Heat dissipation device and photovoltaic inverter

Abstract

The heat dissipation device comprises a shell, the shell is provided with an air inlet duct and a heating cavity located on the outer side of the air inlet duct, the air inlet duct is suitable for cold air to enter, the heating cavity is internally provided with a heating element so that the heating cavity can have a relatively high temperature, and the air inlet duct is suitable for cold air to enter so that the heating cavity can have a relatively high temperature. When the heating cavity is heated, the temperature inside the heating cavity is low, the heating cavity can conduct heat to the air inlet channel so as to take away heat, further, a heat dissipation mechanism is arranged on the wall face of the air inlet channel so that the heating cavity can dissipate heat through the air inlet channel, heat dissipation is enhanced through the effect of the heat dissipation mechanism, and therefore the heat dissipation effect of the heating cavity is better.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of electrical equipment, concretely relates to heat dissipation device and photovoltaic inverter. BACKGROUND

[0002] In prior art, photovoltaic inverter will usually set up air inlet air duct in its inside to guide wind to different positions, cold air is usually inputted from outside in air inlet air duct to heat dissipation element inside photovoltaic inverter to carry out heat dissipation, because heat dissipation element inside photovoltaic inverter is more, therefore air inlet air duct outside is usually also higher temperature, air inlet air duct outside will conduct heat to air inlet air duct to carry out auxiliary heat dissipation through air inlet air duct, however heat dissipation efficiency is low under this mode, and heat dissipation effect is not obvious. SUMMARY

[0003] The utility model discloses a heat dissipation device and photovoltaic inverter to overcome the above-mentioned defects or problems in the background art.

[0004] To achieve the above object, the utility model and its preferred embodiment adopt the following technical scheme, but the embodiment is not limited to the following scheme:

[0005] Scheme one, a heat dissipation device, comprising

[0006] Shell, which is provided with air inlet air duct and heat cavity located on the outside of the air inlet air duct, the air inlet air duct is suitable for cold air, the wall surface of the air inlet air duct is provided with heat dissipation mechanism, so that the heat cavity carries out heat dissipation through the air inlet air duct.

[0007] Scheme two, based on scheme one, the heat dissipation mechanism is radiator, and the radiator is fixed in the air inlet air duct.

[0008] Scheme three, based on scheme one, the heat dissipation mechanism is rolling rib, and the rolling rib is provided to the air inlet air duct to increase the inner wall area and outer wall area of the air inlet air duct.

[0009] Scheme four, based on scheme one, further comprising heat generating assembly and fan assembly;The shell further comprises cover body, the cover body is communicated with the air inlet air duct, and the heat cavity is located on the outside of the cover body,

[0010] The heat generating assembly is placed in the cover body, and the heat generating assembly comprises a plurality of heat generating parts arranged in a first direction in sequence;

[0011] The fan assembly is placed in the cover body, and the air inlet end or air outlet end of the fan assembly corresponds to each heat generating part, and the air inlet end of the fan assembly is communicated with the air inlet air duct to dissipate heat for the heat generating assembly.

[0012] Scheme five, based on scheme four, the heat generating component includes a first heat generating element, a second heat generating element and a third heat generating element arranged in sequence along the first direction and having the same specification;

[0013] The fan assembly includes a first fan and a second fan,

[0014] The first fan is provided with a first end, which is the air inlet end or air outlet end of the first fan, corresponding to the first heat generating element and the second heat generating element, and the area corresponding to the first heat generating element is twice that corresponding to the second heat generating element;

[0015] The second fan is provided with a second end, which is the air inlet end or air outlet end of the second fan, corresponding to the second heat generating element and the third heat generating element, and the area corresponding to the third heat generating element is twice that corresponding to the second heat generating element, and the area corresponding to the second heat generating element is equal to that corresponding to the second heat generating element.

[0016] Scheme six, based on scheme five, the first end and the second end are located on both sides of the first face respectively, the first face is perpendicular to the first direction, and the distance from the first heat generating element and the third heat generating element to the first face is equal.

[0017] Scheme seven, based on scheme six, the first end and the second end are symmetrically arranged relative to the first face and located in the upper or lower area of the heat generating component.

[0018] Scheme eight, based on scheme five, the shell is further provided with a first air outlet, the air inlet duct is provided with a first air inlet, the first air inlet and the first air outlet are used for heat dissipation air inlet and heat dissipation air outlet of the heat generating component, the first air outlet is located at the lower end of the shell, and the first air inlet is located above the first air outlet.

[0019] Scheme nine, a photovoltaic inverter, comprising a heat dissipation device according to any one of schemes one to eight; the heat generating cavity is used for arranging high protection electrical components, the air inlet duct is used for heat dissipation of low protection electrical components, the shell is provided with an air inlet and an air outlet for heat exchange, and the air inlet and the air outlet are isolated.

[0020] Scheme ten, based on scheme nine, the air inlet and the air outlet are not located on the same wall of the shell; or the air inlet and the air outlet are located on the same wall of the shell, and the air inlet and the air outlet are located in the middle and lower parts of the shell respectively, or the upper and lower parts of the shell; or the air inlet and the air outlet are located on the same wall of the shell, and the air inlet path and the air outlet path of the air outlet do not coincide.

[0021] From the above description of the utility model and its preferred embodiments, relative to the prior art, the technical scheme of the utility model and its preferred embodiments have the following beneficial effects due to the following technical means:

[0022] 1. In the first scheme and its preferred implementation, a heat dissipation device includes a shell,

[0023] The shell is provided with an air inlet duct and a heating cavity located outside the air inlet duct. The air inlet duct is suitable for cold air inlet. The heating cavity has a relatively high temperature due to the internal heating element. The temperature inside the air inlet duct is relatively low because it is suitable for cold air inlet. The heating cavity conducts heat to the air inlet duct to carry away heat. Further, the wall surface of the air inlet duct is provided with a heat dissipation mechanism to dissipate heat from the heating cavity through the air inlet duct. The heat dissipation mechanism enhances heat dissipation, thereby improving the heat dissipation effect of the heating cavity.

[0024] 2. In the second scheme and its preferred implementation, the heat dissipation mechanism is a radiator, which is fixed to the air inlet duct to realize heat dissipation of the heating cavity through the radiator and improve the heat dissipation effect of the heating cavity.

[0025] 3. In the third scheme and its preferred implementation, the heat dissipation mechanism is a rolling rib, which is protruded into the air inlet duct to increase the inner wall area and outer wall area of the air inlet duct. This increases the heat exchange area and further reduces the temperature of the heating cavity. At the same time, due to the weak wind speed in the air inlet duct, the internal airflow is mainly laminar flow (with poor heat exchange effect). The rolling rib protruded into the air inlet duct can further disturb the airflow and enhance heat exchange. In addition, the rolling rib can also increase the strength of the air inlet duct.

[0026] 4. In the fourth scheme and its preferred implementation, the fan assembly and the heating assembly are placed in the cover body. The heating assembly includes a plurality of heating elements arranged in sequence along a first direction. Each heating element is arranged in sequence, so that in addition to the heat generated by each heating element, heat is also radiated to the adjacent heating element. In this scheme, the air inlet end or the air outlet end of the fan assembly corresponds to each heating element, so that each heating element can have good heat dissipation, reducing the temperature difference between each heating element and other heating elements. Moreover, the air inlet end or the air outlet end directly corresponds to the heating element, which has better heat dissipation effect than the heat dissipation of the cavity where the heating element is located.

[0027] 5. In the fifth scheme and its preferred implementation, a heat dissipation device includes a first fan and a second fan.

[0028] The heating assembly includes a first heating element, a second heating element, and a third heating element arranged in sequence along a first direction and having the same specifications. The same specifications mean that the first heating element, the second heating element, and the third heating element have the same size, power, and other parameters.

[0029] The first fan is used for heat dissipation of the heating components. The first fan is installed on the housing. The first fan has a first end, which is the air inlet or air outlet of the first fan. The first end corresponds to the first heating element and the second heating element, and the area of ​​the first end corresponding to the first heating element is twice the area corresponding to the second heating element.

[0030] The second fan is used for heat dissipation of the heating components. The second fan is installed in the housing and has a second end, which can be either the air inlet or outlet. The second end corresponds to the second and third heating elements, and the area of ​​the second end corresponding to the third heating element is twice the area corresponding to the second heating element. The area of ​​the second end corresponding to the second heating element is equal to the area of ​​the first end corresponding to the second heating element. Therefore, in summary, the fan areas corresponding to the first, second, and third heating elements are equal, and the heat dissipation area is the same, which can make the temperature of the first, second, and third heating elements more uniform and convenient to use.

[0031] When the first end is the air outlet of the first fan and the second end is the air outlet of the second fan, the heat generated by the heating element will not be discharged after passing through the first and second fans, which can increase the lifespan of the first and second fans.

[0032] 6. In Scheme 6 and its preferred embodiments, the first end and the second end are located on both sides of the first surface, the first surface is perpendicular to the first direction, and the distances from the first heating element and the third heating element to the first surface are equal. This allows the second heating element to be acted upon by the first fan and the second fan on both sides respectively. The side of the first heating element closer to the second heating element is acted upon by the first fan, and the side of the third heating element closer to the second heating element is acted upon by the second fan. Even if the first heating element and the third heating element radiate heat to the second heating element, the second heating element dissipates heat more evenly and has a better heat dissipation effect due to the way the second heating element is acted upon by the fans on both sides compared to the way the first heating element and the third heating element are acted upon by the fans on one side. This overcomes the influence of heat radiation and further makes the temperature of the first heating element, the second heating element, and the third heating element more uniform.

[0033] 7. In Scheme 7 and its preferred embodiments, the first end and the second end are symmetrically arranged relative to the first surface and located in the upper or lower region of the heating component. The first end and the second end do not protrude from the side of the heating component and do not occupy the side space. At the same time, the first end and the second end are completely aligned with the heating component, so as not to waste the heat dissipation area and make the heat dissipation effect better.

[0034] 8. In Scheme 8 and its preferred embodiments, when the heat dissipation device is used outdoors, sand and dust are easily accumulated around it, and the surface temperature is high due to sunlight. The first air outlet is located at the lower end of the casing, which helps to disperse the surrounding sand and dust. The first air inlet is located above the first air outlet, further away from the ground, making it less likely to draw in sand and dust. In addition, the upper air temperature is lower, ensuring that the temperature of the first air inlet is lower.

[0035] 9. In Scheme Nine and its preferred embodiments, a photovoltaic inverter includes the aforementioned heat dissipation device. A high-protection electrical component is housed within the heating cavity, and an air inlet duct dissipates heat from the low-protection electrical component. The housing is provided with an air inlet and an air outlet for heat exchange, which are isolated to prevent hot air from flowing back to the air inlet and affecting heat dissipation. The air inlet and air outlet may include the first air inlet and first air outlet referred to in Scheme Eight, and may also include air inlets and air outlets with heat exchange functions at other locations on the photovoltaic inverter.

[0036] 10. In Scheme 10 and its preferred embodiments, the air inlet and air outlet are not located on the same wall of the housing, thereby preventing hot air backflow.

[0037] Alternatively, the air inlet and outlet can be located on the same wall of the casing, with the inlet and outlet situated in the middle and lower parts of the casing, or the upper and lower parts, respectively. By increasing the distance between the air inlet and outlet, hot air backflow is prevented. Furthermore, when the air inlet is located in the middle or upper part of the casing, it ensures a low inlet temperature and reduces the intake of air heated by sunlight from the ground.

[0038] Alternatively, the air inlet and outlet may be located on the same wall of the casing, and the air inlet path and the air outlet path may not coincide. By changing the air inlet and outlet directions, hot air backflow can be prevented. Attached Figure Description

[0039] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 This is a perspective view of photovoltaic inverter mode 1 in Example 1;

[0041] Figure 2 This is a perspective view of the photovoltaic inverter method 1 in Embodiment 1 from another angle;

[0042] Figure 3 This is a three-dimensional view of the air inlet duct in Example 1;

[0043] Figure 4 is a perspective view of the first fan and the second fan in Embodiment One;

[0044] Figure 5 is a structural schematic view of the structure at the heat generating assembly in Embodiment One;

[0045] Figure 6 is a perspective view of the structure of the air inlet duct part in Embodiment One;

[0046] Figure 7 is a structural schematic view of the structure of the air inlet duct part in Embodiment One;

[0047] Figure 8 is a structural schematic view of the photovoltaic inverter in Embodiment One.

[0048] Main figure mark explanation:

[0049] housing 1; first air inlet 111; first air outlet 112; heat exchanger air inlet 121; heat exchanger air outlet 122; dry cooler air inlet 131; dry cooler air outlet 132; first wall 14; second wall 15; third wall 16; fourth wall 17; air inlet duct 18; rolling rib 181; ventilation cavity 19;

[0050] heat generating assembly 2; first heat generating member 21; second heat generating member 22; third heat generating member 23; first fan 3; first end 31; second fan 4; second end 41; first face 5; first direction 6; heat generating cavity 7; DETAILED DESCRIPTION

[0051] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are preferred embodiments of the present application, and should not be regarded as excluding other embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0052] In the claims, the specification, and the above drawings of the present application, unless otherwise explicitly defined, the terms such as "first", "second", or "third" are used only to distinguish different objects, and are not used to describe a specific order.

[0053] In the claims, the specification, and the drawings of the present application, terms such as "top", "bottom", "front", "back", "leading", "trailing", etc., if used, are used for convenience and are not intended to necessitate that the apparatus, the article, or the component referred to must have a particular orientation or be constructed and operated in a particular orientation unless otherwise explicitly stated.

[0054] In the claims, the specification, and the drawings of the present application, unless otherwise expressly specified, terms such as "fixedly connected" or "fixedly connected" should be interpreted broadly, that is, any connection mode between the two without displacement relationship and relative rotation relationship, that is, it includes non-detachable fixed connection, detachable fixed connection, integration and fixed connection through other devices or components.

[0055] In the claims, the specification, and the drawings of the present application, terms such as "including", "having" and their variants are intended to mean "including but not limited to".

[0056] Reference Figures 1-5 A photovoltaic inverter comprising a heat dissipation device, a heat exchanger and a dry cooler.

[0057] The heat dissipation device comprises a shell 1, a heating assembly 2 and a fan assembly.

[0058] The shell 1 is provided with corresponding cavities inside for mounting the heat exchanger, the dry cooler, the heating assembly 2 and the fan assembly.

[0059] The shell 1 is provided with a plurality of air inlets and air outlets for heat exchange, and the air inlets and air outlets are isolated to prevent the hot air sent out from the air outlets from flowing back to the air inlets, affecting heat dissipation. Figures 1-2 Specifically, the air inlets and air outlets can be isolated by one or a combination of the following ways: ① the air inlets and air outlets are not located on the same wall of the shell 1; ② the air inlets and air outlets are located on the same wall of the shell 1, and the air inlets and air outlets are located at the middle and lower parts of the shell 1, or the upper and lower parts of the shell 1, so as to realize mutual isolation by the large distance between the air inlets and air outlets; ③ the air inlets and air outlets are located on the same wall of the shell 1, and the air inlet path of the air inlet and the air outlet path of the air outlet do not coincide.

[0060] Reference Figures 1-2In this embodiment, there are three types of air inlets, namely the first air inlet 111, the heat exchanger air inlet 121 and the dry cooler air inlet 131, and there are also three types of air outlets, namely the first air outlet 112, the heat exchanger air outlet 122 and the dry cooler air outlet 132. Among them, the first air inlet 111 and the first air outlet 112 are used for heat dissipation air inlet and heat dissipation air outlet of the heating assembly 2, the heat exchanger air inlet 121 and the heat exchanger air outlet 122 are used for heat dissipation air inlet and heat dissipation air outlet of the heat exchanger, and the dry cooler air inlet 131 and the dry cooler air outlet 132 are used for heat dissipation air inlet and heat dissipation air outlet of the dry cooler.

[0061] The shell 1 is generally a cuboid and includes a first wall 14, a second wall 15, a third wall 16 and a fourth wall 17 connected in sequence. The first wall 14 is narrower than the second wall 15. Two ways of isolating the air inlets and air outlets of the photovoltaic inverters are provided as follows:

[0062] Method one: referring to Figures 1-2 The first wall 14 is provided with two first air inlets 111 (each air inlet can include a plurality of air inlets, and the same applies to other types of air inlets) and one heat exchanger air outlet 122. The heat exchanger air outlet 122 is located above the first air inlet 111. Since the first air inlet 111 and the heat exchanger air outlet 122 are close to each other, in this method, the first air inlet 111 is arranged obliquely downward to allow air to enter from the obliquely downward direction, and the heat exchanger air outlet 122 is arranged obliquely upward to allow air to exit from the obliquely upward direction. The second wall 15 is provided with two dry cooler air inlets 131 and two first air outlets 112. The dry cooler air inlets 131 and the first air outlets 112 are respectively located at the upper and lower ends of the shell 1. The third wall 16 is provided with a dry cooler air inlet 131, a heat exchanger air inlet 121 and a first air outlet 112 from top to bottom. The fourth wall 17 is provided with two dry cooler air inlets 131 and two first air outlets 112. Two dry cooler air outlets 132 are located at the top wall of the shell 1. Air inlets of the same type are located at the same height, and air outlets of the same type are located at the same height.

[0063] Method two: the first wall 14 is provided with a dry cooler air inlet 131, a heat exchanger air inlet 121 and two first air inlets 111 from top to bottom. The second wall 15 is provided with two dry cooler air inlets 131 and two first air outlets 112 from top to bottom. The third wall 16 is provided with a heat exchanger air outlet 122 and a first air outlet 112 from top to bottom. The fourth wall 17 is provided with two dry cooler air inlets 131 and two first air outlets 112. Two dry cooler air outlets 132 are located at the top wall of the shell 1. Air inlets of the same type are located at the same height, and air outlets of the same type are located at the same height.

[0064] In both of the above methods, the various air inlets are located in the middle or upper part of the casing 1 to prevent the intake of hot air generated by solar radiation from the ground. In addition to the specific methods described above, other methods may also be used, and the number of air inlets and outlets for each type may not be the same as those described above, which will not be elaborated on here.

[0065] refer to Figures 3-5 , Figure 8 The housing 1 also includes an air inlet duct 18 and a cover. The housing 1 has a heating chamber 7 located outside the cover and the air inlet duct 18. The heating chamber is used to house high-protection electrical components, such as capacitors and IGBT power transistors. The air inlet duct 18 is located inside the housing 1, and the air inside the air inlet duct 18 is supplied with cold air connected to the outside. The heating chamber 7 is located outside the air inlet duct 18, therefore the air outside the air inlet duct 18 is hot air (due to the heating element inside the heating chamber 7). The air inlet end of the air inlet duct 18 is the first air inlet 111. Preferably, refer to... Figure 6 , Figure 7 The air inlet duct 18 has ribs 181 protruding into it to increase the inner and outer wall areas. The ribs 181 can be formed by stamping. Two air inlet ducts 18 are spaced apart along a first direction 6, extending horizontally perpendicular to the first direction 6, where the first direction 6 is perpendicular to the second wall 15. The cover has a ventilation cavity 19 communicating with the air inlet ducts 18. Specifically, the ventilation cavity 19 is approximately located between and communicates with the two air inlet ducts 18. The bottom of the ventilation cavity 19 communicates with each first air outlet 112. Figure 2 As shown. The air inlet duct 18 is used to dissipate heat from low-protection electrical components inside the enclosure, such as reactor assemblies.

[0066] refer to Figure 5 The heating component 2 is installed inside the ventilation cavity 19 of the enclosure. The heating component 2 includes a plurality of heating elements arranged sequentially along a first direction. In this embodiment, the heating component 2 includes a first heating element 21, a second heating element 22, and a third heating element 23 arranged sequentially along the first direction 6 and having the same specifications. The same specifications mean that the first heating element 21, the second heating element 22, and the third heating element 23 have the same dimensions, power, and other parameters. Of course, in other embodiments, the heating component includes two or more heating elements. The first surface 5 is perpendicular to the first direction 6, and the distances from the first heating element 21 and the third heating element 23 to the first surface 5 are equal. At the same time, the portions of the second heating element 22 on both sides of the first surface 5 are the same. In this embodiment, the heating component 2 is a reactor assembly, and the first heating element 21, the second heating element 22, and the third heating element 23 are coils.

[0067] The fan assembly is installed inside the enclosure. The air inlet or outlet of the fan assembly corresponds to each heating element. Here, "corresponds" means that the projection of the air inlet or outlet of the fan assembly overlaps with the projection of the heating element.

[0068] In this embodiment, the fan assembly includes a first fan 3 and a second fan 4. In other embodiments, there may be more fans, or only one fan.

[0069] In this embodiment, the dry cooler, heat exchanger, first fan 3, and heating component 2 are arranged sequentially from top to bottom, wherein the second fan 4 and the first fan 3 are located at the same height.

[0070] In this embodiment, there are two air inlet ducts 18, which are respectively connected to the air inlet ends of the first fan 3 and the second fan 4. (See reference) Figure 5 The first fan 3 is installed on the housing 1. The first fan 3 has a first end 31, which is located in the ventilation cavity 19 and above the heating element 2. In this embodiment, the first end 31 is the air outlet of the first fan 3 to deliver cold air to the heating element 2. The first end 31 corresponds to the first heating element 21 and the second heating element 22. The area of ​​the first end 31 corresponding to the first heating element 21 is twice the area corresponding to the second heating element 22. That is, the area of ​​the first end 31 corresponding to the first heating element 21 is 2a, and the area corresponding to the second heating element 22 is a. In this embodiment, a is 1 / 3 of the projection of the first end 31 onto the heating element 2.

[0071] refer to Figure 5 The second fan 4 is installed on the housing 1. The second fan 4 has a second end 41, which is located in the ventilation cavity 19 and above the heating element 2 (in other embodiments, it may also be located below the heating element 2). In this embodiment, the second end 41 is the outlet end of the second fan 4 to deliver cold air to the heating element 2. The second end 41 corresponds to the second heating element 22 and the third heating element 23, and the area of ​​the second end 41 corresponding to the third heating element 23 is twice the area corresponding to the second heating element 22. The area of ​​the second end 41 corresponding to the second heating element 22 is equal to the area of ​​the first end 31 corresponding to the second heating element 23. The area corresponding to the heating element 22, that is, the area corresponding to the second end 41 and the third heating element 23, is 2a, while the area corresponding to the second heating element 22 is a. Therefore, in summary, the heat dissipation areas corresponding to the first heating element 21, the second heating element 22, and the third heating element 23 are all 2a. When the fan blows air, the air volume delivered to the first heating element 21, the second heating element 22, and the third heating element 23 is basically the same. Therefore, the heat dissipation of the first heating element 21, the second heating element 22, and the third heating element 23 is roughly equal, thereby making the temperature difference between the first heating element 21, the second heating element 22, and the third heating element 23 small.

[0072] Preferably, with reference to Figure 5 Further, the first end 31 and the second end 41 are symmetrically arranged relative to the first face 5, and the first end 31 and the second end 41 are located in the upper region of the heat generating assembly 2 (with the ground as the projection plane, the projection plane of the heat generating assembly 2 contains the projection plane of the first end 31 and the second end 41). In the embodiment, the first fan 3 and the second fan 4 are both centrifugal fans, the centrifugal fan takes in air along the axial direction and blows air along the periphery, and the lower region of the centrifugal fan corresponds to the heat generating assembly 2. Of course, in other embodiments, it can also be in other forms, for example, the centrifugal fan can be away from the heat generating assembly 2 and blow air or suck air to the heat generating assembly 2 through the ventilation pipeline, at this time, the opening of the ventilation pipeline in the ventilation cavity 19 is the first end 31 or the second end 41. The first end 31 and the second end 41 are located at the same height in the embodiment, and can be located at different heights in other embodiments.

[0073] In other embodiments, the first end 31 can be the air inlet end of the first fan 3, and the second end 41 can be the air inlet end of the second fan 4, so as to output the hot air generated by the heat generating assembly 2 to the outside of the shell 1, and as in the above-mentioned embodiment, the first fan 3 and the second fan 4 evenly distribute the air volume to the first heat generating element 21, the second heat generating element 22 and the third heat generating element 23, so that the air volume passing through the second heat generating element 22 is the same as the air volume passing through the first heat generating element 21 and the third heat generating element 23, thereby ensuring that the temperature difference of the first heat generating element 21, the second heat generating element 22 and the third heat generating element 23 is small.

[0074] Compared with the prior art, the embodiment has the following beneficial effects:

[0075] In an exemplary embodiment, a heat dissipation device includes a shell 1,

[0076] The shell 1 is provided with an air inlet duct 18 and a heat generating cavity 7 located outside the air inlet duct 18, the air inlet duct 18 is suitable for taking in cold air, and the heat generating cavity 7 has relatively high temperature due to the heat generating element inside. Therefore, the temperature inside the air inlet duct 18 is relatively low, and the heat generating cavity 7 conducts heat to the air inlet duct 18 to take away heat. Further, the shell 1 is provided with a heat dissipation mechanism on the wall surface of the air inlet duct 18, so that the heat dissipation mechanism can dissipate heat of the heat generating cavity 7 through the air inlet duct 18, and the heat dissipation mechanism can strengthen heat dissipation, thereby improving the heat dissipation effect of the heat generating cavity 7.

[0077] In an exemplary embodiment, the heat dissipation mechanism is a radiator, and the radiator is fixed to the air inlet duct 18, so that the radiator can dissipate heat of the heat generating cavity 7, thereby improving the heat dissipation effect of the heat generating cavity 7.

[0078] In an exemplary embodiment, the heat dissipation mechanism is a rolling rib 181, which is protruded into the air inlet duct 18 to increase the inner wall area and outer wall area of the air inlet duct 18, so as to increase the heat exchange area and further reduce the temperature of the heat generating cavity 7. At the same time, since the air speed in the air inlet duct 18 is weak, the internal airflow is mainly laminar flow (poor heat exchange effect), and the protrusion of the rolling rib 181 into the air inlet duct 18 can further disturb the airflow and strengthen the heat exchange, and the rolling rib 181 can also increase the strength of the air inlet duct 18.

[0079] In an exemplary embodiment, the fan assembly and the heat generating assembly 2 are arranged in the cover body, the heat generating assembly 2 is arranged in the shell, and the heat generating assembly 2 comprises a plurality of heat generating elements arranged in sequence along the first direction. Each heat generating element is arranged in sequence, so that in addition to the heat generated by each heat generating element, heat is also radiated to the adjacent heat generating element. According to the scheme, the air inlet end or the air outlet end of the fan assembly corresponds to each heat generating element, so that each heat generating element can have good heat dissipation, and the temperature difference between each heat generating element and other heat generating elements is reduced. Moreover, the air inlet end or the air outlet end directly corresponds to the heat generating element, and the heat dissipation effect is better than that of the heat dissipation of the cavity in which the heat generating element is arranged.

[0080] In an exemplary embodiment, the fan assembly comprises a first fan 3 and a second fan 4.

[0081] The heat generating assembly 2 is arranged in the shell 1, and comprises a first heat generating element 21, a second heat generating element 22 and a third heat generating element 23 arranged in sequence along a first direction 6 and having the same specifications. The same specifications means that the size, power and other parameters of the first heat generating element 21, the second heat generating element 22 and the third heat generating element 23 are the same.

[0082] The first fan 3 is used for heat dissipation of the heat generating assembly 2. The first fan 3 is arranged in the shell 1, and is provided with a first end 31. The first end 31 is an air inlet end or an air outlet end of the first fan 3. The first end 31 corresponds to the first heat generating element 21 and the second heat generating element 22. The area corresponding to the first heat generating element 21 is twice the area corresponding to the second heat generating element 22.

[0083] The second fan 4 is used for heat dissipation of the heat generating assembly 2. The second fan 4 is arranged in the shell 1, and is provided with a second end 41. The second end 41 is an air inlet end or an air outlet end of the second fan 4. The second end 41 corresponds to the second heat generating element 22 and the third heat generating element 23. The area corresponding to the third heat generating element 23 is twice the area corresponding to the second heat generating element 22. The area corresponding to the second heat generating element 22 is equal to the area corresponding to the second heat generating element 22. Therefore, the areas corresponding to the first heat generating element 21, the second heat generating element 22 and the third heat generating element 23 are equal, the heat dissipation areas are the same, and the temperatures of the first heat generating element 21, the second heat generating element 22 and the third heat generating element 23 are more uniform, which is convenient for use.

[0084] When the first end 31 is the air outlet end of the first fan 3 and the second end 41 is the air outlet end of the second fan 4, the heat generated by the heat generating assembly 2 will not be discharged through the first fan 3 and the second fan 4, which can increase the service life of the first fan 3 and the second fan 4.

[0085] In an exemplary embodiment, the first end 31 and the second end 41 are respectively located on both sides of the first face 5, the first face 5 is perpendicular to the first direction 6, the first heat generating member 21 and the third heat generating member 23 are equidistant from the first face 5, so that the second heat generating member 22 is affected by the first fan 3 and the second fan 4 on both sides, and the side of the first heat generating member 21 close to the second heat generating member 22 is affected by the first fan 3, and the side of the third heat generating member 23 close to the second heat generating member 22 is affected by the second fan 4, that is, even if the first heat generating member 21 and the third heat generating member 23 radiate heat to the second heat generating member 22, due to the way that the second heat generating member 22 is affected by the fans on both sides, compared with the way that the first heat generating member 21 and the third heat generating member 23 are affected by the fans on one side, the second heat generating member 22 is more evenly cooled and has a better cooling effect, so as to overcome the influence of heat radiation and further make the temperature of the first heat generating member 21, the second heat generating member 22 and the third heat generating member 23 more uniform.

[0086] In an exemplary embodiment, the first end 31 and the second end 41 are symmetrically arranged relative to the first face 5 and located in the upper region or the lower region of the heat generating assembly 2, the first end 31 and the second end 41 will not protrude to the side of the heat generating assembly 2 and will not occupy the side space, at the same time, the first end 31 and the second end 41 completely correspond to the heat generating assembly 2 and will not waste the cooling area, so that the cooling effect is better.

[0087] In an exemplary embodiment, when the heat dissipation device is used outdoors, wind and sand are easily accumulated around, and the temperature of the ground is relatively high due to sunlight, the first air outlet 112 is located at the lower end of the shell 1, which is helpful to blow away the wind and sand around, and the first air inlet 111 is located above the first air outlet 112 and is farther away from the ground, so it is not easy to suck in the wind and sand, and the temperature of the air at the upper part is relatively low, which ensures that the temperature of the first air inlet 111 is relatively low.

[0088] In an exemplary embodiment, a photovoltaic inverter includes the above-mentioned heat dissipation device, the heat generating cavity 7 is used for arranging high protection electrical components, the air inlet duct 18 is used for cooling low protection electrical components, and the shell 1 is provided with air inlets and air outlets for heat exchange, the air inlets and air outlets are isolated to prevent hot air from flowing back to the air inlets and affecting heat dissipation. The air inlets and air outlets can include the first air inlet 111 and the first air outlet 112 as described in scheme five, and can also include air inlets and air outlets with heat exchange function at other positions of the photovoltaic inverter.

[0089] In an exemplary embodiment, the air inlet and the air outlet are not located on the same wall of the housing 1, thereby preventing the hot air from flowing back.

[0090] Or the air inlet and the air outlet are located on the same wall of the housing 1, and the air inlet and the air outlet are located on the middle and lower part of the housing 1, or the upper and lower part of the housing 1, thereby preventing the hot air from flowing back by increasing the distance between the air inlet and the air outlet. When the air inlet is located on the middle or upper part of the housing 1, the temperature of the air inlet is ensured to be low, and the air sucked into the air inlet due to the temperature rise caused by sunlight on the ground is reduced.

[0091] Or the air inlet and the air outlet are located on the same wall of the housing 1, and the air inlet and the air outlet are located on the middle and lower part of the housing 1, or the upper and lower part of the housing 1, thereby preventing the hot air from flowing back by increasing the distance between the air inlet and the air outlet. When the air inlet is located on the middle or upper part of the housing 1, the temperature of the air inlet is ensured to be low, and the air sucked into the air inlet due to the temperature rise caused by sunlight on the ground is reduced.

[0092] The above description and embodiment are used to explain the protection scope of the present application, but do not constitute a limitation on the protection scope of the present application. Through the inspiration of the present application or the above embodiment, those skilled in the art can obtain the modification, equivalent replacement or other improvement of the present application embodiment or part of the technical features by combining the common knowledge, the ordinary technical knowledge in the art and / or the prior art, through logical analysis, reasoning or limited test, which should be included in the protection scope of the present application.

Claims

1. A heat dissipating device characterized by: The shell (1) is provided with an air inlet duct (18) and a heating cavity (7) outside the air inlet duct, the air inlet duct is suitable for cold air inlet, and a heat dissipation mechanism is arranged on the wall surface of the air inlet duct to dissipate heat of the heating cavity (7) through the air inlet duct. The heat dissipation mechanism is a radiator fixed to the air inlet duct (18).

2. A heat dissipating device as claimed in claim 1, characterized in that: The heat dissipation mechanism is a rolling rib, which is protruded into the air inlet duct (18) to increase the inner wall area and outer wall area of the air inlet duct (18).

3. The heat dissipating device of claim 1, wherein: Further comprising a heating assembly (2) and a fan assembly; the shell (1) further comprises a cover body in communication with the air inlet duct (18), the heating cavity (7) is located outside the cover body, the heating assembly (2) is arranged in the cover body, and the heating assembly (2) comprises a plurality of heating elements arranged in a first direction (6) in sequence; 4. The heat dissipating device of claim 1, wherein: The fan assembly is arranged in the cover body, and the air inlet end or the air outlet end of the fan assembly corresponds to each heating element, and the air inlet end of the fan assembly is in communication with the air inlet duct (18) to dissipate heat of the heating assembly (2). The heating assembly (2) comprises a first heating element (21), a second heating element (22) and a third heating element (23) arranged in the first direction (6) in sequence and having the same specification; 5. A heat dissipating device as claimed in claim 4, characterized in that: The fan assembly comprises a first fan (3) and a second fan (4), The first fan (3) is provided with a first end (31), the first end (31) is an air inlet end or an air outlet end of the first fan (3), the first end (31) corresponds to the first heating element (21) and the second heating element (22), and the area corresponding to the first heating element (21) is twice the area corresponding to the second heating element (22); The second fan (4) is provided with a second end (41), the second end (41) is an air inlet end or an air outlet end of the second fan (4), the second end (41) corresponds to the second heating element (22) and the third heating element (23), and the area corresponding to the third heating element (23) is twice the area corresponding to the second heating element (22), and the area corresponding to the second heating element (22) is equal to the area corresponding to the second heating element (22) of the first end (31). The first end (31) and the second end (41) are respectively located on two sides of a first surface (5), the first surface (5) is perpendicular to the first direction (6), and the distances from the first heating element (21) and the third heating element (23) to the first surface (5) are equal.

6. A heat dissipating device as claimed in claim 5, characterized in that: The first end (31) and the second end (41) are symmetrically arranged relative to the first surface (5) and located in an upper region or a lower region of the heating assembly (2).

7. A heat dissipating device as claimed in claim 6, characterized in that: ​ 8. A heat dissipating device as claimed in claim 5, characterized in that: The shell (1) is further provided with a first air outlet (112), the air inlet duct (18) is provided with a first air inlet (111), and the first air inlet (111) and the first air outlet (112) are used for heat dissipation air inlet and heat dissipation air outlet of the heat generating assembly (2). The first air outlet (112) is located at the lower end of the shell (1), and the first air inlet (111) is located above the first air outlet (112).

9. A photovoltaic inverter, characterized by The heat dissipation device comprises the heat dissipation device according to any one of claims 1-8; high protection electrical components are arranged in the heat generating cavity (7), the air inlet duct (18) is used for heat dissipation of low protection electrical components, and the shell (1) is provided with an air inlet and an air outlet for heat exchange, and the air inlet and the air outlet are isolated.

10. A photovoltaic inverter as claimed in claim 9, characterized in that: The air inlet and the air outlet are not located on the same wall of the shell (1); or the air inlet and the air outlet are located on the same wall of the shell (1), and the air inlet and the air outlet are located at the middle and lower parts of the shell (1) respectively, or the upper and lower parts of the shell (1); or the air inlet and the air outlet are located on the same wall of the shell (1), and the air inlet path of the air inlet and the air outlet path of the air outlet do not coincide.

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