Converter with internal circulation heat dissipation function

Abstract

The utility model discloses a converter with an internal circulation heat dissipation function, which comprises a cabinet body, and a direct-current switch, a secondary device, a phase module group, a capacitor pool and an alternating-current capacitor are arranged in an upper cavity of the cabinet body. A direct-current fuse, an alternating-current circuit breaker and a copper bar are arranged in a lower cavity of the cabinet body; a cabinet door is arranged in the middle of the front face of the cabinet body, a heat exchange unit is arranged on the cabinet door, and a heat exchange core is arranged in the heat exchange unit to achieve circulating air heat exchange cooling. An upper cavity of the cabinet body serves as an internal circulation air outlet cavity, and a lower cavity of the cabinet body serves as an internal circulation air inlet cavity; cooling air blown out of the heat exchange unit firstly flows through the upper cavity of the cabinet body and then circulates into the heat exchange unit through the lower cavity of the cabinet body. The utility model has the characteristics of compact structure, obvious heat dissipation effect, convenient maintenance and the like, and can meet the circulating ventilation requirement in the converter to the greatest extent.

Description

Technical Field

[0001] The utility model belongs to the field of converters, and in particular relates to a converter with an internal circulation heat dissipation function. Background Art

[0002] Converters, electrical devices that convert electrical power into various forms suitable for grid or user use, have been widely used in the new energy industry, such as photovoltaic inverters and energy storage converters. They are key components for converting AC to DC and vice versa. With the rapid development of the new energy industry, photovoltaic inverters and energy storage converters are being used in outdoor environments such as Gobi deserts, water surfaces, and coastal areas. These devices face harsh environments like dust, rain, and corrosive gases. The standard IP55 protection rating is no longer sufficient, placing higher demands on the converter's protection level and heat dissipation performance. However, the protection level and heat dissipation performance of the converter cabinet are mutually constrained. A higher protection level means better sealing, but greater ventilation and heat dissipation challenges. Furthermore, a higher protection level for the converter cabinet also increases overall cost. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a converter with an internal circulation heat dissipation function that has a compact structure, good heat dissipation performance, and low maintenance cost, in order to address the defect that the higher the protection level of the existing converter cabinet, the more difficult it is to dissipate heat. To achieve the above object, this utility model can adopt the following technical solutions:

[0004] A converter with an internal circulation heat dissipation function comprises a cabinet, wherein a DC switch, secondary devices, a phase module group, a capacitor pool and an AC capacitor are arranged in the upper cavity of the cabinet; a DC fuse, an AC circuit breaker and a copper busbar are arranged in the lower cavity of the cabinet; a cabinet door is provided in the middle of the front of the cabinet, and a heat exchange unit is provided on the cabinet door, and a heat exchange core is provided in the heat exchange unit to achieve circulating air heat exchange cooling; the upper cavity of the cabinet serves as an internal circulation air outlet cavity, and the lower cavity of the cabinet serves as an internal circulation air inlet cavity; the cooling air blown out by the heat exchange unit first flows through the upper cavity of the cabinet, and then circulates to the heat exchange unit through the lower cavity of the cabinet.

[0005] As a further improvement of the present invention, the heat exchange unit is mounted on the cabinet door in a wall-mounted manner and is located outside the cabinet body.

[0006] As a further improvement of the present invention, the heat exchange unit includes a first heat exchange unit and a second heat exchange unit symmetrically arranged on both sides of the front of the cabinet.

[0007] As a further improvement of the present invention, the DC switch includes a first DC switch and a second DC switch, and the first DC switch and the second DC switch are symmetrically arranged on both sides of the secondary device.

[0008] As a further improvement of the present invention, the phase module group includes a first phase module group and a second phase module group symmetrically arranged along the central axis of the cabinet, and the capacitor pool includes a second capacitor pool and a first capacitor pool symmetrically arranged along the central axis of the cabinet, the second capacitor pool is located on the inner side of the second phase module group, and the first capacitor pool is located on the inner side of the first phase module group.

[0009] As a further improvement of the present invention, the DC fuse includes a first DC fuse and a second DC fuse symmetrically arranged along the central axis of the cabinet, the first DC fuse is located below the first DC switch, and the second DC fuse is located below the second DC switch.

[0010] As a further improvement of the present invention, the AC circuit breaker includes a first AC circuit breaker and a second AC circuit breaker symmetrically arranged along the central axis of the cabinet, the first AC circuit breaker is located below the first capacitor pool, and the second AC circuit breaker is located below the second capacitor pool.

[0011] As a further improvement of the present invention, the air outlet of the first heat exchange unit is toward the first DC switch, and the air inlet of the first heat exchange unit is toward the lower cavity of the cabinet. One side of the first DC switch, one side of the second phase module group and the lower cavity of the cabinet form a first circulation air duct, and the other side of the first DC switch, one side of the AC capacitor, one side of the second capacitor pool and the lower cavity of the cabinet form a second circulation air duct.

[0012] As a further improvement of the present invention, the air outlet of the second heat exchange unit is toward the second DC switch, the air inlet of the second heat exchange unit is toward the lower cavity of the cabinet, one side of the second DC switch and the other side of the AC capacitor, one side of the first capacitor pool and the lower cavity of the cabinet form a third circulation air duct, and the other side of the second DC switch and one side of the first phase module group and the lower cavity of the cabinet form a fourth circulation air duct.

[0013] As a further improvement of the present invention, the heat exchange core adopts an air-to-air heat exchanger, a heat pipe heat exchanger, a phase change heat exchanger, or an air conditioning heat exchanger.

[0014] Compared with the prior art, the advantages of the present invention are:

[0015] 1. The converter with internal circulation heat dissipation function of the present invention is provided with a DC switch, secondary devices, phase module group, capacitor pool and AC capacitor in the upper cavity of the cabinet, a DC fuse, AC circuit breaker and copper busbar are provided in the lower cavity of the cabinet, and a heat exchange unit is provided on the cabinet door on the front of the cabinet. The heat exchange core provided in the heat exchange unit is used to realize circulating air heat exchange cooling, which has the characteristics of compact structure and easy maintenance. Furthermore, the upper cavity of the cabinet is used as the internal circulation air outlet cavity, and the lower cavity of the cabinet is used as the internal circulation air inlet cavity. The cooling air blown by the heat exchange unit first flows through the upper cavity of the cabinet, focusing on cooling and temperature-sensitive components such as the DC switch, phase module group, capacitor pool and AC capacitor, and then flows into the lower cavity of the cabinet to cool components with higher temperature tolerance such as the DC fuse, AC circuit breaker and copper busbar. Finally, it circulates to the heat exchange unit for heat exchange and is converted into cold air that is blown to the upper cavity of the cabinet, completing one air duct cycle. In this utility model, the internal circulation air duct of the inverter is completely isolated from the external environment, and the internal air can only circulate in the internal circulation cavity, thereby improving the protection level of the outdoor inverter (from IP55 to IP65), reducing customers' maintenance costs, and maintaining good heat dissipation performance of the inverter.

[0016] 2. This utility model features an internal heat dissipation converter with a wall-mounted heat exchange unit mounted on the converter cabinet door, external to the converter. This allows for flexible assembly and significantly improves the maintainability of the heat exchange unit. Furthermore, the heat exchange unit core type can be optimally configured based on the customer's on-site application environment (e.g., Gobi desert, coastal areas), offering a wide range of applications and high cost-effectiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structural principle of the converter in the specific embodiment of the present utility model;

[0018] Figure 2 This is a schematic diagram of the structural principle of the back side of the converter in a specific embodiment of the present utility model;

[0019] Figure 3 This is a schematic diagram of the principle structure of the converter upper layer viewed from above in a specific embodiment of the present utility model;

[0020] Figure 4 This is a side view of the internal circulation air duct path of the converter in a specific embodiment of the present utility model;

[0021] Figure 5 This is a top view of the internal circulation air duct path of the converter in a specific embodiment of the present utility model;

[0022] Legend: 1. First DC switch; 2. Second DC switch; 3. Secondary device; 4. First DC fuse; 5. Second DC fuse; 6. First phase module group; 7. Second phase module group; 8. Second capacitor pool; 9. First capacitor pool; 10. First AC circuit breaker; 11. Second AC circuit breaker; 12. AC capacitor; 13. AC device cavity; 14. Heat exchange unit; 141. First heat exchange unit; 142. Second heat exchange unit; 15. Heat exchange core; 100. Cabinet; 101. First circulation air duct; 102. Second circulation air duct; 103. Third circulation air duct; 104. Fourth circulation air duct DETAILED DESCRIPTION

[0023] The present invention will be further described below with reference to the accompanying drawings and specific preferred embodiments, but the scope of protection of the present invention is not limited thereby.

[0024] In the description of the present invention, it should be understood that the terms "side", "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0026] Example

[0027] like Figures 1 to 5As shown, the converter with internal circulation heat dissipation function of the present invention includes a cabinet 100, in which a DC switch, a secondary device 3, a phase module group, a capacitor pool and an AC capacitor 12 are arranged in the upper cavity of the cabinet 100; a DC fuse, an AC circuit breaker and a copper busbar are arranged in the lower cavity of the cabinet 100; a cabinet door is provided in the middle of the front of the cabinet 100, and a heat exchange unit 14 is arranged on the cabinet door, and a heat exchange core 15 is arranged in the heat exchange unit 14 to realize circulating air heat exchange cooling; the upper cavity of the cabinet 100 serves as the internal circulation air outlet cavity, and the lower cavity of the cabinet 100 serves as the internal circulation air inlet cavity; the cooling air blown out by the heat exchange unit 14 first flows through the upper cavity of the cabinet 100, and then circulates to the heat exchange unit 14 through the lower cavity of the cabinet 100. It can be understood that, combined with Figure 1 and Figure 3 As can be seen, in cabinet 100, AC capacitor 12 is installed behind secondary device 3, which is equivalent to installing secondary device 3 on a window. When the window is opened, AC capacitor 12 can be seen. Secondary devices 3 mainly include terminal blocks, fuses, relays, circuit breakers, and air switches.

[0028] In this embodiment, a DC switch, secondary components, phase module group, capacitor pool and AC capacitor are arranged in the upper cavity of the cabinet 100, a DC fuse, AC circuit breaker and copper busbar are arranged in the lower cavity of the cabinet 100, and a heat exchange unit 14 is arranged on the cabinet door on the front of the cabinet 100. The heat exchange core 15 arranged in the heat exchange unit 14 is used to achieve circulating air heat exchange cooling, which has the characteristics of compact structure and easy maintenance. Furthermore, the upper cavity of the cabinet 100 is used as the inner circulation air outlet cavity, and the lower cavity of the cabinet 100 is used as the inner circulation air inlet cavity. The cooling air blown out by the heat exchange unit 14 first flows through the upper cavity of the cabinet 100, focusing on cooling and temperature-controlled components that are more sensitive to temperature, such as DC switches, phase module groups, capacitor pools, and AC capacitors, and then flows into the lower cavity of the cabinet 100 to cool components that are resistant to higher temperatures, such as DC fuses, AC circuit breakers, and copper busbars. Finally, it is circulated into the heat exchange unit for heat exchange, and is converted into cold air that is blown to the upper cavity of the cabinet, completing an air duct cycle. In this embodiment, the inner circulation air duct of the converter is completely isolated from the external environment, and the internal air can only circulate in the inner circulation cavity, thereby improving the protection level of the outdoor converter (from IP55 to IP65), reducing the customer's maintenance costs, and maintaining good heat dissipation performance of the converter. In this embodiment, the copper busbar includes an AC busbar and a DC busbar.

[0029] like Figure 4As shown, the heat exchange unit 14 is wall-mounted on the cabinet door and located outside the cabinet 100, allowing for flexible assembly and significantly improving the maintainability of the heat exchange unit. Specifically, the main air ducts (from top to bottom, the fans, phase modules, and reactors) block the two sides of the rear face of the converter, leaving insufficient ventilation space. However, the front face of the converter offers ample installation and ventilation space, maximizing internal circulation ventilation requirements. Therefore, the heat exchange unit 14 was installed on the left and right cabinet doors on the front face of the cabinet.

[0030] like Figure 5 As shown, the heat exchange unit 14 includes a first heat exchange unit 141 and a second heat exchange unit 142 symmetrically arranged on both sides of the front of the cabinet 100 to achieve internal circulation heat dissipation from both sides of the cabinet 100.

[0031] like Figure 1 As shown, the DC switch includes a first DC switch 1 and a second DC switch 2 , and the first DC switch 1 and the second DC switch 2 are symmetrically arranged on both sides of the secondary device 3 .

[0032] like Figure 2 and Figure 3 As shown, the phase module group includes a first phase module group 6 and a second phase module group 7 symmetrically arranged along the central axis of the cabinet 100, and the capacitor pool includes a second capacitor pool 8 and a first capacitor pool 9 symmetrically arranged along the central axis of the cabinet 100. The second capacitor pool 8 is located inside the second phase module group 7, and the first capacitor pool 9 is located inside the first phase module group 6.

[0033] like Figure 1 As shown, the DC fuse includes a first DC fuse 4 and a second DC fuse 5 symmetrically arranged along the central axis of the cabinet 100 . The first DC fuse 4 is located below the first DC switch 1 , and the second DC fuse 5 is located below the second DC switch 2 .

[0034] like Figure 2 As shown, the AC circuit breaker includes a first AC circuit breaker 10 and a second AC circuit breaker 11 symmetrically arranged along the central axis of the cabinet 100. The first AC circuit breaker 10 is located below the first capacitor pool 9, and the second AC circuit breaker 11 is located below the second capacitor pool 8.

[0035] like Figure 4 and Figure 5 As shown, the air outlet of the first heat exchange unit 141 is toward the first DC switch 1, and the air inlet of the first heat exchange unit 141 is toward the lower cavity of the cabinet 100. One side of the first DC switch 1, one side of the second phase module group 7 and the lower cavity of the cabinet 100 form a first circulation air duct 101, and the other side of the first DC switch 1, one side of the AC capacitor 12, one side of the second capacitor pool 8 and the lower cavity of the cabinet 100 form a second circulation air duct 102.

[0036] Specifically, the outlet air (cold air) of the first heat exchange unit 141 blows toward the first DC switch 1, and then is divided into two branches, namely the first circulation duct 101 and the second circulation duct 102. The cold air of the left branch blows toward the second phase module group 7 to cool the inner circulation cavity of the second phase module group 7, and then blows toward the AC device cavity 13 in the lower layer of the cabinet 100 to cool the AC circuit breaker installed in the AC device cavity 13 and some accompanying AC side secondary devices. The cold air of the right branch blows toward the AC capacitor 12 and the second capacitor pool 8, and then blows toward the second AC circuit breaker 11 in the lower cavity of the cabinet 100. The cooling air blown toward the lower cavity of the cabinet 100 simultaneously cools the AC copper busbar, DC copper busbar and the first DC fuse 4 to become hot air, which is sucked into the air inlet by the first heat exchange unit 141. After the hot air exchanges heat with the external circulating air through the heat exchanger core 15, it becomes cold air again and blows toward the DC switch cavity, completing one air duct cycle.

[0037] like Figure 5 As shown, the air outlet of the second heat exchange unit 142 is toward the second DC switch 2, and the air inlet of the second heat exchange unit 142 is toward the lower cavity of the cabinet 100. One side of the second DC switch 2 and the other side of the AC capacitor 12, one side of the first capacitor pool 9 and the lower cavity of the cabinet 100 form a third circulation air duct 103, and the other side of the second DC switch 2 and one side of the first phase module group 6 and the lower cavity of the cabinet 100 form a fourth circulation air duct 104.

[0038] In this embodiment, the heat exchange core 15 adopts an air-to-air heat exchanger to realize the internal circulation heat dissipation of the cabinet 100. In other embodiments, the heat exchange core 15 can also adopt a heat pipe heat exchanger, a phase change heat exchanger, or an air conditioning heat exchanger. For example, when using an external wall-mounted air conditioning heat exchanger, active temperature control can be achieved according to the actual temperature inside the converter. Its temperature control effect and efficiency are better than using an air-to-air heat exchanger. It can be flexibly selected and matched according to the objective needs of the converter and the actual application environment. The corresponding internal circulation air duct path is not limited to Figure 4 and Figure 5 As shown, it can be adjusted according to the placement of key components, tolerance temperature and actual temperature rise.

[0039] Although the present invention is disclosed above with reference to preferred embodiments, this is not intended to limit the present invention. Any person skilled in the art can, without departing from the spirit and technical solution of the present invention, utilize the methods and technical content disclosed above to make many possible changes and modifications to the technical solution of the present invention, or modify it into an equivalent embodiment with equivalent changes. Therefore, any simple modification, equivalent replacement, equivalent change, and modification of the above embodiments made in accordance with the technical spirit of the present invention, without departing from the content of the technical solution of the present invention, shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A converter with internal circulation heat dissipation function, characterized in that: The invention comprises a cabinet (100), wherein a DC switch, a secondary device (3), a phase module group, a capacitor pool and an AC capacitor (12) are arranged in the upper cavity of the cabinet (100); a DC fuse, an AC circuit breaker and a copper busbar are arranged in the lower cavity of the cabinet (100); a cabinet door is provided in the middle of the front of the cabinet (100), a heat exchange unit (14) is provided on the cabinet door, and a heat exchange core (15) is provided in the heat exchange unit (14) to achieve circulating air heat exchange cooling; the upper cavity of the cabinet (100) serves as an inner circulation air outlet cavity, and the lower cavity of the cabinet (100) serves as an inner circulation air inlet cavity; the cooling air blown out by the heat exchange unit (14) first flows through the upper cavity of the cabinet (100), and then circulates to the heat exchange unit (14) through the lower cavity of the cabinet (100).

2. The converter with internal circulation heat dissipation function according to claim 1, characterized in that: The heat exchange unit (14) is mounted on the cabinet door in a wall-mounted manner and is located outside the cabinet body (100).

3. The converter with internal circulation heat dissipation function according to claim 2, characterized in that: The heat exchange unit (14) comprises a first heat exchange unit (141) and a second heat exchange unit (142) symmetrically arranged on both sides of the front of the cabinet (100).

4. The converter with internal circulation heat dissipation function according to claim 3, characterized in that: The DC switch comprises a first DC switch (1) and a second DC switch (2), wherein the first DC switch (1) and the second DC switch (2) are symmetrically arranged on both sides of the secondary device (3).

5. The converter with internal circulation heat dissipation function according to claim 4, characterized in that: The phase module group comprises a first phase module group (6) and a second phase module group (7) symmetrically arranged along the central axis of the cabinet (100); the capacitor pool comprises a second capacitor pool (8) and a first capacitor pool (9) symmetrically arranged along the central axis of the cabinet (100); the second capacitor pool (8) is located inside the second phase module group (7), and the first capacitor pool (9) is located inside the first phase module group (6).

6. The converter with internal circulation heat dissipation function according to claim 5, characterized in that: The DC fuse comprises a first DC fuse (4) and a second DC fuse (5) symmetrically arranged along the central axis of the cabinet (100); the first DC fuse (4) is located below the first DC switch (1); and the second DC fuse (5) is located below the second DC switch (2).

7. The converter with internal circulation heat dissipation function according to claim 6, characterized in that: The AC circuit breaker comprises a first AC circuit breaker (10) and a second AC circuit breaker (11) symmetrically arranged along the central axis of the cabinet (100); the first AC circuit breaker (10) is located below the first capacitor pool (9); and the second AC circuit breaker (11) is located below the second capacitor pool (8).

8. The converter with internal circulation heat dissipation function according to claim 7, characterized in that: The air outlet of the first heat exchange unit (141) faces the first DC switch (1), and the air inlet of the first heat exchange unit (141) faces the lower cavity of the cabinet (100); one side of the first DC switch (1), one side of the second phase module group (7), and the lower cavity of the cabinet (100) form a first circulation air duct (101); the other side of the first DC switch (1), one side of the AC capacitor (12), one side of the second capacitor pool (8), and the lower cavity of the cabinet (100) form a second circulation air duct (102).

9. The converter with internal circulation heat dissipation function according to claim 7, characterized in that: The air outlet of the second heat exchange unit (142) faces the second DC switch (2), and the air inlet of the second heat exchange unit (142) faces the lower cavity of the cabinet (100); one side of the second DC switch (2), the other side of the AC capacitor (12), one side of the first capacitor pool (9), and the lower cavity of the cabinet (100) form a third circulation air duct (103); the other side of the second DC switch (2), one side of the first phase module group (6), and the lower cavity of the cabinet (100) form a fourth circulation air duct (104).

10. The converter with internal circulation heat dissipation function according to any one of claims 1 to 9, characterized in that: The heat exchange core (15) is an air-to-air heat exchanger, a heat pipe heat exchanger, a phase change heat exchanger, or an air conditioning heat exchanger.

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