Photovoltaic junction box

Abstract

This invention discloses a photovoltaic junction box, belonging to the field of photovoltaic power generation technology. It includes a housing and a cover that fits and snaps into the housing. A busbar and diode are fixedly installed inside the housing. A waterproof connector is installed on the side wall of the housing. A partition is fixedly installed in the inner cavity of the housing, and the partition has holes for cables to pass through. This invention utilizes a tension buffer mechanism, consisting of an upper turntable, a spring, and a lower turntable, located inside the housing near the waterproof connector. Leveraging the energy storage and release characteristics of the spring, when the cable is subjected to instantaneous external force, the turntable rotates to release the pre-stored cable allowance, effectively offsetting the instantaneous impact force generated by the tension and preventing solder joint tearing caused by axial cable movement. Simultaneously, the pre-stored cable allowance can be released in case of insufficient wiring length on-site, improving the product's on-site adaptability and practicality.

Description

Technical Field

[0001] This invention relates to a junction box, and more particularly to a photovoltaic junction box, belonging to the field of photovoltaic power generation technology. Background Technology

[0002] Photovoltaic junction boxes are the core electrical connection and protection components of photovoltaic modules. They are mainly used to realize the electrical conduction of photovoltaic cell busbars, bypass protection, and cable lead-out, and directly determine the operational stability and service life of photovoltaic modules.

[0003] In existing photovoltaic junction boxes, the cable lead-out end relies solely on a waterproof connector for single fixed positioning. When the cable is subjected to external pulling force or mechanical vibration, it is prone to axial movement, causing the solder joints at the connection between the cable and the busbar to tear, which seriously affects the electrical safety and reliability of the junction box. At the same time, existing junction box shells mostly use sheet gaskets to achieve the sealing of the cover. The sheet gaskets have low fit with the mating surface of the shell, affecting the sealing effect.

[0004] To address this issue, a photovoltaic junction box was designed. Summary of the Invention

[0005] The main objective of this invention is to provide a photovoltaic junction box that solves the problems of easy tearing of solder joints under external force and poor sealing effect of the junction box.

[0006] The objective of this invention can be achieved by adopting the following technical solution: A photovoltaic junction box includes a housing, a cover that is adapted to and snapped into the housing, a busbar and a diode are fixedly disposed inside the housing, and a waterproof connector is installed on the side wall of the housing. A partition is fixedly installed in the inner cavity of the housing. The partition has wire holes for cables to pass through. The cables that pass through the waterproof connector into the housing are connected to the busbar after passing through the wire holes. An inflation sealing mechanism is provided between the mating surfaces of the shell and the cover, and the action of the inflation sealing mechanism is linked to the closing action of the cover. A tension buffer mechanism is installed in the inner cavity of the housing near the waterproof connector. The tension buffer mechanism is used to buffer and release the cable when the cable is subjected to external force. The partition is equipped with a reinforcement mechanism that is linked to the closing action of the cover to provide secondary fixation for the cable. The reinforcement mechanism is also linked to the pulling and buffering mechanism to increase the release resistance of the cable during the release process.

[0007] Preferably, the traction buffer mechanism includes an upper turntable, a first limiting plate, a groove, a spring, a second limiting plate, and a prompting component. The upper turntable is rotatably installed at the bottom of the housing. The first limiting plates are symmetrically arranged on the top of the upper turntable. The cable that enters the housing through the waterproof connector deviates from the central axis of the cable hole and the waterproof connector, passes between the two sets of first limiting plates, and then exits from the cable hole. The bottom of the upper turntable has a groove, and a spring is fixedly installed on the inner wall of the groove. The inner end of the spring is connected to the second limiting plate on the housing. The top of the housing cover has a prompting component to indicate the length of the cable release.

[0008] Preferably, the prompting component includes a lower turntable, a positioning groove, an arc-shaped groove, a prompting block, and an indicator arrow. The lower turntable is rotatably mounted on the inner bottom of the cover and is coaxial with the upper turntable. The bottom of the lower turntable has symmetrically provided positioning grooves that cooperate with the first limiting plate. The top of the cover and above the lower turntable has an arc-shaped groove. The top of the lower turntable and within the coverage area of ​​the arc-shaped groove have evenly provided prompting blocks. The top of the cover has an indicator arrow that cooperates with the prompting block.

[0009] Preferably, the reinforcement mechanism includes an upper slot, an upper insert block, a lower slot, a lower insert block, and a lifting component. The upper slot is vertically opened at the top of the partition and communicates with the inside of the wire hole. The upper insert block is vertically slidably arranged inside the upper slot, and the top of the upper insert block extends to the top surface of the partition. The bottom of the partition has a vertically opened lower slot that communicates with the inside of the wire hole. The lower insert block is vertically slidably arranged inside the lower slot. The bottom of the lower insert block is provided with a lifting component, and the lifting component is linked to the rotation of the upper turntable.

[0010] Preferably, the lifting component includes a vertical groove, a guide block, and a guide channel. The vertical groove is vertically opened on the side of the partition and is connected to the interior of the lower slot. The guide block is vertically slidably arranged inside the vertical groove and is fixedly connected to the lower insertion block. A guide channel is opened on the outer peripheral surface of the upper turntable, and the end of the guide block away from the lower insertion block slides inside the guide channel.

[0011] Preferably, the bottom end of the upper plug and the top end of the lower plug are both arc-shaped surfaces, and the radius of curvature of the arc-shaped surfaces is adapted to the outer diameter of the cable.

[0012] Preferably, the inflatable sealing mechanism includes an inflatable sealing ring, a cylinder, a first piston, a pressure rod, and a pressure stabilizing component. The inflatable sealing ring is sleeved on the outer side of the mating surface at the top of the housing. The cylinder is fixed to the inner bottom of the inflatable sealing ring. The inner cavity of the inflatable sealing ring is in communication with the inner cavity of the cylinder. The first piston is vertically slidably mounted on the inner top of the cylinder. A pressure rod is fixed on the top of the first piston and extends to the outer side of the top of the cylinder. A pressure stabilizing component is provided at the bottom of the cylinder.

[0013] Preferably, the voltage stabilizing assembly includes a second piston, a return spring, and a vent hole. The second piston is slidably disposed at the bottom of the cylinder body. A return spring is provided between the bottom of the second piston and the bottom of the cylinder body. A vent hole communicating with the inside of the cylinder body is provided at the bottom of the outer side of the cylinder body.

[0014] Preferably, a limiting groove is provided at the middle position of the side of the partition, a locking block is provided on the inner side of the limiting groove, and a locking groove that cooperates with the locking block is provided on the outer side of the cylinder body.

[0015] Preferably, the central axis of the wire hole is coaxial with the central axis of the wire hole of the waterproof connector, and the traction buffer mechanism is located between the waterproof connector and the partition.

[0016] The beneficial effects of this invention are as follows: The present invention provides a photovoltaic junction box, which has a tension buffer mechanism consisting of an upper turntable, a spring, and a lower turntable installed inside the housing near the waterproof connector. By utilizing the energy storage and release characteristics of the spring, when the cable is pulled by an instantaneous external force, the turntable can rotate to release the pre-stored cable allowance, effectively offsetting the instantaneous impact force generated by the pull and avoiding the problem of solder joint tearing caused by axial movement of the cable. At the same time, the pre-stored cable allowance can be released in an emergency when the wiring length is insufficient on site, improving the on-site adaptability and practicality of the product. By providing a reinforcement mechanism consisting of an upper slot, an upper insert block, a lower slot, a lower insert block, a vertical groove, a guide block, and a guide groove at the partition, the cable achieves dual positioning protection and anti-over-release function. This mechanism is linked to the closing action of the cover. When the cover closes, it drives the upper insert block to move downward, forming a secondary compression positioning on the cable and enhancing the cable's anti-tension performance after installation. At the same time, it works in conjunction with the tension buffer mechanism. When the upper turntable rotates to release the cable, it simultaneously drives the bottom lower insert block to move upward, increasing the cable's sliding resistance during the release process. This effectively avoids internal connection failure caused by excessive cable release and further improves the structural stability of the connection between the cable and the busbar. An inflatable sealing mechanism consisting of an inflatable sealing ring, a cylinder, a first piston, a pressure rod, a second piston, and a return spring is provided between the housing and the cover. This mechanism is triggered synchronously with the closing action of the cover. When the cover is closed, the pressure rod and the piston assembly generate a compression displacement, automatically filling the inflatable sealing ring with compressed gas. This causes the inflatable sealing ring to expand and form a tight fit with the mating surfaces of the housing and the cover, effectively eliminating the assembly gaps between the mating surfaces and significantly improving the overall sealing effect of the junction box. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the main structure of the present invention; Figure 2 This is a top view of the interior of the housing of the present invention; Figure 3 This is a schematic side sectional view of the entire invention; Figure 4 This is a schematic diagram of the internal side section of the housing of the present invention; Figure 5 This is a schematic diagram of the tension buffer mechanism of the present invention; Figure 6 This is a bottom view of the upper turntable of the present invention; Figure 7 This is a schematic diagram of the bottom of the shell cover of the present invention; Figure 8 This is a schematic diagram of the reinforcement mechanism of the present invention; Figure 9 This is a front view schematic diagram of the air-filled sealing mechanism of the present invention; Figure 10 This is a side view schematic diagram of the air-filled sealing mechanism of the present invention.

[0018] In the diagram: 1. Housing; 101. Busbar; 102. Diode; 2. Waterproof connector; 3. Shell cover; 4. Inflatable sealing mechanism; 401. Inflatable sealing ring; 402. Cylinder body; 403. First piston; 404. Pressure rod; 405. Second piston; 406. Return spring; 407. Vent hole; 5. Partition; 501. Limiting groove; 502. Locking block; 503. Locking slot; 6. Wire hole; 7. Pull-out buffer mechanism; 701. Upper turntable; 702. First limiting plate; 703. Groove; 704. Spring; 705. Second limiting plate; 706. Lower turntable; 707. Positioning groove; 708. Arc groove; 709. Indicator block; 710. Indicator arrow; 8. Reinforcing mechanism; 801. Upper slot; 802. Upper insert block; 803. Lower slot; 804. Lower insert block; 805. Vertical slot; 806. Guide block; 807. Guide groove. Detailed Implementation

[0019] To enable those skilled in the art to more clearly understand the technical solution of the present invention, the present invention will be further described in detail below with reference to embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0020] Example 1 like Figures 1-10As shown, this embodiment provides a photovoltaic junction box, including a housing 1 and a cover 3 that fits and snaps into the housing 1. The housing 1 is an insulated cavity structure with an open top. Busbars 101 and diodes 102 are fixedly installed inside the housing 1. The two pins of the diodes 102 are welded and fixed to two adjacent sets of busbars 101 respectively, forming a bypass protection circuit for the photovoltaic module. A cable insertion hole is opened on the side wall of the housing 1. A waterproof connector 2 is sealed and installed at the cable insertion hole. The waterproof connector 2 adopts a cable gland structure and is used to radially seal and initially fix the inserted cable.

[0021] A partition 5 is fixedly installed in the inner cavity of the housing 1. The partition 5 is set perpendicular to the direction of cable entry and divides the inner cavity of the housing 1 into a wiring buffer cavity and an electrical installation cavity. The waterproof connector 2 is connected to the wiring buffer cavity, and the busbar 101 and diode 102 are both set in the electrical installation cavity. The partition 5 has a wire hole 6 for the cable to pass through. The wire hole 6 is a circular through hole. After the cable passes through the waterproof connector 2 into the housing 1 and passes through the wire hole 6, the conductor core of the cable is welded and fixed to the busbar 101 to achieve electrical conduction.

[0022] An inflation sealing mechanism 4 is provided between the mating surfaces of the housing 1 and the cover 3. The action of the inflation sealing mechanism 4 is linked to the closing action of the cover 3. During the process of the cover 3 and the housing 1 being fastened together, the inflation sealing mechanism 4 is synchronously driven to complete the inflation expansion, forming a full circumferential seal between the mating surfaces of the housing 1 and the cover 3.

[0023] A tension buffer mechanism 7 is provided in the inner cavity of the housing 1 near the waterproof connector 2. The tension buffer mechanism 7 is located in the wiring buffer cavity between the waterproof connector 2 and the partition 5. The tension buffer mechanism 7 is used to buffer and release the axial displacement of the cable when the cable is subjected to external force, to offset the tension impact force, and to prevent the tension force from being directly transmitted to the welding part of the cable and the busbar 101, so as to prevent the solder joint from tearing and failing.

[0024] The partition 5 is equipped with a reinforcement mechanism 8, which is linked to the closing action of the cover 3. After the cover 3 is closed, the reinforcement mechanism 8 performs secondary fixation on the cable passing through the wire hole 6 to enhance the cable's tensile strength. At the same time, the reinforcement mechanism 8 is also linked with the tension buffer mechanism 7 to increase the release resistance of the cable during the cable's release process, preventing the internal wiring from loosening due to excessive release of the cable.

[0025] Example 2 The solution in Example 1 will be further described below with reference to its specific working method. In this embodiment, the tension buffer mechanism 7 includes an upper turntable 701, a first limiting plate 702, a groove 703, a spring 704, a second limiting plate 705, and a prompting component. The upper turntable 701 is rotatably installed on the inner bottom of the housing 1. The top of the upper turntable 701 is symmetrically provided with first limiting plates 702. A cable limiting channel is formed between the two sets of first limiting plates 702. The cable entering the housing 1 through the waterproof connector 2 deviates from the central axis of the wire hole 6 and the waterproof connector 2, passes between the two sets of first limiting plates 702, and then passes out from the wire hole 6, so that the cable bends at the upper turntable 701 and stores cable slack for buffering. The bottom of the upper turntable 701 is provided with a groove 703, which is a circular blind groove. A spring 704 is fixedly installed on the inner wall of the groove 703. The outer end of the spring 704 is fixedly connected to the inner side wall of the groove 703. The inner end of the spring 704 is connected to the second limiting plate 705 on the housing 1. The top of the housing cover 3 is provided with a prompting component to indicate the length of the cable release.

[0026] In this embodiment, the prompting component includes a lower turntable 706, a positioning groove 707, an arc-shaped groove 708, a prompting block 709, and an indicator arrow 710. The lower turntable 706 is rotatably mounted on the inner bottom of the cover 3, and the lower turntable 706 is coaxial with the upper turntable 701. The bottom of the lower turntable 706 is symmetrically provided with positioning grooves 707 that cooperate with the first limiting plate 702. The shape and position of the positioning grooves 707 are adapted to the first limiting plate 702. When the cover 3 and the housing 1 are closed in place, the first limiting plate 702 is engaged in the positioning grooves 707, so that the lower turntable 706 and the upper turntable 701 form a synchronous rotation linkage.

[0027] An arc-shaped groove 708 is provided on the top of the cover 3 above the lower turntable 706. The arc-shaped groove 708 is a transparent and visible groove, and the center of the arc-shaped groove 708 coincides with the rotation center of the lower turntable 706. Indicator blocks 709 are evenly distributed on the top of the lower turntable 706 within the coverage area of ​​the arc-shaped groove 708. The indicator blocks 709 are marked with scale markings corresponding to the cable release length. An indicator arrow 710 is provided on the top of the cover 3 to cooperate with the indicator blocks 709. The tip of the indicator arrow 710 points to the range of the arc-shaped groove 708 to indicate the scale corresponding to the current indicator block 709, so as to realize the visual indication of the cable being pulled.

[0028] In this embodiment, the reinforcement mechanism 8 includes an upper slot 801, an upper insert block 802, a lower slot 803, a lower insert block 804, and a lifting assembly. The upper slot 801 is vertically opened on the top of the partition 5 and communicates with the inside of the wire hole 6. The upper insert block 802 is vertically slidably disposed inside the upper slot 801, and the top end of the upper insert block 802 extends above the top surface of the partition 5, while the bottom end of the upper insert block 802 extends into the inner cavity of the wire hole 6. When the cover 3 is closed, the inner bottom surface of the cover 3 presses down on the top end of the upper insert block 802, driving the upper insert block 802 to slide downward along the upper slot 801, forming a squeezing clamp on the cable and completing the secondary fixation.

[0029] The bottom of the partition 5 is vertically provided with a lower slot 803 that communicates with the inside of the wire hole 6, and the lower slot 803 is coaxially opposite to the upper slot 801; a lower insertion block 804 is vertically slidably arranged inside the lower slot 803, the top of the lower insertion block 804 extends into the inner cavity of the wire hole 6, and the bottom of the lower insertion block 804 is provided with a lifting component, which is linked to the rotation of the upper turntable 701. When the upper turntable 701 rotates to release the cable, it drives the lower insertion block 804 to slide upward, thereby increasing the clamping resistance on the cable.

[0030] In this embodiment, the lifting component includes a vertical groove 805, a guide block 806, and a guide channel 807. The vertical groove 805 is vertically opened on the side wall of the partition 5 near the upper turntable 701, and the vertical groove 805 is in communication with the interior of the lower slot 803. The guide block 806 is vertically slidably disposed inside the vertical groove 805. One end of the guide block 806 extends into the lower slot 803 and is fixedly connected to the side wall of the lower insert block 804. The other end of the guide block 806 extends toward the direction near the upper turntable 701.

[0031] A guide groove 807 is provided on the outer circumferential surface of the upper turntable 701. The guide groove 807 is a variable diameter arc groove opened along the circumference of the upper turntable 701. The distance between the bottom of the groove and the center of the upper turntable 701 gradually changes along the rotation direction. The end of the guide block 806 away from the lower insertion block 804 slides inside the guide groove 807. When the upper turntable 701 rotates with the cable, the inner wall of the guide groove 807 forms a lifting force on the guide block 806, driving the guide block 806 to slide upward along the vertical groove 805, thereby driving the lower insertion block 804 to move upward synchronously, realizing the conversion of rotational action to linear lifting action.

[0032] In this embodiment, the bottom end of the upper insertion block 802 and the top end of the lower insertion block 804 are both arc-shaped surfaces, and the radius of curvature of the arc-shaped surfaces is adapted to the outer diameter of the cable, so that the upper insertion block 802 and the lower insertion block 804 form a surface contact fit with the insulation outer wall of the cable, which not only improves the clamping and fixing effect, but also avoids excessive local pressure from damaging the cable insulation sheath, thus ensuring the insulation protection performance of the cable.

[0033] In this embodiment, the inflation sealing mechanism 4 includes an inflation sealing ring 401, a cylinder 402, a first piston 403, a pressure rod 404, and a pressure stabilizing component. The inflation sealing ring 401 is an annular elastic sealing ring, which is sleeved on the outer side of the top mating surface of the housing 1. An annular inflation chamber is provided inside the inflation sealing ring 401. The cylinder 402 is fixed to the inner bottom of the inflation sealing ring 401. A compression chamber is provided inside the cylinder 402. The annular inflation chamber of the inflation sealing ring 401 and the compression chamber of the cylinder 402 are interconnected.

[0034] A first piston 403 is vertically slidably mounted on the inner top of the cylinder 402. The outer side wall of the first piston 403 is in a sealing sliding fit with the inner side wall of the cylinder 402. A pressure rod 404 is fixed at the center of the top of the first piston 403. The top of the pressure rod 404 extends upward to the outer side of the top of the cylinder 402. When the cover 3 is closed, the inner bottom surface of the cover 3 presses down on the pressure rod 404, causing the first piston 403 to slide downward, compressing the air in the cylinder 402 and filling it into the annular inflation chamber of the inflation seal ring 401, driving the inflation seal ring 401 to expand. A pressure stabilizing component is provided at the bottom of the cylinder 402 to control the inflation pressure and prevent over-inflation from damaging the inflation seal ring 401.

[0035] In this embodiment, the voltage stabilizing assembly includes a second piston 405, a return spring 406, and a vent 407. The second piston 405 is slidably disposed at the inner bottom of the cylinder 402. A return spring 406 is provided between the bottom of the second piston 405 and the inner bottom of the cylinder 402. The two ends of the return spring 406 are fixedly connected to the bottom surface of the second piston 405 and the inner bottom surface of the cylinder 402, respectively.

[0036] A vent hole 407 communicating with the inside of the cylinder 402 is provided at the bottom of the outer side of the cylinder 402. In the initial state, the second piston 405 is located above the vent hole 407. When the air pressure inside the cylinder 402 is too high, the air pressure will push the second piston 405 downward to compress the return spring 406. When the air sealing ring 401 is used for a long time or the air pressure is insufficient due to weather, the return spring 406 pushes the second piston 405 upward to replenish the air sealing ring 401 with gas, ensuring that the inside of the air sealing ring 401 is full.

[0037] In this embodiment, a limiting groove 501 is provided at the middle position of the side of the partition 5. The opening of the limiting groove 501 is set towards the cylinder body 402. A locking block 502 is provided on the inner side of the limiting groove 501. A locking groove 503 that cooperates with the locking block 502 is provided on the outer side of the cylinder body 402. During assembly, the side of the cylinder body 402 is inserted into the limiting groove 501, and the locking block 502 is locked into the locking groove 503. This not only achieves auxiliary positioning and fixation of the cylinder body 402, preventing the cylinder body 402 from shifting during the repeated opening and closing of the cover 3, but also improves the installation structure strength of the partition 5, preventing the partition 5 from shaking and deforming under the force.

[0038] In this embodiment, the central axis of the wire hole 6 is coaxial with the central axis of the wire hole of the waterproof connector 2, and the traction buffer mechanism 7 is located between the waterproof connector 2 and the partition 5.

[0039] The solutions in Embodiment 1 and Embodiment 2 will be further described below with reference to their specific working methods. During assembly and wiring, the inflatable sealing ring 401 is fitted onto the outer side of the top mating surface of the housing 1, and the cylinder 402 is inserted into the limiting groove 501 on the side of the partition 5, so that the locking block 502 engages with the locking groove 503 to complete the pre-assembly of the inflatable sealing mechanism 4.

[0040] The end of the cable is inserted into the wiring buffer cavity of the housing 1 through the waterproof connector 2. The cable is then passed through the limiting channel between the two sets of first limiting plates 702 at the top of the upper turntable 701. The cable is then passed through the wire hole 6 on the partition 5. Finally, the conductor core of the cable is welded and fixed to the busbar 101 to complete the electrical connection. At this time, the cable is bent at the upper turntable 701, with a pre-stored buffer margin, and the spring 704 is in its initial natural state.

[0041] The cover 3 is aligned and fastened to the housing 1. During the fastening process, the inner bottom surface of the cover 3 simultaneously contacts the top of the pressure rod 404 and the top of the upper insertion block 802. As the cover 3 is pressed down and closed, the pressure rod 404 drives the first piston 403 to slide down, compressing the air in the cylinder 402 and filling the air-filled sealing ring 401, causing the air-filled sealing ring 401 to expand and form a full circumferential seal between the mating surfaces of the housing 1 and the cover 3. At the same time, the cover 3 presses down on the upper insertion block 802, causing the upper insertion block 802 to slide down along the upper slot 801, and its bottom arc-shaped surface presses against the outer wall of the cable, completing the secondary fixation of the cable.

[0042] After the cover 3 is closed, the positioning groove 707 at the bottom of the lower turntable 706 is aligned and engaged with the first limiting plate 702 at the top of the upper turntable 701, so that the lower turntable 706 and the upper turntable 701 form a synchronous rotation linkage relationship, and the overall assembly is completed.

[0043] During normal use, when the photovoltaic module is working, the current is output to the outside through the busbar 101 and the cable. The diode 102 realizes bypass protection when the module has a hot spot fault. The gas-filled sealing mechanism 4 continuously maintains the expansion and sealing state to prevent external moisture and dust from entering the housing 1. The upper insertion block 802 of the reinforcement mechanism 8 continuously clamps and fixes the cable to prevent the cable from axial movement caused by wind vibration and mechanical vibration at the photovoltaic power station site.

[0044] When the cable is subjected to an unexpected external pulling force, the axial tension of the cable drives the upper turntable 701 to rotate through the first limit plate 702. During the rotation of the upper turntable 701, the pre-stored cable allowance is released to offset the axial pulling displacement of the cable and prevent the tension from being directly transmitted to the welding joint between the cable and the busbar 101, thus preventing the welding joint from tearing and failing from the root. At the same time as the upper turntable 701 rotates, it drives the spring 704 to deform and store energy, providing power for subsequent reset.

[0045] During the process of the upper turntable 701 rotating to release the cable, the guide groove 807 on its outer periphery rotates synchronously. The inner wall of the guide groove 807 lifts the guide block 806, causing the guide block 806 to slide upward along the vertical groove 805, which in turn drives the lower insertion block 804 to slide upward along the lower slot 803. The arc-shaped surface at the top of the lower insertion block 804 presses against the bottom of the cable, cooperating with the upper insertion block 802 to increase the clamping resistance on the cable. Moreover, the greater the rotation angle of the upper turntable 701, the higher the lifting height of the lower insertion block 804, and the greater the clamping resistance, forming an anti-dislodgement resistance that increases with the release amount, effectively preventing the cable from being excessively released.

[0046] As the upper turntable 701 rotates, the lower turntable 706 rotates synchronously through the engagement of the first limiting plate 702 and the positioning groove 707. The indicator block 709 on the top of the lower turntable 706 rotates with the lower turntable 706. Through the arc-shaped groove 708 and the indicator arrow 710 on the top of the cover 3, maintenance personnel can intuitively read the release length of the cable, quickly determine whether the junction box has been subjected to excessive external force, and carry out timely inspection and maintenance.

[0047] When the external pulling force disappears, the spring 704 releases its elastic potential energy, causing the upper turntable 701 to rotate in the opposite direction and reset, rewinding the cable and restoring the pre-stored buffer margin. At the same time, as the upper turntable 701 rotates in the opposite direction, the guide groove 807 causes the guide block 806 and the lower insertion block 804 to slide down and reset, releasing the additional clamping resistance on the cable. Simultaneously, the upper turntable 701 causes the lower turntable 706 to rotate in the opposite direction, causing the indicator block 709 to reset to its initial position.

[0048] When the cover 3 is closed for inflation, if the air pressure inside the cylinder 402 is too high, the air pressure pushes the second piston 405 downward to compress the return spring 406. When the inflation seal ring 401 has been used for a long time or the air pressure is insufficient due to weather conditions, the return spring 406 pushes the second piston 405 upward to replenish the gas in the inflation seal ring 401, ensuring that the inside of the inflation seal ring 401 is fully filled. When the cover 3 is opened, the downward pressure of the first piston 403 disappears, the high-pressure gas in the inflation seal ring 401 flows back, pushing the first piston 403 and the pressure rod 404 upward to reset, the inflation seal ring 401 contracts and releases the seal, and at the same time the return spring 406 pushes the second piston 405 upward to reset, preparing for the next closing inflation.

[0049] The above description is merely a further embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope disclosed in the present invention, based on the technical solution and concept of the present invention, shall fall within the scope of protection of the present invention.

Claims

1. A photovoltaic junction box, comprising a housing (1) and a cover (3) adapted to and fastened to the housing (1), wherein a busbar (101) and a diode (102) are fixedly disposed inside the housing (1), and a waterproof connector (2) is installed on the side wall of the housing (1). Its features are: A partition (5) is fixedly installed in the inner cavity of the housing (1). A wire hole (6) is provided on the partition (5) for the cable to pass through. The cable that passes through the waterproof connector (2) into the housing (1) passes through the wire hole (6) and is electrically connected to the busbar (101). An inflation sealing mechanism (4) is provided between the mating surfaces of the shell (1) and the shell cover (3), and the action of the inflation sealing mechanism (4) is linked to the closing action of the shell cover (3). A tension buffer mechanism (7) is provided in the inner cavity of the housing (1) near the waterproof connector (2). The tension buffer mechanism (7) is used to buffer and release the cable when the cable is subjected to external force. A reinforcing mechanism (8) is provided on the partition (5). The reinforcing mechanism (8) is linked with the closing action of the cover (3) to fix the cable for a second time. The reinforcing mechanism (8) is also linked with the pulling buffer mechanism (7) to increase the release resistance of the cable during the release process.

2. A photovoltaic junction box according to claim 1, characterized in that: The traction buffer mechanism (7) includes an upper turntable (701), a first limiting plate (702), a groove (703), a spring (704), a second limiting plate (705), and a prompting component. The upper turntable (701) is rotatably installed on the inner bottom of the housing (1). The first limiting plate (702) is symmetrically arranged on the top of the upper turntable (701). The cable that enters the housing (1) through the waterproof connector (2) deviates from the central axis of the wire hole (6) and the waterproof connector (2), passes between the two sets of first limiting plates (702), and then exits from the wire hole (6). The bottom of the upper turntable (701) is provided with a groove (703), and a spring (704) is fixedly installed on the inner wall of the groove (703). The inner end of the spring (704) is connected to the second limiting plate (705) on the housing (1). The top of the cover (3) is provided with a prompting component to display the length of the cable release.

3. A photovoltaic junction box according to claim 2, characterized in that: The prompting component includes a lower turntable (706), a positioning groove (707), an arc groove (708), a prompting block (709), and an indicator arrow (710). The lower turntable (706) is rotatably mounted on the inner bottom of the cover (3), and the lower turntable (706) is coaxial with the upper turntable (701). The bottom of the lower turntable (706) is symmetrically provided with positioning grooves (707) that cooperate with the first limiting plate (702). The top of the cover (3) and above the lower turntable (706) is provided with an arc groove (708). The top of the lower turntable (706) and within the coverage area of ​​the arc groove (708) are provided with prompting blocks (709). The top of the cover (3) is provided with an indicator arrow (710) that cooperates with the prompting block (709).

4. A photovoltaic junction box according to claim 2, characterized in that: The reinforcement mechanism (8) includes an upper slot (801), an upper insert (802), a lower slot (803), a lower insert (804), and a lifting component. The upper slot (801) is vertically opened on the top of the partition (5) and communicates with the inside of the wire hole (6). The upper insert (802) is vertically slidably arranged inside the upper slot (801), and the top of the upper insert (802) extends to the top surface of the partition (5). The bottom of the partition (5) is vertically opened with a lower slot (803) communicating with the inside of the wire hole (6). The lower insert (804) is vertically slidably arranged inside the lower slot (803). The bottom of the lower insert (804) is provided with a lifting component, and the lifting component is linked to the rotation of the upper turntable (701).

5. A photovoltaic junction box according to claim 4, characterized in that: The lifting assembly includes a vertical groove (805), a guide block (806), and a guide channel (807). The vertical groove (805) is vertically opened on the side of the partition (5), and the vertical groove (805) is connected to the interior of the lower slot (803). The guide block (806) is vertically slidably arranged inside the vertical groove (805), and the guide block (806) is fixedly connected to the lower insert block (804). The guide channel (807) is opened on the outer peripheral surface of the upper turntable (701), and the end of the guide block (806) away from the lower insert block (804) slides inside the guide channel (807).

6. A photovoltaic junction box according to claim 4, characterized in that: The bottom of the upper plug (802) and the top of the lower plug (804) are both arc-shaped surfaces, and the radius of curvature of the arc-shaped surfaces is adapted to the outer diameter of the cable.

7. A photovoltaic junction box according to claim 1, characterized in that: The inflation sealing mechanism (4) includes an inflation sealing ring (401), a cylinder (402), a first piston (403), a pressure rod (404), and a pressure stabilizing component. The inflation sealing ring (401) is sleeved on the outer side of the top mating surface of the housing (1). The cylinder (402) is fixed to the inner bottom of the inflation sealing ring (401). The inner cavity of the inflation sealing ring (401) is connected to the inner cavity of the cylinder (402). The first piston (403) is vertically slidably arranged on the inner top of the cylinder (402). The pressure rod (404) is fixed on the top of the first piston (403), and the pressure rod (404) extends to the outer side of the top of the cylinder (402). The pressure stabilizing component is provided at the bottom of the cylinder (402).

8. A photovoltaic junction box according to claim 7, characterized in that: The voltage stabilizing assembly includes a second piston (405), a return spring (406), and a vent hole (407). The second piston (405) is slidably disposed at the inner bottom of the cylinder (402). The return spring (406) is provided between the bottom of the second piston (405) and the inner bottom of the cylinder (402). A vent hole (407) communicating with the inside of the cylinder (402) is provided at the bottom of the outer side of the cylinder (402).

9. A photovoltaic junction box according to claim 7, characterized in that: A limiting groove (501) is provided at the middle position of the side of the partition (5), and a locking block (502) is provided on the inner side of the limiting groove (501). A locking groove (503) that cooperates with the locking block (502) is provided on the outer side of the cylinder (402).

10. A photovoltaic junction box according to claim 1, characterized in that: The central axis of the wire hole (6) is coaxial with the central axis of the wire hole of the waterproof connector (2), and the traction buffer mechanism (7) is located between the waterproof connector (2) and the partition (5).

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