Heat dissipation structure of outdoor equipment and centralized inverter integrated machine

Abstract

The application discloses a heat dissipation structure of an outdoor device and a centralized inverter integrated machine. The copper bar connected between an inverter and a transformer is connected with an internal cavity of an alternating current side of the inverter, heat generated by the copper bar is discharged to the inverter, and the heat exchanger in the inverter is used to discharge waste heat to the external environment. The heat dissipation problem of the copper bar connected between the inverter and the transformer and the connecting cavity is solved, and the cross-sectional size of the copper bar is reduced. The temperature of the copper bar connected between the inverter and the transformer and the connecting cavity is reduced, and the service life of internal devices is prolonged.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of power transmission and transformation equipment, and particularly relates to a heat dissipation structure of an outdoor device and a centralized inverter integrated machine. BACKGROUND

[0002] With the development of 1500V outdoor inverters, the power level of centralized inverters has basically reached the top, and cannot meet the capacity demand of large square array photovoltaic power stations. Therefore, in the design of centralized inverters, most manufacturers begin to change the design concept, learn from the design idea of string inverters, adopt modular parallel mode, and design single machines of large-power centralized inverters in a modular way, so as to realize larger power levels through parallel connection of multiple machines. The modular design of inverter single machines can meet the demand of large square array photovoltaic power stations for large-power centralized inverters through the parallel connection of multiple machines.

[0003] At present, the products mainly on the domestic market are large-power centralized inverter integrated machines (inverters and transformers are placed together when leaving the factory). The centralized integrated machine includes one or multiple centralized inverter units and one matched transformer. In order to save the construction cost and material cost of the power station, the owner requires that the inverter and the transformer are placed on one base and connected by a copper bar. Although the connection of the inverter and the transformer by the copper bar saves the project construction and material cost, it brings a new problem, that is, the three-phase copper bar is placed in a closed space without heat dissipation, and the temperature of the copper bar and the cavity will continue to rise. The installed mutual inductors and cables inside will be aged more quickly in the high-temperature environment, and there is a risk of fire for a long time. Therefore, how to dissipate the waste heat in the copper bar and the cavity inside the inverter and the transformer is a new problem. At present, the heat dissipation of the copper bar and the connecting cavity of the outdoor large-power inverter integrated machine mainly has the following forms.

[0004] (1) increasing the size of the copper bar connecting the inverter and the transformer to reduce the resistance of the copper bar, thereby reducing the heat generation;

[0005] (2) increasing a fan outside the connecting cavity of the inverter and the transformer to dissipate heat by forced air cooling;

[0006] (3) increasing an elbow at the upper position of the connecting cavity of the inverter and the transformer to connect the connecting cavity with the external environment, and utilizing the "chimney effect" to dissipate heat by natural convection;

[0007] (4) increasing a small radiator on the copper bar connecting the inverter and the transformer to dissipate the heat on the copper bar.

[0008] The above and the following problems exist in the above heat dissipation modes.

[0009] (1) although the increase of the size of the copper bar can solve the heating problem of the copper bar and then reduce the internal temperature of the connecting cavity, the cost of the copper bar is relatively high, which increases the cost of the whole machine;

[0010] (2) the increase of the cooling fan at the lower part of the connecting cavity or the increase of the elbow at the upper part of the connecting cavity will make the connecting cavity communicate with the outside, so that the protection level of the whole connecting cavity cannot meet the requirements;

[0011] (3) although the increase of the small radiator on the connecting copper bar can reduce the heat of the copper bar, the heat generated by the copper bar still gathers in the connecting cavity and cannot be dissipated, so that the temperature of the whole connecting cavity will continue to rise. SUMMARY

[0012] The application provides a heat dissipation structure of an outdoor equipment and a centralized inverter integrated machine, which can dissipate heat at the connecting copper bar and the cavity inside the inverter and the transformer without increasing the cost of the copper bar.

[0013] To achieve the above purpose, the heat dissipation structure of the outdoor equipment includes a cooling fan and a connecting cavity, the connecting cavity is used for accommodating the connecting copper bar, one end of the connecting cavity is communicated with the inverter, and a heat exchanger is installed on the inverter; the cooling fan is arranged on the side of the inverter connected with the connecting cavity, and a return air hole is arranged below the cooling fan.

[0014] Further, a partition plate is arranged in the connecting cavity, the length of the partition plate is less than the length of the connecting cavity, an upper cavity is arranged above the partition plate, and a lower cavity is arranged below the partition plate, the horizontal axis of the upper cavity is in the same plane as the horizontal axis of the cooling fan, and the horizontal axis of the lower cavity is in the same plane as the horizontal axis of the return air hole.

[0015] Further, the height of the upper cavity is greater than the height of the lower cavity.

[0016] Further, the connecting copper bar is located in the upper cavity.

[0017] Further, the main part of the connecting cavity is a shell with two open ends, which includes four side plates connected in sequence, a connecting plate is arranged on the outer side of the two ends of the main part, and a threaded hole is formed in the connecting plate.

[0018] The centralized inverter integrated machine includes one or more parallel inverters, one transformer and a connecting copper bar, a heat exchanger is installed on the inverter, a connecting cavity is arranged outside the connecting copper bar, one end of the connecting copper bar is connected with the three-phase alternating current output copper bar of the inverter, and the other end is connected with the three-phase input copper bar of the transformer; the first end of the connecting cavity is communicated with the inverter, and the second end is connected with the transformer; the inner wall of the inverter connected with the connecting cavity is provided with a cooling fan, and a return air hole is arranged below the cooling fan.

[0019] Further, the heat dissipation fan has two, which are arranged at two sides of the inverter three-phase AC output copper bar respectively.

[0020] Further, the air return hole is a rectangular hole.

[0021] Further, the first end of the connecting cavity is fixedly connected with the inverter flange, and the second end is fixedly connected with the transformer flange.

[0022] Compared with the prior art, the present application has at least the following beneficial technical effects:

[0023] The present application comprises a connecting cavity, a heat dissipation fan and an air return hole, the heat generated by the copper bar is discharged into the inverter, the heat dissipation fan and the air return hole enter the heat exchanger, and the waste heat is discharged to the outside through the heat exchanger, solving the heat dissipation problem of the connecting copper bar and the connecting cavity between the inverter and the transformer, reducing the temperature of the connecting copper bar and the connecting cavity, improving the service life of the internal devices, and reducing the use of the connecting copper bar, further reducing the overall cost of the machine.

[0024] Further, a partition is arranged in the connecting cavity, so that the airflow flows along the optimal heat dissipation path, improving the heat dissipation effect.

[0025] Further, two heat dissipation fans are arranged at the lower part of the inverter, effectively sucking the airflow in the connecting cavity into the inverter, so that it enters the heat exchanger and is cooled.

[0026] In the high-power centralized inverter integrated machine, the connecting copper bar between the inverter and the transformer, the connecting cavity and the internal cavity of the inverter AC side are communicated, the heat generated by the copper bar is discharged into the inverter, and the heat exchanger inside the inverter is fully utilized to discharge the waste heat to the external environment. Not only solves the heat dissipation problem of the connecting copper bar and the connecting cavity between the inverter and the transformer, but also can reduce the cross-sectional size of the copper bar. The reduction of the temperature of the connecting copper bar and the connecting cavity between the inverter and the transformer improves the service life of the internal devices. And in the whole high-power centralized inverter integrated machine, the connecting cavity between the inverter and the transformer has no direct airflow exchange with the outside, and the protection performance is higher. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is the overall layout of the present application;

[0028] Figure 2a It is the schematic diagram of the inverter and the connecting cavity connection side of the present application;

[0029] Figure 2b It is the internal heat dissipation diagram of the inverter of the present application;

[0030] Figure 3 It is the schematic diagram of the transformer three-phase input terminal and the connecting flange of the present application;

[0031] Figure 4 This is a diagram of the copper busbar and connecting cavity for the inverter and transformer of this invention;

[0032] Figure 5 This is a diagram showing the copper busbar connecting the inverter and transformer and the heat dissipation of the cavity in this invention.

[0033] In the attached diagram: 1. Transformer, 2. Inverter, 3. Connecting cavity, 4. Connecting copper busbar, 5. Heat exchanger, 6. Cooling fan, 7. Inverter three-phase AC output copper busbar, 8. Transformer three-phase input copper busbar, 9. Inverter docking flange, 10. Transformer docking flange, 11. Return air vent, 31. Upper cavity, 32. Lower cavity, 33. Partition plate, 34. Side plate, 35. Connecting plate. Detailed Implementation

[0034] To make the objectives and technical solutions of this invention clearer and easier to understand, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. The specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention.

[0035] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0036] To overcome the heat dissipation problem of the connecting copper busbar and connecting cavity between the inverter and transformer in existing high-power centralized inverter integrated machines, this invention provides a heat dissipation solution that is simple in structure, ingenious in design, reliable in performance, good in protection, and high in heat dissipation efficiency.

[0037] The layout diagram of the high-power centralized inverter integrated machine described in this invention provides a heat dissipation structure that is simple in structure, ingenious in design, reliable in performance, good in protection, and has high heat dissipation efficiency.

[0038] Example 1

[0039] Reference Figure 1 The high-power centralized inverter integrated machine of the present invention mainly consists of one or more inverters 2 connected in parallel, a matching transformer 1, a connecting copper busbar 4 between the inverter 2 and the transformer 1, and a closed connecting cavity 3 protecting the connecting copper busbar. One end of the connecting copper busbar 4 between the inverter 2 and the transformer 2 is connected to the three-phase AC output copper busbar 7 of the inverter, and the other end is connected to the three-phase input copper busbar 8 of the transformer. The connecting cavity 3 is located between the inverter 2 and the transformer 1, with a first end connected to the transformer 1 and a second end connected to the inverter 2. The first end is fixedly connected to the inverter docking flange 9 with screws, and the second end is fixedly connected to the transformer docking flange 10 with screws. The connecting copper busbar 4 between the inverter 2 and the transformer 1 is located inside the connecting cavity 3.

[0040] Reference Figure 2a The inverter AC side is equipped with a three-phase AC output copper busbar 7 and an inverter docking flange 9 that connects to the connecting cavity 3. A cooling fan 6 is installed on each side of the three-phase AC output copper busbar 7 inside the inverter docking flange 9. The cooling fan 6 dissipates heat from the connecting copper busbar 4 and the inside of the connecting cavity 3. Two return air holes 11 are opened at the bottom of the cooling fan 6 and the three-phase AC output copper busbar 7. The inverter docking flange 9 is connected to the connecting cavity 3 by screws.

[0041] Reference Figure 2b The high-power outdoor inverter uses an external heating exchanger to dissipate heat from the internal components. Under the action of the internal circulation fan of the heat exchanger 5, the airflow circulates inside the inverter 2, transferring heat to the heat exchanger 5. The external circulation of the heat exchanger 5 then exhausts the heat to the outside of the inverter, thus achieving heat dissipation.

[0042] Figure 3 This is a schematic diagram of the three-phase input copper busbar 8 and the transformer docking flange 10 of the present invention. The three-phase input copper busbar 8 is connected to the second end of the connecting copper busbar 4, and the transformer docking flange 10 is connected to the connecting cavity 3 by screws.

[0043] Figure 4This is a schematic diagram of the connecting copper busbar 4 and connecting cavity 3 between the inverter and the transformer of the present invention. The connecting copper busbar 4 between the inverter 2 and the transformer 1 is disposed inside the connecting cavity 3, with one end connected to the three-phase AC output copper busbar 7 of the inverter and the other end connected to the three-phase input copper busbar 8 of the transformer. One end of the connecting cavity 3 is connected to the inverter docking flange 9, and the other end is connected to the transformer docking flange 10. The main body of the connecting cavity 3 is a shell with openings at both ends, including four side plates 34 connected end to end in sequence. A connecting plate 35 is provided on the outer side of both ends of the main body. The connecting plate has threaded holes for connecting with the inverter docking flange 9 or the transformer docking flange 10 by screws. A partition plate 33 is provided in the connecting cavity 3. The upper cavity 31 is above the partition plate 33, and the lower cavity 32 is below the partition plate 33. The height of the upper cavity 31 is greater than the height of the lower cavity 32. The connecting copper busbar 4 is located in the upper cavity 31. The upper cavity 31 is aligned with the inner fan of the inverter flange and the three-phase AC output copper busbar 7 of the inverter and is connected to the AC side of the inverter. The lower cavity 32 is aligned with the return air hole 11 at the bottom of the three-phase AC output copper busbar 7 of the inverter and is connected to the AC side of the inverter. The length of the partition 33 is less than the length of the connecting cavity 3, which is the airflow channel. When the cooling fan 6 is running, it can realize the airflow inside the cavity of the connecting copper busbar 4, thereby achieving the purpose of heat dissipation.

[0044] Figure 5 This invention relates to the inverter and transformer connecting copper busbar 4 and cavity heat dissipation diagram. The internal cavity of the high-power outdoor inverter uses an external heating exchange method to dissipate heat from the internal components. Under the action of the internal circulation fan of the heat exchanger 5, the airflow circulates inside the inverter, transferring heat to the heat exchanger 5. The external circulation of the heat exchanger 5 exhausts the heat to the outside of the inverter. The AC terminal of the inverter is equipped with a three-phase AC output copper busbar and an inverter docking flange 9. A cooling fan 6 is installed on the upper part of the inner side of the inverter docking flange 9, and a return air hole 11 is opened at the lower part. There is a partition 3 inside the connecting cavity 3. 3. The connecting cavity 3 is divided into upper and lower parts. The connecting copper busbar 4 is located in the upper cavity 31. The upper cavity 31 is aligned with the fan and the three-phase AC output copper busbar inside the inverter flange and is connected to the AC side of the inverter. The lower cavity 32 is aligned with the return air hole 11 at the bottom of the fan and the three-phase AC output copper busbar 7 of the inverter and is connected to the AC side of the inverter. The partition plate 33 in the middle of the connecting cavity 3 has a hole on the side near the transformer. When the fan inside the inverter flange is running, the air inside the connecting cavity 3 can flow, thereby achieving the purpose of heat dissipation for the connecting copper busbar 4 and the connecting cavity 3.

[0045] Example 2

[0046] A heat dissipation structure for an integrated inverter includes a heat exchanger 5, a cooling fan 6, and a connecting cavity 3. The integrated inverter includes one or more centralized inverters 2 and a matching transformer 1. The transformer 1 and the inverter are connected by a connecting copper busbar 4. The first end of the connecting cavity 3 is connected to the inverter 2, and the second end is connected to the transformer 1.

[0047] The main body of the connecting cavity 3 is a shell open at both ends, including four side plates connected end to end in sequence. A connecting plate is provided on the outer side of both ends of the main body, and the connecting plate has threaded holes for connection with an inverter or transformer. Two cooling fans 6 are provided at the lower part of the inverter 2, and two rectangular return air holes 11 are provided below the cooling fans 6. A partition 33 is provided in the connecting cavity 3, with an upper cavity 31 above the partition 33 and a lower cavity 32 below it. The connecting copper busbar 4 is located in the upper cavity 31. The upper cavity 31 is aligned with the cooling fan and the three-phase AC output copper busbar 7 of the inverter and is connected to the AC side of the inverter. The lower cavity 32 is aligned with the return air hole 11 at the bottom of the three-phase AC output copper busbar 7 of the inverter and is connected to the AC side of the inverter. The length of the partition 33 is less than the length of the connecting cavity 3, which is the airflow channel. When the cooling fan 6 is running, the airflow of the inverter enters the lower cavity 32 from the return air hole 11, flows to the side of the connecting cavity 3 near the transformer, and then flows to the upper cavity 31 through the channel between the partition and the side wall of the transformer. Under the action of the cooling fan, it flows from the upper cavity 31 to the heat exchanger for heat dissipation.

[0048] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A heat dissipation structure for outdoor equipment, characterized in that, The device includes a cooling fan (6) and a connecting cavity (3). The connecting cavity (3) is used to accommodate a connecting copper busbar (4). One end of the connecting cavity (3) is connected to the inverter (2). A heat exchanger (5) is installed on the inverter (2). The cooling fan (6) is located inside the inverter (2) on the side connected to the connecting cavity (3). A return air hole (11) is provided below the cooling fan (6). The connecting cavity (3) is provided with a partition (33), the length of the partition (33) is less than the length of the connecting cavity (3), the upper cavity (31) is above the partition (33), and the lower cavity (32) is below the partition (33). The upper cavity (31) is on the same plane as the horizontal axis of the cooling fan (6), and the lower cavity (32) is on the same plane as the horizontal axis of the return air hole (11). The height of the upper cavity (31) is greater than the height of the lower cavity (32); The connecting copper busbar (4) is located in the upper cavity (31).

2. The heat dissipation structure for outdoor equipment according to claim 1, characterized in that, The main body of the connecting cavity (3) is a shell with openings at both ends, including four side plates (34) connected end to end in sequence, and a ring of connecting plates (35) is provided on the outer side of both ends of the main body, with threaded holes provided on the connecting plates.

3. A centralized inverter integrated machine, characterized in that, Includes one or more inverters (2) connected in parallel, a transformer (1), and connecting copper busbars (4); a heat exchanger (5) is installed on the inverter (2); a connecting cavity (3) is provided outside the connecting copper busbar (4), one end of the connecting copper busbar (4) is connected to the three-phase AC output copper busbar (7) of the inverter, and the other end is connected to the three-phase input copper busbar (8) of the transformer; the first end of the connecting cavity (3) is connected to the inverter (2), and the second end is connected to the transformer (1); a cooling fan (6) is provided on the inner wall connecting the inverter (2) and the connecting cavity (3). A return air hole (11) is provided below the cooling fan (6); a partition (33) is provided in the connecting cavity (3), the length of the partition (33) is less than the length of the connecting cavity (3), the upper cavity (31) is above the partition (33), and the lower cavity (32) is below the partition (33). The upper cavity (31) and the horizontal axis of the cooling fan (6) are on the same plane, and the lower cavity (32) and the horizontal axis of the return air hole (11) are on the same plane; the height of the upper cavity (31) is greater than the height of the lower cavity (32); the connecting copper busbar (4) is located in the upper cavity (31).

4. A centralized inverter integrated machine according to claim 3, characterized in that, There are two cooling fans (6), which are respectively installed on both sides of the three-phase AC output copper busbar (7) of the inverter.

5. A centralized inverter integrated machine according to claim 3, characterized in that, The return air vent (11) is a rectangular vent.

6. A centralized inverter integrated machine according to claim 3, characterized in that, The first end of the connecting cavity (3) is fixedly connected to the inverter docking flange (9), and the second end is fixedly connected to the transformer docking flange (10).

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