Photovoltaic disconnect protection device

Abstract

The application provides a photovoltaic power-off protection device, which comprises a shell with a containing cavity, an electricity connection assembly comprising a first contact and a second contact arranged in the containing cavity, the first contact and / or the second contact being movably arranged relative to the shell, the electricity connection assembly having an electricity connection state and a power-off state, the first contact and the second contact being in contact when the electricity connection assembly is in the electricity connection state, and the first contact and the second contact being separated when the electricity connection assembly is in the power-off state, and a thermosensitive elastic member arranged in the containing cavity, the thermosensitive elastic member being capable of driving the electricity connection assembly, the thermosensitive elastic member being deformed by expansion when the temperature of the thermosensitive elastic member is greater than or equal to a safety threshold, so as to drive the electricity connection assembly to switch from the electricity connection state to the power-off state. Through the technical scheme provided in the application, the problem that photovoltaic power-off protection in the related art depends on an external temperature control system can be solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of photovoltaic circuit devices, in particular to a photovoltaic power-off protection device. BACKGROUND

[0002] With the rapid development of photovoltaic power generation technology, photovoltaic systems have been widely used in various power generation scenarios. However, in the working process of the photovoltaic system, especially when it operates under extreme conditions such as high temperature and strong light, the temperature of the photovoltaic system components is prone to rise rapidly, which may cause damage to the photovoltaic system equipment or reduce the efficiency, and even cause fire safety hazards. Therefore, how to quickly realize safe power-off protection when the temperature of the photovoltaic system is abnormal has become a problem that needs to be solved in the design of the photovoltaic system.

[0003] In the related art, the photovoltaic power-off protection uses an external temperature control system to detect the working temperature of the photovoltaic system by using a temperature sensor, and an electrical control circuit sends a power-off instruction according to 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, and once the external temperature control system fails or the power is off, the power-off protection function will not work normally. SUMMARY

[0005] The present application provides a photovoltaic power-off protection device to solve the problem that the photovoltaic power-off protection in the related art relies on an external temperature control system.

[0006] The present application provides a photovoltaic power-off protection device, which comprises: a shell having a receiving cavity; an electrical connection component comprising a first contact and a second contact arranged in the receiving cavity, the first contact and / or the second contact being movably arranged relative to the shell, the electrical connection component having an electrical connection state and a power-off state, when the electrical connection component is in the electrical connection state, the first contact and the second contact are in contact, and when the electrical connection component is in the power-off state, the first contact and the second contact are separated; a heat-sensitive elastic member arranged in the receiving cavity, the heat-sensitive elastic member being capable of driving the electrical connection component, when the temperature of the heat-sensitive elastic member is greater than or equal to a safety threshold, the heat-sensitive elastic member expands and deforms to drive the electrical connection component to switch from the electrical connection state to the power-off state.

[0007] Further, 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 swingably arranged on the shell, the swing axis of the first contact being perpendicular to the width direction of the shell, and the swing axis of the first contact being parallel to the swing axis of the second contact.

[0008] Furthermore, the thermosensitive elastic part 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. When the temperature of the thermosensitive elastic part is greater than or equal to the safety threshold, the thermosensitive spring expands and deforms, and the 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 slots.

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

[0011] Furthermore, the heat dissipation vent adopts a strip structure extending along the length direction of the shell, a guide rod is provided 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 provided in the accommodating chamber, the first reciprocating screw is rotatably provided in the accommodating chamber around its axis, the first reciprocating screw extends along the length direction of the shell, the first reciprocating screw is passed through the cleaning piece and is driven and connected to the cleaning piece, the driving motor is driven and 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 connected to the driving motor signal; and / or, the cleaning piece includes a movable plate and a cleaning brush, the driving piece is driven and connected to the movable plate to drive the movable plate to reciprocate along the length direction of the shell, the cleaning brush is provided on the side of the movable plate facing the heat dissipation vent, and the cleaning brush is movably extended into the heat dissipation vent along the length direction of the shell.

[0012] Further, the photovoltaic power-off protection device further comprises a ventilation member, the ventilation member comprises: a connecting rod 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, the driving member is drivingly connected with the connecting rod to drive the connecting rod to reciprocate along the length direction of the shell; two wind baffles are respectively arranged at both ends of the connecting rod, two ventilation openings are arranged on the shell, the two ventilation openings are respectively arranged opposite to the two wind baffles, the ventilation member has a ventilation position and a protection position, when the ventilation member is in the ventilation position, the two wind baffles respectively open the two ventilation openings, when the ventilation member is in the protection position, the two wind baffles respectively close the two ventilation openings.

[0013] Further, the driving member comprises: a driving motor; a cam rotatably arranged in the accommodating cavity, the rotation axis of the cam extends along the length direction of the shell, the driving motor is drivingly connected with 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, the cam is slidingly matched with one end of the swing frame to drive the swing frame to swing; a pawl rotatably arranged at the other end of the swing frame; a ratchet rotatably arranged in the accommodating cavity, the rotation axis of the ratchet is parallel to the rotation axis of the cam, the pawl can be engaged with the ratchet to drive the ratchet to rotate; a second reciprocating screw rod rotatably arranged in the accommodating cavity around its axis, the second reciprocating screw rod extends along the length direction of the shell, the ratchet is sleeved on the second reciprocating screw rod and connected with the second reciprocating screw rod, the second reciprocating screw rod is arranged through the connecting rod and drivingly connected with the connecting rod.

[0014] Further, the power connection assembly further comprises a first power connection member and a second power connection member, the first power connection member and the second power connection member are both arranged through the shell, the first contact is in conduction with the first power connection member, and the second contact is in conduction with the second power connection member.

[0015] Further, the shell comprises a lower shell, an upper shell and a quick release member, the lower shell and the upper shell surround to form the accommodating cavity, the lower shell and the upper shell are connected through the quick release member, the shell comprises two quick release members, the two quick release members are oppositely arranged on both sides of the upper shell in the width direction of the shell; and / or, the quick release member comprises a mounting seat and a buckle, the mounting seat is arranged on the upper shell, the buckle is swingably arranged on the mounting seat, a clamping groove is arranged on the outer side wall of the lower shell, and the buckle has a clamping hook capable of being clamped with the clamping groove.

[0016] The photovoltaic power-off protection device provided by the technical scheme of the present application comprises a shell, an electricity connection assembly and a thermosensitive elastic element, and is affected by the temperature of the accommodating cavity; when the temperature of the thermosensitive elastic element is less than a safety threshold, the thermosensitive elastic element is in an initial contraction state, the first contact and the second contact are in contact, and the normal power-on of the circuit is ensured; when the temperature of the thermosensitive elastic element is greater than or equal to the safety threshold, the thermosensitive elastic element expands and deforms to drive the electricity connection assembly to switch from the electricity connection state to the power-off state, and the automatic power-off protection function triggered by the temperature is realized, without the need for external manual operation or a complex control system, thereby improving the safety and reliability of the device. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings, which form a part of the present application, are used to provide further understanding of the present application, and serve as an explanation of the illustrative embodiments of the present application and their description, and do not constitute improper limitations of the present application. In the drawings:

[0018] Figure 1 A structure schematic diagram of a photovoltaic power-off protection device provided by an embodiment of the present application is shown;

[0019] Figure 2 A structure schematic diagram of an upper shell, a first electricity connection element and a second electricity connection element of a photovoltaic power-off protection device provided by an embodiment of the present application is shown;

[0020] Figure 3 A structure schematic diagram of a lower shell of a photovoltaic power-off protection device provided by an embodiment of the present application is shown; Figure 2 A partial enlarged view of position A in FIG. 4 is shown;

[0021] Figure 4 A structure schematic diagram of a thermosensitive elastic element of a photovoltaic power-off protection device provided by an embodiment of the present application is shown;

[0022] Figure 5 A structure schematic diagram of a lower shell of a photovoltaic power-off protection device provided by an embodiment of the present application is shown;

[0023] Figure 6 A structure schematic diagram of a lower shell, a driving element, a cleaning element and a ventilation element of a photovoltaic power-off protection device provided by an embodiment of the present application is shown;

[0024] Figure 7 A structure schematic diagram of a lower shell of a photovoltaic power-off protection device provided by an embodiment of the present application is shown; Figure 6 A partial enlarged view of position B in FIG. 5 is shown.

[0025] In the above drawings, the following reference signs are used:

[0026] 1, lower shell; 2, upper shell; 3, mounting seat; 4, buckle; 5, clamping groove; 6, first electrical connector; 7, second electrical connector; 8, mounting pipe; 9, fixed frame; 10, movable seat; 11, push piece; 12, limiting pipe; 13, through slot; 14, thermal sensitive spring; 15, push plate; 16, moving frame; 17, fixed plate; 18, fixed seat; 19, ratchet wheel; 20, swing frame; 21, roller; 22, pawl; 23, cam; 24, first reciprocating screw; 25, drive motor; 26, cleaning piece; 27, guide rod; 28, heat dissipation opening; 29, second reciprocating screw; 30, stabilizing plate; 31, ventilation opening; 32, wind deflector; 33, sliding groove; 34, connecting rod; 35, first contact; 36, second contact; 37, shell; 38, electrical connector assembly; 39, thermal sensitive elastic member;

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

[0028] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all. The description of the at least one example embodiment is actually only illustrative, not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0029] In the related art, photovoltaic power-off protection adopts an external temperature control system, which may have a delay in detection, instruction transmission and execution process, so that the photovoltaic system cannot be powered off in time after the temperature exceeds the safety threshold, increasing the safety risk. In addition, the external sensing and control system increases the complexity of the circuit, increases the equipment maintenance cost and the risk of failure, and affects the safety and stability of the photovoltaic system.

[0030] As Figures 1 to 7As shown, the embodiment of the present application provides a photovoltaic power-off protection device, the photovoltaic power-off protection device comprises a shell 37, an electrical connection assembly 38 and a thermosensitive elastic element 39, the shell 37 has a receiving cavity, the electrical connection assembly 38 comprises a first contact 35 and a second contact 36 arranged in the receiving cavity, the first contact 35 and / or the second contact 36 are movably arranged relative to the shell 37, the electrical connection assembly 38 has an electrical connection state and a power-off state, when the electrical connection assembly 38 is in the electrical connection state, the first contact 35 and the second contact 36 are in contact, when the electrical connection assembly 38 is in the power-off state, the first contact 35 and the second contact 36 are separated, the thermosensitive elastic element 39 is arranged in the receiving cavity, and the thermosensitive elastic element 39 can drive the electrical connection assembly 38, when the temperature of the thermosensitive elastic element 39 is greater than or equal to a safety threshold, the thermosensitive elastic element 39 expands and deforms to drive the electrical connection assembly 38 to switch from the electrical connection state to the power-off state.

[0031] The photovoltaic power-off protection device provided by the embodiment is used, the photovoltaic power-off protection device comprises a shell 37, an electrical connection assembly 38 and a thermosensitive elastic element 39, and is affected by the temperature of the receiving cavity, when the temperature of the thermosensitive elastic element 39 is less than a safety threshold, the thermosensitive elastic element 39 is in an initial contracted state, the first contact 35 and the second contact 36 are in contact, and the normal power-on of the circuit is ensured, when the temperature of the thermosensitive elastic element 39 is greater than or equal to the safety threshold, the thermosensitive elastic element 39 expands and deforms to drive the electrical connection assembly 38 to switch from the electrical connection state to the power-off state, and the automatic disconnection of the circuit is realized, the design realizes the automatic power-off protection function triggered by the temperature, without the need for external manual operation or a complex control system, thereby improving the safety and reliability of the device.

[0032] As shown in Figure 1 and Figure 2 , 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 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. Affected by the temperature of the receiving cavity, when the temperature of the thermosensitive elastic element 39 is greater than or equal to a safety threshold, the thermosensitive elastic element 39 expands and deforms, the thermosensitive elastic element 39 pushes the first contact 35 and the second contact 36 to make the first contact 35 and the second contact 36 swing, so that the first contact 35 and the second contact 36 are separated, and the electrical connection assembly 38 switches from the electrical connection state to the power-off state.

[0033] As shown in 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, and the axis of the limiting tube 12 is arranged at an angle to 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, and 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, and the end of the thermosensitive spring 14 facing away from the power connection component 38 is connected to the limiting tube 12, and the 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 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. Influenced by the temperature of the accommodating chamber, when the temperature of the thermosensitive elastic member 39 is greater than or equal to a safety threshold, the thermosensitive spring 14 expands and deforms, pushing the movable frame 16 toward the first contact 35 and the second contact 36. This causes the bottom of the retaining groove to push the first contact 35 and the second contact 36, causing them to swing apart. When the temperature of the thermosensitive elastic member 39 falls below the safety threshold, the thermosensitive spring 14 contracts and recovers.

[0034] Among them, the limiting tube 12 serves as an installation guide for the thermal spring 14, ensuring that the movable frame 16 moves along a predetermined trajectory, preventing the thermal spring 14 from deflecting during expansion, and avoiding the deflection affecting the switching of the power connection 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 thermal 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 the two adjacent locking plates are arranged to form a locking groove. When the temperature of the thermal elastic member 39 is greater than or equal to the safety threshold, the thermal 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 apart.

[0036] In the embodiment, the thermal sensitive spring 14 can be made of any of the following materials: nickel-titanium alloy, copper-based shape memory alloy or manganese-copper alloy, which all have temperature response characteristics, expand and deform when reaching a set temperature threshold, and automatically reset after the temperature returns to normal, suitable for long-term and multiple use. The thermal sensitive spring 14 is made of a suitable material according to the working environment, and the specific application scenarios of each material are as follows:

[0037] (1) Nickel-titanium alloy is suitable for application scenarios with a safety threshold of 60-120°C, especially for high-frequency disconnection requirements, and can restore the original shape after cooling;

[0038] (2) Copper-based shape memory alloy is suitable for scenarios with a safety threshold of 70-120°C, and is suitable for cost-sensitive applications with low shape memory requirements;

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

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

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

[0042] As shown in Figure 6 and Figure 7 , the shell 37 is provided with a plurality of heat dissipation openings 28, 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 is movably arranged at the heat dissipation opening 28, the driving member is drivingly connected with the cleaning member 26 to drive the cleaning member 26 to clean the heat dissipation opening 28, and the temperature control member is arranged in the accommodating cavity and is signal connected with 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, so as to keep the heat dissipation opening 28 unobstructed, prevent the heat dissipation opening 28 from being blocked to affect air circulation, and ensure effective heat dissipation inside the shell 37.

[0043] As shown in 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 provided in the shell 37, and the guide rod 27 extends along the length direction of the shell 37. The cleaning member 26 is movably mounted 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 passed through the cleaning member 26 and is driven and connected to the cleaning member 26. The driving motor 25 is driven and 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 move back and forth along the guide rod 27, so that the cleaning member 26 cleans the dust and impurities on the surface of the heat dissipation vent 28.

[0044] In this embodiment, the cleaning member 26 includes 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 of the housing 37. The cleaning brush is disposed on the side of the movable plate facing the heat dissipation vent 28 and is movable along the length of the housing 37 and extends into the heat dissipation vent 28. The first reciprocating screw 24 drives the movable plate to reciprocate along the guide rod 27, thereby driving the cleaning brush to clean dust and impurities from the surface of the heat dissipation vent 28.

[0045] like Figure 1 、 Figure 5 as well as Figure 6As shown, the photovoltaic power-off protection device further comprises a ventilation member, the ventilation member comprises a connecting rod 34 and two wind baffles 32, the connecting rod 34 is movably arranged on the shell 37 along the length direction of the shell 37, the extension 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 with the connecting rod 34 to drive the connecting rod 34 to reciprocatingly move along the length direction of the shell 37, the two wind baffles 32 are respectively arranged at two ends of the connecting rod 34, the shell 37 is provided with two ventilation openings 31, the two ventilation openings 31 are respectively arranged opposite to the two wind baffles 32, the ventilation member has a ventilation position and a protection position, when the ventilation member is at the ventilation position, the two wind baffles 32 respectively open the two ventilation openings 31, when the ventilation member is at the protection position, the two wind baffles 32 respectively close the two ventilation openings 31. When the detection result of the temperature control member is greater than or equal to the safety threshold value, the temperature control member starts the driving member, the driving member synchronously drives the cleaning member 26 and the ventilation member to make the ventilation member reciprocatingly move along the length direction of the shell 37, at this time, the reciprocating movement of the two wind baffles 32 increases the speed of air flowing into the inside of the shell 37 through the ventilation openings 31, ensures that cold air continuously flows in, realizes efficient cooling, and this cooling process gains time for the equipment so that the staff can come to repair and maintain as soon as possible.

[0046] As shown in the figure, Figure 5 The inside of the side wall of the lower shell 1 is provided with two sliding grooves 33, the two sliding grooves 33 are respectively communicated with the two ventilation openings 31, the outer walls of the two wind baffles 32 are respectively slidably extended into the two sliding grooves 33 along the length direction of the shell 37, the size of the wind baffle 32 in the length direction of the shell 37 is greater than the size of the ventilation opening 31 in the length direction of the shell 37.

[0047] As shown in the figure, Figure 7As shown, the driving member comprises a driving motor 25, a cam 23, a swing frame 20, a pawl 22, a ratchet wheel 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 shell 37, the driving motor 25 is drivingly connected with the cam 23, the middle part of the swing frame 20 is hingedly connected with the shell 37, the hinged axis of the swing frame 20 is parallel to the rotation axis of the cam 23, the cam 23 is slidingly matched with one end of the swing frame 20 to drive the swing frame 20 to swing, the pawl 22 is rotatably arranged at the other end of the swing frame 20, the ratchet wheel 19 is rotatably arranged in the accommodating cavity, the rotation axis of the ratchet wheel 19 is parallel to the rotation axis of the cam 23, the pawl 22 can be engaged with the ratchet wheel 19 to drive the ratchet wheel 19 to rotate, the second reciprocating screw rod 29 is rotatably arranged in the accommodating cavity around its axis, 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 with the second reciprocating screw rod 29, the second reciprocating screw rod 29 is arranged through the connecting rod 34 and drivingly connected with the connecting rod 34. When the detection result of the temperature control device is greater than or equal to the safety threshold value, the temperature control device starts the driving motor 25, the driving motor 25 drives the cam 23 to rotate, the cam 23 is slidingly matched with one end of the swing frame 20, so that the swing frame 20 is intermittently rotated under the action of the high and low points of the cam 23, when the swing frame 20 contacts with the lowest point of the cam 23, the cam 23 presses down the swing frame 20, so that the pawl 22 moves away from the tooth tip of the ratchet wheel 19, when the swing frame 20 contacts with the highest point of the cam 23, the swing frame 20 moves up, the pawl 22 re-engages the ratchet wheel 19, pushes the ratchet wheel 19 to rotate, so that the second reciprocating screw rod 29 is synchronously and intermittently rotated, the second reciprocating screw rod 29 drives the connecting rod 34 and drives the two windshields 32 to reciprocate along the length direction of the shell 37.

[0048] As shown in Figure 7 , the driving member further comprises a roller 21, the roller 21 is rotatably arranged at one end of the swing frame 20 close to the cam 23, 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] As shown in Figure 6 , the lower shell 1 is provided with a stable plate 30, one end of the first reciprocating screw rod 24 away from the driving motor 25 is rotatably arranged on the stable plate 30.

[0050] As shown in Figure 1 and Figure 2 , the power connection assembly 38 further comprises a first power connection piece 6 and a second power connection piece 7, the first power connection piece 6 and the second power connection piece 7 are both arranged through the shell 37, the first contact piece 35 is in conduction with the first power connection piece 6, and the second contact piece 36 is in conduction with the second power connection piece 7. By using the first power connection piece 6 and the second power connection piece 7, it is convenient to externally connect the circuit to the first contact piece 35 and the second contact piece 36.

[0051] As shown in Figure 1 , the shell 37 comprises a lower shell 1, an upper shell 2 and quick-release parts, the lower shell 1 and the upper shell 2 surround a containing cavity, and the lower shell 1 and the upper shell 2 are connected through the quick-release parts. The shell 37 comprises two quick-release parts, which are oppositely arranged on both sides of the upper shell 2 in the width direction of the shell 37. The detachable connection of the upper shell 2 and the lower shell 1 is realized by operating the quick-release parts, so as to facilitate the maintenance or installation of the structure in the containing cavity.

[0052] As shown in Figure 1 and Figure 2 , the first contact 35 comprises a movable seat 10 and a push piece 11. One end of the first electrical contact 6 located in the containing cavity is provided with a mounting pipe 8, and the end of the mounting pipe 8 facing the second electrical contact 7 is provided with a fixing frame 9. The movable seat 10 is swingably arranged on the fixing frame 9, and the push piece 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 electrical contact 6 and the second electrical contact 7 are symmetrically arranged.

[0054] As shown in Figure 1 and Figure 5 , the quick-release part comprises a mounting seat 3 and a buckle 4. The mounting seat 3 is arranged on the upper shell 2, and the buckle 4 is swingably arranged on the mounting seat 3. The outer side wall of the lower shell 1 is provided with a clamping groove 5, and the buckle 4 has a clamping hook capable of clamping with the clamping groove 5. When it is necessary to maintain or install the structure in the containing cavity, the buckle 4 can be directly pulled open, so that the clamping hook is moved out of the clamping groove 5, thereby releasing the fixing between the lower shell 1 and the upper shell 2, and separating the lower shell 1 and the upper shell 2.

[0055] As shown in Figure 7 , the inner bottom wall of the lower shell 1 is provided with a fixing seat 18, and the cam 23, the ratchet wheel 19 and the swing frame 20 are arranged on the fixing seat 18. The driving motor 25 is arranged on the lower shell 1.

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

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

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

[0059] (1) The heat-sensitive spring 14 automatically responds to temperature changes. When the temperature of the heat-sensitive elastic member 39 is greater than or equal to the safety threshold, the heat-sensitive spring 14 expands and deforms, the heat-sensitive spring 14 pushes the moving frame 16 close to the first contact 35 and the second contact 36, the groove bottom of the clamping groove pushes the first contact 35 and the second contact 36, the first contact 35 and the second contact 36 swing apart, and the automatic disconnection of the circuit is realized. 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 device is greater than or equal to the safety threshold, the temperature control device starts the driving member to drive the cleaning member 26 to clean the dust and impurities on the surface of the heat dissipation opening 28, keeping the heat dissipation opening 28 unobstructed, effectively preventing dust from blocking the heat dissipation opening 28, and effectively reducing the temperature inside the shell 37, thereby prolonging the service life of the device.

[0061] (3) When the detection result of the temperature control device is greater than or equal to the safety threshold, the temperature control device starts the driving member, and the driving member synchronously drives the cleaning member 26 and the ventilation member to move along the length direction of the shell 37. At this time, the reciprocating movement of the two wind baffles 32 increases the speed of air flowing into the shell 37 through the ventilation opening 31, ensuring that cold air continuously flows in, achieving efficient cooling and providing a safe operating environment for the shell 37, while avoiding damage to the device 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 opening 28, the ventilation member is used to achieve rapid heat dissipation, and the heat-sensitive elastic member 39 is used to push the first contact 35 and the second contact 36 to achieve automatic power-off, thereby achieving all-round safety protection, greatly reducing the need for manual intervention, providing perfect safety protection for photovoltaic equipment, effectively preventing equipment failure or fire hazards caused by high temperature, and improving the overall operation reliability and safety of the photovoltaic system.

[0063] It should be noted that the terms used herein are only for the purpose of describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and furthermore, it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or combination thereof.

[0064] The foregoing is considered as illustrative only of the principles of the application. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the application to the exact construction and practice described. Accordingly, all such variations are intended to be included within the scope of the present application as defined in the following claims, along with full equivalents thereof.

[0065] In the description of the present application, it is to be understood that the orientation or positional relationships indicated by terms such as "front", "back", "up", "down", "left", "right", "lateral", "vertical", "horizontal", "top", "bottom", and the like are generally based on the orientation or positional relationships shown in the drawings, and are merely intended to facilitate the description and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore cannot be construed as limiting the scope of protection of the present application. The orientation terms "inner", "outer" refer to the inner and outer relative to the contour of the components themselves.

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

[0067] In addition, it should be noted that the use of the terms "first", "second", and the like do not have a special meaning, and are merely used to distinguish the corresponding components, and therefore cannot be construed as limiting the scope of protection of the present application.

[0068] The above merely provides the preferred embodiments of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the principles and technical scope of the present application shall fall into the scope of the present application.

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) includes a first contact (35) and a second contact (36) disposed in the accommodating cavity, wherein the first contact (35) and / or the second contact (36) are movably disposed 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 disposed in the accommodating cavity, and the thermosensitive elastic member (39) is capable of driving 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. 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) and the swing axis of the first contact (35) are arranged at an angle. 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. In the groove, the 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), and 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 the safety threshold, the thermal spring (14) expands and deforms, and the bottom of the positioning groove abuts against the first contact (35) and the second contact (36) respectively to separate the first contact (35) and the second contact (36).

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), and 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 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).

4. 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), so as to drive the cleaning member (26) to clean the heat dissipation opening (28); A temperature control unit is provided 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.

5. The photovoltaic power failure protection device according to claim 4, characterized in that: The heat dissipation opening (28) adopts a strip-shaped structure extending along the length direction of the shell (37); a guide rod (27) is provided in the shell (37); 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 (24), the driving motor (25) is arranged in the accommodating cavity, the first reciprocating screw (24) is rotatably arranged around its axis in the accommodating cavity, the first reciprocating screw (24) extends along the length direction of the shell (37), the first reciprocating screw (24) is passed through 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 (24) to drive the cleaning member (26) to reciprocate along the length direction of the shell (37), and the temperature control unit is signal-connected to the driving motor (25); and / or, The cleaning member (26) includes a movable plate and a cleaning brush. The driving member is 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).

6. The photovoltaic power failure protection device according to claim 4, characterized in that: The photovoltaic power failure protection device further includes a ventilation component, which includes: A connecting rod (34) is movably arranged on the housing (37) along the length direction of the housing (37), the extending direction of the connecting rod (34) is arranged at an angle to the length direction of the housing (37), and 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 housing (37); Two windshields (32) are respectively arranged at both ends of the connecting rod (34); two ventilation openings (31) are respectively arranged on the housing (37); the two ventilation openings (31) are respectively arranged opposite to the two windshields (32); the ventilation member has a ventilation position and a protection position; when the ventilation member is in the ventilation position, the two windshields (32) respectively open the two ventilation openings (31); when the ventilation member is in the protection position, the two windshields (32) respectively close the two ventilation openings (31).

7. The photovoltaic power failure protection device according to claim 6, characterized in that: The driving member includes: Drive motor (25); A cam (23) is rotatably disposed in the accommodating cavity, wherein the rotation axis of the cam (23) extends along the length direction of the housing (37), and the drive 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 engaged with one end of the swing frame (20) to drive the swing frame (20) to swing; A ratchet (22) rotatably disposed at the other end of the swing frame (20); A ratchet (19) is rotatably disposed in the accommodating cavity, wherein the rotation axis of the ratchet (19) is parallel to the rotation axis of the cam (23), and the pawl (22) is capable of engaging with the ratchet (19) to drive the ratchet (19) to rotate; A second reciprocating screw (29) is rotatably arranged around its axis in the accommodating cavity. The second reciprocating screw (29) extends along the length direction of the housing (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 passed through the connecting rod (34) and is drivingly connected to the connecting rod (34).

8. The photovoltaic power failure protection device according to claim 1, characterized in that: The power connection assembly (38) further includes 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 provided through the housing (37), the first contact member (35) is in electrical communication with the first power connection member (6), and the second contact member (36) is in electrical communication with the second power connection member (7).

9. 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. The lower housing (1) and the upper housing (2) are arranged to form the accommodating cavity. 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 both 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 slot (5) is provided on the outer side wall of the lower shell (1); and the buckle (4) has a hook capable of engaging with the slot (5).

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