Photovoltaic grid-connected system and photovoltaic grid-connected inverter

Abstract

The present invention discloses a photovoltaic grid-connected system and a photovoltaic grid-connected inverter, which belong to the technical field of photovoltaic power generation; the system comprises an inverter body, a junction box is installed on one side of the inverter body, a connection frame is installed inside the junction box, wiring holes are equidistantly provided inside the connection frame, barrel-type wiring terminals are installed inside the wiring holes, a fixing assembly for fixing the cable is installed at the bottom end of the connection frame at the wiring hole, a connecting sleeve for twisting the cable is installed inside the wiring hole, a support rod for squeezing is provided at the axis of the connecting sleeve inside the connection frame, a clamp is equidistantly installed at the bottom end of the connection frame, two clamps are used for preliminarily fixing the cable, and the support rod supports the cable to contact the barrel-type wiring terminal through the expansion assembly. The present invention adopts a double fixing design in which the clamp and the airbag cooperate with each other up and down, which significantly improves the stability of the cable connection.

Description

Technical Field

[0001] The present invention belongs to the technical field of photovoltaic power generation, and specifically relates to a photovoltaic grid-connected system and a photovoltaic grid-connected inverter. Background Art

[0002] In the marine sector, with the continuous advancement of clean energy utilization, the application of photovoltaic grid-connected systems is becoming increasingly widespread. As a key component of this system, marine photovoltaic inverters are responsible for converting the direct current (DC) generated by photovoltaic panels into alternating current (AC) and connecting it to the grid. However, in actual use, the stability of their connection to the photovoltaic grid-connected cables faces severe challenges.

[0003] Currently, when connecting photovoltaic inverters on ships to the photovoltaic grid, the common method is to first squeeze the cable lugs against the cable conductors before connecting them to the inverter terminals. This connection method can meet basic electrical connection requirements in relatively stable environments. However, ships are constantly subjected to vibrations due to various factors such as waves and currents during navigation. Under long-term vibration, relying solely on squeezing the cable lugs to secure the cable can easily lead to loosening of the connection between the cable and the lugs. Over time, the cable and lugs may even become detached. Once detached, this not only interrupts the normal power supply of the photovoltaic system and affects the ship's power supply, but can also cause electrical failures, posing a potential threat to the ship's navigation safety. Furthermore, frequent loosening and detaching of connections increases the workload and maintenance costs of ship maintenance personnel, reducing the reliability and stability of the photovoltaic grid-connected system. Summary of the Invention

[0004] The present invention overcomes the shortcomings of the prior art and proposes a photovoltaic grid-connected system and a photovoltaic grid-connected inverter. The present invention is achieved through the following technical solutions:

[0005] A photovoltaic grid-connected inverter includes an inverter body, a junction box mounted on one side of the inverter body, a connection frame mounted inside the junction box, wiring holes equidistantly formed inside the connection frame, and cylindrical wiring terminals mounted inside the wiring holes; a connecting sleeve for twisting a cable is mounted inside the wiring hole; a support rod for squeezing is provided inside the connection frame at the axis of the connecting sleeve, the support rod supports the cable through an expansion assembly and enables the cable to contact the cylindrical wiring terminal; a plurality of pairs of clamps are equidistantly mounted on the bottom end of the connection frame, a fixing assembly for fixing the cable is mounted on the bottom end of the connection frame at the wiring hole, and the fixing assembly and the corresponding pair of clamps are used to fix the corresponding cable;

[0006] The expansion assembly includes an eccentric guide rod, the bottom end of the support rod is fixedly connected to the eccentric guide rod, the interior of the support rod is a hollow structure, a piston is slidably installed inside the support rod, an airbag is fixedly connected to the outer wall of the support rod, and through holes are equidistantly opened inside the support rod, which connect the interior of the airbag with the interior of the support rod.

[0007] Furthermore, a tension spring is fixedly connected between the interior of the support rod and the piston, a top end of the piston is fixedly connected to a push rod, and one end of the push rod extends out of the support rod.

[0008] Furthermore, one side of the connecting frame is rotatably connected to a cover plate, and a driving gear is fixedly connected to the connection between the cover plate and the connecting frame. The connecting frame is rotatably connected to a transmission gear inside, and the connecting frame is rotatably connected to a connecting shaft inside. One end of the connecting shaft is fixedly connected to a driven gear, and the transmission gear is meshed with the driving gear and the driven gear respectively. One end of the connecting shaft is equidistantly fixedly connected to a worm, and the connecting frame is rotatably connected to a worm wheel inside. Several of the worm wheels are respectively meshed with corresponding worms, and square grooves are provided inside several of the worm wheels. The top of the connecting sleeve is fixedly connected to a hollow square guide rod, and the hollow square guide rod is slidably connected to the corresponding square groove.

[0009] Furthermore, an L-shaped slide is equidistantly and slidingly connected to the interior of the connecting frame, a guide groove is provided inside the L-shaped slide, the top of the connecting sleeve is rotatably connected to the guide sleeve, the outer wall of the guide sleeve is symmetrically and fixedly connected with a shift post, an L-shaped slide groove is symmetrically provided inside the guide groove, the two shift posts are respectively slidably connected to the corresponding L-shaped slide grooves, a cam is equidistantly and fixedly connected to the axis of the cover plate, the outer walls of several of the cams are fixedly connected with a shift block, a first return spring is fixedly connected between the L-shaped slide and the connecting frame; a trapezoidal push rod is slidably connected to one end of the L-shaped slide, and a second return spring is installed between the trapezoidal push rod and the L-shaped slide; the inclined surface of the trapezoidal push rod is used to contact the push rod fixed at the top of the piston inside the support rod, pushing the push rod to drive the piston down.

[0010] Furthermore, an avoidance groove is provided at one end of the L-shaped slide away from the connecting sleeve.

[0011] Furthermore, a bolt is fixedly connected to the top of the connection frame, and a connection ear is fixedly connected to one end of the cover plate. The connection ear is used to pass the bolt, and the bolt is threadedly connected to a nut.

[0012] Furthermore, the interior of the support rod is filled with hydraulic oil, the interior of the connecting sleeve is fixedly connected with strip-shaped anti-slip grooves at equal intervals, and the rotation direction of the connecting sleeve is opposite to the rotation direction of the cable.

[0013] Furthermore, one end of one of the shift posts is fixedly connected to a small rack, a small gear is rotatably connected inside the connecting frame, the small gear is meshed with the small rack, one side of the small gear is fixedly connected to a large gear, the top of the support rod is fixedly connected to an L-shaped large rack, and the large gear is meshed with the L-shaped large rack; the gear ratio between the small gear and the large gear is 1:3, and the gear ratio between the driving gear and the driven gear is 3:1.

[0014] Furthermore, the fixing assembly includes a connecting column, and the bottom end of the connecting frame is located on both sides of the wiring hole and is rotatably connected to the connecting column, one end of the two connecting columns is fixedly connected to the corresponding pair of clamps, and the outer wall of the connecting column is provided with a vertical groove, and the outer wall of the connecting column is provided with a spiral groove, one end of the vertical groove is connected to one end of the spiral groove, and starting from the connection with the vertical groove, the depth of the spiral groove gradually deepens; the inside of the connecting frame is equidistantly and symmetrically connected to the paddle for sliding connection, one side of the paddle is fixedly connected to the buffer rod, and the inside of the connecting frame is equidistantly and rotatably connected to a U-shaped paddle, and the two ends of the U-shaped paddle are symmetrically provided with buffer grooves, the buffer groove is slidably connected to the buffer rod, the inside of the paddle is slidably connected to a dial rod, and a third return spring is fixedly connected between the dial rod and the paddle.

[0015] A photovoltaic grid-connected system comprises the photovoltaic grid-connected inverter according to any one of claims 1 to 3.

[0016] The beneficial effects of the present invention compared to the prior art are:

[0017] 1. Stable connection, no fear of vibration:

[0018] The present invention adopts a dual fixing design of the clamp and the airbag working together up and down, which significantly improves the stability of the connection; when the cable is connected, the U-shaped lever is toggled to drive the paddle to move the toggle rod along the vertical groove and spiral groove on the outer wall of the connecting column, thereby driving the connecting column to rotate, so that the clamp holds the cable sheath tightly, providing initial fixing force; when the cover plate rotates, a series of gear transmissions cause the connecting sleeve to rotate and first descend and then ascend. When the connecting sleeve descends, it rotates in the opposite direction to loosen the cable spiral, and when the connecting sleeve ascends, the support rod is lowered through the gear linkage, so that the eccentric guide rod on the support rod is inserted into the cable; at the same time, during the rotation of the cover plate, the cam squeezes the L-shaped slide plate, so that the trapezoidal push rod pushes the piston in the support rod, and the hydraulic oil supports the airbag through the through hole, squeezing the cable and the cylindrical terminal to fit tightly; in addition, when the U-shaped lever drives the paddle to move, the paddle is slidably connected to the buffer groove of the U-shaped lever through the buffer rod, forming a unique anti-reset mechanism, ensuring that the connection structure is stable when the ship vibrates, greatly reducing the risk of cable falling off, and effectively ensuring the continuous and stable operation of the photovoltaic grid-connected system in a vibration environment.

[0019] 2. Continuous process and easy operation:

[0020] From opening the junction box to completing the cable connection, the entire process is cleverly designed, with all components working closely together to form an integrated operating process, greatly improving work efficiency. After opening the junction box door and unscrewing the nuts to release the connection ear restrictions, a series of linked operations can be initiated by rotating the cover. The rotation of the cover drives the active gear, which rotates the driven gear through the transmission gear, and then rotates the connecting shaft and worm, driving the worm wheel to rotate, and the hollow square guide rod drives the connecting sleeve to rotate through the square groove, thereby loosening the cable spiral. At the same time, the cam on the cover squeezes the L-shaped slide, causing the shifting post on the guide sleeve to slide along the L-shaped groove, driving the connecting sleeve to first descend and then ascend, completing the cable processing and the insertion of the support rod. The entire process does not require additional tools or complex operations. The staff only needs to rotate the cover according to the steps to easily complete the connection between the cable and the inverter, greatly reducing the difficulty of manual operation.

[0021] 3. Flexible structure and strong adaptability:

[0022] The wiring holes and related components are ingeniously designed to accommodate cables of different specifications to meet diverse usage needs. The clamp adjusts its tightness by rotating the connecting column, and the airbag adjusts its expansion according to the downward pressure of the piston in the strut, ensuring a stable connection for both thinner and thicker cables. In addition, structures such as the buffer rod and buffer groove can effectively cushion the impact when the ship vibrates. When the U-shaped lever drives the paddle to move, the paddle slides and connects to the buffer groove of the U-shaped lever through the buffer rod, reducing the direct impact of vibration on the connecting column and clamp, protecting the connection parts, extending the service life of the equipment, and enhancing the adaptability and reliability of the entire wiring structure under complex ship working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the internal structure of the junction box of the present invention;

[0025] Figure 3 This is a schematic diagram of a partial cross-sectional structure of the connection frame of the present invention;

[0026] Figure 4 This is a schematic diagram of the wiring hole structure of the present invention;

[0027] Figure 5 This is a schematic diagram of the internal structure of the connection frame of the present invention;

[0028] Figure 6 for Figure 5 Schematic diagram of the structure at A in the middle;

[0029] Figure 7 This is a schematic diagram of the worm gear connection structure of the present invention;

[0030] Figure 8 This is a schematic diagram of the hollow square guide rod structure of the present invention;

[0031] Figure 9 This is a schematic diagram of the L-shaped slide structure of the present invention;

[0032] Figure 10 This is a schematic diagram of a side cross-sectional structure of a support rod of the present invention;

[0033] Figure 11 This is a schematic diagram of the structure of the clamp and the U-shaped shift rod of the present invention;

[0034] Figure 12 This is a schematic diagram of the vertical groove and spiral groove structure of the present invention;

[0035] Figure 13 Schematic diagram of the structure of the plectrum of the present invention;

[0036] Figure 14 for Figure 13 Enlarged view of point B in the middle.

[0037] In the picture:

[0038] 1. Inverter body; 2. Junction box; 3. Connection frame; 4. Wiring hole; 5. Cylindrical terminal; 6. Connecting sleeve; 7. Support rod; 8. Clamp; 9. Eccentric guide rod; 10. Piston; 11. Air bag; 12. Through hole; 31. Cover plate; 32. Driving gear; 33. Transmission gear; 34. Connecting shaft; 35. Driven gear; 36. Worm; 37. Worm wheel; 38. Square slide; 39. Hollow square guide rod; 41. L-shaped slide; 42. Guide groove; 43. Guide sleeve; 4 4. Shift column; 45. L-shaped slide; 46. Cam; 47. Shift block; 48. First return spring; 51. Trapezoidal push rod; 52. Second return spring; 53. Avoidance groove; 61. Small rack; 62. Small gear; 63. Large gear; 64. L-shaped large rack; 71. Tension spring; 72. Push rod; 91. Connecting column; 92. Vertical groove; 93. Spiral groove; 94. Shift piece; 95. Buffer rod; 96. U-shaped shift rod; 97. Buffer groove; 98. Turning rod; 99. Third return spring. DETAILED DESCRIPTION

[0039] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail with reference to the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention. The technical solutions of the present invention will be described in detail below with reference to the embodiments and the accompanying drawings, but the scope of protection is not limited thereto.

[0040] See also Figures 1 to 14This embodiment provides a photovoltaic grid-connected inverter, comprising an inverter body 1. A junction box 2 is mounted on one side of the inverter body 1. A connection frame 3 is mounted inside the junction box 2. Wiring holes 4 are equidistantly defined at the bottom of the connection frame 3. Cylindrical terminals 5 are mounted inside the wiring holes 4. A connecting sleeve 6 for twisting the cable is mounted inside the wiring holes 4. A support rod 7 for squeezing the cable is located at the axis of the connecting sleeve 6 within the connection frame 3. The support rod 7 supports the cable through an expansion assembly and allows the cable to contact the cylindrical terminals 5. Multiple pairs of clamps 8 are equidistantly mounted at the bottom of the connection frame 3. A fixing assembly for securing the cable is mounted at the bottom of the connection frame 3, located near the wiring holes 4. The fixing assembly and the corresponding pair of clamps 8 are used to initially secure the corresponding cable.

[0041] The expansion assembly includes an eccentric guide rod 9, which is fixedly connected to the bottom end of a support rod 7. The support rod 7 has a hollow interior, and a piston 10 is slidably mounted inside the support rod 7. An airbag 11 is fixedly connected to the outer wall of the support rod 7. Through holes 12 are evenly spaced within the support rod 7, connecting the interior of the airbag 11 with the interior of the support rod 7. A tension spring 71 is fixedly connected between the interior of the support rod 7 and the piston 10. A push rod 72 is fixedly connected to the top of the piston 10, and one end of the push rod 7 extends out of the support rod 7. The interior of the support rod 7 is filled with hydraulic oil. Anti-slip strips are fixedly connected to the interior of the connecting sleeve 6 at equal intervals, and the connecting sleeve 6 rotates in the opposite direction of the cable.

[0042] The connecting frame 3 is rotatably connected to a cover plate 31 on one side, and a driving gear 32 is fixedly connected to the connection between the cover plate 31 and the connecting frame 3. The connecting frame 3 is rotatably connected to a transmission gear 33 inside the connecting frame 3. The connecting frame 3 is rotatably connected to a connecting shaft 34 inside the connecting frame 3. One end of the connecting shaft 34 is fixedly connected to a driven gear 35. The transmission gear 33 is meshed with the driving gear 32 and the driven gear 35 respectively. One end of the connecting shaft 34 is equidistantly fixedly connected to a worm 36. A worm gear 37 is rotatably connected to the inside of the connecting frame 3. Several of the worm gears 37 are respectively meshed with corresponding worm gears 36. Square grooves 38 are provided inside several of the worm gears 37. The top of the connecting sleeve 6 is fixedly connected to a hollow square guide rod 39, which is slidably connected to the corresponding square groove 38. The top of the connecting frame 3 is fixedly connected to a bolt, and one end of the cover plate 31 is fixedly connected to a connecting ear. The connecting ear is used to pass a bolt, and the bolt is threaded with a nut.

[0043] The connecting frame 3 is equidistantly and slidingly connected with an L-shaped slide 41 inside, a guide groove 42 is provided inside the L-shaped slide 41, the top of the connecting sleeve 6 is rotatably connected with a guide sleeve 43, the outer wall of the guide sleeve 43 is symmetrically and fixedly connected with a shift post 44, and the guide groove 42 is symmetrically provided with an L-shaped slide 45. The two shift posts 44 are respectively slidably connected to the corresponding L-shaped slide 45, and a cam 46 is equidistantly and fixedly connected to the axis of the cover plate 31. The outer walls of several of the cams 46 are fixedly connected with a shift block 47. A first return spring 48 is fixedly connected between the L-shaped slide 41 and the connecting frame 3.

[0044] One end of the L-shaped slide 41 is slidably connected to a trapezoidal push rod 51, with a second return spring 52 installed between the trapezoidal push rod 51 and the L-shaped slide 41. A relief groove 53 is defined at the end of the L-shaped slide 41 away from the connecting sleeve 6. The inclined surface of the trapezoidal push rod 51 contacts a push rod 72 fixed to the top of the piston 10 inside the support rod 7, pushing the push rod 72 to cause the piston 10 to descend.

[0045] One end of one of the shifting posts 44 is fixedly connected to a small rack 61. A small gear 62 is rotatably connected to the interior of the connecting frame 3. The small gear 62 meshes with the small rack 61. A large gear 63 is fixedly connected to one side of the small gear 62. The top of the support rod 7 is fixedly connected to an L-shaped large rack 64. The large gear 63 meshes with the L-shaped large rack 64. The gear ratio between the small gear 62 and the large gear 63 is 1:3, and the gear ratio between the driving gear 32 and the driven gear 35 is 3:1.

[0046] The fixing assembly includes a connecting column 91, and the bottom end of the connecting frame 3 is located on both sides of the wiring hole 4 and is rotatably connected to the connecting column 91. One end of the two connecting columns 91 is fixedly connected to the corresponding pair of clamps 8 (i.e., two clamps 8). A vertical groove 92 is provided on the outer wall of the connecting column 91, and a spiral groove 93 is provided on the outer wall of the connecting column 91. One end of the vertical groove 92 is connected to one end of the spiral groove 93, and starting from the connection with the vertical groove 92, the depth of the spiral groove 93 gradually deepens; a paddle 94 is symmetrically and slidably connected to the inside of the connecting frame 3, and a buffer rod 95 is fixedly connected to one side of the paddle 94. A U-shaped paddle 96 is equidistantly and rotatably connected to the inside of the connecting frame 3, and buffer grooves 97 are symmetrically provided at both ends of the U-shaped paddle 96. The buffer groove 97 is slidably connected to the buffer rod 95. The inside of the paddle 94 is slidably connected to a toggle rod 98, and a third return spring 99 is fixedly connected between the toggle rod 98 and the paddle 94.

[0047] This embodiment further provides a photovoltaic grid-connected system, which includes the photovoltaic grid-connected inverter.

[0048] The working principle of a photovoltaic grid-connected inverter:

[0049] 1. Initial preparation stage:

[0050] When connecting the marine photovoltaic inverter to the photovoltaic grid-connected conductors, the first step is to open the door of the junction box 2, remove the nuts, and release the restrictions on the connecting ears. This allows the cover 31 to be smoothly rotated and opened to a wide angle with the junction box 2, providing sufficient space for subsequent operations. At this point, the connection frame 3 and related components inside the junction box 2 are ready for cable connection.

[0051] 2. Initial cable fixing stage:

[0052] Insert the stripped cable into the wiring hole 4, and then move the U-shaped lever 96. When the U-shaped lever 96 is moved from top to bottom, the buffer grooves 97 symmetrically opened at both ends of the lever will drive the buffer rod 95 slidably connected to it to move, and the buffer rod 95 is connected to the paddle 94, thereby driving the paddle 94 to move downward. The turning rod 98 on the paddle 94 will first slide from top to bottom along the vertical groove 92 opened on the outer wall of the connecting column 91. When it reaches the connection point between the vertical groove 92 and the spiral groove 93, the turning rod 98 will move along the spiral groove 93. Since the depth of the spiral groove 93 gradually deepens from the connection point of the vertical groove 92, the turning rod 98 will drive the connecting column 91 to rotate when it moves in the spiral groove 93, and then the two clamps 8 fixedly connected to the connecting column 91 will rotate, and finally hold the protective skin end of the cable, completing the initial fixation of the cable. During this process, the turning rod 98 is gradually inserted into the spiral groove 93 under the elastic force of the third reset spring 99, so that the elastic force of the third reset spring 99 is gradually released, so that the U-shaped turning rod 96 will not be easily reset in the environment of ship vibration, thereby ensuring the stability of the clamp 8 in fixing the cable.

[0053] 3. Cable processing and support rod 7 preparation stage:

[0054] Rotate the cover plate 31. This rotation drives the driving gear 32, which is fixed to the connection between the cover plate 31 and the connecting frame 3, to rotate. The driving gear 32 is meshed with the driven gear 35 via the transmission gear 33, thereby driving the driven gear 35 to rotate, thereby rotating the connecting shaft 34. A worm 36 is equidistantly fixed to one end of the connecting shaft 34. The worm 36 rotates as the connecting shaft 34 rotates. The worm 36, in turn, meshes with the worm gear 37, driving the worm gear 37 to rotate. A square slot 38 is provided inside the worm gear 37. A hollow square guide rod 39, which is fixedly connected to the top of the connecting sleeve 6, slides within the square slot 38. The rotation of the worm gear 37 drives the hollow square guide rod 39 to rotate through the square slot 38, thereby rotating the connecting sleeve 6.

[0055] Simultaneously, cams 46, equidistantly fixed to the axis of the cover plate 31, compress the L-shaped slide 41 during rotation, causing it to compress the first return spring 48 and move downward. A guide slot 42 is defined within the L-shaped slide 41. Shifting posts 44 are symmetrically fixed to the outer wall of a guide sleeve 43, to which the top of the connecting sleeve 6 is pivoted. These two shifting posts 44 are slidably connected to L-shaped slots 45 symmetrically defined within the guide slot 42. As the L-shaped slide 41 moves, it drives the shifting posts 44 on the guide sleeve 43 to slide along the L-shaped slots 45, causing the connecting sleeve 6 to first descend and then ascend.

[0056] Since the direction of rotation of the connecting sleeve 6 is opposite to the spiral direction of the cable, the connecting sleeve 6 can also rotate while descending, thereby loosening the spiral of the cable and facilitating the subsequent insertion of the strut 7. When the connecting sleeve 6 rises, it no longer contacts the cable. At this time, a lever 44 on the guide sleeve 43 will drive the small rack 61 fixed to it to move, and the small rack 61 engages with the small gear 62, driving the small gear 62 to rotate. The small gear 62 is fixedly connected to the large gear 63, and the large gear 63 engages with the L-shaped large rack 64 fixed at the top of the strut 7, and finally drives the L-shaped large rack 64 to descend. Since the gear ratio between the small gear 62 and the large gear 63 is 1:3, the distance the connecting sleeve 6 rises is one-third of the distance the strut 7 descends. At this time, the cable loses the restriction of the connecting sleeve 6 and opens in a dispersed manner, and the eccentric guide rod 9 on the strut 7 can be smoothly inserted into the interior of the cable.

[0057] 4. Final fixing stage of the cable:

[0058] As the cover plate 31 continues to rotate, the cam 46 fixed on the cover plate 31 continues to drive the L-shaped slide 41 to move, and the trapezoidal push rod 51 slidably connected to one end of the L-shaped slide 41 will stretch the second return spring 52 during the movement. The inclined surface of the trapezoidal push rod 51 will contact the push rod 72 fixed on the top of the piston 10 inside the support rod 7, pushing the push rod 72 to drive the piston 10 to descend. The support rod 7 is filled with hydraulic oil. When the piston 10 descends, the hydraulic oil will flow into the airbag 11 through the through holes 12 equidistantly opened inside the support rod 7, causing the airbag 11 to expand. The expanded airbag 11 continuously squeezes the cable so that it is in close contact with the inner wall of the tubular terminal 5. At this time, the cable is fixed on both sides by the clamp 8 below and the expanded airbag 11 above, forming a stable connection structure, which effectively prevents the connection between the cable and the inverter from falling off when the ship vibrates, and ensures the stable operation of the photovoltaic grid-connected system in the ship's vibration environment.

[0059] The above content is a further detailed description of the present invention in combination with a specific preferred embodiment. It cannot be considered that the specific embodiments of the present invention are limited to this. For ordinary technicians in the technical field to which the present invention belongs, they can make several simple deductions or substitutions without departing from the present invention, which should be regarded as belonging to the scope of patent protection determined by the submitted claims of the present invention.

Claims

1. A photovoltaic grid-connected inverter, comprising an inverter body (1), a junction box (2) installed on one side of the inverter body (1), a connection frame (3) installed inside the junction box (2), wiring holes (4) equidistantly formed inside the connection frame (3), and cylindrical connection terminals (5) installed inside the wiring holes (4); characterized in that: A connecting sleeve (6) for twisting the cable is installed inside the wiring hole (4), and a support rod (7) for squeezing is provided inside the connecting frame (3) at the axis of the connecting sleeve (6). The support rod (7) supports the cable through the expansion component and makes the cable contact the cylindrical terminal (5); a plurality of pairs of clamps (8) are installed at equal intervals at the bottom end of the connecting frame (3), and a fixing component for fixing the cable is installed at the bottom end of the connecting frame (3) at the wiring hole (4). The fixing component and the corresponding pair of clamps (8) are used to fix the corresponding cable; The expansion assembly includes an eccentric guide rod (9), the bottom end of the support rod (7) is fixedly connected to the eccentric guide rod (9), the interior of the support rod (7) is a hollow structure, a piston (10) is slidably installed inside the support rod (7), an air bag (11) is fixedly connected to the outer wall of the support rod (7), and through holes (12) are equidistantly opened inside the support rod (7), and the through holes (12) connect the interior of the air bag (11) with the interior of the support rod (7).

2. The photovoltaic grid-connected inverter according to claim 1, characterized in that: A tension spring (71) is fixedly connected between the interior of the support rod (7) and the piston (10), and a top end of the piston (10) is fixedly connected to a push rod (72), with one end of the push rod (72) extending out of the support rod (7).

3. The photovoltaic grid-connected inverter according to claim 2, characterized in that: One side of the connecting frame (3) is rotatably connected to a cover plate (31), a driving gear (32) is fixedly connected to the connection between the cover plate (31) and the connecting frame (3), a transmission gear (33) is rotatably connected inside the connecting frame (3), a connecting shaft (34) is rotatably connected inside the connecting frame (3), one end of the connecting shaft (34) is fixedly connected to a driven gear (35), the transmission gear (33) is meshed with the driving gear (32) and the driven gear (35) respectively, one end of the connecting shaft (34) is equidistantly fixedly connected to a worm (36), a worm wheel (37) is rotatably connected inside the connecting frame (3), a plurality of the worm wheels (37) are respectively meshed with the corresponding worm wheels (36), a square slot (38) is provided inside the plurality of the worm wheels (37), a hollow square guide rod (39) is fixedly connected to the top end of the connecting sleeve (6), and the hollow square guide rod (39) is slidably connected to the corresponding square slot (38).

4. The photovoltaic grid-connected inverter according to claim 3, characterized in that: The connection frame (3) is equidistantly slidably connected to an L-shaped slide plate (41) inside, a guide groove (42) is provided inside the L-shaped slide plate (41), the top end of the connection sleeve (6) is rotatably connected to a guide sleeve (43), the outer wall of the guide sleeve (43) is symmetrically fixedly connected to a shifting post (44), the guide groove (42) is symmetrically provided with an L-shaped slide groove (45), the two shifting posts (44) are respectively slidably connected to the corresponding L-shaped slide groove (45), the axis of the cover plate (31) is equidistantly fixedly connected to a cam (46), and a plurality of the The outer wall of the cam (46) is fixedly connected with a shift block (47), and a first return spring (48) is fixedly connected between the L-shaped slide plate (41) and the connecting frame (3); one end of the L-shaped slide plate (41) is slidably connected with a trapezoidal push rod (51), and a second return spring (52) is installed between the trapezoidal push rod (51) and the L-shaped slide plate (41); the inclined surface of the trapezoidal push rod (51) is used to contact the push rod (72) fixed at the top end of the piston (10) inside the support rod (7), pushing the push rod (72) to drive the piston (10) to descend.

5. The photovoltaic grid-connected inverter according to claim 4, characterized in that: An avoidance groove (53) is provided at one end of the L-shaped slide plate (41) away from the connecting sleeve (6).

6. The photovoltaic grid-connected inverter according to claim 3, characterized in that: The top of the connection frame (3) is fixedly connected with a bolt, and one end of the cover plate (31) is fixedly connected with a connection ear, the connection ear is used to pass the bolt, and the bolt is threadedly connected with a nut.

7. The photovoltaic grid-connected inverter according to claim 4, characterized in that: The support rod (7) is filled with hydraulic oil, the connection sleeve (6) is fixedly connected with strip-shaped anti-slip grooves at equal intervals, and the rotation direction of the connection sleeve (6) is opposite to the rotation direction of the cable.

8. The photovoltaic grid-connected inverter according to claim 4, characterized in that: One end of one of the shifting posts (44) is fixedly connected to a small rack (61), a small gear (62) is rotatably connected inside the connecting frame (3), the small gear (62) is meshed with the small rack (61), one side of the small gear (62) is fixedly connected to a large gear (63), the top end of the support rod (7) is fixedly connected to an L-shaped large rack (64), and the large gear (63) is meshed with the L-shaped large rack (64); the gear ratio between the small gear (62) and the large gear (63) is 1:3, and the gear ratio between the driving gear (32) and the driven gear (35) is 3:

1.

9. The photovoltaic grid-connected inverter according to claim 1, characterized in that: The fixing assembly includes a connecting column (91), the bottom end of the connecting frame (3) is located on both sides of the wiring hole (4) and is rotatably connected to the connecting column (91), one end of the two connecting columns (91) is fixedly connected to the corresponding pair of clamps (8), the outer wall of the connecting column (91) is provided with a vertical groove (92), the outer wall of the connecting column (91) is provided with a spiral groove (93), one end of the vertical groove (92) is connected to one end of the spiral groove (93), and starting from the connection with the vertical groove (92), the depth of the spiral groove (93) gradually increases. The connecting frame (3) is symmetrically connected to the paddle (94) in an equidistant and symmetrical sliding manner. A buffer rod (95) is fixedly connected to one side of the paddle (94). The connecting frame (3) is equidistantly connected to the U-shaped paddle (96) in rotation. Buffer grooves (97) are symmetrically provided at both ends of the U-shaped paddle (96). The buffer groove (97) is slidably connected to the buffer rod (95). The paddle (94) is slidably connected to a dial rod (98). A third return spring (99) is fixedly connected between the dial rod (98) and the paddle (94).

10. A photovoltaic grid-connected system, characterized in that: The invention comprises the photovoltaic grid-connected inverter according to any one of claims 1 to 9.

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