A centralized photovoltaic inverter

Abstract

The utility model discloses a centralized photovoltaic inverter, including centralized photovoltaic inverter body and be used for supporting centralized photovoltaic inverter body's inverter centralized base, and inverter centralized base includes two side poles, two cross poles and the bottom plate between side pole and cross pole, and side pole and cross pole all include two outer poles and the inner pole between two outer poles, and the outside of side pole is provided with centralized base connecting structure, and centralized base connecting structure includes connecting block, sets up the plug -in block of connecting block left and right sides and the screw rod through plug -in block. The utility model discloses adjustable design adaptation different size's centralized inverter through side pole and cross pole, and the trouble of opening die customization according to machine type is saved, when many machines are in the cabinet, and adjacent base can complete rigid splicing with a connecting block, need not bridge or other additional accessories, and installation step is simplified, and manpower and time are saved significantly, and subsequent expansion only needs to add the same module, and the splicing mode is consistent.

Description

Technical Field

[0001] This utility model relates to, but is not limited to, the field of centralized photovoltaic inverter technology, and more specifically, to a centralized photovoltaic inverter. Background Technology

[0002] A centralized photovoltaic (PV) inverter is a power electronic device that connects a large number of parallel PV modules in series to the DC input of a single centralized inverter, aggregating the DC power and then converting it into AC power. In traditional solutions, the inverter capacity corresponds one-to-one with the number of combiner boxes. When multiple inverters are connected in parallel, additional cable trays, adapter plates, and numerous fasteners are required. This results in a wide variety of component specifications, cumbersome installation procedures, and a long construction period, causing inconvenience for on-site installation and future capacity expansion. Therefore, a centralized PV inverter design that facilitates inverter installation is proposed. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a centralized photovoltaic inverter.

[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution: This utility model discloses a centralized photovoltaic inverter, including a centralized photovoltaic inverter body and a centralized base for supporting the centralized photovoltaic inverter body. The centralized base includes two side rods, two cross rods, and a base plate located between the side rods and the cross rods. Each side rod and the cross rod includes two outer rods and an inner rod located between the two outer rods. A centralized base connection structure is provided on the outer side of the side rods. The centralized base connection structure includes a connecting block, inserts disposed on the left and right sides of the connecting block, and a screw passing through the inserts.

[0005] Preferably, the outer rod is sleeved on both ends of the inner rod, a limit bolt is provided between the inner rod and the outer rod, and a limit hole adapted to the limit bolt is opened on the surface of both the inner rod and the outer rod.

[0006] Preferably, a connecting plate is fixed to the outer end of the outer rod on the crossbar, and a connecting groove adapted to the connecting rod is opened on the inner side of the outer rod on the side rod, and the connecting plate is bolted to the side rod.

[0007] Preferably, the connecting block has a cross-shaped design, and the connecting plate has a slot inside that is adapted to the connecting block. The connecting block passes through the connecting slot to the outer rod and is inserted into the slot inside the connecting plate.

[0008] Preferably, the insert is fixed on the left and right sides of the connecting block, and there is a gap between the upper and lower sides of the insert and the connecting block. The gap is a slot, and an insert that matches the slot is fixed in the slot of the connecting plate.

[0009] Preferably, the insert block, the connecting plate, and the outer rod all have connecting holes that are threaded into the screw, and the connecting block and the side rod have coaxial mounting holes on their surfaces.

[0010] Preferably, a connector is provided between the bottom of the centralized inverter body and the centralized base for the inverter. The connector includes a connecting post installed at the bottom of the centralized photovoltaic inverter body and a connecting sleeve embedded in the upper surface of the centralized base for the inverter.

[0011] Preferably, the connecting sleeve is embedded in the upper surface of the crossbar or the side bar, the installation position of the connecting sleeve is offset from the connecting groove, a tensioning post is fixed inside the connecting sleeve, and an insert post that is inserted into the tensioning post is fixed inside the connecting post.

[0012] Preferably, the surface of the elastic post has several expansion joints, the elastic post is made of nylon or aluminum alloy, and the inner diameter of the elastic post under normal conditions is the same as the diameter of the insertion post.

[0013] Preferably, a triangular support block is fixed to the bottom side of the base plate, the support block is screwed to the side rod and the cross rod, and the surface of the base plate is provided with a ventilation groove for heat dissipation at the bottom of the centralized inverter body.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model adapts to centralized inverters of different sizes through the adjustable design of the side rods and cross rods, eliminating the trouble of custom molds for each model. When multiple units are connected in a cabinet, adjacent bases can be rigidly spliced ​​by sharing a single connecting block, without the need for cable trays or other additional accessories. The installation steps are simplified, saving manpower and time significantly. Subsequent expansion only requires adding the same module with a consistent splicing method, greatly improving work efficiency.

[0015] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0016] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structure of a single centralized inverter of this utility model; Figure 2 This is a cross-sectional structural diagram of the adjacent centralized inverter splicing of this utility model; Figure 3 This is an enlarged view of part A of the cross-sectional structural diagram of the adjacent centralized inverter splicing of this utility model. Figure 4 This is a cross-sectional structural diagram of the connecting block and connecting plate of this utility model; Figure 5 This is a schematic diagram of the disassembly structure of the centralized base for inverters of this utility model; Figure 6 This is an enlarged structural diagram of part B of the disassembly structure diagram of the centralized base for inverters of this utility model. Figure 7 This is a cross-sectional structural diagram of the connector of this utility model; Figure 8 This is a cross-sectional structural diagram of the base plate of this utility model; Figure 9 This is a schematic diagram of the centralized installation of the centralized photovoltaic inverter of this utility model; In the diagram: 1. Centralized inverter body; 2. Centralized base for inverter; 21. Side rod; 211. Outer rod; 212. Inner rod; 213. Limiting hole; 214. Limiting bolt; 215. Connecting groove; 22. Crossbar; 221. Connecting plate; 222. Insert plate; 23. Base plate; 231. Ventilation groove; 232. Support block; 233. Liquid cooling pipe; 3. Centralized base connection structure; 31. Connecting block; 32. Slot; 33. Insert block; 34. Screw; 35. Connecting hole; 36. Mounting hole; 4. Connector; 41. Connecting post; 42. Connecting sleeve; 43. Tightening post; 44. Insert post. Detailed Implementation

[0018] like Figure 1-9 As shown, this utility model provides a centralized photovoltaic inverter, including a centralized photovoltaic inverter body and a centralized base 2 for supporting the centralized photovoltaic inverter body. The centralized base 2 includes two side rods 21, two cross rods 22, and a base plate 23 located between the side rods 21 and the cross rods 22. Both the side rods 21 and the cross rods 22 include two outer rods 211 and an inner rod 212 located between the two outer rods 211. A centralized base connection structure 3 is provided on the outer side of the side rods 21. The centralized base connection structure 3 includes a connecting block 31, insert blocks 33 provided on the left and right sides of the connecting block 31, and a screw 34 passing through the insert block 33.

[0019] Furthermore, in this embodiment, the outer rod 211 is sleeved on both ends of the inner rod 212, and the outer rod 211 and the inner rod 212 are slidably connected to realize the adjustment of the length of the side rod 21 and the cross rod 22 to adapt to the structure of the centralized photovoltaic inverter body and improve versatility. A limit bolt 214 is provided between the inner rod 212 and the outer rod 211. The surfaces of the inner rod 212 and the outer rod 211 are provided with limit holes 213 that are adapted to the limit bolt 214. After the outer rod 211 and the inner rod 212 are adjusted, the limit bolt 214 is passed through the coaxial limit holes 213 on the inner rod 212 and the outer rod 211 at the same time to fix the outer rod 211 and the inner rod 212, thereby limiting the length of use.

[0020] It should be noted that the number of limiting holes 213 is set according to the length of the outer rod 211 and the inner rod 212.

[0021] In this embodiment, a connecting plate 221 is fixed to the outer end of the outer rod 211 on the crossbar 22. A connecting groove 215 adapted to the connecting rod is opened on the inner side of the outer rod 211 on the side rod 21. The connecting plate 221 is bolted to the side rod 21. When assembling the side rod 21 and the crossbar 22, the connecting plate 221 on the outer rod 211 of the crossbar 22 is inserted into the connecting groove 215 on the outer rod 211 of the side rod 21, and screws are inserted from the upper surface of the outer rod 211 of the side rod 21 for connection.

[0022] In this embodiment, the connecting block 31 is designed in a "+" shape. The connecting plate 221 has a slot inside that is adapted to the connecting block 31. The connecting block 31 passes through the outer rod 211 through the connecting slot 215 and is inserted into the slot inside the connecting plate 221. Through the design of the slot, the protruding parts on the left and right sides of the connecting block 31 can enter the connecting plate 221 through the end of the outer rod 211, while the middle part is placed in the connecting slot 215 of the outer rod 211.

[0023] In this embodiment, the insert block 33 is fixed on the left and right sides of the connecting block 31, and there is a gap between its upper and lower sides and the connecting block 31. The gap is the slot 32. The slot of the connecting plate 221 is fixed with an insert plate 222 that is compatible with the slot 32. The slot 32 makes the cross-section of the left and right sides of the connecting block 31 have a small gap in an "E" shape. When the connecting block 31 enters the slot of the connecting plate 221, the insert plate 222 in the slot is inserted into the slot 32, realizing the insertion of the connecting block 31 and the connecting plate 221.

[0024] In this embodiment, the insert block 33, the connecting plate 221, and the outer rod 211 all have connecting holes 35 that are threaded into the screw 34. The connecting block 31 and the side rod 21 have coaxial mounting holes 36 on their surfaces. Screws / bolts are inserted through the mounting holes 36 on the upper surface of the outer rod 211 of the side rod 21, pass through the outer rod 211, and are threaded into the connecting block 31 through the mounting holes 36 to achieve the installation of the connecting block 31.

[0025] It should be noted that, based on the shape of the connecting block 31, when adjacent inverter centralized bases 2 are centrally set up, the connecting block 31 is first inserted into the side rod 21 of one of the inverter centralized bases 2. At this time, the protruding part of the connecting block 31 is completely inserted into the side rod 21, while only half of the middle part is in the side rod 21. The other half needs to be connected to the other inverter centralized base 2 to realize the assembly of the inverter centralized base 2.

[0026] In this embodiment, a connector 4 is provided between the bottom of the centralized inverter body 1 and the centralized base 2 for inverters. The connector 4 includes a connecting post 41 installed at the bottom of the centralized photovoltaic inverter body and a connecting sleeve 42 embedded on the upper surface of the centralized base 2 for inverters. The connection between the centralized inverter body 1 and the base is achieved by the cooperation of the connecting post 41 and the sleeve.

[0027] In this embodiment, the connecting sleeve 42 is embedded on the upper surface of the crossbar 22 or the side bar 21. The installation position of the connecting sleeve 42 is offset from the connecting groove 215. The connecting sleeve 42, which is set on the upper surface of the side bar 21, is offset from the connecting groove 215 to avoid conflict with the connecting block 31 and ensure no interference during assembly and insertion / removal. The connecting sleeve 42 can also be threaded with the side bar 21 or the crossbar 22. The connecting sleeve 42 has a tensioning post 43 fixed inside, and the connecting post 41 has a plug post 44 fixed inside to be inserted into the tensioning post 43. The connection between the centralized inverter body 1 and the centralized base 2 for the inverter is achieved by the connection between the connecting post 41 and the connecting sleeve 42, and the connection between the tensioning post 43 and the plug post 44.

[0028] In this embodiment, the surface of the tensioning post 43 is provided with several expansion joints. The tensioning post 43 is made of nylon or aluminum alloy. Its specific model is based on the fact that the highest measured temperature at the bottom of the inverter is lower than the above-mentioned limit. The inner diameter of the tensioning post 43 under normal conditions is the same as the diameter of the insertion post 44. Through the expansion joints and the material, the tensioning post 43 can expand and contract. When the insertion post 44 is inserted into the tensioning post 43, the tensioning post 43 will be stretched open. However, the tensioning post 43 is located between the insertion post 44 and the connecting post 41. The connecting post 41 limits the stretching range of the tensioning post 43, so that the tensioning post 43 is tightly attached to the outer surface of the insertion post 44, which enhances the firmness of the connection between the connecting post 41 and the connecting sleeve 42. When separation is required, the centralized photovoltaic inverter can be lifted directly.

[0029] In this embodiment, a triangular support block 232 is fixed to the bottom side of the base plate 23. The support block 232 is screwed to the side rod 21 and the cross rod 22. The surface of the base plate 23 is provided with a venting groove 231 for heat dissipation at the bottom of the centralized inverter body 1. The base plate 23 is composed of several square plates. Adjacent square plates are inserted into each other and fixed by long bolts / screws. The base plate 23 has offset holes at the long bolt positions corresponding to the wiring area of ​​the liquid cooling pipe 233 to ensure that the long bolts do not contact the outer wall of the liquid cooling pipe 233 when passing through. The liquid cooling pipe 233 is installed inside the base plate 23. The liquid cooling pipe 233 is offset from the venting groove 231. The liquid cooling pipe 233 is used to cool the base plate 23, reducing the heat at the bottom of the centralized inverter. The inlet / outlet of the liquid cooling pipe 233 is respectively set on the left and right sides of the base plate 23. When assembling the square plates, the inlet / outlet of adjacent square plates are connected by pipes and sealed with rubber rings to prevent leakage.

[0030] It should be noted that the liquid cooling pipe 233 is located in the closed cavity inside the base plate 23. There is a partial air gap between the top surface of the base plate 23 and the electrical part of the inverter. Even if the coolant leaks, it cannot reach any live terminals or busbars.

[0031] Specifically, the process of centrally managing existing centralized photovoltaic inverters is as follows: S1. Select a flat, well-ventilated, and water-free ground, ensure sufficient heat dissipation space around the inverter, clear debris from the ground, and lay a moisture-proof mat or concrete foundation if necessary. S2, according to the size of the inverter body, pull the outer rod 211 to adjust the length of the side rod 21 / cross rod 22 (if the inverter is 2 meters wide, adjust the cross rod 22 to 2.2 meters with a margin), insert the limiting bolt 214 into the limiting hole 213 coaxial with the inner rod 212 and the outer rod 211, tighten the nut, insert the connecting plate 221 at the outer end of the cross rod 22 into the connecting groove 215 of the side rod 21, use bolts to tighten vertically through the connecting groove 215 from the top of the side rod 21, insert the square base plate 23 one by one, and fix it through with long bolts to ensure that the surface of the base plate 23 is flat; S21, embed the liquid cooling pipe 233 into the reserved groove of the base plate 23, offset from the venting groove 231, and fit a sealing ring at the interface of the adjacent square plate. Fix it with pipe clamps. The pipe clamps need to be inside the square plates to avoid excessive gaps between the square plates. Connect the inlet / outlet to the external circulation pump. The inlet is connected to the left side of the base plate 23, and the outlet is connected to the right side. Slowly inject coolant from the inlet until no air bubbles overflow from the outlet. Start the circulation pump. The base plate 23 is made of a metal thermally conductive material, preferably aluminum alloy or galvanized steel plate. The liquid cooling pipe 233 is a metal pipe. Fill the space between it and the reserved groove of the base plate 23 with thermally conductive adhesive or thermally conductive pads to form a continuous heat conduction path. This allows the heat at the bottom of the centralized photovoltaic inverter to be conducted through the base plate 23 to the liquid cooling pipe 233, and then carried away by the coolant. (The centralized photovoltaic inverter has its own heat dissipation. The heat dissipation structure of the base plate 23 is only used to solve the heat dissipation problem after adding a base to the bottom of the inverter.) S3, insert the cross-shaped connecting block 31 into the connecting groove 215 of the side rod 21 of the first base, with the protruding part fully entering the side rod 21. Align with the side rod 21 of the second base and push the other half of the connecting block 31 into its connecting groove 215 to ensure that the insert plate 222 is tightly connected to the slot 32. Use the screw 34 to pass through the threaded holes of the connecting block 31, the insert block 33, and the outer rod 211 in sequence and tighten them. S4. Screw the connecting sleeve 42 into the pre-drilled threaded hole on the upper surface of the side rod 21 / cross rod 22 (avoiding the position of the connecting groove 215). The top of the sleeve is flush with the surface of the rod. Install the connecting posts 41 at the four corners of the bottom of the inverter. Ensure that the insertion post 44 is vertically downward and aligned with the tensioning post 43. Use a crane or manpower to vertically place the centralized photovoltaic inverter above the base. Slowly lower it so that the connecting post 41 is inserted into the connecting sleeve 42 until the bottom surface of the centralized photovoltaic inverter is in contact with the upper surface of the base. Gently shake the inverter to confirm that there is no shaking. Use a level to check the top of the inverter. If it is tilted, place a metal shim under the base to level it. S5. Connect the installed centralized photovoltaic inverter to the combiner box that is already connected to the photovoltaic modules for use. During installation, ensure that the door of the centralized photovoltaic inverter faces outwards for easy maintenance. S6. Regularly clean the dust from the ventilation groove 231 of the base plate 23, check the joints of the liquid cooling pipe 233 for leaks, tighten all bolts, replace the tensioning column 43. When disassembly is required, first disconnect the power, wait 5 minutes for the capacitor to discharge, lift the inverter vertically upwards to disengage the connecting column 41 from the sleeve, move it to the maintenance area, remove the screw 34 and connecting block 31 in reverse order, and finally disassemble the base plate 23 and drain the coolant.

[0032] The centralized inverter, bolts, liquid cooling pipes 233, screws 34 and other components of this utility model are all general standard parts or parts known to those skilled in the art. Their structure and principle can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0033] In the description of this utility model, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "side", "top", "inner", "front", "center", "both ends", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0034] Furthermore, the terms “first,” “second,” “third,” and “fourth” are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as “first,” “second,” “third,” or “fourth” may explicitly or implicitly include at least one of those features.

[0035] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0036] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A centralized photovoltaic inverter, comprising a centralized photovoltaic inverter body and a centralized base (2) for supporting the centralized photovoltaic inverter body, characterized in that, The inverter central base (2) includes two side rods (21), two cross rods (22), and a base plate (23) located between the side rods (21) and the cross rods (22). The side rods (21) and the cross rods (22) each include two outer rods (211) and an inner rod (212) located between the two outer rods (211). A central base connection structure (3) is provided on the outer side of the side rods (21). The central base connection structure (3) includes a connecting block (31), a plug block (33) provided on the left and right sides of the connecting block (31), and a screw (34) passing through the plug block (33).

2. A centralized photovoltaic inverter according to claim 1, characterized in that, The outer rod (211) is sleeved on both ends of the inner rod (212), and a limit bolt (214) is provided between the inner rod (212) and the outer rod (211). The surfaces of the inner rod (212) and the outer rod (211) are provided with limit holes (213) that are adapted to the limit bolt (214).

3. A centralized photovoltaic inverter according to claim 2, characterized in that, A connecting plate (221) is fixed to the outer end of the outer rod (211) on the crossbar (22). A connecting groove (215) adapted to the connecting rod is opened on the inner side of the outer rod (211) on the side rod (21). The connecting plate (221) is bolted to the side rod (21).

4. A centralized photovoltaic inverter according to claim 3, characterized in that, The connecting block (31) is designed in a "+" shape. The connecting plate (221) has a slot inside that is adapted to the connecting block (31). The connecting block (31) passes through the outer rod (211) through the connecting groove (215) and is inserted into the slot inside the connecting plate (221).

5. A centralized photovoltaic inverter according to claim 4, characterized in that, The insert (33) is fixed on the left and right sides of the connecting block (31), and there is a gap between its upper and lower sides and the connecting block (31). The gap is a slot (32). The slot of the connecting plate (221) is fixed with an insert (222) that is compatible with the slot (32).

6. A centralized photovoltaic inverter according to claim 5, characterized in that, The insert (33), the connecting plate (221), and the outer rod (211) all have connecting holes (35) that are threaded into the screw (34). The connecting block (31) and the side rod (21) have coaxial mounting holes (36) on their surfaces.

7. A centralized photovoltaic inverter according to claim 6, characterized in that, A connector (4) is provided between the bottom of the centralized inverter body (1) and the centralized base (2) for inverters. The connector (4) includes a connecting post (41) installed at the bottom of the centralized photovoltaic inverter body and a connecting sleeve (42) embedded on the upper surface of the centralized base (2) for inverters.

8. A centralized photovoltaic inverter according to claim 7, characterized in that, The connecting sleeve (42) is embedded in the upper surface of the crossbar (22) or the side bar (21). The installation position of the connecting sleeve (42) is offset from that of the connecting groove (215). A tensioning post (43) is fixed inside the connecting sleeve (42). A plug post (44) that is inserted into the tensioning post (43) is fixed inside the connecting post (41).

9. A centralized photovoltaic inverter according to claim 8, characterized in that, The surface of the elastic post (43) has several expansion joints. The elastic post (43) is made of nylon or aluminum alloy. The inner diameter of the elastic post (43) under normal conditions is the same as the diameter of the insert post (44).

10. A centralized photovoltaic inverter according to claim 9, characterized in that, A triangular support block (232) is fixed on the bottom side of the base plate (23). The support block (232) is screwed to the side rod (21) and the cross rod (22). A ventilation groove (231) is provided on the surface of the base plate (23) for heat dissipation of the bottom of the centralized inverter body (1).

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