Anti-loose connection terminal of busbar of photovoltaic combiner box

Abstract

The present application relates to the technical field of photovoltaic combiner box, in particular to a kind of anti-loosening wiring terminal of busbar of photovoltaic combiner box, including busbar, U-shaped porcelain plate, "T"-shaped insulating rod, "J"-shaped lock catch, pressing plate and non-return assembly, by the optimization of traditional "bolt type" tightening wiring terminal into "latch type" clamping structure, and simultaneously to the axial and radial of "latch" synchronous limit, both can guarantee the stability of line connection, improve the stability of current input, also can avoid the relative slide between line and busbar and cause abrasion, to affect the contact resistance between the two, cooperate with the use of "ventilation and heat dissipation" structure, prolong the service life of entire photovoltaic combiner box, guarantee the smoothness of confluence.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic combiner box technology, specifically to a combiner bus anti-loosening terminal for a photovoltaic combiner box. Background Technology

[0002] A photovoltaic combiner box is an important device used to combine the DC current from multiple photovoltaic strings and transmit it to the inverter. It is a key electrical node in a photovoltaic power generation system. The photovoltaic combiner box not only reduces the number of connecting lines between the multiple photovoltaic strings and the inverter, simplifying the wiring, but also improves the convenience of subsequent maintenance.

[0003] Currently, existing photovoltaic combiner boxes are exposed to the outdoors for extended periods. When connecting the terminals at the combiner bus, they are mostly fixed manually by tightening bolts, resulting in poor consistency. Under long-term wind vibration and thermal expansion and contraction, the terminals are prone to loosening or even falling off completely. Falling off will cause abnormal interruption of current transmission, while loosening will directly cause poor contact between the terminals and the combiner bus, leading to increased contact resistance, abnormal local temperature rise, and potentially causing melting or fire. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a busbar anti-loosening terminal for a photovoltaic combiner box. By optimizing the traditional "bolt-type" tightening terminal into a "pin-type" snap-fit ​​structure, and simultaneously limiting the axial and radial directions of the "pin," it can ensure the stability of the line connection, improve the stability of the current input, and prevent relative slippage between the line and the busbar, which would cause wear and affect the contact resistance between them. Combined with the use of a "ventilation and heat dissipation" structure, it extends the service life of the entire photovoltaic combiner box and ensures smooth current collection.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: a busbar anti-loosening terminal for a photovoltaic combiner box, including a busbar, the busbar is fixedly installed inside the combiner box body, the busbar is evenly provided with wiring through holes, the busbar is horizontally placed through a C-shaped ceramic plate, the C-shaped ceramic plate is fixedly connected to the inner wall of the combiner box body, a T-shaped insulating rod is slidably arranged on the C-shaped ceramic plate perpendicular to the direction of the busbar, the T-shaped insulating rod passes through the wiring through hole, a J-shaped latch is symmetrically installed at the end of the T-shaped insulating rod, a pressure plate is fixedly installed on the T-shaped insulating rod at a position away from the J-shaped latch and close to the busbar, the pressure plate abuts against the end face of the busbar, a check component is snapped into the side of the J-shaped latch, and the check component is fixedly connected to the side of the C-shaped ceramic plate.

[0006] Specifically, the busbar is made of copper and silver-plated to reduce contact resistance. The insertion direction is marked on its surface near the wiring through hole and is coated with a fluorescent coating to facilitate operation at night or in low-light environments.

[0007] Specifically, the inner diameter of the wiring through hole is 16-20mm, and the distance between the opposite ends of the two "J" shaped latches is 12-20mm.

[0008] Specifically, insulating partitions are uniformly installed on the inner side of the C-shaped ceramic plate, and heat dissipation channels are formed between multiple insulating partitions. Heat dissipation fins are uniformly arranged on the side wall of the insulating partitions.

[0009] Specifically, the heat dissipation fins are made of alloy materials, specifically aluminum alloy, copper alloy, or copper-aluminum alloy, and the included angle between the heat dissipation fins and the insulating partition is 45°-90°.

[0010] Specifically, a built-in spring clip is fixedly installed on the opposite sidewalls of the two adjacent insulating partitions at the position corresponding to the "T"-shaped insulating rod.

[0011] Specifically, the inverted ceramic plate has symmetrical heat dissipation vents at both ends, and an "L"-shaped plate is hinged to the heat dissipation vents by a torsion spring. Arc-shaped memory metal plates are symmetrically fixed on the inner walls of both sides of the inverted ceramic plate, and the ends of the arc-shaped memory metal plates are in contact with the corners of the "L"-shaped plates.

[0012] Specifically, an arc-shaped handle is fixedly installed on the end of the "T"-shaped insulating rod away from the "J"-shaped latch, a limit plate is fixedly installed on the "T"-shaped insulating rod near the arc-shaped handle, and a helical spring is sleeved on the "T"-shaped insulating rod between the limit plate and the C-shaped ceramic plate.

[0013] Specifically, the “T”-shaped insulating rod has a concave groove at the position corresponding to the built-in spring clip, and a limit groove is provided on the side wall of the “T”-shaped insulating rod between two adjacent concave grooves.

[0014] Specifically, the pressure plate is made of ceramic fiber felt material with compressive deformation capability.

[0015] Specifically, the check valve assembly includes a crossbar, a check valve seat, a check valve latch, and a check valve ball. A crossbar is fixedly installed on the inner wall of the U-shaped ceramic plate near the busbar. A check valve seat is fixedly installed on the crossbar at the position corresponding to the wiring through hole. Check valve latches are symmetrically installed on the check valve seat. The end of the check valve latch away from the check valve seat has an arc-shaped structure and extends to the inside of the "J"-shaped latch. A check valve ball is fixedly installed at the position of the check valve latch inside the "J"-shaped latch.

[0016] Specifically, the check lock is made of aluminum oxide or aluminum nitride, and the rotating arc-shaped part of the check lock abuts against the surface of the busbar.

[0017] The beneficial effects of this invention are:

[0018] 1. The traditional "bolt-type" tightening terminal block is optimized into a "pin-type" snap-fit ​​structure. The axial movement of the "pin" is limited by the cooperation of the spring clip and the concave groove, and the radial movement of the "pin" is limited by the cooperation of the "J"-shaped latch and the check valve assembly. Both of these, together with the pressure plate, can ensure the stability of the line connection and improve the stability of the current input, while avoiding relative slippage between the line and the busbar that would cause wear and reduce the contact resistance between them.

[0019] 2. Multiple insulating partitions are designed inside the C-shaped ceramic plate to form a self-generating heat dissipation channel. Combined with the use of heat dissipation fins and the characteristics of the arc-shaped memory metal plate, the temperature of the surrounding environment of the busbar can be quickly reduced, avoiding the problem of local temperature abnormalities. At the same time, it solves the problem of easy melting and fire caused by high temperature, extends the service life of the entire photovoltaic combiner box, and ensures the smoothness of current collection. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0022] Figure 2 This is a three-dimensional structural diagram of the junction box body after the cover of the present invention has been opened;

[0023] Figure 3 This is a schematic diagram of the three-dimensional connection structure between the busbar, DC input module, circuit breaker, shaped ceramic plate and "T" shaped insulating rod in this invention;

[0024] Figure 4 This is a three-dimensional structural diagram of the present invention after removing the combiner box, DC input module, photovoltaic self-powered module, circuit breaker and detection module;

[0025] Figure 5 In this invention Figure 4 A cross-sectional three-dimensional structural diagram;

[0026] Figure 6 In this invention Figure 5 A magnified structural diagram at point A;

[0027] Figure 7 In this invention Figure 5 Another perspective of the three-dimensional structure diagram;

[0028] Figure 8 In this invention Figure 7 A magnified structural diagram at point B.

[0029] In the picture:

[0030] 1. Busbar housing; 11. Busbar; 111. Wiring through hole; 12. DC input module; 13. Photovoltaic self-powered module; 14. Circuit breaker; 15. Detection module;

[0031] 2. C-shaped ceramic plate; 21. Insulating partition; 22. Heat dissipation fins; 23. Spring lever; 24. "L" shaped plate; 25. Arc-shaped memory metal plate;

[0032] 3. "T"-shaped insulating rod; 31. Arc-shaped handle; 32. Limiting plate; 33. Helical spring; 34. Concave groove; 35. Limiting slide groove;

[0033] 4. J-shaped latch; 5. Pressure plate;

[0034] 6. Check valve assembly; 61. Crossbar; 62. Check valve seat; 63. Check valve latch; 64. Check valve ball. Detailed Implementation

[0035] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0036] Example 1:

[0037] See Figures 1 to 5 A photovoltaic combiner box includes a busbar anti-loosening terminal block, comprising a busbar 11, which is fixedly installed inside the combiner box body 1. The busbar 11 has evenly spaced wiring through holes 111. The busbar 11 is horizontally inserted through a C-shaped ceramic plate 2, which is fixedly connected to the inner wall of the combiner box body 1. A T-shaped insulating rod 3 is slidably installed on the C-shaped ceramic plate 2 in a direction perpendicular to the busbar 11. The T-shaped insulating rod 3 passes through the wiring through hole 111. A pressure plate 5 is fixedly installed on the T-shaped insulating rod 3 at a position away from the J-shaped locking buckle 4 and close to the busbar 11. The pressure plate 5 abuts against the end face of the busbar 11. The pressure plate 5 is made of ceramic fiber felt material with compression deformation capability.

[0038] The busbar box 1 is also equipped with a DC input module 12, a photovoltaic self-powered module 13, a circuit breaker 14, and a detection module 15. The DC input module 12 is located on the side of the busbar 11 and is electrically connected to the busbar 11. The DC input module 12 is connected to an output wire. The photovoltaic self-powered module 13 is located on the side of the DC input module 12. The detection module 15 is located on the side of the photovoltaic self-powered module 13 and is electrically connected to the photovoltaic self-powered module 13. The circuit breaker 14 is installed on the other side of the busbar 11. The incoming lines of the multiple photovoltaic strings are first connected to the circuit breaker 14 and then connected to the busbar 11.

[0039] The busbar 11 is made of copper and has a silver-plated surface to reduce contact resistance. The insertion direction is marked on its surface near the wiring through hole 111 and is coated with a fluorescent coating to facilitate operation at night or in low-light environments.

[0040] The inner diameter of the wiring through hole 111 is 16-20mm, and the distance between the back ends of the two "J" shaped latches 4 is 12-20mm.

[0041] The inner side of the inverted ceramic plate 2 is uniformly equipped with insulating partitions 21, and heat dissipation channels are formed between multiple insulating partitions 21. Heat dissipation fins 22 are uniformly arranged on the side wall of the insulating partitions 21.

[0042] The heat dissipation fins 22 are made of alloy materials, specifically aluminum alloy, copper alloy or copper-aluminum alloy, and the included angle between the heat dissipation fins 22 and the insulating partition 21 is 45°-90°.

[0043] Built-in spring clips 23 are fixedly installed on the opposite side walls of the two adjacent insulating partitions 21 and at the positions corresponding to the “T”-shaped insulating rods 3.

[0044] The inverted ceramic plate 2 has symmetrical heat dissipation vents at both ends. An "L"-shaped plate 24 is hinged to the heat dissipation vents by a torsion spring. An arc-shaped memory metal plate 25 is symmetrically fixed on the inner walls of both sides of the inverted ceramic plate 2. The end of the arc-shaped memory metal plate 25 contacts the corner of the "L"-shaped plate 24.

[0045] An arc-shaped handle 31 is fixedly installed on the end of the "T"-shaped insulating rod 3 away from the "J"-shaped latch 4. A limiting plate 32 is fixedly installed on the "T"-shaped insulating rod 3 near the arc-shaped handle 31. A helical spring 33 is sleeved on the "T"-shaped insulating rod 3 between the limiting plate 32 and the C-shaped ceramic plate 2.

[0046] The “T”-shaped insulating rod 3 has a concave groove 34 at the position corresponding to the built-in spring clip 23, and a limit groove 35 is provided on the side wall of the “T”-shaped insulating rod 3 between two adjacent concave grooves 34.

[0047] In this embodiment, it is also emphasized that when the incoming current line is not connected to the "T"-shaped insulating rod 3 corresponding to the pressure plate 5, the pressure plate 5 will abut against the surface of the busbar 11. At this time, the pressure plate 5 can play a role in preventing dust in the contact area. When the incoming current line is connected, it can avoid the problem of increased resistance caused by dust between the incoming current line and the busbar 11, thereby ensuring the stability of the connection between the two.

[0048] In practice, when current convergence is required, first connect the incoming lines of the multiple photovoltaic strings to the circuit breaker 14. Manually grasp the arc-shaped handle 31 and rotate it 90 degrees. At this time, the end of the built-in spring latch 23 will disengage from the concave slot 34 and slide into contact with the limiting slide groove 35. Then, pull the "T"-shaped insulating rod 3 outward. At this time, the helical spring 33 is compressed, and the pressure plate 5 will move away from the wiring through hole 111. When the "J"-shaped latch 4 at the end of the "T"-shaped insulating rod 3 disengages from the wiring through hole 111, manually insert the end of the wire connected from the circuit breaker 14 according to the marked insertion direction. Place it on the surface of busbar 11, and connect the end of the wire and the "T"-shaped insulating rod 3 on the same axis. Then release the "T"-shaped insulating rod 3. The reaction force of the helical spring 33 will drive the "T"-shaped insulating rod 3 to reset. Then rotate the "T"-shaped insulating rod 3 by 90 degrees so that the end of the built-in spring clip 23 is once again engaged in the concave slot 34, thus completing the installation process of the incoming line. Then turn on the DC input module 12. At this time, the current input from the multiple photovoltaic strings will be combined under the action of busbar 11 and then sent to the inverter through the output wire of DC input module 12.

[0049] During the operation of the busbar 11, the heat dissipation fins 22 can absorb the heat from the air around the busbar 11 and discharge it through the heat dissipation channel, thereby achieving the purpose of heat dissipation. During the heat generation process of the busbar 11, the ambient temperature around it continuously rises, and the temperature of the arc-shaped memory metal plate 25 also continuously rises. At this time, the arc-shaped memory metal plate 25 will extend outward, thereby pushing the "L"-shaped plate 24 to rotate outward, opening the heat dissipation vent, thereby increasing the heat dissipation efficiency.

[0050] Example 2:

[0051] The technical solution is basically the same as that in Embodiment 1, see below. Figures 4 to 8 The difference is that: the ends of the “T”-shaped insulating rod 3 are symmetrically equipped with “J”-shaped latches 4, and the side of the “J”-shaped latches 4 is engaged with a check valve assembly 6, which is fixedly connected to the side of the chamfered ceramic plate 2.

[0052] The check valve assembly 6 includes a crossbar 61, a check valve seat 62, a check valve latch 63, and a check valve ball 64. The crossbar 61 is fixedly installed on the inner wall of the U-shaped ceramic plate 2 near the busbar 11. The check valve seat 62 is fixedly installed on the crossbar 61 at the position corresponding to the wiring through hole 111. The check valve latch 63 is symmetrically installed on the check valve seat 62. The end of the check valve latch 63 away from the check valve seat 62 has an arc-shaped structure and extends to the inside of the "J"-shaped latch 4. The check valve ball 64 is fixedly installed at the position of the check valve latch 63 inside the "J"-shaped latch 4.

[0053] The backflow preventer 63 is made of aluminum oxide or aluminum nitride, and the rotating arc-shaped part of the backflow preventer 63 abuts against the surface of the busbar 11.

[0054] In practice, during the initial installation of the incoming line, when the "T"-shaped insulating rod 3 is manually rotated 90 degrees, the "T"-shaped insulating rod 3 will simultaneously rotate the "J"-shaped locking buckle 4 by 90 degrees, thus disengaging the "J"-shaped locking buckle 4 from the restraint of the check ball 64. After the "T"-shaped insulating rod 3 returns to its original position, it will move the "J"-shaped locking buckle 4 back to the inside of the check ball 63. At this time, during the manual rotation of the "T"-shaped insulating rod 3 by 90 degrees, the "J"-shaped locking buckle 4 will rotate to a state where it is engaged with the check ball 64. Since the rotating arc part of the check ball 63 abuts against the surface of the busbar 11, during the subsequent wind vibration of the photovoltaic combiner box, the position where the rotating arc part of the check ball 63 abuts against the surface of the busbar 11 will form a fulcrum, thereby resisting the vibration force on the "J"-shaped locking buckle 4 and improving the stability of the engagement between the two.

[0055] The working principle of this invention during use:

[0056] 1. When current convergence is required, first connect the incoming lines of the multi-phase photovoltaic strings to the circuit breaker 14. Manually grasp the arc-shaped handle 31 and rotate it 90 degrees. At this time, the end of the built-in spring latch 23 will disengage from the concave slot 34 and slide into contact with the limiting slide groove 35. Then pull the "T"-shaped insulating rod 3 outward. At this time, the helical spring 33 is compressed, and the pressure plate 5 will move away from the wiring through hole 111. When the "J"-shaped latch 4 at the end of the "T"-shaped insulating rod 3 disengages from the wiring through hole 111, manually place the end of the wire connected from the circuit breaker 14 according to the marked insertion direction. Connect the end of the wire to the surface of the busbar 11 and the "T"-shaped insulating rod 3 on the same axis. Then release the "T"-shaped insulating rod 3. The reaction force of the helical spring 33 will drive the "T"-shaped insulating rod 3 to reset. Then rotate the "T"-shaped insulating rod 3 by 90 degrees so that the end of the built-in spring clip 23 is once again engaged in the concave slot 34, thus completing the installation process of the incoming line. Then turn on the DC input module 12. At this time, the current input from the multiple photovoltaic strings will be combined under the action of the busbar 11 and then delivered to the inverter through the output wire of the DC input module 12.

[0057] Second: During the operation of the busbar 11, the heat dissipation fins 22 can absorb the heat of the air around the busbar 11 and discharge it through the heat dissipation channel, thereby achieving the purpose of heat dissipation. During the heat generation process of the busbar 11, the ambient temperature around it continues to rise, and the temperature of the arc-shaped memory metal plate 25 also continues to rise. At this time, the arc-shaped memory metal plate 25 will extend outward, thereby pushing the "L"-shaped plate 24 to rotate outward, opening the heat dissipation vent, thereby increasing the heat dissipation efficiency.

[0058] Thirdly, during the initial installation of the incoming line, when the "T"-shaped insulating rod 3 is manually rotated 90 degrees, the "T"-shaped insulating rod 3 will drive the "J"-shaped locking buckle 4 to rotate 90 degrees synchronously, thereby causing the "J"-shaped locking buckle 4 to disengage from the check ball 64. After the "T"-shaped insulating rod 3 is reset, it will drive the "J"-shaped locking buckle 4 to move back to the inside of the check ball 63. At this time, during the manual rotation of the "T"-shaped insulating rod 3, the "J"-shaped locking buckle 4 will rotate to a state where it is engaged with the check ball 64. Since the rotating arc part of the check ball 63 abuts against the surface of the busbar 11, during the subsequent wind vibration of the photovoltaic combiner box, the position where the rotating arc part of the check ball 63 abuts against the surface of the busbar 11 will form a fulcrum, thereby resisting the vibration force on the "J"-shaped locking buckle 4, thus further improving the stability of the engagement between the two.

[0059] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A busbar anti-loosening terminal block for a photovoltaic combiner box, characterized in that, include: Busbar (11) is fixedly installed inside the busbar box (1), and wiring through holes (111) are evenly opened on the busbar (11). The C-shaped ceramic plate (2) and the busbar (11) are horizontally placed through the C-shaped ceramic plate (2). The C-shaped ceramic plate (2) is fixedly connected to the inner wall of the busbar box (1). "T" shaped insulating rod (3), "T" shaped insulating rod (3) is slidably provided on the incline ceramic plate (2) in the direction of the vertical busbar (11), "T" shaped insulating rod (3) passes through the wiring through hole (111); "J" shaped latch (4), "T" shaped insulating rod (3) is symmetrically equipped with "J" shaped latch (4) at the end; The pressure plate (5) is fixedly installed on the "T"-shaped insulating rod (3) at a position away from the "J"-shaped latch (4) and close to the busbar (11). The pressure plate (5) and the end face of the busbar (11) abut against each other. Check component (6), the side of the "J" shaped latch (4) is engaged with the check component (6); The inner side of the incline ceramic plate (2) is uniformly equipped with insulating partitions (21), and heat dissipation channels are formed between multiple insulating partitions (21). Heat dissipation fins (22) are uniformly arranged on the side wall of the insulating partitions (21). Built-in spring clips (23) are fixedly installed on the opposite side walls of the two adjacent insulating partitions (21) at the positions corresponding to the "T"-shaped insulating rods (3); An arc-shaped handle (31) is fixedly installed on the end of the "T"-shaped insulating rod (3) away from the "J"-shaped latch (4). A limit plate (32) is fixedly installed on the "T"-shaped insulating rod (3) near the arc-shaped handle (31). A spiral spring (33) is sleeved on the "T"-shaped insulating rod (3) between the limit plate (32) and the C-shaped ceramic plate (2). The "T"-shaped insulating rod (3) has a concave groove (34) at the position corresponding to the built-in spring clip (23), and a limit groove (35) is provided on the side wall of the "T"-shaped insulating rod (3) between two adjacent concave grooves (34). The check valve assembly (6) includes a crossbar (61), a check valve seat (62), a check valve latch (63), and a check valve ball (64). A crossbar (61) is fixedly installed on the inner wall of the U-shaped ceramic plate (2) near the busbar (11). A check valve seat (62) is fixedly installed on the crossbar (61) at the position corresponding to the wiring through hole (111). A check valve latch (63) is symmetrically installed on the check valve seat (62). The end of the check valve latch (63) away from the check valve seat (62) has an arc-shaped structure and extends to the inside of the "J"-shaped latch (4). A check valve ball (64) is fixedly installed at the position of the check valve latch (63) inside the "J"-shaped latch (4).

2. The anti-loosening terminal block of the photovoltaic combiner box according to claim 1, characterized in that: The bus (11) is made of copper and its surface is silver-plated to reduce contact resistance. At the same time, the insertion direction is marked on its surface near the wiring through hole (111). The insertion direction is coated with a fluorescent coating to facilitate operation at night or in low light environments.

3. The anti-loosening terminal block of the photovoltaic combiner box according to claim 1, characterized in that: The inner diameter of the wiring through hole (111) is 16-20mm, and the distance between the opposite ends of the two "J" shaped latches (4) is 12-20mm.

4. The anti-loosening terminal block of the photovoltaic combiner box according to claim 3, characterized in that: The heat dissipation fins (22) are made of alloy materials, specifically aluminum alloy, copper alloy or copper-aluminum alloy, and the included angle between the heat dissipation fins (22) and the insulating partition (21) is 45°-90°.

5. The anti-loosening terminal block of the photovoltaic combiner box according to claim 1, characterized in that: The incline ceramic plate (2) has symmetrical heat dissipation vents at both ends. An "L"-shaped plate (24) is hinged to the heat dissipation vents by a torsion spring. An arc-shaped memory metal plate (25) is symmetrically fixed on the inner walls of both sides of the incline ceramic plate (2). The end of the arc-shaped memory metal plate (25) is in contact with the corner of the "L"-shaped plate (24).

6. The anti-loosening terminal block of the photovoltaic combiner box according to claim 1, characterized in that: The pressure plate (5) is made of ceramic fiber felt material with compressive deformation capability.

7. The anti-loosening terminal block of the photovoltaic combiner box according to claim 6, characterized in that: The check lock (63) is made of aluminum oxide or aluminum nitride material, and the rotating arc part of the check lock (63) abuts against the surface of the busbar (11).

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