Inverter convenient for DC bus installation

Abstract

The invention discloses an inverter convenient for direct current bus installation, and relates to the technical field of power electronics, the inverter comprises a base, the top of the base is fixedly provided with a plurality of bus capacitors which are uniformly arranged and distributed in a matrix, and the top of each bus capacitor is provided with a cathode connecting column and an anode connecting column; the length of the positive electrode connecting column is larger than that of the negative electrode connecting column, a first insulating plate is arranged on the top of the bus capacitor, and a negative electrode busbar is arranged on the upper surface of the first insulating plate in an attached mode. Through the installation of the first connecting assembly and the second connecting assembly, the installation of the negative busbar (negative bus) and the positive busbar (positive bus) is quickly completed, and the problems that in the installation process of a direct current bus of an existing inverter, the positive and negative buses can be fixedly installed on a bus capacitor only by using a plurality of fasteners, and the installation is inconvenient are solved. Inconvenience is brought to the installation of the direct current bus, and the installation efficiency of the direct current bus of the inverter is reduced.

Description

Technical Field

[0001] This invention relates to the field of power electronics technology, and in particular to an inverter that is easy to install on a DC bus. Background Technology

[0002] An inverter is a converter that transforms direct current (DC) energy (from batteries or storage batteries) into constant frequency and voltage or frequency and voltage modulated alternating current (AC) (typically 220V, 50Hz sine wave). The DC bus voltage of inverters can generally reach up to DC 1000V, requiring very high insulation withstand voltage between the positive and negative busbars. The industry commonly uses epoxy boards and insulating paper to achieve electrical isolation between the positive and negative busbars, which is the traditional manufacturing method for busbars. Alternatively, a laminated busbar method, where the insulating material is integrally cast with the busbar, is also used.

[0003] For example, the existing patent publication number CN203326899U discloses a DC bus installation structure for an inverter. This invention can effectively reduce unreliable factors after the installation of the bus copper bus, such as stress and poor contact, and avoid problems such as uneven current and local overheating. It can also effectively reduce stray inductance of the bus, reduce manufacturing difficulty, and increase reliability in manufacturing, transportation, storage, and installation. It is also low in cost, easy to maintain and repair, simple to recycle, and environmentally friendly.

[0004] However, the DC bus of the inverter disclosed in the above patent requires multiple fasteners to fix the positive and negative buses onto the bus capacitor during installation, which makes the installation of the DC bus inconvenient and reduces the installation efficiency of the inverter's DC bus. Therefore, it is necessary to propose an inverter that facilitates the installation of the DC bus to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide an inverter that facilitates DC bus installation, thereby solving the problem mentioned in the background art that existing inverters require multiple fasteners to fix the positive and negative buses onto the bus capacitors during installation, which causes inconvenience to DC bus installation and reduces the installation efficiency of the inverter's DC bus.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an inverter that facilitates DC bus installation, comprising a base, wherein a plurality of bus capacitors are fixedly disposed on the top of the base in a matrix uniformly arranged, wherein a negative terminal connection post and a positive terminal connection post are disposed on the top of the bus capacitors, the length of the positive terminal connection post being greater than the length of the negative terminal connection post, a first insulating plate is disposed on the top of the bus capacitors, a negative busbar is attached to the upper surface of the first insulating plate, a second insulating plate is attached to the upper surface of the negative busbar, a positive busbar is attached to the upper surface of the second insulating plate, a first connecting component is disposed between the negative terminal connection post and the negative busbar, and a second connecting component is disposed between the positive terminal connection post and the positive busbar;

[0007] The first connecting component includes a first mounting hole through which the negative electrode connecting post moves. The first mounting hole is opened inside the negative electrode busbar. The number of the first mounting holes is the same as the number of negative electrode connecting posts. A first L-shaped elastic sheet is fixedly provided on each of the four inner walls of the first mounting hole. The first L-shaped elastic sheet is tightly fitted to the negative electrode connecting post. A first insertion hole is opened inside the negative electrode connecting post. A first connecting hole is opened inside the first L-shaped elastic sheet located in the left-right direction. The first insertion hole and the first connecting hole are interconnected. A first fixing rod is inserted between the connecting hole and the first insertion hole located in the same row. The first fixing rod is in contact with the upper surface of the negative electrode busbar.

[0008] Preferably, the second connecting assembly includes a second mounting hole through which the positive electrode connecting post moves. The second mounting hole is opened inside the positive electrode busbar. The number of the second mounting holes is the same as the number of positive electrode connecting posts. A second L-shaped elastic sheet is fixedly provided on each of the four inner walls of the second mounting hole. The second L-shaped elastic sheet is tightly fitted to the positive electrode connecting post. A second insertion hole is opened inside the positive electrode connecting post. A second connecting hole is opened inside the second L-shaped elastic sheet located in the left-right direction. The second insertion hole and the second connecting hole are interconnected. A second fixing rod is inserted between the second connecting hole and the second insertion hole located in the same row. The second fixing rod is in contact with the upper surface of the positive electrode busbar.

[0009] Preferably, the first insulating plate has a plurality of first through holes inside, the number of which is the sum of the number of negative electrode connecting posts and positive electrode connecting posts, and the negative electrode connecting posts and positive electrode connecting posts all move through the first through holes corresponding to each other.

[0010] Preferably, the negative busbar has a plurality of isolation grooves inside, the isolation grooves corresponding to the positive connection post, and the cross-sectional dimensions of the isolation grooves are larger than the cross-sectional dimensions of the positive connection post.

[0011] Preferably, the second insulating plate has a plurality of second through holes inside, the second through holes corresponding to the positive electrode connection post, and the second through holes and the first through holes have the same size.

[0012] Preferably, the top of the negative electrode connecting post protrudes from the upper surface of the negative electrode busbar.

[0013] Preferably, the top of the negative busbar is magnetically attached with four neodymium magnet blocks, and the first fixing rod is movably attached between two corresponding neodymium magnet blocks.

[0014] Preferably, the lower surface of the second insulating plate is fixedly provided with a first reserved groove, a second reserved groove and a third reserved groove, the first reserved groove, the second reserved groove and the third reserved groove are interconnected, the first reserved groove corresponds to the negative electrode connecting post, the second reserved groove corresponds to the first fixing rod, and the third reserved groove corresponds to the neodymium magnet block.

[0015] Preferably, the first reserved groove and the first mounting hole have the same size.

[0016] Preferably, it also includes an inverter body, with the base disposed inside the inverter body.

[0017] The technical effects and advantages of this invention are as follows:

[0018] 1. By installing the first and second connecting components, the installation of the negative busbar (negative bus) and the positive busbar (positive bus) can be completed quickly, solving the problem that in the existing inverter DC bus installation process, multiple fasteners are required to fix the positive and negative busbars on the bus capacitor, which brings inconvenience to the DC bus installation and reduces the installation efficiency of the inverter DC bus.

[0019] 2. By setting the first reserved slot, the second reserved slot and the third reserved slot, positions are reserved for the protrusions on the upper surface of the negative busbar, so that the second insulating plate can fit together with the negative busbar. This makes the first insulating plate, the negative busbar, the second insulating plate and the positive busbar fit together with each other, resulting in a compact structure. This avoids the entry of dust and debris, which can easily cause problems such as uneven current and local overheating, thus improving the safety and reliability of the inverter.

[0020] 3. By setting neodymium magnet blocks, the two ends of the first fixing rod are limited, which facilitates the disassembly of neodymium magnet blocks and the first fixing rod, thereby realizing the rapid disassembly of the DC bus of this inverter, making the maintenance and repair of the DC bus of the inverter simple and easy to recycle. Attached Figure Description

[0021] Figure 1 This is a first-view three-dimensional structural diagram of an inverter that facilitates DC bus installation according to the present invention.

[0022] Figure 2 This is a second-view three-dimensional structural diagram of an inverter that facilitates DC bus installation according to the present invention.

[0023] Figure 3 This is a schematic diagram of the overall disassembled structure of the present invention;

[0024] Figure 4 This is a bottom view of the second insulating plate structure of the present invention;

[0025] Figure 5 This is a schematic diagram of the bus capacitor structure of the present invention;

[0026] Figure 6 This is a schematic diagram of the negative electrode busbar structure of the present invention;

[0027] Figure 7 This is a schematic diagram of the positive electrode busbar structure of the present invention;

[0028] Figure 8 This is a schematic diagram of the structure of the first connecting component of the present invention.

[0029] In the diagram: 1. Base; 2. Busbar capacitor; 3. Negative terminal connection post; 4. Positive terminal connection post; 5. First socket; 6. Second socket; 7. First insulating plate; 8. First through hole; 9. Negative busbar; 10. Isolation groove; 11. First mounting hole; 12. Second insulating plate; 13. Second through hole; 14. Positive busbar; 15. Second mounting hole; 16. First L-shaped elastic sheet; 17. First fixing rod; 18. Neodymium magnet block; 19. First reserved groove; 20. Second reserved groove. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] This invention provides, for example Figures 1-8An inverter for easy DC bus installation is shown, comprising an inverter body (not shown in the figure), which is commercially available and belongs to the prior art, and will not be further described in this application. The inverter body has a base 1 inside, and a number of bus capacitors 2 arranged in a matrix are fixedly installed on the top of the base 1. The top of the bus capacitors 2 is provided with a negative terminal connection post 3 and a positive terminal connection post 4. The length of the positive terminal connection post 4 is greater than the length of the negative terminal connection post 3. The top of the bus capacitors 2 is provided with a first insulating plate 7. The upper surface of the first insulating plate 7 is attached to a negative busbar 9. The upper surface of the negative busbar 9 is attached to a second insulating plate 12. The upper surface of the second insulating plate 12 is attached to a positive busbar 14. Considering that the DC bus of the existing inverter requires multiple fasteners to fix the negative busbar 9 (negative busbar) and the positive busbar 14 (positive busbar) on the bus capacitors 2 during the installation process, it brings inconvenience to the DC bus installation and reduces the installation efficiency of the DC bus of the inverter.

[0032] Therefore, the present invention provides a first connecting component between the negative electrode connecting post 3 and the negative electrode busbar 9, and a second connecting component between the positive electrode connecting post 4 and the positive electrode busbar 14;

[0033] The first connecting component includes a first mounting hole 11 through which the negative electrode connecting post 3 can move. The first mounting hole 11 is opened inside the negative electrode busbar 9. The number of first mounting holes 11 is the same as the number of negative electrode connecting posts 3. A first L-shaped elastic sheet 16 is fixedly provided on each of the four inner walls of the first mounting hole 11. The first L-shaped elastic sheet 16 and the negative electrode connecting post 3 are tightly fitted together. A first insertion hole 5 is opened inside the negative electrode connecting post 3. A first connecting hole is opened inside the first L-shaped elastic sheet 16 located in the left and right direction. The first insertion hole 5 and the first connecting hole are interconnected. A first fixing rod 17 is inserted between the connecting hole and the first insertion hole 5 located in the same row. The first fixing rod 17 is in contact with the upper surface of the negative electrode busbar 9.

[0034] The second connecting component includes a second mounting hole 15 through which the positive electrode connecting post 4 can move. The second mounting hole 15 is opened inside the positive electrode busbar 14. The number of second mounting holes 15 is the same as the number of positive electrode connecting posts 4. A second L-shaped elastic sheet is fixedly installed on each of the four inner walls of the second mounting hole 15. The second L-shaped elastic sheet is in close contact with the positive electrode connecting post 4. A second insertion hole 6 is opened inside the positive electrode connecting post 4. A second connecting hole is opened inside the second L-shaped elastic sheet located in the left and right direction. The second insertion hole 6 and the second connecting hole are interconnected. A second fixing rod is inserted between the second connecting hole and the second insertion hole 6 located in the same row. The second fixing rod is in close contact with the upper surface of the positive electrode busbar 14.

[0035] Specifically, taking the first connection component as an example, the negative busbar 9 is attached to the first insulating plate 7. During the downward displacement of the negative busbar 9, the negative connecting post 3 moves through the first mounting hole 11, and the first L-shaped elastic sheet 16 is pushed open, so that the first L-shaped elastic sheet 16 is tightly attached to the negative connecting post 3, making the negative connecting post 3 and the negative busbar 9 electrically connected. Then, the first fixing rod 17 is passed between the connecting hole and the first insertion hole 5 in the same row to fix the negative busbar 9. Then, the second insulating plate 12 is attached to the negative busbar 9, and the positive busbar 14 is attached to the second insulating plate 12. Similarly, the positive busbar 14 is fixed, thereby quickly completing the installation of the DC bus. This solves the problem that in the existing inverter DC bus installation process, multiple fasteners are needed to fix the positive and negative buses to the bus capacitor 2, which brings inconvenience to the DC bus installation and reduces the installation efficiency of the inverter DC bus.

[0036] Furthermore, the first insulating plate 7 has several first through holes 8 inside. The number of first through holes 8 is the sum of the number of negative electrode connecting posts 3 and positive electrode connecting posts 4. Both negative electrode connecting posts 3 and positive electrode connecting posts 4 move through the first through holes 8 corresponding to each other.

[0037] Furthermore, the negative busbar 9 has several isolation grooves 10 inside, which correspond to the positive connection post 4. The cross-sectional dimensions of the isolation grooves 10 are larger than those of the positive connection post 4. The isolation grooves 10 ensure electrical insulation between the negative busbar 9 and the positive connection post 4.

[0038] Furthermore, the interior of the second insulating plate 12 is provided with several second through holes 13, which correspond to the positive electrode connecting post 4, and the second through holes 13 and the first through holes 8 have the same size.

[0039] Furthermore, the top of the negative electrode connecting post 3 protrudes from the upper surface of the negative electrode busbar 9, and the lower surface of the second insulating plate 12 is fixedly provided with a first reserved groove 19, a second reserved groove 20 and a third reserved groove. The first reserved groove 19, the second reserved groove 20 and the third reserved groove are interconnected. The first reserved groove 19 corresponds to the negative electrode connecting post 3, the second reserved groove 20 corresponds to the first fixing rod 17, and the third reserved groove corresponds to the neodymium magnet block 18. The first reserved groove 19 and the first mounting hole 11 have the same size.

[0040] By setting the first reserved slot 19, the second reserved slot 20 and the third reserved slot, positions are reserved for the protrusions on the upper surface of the negative busbar 9, so that the second insulating plate 12 can fit together with the negative busbar 9. This makes the first insulating plate 7, the negative busbar 9, the second insulating plate 12 and the positive busbar 14 fit together with each other, resulting in a compact structure. This avoids the entry of dust and debris, which can easily cause problems such as uneven current and local overheating, thus improving the safety and reliability of the inverter.

[0041] Furthermore, four neodymium magnet blocks 18 are magnetically attached to the top of the negative busbar 9. The first fixing rod 17 is movably attached between two corresponding neodymium magnet blocks 18. The neodymium magnet blocks 18 limit the two ends of the first fixing rod 17, thereby facilitating the disassembly of the neodymium magnet blocks 18 and the first fixing rod 17. This enables the rapid disassembly of the DC busbar of this inverter, making the maintenance and repair of the DC busbar of the inverter simple and easy to recycle.

[0042] Working Principle: During the installation of the DC bus of this inverter, the installation of the negative busbar 9 and the positive busbar 14 is quickly completed through the installation of the first and second connecting components. Specifically, taking the first connecting component as an example, the negative busbar 9 is attached to the first insulating plate 7. During the downward movement of the negative busbar 9, the negative connecting post 3 moves through the first mounting hole 11, and the first L-shaped elastic piece 16 is pushed open, so that the first L-shaped elastic piece 16 is tightly attached to the negative connecting post 3, making the negative connecting post 3 and the negative busbar 9 electrically connected. Then, the first fixing rod 17 is passed between the connecting hole and the first insertion hole 5 in the same row to fix the negative busbar 9. Finally, the second insulating plate 12 is attached to the negative busbar. Next, the positive busbar 14 is attached to the second insulating plate 12, and the positive busbar 14 is fixed in the same way, thereby quickly completing the installation of the DC bus. The isolation groove 10 ensures electrical insulation between the negative busbar 9 and the positive connecting post 4. In addition, the first reserved groove 19, the second reserved groove 20 and the third reserved groove reserve positions for the protrusions on the upper surface of the negative busbar 9, so that the second insulating plate 12 can be attached to the negative busbar 9. The first insulating plate 7, the negative busbar 9, the second insulating plate 12 and the positive busbar 14 are attached to each other, and the structure is compact, avoiding the entry of dust and debris, which can easily cause problems such as uneven current and local overheating, thus ensuring the safety and reliability of the inverter operation.

[0043] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An inverter facilitating direct current bus installation comprising a base (1), characterized in that: The top of the base (1) is fixedly provided with a plurality of bus capacitors (2) arranged in a matrix, the top of the bus capacitor (2) is provided with a negative pole connecting column (3) and a positive pole connecting column (4), the length of the positive pole connecting column (4) is greater than that of the negative pole connecting column (3), the top of the bus capacitor (2) is provided with a first insulating plate (7), the upper surface of the first insulating plate (7) is attached with a negative bus bar (9), the upper surface of the negative bus bar (9) is attached with a second insulating plate (12), the upper surface of the second insulating plate (12) is attached with a positive bus bar (14), a first connecting assembly is arranged between the negative pole connecting column (3) and the negative bus bar (9), and a second connecting assembly is arranged between the positive pole connecting column (4) and the positive bus bar (14). The first connecting assembly comprises a first mounting hole (11) through which the negative pole connecting column (3) movably passes, the first mounting hole (11) is formed in the negative bus bar (9), the number of the first mounting hole (11) is the same as that of the negative pole connecting column (3), the four inner walls of the first mounting hole (11) are fixedly provided with a first L-shaped elastic sheet (16), the first L-shaped elastic sheet (16) is closely attached to the negative pole connecting column (3), the first mounting hole (11) is provided with a first insertion hole (5) in the negative pole connecting column (3), the first L-shaped elastic sheet (16) is provided with a first connecting hole in the left-right direction, the first insertion hole (5) and the first connecting hole are in communication, and a first fixing rod (17) is inserted between the connecting holes and the first insertion hole (5) in the same row.

2. The inverter for facilitating DC bus installation of claim 1, wherein: The second connecting assembly comprises a second mounting hole (15) through which the positive pole connecting column (4) movably passes, the second mounting hole (15) is formed in the positive bus bar (14), the number of the second mounting hole (15) is the same as that of the positive pole connecting column (4), the four inner walls of the second mounting hole (15) are fixedly provided with a second L-shaped elastic sheet, the second L-shaped elastic sheet is closely attached to the positive pole connecting column (4), the second mounting hole (15) is provided with a second insertion hole (6) in the positive pole connecting column (4), the second L-shaped elastic sheet is provided with a second connecting hole in the left-right direction, the second insertion hole (6) and the second connecting hole are in communication, and a second fixing rod is inserted between the second connecting holes and the second insertion hole (6) in the same row.

3. An inverter for facilitating installation of a DC bus according to claim 2, characterized in that: The first insulating plate (7) is provided with a plurality of first through holes (8), the number of the first through holes (8) is the sum of the number of the negative pole connecting column (3) and the positive pole connecting column (4), and the negative pole connecting column (3) and the positive pole connecting column (4) movably pass through the first through holes (8) corresponding to each other.

4. An inverter for facilitating installation of a DC bus according to claim 3, characterized in that: The negative bus bar (9) is provided with a plurality of isolation grooves (10), the isolation grooves (10) correspond to the positive pole connecting column (4), and the cross-sectional dimension of the isolation groove (10) is greater than that of the positive pole connecting column (4).

5. An inverter for facilitating installation of a DC bus according to claim 4, characterized in that: The second insulating plate (12) is internally provided with a plurality of second through holes (13) corresponding to the positive electrode connecting columns (4), and the second through holes (13) have the same size as the first through holes (8).

6. An inverter for facilitating installation of a DC bus according to claim 4, characterized in that: The top of the negative electrode connecting column (3) protrudes above the upper surface of the negative electrode busbar (9).

7. An inverter for facilitating installation of a DC bus according to claim 6, characterized in that: The top of the negative electrode busbar (9) is magnetically attracted to four neodymium magnet blocks (18), and the first fixing rod (17) is movably attached between two corresponding neodymium magnet blocks (18).

8. An inverter for facilitating installation of a DC bus according to claim 7, characterized in that: The lower surface of the second insulating plate (12) is fixedly provided with a first reserved groove (19), a second reserved groove (20) and a third reserved groove, the first reserved groove (19), the second reserved groove (20) and the third reserved groove are in communication with each other, the first reserved groove (19) corresponds to the negative electrode connecting column (3), the second reserved groove (20) corresponds to the first fixing rod (17), and the third reserved groove corresponds to the neodymium magnet block (18).

9. An inverter for facilitating installation of a DC bus according to claim 8, characterized in that: The first reserved groove (19) has the same size as the first mounting hole (11).

10. The inverter for facilitating DC bus installation of claim 1, wherein: The base (1) is arranged inside the inverter body.

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