CN218417096U

CN218417096U - Heat radiation structure

Info

Publication number: CN218417096U
Application number: CN202222369338.7U
Authority: CN
Inventors: 朱政; 徐飞冬
Original assignee: Delta Electronics Shanghai Co Ltd
Current assignee: Delta Electronics Shanghai Co Ltd
Priority date: 2022-09-06
Filing date: 2022-09-06
Publication date: 2023-01-31
Anticipated expiration: 2032-09-06

Abstract

The utility model provides a heat radiation structure. The heat dissipation structure comprises a box body, a centrifugal fan and a plurality of fins. The box body is provided with a heat dissipation surface. The centrifugal fan is arranged on the radiating surface and comprises a fan blade group, an air inlet and an air outlet, wherein the air inlet is perpendicular to the radiating surface and communicated to the air outlet, the fan blade group is driven to generate air flow, the air flow is guided to the air outlet through the air inlet, the air outlet faces to a first direction, and the first direction is parallel to the radiating surface. The fins are arranged on the radiating surface and are arranged at intervals, any two adjacent fins form an air channel, each fin comprises a first section and a second section, and the first section is arranged adjacent to the air outlet; the second section is connected with the corresponding first section and extends along a second direction, the second direction is perpendicular to the first direction and is parallel to the radiating surface, and the airflow is discharged through the air outlet sequentially through the first section and the second section.

Description

Heat radiation structure

Technical Field

The utility model relates to a power electronic technology field especially relates to a heat radiation structure suitable for family uses up to store up and fills dc-to-ac converter to the inside heat energy that produces of loss dc-to-ac converter effectively avoids the bulk temperature too high and causes the device to damage, maintains the reliability of system.

Background

With the successive proposal of double-carbon targets in countries around the world, the power generation ratio of new energy resources such as photovoltaic energy, wind power and the like is continuously increased, and the challenges of power dispatching and power grid stability are also followed. In order to meet the convenience of the household users, the market puts higher demands on the function diversification and the volume miniaturization of the inverter, and simultaneously, puts new challenges on the heat dissipation of the inverter.

The IGBT module and the transformer are used as main power devices of the inverter, and a large amount of heat is generated during operation, which causes the power devices integrated therein to generate heat and increase temperature. If the heat cannot be timely and effectively released, the overall temperature inside the inverter rises, the reliability of the system is reduced, and devices are seriously damaged.

Generally, the performance of the heat dissipation structure proposed for the inverter is mainly related to the contact area with air, and the larger the contact area is, the better the heat dissipation performance is. The factors influencing the contact area mainly include the height, thickness, width and other parameters of the fin. Axial flow fans are adopted in the heat dissipation structure of the traditional inverter, the occupied space is relatively large, and the requirement of the market on miniaturization of the inverter is not met. Secondly, the amount of wind pressure of the axial fan of equidimension is less than centrifugal fan, if the wind channel turns round many, convulsions distance and supply distance are far away, choose for use axial fan probably to appear the amount of wind pressure not enough, the not good condition of radiating effect. Moreover, axial fan's rotor is generally for exposing the installation, and is higher to the waterproof dustproof requirement of installation environment, does not conform to practical application demand.

On the other hand, the fins of the heat dissipation structure of the traditional inverter are mostly divided into two types of horizontal distribution and vertical distribution, and the density is consistent. However, due to the limitation of the horizontal and vertical arrangement of the fins, the fan cannot act on the inverter as much as possible. In order to further achieve the required heat dissipation effect, the heat dissipation structure of the conventional inverter may need to arrange a plurality of fans. Moreover, the fins are arranged horizontally and vertically, so that dead corners are easily formed, and wind generated by the fan cannot act on part of the fins, so that the heat dissipation effect is poor. Finally, because the heat generated by the inverter is not uniformly distributed, the fins distributed in a uniform density may cause a local higher temperature, but because the number of the fins is less, the heat exchange area is smaller, and the heat dissipation effect is not obvious.

Therefore, how to develop a heat dissipation structure suitable for a household light storage and charging inverter to effectively dissipate the heat energy generated inside the inverter, avoid the device damage caused by the over-high temperature of the whole inverter, and maintain the reliability of the system is an urgent subject in the art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a heat radiation structure suitable for family uses up to store up and fill dc-to-ac converter to the inside heat energy that produces of loss dc-to-ac converter effectively avoids the bulk temperature too high and causes the device to damage, maintains the reliability of system. Aiming at the position of a main heating device in the household light storage and charging inverter, the temperature rise condition of each component in the inverter and the air outlet air speed are integrated, and the plurality of fins are optimally arranged. The fins are inclined at an acute angle relative to the first section of the horizontal air outlet, so that the horizontal airflow blown out from the air outlet of the centrifugal fan has a certain angle with the first section of the fins, the airflow can be blown into the air channel among the fins better, the on-way resistance loss is reduced, and the dead angle is avoided. The plurality of fins are longitudinally distributed corresponding to the second section connected with the first section, and the arrangement density of the second section of the plurality of fins is higher than that of the first section of the plurality of fins. Because the IGBT module and the transformer in the box body are mainly arranged corresponding to the second sections of the fins, and the arrangement density of the second sections of the fins is dense, the design is favorable for effectively increasing the contact area in a limited space. Moreover, the plurality of fins are longitudinally distributed in the second section, so that the heat exchange area is effectively increased, and meanwhile, the airflow in the air channel can be guided upwards, so that the air sucked by the centrifugal fan can be applied to the DCDC box part of the inverter and can be further applied upwards to the power module box body of the inverter above, the overall working thermal environment of the inverter is reduced, the reliability of the system is maintained, and the purpose of strengthening the competitiveness of products is achieved.

Another object of the present invention is to provide a heat dissipation structure suitable for an household light storage charging inverter. The centrifugal fan with the compact IP68 grade is adopted to replace the traditional axial fan, so that good waterproof and dustproof performance is provided, meanwhile, the centrifugal fan has the advantages of large air volume, low noise and the like, the height of the fins can be effectively reduced, and the effect of reducing the whole volume and weight of the inverter is achieved. On the other hand, in order to prevent dead leaves and large-particle impurities from falling into the air channel between the fins from the top and blocking the air channel, cover plates and metal grids can be arranged on the plurality of fins, the large-particle impurities are effectively blocked from entering the centrifugal fan, and the centrifugal fan is prevented from being damaged. In addition, the cover plate is further provided with a rectangular air outlet notch and an extension piece to change the flow direction of the air flow, so that most of the air flow is blown out of the air outlet notch. Because the gap still exists between the heat dissipation surface of extension piece and box, not complete laminating, still can provide the inverter power module box that the air current upwards acted on the top, reach the holistic operational thermal environment of reduction inverter to strengthen the mesh of the competitiveness of the product.

To achieve the above objective, the present disclosure provides a heat dissipation structure, which includes a box, a centrifugal fan, and a plurality of fins. The box body is provided with a heat dissipation surface. The centrifugal fan is arranged on the radiating surface and comprises a fan blade group, an air inlet and an air outlet, wherein the air inlet is perpendicular to the radiating surface and communicated to the air outlet, the fan blade group is driven to generate air flow, the air flow is guided to the air outlet through the air inlet, the air outlet faces to a first direction, and the first direction is parallel to the radiating surface. The fins are arranged on the radiating surface and are arranged at intervals, any two adjacent fins form an air channel, each fin comprises a first section and a second section, and the first sections of the fins are arranged at the air outlet in an adjacent mode; the second sections of the fins are connected with the corresponding first sections and extend along a second direction, the second direction is perpendicular to the first direction and is parallel to the radiating surface, and the airflow is discharged through the first sections of the fins and the second sections of the fins in sequence from the air outlet.

In an embodiment, the extending direction of the first sections of the plurality of fins forms an acute inclination angle with the first direction, and the acute inclination angle ranges from 1 degree to 5 degrees.

In one embodiment, the acute angle of inclination is 3 degrees.

In one embodiment, a first section air channel is formed between the first sections of any two adjacent fins; a second section air duct is formed between the second sections of any two adjacent fins, wherein the width of the first section air duct is larger than that of the second section air duct.

In one embodiment, the arrangement pitch of the first sections of any two adjacent fins is greater than the arrangement pitch of the second sections of any two adjacent fins.

In one embodiment, each of the fins further includes a third segment connected between the first segment and the second segment, the third segment being arc-shaped.

In an embodiment, the heat dissipation structure further includes a cover plate detachably disposed on the box body, parallel to the heat dissipation surface, and covering the plurality of fins and the air channels between adjacent fins.

In one embodiment, the cover plate includes an air inlet notch spatially opposite to the air inlet of the centrifugal fan, and the air inlet is exposed through the air inlet notch when the cover plate is fixed on the box body.

In an embodiment, the heat dissipation structure further includes a metal mesh grid disposed on the air inlet slot.

In one embodiment, the cover plate includes an extension piece adjacent to the end of the second section of the plurality of fins, extending from the plane of the cover plate contacting the plurality of fins toward the heat dissipation surface, and a gap is formed between the extension piece and the heat dissipation surface.

In one embodiment, the housing is an inverter DCDC housing containing an IGBT module and transformer of a light storing and charging inverter thermally coupled to the heat sink surface and spatially opposite the second section of the plurality of fins.

In an embodiment, the case is further connected to an inverter power module case, and is disposed adjacent to the gap, wherein the inverter power module case further includes a plurality of heat dissipation fins spatially arranged at intervals with respect to the gap, and extending along the second direction.

In one embodiment, the cover plate further includes an air outlet slot disposed adjacent to the extension piece and exposing a portion of the second section of the plurality of fins to allow the airflow to flow along a third direction, the third direction being perpendicular to the first direction and perpendicular to the second direction.

In one embodiment, the case includes a first fastening member, the cover includes a second fastening member, the first fastening member and the second fastening member are fastened to each other so that the cover is fixed to the case, and the plurality of fins are connected between the cover and the heat dissipating surface.

In one embodiment, the thickness of the plurality of fins ranges from 2mm to 3mm.

In an embodiment, the box further includes a retaining wall, which is provided with a heat dissipating surface, surrounds a portion of the outer periphery of the centrifugal fan, is connected to the outer sides of the plurality of fins, and is configured to form the air outlet.

The beneficial effects of the utility model reside in that, the embodiment of the utility model provides a heat radiation structure suitable for the family uses up the storage and fills dc-to-ac converter to the inside heat energy that produces of loss dc-to-ac converter effectively avoids the bulk temperature too high and causes the device to damage, maintains the reliability of system. Aiming at the position of a main heating device in the household light storage and charging inverter, the temperature rise condition of each component in the inverter and the air outlet air speed, the plurality of fins are optimally arranged. The fins incline at an acute inclined angle relative to the first section for horizontal air outlet, so that a certain angle is formed between the horizontal airflow blown out from the air outlet of the centrifugal fan and the first sections of the fins, the airflow can be better blown into an air duct among the fins, the on-way resistance loss is reduced, and dead angles are avoided.

Drawings

Fig. 1 schematically shows a perspective view of a heat dissipation structure according to an embodiment of the present invention.

Fig. 2 schematically shows an exploded view of the heat dissipation structure according to the embodiment of the present invention.

Fig. 3 schematically shows a front view of the heat dissipation structure of the present invention with the cover plate removed.

Fig. 4 schematically illustrates a schematic diagram of the heat dissipation structure of the embodiment of the present disclosure connected to another box.

Fig. 5 is a schematic view illustrating the heat dissipation structure of the present embodiment detached from other box bodies.

The reference numbers are as follows:

1: heat radiation structure

10: box body

11: heat radiation surface

12: retaining wall

13: first locking element

14: top side

20: centrifugal fan

21: air inlet

22: fan blade set

23: air outlet

30: fin

31: the first section

32: second section

33: third section

40: air duct

41: first section air duct

42: second section air duct

43: third section air duct

50: cover plate

51: extension piece

52: air outlet notch

53: inlet slot

54: second locking element

60: metal net grid

2: inverter power module box

3: radiating fin

A: acute angle of inclination

G: gap

W1, W2: width of

X, Y, Z: coordinate axes

Detailed Description

Exemplary embodiments that embody the features and advantages of the present invention will be described in detail in the description of the later sections. It is to be understood that the invention is capable of modification in various forms without departing from the scope of the invention and that the description and drawings are to be taken as illustrative and not restrictive in character. For example, the following description of the present disclosure describes the placement of a first feature over or on a second feature, including embodiments in which the first and second features are placed in direct contact, and also includes embodiments in which additional features can be placed between the first and second features, such that the first and second features may not be in direct contact. In addition, repeated reference characters and/or designations may be used in various embodiments of the disclosure. These repetitions are for simplicity and clarity and are not intended to limit the relationship between the various embodiments and/or the appearance structures. Furthermore, spatially relative terms, such as "upper," "lower," "left," "right," and the like, may be used herein for convenience in describing the relationship of one element or feature to another element(s) or feature(s) in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The device may be otherwise oriented (e.g., rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly. Further, when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may be present. Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the disclosure are approximations, the numerical values set forth in the specific examples are reported as precisely as possible. In addition, it is to be understood that although the terms "first", "second", "third", etc. may be used in the claims to describe various elements, these elements should not be limited by these terms, and the elements described in the embodiments are denoted by different reference numerals. These terms are for the respective different components. For example: a first component may be termed a second component, and similarly, a second component may be termed a first component without departing from the scope of the embodiments. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. Except in the operating/working examples, or unless explicitly stated otherwise, all numerical ranges, amounts, values and percentages disclosed herein (e.g., those percentages of angles, time durations, temperatures, operating conditions, ratios of amounts, and the like) are to be understood as modified in all embodiments by the term "about" or "substantially". Accordingly, unless indicated to the contrary, the numerical parameters set forth in the present disclosure and attached claims are approximations that may vary as desired. For example, each numerical parameter should at least be construed in light of the number of reported significant digits and by applying ordinary rounding techniques. Ranges may be expressed herein as from one end point to the other end point or between the two end points. All ranges disclosed herein are inclusive of the endpoints unless otherwise specified.

Fig. 1 schematically shows a perspective view of a heat dissipation structure according to an embodiment of the present invention. Fig. 2 schematically shows an exploded view of the heat dissipation structure according to the embodiment of the present disclosure. Fig. 3 schematically shows a front view of the heat dissipation structure of the present invention with the cover plate removed. The present application provides a heat dissipation structure 1 suitable for a household light storage and charging inverter. In the present embodiment, the heat dissipation structure 1 includes a box 10, a centrifugal fan 20, and a plurality of fins 30. The case 10 has a heat radiating surface 11. The centrifugal fan 20 is provided on the heat radiating surface 11. The centrifugal fan 20 includes a fan blade set 22, an air inlet 21 and an air outlet 23, wherein the air inlet 21 is perpendicular to the heat dissipating surface 11 and is connected to the air outlet 23. In the present embodiment, when the fan blade set 22 is driven by a motor (not shown) to drive the fan blades to rotate, the air flow generated by the rotation of the fan blades can be vertically sucked into the centrifugal fan 20 from the air inlet 21, and then guided to the air outlet 23 from the air inlet 21 to form a horizontal air outlet. In the present embodiment, the air outlet 23 faces a first direction, such as an X-axis direction, which is parallel to the heat dissipating surface 11, that is, the air flow guided by the centrifugal fan 20 flows along the first direction (the X-axis direction). The plurality of fins 30 are provided on the heat dissipating surface 11, for example, at a height close to the centrifugal fan 20 along the Z axis, and are arranged at intervals. In the present embodiment, the thickness of the plurality of fins 30 ranges from 2mm to 3mm. Of course, the thickness of the fins 30 can be varied according to the application. It should be noted that the plurality of fins 30 are designed more optimally with respect to the horizontal air outlet of the air outlet 23 of the centrifugal fan 20. Wherein any two adjacent fins 30 form a wind tunnel 40. In the present embodiment, each of the fins 30 includes a first section 31 and a second section 32, the first sections 31 of the plurality of fins 30 are disposed adjacent to the air outlet 23 of the centrifugal fan 20, and the extending direction and the first direction (X-axis direction) form an inclined acute angle a. Wherein the acute tilt angle a ranges from 1 to 5 degrees. Preferably, when the acute inclination angle a is 3 degrees, the first sections 31 of the plurality of fins 30 can further guide the air flow to smoothly blow into the air duct 40 between the fins 30, so as to reduce the on-way resistance loss and avoid the generation of dead corners. In addition, the second sections 32 of the plurality of fins 30 are connected to the corresponding first sections 31 and extend in a second direction, such as the Y-axis direction, which is perpendicular to the first direction and parallel to the heat dissipation surface 11. Therefore, the airflow generated by the centrifugal fan 20 can be discharged through the air outlet 23 sequentially passing through the first sections 31 of the plurality of fins 30 and the second sections 32 of the plurality of fins 30.

In the present embodiment, a first section air channel 41 is formed between the first sections 31 of any two adjacent fins 30; the second section 32 of any two adjacent fins 30 forms a second section wind channel 42, wherein the width W1 of the first section wind channel 41 is greater than the width W2 of the second section wind channel 42. In other words, in the present embodiment, the arrangement pitch of the first sections 31 of any two adjacent fins 30 is greater than the arrangement pitch of the second sections 32 of any two adjacent fins 30. The longitudinally disposed second sections 32 have a higher packing density. It should be noted that the heat dissipation structure 1 of the present invention is suitable for a household light storage and charging inverter, and the box 10 is, for example, but not limited to, an inverter DCDC box, and houses an IGBT module and a transformer (not shown) of the light storage and charging inverter, which are thermally coupled to the heat dissipation surface 11 from the inside of the box 10 and spatially face the second section 31 of the plurality of fins 30. That is, the heat dissipation surface 11 is directly in thermal contact with the heat generating device at the back surface of the second section 31 opposite to the plurality of fins 30. Since the IGBT module and the transformer in the case 10 are mainly disposed corresponding to the second sections 32 of the plurality of fins 30, and the second sections 32 of the plurality of fins 30 are arranged densely, such a design contributes to effectively increasing the contact area in a limited space. Moreover, the second sections 32 of the plurality of fins 30 distributed longitudinally not only effectively increase the heat exchange area, but also guide the airflow in the air duct 40 from the transverse first section air duct 41 to the longitudinal second section air duct 42 for upward discharge, so that the airflow sent out from the air outlet 23 by the centrifugal fan 20 can be fully applied to the first sections 31 and the second sections 32 of the fins 30, and the heat dissipation effect is effectively improved.

In the present embodiment, each fin 30 further includes a third section 33 connected between the first sections 31 arranged in the transverse direction and the second sections 32 arranged in the longitudinal direction. The third section 33 is arc-shaped, and a smoothly bent third section air duct 43 is further formed between the third sections 33 of any two adjacent fins 30 and is communicated between the first section air duct 41 and the second section air duct 42, so that a dead angle generated when the air flow flows in the air duct 40 is avoided, and the air flow sent out by the air outlet 23 of the centrifugal fan 20 can be fully applied to the fins 30.

In the present embodiment, the heat dissipation structure further includes a cover plate 50 detachably disposed on the box 10, parallel to the heat dissipation surface 11, and covering the plurality of fins 30 and the air duct 40 therebetween, so as to prevent the airflow sent by the air outlet 23 of the centrifugal fan 20 from overflowing from the tops of the plurality of fins 30, and effectively acting on the first section 31, the third section 33, and the second section 32 of each fin 30. In the present embodiment, the cover plate 50 includes an extending piece 51, which is disposed adjacent to the end of the second section 32 of the plurality of fins 30, and extends from the plane where the cover plate 50 contacts the plurality of fins 30 toward the heat dissipating surface 11, so as to block the airflow flowing along the second direction (Y-axis direction). In the present embodiment, the cover plate 50 further includes a rectangular air outlet slot 52 disposed adjacent to the extension 51 and exposing the end of the second section 32 of the plurality of fins 30 to allow the airflow to flow along a third direction, such as the Z-axis direction. The third direction is perpendicular to the first direction and perpendicular to the second direction. Therefore, the airflow sent out from the air outlet 23 by the centrifugal fan 20 can sufficiently act on the first section 31, the third section 33 and the second section 32 of the fin 30, and the airflow direction can be changed as required. Of course, the present disclosure is not limited thereto. In the present embodiment, a gap G is formed between the extending piece 51 and the heat dissipating surface 11. Because there is still a gap G between the extension piece 51 and the heat dissipation surface 11 of the box 10, and the gap is not completely attached, a part of the airflow is still allowed to continue flowing along the second direction (Y-axis direction) or act on other objects needing heat dissipation again.

In this embodiment, the centrifugal fan 20 is an IP 68-grade centrifugal fan, and different from a conventional axial fan, the centrifugal fan 20 further provides good waterproof and dustproof properties, and has the advantages of large air volume, low noise, and the like, so that the height of the fins can be effectively reduced, and the overall size and weight of the inverter can be reduced. On the other hand, when the rotation of the fan blade set 22 is viewed from above the air inlet 21 of the centrifugal fan 20, the fan blade set 22 rotates clockwise, and the design of the inclined acute angle a of the first section 31 of the fin 30 is matched, so that the airflow blown out from the air outlet 23 by the centrifugal fan 20 can be guided into the air duct 40 between the fins 30 more smoothly, the loss of resistance along the way is reduced, and the generation of dead corners is avoided. In this embodiment, the box 10 further includes a retaining wall 12 disposed on the heat dissipating surface 11, surrounding a portion of the outer periphery of the centrifugal fan 20, and connected to the outer sides of the plurality of fins 30 to form the air outlet 23. Of course, the formation of the air outlet 23 is not limited thereto. In other embodiments, the fins 30 may be connected to the centrifugal fan 20 to form the air outlet 23, for example, but the invention is not limited thereto. In addition, in the embodiment, the cover plate 50 further includes a circular air inlet 53 spatially opposite to the air inlet 21 of the centrifugal fan 20, and when the cover plate 50 is fixed on the box 10, the air inlet 21 is exposed through the air inlet 53. In this embodiment, the heat dissipation structure 1 further includes a metal grid 60 disposed on the air inlet 53. Through the arrangement of the cover plate 50 and the metal mesh grid 60, the heat dissipation structure 1 can prevent dead leaves and large-particle impurities from falling into the air duct 40 between the fins 30 from the top to block the air duct 40, and also can effectively prevent the large-particle impurities from entering the centrifugal fan 20 from the air inlet 21, thereby avoiding the damage to the centrifugal fan 20. Of course, the present disclosure is not limited thereto.

In the embodiment, the box 10 includes a first fastening element 13, the cover 50 includes a second fastening element 54, the first fastening element 13 and the second fastening element 54 are spatially opposite to each other, the first fastening element 13 and the second fastening element 54 are fastened to each other, so that the cover 50 is fixed on the box 10, abuts against the tops of the fins 30, and the fins 51 are connected between the cover 50 and the heat dissipating surface 11. Of course, the way in which the cover plate 50 is fixed to the box 10 by the first and

second locking members

13 and 54 can be changed according to the actual application requirements. The present disclosure is not limited thereto and will not be described in detail.

Fig. 4 schematically illustrates a schematic diagram of the heat dissipation structure of the embodiment of the present disclosure connected to another box. Fig. 5 is a schematic view illustrating the heat dissipation structure of the present embodiment detached from other box bodies. Refer to fig. 1 to 5. In the present embodiment, the tank 10 is an inverter DCDC tank, and houses the IGBT module and the transformer of the light storage and charging inverter. As mentioned above, there is still a gap G between the extension piece 51 of the cover plate 50 and the heat dissipating surface 11, which is not completely attached, so that a part of the airflow is still allowed to continue flowing along the second direction (Y-axis direction) or act on other objects to be dissipated. In the present embodiment, the gap G is adjacent to the top side 14 of the casing 10, and the top side 14 of the casing 10 is further connected to a Power head (inverter) casing 2, so that the inverter Power module casing 2 is adjacent to the gap G. Because the gap G still exists between the extension piece 51 of the cover plate 50 and the heat dissipation surface 11 of the case 10, and the gap G is not completely attached, the air flow can still be provided to continue to act on the inverter power module case 2 above the top side 14 along the second direction (Y-axis direction), and the purposes of reducing the overall working thermal environment of the inverter and strengthening the competitiveness of the product are achieved. In the present embodiment, the inverter power module case 2 further includes a plurality of heat dissipation fins 3 spatially arranged at intervals with respect to the gap G and extending along the second direction (Y-axis direction). Of course, the derivative applications of the heat dissipation structure 1 can be formed by any of the aforementioned embodiments or further modified according to the actual application requirements.

It should be noted that, in the present application, an optimal arrangement mode is adopted for the position of the main heating device in the household light storage and charging inverter, the temperature rise condition of each component in the inverter and the wind speed of the air outlet 23. Since the heat dissipation performance of the heat dissipation structure 1 is related to the contact area between the plurality of fins 30 and the air, the factors affecting the contact area include the height, thickness, width, and other parameters of the fins 30. In the present embodiment, the thickness of the fin 30 ranges from 2mm to 3mm, and the height can be adjusted according to the height of the centrifugal fan 20, so that the cover plate 51 is fixed to the box 10. Of course, the height, thickness and width of the fins 30 can be adjusted according to the actual application requirements. The present disclosure is not limited thereto, and will not be described herein again.

To sum up, the embodiment of the utility model provides a heat radiation structure suitable for family uses up light storage and fills dc-to-ac converter to the inside heat energy that produces of loss dc-to-ac converter effectively avoids the bulk temperature too high and causes the device to damage, maintains the reliability of system. Aiming at the position of a main heating device in the household light storage and charging inverter, the temperature rise condition of each component in the inverter and the air outlet air speed, the plurality of fins are optimally arranged. The fins are inclined at an acute angle relative to the first section of the horizontal air outlet, so that the horizontal airflow blown out from the air outlet of the centrifugal fan has a certain angle with the first section of the fins, the airflow can be blown into the air channel among the fins better, the on-way resistance loss is reduced, and the dead angle is avoided. The plurality of fins are longitudinally distributed corresponding to the second section connected with the first section, and the arrangement density of the second section of the plurality of fins is higher than that of the first section of the plurality of fins. Because the IGBT module and the transformer in the box body are mainly arranged corresponding to the second sections of the fins, and the arrangement density of the second sections of the fins is dense, the design is favorable for effectively increasing the contact area in a limited space. Moreover, the plurality of fins are longitudinally distributed in the second section, so that the heat exchange area is effectively increased, and meanwhile, the airflow in the air channel can be guided upwards, so that the air sucked by the centrifugal fan can be applied to the DCDC box part of the inverter and can be further applied upwards to the power module box body of the inverter above, the overall working thermal environment of the inverter is reduced, the reliability of the system is maintained, and the purpose of strengthening the competitiveness of products is achieved. This case adopts the centrifugal fan of tight type IP68 grade to replace traditional axial fan to provide good waterproof, dirt resistance, still have the amount of wind big, noise low grade advantage simultaneously, more can effectual reduction fin height, reach the effect that reduces the whole volume of dc-to-ac converter and weight. On the other hand, in order to prevent dead leaves and large-particle impurities from falling into the air channel between the fins from the top and blocking the air channel, cover plates and metal grids can be arranged on the plurality of fins, the large-particle impurities are effectively blocked from entering the centrifugal fan, and the centrifugal fan is prevented from being damaged. In addition, the cover plate is further provided with a rectangular air outlet notch and an extension piece for changing the flow direction of the air flow, so that most of the air flow is blown out of the air outlet notch. Because the gap still exists between the heat dissipation surface of extension piece and box, not complete laminating, still can provide the inverter power module box that the air current upwards acted on the top, reach the holistic operational thermal environment of reduction inverter to strengthen the mesh of the competitiveness of the product.

Exemplary embodiments of the present invention have been particularly shown and described above. It is to be understood that the invention is not to be limited to the disclosed embodiments, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. A heat dissipation structure, comprising:

a box body with a heat dissipation surface;

the centrifugal fan is arranged on the radiating surface and comprises a fan blade group, an air inlet and an air outlet, the air inlet is vertical to the radiating surface and is communicated with the air outlet, the fan blade group is driven to generate an air flow which is guided to the air outlet from the air inlet, the air outlet faces to a first direction, and the first direction is parallel to the radiating surface; and

a plurality of fins arranged on the radiating surface and arranged at intervals, wherein any two adjacent fins form an air channel, each fin comprises a first section and a second section, and the first sections of the fins are adjacent to the air outlet; the second sections of the fins are connected with the corresponding first sections and extend along a second direction, the second direction is perpendicular to the first direction and is parallel to the radiating surface, and the airflow is discharged from the air outlet sequentially through the first sections of the fins and the second sections of the fins.

2. The heat dissipating structure of claim 1, wherein the first section of the plurality of fins extends at an acute angle with respect to the first direction, the acute angle ranging from 1 degree to 5 degrees.

3. The heat dissipating structure of claim 2, wherein the acute inclined angle is 3 degrees.

4. The heat dissipating structure of claim 1, wherein a first section of air channel is formed between the first sections of any two adjacent fins; a second section air channel is formed between the second sections of any two adjacent fins, wherein the width of the first section air channel is larger than that of the second section air channel.

5. The heat dissipation structure of claim 1, wherein the first section of any two adjacent fins has a larger arrangement pitch than the second section of any two adjacent fins.

6. The heat dissipating structure of any one of claims 1 to 5, wherein each of the fins further comprises a third section connected between the first section and the second section, the third section having a circular arc shape.

7. The heat dissipating structure of claim 1, further comprising a cover plate detachably disposed on the case, parallel to the heat dissipating surface, and covering the plurality of fins and the air channel between adjacent fins.

8. The heat dissipating structure of claim 7, wherein the cover plate comprises an air inlet slot spatially opposite to the air inlet of the centrifugal fan, and the air inlet is exposed through the air inlet slot when the cover plate is fixed on the housing.

9. The heat dissipating structure of claim 8, further comprising a metal grid disposed on the air inlet.

10. The heat dissipating structure of claim 7, wherein the cover plate comprises an extension piece adjacent to the end of the second section of the plurality of fins, extending from the plane of the cover plate in contact with the plurality of fins toward the heat dissipating surface, and a gap is formed between the extension piece and the heat dissipating surface.

11. The heat dissipating structure of claim 1 or 10, wherein the case is an inverter DCDC case housing an IGBT module and transformer of a light storing and charging inverter thermally coupled to the heat dissipating surface and spatially opposite the second section of the plurality of fins.

12. The heat dissipation structure of claim 11, wherein the case is further coupled to an inverter power module case adjacent to the gap, wherein the inverter power module case further includes a plurality of heat dissipation fins spaced apart from each other with respect to the gap and extending in the second direction.

13. The heat dissipating structure of claim 10, wherein the cover plate further comprises an air outlet slot disposed adjacent to the extension piece and exposing a portion of the second section of the plurality of fins to allow the airflow to flow along a third direction, the third direction being perpendicular to the first direction and perpendicular to the second direction.

14. The heat dissipating structure of claim 7, wherein the case includes a first fastening member, the cover includes a second fastening member, the first fastening member and the second fastening member are fastened to each other so that the cover is fixed to the case, and the plurality of fins are connected between the cover and the heat dissipating surface.

15. The heat dissipation structure of claim 1, wherein the plurality of fins have a thickness ranging from 2mm to 3mm.

16. The heat dissipating structure of claim 1, wherein the housing further comprises a retaining wall, which is disposed around a portion of the periphery of the centrifugal fan and connected to the outside of the plurality of fins to form the air outlet.