A photovoltaic junction terminal and a photovoltaic inverter having the same

Abstract

The application provides a photovoltaic wiring terminal for connecting a circuit board of a photovoltaic inverter and an external cable joint, comprising a shell and a conductive terminal, a cavity with an inner opening and an outer opening is arranged in the shell, the conductive terminal is arranged in the cavity, one end of the conductive terminal at the inner opening is connected with the circuit board, a cylindrical section of the conductive terminal close to the outer opening is provided, and a first waterproof ring is clamped between the cylindrical section of the conductive terminal and the inner wall of the shell. The first waterproof ring of the photovoltaic wiring terminal can fill the gap between the cylindrical section of the conductive terminal and the inner wall of the shell, can effectively prevent external water vapor and pollutants from entering the inside of the photovoltaic inverter through the photovoltaic wiring terminal, has good sealing protection, greatly improves the reliability and safety of the photovoltaic inverter, and avoids damage of the photovoltaic inverter. The application provides a photovoltaic inverter.

Description

Technical Field

[0001] This utility model relates to the field of inverter technology, and in particular to a photovoltaic terminal block and a photovoltaic inverter having the same. Background Technology

[0002] Currently, photovoltaic (PV) inverters typically have PV terminals installed, and external power is connected via the mating of external cables with these terminals. However, during on-site construction or use, if the PV terminals are not connected to external cables, external moisture and contaminants can enter the PV inverter through the terminals, causing high internal humidity. This can lead to safety malfunctions in the entire PV inverter, significantly reducing reliability and safety, and in severe cases, posing a risk of explosion.

[0003] Therefore, there is an urgent need to provide a photovoltaic terminal block with good sealing and protection. Utility Model Content

[0004] The purpose of this utility model is to avoid the shortcomings of the prior art and provide a photovoltaic terminal block with good sealing and waterproof effect and a photovoltaic inverter with the same, so as to solve the above-mentioned technical problems.

[0005] In a first aspect, this application provides a photovoltaic terminal block for connecting a circuit board and an external cable connector of a photovoltaic inverter, a housing and a conductive terminal. One end of the housing is provided with an inner opening, and the other end of the housing is provided with an outer opening. A cavity is provided inside the housing to connect the inner opening and the outer opening. The conductive terminal is disposed in the cavity. One end of the conductive terminal located at the inner opening is connected to the circuit board. A section of the conductive terminal near the outer opening is cylindrical. A first waterproof ring is provided between the cylindrical section of the conductive terminal and the inner wall of the housing.

[0006] Preferably, the cylindrical segment of the conductive terminal is provided with a first annular groove, and the first waterproof ring is disposed at the first annular groove; the first waterproof ring is a double-peaked rubber strip waterproof ring or an O-ring waterproof ring.

[0007] Preferably, the first waterproof ring is a silicone rubber waterproof ring or an EPDM rubber waterproof ring.

[0008] Preferably, the conductive terminal includes a terminal block with a "U"-shaped longitudinal section, a spring with a wavy bend, a cylindrical retaining spring, and a cylindrical tubular component. The two ends of the terminal block are a free end and a fixed end, respectively. The middle part of the terminal block is a connection end located at the inner opening and connected to the circuit board. The two ends of the spring are fixedly connected to the fixed end and the retaining spring, respectively. The first annular groove is located on the outer wall of the tubular component.

[0009] Preferably, the end of the tubular component connected to the retaining spring is provided with an end cap, and the outer side of the retaining spring is provided with an undercut that faces the inner opening.

[0010] Preferably, the size of the inner opening of the housing matches the size of the connecting end.

[0011] Preferably, the tubular component is fitted with a cylindrical insert, and the inner wall of the cylindrical insert is provided with longitudinally spaced strip-shaped protrusions.

[0012] Preferably, the inner wall of the tubular component of the housing fits perfectly with the outer wall of the tubular component, and a second annular groove is provided on the outer side of the corresponding position of the retaining spring of the housing, and a second waterproof ring is provided at the second annular groove.

[0013] Preferably, a retaining ring is provided on the outer side of the housing near the inner opening, and a third waterproof ring is affixed to the side of the retaining ring near the outer opening; an external thread is provided on the outer side of the spring piece position of the housing, and the photovoltaic terminal is also provided with a first bolt, the first bolt having an internal thread that mates with the external thread, the first bolt being fitted onto the outer side of the housing from the outer opening end, the external thread being screwed into the internal thread; a threaded hole is provided at the connecting end, and a second bolt is also provided on the photovoltaic terminal that mates with the threaded hole, the second bolt being screwed into the internal thread.

[0014] Secondly, this application provides a photovoltaic inverter, including a housing and a circuit board disposed inside the housing. The housing is provided with mounting holes, and the photovoltaic inverter is also provided with photovoltaic terminals as described above, the photovoltaic terminals being inserted and fixed inside the mounting holes.

[0015] Compared with the prior art, this utility model has the following advantages: The conductive terminal of the photovoltaic terminal block of this utility model is cylindrical near the outer opening. A first waterproof ring is provided between the cylindrical section of the conductive terminal block and the inner wall of the housing. The first waterproof ring can fill the gap between the cylindrical section of the conductive terminal block and the inner wall of the housing, which can effectively prevent external moisture and pollutants from entering the photovoltaic inverter through the photovoltaic terminal block. It has good sealing and protection, which can avoid excessive humidity inside the photovoltaic inverter, ensure the safety of the entire photovoltaic inverter, greatly improve the reliability and safety of the photovoltaic inverter, and avoid damage to the photovoltaic inverter. Attached Figure Description

[0016] The present invention will be further described with reference to the accompanying drawings, but the embodiments in the drawings do not constitute any limitation on the present invention.

[0017] Figure 1 This is a schematic diagram of the structure of a first embodiment of a photovoltaic terminal block of this utility model;

[0018] Figure 2 This is a cross-sectional view of the first embodiment of a photovoltaic terminal block of this utility model;

[0019] Figure 3 yes Figure 2 A magnified structural diagram at point A;

[0020] Figure 4 This is a schematic diagram of the structure of a conductive terminal in the first embodiment of a photovoltaic wiring terminal of this utility model;

[0021] Figure 5 This is an exploded structural diagram of the conductive terminal of the first embodiment of a photovoltaic terminal block of this utility model;

[0022] Figure 6 This is a schematic diagram of the structure of a second embodiment of a photovoltaic terminal block of this utility model;

[0023] Figure 7 This is a cross-sectional view of a second embodiment of a photovoltaic terminal block of this utility model;

[0024] Figure 8 yes Figure 7 A magnified structural diagram at point B;

[0025] Figure 9 This is a schematic diagram of the structure of a conductive terminal in a second embodiment of a photovoltaic terminal block of this utility model;

[0026] Figure 10 This is an exploded structural diagram of the conductive terminal of a second embodiment of a photovoltaic terminal block of this utility model;

[0027] Figure 11 This is a schematic diagram of the cross-sectional structure of a tubular component according to a second embodiment of the photovoltaic terminal block of this utility model;

[0028] Figure 12 This is a structural schematic diagram of a photovoltaic inverter according to this utility model. Detailed Implementation

[0029] The present invention will be further described in conjunction with the following embodiments and accompanying drawings:

[0030] This application provides a photovoltaic terminal block 10, such as... Figures 1 to 12As shown, a circuit board (not shown) and an external cable connector (not shown) for connecting the photovoltaic inverter 11, a housing 12 and a conductive terminal 13 are provided. One end of the housing 12 is provided with an inner opening 14, and the other end of the housing 12 is provided with an outer opening 15. A cavity 16 is provided inside the housing 12 to connect the inner opening 14 and the outer opening 15. The conductive terminal 13 is disposed in the cavity 16. One end of the conductive terminal 13 located at the inner opening 14 is connected to the circuit board (not shown). The section of the conductive terminal 13 near the outer opening 15 is cylindrical. A first waterproof ring 17 is provided between the cylindrical section of the conductive terminal 13 and the inner wall of the housing 12.

[0031] The conductive terminal 13 of the photovoltaic terminal block 10 of this invention has a cylindrical section near the outer opening 15. A first waterproof ring 17 is fitted between the cylindrical section of the conductive terminal 13 and the inner wall of the housing 12. The first waterproof ring 17 can fill the gap between the cylindrical section of the conductive terminal 13 and the inner wall of the housing 12, effectively preventing external moisture and pollutants from entering the photovoltaic inverter 11 through the photovoltaic terminal block 10. It has good sealing and protection, which can avoid excessive humidity inside the photovoltaic inverter 11, ensure the safety of the entire photovoltaic inverter 11, greatly improve the reliability and safety of the photovoltaic inverter 11, and avoid damage to the photovoltaic inverter 11.

[0032] Better, such as Figure 3 , Figure 5 , Figure 8 and Figure 10 As shown, the cylindrical section of the conductive terminal 13 is provided with a first annular groove 18, and a first waterproof ring 17 is provided at the first annular groove 18; the first waterproof ring 17 is a double-peaked rubber strip waterproof ring or an O-ring waterproof ring.

[0033] The first waterproof ring 17 is set at the first annular groove 18, which can ensure that the first waterproof ring 17 is fixed in the first annular groove 18. During installation and use, the first waterproof ring 17 will not shift, making the waterproof structure more reliable.

[0034] The double-peaked rubber strip waterproof ring and the O-ring waterproof ring have a simple structure and a very good waterproof effect. Of course, the first waterproof ring 17 can also use other shapes of waterproof rings with existing technology.

[0035] Preferably, the first waterproof ring 17 is a silicone rubber waterproof ring or an EPDM rubber waterproof ring. Silicone rubber and EPDM rubber waterproof rings offer good waterproofing performance and are low in cost. Of course, the first waterproof ring 17 can also be made of other materials available in the prior art.

[0036] Better, such as Figure 2 , Figure 4 , Figure 5 , Figure 7 , Figure 9 and Figure 10 As shown, the conductive terminal 13 includes a terminal block 19 with a longitudinal section of "U" shape, a spring piece 20 with a wavy bend, a cylindrical retaining spring 21, and a cylindrical tubular component 22. The two ends of the terminal block 19 are a free end 23 and a fixed end 24, respectively. The middle part of the terminal block 19 is a connection end 25 located at the inner opening 14 and connected to the circuit board (not shown in the figure). The two ends of the spring piece 20 are fixedly connected to the fixed end 24 and the retaining spring 21, respectively. The first annular groove 18 is provided on the outer wall of the tubular component 22.

[0037] The terminal block 19 has a "ㄈ" shaped longitudinal section and a robust and reliable structure. The middle connection end 25 is a plate-like structure. The connection surface between the connection end 25 and the circuit board (not shown in the figure) of the photovoltaic inverter 11 is large, which facilitates the connection between the connection end 25 and the circuit board (not shown in the figure) of the photovoltaic inverter 11.

[0038] The corrugated spring 20 provides tolerance after the photovoltaic terminal 10 is connected to the external cable connector (not shown in the figure) and eliminates stress after connection. The spring 20 can be... Figure 5 and Figure 10 The wave-bending structure shown can, of course, be replaced by other stress-relief structures available in the prior art. The cylindrical retaining spring 21 facilitates connection with the cylindrical tubular component 22. The terminal block 19, spring 20, and retaining spring 21 can be designed as a single stamped part, while the tubular component 22 can be designed as a separate stamped part. The two parts are then welded together for a secure and reliable installation.

[0039] Better, such as Figure 5 and Figure 10 As shown, the end of the tubular component 22 connected to the retaining spring component 21 is provided with an end cap 26, and the outer side of the retaining spring component 21 is provided with an inverted buckle 27 with an inward opening 14.

[0040] The end cap 26 ensures that external moisture, dust, or foreign objects do not enter the photovoltaic inverter 11 when an external cable connector (not shown in the figure) is inserted inside the tubular component 22, thereby improving the sealing protection level of the photovoltaic terminal 10. Of course, the large area of ​​the end cap 26 facilitates the connection between the tubular component 22 and the retaining spring component 21.

[0041] The outer side of the snap ring 21 is provided with an inverted buckle 27 with an inward opening 14. The inverted buckle 27 can increase the friction between the conductive terminal 13 and the inner wall of the housing 12, thereby preventing loosening. It can ensure the position of the conductive terminal 13 on the inner wall of the housing 12 and prevent the conductive terminal 13 from being displaced inside the housing 12.

[0042] Better, such as Figure 2 and Figure 7As shown, the size of the inner opening 14 of the housing 12 matches the size of the connection end 25 perfectly. This prevents external moisture, dust, or pollutants from entering the photovoltaic inverter 11 through the cavity 16 of the housing 12, further improving the protection level of the photovoltaic terminal 10.

[0043] As a first embodiment of the photovoltaic terminal block 10 of this application, such as Figures 1 to 5 As shown, the tubular component 22 does not have a cylindrical insert 28. The photovoltaic terminal 10 can be set as a positive photovoltaic terminal 10 as needed to connect to the positive external cable connector.

[0044] As a second embodiment of the photovoltaic terminal block 10 of this application, such as Figures 6 to 11 As shown, a cylindrical insert 28 is fitted inside the tubular component 22, which can be configured as a negative photovoltaic terminal 10 to connect to an external negative cable connector as needed. The cylindrical insert 28 prevents incorrect connection of the positive and negative external cable connectors.

[0045] Better, such as Figure 10 and Figure 11 As shown, the inner wall of the cylindrical insert 28 is longitudinally spaced with strip-shaped protrusions 29. When the negative external cable connector is inserted into the cylindrical insert 28, the elasticity of the strip-shaped protrusions 29 can serve as a limiting force for installation and also provide good support and fixation.

[0046] As a first embodiment of the photovoltaic terminal block 10 of this application, such as Figures 1 to 5 As shown, there is a certain gap between the inner wall of the tubular component 22 at the position of the housing 12 and the outer wall of the tubular component 22, which facilitates the fit with the structure of the positive external cable connector, that is, part of the structure of the positive external cable connector can be fitted onto the outer wall of the tubular component 22.

[0047] As a second embodiment of the photovoltaic terminal block 10 of this application, such as Figures 6 to 10 As shown, the inner wall of the tubular component 22 of the housing 12 fits perfectly with the outer wall of the tubular component 22. A second annular groove 30 is provided on the outer side of the corresponding position of the retaining spring 21 of the housing 12, and a second waterproof ring 31 is provided at the second annular groove 30. Since the negative external cable connector needs to be fitted onto the outside of the housing 12 during installation, the second annular groove 30 and the second waterproof ring 31 on the outer side of the corresponding position of the retaining spring 21 of the housing 12 ensure the sealing between the negative external cable connector and the negative photovoltaic terminal 10 after the negative external cable connector is installed. This prevents external moisture, dust, or pollutants from entering the photovoltaic inverter 11 through the negative external cable connector, thereby improving the sealing protection level of the photovoltaic terminal 10.

[0048] Better, such as Figure 2 and Figure 7 As shown, a retaining ring 32 is provided on the outer side of the housing 12 near the inner opening 14, and a third waterproof ring 33 is attached to the side of the retaining ring 32 near the outer opening 15; an external thread 34 is provided on the outer side of the spring piece 20 of the housing 12, and the photovoltaic terminal 10 is also provided with a first bolt 35, which has an internal thread 36 that mates with the external thread 34. The first bolt 35 is fitted onto the outer side of the housing 12 from the outer opening 15 end, and the external thread 34 is screwed into the internal thread 36; a threaded hole 37 is provided on the connecting end 25, and a second bolt 38 that mates with the threaded hole 37 is provided on the photovoltaic terminal 10, and the second bolt 38 is screwed into the internal thread 36.

[0049] When installing the photovoltaic terminal 10 on the housing 40 of the photovoltaic inverter 11, the outer opening 15 of the photovoltaic terminal 10 can extend out of the photovoltaic inverter 11 through the mounting hole 39 of the housing 40, and the retaining ring 32 is stuck in the mounting hole 39. A third waterproof ring 33 is attached to the side of the retaining ring 32 near the outer opening 15. After the photovoltaic inverter 11 is installed, it can achieve a good sealing effect, preventing external moisture, dust or pollutants from entering the photovoltaic inverter 11 through the mounting hole 39, thereby improving the sealing protection level of the photovoltaic terminal 10.

[0050] Furthermore, such as Figure 2 and Figure 7 As shown, the first bolt 35 is fitted onto the outer shell 12 from the outer opening 15 end, and the external thread 34 is screwed into the internal thread 36. That is, the photovoltaic terminal 10 is fixed to the housing 40 of the photovoltaic inverter 11 by the first bolt 35. The structure is simple and firm and reliable.

[0051] The connection end 25 is provided with a threaded hole 37. The second bolt 38 is screwed into the internal thread 36, so that the circuit board (not shown in the figure) inside the photovoltaic inverter 11 can be connected to the connection end 25 through the second bolt 38. The structure is simple and the connection is firm and reliable.

[0052] This application also provides a photovoltaic inverter 11, such as Figures 1 to 12 As shown, the device includes a housing 40 and a circuit board (not shown) disposed inside the housing 40. The housing 40 is provided with mounting holes 39. The photovoltaic inverter 11 is also provided with photovoltaic terminals 10 as described above. The photovoltaic terminals 10 are inserted and fixed inside the mounting holes 39.

[0053] The photovoltaic inverter 11 of this invention has a cylindrical section of the conductive terminal 13 of the photovoltaic terminal 10 near the outer opening 15. A first waterproof ring 17 is fitted between the cylindrical section of the conductive terminal 13 and the inner wall of the housing 12. The first waterproof ring 17 can fill the gap between the cylindrical section of the conductive terminal 13 and the inner wall of the housing 12, effectively preventing external moisture and pollutants from entering the photovoltaic inverter 11 through the photovoltaic terminal 10. It has good sealing and protection, which can avoid excessive humidity inside the photovoltaic inverter 11, ensure the safety of the entire photovoltaic inverter 11, greatly improve the reliability and safety of the photovoltaic inverter 11, and avoid damage to the photovoltaic inverter 11.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. A photovoltaic terminal block for connecting the circuit board of a photovoltaic inverter and an external cable connector, characterized in that, include: The housing and conductive terminals are provided. One end of the housing is provided with an inner opening, and the other end of the housing is provided with an outer opening. A cavity is provided inside the housing to connect the inner opening and the outer opening. The conductive terminals are disposed in the cavity. One end of the conductive terminals located at the inner opening is connected to the circuit board. A section of the conductive terminals near the outer opening is cylindrical. A first waterproof ring is provided between the cylindrical section of the conductive terminals and the inner wall of the housing.

2. A photovoltaic terminal block according to claim 1, characterized in that: The cylindrical section of the conductive terminal is provided with a first annular groove, and the first waterproof ring is disposed at the first annular groove; the first waterproof ring is a double-peaked rubber strip waterproof ring or an O-ring waterproof ring.

3. A photovoltaic terminal block according to claim 1, characterized in that: The first waterproof ring is a silicone rubber waterproof ring or an EPDM rubber waterproof ring.

4. A photovoltaic terminal block according to claim 2, characterized in that: The conductive terminal includes a terminal block with a "U"-shaped longitudinal section, a spring with a wavy bend, a cylindrical retaining spring, and a cylindrical tubular component. The two ends of the terminal block are a free end and a fixed end, respectively. The middle part of the terminal block is a connection end located at the inner opening and connected to the circuit board. The two ends of the spring are fixedly connected to the fixed end and the retaining spring, respectively. The first annular groove is located on the outer wall of the tubular component.

5. A photovoltaic terminal block according to claim 4, characterized in that: The tubular component has an end cap at one end connected to the retaining spring component, and the retaining spring component has an overturned tab with an opening facing the inward opening on its outer side.

6. A photovoltaic terminal block according to claim 4, characterized in that: The size of the inner opening of the housing matches the size of the connecting end perfectly.

7. A photovoltaic terminal block according to claim 4, characterized in that: The tubular component is fitted with a cylindrical insert, and the inner wall of the cylindrical insert is longitudinally spaced with strip-shaped protrusions.

8. A photovoltaic terminal block according to claim 7, characterized in that: The inner wall of the tubular component of the housing fits perfectly with the outer wall of the tubular component. A second annular groove is provided on the outer side of the corresponding position of the snap ring of the housing, and a second waterproof ring is provided at the second annular groove.

9. A photovoltaic terminal block according to claim 4, characterized in that: A retaining ring is provided on the outer side of the housing near the inner opening, and a third waterproof ring is affixed to the side of the retaining ring near the outer opening; an external thread is provided on the outer side of the spring piece position of the housing, and a first bolt is also provided on the photovoltaic terminal, the first bolt having an internal thread that mates with the external thread, the first bolt being fitted onto the outer side of the housing from the outer opening end, the external thread being screwed into the internal thread; a threaded hole is provided on the connecting end, and a second bolt is also provided on the photovoltaic terminal, the second bolt being screwed into the internal thread.

10. A photovoltaic inverter, comprising a housing and a circuit board disposed within the housing, characterized in that: The housing is provided with mounting holes, and the photovoltaic inverter is further provided with a photovoltaic terminal block as described in any one of claims 1 to 9, wherein the photovoltaic terminal block is inserted and fixed in the mounting holes.

Images