connected at both ends. In this way, each air duct 58 has an independently flowing heat dissipation air outlet 56 and heat dissipation air inlet 55, which helps increase the air intake volume, increases the contact surface for heat removal by the gas, and the independent flow of each air duct 58 helps accelerate gas flow.

[0066] like Figure 5 As shown, in this embodiment, the inlet of one drainage pipe 53 is connected to the outlet of several guide air ducts 58. The hot airflow from multiple guide air ducts 58 is concentrated into the drainage pipe 53 for discharge, eliminating the need for multiple drainage pipes 53, thus simplifying the structure.

[0067] The opening of the drainage pipe 53 gradually increases in the direction of gas flow, forming an expansion air duct inside the drainage pipe 53, which gradually releases the gas pressure and increases the coverage area of ​​the drainage pipe 53 over the inlet negative pressure area 31, which helps to reduce the vortex noise at the main air inlet 3.

[0068] In other embodiments, such as Figure 6As shown, for better heat dissipation, a molded structure 59 extending from the heat dissipation inlet 55 to the heat dissipation outlet 56 can be provided on the inner or outer surface of the second metal cover 52, or both the inner and outer surfaces. The molded structure on the metal cover not only increases the heat dissipation area and improves the heat dissipation efficiency, but also acts as a guide. As the airflow temperature and velocity decrease, the airflow can flow adaptively along the molded structure 59, making better contact with the wall of the metal cover.

[0069] Example 2

[0070] A range hood 1 includes a heat dissipation device 5 for the electronic control board 4 as described in Embodiment 1. By employing the heat dissipation device 5 of Embodiment 1, the range hood 1 protects the electronic control board 4 from contamination. A first metal cover 51 is spaced outside a second metal cover 52, forming a heat dissipation duct. A heat dissipation fan 54 drives gas to flow within the duct, accelerating the airflow speed and allowing heat to be dissipated more quickly, thus improving the overall heat dissipation effect. By providing a guide pipe 53 and extending its outlet to the negative pressure area 31 at the inlet of the main fan 2, air can be supplied to the negative pressure area at the main fan 2's inlet while simultaneously dissipating heat, reducing vortex noise at the main fan 2's main inlet 3 and improving the overall efficiency of the range hood 1.

[0071] 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, a second metal cover spaced within the first metal cover, at least one drain pipe and at least one cooling fan, 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, and 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 air outlet of the heat dissipation fan is connected to the heat dissipation air inlet. The inlet of the drain pipe is connected to the heat dissipation outlet, and the outlet of the drain pipe extends to the negative pressure area at the inlet 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 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.

4. The heat dissipation device for the electronic control board as described in claim 3, characterized in that, The upper and lower ends of the partition extend to the first metal cover and the second metal cover, respectively.

5. The heat dissipation device for the electronic control board as described in claim 3, characterized in that, The ends of the multiple partitions along the gas flow direction bend and extend toward the heat dissipation outlet.

6. The heat dissipation device for the electronic control board as described in claim 3, 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 opening of the drainage tube gradually increases in size along the direction of gas flow.

9. 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.

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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