External heat dissipation device of photovoltaic inverter

Abstract

This utility model discloses an external heat dissipation device for a photovoltaic inverter, including an air duct cover over a back panel and a fan bracket disposed on the back panel within a first spacer. The fan bracket has several fans with air inlets facing a first inductor box heat sink. The air duct cover has a first air inlet corresponding to the first inductor box heat sink, a second air inlet corresponding to the second inductor box heat sink, a first air outlet corresponding to the end of the heat sink facing away from the first inductor box heat sink, and a second air outlet corresponding to the end of the third inductor box heat sink facing away from the second inductor box heat sink. This utility model meets the requirement of uniform heat dissipation, balances the inverter temperature, avoids excessively high local temperatures affecting the inverter's operational stability, and extends the inverter's effective lifespan. The internal fan cover design provides protection and creates a stable airflow channel, significantly improving heat dissipation performance.

Description

Technical Field

[0001] This utility model relates to an external heat dissipation device for a photovoltaic inverter, belonging to the technical field of external heat dissipation design for photovoltaic inverters. Background Technology

[0002] An inverter is a power regulation device composed of semiconductor devices, mainly used to convert direct current (DC) power into alternating current (AC) power. It generally consists of a boost circuit and an inverter bridge circuit. The boost circuit raises the DC voltage from the solar cells to the DC voltage required for the inverter's output control; the inverter bridge circuit then converts the boosted DC voltage into an equivalent AC voltage of the commonly used frequency.

[0003] With the increasing demand for photovoltaic inverters and intensifying competition, the size of the machine has become a crucial consideration, while the requirements for its safety and stability are also rising. External heat dissipation is an extremely critical technology for photovoltaic inverters. Poor external heat dissipation will affect the inverter's ability to adapt to the external working environment, especially for high-power inverters, which need to address heat dissipation in different locations, placing even higher demands on external heat dissipation methods.

[0004] Currently, the mainstream solution for external heat dissipation of photovoltaic inverters is to set up large-area heat dissipation fins on the back panel of the inverter enclosure and achieve natural air cooling. In order to improve the heat exchange rate of the external heat sink, a fan is often set on the outside of the inverter enclosure. However, there are many heat sinks on the back panel of the inverter, and the airflow provided by the traditional fan is difficult to meet the uniformity of heat dissipation airflow to the heat sink fins, which can easily lead to local overheating. In addition, the fan is usually installed on the exposed side or side wall, which makes the heat dissipation airflow channel relatively rigid and makes it difficult to achieve balanced heat dissipation. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of the existing technology and to propose an external heat dissipation device for photovoltaic inverters, which addresses the problem of poor heat dissipation uniformity in traditional external heat dissipation devices.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] An external heat dissipation device for a photovoltaic inverter is disclosed. The photovoltaic inverter includes an inverter housing. A heat sink, a first inductor box heat sink, a second inductor box heat sink, and a third inductor box heat sink are provided on the back plate of the inverter housing. A first spacer and a second spacer are arranged perpendicularly to each other on the back plate. The heat sink and the first inductor box heat sink are respectively located on both sides of the first spacer. The first inductor box heat sink and the second inductor box heat sink are respectively located on both sides of the second spacer. The third inductor box heat sink is respectively located on both sides of the second spacer.

[0008] The external heat dissipation device includes an air duct cover covering the back plate and a fan bracket located within the first spacer on the back plate.

[0009] The fan bracket is equipped with several fans whose air intake ends face the heat sink of the first inductor box;

[0010] The outer cover of the air duct is provided with a first air inlet end that is positioned opposite to the first inductor box heat sink, a second air inlet end that is positioned opposite to the second inductor box heat sink, a first air outlet end that is positioned opposite to the end of the heat sink away from the first inductor box heat sink, and a second air outlet end that is positioned opposite to the end of the third inductor box heat sink away from the second inductor box heat sink.

[0011] Preferably, the fan frame is provided with at least one flow guide fan located within the second spacing zone.

[0012] Preferably, one end of the second spacer is provided with a guide plate opposite to the air outlet of the guide fan. The cross-section of the guide plate is V-shaped, and the opening end of the V-shaped structure faces away from the guide fan.

[0013] Preferably, the duct cover includes a duct cover back plate and an outer peripheral wall of the duct cover;

[0014] The first air inlet end includes a first back plate air inlet mesh portion disposed on the back plate of the air duct cover and a first outer peripheral wall air inlet mesh portion disposed on the outer peripheral wall of the air duct cover;

[0015] The second air inlet end includes two second air inlet mesh portions that are perpendicular to each other and are disposed on the outer peripheral wall of the air duct cover;

[0016] The first air outlet end includes a first back plate air outlet mesh portion disposed on the back plate of the air duct cover and a first outer peripheral wall air outlet mesh portion disposed on the outer peripheral wall of the air duct cover;

[0017] The second air outlet includes two second air outlet mesh portions that are perpendicular to each other and are disposed on the outer peripheral wall of the air duct cover.

[0018] Preferably, the duct cover and the fan bracket are detachably mounted on the back plate.

[0019] Preferably, the duct cover is detachably connected to the fan frame.

[0020] The beneficial effects of this utility model are mainly reflected in:

[0021] 1. The air duct meets the requirements for heat dissipation uniformity, which can balance the inverter temperature, avoid local overheating affecting the inverter's operational stability, and extend the inverter's effective lifespan.

[0022] 2. The design incorporates an internal shroud to protect the fan, while also creating a stable airflow path, significantly improving heat dissipation performance.

[0023] 3. It is simple and convenient to assemble, easy to maintain and repair, and has excellent market promotion value. Attached Figure Description

[0024] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0025] Figure 1 This is a schematic diagram of the structure of an external heat dissipation device for a photovoltaic inverter according to this utility model.

[0026] Figure 2 This is an exploded structural diagram of an external heat dissipation device for a photovoltaic inverter according to this utility model.

[0027] Figure 3 This is a schematic diagram showing the structure of the external heat dissipation device for a photovoltaic inverter, with the outer cover transparently displayed.

[0028] Figure 4 This is a schematic diagram of the airflow path of an external heat dissipation device for a photovoltaic inverter according to this utility model. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0030] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the relevant utility model and not intended to limit the utility model. Furthermore, it should be noted that, for ease of description, only the parts relevant to the utility model are shown in the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in the present application can be combined with each other.

[0031] This utility model provides an external heat dissipation device for a photovoltaic inverter, such as... Figures 1 to 4As shown, the photovoltaic inverter includes an inverter housing 100. The back plate 10 of the inverter housing 100 is provided with a heat sink 4, a first inductor box heat sink 1, a second inductor box heat sink 2, and a third inductor box heat sink 3. The back plate 10 is provided with a first spacer 101 and a second spacer 102 arranged perpendicularly to each other. The heat sink 4 and the first inductor box heat sink 1 are respectively located on both sides of the first spacer 101, the first inductor box heat sink 1 and the second inductor box heat sink 2 are respectively located on both sides of the second spacer 102, and the third inductor box heat sink 3 and the heat sink 4 are respectively located on both sides of the second spacer 102.

[0032] The external heat dissipation device includes an air duct cover 5 covering the back plate 10 and a fan bracket 6 located in the first spacer zone on the back plate 10.

[0033] The fan bracket 6 is equipped with several fans 7 with air inlets 70 facing the heat sink of the first inductor box.

[0034] The air duct cover 5 is provided with a first air inlet 51 that is aligned with the first inductor box heat sink, a second air inlet 52 that is aligned with the second inductor box heat sink, a first air outlet 53 that is aligned with the end of the heat sink that is away from the first inductor box heat sink, and a second air outlet 54 that is aligned with the end of the third inductor box heat sink that is away from the second inductor box heat sink.

[0035] Detailed implementation process and principle explanation:

[0036] An external heat dissipation device is installed on the back panel of the inverter housing 100. The back panel is equipped with a heat sink 4. The first inductor box heat sink 1, the second inductor box heat sink 2, and the third inductor box heat sink 3 are the heat dissipation parts of the corresponding inductor boxes. They are all finned heat dissipation structures to meet the requirements of efficient heat exchange.

[0037] In this plan, such as Figures 1 to 3 As shown, a fan bracket 6 is provided on the first spacing strip 101, and it has a plurality of fans 7 with air inlets 70 facing the heat sink of the first inductor box.

[0038] like Figure 2 and Figure 3 As shown, the air duct cover 5 covers the back plate 10, forming protection for the heat sink and fan inside the cover, while also meeting the requirements for air duct formation.

[0039] In the specific heat dissipation operation process, such as Figure 4 As shown, airflow is generated at the air inlet of several fans 7. External air enters from the first air inlet 51 and the second air inlet 52 to efficiently exchange heat with the first inductor heat sink and the second inductor heat sink. After passing through the fans, the air is discharged through the first air outlet 53 and the second air outlet 54 to efficiently exchange heat with the heat sink and the third inductor heat sink, thus forming a relatively balanced heat dissipation airflow path.

[0040] In one specific embodiment, the fan frame 6 is provided with at least one guide fan 71 located within the second spacing zone.

[0041] Reference Figure 4 As shown, the airflow guide fan 71 can utilize the space of the second spacing zone to achieve supplementary airflow. When the heat sink generates air resistance and the airflow guide fan 71 itself draws air, it generates an airflow path toward the second air outlet 54.

[0042] In one specific embodiment, one end of the second spacer is provided with a guide plate 8 opposite to the air outlet of the guide fan. The cross-section of the guide plate 8 is V-shaped, and the opening end of the V-shaped structure faces away from the guide fan.

[0043] The design of the air guide plate 8 enables the airflow within the second partition to be guided, thereby reducing the impact resistance and making the heat dissipation path smoother and the heat exchange and heat dissipation effect more significant.

[0044] In one specific embodiment, the duct cover 5 includes a duct cover back plate 501 and a duct cover outer peripheral wall 502.

[0045] The first air inlet end 51 includes a first back plate air inlet mesh portion 511 disposed on the back plate of the air duct cover and a first outer peripheral wall air inlet mesh portion 512 disposed on the outer peripheral wall of the air duct cover.

[0046] The second air inlet includes two mutually perpendicular second air inlet mesh portions 520 disposed on the outer peripheral wall of the air duct cover.

[0047] The first air outlet end 53 includes a first back plate air outlet mesh portion 531 disposed on the back plate of the air duct cover and a first outer peripheral wall air outlet mesh portion 532 disposed on the outer peripheral wall of the air duct cover.

[0048] The second air outlet 54 includes two second air outlet mesh portions 540 that are perpendicular to each other and are disposed on the outer peripheral wall of the air duct cover.

[0049] By designing multiple mesh sections on both the air inlet and outlet, the air volume requirements are met. At the same time, the mesh sections can also serve as a barrier to prevent organisms or debris from entering the enclosure.

[0050] In one specific embodiment, the duct cover 5 and the fan bracket 6 are detachably mounted on the back plate 10.

[0051] It is so easy to assemble, disassemble, maintain, clean, or repair.

[0052] In one specific embodiment, the duct cover 5 and the fan bracket 6 are detachably connected, which ensures the relative assembly stability of the duct cover 5, the fan bracket 6, and the back plate 10, and ensures reliable structural strength.

[0053] As can be seen from the above description, this utility model meets the requirements for uniform heat dissipation, balances the inverter temperature, avoids excessively high local temperatures affecting the inverter's operational stability, and extends the inverter's effective lifespan. The design employs an internal fan cover for protection, while simultaneously creating a stable airflow channel, significantly improving heat dissipation performance. Assembly is simple and convenient, maintenance and repair are easy, and it possesses excellent market potential.

[0054] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent in such process, method, article, or apparatus / device.

[0055] The technical solution of this utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.

Claims

1. An external heat dissipation device for a photovoltaic inverter, the photovoltaic inverter including an inverter housing, a heat sink, a first inductor box heat sink, a second inductor box heat sink, and a third inductor box heat sink provided on the back plate of the inverter housing, the back plate having a first spacer strip and a second spacer strip arranged perpendicularly to each other, the heat sink and the first inductor box heat sink being disposed on opposite sides of the first spacer strip, the first inductor box heat sink and the second inductor box heat sink being disposed on opposite sides of the second spacer strip, and the third inductor box heat sink being disposed on opposite sides of the third inductor box heat sink, characterized in that: The external heat dissipation device includes an air duct cover covering the back plate and a fan bracket located within the first spacer on the back plate. The fan bracket is equipped with several fans whose air intake ends face the heat sink of the first inductor box; The outer cover of the air duct is provided with a first air inlet end that is positioned opposite to the first inductor box heat sink, a second air inlet end that is positioned opposite to the second inductor box heat sink, a first air outlet end that is positioned opposite to the end of the heat sink away from the first inductor box heat sink, and a second air outlet end that is positioned opposite to the end of the third inductor box heat sink away from the second inductor box heat sink.

2. The external heat dissipation device for a photovoltaic inverter according to claim 1, characterized in that: The fan frame is equipped with at least one flow guide fan located within the second spacing zone.

3. The external heat dissipation device for a photovoltaic inverter according to claim 2, characterized in that: One end of the second spacer is provided with a guide plate opposite to the air outlet of the guide fan. The cross-section of the guide plate is V-shaped, and the opening end of the V-shaped structure faces away from the guide fan.

4. The external heat dissipation device for a photovoltaic inverter according to claim 1, characterized in that: The duct cover includes a duct cover back plate and an outer peripheral wall of the duct cover; The first air inlet end includes a first back plate air inlet mesh portion disposed on the back plate of the air duct cover and a first outer peripheral wall air inlet mesh portion disposed on the outer peripheral wall of the air duct cover; The second air inlet end includes two second air inlet mesh portions that are perpendicular to each other and are disposed on the outer peripheral wall of the air duct cover; The first air outlet end includes a first back plate air outlet mesh portion disposed on the back plate of the air duct cover and a first outer peripheral wall air outlet mesh portion disposed on the outer peripheral wall of the air duct cover; The second air outlet includes two second air outlet mesh portions that are perpendicular to each other and are disposed on the outer peripheral wall of the air duct cover.

5. An external heat dissipation device for a photovoltaic inverter according to any one of claims 1 to 4, characterized in that: The duct cover and the fan bracket are detachably mounted on the back plate.

6. The external heat dissipation device for a photovoltaic inverter according to claim 5, characterized in that: The duct cover is detachably connected to the fan frame.

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