Photovoltaic power-off protection device

Abstract

The invention provides a photovoltaic power-off protection device, and the device comprises a housing which is provided with an accommodation cavity; the power connection assembly comprises a first contact piece and a second contact piece which are arranged in the containing cavity, the first contact piece and / or the second contact piece are / is movably arranged relative to the shell, the power connection assembly has a power connection state and a power failure state, when the power connection assembly is in the power connection state, the first contact piece makes contact with the second contact piece, and when the power connection assembly is in the power failure state, the first contact piece makes contact with the second contact piece. The first contact piece is separated from the second contact piece; and the thermosensitive elastic piece is arranged in the containing cavity, the thermosensitive elastic piece can drive the power connection assembly, and when the temperature of the thermosensitive elastic piece is larger than or equal to a safety threshold value, the thermosensitive elastic piece expands and deforms so as to drive the power connection assembly to be switched from the power connection state to the power-off state. Through the technical scheme provided by the invention, the problem that photovoltaic power-off protection depends on an external temperature control system in the prior art can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic circuit equipment, and in particular to a photovoltaic power failure protection device. Background Art

[0002] With the rapid development of photovoltaic power generation technology, photovoltaic systems have been widely used in various power generation scenarios. However, during the operation of photovoltaic systems, especially under extreme conditions such as high temperature and strong light, the temperature of photovoltaic system components tends to rise rapidly, which may cause damage to photovoltaic system equipment or reduced efficiency, or even cause safety hazards such as fire. Therefore, how to quickly achieve safe power-off protection when the temperature of the photovoltaic system is abnormal has become an urgent problem to be solved in the design of photovoltaic systems.

[0003] In the related art, photovoltaic power-off protection adopts an external temperature control system, which uses a temperature sensor to detect the operating temperature of the photovoltaic system, and the electrical control circuit issues a power-off command based on the detection result of the temperature sensor.

[0004] However, the photovoltaic power-off protection in the related art relies on an external temperature control system. Once the external temperature control system fails or the power is cut off, the power-off protection function will not function normally. Summary of the invention

[0005] The present invention provides a photovoltaic power failure protection device to solve the problem in the related art that photovoltaic power failure protection depends on an external temperature control system.

[0006] The present invention provides a photovoltaic power-off protection device, which comprises: a shell having a accommodating cavity; a power connection component, comprising a first contact and a second contact arranged in the accommodating cavity, the first contact and / or the second contact being movably arranged relative to the shell, the power connection component having a power-on state and a power-off state, when the power connection component is in the power-on state, the first contact and the second contact are in contact with each other, and when the power connection component is in the power-off state, the first contact and the second contact are separated; a thermosensitive elastic component, which is arranged in the accommodating cavity, the thermosensitive elastic component can drive the power connection component, and when the temperature of the thermosensitive elastic component is greater than or equal to a safety threshold, the thermosensitive elastic component expands and deforms to drive the power connection component to switch from the power-on state to the power-off state.

[0007] Furthermore, the first contact and the second contact are arranged in the width direction of the shell, and the first contact and the second contact are both swingably set on the shell, the swing axis of the first contact is perpendicular to the width direction of the shell, and the swing axis of the first contact is parallel to the swing axis of the second contact.

[0008] Furthermore, the thermosensitive elastic member includes: a limiting tube, which is arranged in the accommodating cavity, and the axis of the limiting tube is arranged at an angle to the swing axis of the first contact; a movable frame, which is movably arranged on the limiting tube along the axial direction of the limiting tube, and the movable frame has a locking groove, and the groove depth direction of the locking groove is parallel to the axial direction of the limiting tube, and the first contact and the second contact extend into the locking groove; a thermosensitive spring, which is arranged in the limiting tube, and the end of the thermosensitive spring facing away from the power connection component is connected to the limiting tube, and the end of the thermosensitive spring facing the power connection component is connected to the movable frame, and when the temperature of the thermosensitive elastic member is greater than or equal to the safety threshold, the thermosensitive spring expands and deforms, and the groove bottom of the locking groove abuts against the first contact and the second contact respectively to separate the first contact and the second contact.

[0009] Furthermore, the thermal spring may be made of any one of nickel-titanium alloy, copper-based shape memory alloy or manganese-copper alloy; and / or, the limiting tube is provided with a plurality of through grooves.

[0010] Furthermore, a plurality of heat dissipation openings are provided on the shell, and the photovoltaic power-off protection device also includes: a cleaning member, which is movably arranged at the heat dissipation opening; a driving member, which is drivingly connected to the cleaning member to drive the cleaning member to clean the heat dissipation opening; a temperature control member, which is arranged in the accommodating cavity, and the temperature control member is signal-connected to the driving member, and when the detection result of the temperature control member is greater than or equal to the safety threshold, the temperature control member starts the driving member.

[0011] Furthermore, the heat dissipation opening adopts a strip structure extending along the length direction of the shell, a guide rod is arranged in the shell, the guide rod extends along the length direction of the shell, the cleaning piece is movably mounted on the guide rod along the extension direction of the guide rod, the driving piece includes a driving motor and a first reciprocating screw, the driving motor is arranged in the accommodating chamber, the first reciprocating screw is rotatably arranged in the accommodating chamber around its axis, the first reciprocating screw extends along the length direction of the shell, the first reciprocating screw is penetrated by the cleaning piece and is drivingly connected to the cleaning piece, the driving motor is drivingly connected to the first reciprocating screw to drive the cleaning piece to reciprocate along the length direction of the shell, and the temperature control unit is signal-connected to the driving motor; and / or, the cleaning piece includes a movable plate and a cleaning brush, the driving piece is drivingly connected to the movable plate to drive the movable plate to reciprocate along the length direction of the shell, the cleaning brush is arranged on the side of the movable plate facing the heat dissipation opening, and the cleaning brush is movably extended into the heat dissipation opening along the length direction of the shell.

[0012] Furthermore, the photovoltaic power-off protection device also includes a ventilation member, which includes: a connecting rod, which is movably arranged on the shell along the length direction of the shell, the extension direction of the connecting rod is arranged at an angle with the length direction of the shell, and the driving member is connected to the connecting rod to drive the connecting rod to reciprocate along the length direction of the shell; two wind shields are respectively arranged at both ends of the connecting rod, and two ventilation holes are arranged on the shell, and the two ventilation holes are respectively arranged opposite to the two wind shields. The ventilation member has a ventilation position and a protection position. When the ventilation member is in the ventilation position, the two wind shields respectively open the two ventilation holes, and when the ventilation member is in the protection position, the two wind shields respectively close the two ventilation holes.

[0013] Furthermore, the driving member includes: a driving motor; a cam, which is rotatably arranged in the accommodating chamber, the rotation axis of the cam extends along the length direction of the shell, and the driving motor is connected to the cam; a swing frame, the middle part of the swing frame is hinged to the shell, the hinge axis of the swing frame is parallel to the rotation axis of the cam, and the cam is slidably matched with one end of the swing frame to drive the swing frame to swing; a pawl, which is rotatably arranged at the other end of the swing frame; a ratchet, which is rotatably arranged in the accommodating chamber, the rotation axis of the ratchet is parallel to the rotation axis of the cam, and the pawl can engage with the ratchet to drive the ratchet to rotate; a second reciprocating screw, which is rotatably arranged in the accommodating chamber around its axis, the second reciprocating screw extends along the length direction of the shell, the ratchet is sleeved on the second reciprocating screw and connected to the second reciprocating screw, and the second reciprocating screw is penetrated through the connecting rod and is connected to the connecting rod.

[0014] Furthermore, the power connection assembly further includes a first power connection piece and a second power connection piece, both of which are disposed through the housing, the first contact piece is conductively connected to the first power connection piece, and the second contact piece is conductively connected to the second power connection piece.

[0015] Further, the shell includes a lower shell, an upper shell and a quick-release part, the lower shell and the upper shell are arranged to form a accommodating cavity, the lower shell and the upper shell are connected by a quick-release part, the shell includes two quick-release parts, and the two quick-release parts are relatively arranged on both sides of the upper shell in the width direction of the shell; and / or, the quick-release part includes a mounting seat and a buckle, the mounting seat is arranged on the upper shell, the buckle is swingably arranged on the mounting seat, and a slot is arranged on the outer side wall of the lower shell, and the buckle has a hook that can be engaged with the slot.

[0016] By applying the technical solution of the present invention, a photovoltaic power-off protection device includes a shell, a power connection component and a thermosensitive elastic member. Affected by the temperature of the accommodating cavity, when the temperature of the thermosensitive elastic member is lower than the safety threshold, the thermosensitive elastic member is in an initial contracted state, and the first contact and the second contact are in contact, ensuring normal power-on of the circuit. When the temperature of the thermosensitive elastic member is greater than or equal to the safety threshold, the thermosensitive elastic member expands and deforms to drive the power connection component to switch from the power-on state to the power-off state, thereby realizing automatic disconnection of the circuit. This design realizes the temperature-triggered automatic power-off protection function without the need for external manual operation or complex control systems, thereby improving the safety and reliability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 A schematic diagram of the structure of a photovoltaic power failure protection device provided in an embodiment of the present invention is shown;

[0019] Figure 2 A schematic structural diagram of an upper housing, a first power connection member and a second power connection member of a photovoltaic power failure protection device provided in an embodiment of the present invention is shown;

[0020] Figure 3 Shows Figure 2 A partial enlarged view of the middle A;

[0021] Figure 4 A schematic structural diagram of a thermal-sensitive elastic member of a photovoltaic power-off protection device provided in accordance with an embodiment of the present invention is shown;

[0022] Figure 5 A schematic structural diagram of a lower housing of a photovoltaic power failure protection device provided according to an embodiment of the present invention is shown;

[0023] Figure 6 A schematic structural diagram of a lower housing, a driving component, a cleaning component and a ventilation component of a photovoltaic power-off protection device provided in an embodiment of the present invention is shown;

[0024] Figure 7 Shows Figure 6 A partial enlarged view of point B in the middle.

[0025] The above drawings include the following reference numerals:

[0026] 1. Lower shell; 2. Upper shell; 3. Mounting seat; 4. Buckle; 5. Slot; 6. First power connection member; 7. Second power connection member; 8. Mounting tube; 9. Fixed frame; 10. Movable seat; 11. Pick; 12. Limiting tube; 13. Through slot; 14. Thermosensitive spring; 15. Push plate; 16. Moving frame; 17. Fixed plate; 18. Fixed seat; 19. Ratchet; 20. Swinging frame; 21. Roller; 22. Ratchet; 23. Cam; 24. First reciprocating screw; 25. Driving motor; 26. Cleaning member; 27. Guide rod; 28. Heat dissipation port; 29. ​​Second reciprocating screw; 30. Stabilizing plate; 31. Ventilation port; 32. Wind shield; 33. Slide; 34. Connecting rod; 35. First contact member; 36. Second contact member; 37. Shell; 38. Power connection assembly; 39. Thermosensitive elastic member;

[0027] X, the width direction of the shell; Y, the length direction of the shell. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] In related technologies, photovoltaic power-off protection uses an external temperature control system, which may cause delays in detection, command transmission and execution, resulting in failure to cut off power in time after the temperature exceeds the safety threshold, increasing safety risks. In addition, the external sensor and control system increases circuit complexity, increases equipment maintenance costs and failure risks, and affects the safety and stability of the photovoltaic system.

[0030] like Figures 1 to 7As shown, an embodiment of the present invention provides a photovoltaic power-off protection device, which includes a shell 37, a power connection component 38 and a thermosensitive elastic member 39. The shell 37 has a accommodating cavity. The power connection component 38 includes a first contact 35 and a second contact 36 arranged in the accommodating cavity. The first contact 35 and / or the second contact 36 are movably arranged relative to the shell 37. The power connection component 38 has a power-on state and a power-off state. When the power connection component 38 is in the power-on state, the first contact 35 and the second contact 36 are in contact. When the power connection component 38 is in the power-off state, the first contact 35 and the second contact 36 are separated. The thermosensitive elastic member 39 is arranged in the accommodating cavity. The thermosensitive elastic member 39 can drive the power connection component 38. When the temperature of the thermosensitive elastic member 39 is greater than or equal to the safety threshold, the thermosensitive elastic member 39 expands and deforms to drive the power connection component 38 to switch from the power-on state to the power-off state.

[0031] The photovoltaic power-off protection device provided in this embodiment includes a shell 37, a power connection component 38 and a thermosensitive elastic member 39. Affected by the temperature of the accommodating cavity, when the temperature of the thermosensitive elastic member 39 is lower than the safety threshold, the thermosensitive elastic member 39 is in an initial contracted state, and the first contact 35 and the second contact 36 are in contact to ensure normal power-on of the circuit. When the temperature of the thermosensitive elastic member 39 is greater than or equal to the safety threshold, the thermosensitive elastic member 39 expands and deforms to drive the power connection component 38 to switch from the power-on state to the power-off state, thereby automatically disconnecting the circuit. This design realizes the temperature-triggered automatic power-off protection function without the need for external manual operation or complex control systems, thereby improving the safety and reliability of the device.

[0032] like Figure 1 and Figure 2 As shown, the first contact 35 and the second contact 36 are arranged in the width direction of the housing 37, and the first contact 35 and the second contact 36 are both swingably arranged on the housing 37, and the swing axis of the first contact 35 is perpendicular to the width direction of the housing 37, and the swing axis of the first contact 35 is parallel to the swing axis of the second contact 36. Affected by the temperature of the accommodating cavity, when the temperature of the thermosensitive elastic member 39 is greater than or equal to the safety threshold, the thermosensitive elastic member 39 expands and deforms, and the thermosensitive elastic member 39 pushes the first contact 35 and the second contact 36 to swing, thereby separating the first contact 35 and the second contact 36, and the power connection component 38 is switched from the power-on state to the power-off state.

[0033] like Figure 3 and Figure 4As shown, the thermosensitive elastic member 39 includes a limiting tube 12, a movable frame 16 and a thermosensitive spring 14. The limiting tube 12 is arranged in the accommodating cavity. The axis of the limiting tube 12 is arranged at an angle with the swing axis of the first contact 35. The movable frame 16 is movably arranged on the limiting tube 12 along the axial direction of the limiting tube 12. The movable frame 16 has a locking groove. The groove depth direction of the locking groove is parallel to the axial direction of the limiting tube 12. The first contact 35 and the second contact 36 extend into the locking groove. The thermosensitive spring 14 is arranged in the limiting tube 12. One end of the thermosensitive spring 14 facing away from the power connection component 38 is connected to the limiting tube 12, and one end of the thermosensitive spring 14 facing the power connection component 38 is connected to the movable frame 16. When the temperature of the thermosensitive elastic member 39 is greater than or equal to the safety threshold, the thermosensitive spring 14 expands and deforms, and the groove bottom of the locking groove abuts against the first contact 35 and the second contact 36 respectively to separate the first contact 35 and the second contact 36. Affected by the temperature of the accommodating cavity, when the temperature of the thermosensitive elastic member 39 is greater than or equal to the safety threshold, the thermosensitive spring 14 expands and deforms, and the thermosensitive spring 14 pushes the moving frame 16 to approach the first contact 35 and the second contact 36, so that the bottom of the positioning groove pushes the first contact 35 and the second contact 36, so that the first contact 35 and the second contact 36 swing apart. When the temperature of the thermosensitive elastic member 39 is less than the safety threshold, the thermosensitive spring 14 contracts and recovers.

[0034] The limiting tube 12 serves as an installation guide for the thermistor spring 14 to ensure that the movable frame 16 moves along a predetermined trajectory, thereby preventing the thermistor spring 14 from shifting during expansion and preventing the shift from affecting the switching of the power-connecting component 38 from the power-on state to the power-off state.

[0035] like Figure 3 and Figure 4 As shown, the movable frame 16 includes a push plate 15, a fixed plate 17 and a plurality of locking plates. One end of the thermistor spring 14 facing the power connection component 38 is connected to the push plate 15. The plurality of locking plates are arranged at intervals along the circumferential direction of the limiting tube 12. The plurality of locking plates extend along the axial direction of the limiting tube 12. The fixed plate 17 is respectively connected to the middle parts of the plurality of locking plates. The fixed plate 17 and two adjacent locking plates are arranged to form a locking groove. When the temperature of the thermosensitive elastic member 39 is greater than or equal to the safety threshold, the thermistor spring 14 expands and pushes the push plate 15 to move along the inner wall of the limiting tube 12, and drives the locking plate and the fixed plate 17 to move, so that the fixed plate 17 pushes the first contact 35 and the second contact 36 to swing the first contact 35 and the second contact 36 apart.

[0036] In this embodiment, the thermosensitive spring 14 can be made of any material selected from nickel-titanium alloy, copper-based shape memory alloy or manganese-copper alloy. These materials have temperature response characteristics, expand and deform when the set temperature threshold is reached, and automatically reset after the temperature is restored, which is suitable for long-term and multiple use. The thermosensitive spring 14 is made of suitable materials according to the working environment. The following are the specific application scenarios of each material:

[0037] (1) NiTi alloy is suitable for applications with a safety threshold between 60°C and 120°C, especially for high-frequency disconnection requirements, and can restore its original shape after cooling;

[0038] (2) Copper-based shape memory alloys are suitable for scenarios with a safety threshold of 70°C to 120°C and are suitable for applications that are cost-sensitive and do not require high shape memory.

[0039] (3) Manganese-copper alloy is suitable for scenarios with a safety threshold of 70°C to 110°C and is used in protective devices with low expansion requirements.

[0040] In this embodiment, the thermistor spring 14 is made of nickel-titanium alloy, the safety threshold is designed to be 90°C, the natural length of the thermistor spring 14 is 20 mm, and when the temperature of the thermistor elastic member 39 is greater than or equal to the safety threshold, the length of the thermistor spring 14 expands to 22 mm to push the push plate 15 to move at least 2 mm.

[0041] like Figure 4 As shown, the limiting tube 12 is provided with a plurality of through slots 13 to ensure air circulation and facilitate temperature exchange between the thermal spring 14 and the air in the housing 37 .

[0042] like Figure 6 and Figure 7 As shown, a plurality of heat dissipation openings 28 are arranged on the housing 37, and the photovoltaic power-off protection device further comprises a cleaning member 26, a driving member and a temperature control member. The cleaning member 26 can be movably arranged at the heat dissipation opening 28, and the driving member is drivingly connected to the cleaning member 26 to drive the cleaning member 26 to clean the heat dissipation opening 28. The temperature control member is arranged in the accommodating cavity, and the temperature control member is signal-connected to the driving member. When the detection result of the temperature control member is greater than or equal to the safety threshold, the temperature control member starts the driving member. When the detection result of the temperature control member is greater than or equal to the safety threshold, the temperature control member starts the driving member to drive the cleaning member 26 to clean the heat dissipation opening 28, keep the heat dissipation opening 28 unobstructed, prevent the heat dissipation opening 28 from affecting air circulation due to blockage, and ensure effective heat dissipation inside the housing 37.

[0043] like Figure 6 and Figure 7As shown, the heat dissipation vent 28 adopts a strip structure extending along the length direction of the shell 37. A guide rod 27 is arranged in the shell 37, and the guide rod 27 extends along the length direction of the shell 37. The cleaning member 26 is movably sleeved on the guide rod 27 along the extension direction of the guide rod 27. The driving member includes a driving motor 25 and a first reciprocating screw rod 24. The driving motor 25 is arranged in the accommodating cavity. The first reciprocating screw rod 24 is rotatably arranged in the accommodating cavity around its axis. The first reciprocating screw rod 24 extends along the length direction of the shell 37. The first reciprocating screw rod 24 is penetrated by the cleaning member 26 and is drivingly connected to the cleaning member 26. The driving motor 25 is drivingly connected to the first reciprocating screw rod 24 to drive the cleaning member 26 to reciprocate along the length direction of the shell 37. The temperature control unit is signal-connected to the driving motor 25. When the detection result of the temperature control unit is greater than or equal to the safety threshold, the temperature control unit starts the drive motor 25, the drive motor 25 drives the first reciprocating screw 24 to rotate, and the first reciprocating screw 24 drives the cleaning member 26 to reciprocate along the guide rod 27, so that the cleaning member 26 cleans the dust and impurities on the surface of the heat dissipation opening 28.

[0044] In this embodiment, the cleaning member 26 includes a moving plate and a cleaning brush. The driving member is drivingly connected to the moving plate to drive the moving plate to reciprocate along the length direction of the housing 37. The cleaning brush is arranged on one side of the moving plate facing the heat dissipation opening 28, and the cleaning brush is movably extended into the heat dissipation opening 28 along the length direction of the housing 37. The first reciprocating screw 24 drives the moving plate to reciprocate along the guide rod 27 to drive the cleaning brush to clean dust and impurities on the surface of the heat dissipation opening 28.

[0045] like Figure 1 , Figure 5 as well as Figure 6As shown, the photovoltaic power-off protection device also includes a ventilation member, which includes a connecting rod 34 and two wind shields 32. The connecting rod 34 is movably arranged on the shell 37 along the length direction of the shell 37, and the extension direction of the connecting rod 34 is arranged at an angle to the length direction of the shell 37. The driving member is drivingly connected to the connecting rod 34 to drive the connecting rod 34 to reciprocate along the length direction of the shell 37. The two wind shields 32 are respectively arranged at both ends of the connecting rod 34, and two vents 31 are arranged on the shell 37. The two vents 31 are respectively arranged opposite to the two wind shields 32. The ventilation member has a ventilation position and a protection position. When the ventilation member is in the ventilation position, the two wind shields 32 respectively open the two vents 31, and when the ventilation member is in the protection position, the two wind shields 32 respectively close the two vents 31. When the detection result of the temperature control unit is greater than or equal to the safety threshold, the temperature control unit starts the driving component, and the driving component synchronously drives the cleaning component 26 and the ventilation component to make the ventilation component reciprocate along the length direction of the shell 37. At this time, the reciprocating movement of the two wind shields 32 is utilized to increase the speed at which air flows into the interior of the shell 37 through the vents 31, ensuring continuous inflow of cold air to achieve efficient cooling. This cooling process buys time for the equipment so that staff can come for inspection and maintenance as soon as possible.

[0046] like Figure 5 As shown, two slide grooves 33 are opened inside the side wall of the lower shell 1, and the two slide grooves 33 are respectively connected with the two vents 31. The outer walls of the two wind shields 32 can be slidably extended into the two slide grooves 33 along the length direction of the shell 37, and the size of the wind shield 32 in the length direction of the shell 37 is larger than the size of the vent 31 in the length direction of the shell 37.

[0047] like Figure 7As shown, the driving member includes a driving motor 25, a cam 23, a swing frame 20, a pawl 22, a ratchet 19 and a second reciprocating screw rod 29. The cam 23 is rotatably arranged in the accommodating cavity. The rotation axis of the cam 23 extends along the length direction of the housing 37. The driving motor 25 is drivingly connected to the cam 23. The middle part of the swing frame 20 is hinged to the housing 37. The hinge axis of the swing frame 20 is parallel to the rotation axis of the cam 23. The cam 23 is slidably matched with one end of the swing frame 20 to drive the swing frame 20 to swing. The pawl 22 is rotatably arranged in the accommodating cavity. Arranged at the other end of the swing frame 20, the ratchet 19 is rotatably arranged in the accommodating chamber, the rotation axis of the ratchet 19 is parallel to the rotation axis of the cam 23, the pawl 22 can engage with the ratchet 19 to drive the ratchet 19 to rotate, the second reciprocating screw 29 is rotatably arranged around its axis in the accommodating chamber, the second reciprocating screw 29 extends along the length direction of the shell 37, the ratchet 19 is sleeved on the second reciprocating screw 29 and connected to the second reciprocating screw 29, the second reciprocating screw 29 is penetrated by the connecting rod 34 and is drivingly connected to the connecting rod 34. When the detection result of the temperature control unit is greater than or equal to the safety threshold, the temperature control unit starts the drive motor 25, and the drive motor 25 drives the cam 23 to rotate. The cam 23 slides with one end of the swing frame 20, so that the swing frame 20 is affected by the high and low points of the cam 23 and rotates intermittently. When the swing frame 20 contacts the lowest point of the cam 23, the cam 23 presses down the swing frame 20, so that the pawl 22 is away from the tooth tip of the ratchet 19. When the swing frame 20 contacts the highest point of the cam 23, the swing frame 20 moves up, and the pawl 22 re-engages the ratchet 19, pushing the ratchet 19 to rotate, so that the second reciprocating screw 29 rotates synchronously and intermittently, and the second reciprocating screw 29 drives the connecting rod 34 and drives the two wind shields 32 to reciprocate along the length direction of the shell 37.

[0048] like Figure 7 As shown, the driving member also includes a roller 21, which is rotatably disposed at one end of the swing frame 20 close to the cam 23, and the outer wall of the roller 21 is tightly attached to the outer wall of the cam 23. When the cam 23 rotates, the cam 23 drives the roller 21 to roll.

[0049] like Figure 6 As shown, a stabilizing plate 30 is disposed on the lower housing 1 , and one end of the first reciprocating screw 24 which faces away from the driving motor 25 is rotatably disposed on the stabilizing plate 30 .

[0050] like Figure 1 and Figure 2 As shown, the power connection assembly 38 also includes a first power connection member 6 and a second power connection member 7. The first power connection member 6 and the second power connection member 7 are both disposed in the housing 37. The first contact 35 is in conduction with the first power connection member 6, and the second contact 36 is in conduction with the second power connection member 7. The first power connection member 6 and the second power connection member 7 facilitate the external circuit connection of the first contact 35 and the second contact 36.

[0051] like Figure 1 As shown, the housing 37 includes a lower housing 1, an upper housing 2 and a quick release member. The lower housing 1 and the upper housing 2 are arranged to form a receiving cavity. The lower housing 1 and the upper housing 2 are connected by the quick release member. The housing 37 includes two quick release members, which are arranged on both sides of the upper housing 2 in a width direction of the housing 37. The upper housing 2 and the lower housing 1 are detachably connected by operating the quick release member, so as to facilitate the inspection, maintenance or installation of the structure in the receiving cavity.

[0052] like Figure 1 and Figure 2 As shown, the first contact 35 includes a movable seat 10 and a paddle 11, a mounting tube 8 is provided at one end of the first power contact 6 located in the accommodating cavity, a fixing frame 9 is provided at one end of the mounting tube 8 facing the second power contact 7, the movable seat 10 is swingably arranged on the fixing frame 9, and the paddle 11 is fixed on the movable seat 10.

[0053] In this embodiment, the first contact 35 and the second contact 36 are symmetrically arranged, and the first power connection piece 6 and the second power connection piece 7 are symmetrically arranged.

[0054] like Figure 1 and Figure 5 As shown, the quick release part includes a mounting seat 3 and a buckle 4, the mounting seat 3 is arranged on the upper shell 2, the buckle 4 is swingably arranged on the mounting seat 3, a clamping groove 5 is arranged on the outer side wall of the lower shell 1, and the buckle 4 has a clamping hook that can be clamped with the clamping groove 5. When it is necessary to inspect, maintain or install the structure in the accommodating cavity, the buckle 4 can be directly opened to move the clamping hook out of the clamping groove 5, thereby releasing the fixation between the lower shell 1 and the upper shell 2, so that the lower shell 1 and the upper shell 2 are separated.

[0055] like Figure 7 As shown, a fixing seat 18 is arranged on the inner bottom wall of the lower housing 1 , a cam 23 , a ratchet 19 and a swing frame 20 are all arranged on the fixing seat 18 , and a driving motor 25 is arranged on the lower housing 1 .

[0056] like Figure 2 and Figure 3 As shown, the limiting tube 12 is arranged on the inner wall of the upper shell 2 .

[0057] It should be noted that the width direction of the housing 37 is Figure 3 In the X direction, the length direction of the housing 37 is Figure 6 In the Y direction.

[0058] The photovoltaic power failure protection device provided in this embodiment has the following beneficial effects:

[0059] (1) The thermosensitive spring 14 automatically responds to temperature changes. When the temperature of the thermosensitive elastic member 39 is greater than or equal to the safety threshold, the thermosensitive spring 14 expands and deforms, and the thermosensitive spring 14 pushes the movable frame 16 to approach the first contact 35 and the second contact 36, so that the bottom of the positioning groove pushes the first contact 35 and the second contact 36, so that the first contact 35 and the second contact 36 swing apart, and the circuit is automatically disconnected. This design realizes the automatic power-off protection function triggered by temperature, without the need for external manual operation or complex control system, thereby improving the safety and reliability of the device;

[0060] (2) When the detection result of the temperature control unit is greater than or equal to the safety threshold, the temperature control unit starts the driving unit to drive the cleaning unit 26 to clean the dust and impurities on the surface of the heat dissipation opening 28, so as to keep the heat dissipation opening 28 unobstructed, and effectively prevent the heat dissipation efficiency from being reduced due to dust blockage. After cleaning, the heat dissipation opening 28 can increase the air flow, thereby effectively reducing the internal temperature of the housing 37 and extending the life of the equipment;

[0061] (3) When the detection result of the temperature control unit is greater than or equal to the safety threshold, the temperature control unit starts the driving member, and the driving member synchronously drives the cleaning member 26 and the ventilation member to reciprocate along the length direction of the shell 37. At this time, the reciprocating movement of the two windshield plates 32 increases the speed of air flowing into the shell 37 through the vent 31, ensuring that cold air continues to flow in, achieving efficient cooling, providing a rapid cooling guarantee for the equipment, providing a safe operating environment for the shell 37, and avoiding equipment damage caused by high temperature;

[0062] (4) When the temperature inside the shell 37 is greater than or equal to the safety threshold, the cleaning member 26 is used to automatically clean the heat dissipation vent 28, the ventilation member is used to quickly dissipate heat, and the thermosensitive elastic member 39 is used to push the first contact 35 and the second contact 36 to automatically cut off the power, thereby achieving all-round safety protection, greatly reducing the need for manual intervention, providing a complete safety guarantee for the photovoltaic equipment, effectively preventing equipment failure or fire hazards caused by excessive temperature, and improving the overall operating reliability and safety of the photovoltaic system.

[0063] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0064] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0065] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0066] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0067] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A photovoltaic power failure protection device, characterized in that: The photovoltaic power failure protection device comprises: A housing (37) having a receiving cavity; A power connection assembly (38), comprising a first contact (35) and a second contact (36) arranged in the accommodating cavity, wherein the first contact (35) and / or the second contact (36) are movably arranged relative to the housing (37), and the power connection assembly (38) has a power-on state and a power-off state. When the power connection assembly (38) is in the power-on state, the first contact (35) and the second contact (36) are in contact with each other, and when the power connection assembly (38) is in the power-off state, the first contact (35) and the second contact (36) are separated from each other; A thermosensitive elastic member (39) is arranged in the accommodating cavity, and the thermosensitive elastic member (39) can drive the power connection component (38). When the temperature of the thermosensitive elastic member (39) is greater than or equal to a safety threshold, the thermosensitive elastic member (39) expands and deforms to drive the power connection component (38) to switch from the power-on state to the power-off state.

2. The photovoltaic power failure protection device according to claim 1, characterized in that: The first contact (35) and the second contact (36) are arranged in the width direction of the shell (37); the first contact (35) and the second contact (36) are both swingably arranged on the shell (37); the swing axis of the first contact (35) is perpendicular to the width direction of the shell (37); and the swing axis of the first contact (35) is parallel to the swing axis of the second contact (36).

3. The photovoltaic power failure protection device according to claim 2, characterized in that: The thermosensitive elastic member (39) comprises: A limiting tube (12) is arranged in the accommodating cavity, and the axis of the limiting tube (12) is arranged at an angle with the swing axis of the first contact (35); A movable frame (16) is movably arranged on the limiting tube (12) along the axial direction of the limiting tube (12), the movable frame (16) having a locking groove, the groove depth direction of the locking groove is parallel to the axial direction of the limiting tube (12), and the first contact (35) and the second contact (36) extend into the locking groove; A thermal spring (14) is arranged in the limiting tube (12); one end of the thermal spring (14) facing away from the power connection component (38) is connected to the limiting tube (12); one end of the thermal spring (14) facing the power connection component (38) is connected to the movable frame (16); when the temperature of the thermal elastic member (39) is greater than or equal to a safety threshold, the thermal spring (14) expands and deforms, and the bottom of the locking groove abuts against the first contact (35) and the second contact (36) respectively, so as to separate the first contact (35) and the second contact (36).

4. The photovoltaic power failure protection device according to claim 3, characterized in that: The thermal spring (14) may be made of any one of nickel-titanium alloy, copper-based shape memory alloy or manganese-copper alloy; and / or, The limiting tube (12) is provided with a plurality of through slots (13).

5. The photovoltaic power failure protection device according to claim 1, characterized in that: The housing (37) is provided with a plurality of heat dissipation openings (28), and the photovoltaic power-off protection device further comprises: A cleaning member (26) is movably disposed at the heat dissipation opening (28); A driving member, drivingly connected to the cleaning member (26) to drive the cleaning member (26) to clean the heat dissipation opening (28); A temperature control unit is arranged in the accommodating cavity, the temperature control unit is connected to the driving member by signal, and when the detection result of the temperature control unit is greater than or equal to the safety threshold, the temperature control unit starts the driving member.

6. The photovoltaic power failure protection device according to claim 5, characterized in that: The heat dissipation opening (28) is in a strip-shaped structure extending in the length direction of the housing (37). A guide rod (27) is arranged in the housing (37). The guide rod (27) extends in the length direction of the housing (37). The cleaning member (26) is movably sleeved on the guide rod (27) in the extending direction of the guide rod (27). The driving member comprises a driving motor (25) and a first reciprocating screw rod (24), the driving motor (25) being arranged in the accommodating cavity, the first reciprocating screw rod (24) being rotatably arranged in the accommodating cavity around its axis, the first reciprocating screw rod (24) extending along the length direction of the shell (37), the first reciprocating screw rod (24) passing through the cleaning member (26) and being drivingly connected to the cleaning member (26), the driving motor (25) being drivingly connected to the first reciprocating screw rod (24) so ​​as to drive the cleaning member (26) to reciprocate along the length direction of the shell (37), the temperature control unit being signal-connected to the driving motor (25); and / or, The cleaning member (26) comprises a movable plate and a cleaning brush. The driving member is drivingly connected to the movable plate to drive the movable plate to reciprocate along the length direction of the shell (37). The cleaning brush is arranged on a side of the movable plate facing the heat dissipation opening (28). The cleaning brush is movably extended into the heat dissipation opening (28) along the length direction of the shell (37).

7. The photovoltaic power failure protection device according to claim 5, characterized in that: The photovoltaic power failure protection device further includes a ventilation member, and the ventilation member includes: A connecting rod (34) is movably arranged on the shell (37) along the length direction of the shell (37); the extending direction of the connecting rod (34) is arranged at an angle with the length direction of the shell (37); the driving member is drivingly connected to the connecting rod (34) to drive the connecting rod (34) to reciprocate along the length direction of the shell (37); Two wind shields (32) are respectively arranged at two ends of the connecting rod (34); two ventilation holes (31) are arranged on the shell (37); the two ventilation holes (31) are respectively arranged opposite to the two wind shields (32); the ventilation member has a ventilation position and a protection position; when the ventilation member is in the ventilation position, the two wind shields (32) respectively open the two ventilation holes (31); when the ventilation member is in the protection position, the two wind shields (32) respectively close the two ventilation holes (31).

8. The photovoltaic power failure protection device according to claim 7, characterized in that: The driving member comprises: A driving motor (25); A cam (23) is rotatably disposed in the accommodating cavity, the rotation axis of the cam (23) extends along the length direction of the housing (37), and the driving motor (25) is drivingly connected to the cam (23); A swing frame (20), wherein the middle portion of the swing frame (20) is hinged to the housing (37), the hinge axis of the swing frame (20) is parallel to the rotation axis of the cam (23), and the cam (23) is slidably matched with one end of the swing frame (20) to drive the swing frame (20) to swing; A ratchet pawl (22) rotatably disposed at the other end of the swing frame (20); A ratchet wheel (19) is rotatably disposed in the accommodating cavity, the rotation axis of the ratchet wheel (19) is parallel to the rotation axis of the cam (23), and the pawl (22) can mesh with the ratchet wheel (19) to drive the ratchet wheel (19) to rotate; A second reciprocating screw rod (29) is rotatably arranged around its axis in the accommodating cavity. The second reciprocating screw rod (29) extends along the length direction of the shell (37). The ratchet wheel (19) is sleeved on the second reciprocating screw rod (29) and connected to the second reciprocating screw rod (29). The second reciprocating screw rod (29) is passed through the connecting rod (34) and is drivingly connected to the connecting rod (34).

9. The photovoltaic power failure protection device according to claim 1, characterized in that: The power connection assembly (38) further comprises a first power connection member (6) and a second power connection member (7), wherein the first power connection member (6) and the second power connection member (7) are both disposed through the housing (37), the first contact member (35) is electrically connected to the first power connection member (6), and the second contact member (36) is electrically connected to the second power connection member (7).

10. The photovoltaic power failure protection device according to claim 1, characterized in that: The housing (37) comprises a lower housing (1), an upper housing (2) and a quick-release member, wherein the lower housing (1) and the upper housing (2) are arranged to form the accommodating cavity, and the lower housing (1) and the upper housing (2) are connected via the quick-release member. The housing (37) comprises two quick-release parts, and the two quick-release parts are arranged oppositely on two sides of the upper housing (2) in the width direction of the housing (37); and / or, The quick-release component comprises a mounting seat (3) and a buckle (4); the mounting seat (3) is arranged on the upper shell (2); the buckle (4) is swingably arranged on the mounting seat (3); a clamping groove (5) is arranged on the outer side wall of the lower shell (1); and the buckle (4) has a clamping hook that can be clamped with the clamping groove (5).

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