Photovoltaic grid-connected system and photovoltaic grid-connected inverter

Abstract

The invention discloses a photovoltaic grid-connected system and a photovoltaic grid-connected inverter, and belongs to the technical field of photovoltaic power generation. Comprising an inverter body, a junction box is installed on one side of the inverter body, a connecting frame is installed in the junction box, wiring holes are formed in the connecting frame at equal intervals, cylindrical wiring terminals are installed in the wiring holes, and fixing assemblies used for fixing cables are installed at the positions, located at the wiring holes, of the bottom end of the connecting frame. A connecting sleeve used for twisting a cable is installed in the wiring hole, a supporting rod used for extrusion is arranged at the position, located at the axis of the connecting sleeve, in the connecting frame, hoops are installed at the bottom end of the connecting frame at equal intervals, the two hoops are used for preliminarily fixing the cable, and the supporting rod supports the cable through an expansion assembly to make contact with the cylindrical wiring terminal. According to the invention, a dual-fixation design that the hoop and the air bag cooperate up and down is adopted, and the stability of cable connection is significantly improved.

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 field, with the continuous advancement of clean energy utilization, the application of photovoltaic grid-connected systems is becoming more and more widespread. As a key device in the system, the photovoltaic inverter used in ships undertakes the important task of converting the direct current generated by photovoltaic panels into alternating current and connecting it to the power grid. However, in actual use, the connection stability between it and the photovoltaic grid-connected wire faces severe challenges. At present, when the photovoltaic inverter for ships is connected to the photovoltaic grid-connected connecting wire, the commonly used method is to first squeeze the wire ear and the conductor of the cable, and then connect it to the wiring terminal of the inverter. This connection method can meet the basic electrical connection requirements in a relatively stable environment. However, during the navigation of the ship, due to the influence of various factors such as waves and water currents, vibrations are generated all the time. Under the long-term and continuous vibration, it is very easy to cause the connection between the cable and the wire ear to gradually loosen if the cable is fixed only by squeezing the wire ear. Over time, the cable and the wire ear may even fall off. Once it falls off, it will not only interrupt the normal power supply of the photovoltaic system and affect the power supply of the ship, but also may cause electrical failures, posing a potential threat to the navigation safety of the ship. In addition, the frequent loosening and falling problems of the connection also increase the workload and maintenance costs of ship maintenance personnel, and reduce the reliability and stability of the photovoltaic grid-connected system. Summary of the invention

[0003] 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: A photovoltaic grid-connected inverter 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, and cylindrical wiring terminals are installed inside the wiring holes; a connection sleeve for twisting a cable is installed inside the wiring hole, a support rod for squeezing is provided at the axis of the connection sleeve inside the connection frame, the support rod supports the cable through an expansion assembly and makes the cable contact the cylindrical wiring terminal; a plurality of pairs of clamps are equidistantly installed at the bottom end of the connection frame, a fixing assembly for fixing the cable is installed at 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 cables; 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.

[0004] Furthermore, a tension spring is fixedly connected between the interior of the support rod and the piston, a push rod is fixedly connected to the top of the piston, and one end of the push rod extends out of the support rod.

[0005] Furthermore, a cover plate is rotatably connected to one side of the connecting frame, a driving gear is fixedly connected to the connection between the cover plate and the connecting frame, a transmission gear is rotatably connected inside the connecting frame, a connecting shaft is rotatably connected inside the connecting frame, one end of the connecting shaft is fixedly connected to a driven gear, the transmission gear is meshed with the driving gear and the driven gear respectively, a worm is equidistantly fixedly connected to one end of the connecting shaft, a worm wheel is rotatably connected inside the connecting frame, several of the worm wheels are respectively meshed with corresponding worms, square grooves are opened inside several of the worm wheels, a hollow square guide rod is fixedly connected to the top of the connecting sleeve, and the hollow square guide rod is slidably connected to the corresponding square groove.

[0006] Furthermore, an L-shaped slide is equidistantly and slidingly connected inside 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 shifting post, an L-shaped slide groove is symmetrically provided inside the guide groove, two of the shifting posts are respectively slidably connected to the corresponding L-shaped slide grooves, cams are equidistantly and fixedly connected at the axis of the cover plate, and the outer walls of several of the cams are fixedly connected with shifting blocks, and 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 to descend.

[0007] Furthermore, an avoidance groove is provided at one end of the L-shaped slide plate away from the connecting sleeve.

[0008] 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.

[0009] Furthermore, hydraulic oil is filled inside the support rod, strip-shaped anti-skid patterns are equidistantly fixedly connected inside the connecting sleeve, and the rotation direction of the connecting sleeve is opposite to the rotation direction of the cable.

[0010] Furthermore, one end of one of the shifting posts is fixedly connected to a small rack, a small gear is rotatably connected inside the connecting frame, the small gear is meshingly connected to 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, the large gear is meshingly connected to 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.

[0011] Furthermore, the fixing component 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 respectively fixedly connected to the corresponding pair of clamps, a vertical groove is opened on the outer wall of the connecting column, and a spiral groove is opened on the outer wall of the connecting column, 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; a paddle is equidistantly and symmetrically slidably connected inside the connecting frame, a buffer rod is fixedly connected to one side of the paddle, a U-shaped paddle is equidistantly and rotatably connected inside the connecting frame, buffer grooves are symmetrically opened at both ends of the U-shaped paddle, the buffer groove is slidably connected to the buffer rod, the paddle is slidably connected to a rotating rod, and a third return spring is fixedly connected between the rotating rod and the paddle.

[0012] A photovoltaic grid-connected system comprises the photovoltaic grid-connected inverter as claimed in any one of claims 1 to 3.

[0013] The beneficial effects of the present invention compared with the prior art are as follows: 1. Stable connection, no fear of vibration: The present invention adopts a double 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 dial rod along the vertical groove and spiral groove of the outer wall of the connecting column, thereby driving the connecting column to rotate, so that the clamp holds the cable sheath tightly to provide 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, and 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 top rod pushes the piston in the support rod, and the hydraulic oil props up 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 vibrating environment.

[0014] 2. Continuous process and easy operation: From opening the junction box to completing the cable connection, the entire process is cleverly designed, with each component working closely together to form an integrated operating process, greatly improving work efficiency; after opening the junction box door and unscrewing the nut to release the connection ear restriction, a series of linkage 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 the worm, driving the worm wheel to rotate, and the hollow square guide rod drives the connecting sleeve to rotate through the square slide groove, thereby loosening the cable spiral; at the same time, the cam on the cover squeezes the L-shaped slide plate, causing the lever on the guide sleeve to slide along the L-shaped slide 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 complicated operations, and 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. 3. Flexible structure and strong adaptability: The wiring holes and related components are cleverly designed to accommodate cables of different specifications to meet diverse usage requirements. The clamp adjusts the degree of tightness by rotating the connecting column, and the airbag adjusts the amount of expansion according to the degree of downward pressure of the piston in the strut, so that both thinner and thicker cables can be stably connected. In addition, structures such as the buffer rod and buffer groove can effectively buffer the impact when the ship vibrates. 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, which can reduce the direct impact of vibration on the connecting column and the clamp, protect the connection parts, extend the service life of the equipment, and enhance the adaptability and reliability of the entire wiring structure under complex ship working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the junction box of the present invention; Figure 3 It is a schematic diagram of a partial cross-sectional structure of a connection frame of the present invention; Figure 4 This is a schematic diagram of the wiring hole structure of the present invention; Figure 5 This is a schematic diagram of the internal structure of the connection frame of the present invention; Figure 6 for Figure 5 The structural diagram at A in the middle; Figure 7 It is a schematic diagram of the worm gear connection structure of the present invention; Figure 8 This is a schematic diagram of the hollow square guide rod structure of the present invention; Fig. 9 This is a schematic diagram of the L-shaped slide structure of the present invention; Fig.10 It is a schematic diagram of the cross-sectional structure of the support rod of the present invention; Fig.11 It is a schematic diagram of the structure of the clamp and the U-shaped lever of the present invention; Fig.12 It is a schematic diagram of the vertical groove and spiral groove structure of the present invention; Fig.13 It is a structural schematic diagram of the plectrum of the present invention; Fig.14 for Fig.13 Enlarged view of point B in the middle.

[0016] In the figure: 1. Inverter body; 2. Junction box; 3. Connection frame; 4. Wiring hole; 5. Cylindrical terminal; 6. Connection sleeve; 7. Support rod; 8. Hoop; 9. Eccentric guide rod; 10. Piston; 11. Airbag; 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 groove; 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

[0017] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention is further described in detail in conjunction with the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. The technical solutions of the present invention are described in detail below in conjunction with the embodiments and the accompanying drawings, but the scope of protection is not limited thereto.

[0018] See also Figures 1 to 14 This embodiment proposes a photovoltaic grid-connected inverter, including an inverter body 1, a junction box 2 is installed on one side of the inverter body 1, a connection frame 3 is installed inside the junction box 2, a connection hole 4 is equidistantly opened at the bottom of the connection frame 3, a cylindrical connection terminal 5 is installed inside the connection hole 4, a connection sleeve 6 for twisting the cable is installed inside the connection hole 4, a support rod 7 for squeezing is provided at the axis of the connection sleeve 6 inside the connection frame 3, the support rod 7 supports the cable through an expansion component and makes the cable contact the cylindrical connection terminal 5. A plurality of pairs of clamps 8 are equidistantly installed at the bottom of the connection frame 3, a fixing assembly for fixing the cable is installed at the bottom of the connection frame 3 at the connection hole 4, and the fixing assembly and the corresponding pair of clamps 8 are used to preliminarily fix the corresponding cable.

[0019] 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 hollow, 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 inside of the air bag 11 with the inside of the support rod 7. A tension spring 71 is fixedly connected between the inside of the support rod 7 and the piston 10, and a push rod 72 is fixedly connected to the top of the piston 10, and one end of the push rod 72 extends out of the support rod 7. Hydraulic oil is injected into the support rod 7, and strip anti-slip patterns are fixedly connected to the inside of the connecting sleeve 6 at equidistant intervals, and the rotation direction of the connecting sleeve 6 is opposite to the rotation direction of the cable.

[0020] A cover plate 31 is rotatably connected to one side of the connecting frame 3, 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, several of the worm wheels 37 are meshed with the corresponding worm 36 respectively, and square grooves 38 are provided inside the several worm wheels 37, a hollow square guide rod 39 is fixedly connected to the top of the connecting sleeve 6, and the hollow square guide rod 39 is slidably connected to the corresponding square groove 38, a bolt is fixedly connected to the top of the connecting frame 3, and a connecting ear is fixedly connected to one end of the cover plate 31, a bolt is passed through the connecting ear, and a nut is threadedly connected to the bolt.

[0021] An L-shaped slide plate 41 is equidistantly slidably connected inside the connecting frame 3, a guide groove 42 is provided inside the L-shaped slide plate 41, a guide sleeve 43 is rotatably connected to the top of the connecting sleeve 6, a shifting post 44 is symmetrically fixedly connected to the outer wall of the guide sleeve 43, an L-shaped slide groove 45 is symmetrically provided inside the guide groove 42, two of the shifting posts 44 are slidably connected to the corresponding L-shaped slide grooves 45 respectively, a cam 46 is equidistantly fixedly connected at the axis of the cover plate 31, a plurality of the outer walls of the cams 46 are fixedly connected with a shifting block 47, and a first return spring 48 is fixedly connected between the L-shaped slide plate 41 and the connecting frame 3.

[0022] One end of the L-shaped slide plate 41 is slidably connected to a trapezoidal push rod 51, a second return spring 52 is installed between the trapezoidal push rod 51 and the L-shaped slide plate 41, and an escape groove 53 is provided at one end of the L-shaped slide plate 41 away from the connecting sleeve 6. The inclined surface of the trapezoidal push rod 51 contacts 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.

[0023] 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, a large gear 63 is fixedly connected to one side of the small gear 62, and an L-shaped large rack 64 is fixedly connected to the top of the support rod 7, 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.

[0024] 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 respectively fixedly connected to a corresponding pair of clamps 8 (i.e., two clamps 8), and the outer wall of the connecting column 91 is provided with a vertical groove 92, and 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 deepens; the inside of the connecting frame 3 is symmetrically and slidably connected with a paddle 94, one side of the paddle 94 is fixedly connected with a buffer rod 95, and the inside of the connecting frame 3 is equidistantly and rotatably connected with a U-shaped paddle 96, and the two ends of the U-shaped paddle 96 are symmetrically provided with buffer grooves 97, and the buffer groove 97 is slidably connected to the buffer rod 95, and the inside of the paddle 94 is slidably connected with a toggle rod 98, and a third return spring 99 is fixedly connected between the toggle rod 98 and the paddle 94.

[0025] This embodiment further provides a photovoltaic grid-connected system, which includes the photovoltaic grid-connected inverter.

[0026] Working principle of a photovoltaic grid-connected inverter: 1. Initial preparation stage: When connecting the photovoltaic inverter for ships to the photovoltaic grid-connected wire, it is necessary to first open the door of the junction box 2, unscrew the nut, and release the restriction on the connection ear, so that the cover plate 31 can be smoothly rotated, and the cover plate 31 and the junction box 2 can be opened to a larger angle to provide sufficient space for subsequent operations. At this time, the connection frame 3 and related components inside the junction box 2 are ready, waiting for the cable to be connected. 2. Initial cable fixing stage: 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 96 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, and when it reaches the connecting 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 to complete 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 return spring 99, so that the elastic force of the third return 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 to fix the cable. 3. Cable processing and support rod 7 preparation stage: The cover plate 31 is rotated, and the rotation of the cover plate 31 drives the driving gear 32 fixed at the connection between the cover plate 31 and the connection frame 3 to rotate. The driving gear 32 is meshed and connected with the driven gear 35 through the transmission gear 33, thereby driving the driven gear 35 to rotate, and then the connecting shaft 34 is rotated. A worm 36 is equidistantly fixed at one end of the connecting shaft 34, and the worm 36 rotates with the rotation of the connecting shaft 34. The worm 36 is meshed with the worm wheel 37, driving the worm wheel 37 to rotate. A square groove 38 is provided inside the worm wheel 37, and a hollow square guide rod 39 fixedly connected to the top of the connecting sleeve 6 slides in the square groove 38. The rotation of the worm wheel 37 drives the hollow square guide rod 39 to rotate through the square groove 38, thereby rotating the connecting sleeve 6. At the same time, the cam 46 fixed at equal distances at the axis of the cover plate 31 will squeeze the L-shaped slide plate 41 during the rotation process, so that the L-shaped slide plate 41 compresses the first return spring 48 and moves downward. A guide groove 42 is provided inside the L-shaped slide plate 41, and the outer wall of the guide sleeve 43 rotatably connected to the top of the connecting sleeve 6 is symmetrically fixed with a lever 44, and the two levers 44 are respectively slidably connected with the L-shaped slide grooves 45 symmetrically provided inside the guide groove 42. When the L-shaped slide plate 41 moves, it will drive the lever 44 on the guide sleeve 43 to slide along the L-shaped slide groove 45, so that the connecting sleeve 6 first descends and then rises.

[0027] Since the rotation direction 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, which is convenient for 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 fixedly connected to it to move, and the small rack 61 meshes 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 is meshed with the L-shaped large rack 64 fixed on 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 that the connecting sleeve 6 rises is one-third of the distance that 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 cable. 4. Final fixing stage of the cable: As the cover plate 31 rotates continuously, the cam 46 fixed on the cover plate 31 continues to drive the L-shaped slide plate 41 to move, and the trapezoidal push rod 51 slidably connected to one end of the L-shaped slide plate 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 barrel-type terminal 5. At this time, the cable is fixed on both sides of 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 vibration environment.

[0028] The above content is a further detailed description of the present invention in combination with a specific preferred embodiment. It cannot be determined 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, several simple deductions or substitutions can be made without departing from the present invention, which should be regarded as belonging to the present invention and the scope of patent protection determined by the submitted claims.

Claims

1. A photovoltaic grid-connected inverter, comprising an inverter body (1), a junction box (2) being installed on one side of the inverter body (1), a connection frame (3) being installed inside the junction box (2), wiring holes (4) being equidistantly provided inside the connection frame (3), and cylindrical wiring terminals (5) being installed inside the wiring holes (4); characterized in that: A connecting sleeve (6) for twisting the cable is installed inside the wiring hole (4); 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 an 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); 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 comprises 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 mounted 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 provided 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. A 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 push rod (72) is fixedly connected to the top end of the piston (10), with one end of the push rod (72) extending out of the support rod (7).

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

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

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

6. A photovoltaic grid-connected inverter according to claim 3, characterized in that: The top end 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 for the bolt to pass through, and the bolt is threadedly connected with a nut.

7. A 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 equidistantly and fixedly connected with strip-shaped anti-slip grooves, 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 meshingly connected to 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), the large gear (63) is meshingly connected to 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 comprises 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 respectively fixedly connected to a 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 equidistantly and symmetrically slidably connected to a paddle (94) inside the connecting frame (3), a buffer rod (95) is fixedly connected to one side of the paddle (94), a U-shaped paddle rod (96) is equidistantly and rotatably connected inside the connecting frame (3), buffer grooves (97) are symmetrically provided at both ends of the U-shaped paddle rod (96), the buffer grooves (97) are slidably connected to the buffer rod (95), a rotating rod (98) is slidably connected to the inside of the paddle (94), and a third return spring (99) is fixedly connected between the rotating rod (98) and the paddle (94).

10. A photovoltaic grid-connected system, characterized in that: It comprises the photovoltaic grid-connected inverter as claimed in any one of claims 1 to 9.

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