A wind turbine cable joint fire protection device

Abstract

This application discloses a fire protection device for wind turbine cable joints, belonging to the technical field of wind power equipment. The fire protection device includes a male joint, a female joint, and a protective sleeve fitted over the connection between the male joint's housing one and the female joint's housing two. It also includes an elastic structure disposed within the housing two for conducting electricity by allowing conductive contacts to contact conductive pins within the housing one during normal operation; an electromagnetic repulsion driving structure disposed within the housing one and connected to the elastic structure; and a fire-fighting structure disposed on the protective sleeve and connected to the elastic structure. This fire protection device for wind turbine cable joints achieves active overload disconnection through the combination of the elastic structure and the electromagnetic repulsion driving structure, blocking overheating risks at the source. Simultaneously, the fire-fighting structure releases insulating dry powder, which enters the joint through a channel to suppress electric arcs and form an insulation barrier, preventing secondary damage and improving electrical safety.

Description

Technical Field

[0001] This application relates to the field of wind power generation equipment technology, specifically a fire protection device for a wind turbine cable joint. Background Technology

[0002] In wind power generation systems, cable joints, as the core nodes for power transmission and signal conduction, must withstand extreme conditions such as high outdoor humidity, strong wind and sand erosion, continuous mechanical vibration, and alternating high and low temperatures day and night. The stability of their electrical connections and their safety protection capabilities are directly related to the overall power generation efficiency, service life, and maintenance safety of the system.

[0003] Currently, wind turbine cable joints generally adopt traditional mechanical crimping or threaded fastening combined with simple insulating tape wrapping and heat shrink tubing sealing design. Although this can meet the basic conductivity requirements, during normal operation, it relies entirely on the pre-tightening force of the mechanical structure to maintain the contact between the conductive contacts and the pins. Under long-term vibration loads, it is prone to loosening and damage, which in turn causes the contact resistance to soar, ultimately inducing circuit overload. When the circuit is overloaded, the current will sharply exceed the rated value, generating a large amount of Joule heat. This can easily cause the joint insulation layer to age, melt, or even carbonize and catch fire. This not only directly leads to the burning of the cable joint, but is also more likely to trigger a chain reaction, inducing major safety accidents such as the shutdown of the entire machine and fire.

[0004] Therefore, this application provides a fire protection device for wind turbine cable joints to solve the above problems. Summary of the Invention

[0005] This application provides a fire protection device for wind turbine cable joints, which aims to solve the problems mentioned in the background art, such as the existing wind turbine cable joints adopting traditional mechanical connections and simple insulation designs, which are prone to loosening of the connection and overload due to long-term vibration. The large amount of Joule heat generated by the overload can easily cause damage to the insulation layer and fire, thereby inducing major safety accidents such as machine shutdown and fire.

[0006] To achieve the above objectives, this application provides the following technical solution: a fire protection device for a wind turbine cable joint, comprising a male joint, a female joint, and a protective sleeve fitted on the outside of the connection between the housing of the male joint and the housing of the female joint. The fire protection device also includes an elastic structure installed in the housing 2 for conducting electricity by contacting the conductive contact with the conductive pin in the housing 1 during normal conduction; an electromagnetic repulsion drive structure installed in the housing 1 and connected to the elastic structure for driving the conductive contact and the conductive pin to separate and cut off the fault circuit when the circuit is overloaded; and a fire protection structure installed on the protective sleeve and connected to the elastic structure for flame retardant protection when the conductive contact and the conductive pin are separated and the power is cut off. The fire protection structure includes a storage component fixedly installed on the inner wall of the protective sleeve for storing insulating dry powder; a release component located on the outer side of housing one and housing two and connected to an elastic structure for moving with the conductive contact to release the insulating dry powder from the storage component; and through slots evenly distributed on the outer side of housing one and housing two to guide the insulating dry powder into the internal gap of the male and female connectors. Through the combined design of the elastic structure and the electromagnetic repulsion drive structure, it can not only provide elasticity under normal conductivity to ensure close contact between the conductive contact and the conductive pin to ensure stable conductivity, but also generate repulsion to break through the elasticity when the circuit is overloaded, pushing the conductive contact and the conductive pin to separate and cut off the fault circuit, realizing active overload disconnection and blocking the risk of overheating from the source. At the same time, the release component in the fire protection structure triggers the storage component to release the insulating dry powder as the conductive contact and the conductive pin separate. The dry powder enters the internal gap of the connector through the through slots, which can suppress the interruption arc and form an insulation barrier to prevent arc creep or re-breakdown and secondary damage to the circuit, further improving electrical safety.

[0007] Preferably, to achieve detachable protection at the joint connection, the protective sleeve includes arc-shaped sleeves symmetrically arranged on the outer sides of housing one and housing two, connecting pieces respectively fixedly connected to one side of the two arc-shaped sleeves, and bolts evenly distributed on the two connecting pieces. The two arc-shaped sleeves are hinged on the side away from the connecting pieces, and the two connecting pieces are fixedly connected by multiple bolts. Through the combination of the two hinged arc-shaped sleeves, housing one and housing two can be opened and closed around the hinge during installation, and then locked and fixed by the bolts on the connecting pieces to form a closed protective space. This provides an installation carrier for the storage components, facilitates subsequent disassembly and maintenance, and isolates external environmental interference to ensure the stable operation of the internal components.

[0008] Preferably, in order to enhance the sealing performance of the protective sleeve, sealing rings for abutting against the outer arms of housing one and housing two are fixedly installed at both ends of the inner wall of the two arc-shaped sleeves; the sealing rings are fixed at both ends of the inner wall of the arc-shaped sleeves and can abut tightly against the outer walls of housing one and housing two, filling the gap between the protective sleeve and the housing, thereby forming a waterproof, dustproof and salt spray-proof sealing barrier, thereby preventing external pollutants from entering the joint and causing insulation degradation, and extending the service life of the device.

[0009] Preferably, to achieve tight contact between the conductive contact and the conductive pin under normal conductivity, the elastic structure includes a fixed rod fixedly installed inside the housing second on one side corresponding to the conductive contact; a spring passing through the fixed rod at the end away from the housing second and slidably connected inside the fixed rod for use with the sliding rod; a connecting plate fixedly installed at the end of the sliding rod away from the fixed rod and slidably connected to the housing second; and a mounting plate fixedly installed on one side of the connecting plate for mounting the conductive contact. One end of the spring is fixedly connected to the inside of the fixed rod, and the other end of the spring is fixedly connected to the sliding rod. The fixed rod provides sliding guidance for the sliding rod, and the preload of the spring pushes the sliding rod, causing the connecting plate to drive the conductive contact on the mounting plate to tightly contact the conductive pin, thereby ensuring conductivity stability under normal conductivity. At the same time, it provides stable force balance for the overload disconnection action of the electromagnetic repulsion drive structure, ensuring conductivity reliability and disconnection feasibility.

[0010] Preferably, in order to adapt to the movement stroke of the conductive contact, the side of the conductive contact away from the conductive pin is electrically connected to the cable connected to the female connector via a flexible wire. The flexible wire has the characteristics of being flexible and stretchable. When the conductive contact moves with the connecting plate, the flexible wire can deform synchronously to maintain stable electrical conduction with the cable of the female connector, without restricting the movement trajectory of the conductive contact. This effectively avoids circuit interruption caused by wire breakage, ensures the continuity and stability of the circuit connection before and after overload disconnection, and improves the operational reliability of the device.

[0011] Preferably, in order to provide guidance for the connecting plate, the housing second has a guide groove at the position corresponding to the connecting plate, and the connecting plate passes through the guide groove and is slidably connected in the guide groove; the design of the guide groove allows the connecting plate to slide along the guide groove, restricts its movement direction to avoid deviation, and also facilitates the connecting plate to pass through the guide groove and be connected to the release component.

[0012] Preferably, in order to actively disconnect the faulty circuit when the circuit is overloaded, the electromagnetic repulsion drive structure includes an electromagnetic coil fixedly disposed inside the housing and located on one side of the conductive pin, a magnetic block fixedly installed at the end of the electromagnetic coil away from the housing, and a magnet fixedly installed on the connecting plate for being positioned opposite to the magnetic block and generating a repulsive force. The electromagnetic coil is connected in series with the conductive pin. By connecting the electromagnetic coil and the conductive pin in series, the current increases during an overload, which strengthens the magnetic force of the electromagnetic coil. After the magnetic block strengthens the magnetic field, it can generate a repulsive force with the magnet on the connecting plate. The repulsive force overcomes the spring force and pushes the conductive contact to separate from the conductive pin. Thus, it can quickly respond to overload faults without external power, promptly disconnect the circuit to avoid insulation aging and fire caused by overheating, and improve electrical safety.

[0013] Preferably, for storing insulating dry powder, the storage assembly includes a bladder fixedly installed on the inner wall of the arc-shaped sleeve and located outside the through groove on the first and second housings, and insulating dry powder filled in the bladder; the bladder is fixed on the inner wall of the arc-shaped sleeve and corresponds to the outside of the through groove, which can seal and store the insulating dry powder. When the bladder is punctured, the insulating dry powder can quickly enter the gap inside the male and female connectors through the through groove, thereby ensuring that sufficient and effective insulating medium can be provided when the electric arc is interrupted, and providing reliable protection for the arc suppression function of the fire protection structure.

[0014] Preferably, in order to achieve synchronous triggering of overload disconnection and dry powder release, the release component includes a connecting frame fixedly connected to the side of the connecting plate away from the mounting plate and located outside the housing one and the conductive pin, an annular frame sleeved on the outside of the housing one and the housing two and fixedly connected to the connecting frame, and a spike fixedly installed on the outside of the annular frame for moving with the connecting plate to cut the inside of the capsule; when the connecting plate moves, it drives the connecting frame, so that the annular frame moves synchronously with the connecting plate. The spike on the outside of the annular frame moves away from the groove of the capsule and cuts the capsule, which can release the internal insulating dry powder. This ensures that while the conductive contact and the conductive pin disconnect and generate an electric arc, the dry powder is released immediately and acts on the arc area, preventing arc creep or re-breakdown and secondary damage to the circuit, and further improving electrical safety.

[0015] Preferably, to prevent the spike from accidentally puncturing the capsule when it is not in operation, the capsule is provided with a groove for accommodating the initial position of the spike. By opening the groove at the initial position of the spike in the capsule, the spike can be accommodated in the groove, so that the tip of the spike does not come into contact with the vulnerable part of the capsule. This prevents the spike from accidentally touching the capsule during installation, transportation or normal operation, thus preventing premature leakage of dry powder, avoiding failure of the fire protection structure, and ensuring the safety of dry powder storage when the device is not malfunctioning.

[0016] This wind turbine cable joint fire protection device, through a combination of elastic structure and electromagnetic repulsion drive structure, can not only provide elastic force under normal conductivity to ensure tight contact between the conductive contact piece and the conductive pin to guarantee stable conductivity, but also generate repulsion force to break through the elastic force when the circuit is overloaded, pushing the conductive contact piece and the conductive pin to separate and cut off the fault circuit, thereby achieving active overload disconnection and blocking the risk of overheating from the source. The fire protection device for the wind turbine cable joint releases insulating dry powder through the release component in the fire protection structure, which is triggered by the separation of the conductive contact and the conductive pin. The dry powder enters the internal gap of the joint through the through groove, which can suppress the interrupted electric arc and form an insulation barrier to prevent electric arc creep or re-breakdown and secondary damage to the circuit, thereby further improving electrical safety. Attached Figure Description

[0017] Figure 1A schematic diagram of a fire protection device for a wind turbine cable joint; Figure 2 This is a schematic diagram of a fire protection device for a wind turbine cable joint when the protective sleeve is open. Figure 3 This is a schematic diagram of the structure of a protective sleeve in a fire protection device for a wind turbine cable joint. Figure 4 for Figure 3 Enlarged structural diagram at point A; Figure 5 This is a cross-sectional structural diagram of shell one and shell two in a fire protection device for a wind turbine cable joint; Figure 6 This is a schematic diagram of the elastic structure and electromagnetic repulsion drive structure in a fire protection device for a wind turbine cable joint. Figure 7 This is a schematic diagram of the release component in a fire protection device for a wind turbine cable connector.

[0018] In the picture: 1. Male connector; 11. Housing 1; 12. Conductive pin; 2. Female connector; 21. Housing 2; 211. Guide groove; 22. Conductive contact piece; 3. Protective sleeve; 31. Arc-shaped sleeve; 32. Connecting piece; 33. Bolt; 34. Sealing ring; 4. Elastic structure; 41. Fixed rod; 42. Sliding rod; 43. Spring; 44. Connecting plate; 45. Mounting plate; 5. Electromagnetic repulsion drive structure; 51. Electromagnetic coil; 52. Magnetic block; 53. Magnet; 6. Fire-fighting structure; 61. Storage component; 611. Bag body; 612. Groove; 62. Release component; 621. Connecting frame; 622. Ring frame; 623. Spike; 63. Through slot. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] This embodiment provides a fire protection device for wind turbine cable joints, such as... Figures 1-7As shown, the fire protection device includes a male connector 1, a female connector 2, and a protective sleeve 3 fitted on the outside of the connection between the housing 11 of the male connector 1 and the housing 21 of the female connector 2; the fire protection device also includes an elastic structure 4 installed inside the housing 21 for conducting electricity by contacting the conductive contact 22 with the conductive pin 12 inside the housing 11 during normal conduction; an electromagnetic repulsion drive structure 5 installed inside the housing 11 and connected to the elastic structure 4 for driving the conductive contact 22 and the conductive pin 12 to separate and cut off the fault circuit when the circuit is overloaded; and an electromagnetic repulsion drive structure 5 installed on the protective sleeve 3. A fire-fighting structure 6, connected to the elastic structure 4, is used to provide flame retardancy when the conductive contact 22 and the conductive pin 12 are separated and de-energized. The fire-fighting structure 6 includes a storage component 61 fixedly installed on the inner wall of the protective sleeve 3 for storing insulating dry powder, a release component 62 installed on the outside of the first housing 11 and the second housing 21 and connected to the elastic structure 4 for moving with the conductive contact 22 to release the insulating dry powder from the storage component 61, and through grooves 63, which are opened on the outside of the first housing 11 and the second housing 21 and are evenly distributed to guide the insulating dry powder into the gap between the male connector 1 and the female connector 2.

[0021] In use, initially, the repulsive force of the electromagnetic repulsion drive structure 5 is less than the elastic force of the elastic structure 4. During normal conduction, the elastic structure 4 inside the housing 21 provides stable elastic force, pushing the conductive contact 22 into close contact with the conductive pin 12 inside the housing 11, thus forming a reliable conductive path between the male connector 1 and the female connector 2. Simultaneously, the protective sleeve 3, fitted onto the outside of the connection between the housing 11 and the housing 21, provides basic protection for the internal structure. However, when an overload occurs in the circuit, the electromagnetic repulsion drive structure 5 experiences increased magnetic force due to the increased current. The repulsive force generated by this increased magnetic force overcomes the elastic force of the elastic structure 4, driving the conductive contact 22 into close contact with the conductive pin 12 inside the housing 11. When the contact piece 22 separates from the conductive pin 12, it cuts off the fault circuit and prevents the overload from continuing. At the same time as the conductive contact piece 22 moves and separates with the elastic structure 4, the release component 62 in the fire protection structure 6 connected to the elastic structure 4 moves synchronously. As the conductive contact piece 22 separates and moves, it triggers the storage component 61 on the inner wall of the protective sleeve 3. This allows the insulating dry powder in the storage component 61 to quickly enter the gap between the male connector 1 and the female connector 2 through the through grooves 63 evenly distributed on the outside of the first housing 11 and the second housing 21. This achieves arc suppression after disconnection, prevents arc creep or re-breakdown, and avoids secondary damage to the circuit, thereby further improving electrical safety.

[0022] Specifically, the protective sleeve 3 includes arc-shaped sleeves 31 symmetrically arranged on the outside of housing 11 and housing 21, connecting pieces 32 respectively fixedly connected to one side of the two arc-shaped sleeves 31, and bolts 33 evenly distributed on the two connecting pieces 32. The two arc-shaped sleeves 31 are hinged on the side away from the connecting pieces 32, and the two connecting pieces 32 are fixedly connected by multiple bolts 33. Among them, sealing rings 34 for abutting against the outer arms of housing 11 and housing 21 are fixedly installed at both ends of the inner wall of the two arc-shaped sleeves 31.

[0023] When using the protective sleeve 3, first open the two hinged arc-shaped sleeves 31 outward around the hinge, so that the sealing rings 34 at both ends of the inner wall of the arc-shaped sleeve 31 correspond to the outer walls of the first housing 11 and the second housing 21. Then close the two arc-shaped sleeves 31 inward to wrap around the connection between the first housing 11 and the second housing 21. At this time, the sealing rings 34 are in close contact with the outer walls of the first housing 11 and the second housing 21. Then align the connecting pieces 32 on one side of the two arc-shaped sleeves 31 and lock them in place by tightening the bolts 33 evenly distributed on the connecting pieces 32 in sequence, so that the two arc-shaped sleeves 31 form a closed protective space. At the same time, the sealing rings 34 fill the gap between the arc-shaped sleeves 31 and the first housing 11 and the second housing 21, preventing external pollutants from entering the joint and causing a decrease in insulation, thus extending the service life of the device. When disassembly and maintenance are required, loosen the bolts 33 to separate the connecting pieces 32, open the arc-shaped sleeves 31 around the hinge, and the protective sleeve 3 can be removed to complete the installation or disassembly operation.

[0024] Furthermore, the elastic structure 4 includes a fixed rod 41 fixedly installed inside the housing 21 on one side corresponding to the conductive contact 22, a sliding rod 42 passing through the fixed rod 41 away from the housing 21 and slidably connected inside the fixed rod 41 for use with the conductive contact 22, a spring 43 sleeved on the outside of the sliding rod 42, a connecting plate 44 fixedly installed on the sliding rod 42 away from the fixed rod 41 and slidably connected to the housing 21, and a mounting plate 45 fixedly installed on one side of the connecting plate 44 for mounting and fixing the conductive contact 22. One end of the spring 43 is fixedly connected to the inside of the fixed rod 41, and the other end of the spring 43 is fixedly connected to the sliding rod 42. The side of the conductive contact 22 away from the conductive pin 12 is electrically connected to the cable connected to the female connector 2 through a flexible wire.

[0025] During normal conduction, the spring 43 releases its preload and pushes the sliding rod 42 to slide along the fixed rod 41, causing the conductive contact 22 on the connecting plate 44 and mounting plate 45 to move toward the conductive pin 12 and make close contact to form a conductive path. The conductive contact 22 achieves a stable electrical connection with the cable of the female connector 2 through a flexible wire. When the circuit is overloaded, the repulsive force generated by the electromagnetic repulsion drive structure 5 pushes the connecting plate 44 to slide in the opposite direction, causing the sliding rod 42 to compress the spring 43 and separate the conductive contact 22 from the conductive pin 12. At this time, the flexible wire deforms synchronously with the movement of the conductive contact 22 to maintain the continuity of the electrical connection and avoid the wire from being pulled and broken.

[0026] In addition, in order to provide guidance for the connecting plate 44, the housing 21 is provided with a guide groove 211 at the position corresponding to the connecting plate 44. The connecting plate 44 passes through the guide groove 211 and is slidably connected in the guide groove 211. The design of the guide groove 211 allows the connecting plate 44 to slide along the guide groove 211, restricting its movement direction to avoid deviation. At the same time, it also facilitates the connecting plate 44 to pass through the guide groove 211 and connect to the release assembly 62 for use.

[0027] Furthermore, the electromagnetic repulsion drive structure 5 includes an electromagnetic coil 51 fixedly disposed inside the housing 11 and located on one side of the conductive pin 12, a magnetic block 52 fixedly disposed at the end of the electromagnetic coil 51 away from the housing 11, and a magnet 53 fixedly disposed on the connecting plate 44 for being disposed opposite to the magnetic block 52 and generating repulsion. The electromagnetic coil 51 is connected in series with the conductive pin 12.

[0028] During normal conduction, the rated current flows through the circuit, and the magnetic force generated by the electromagnetic coil 51 is relatively weak. After being strengthened by the magnetic block 52, the repulsive force formed between the electromagnetic coil 51 and the magnet 53 is less than the elastic force of the spring 43 of the elastic structure 4. Under the action of the elastic structure 4, the conductive contact 22 maintains close contact with the conductive pin 12 to maintain conduction. However, when the circuit is overloaded, the current in the conductive circuit increases, and the magnetic force of the series-connected electromagnetic coil 51 is strengthened due to the increased current. After the magnetic block 52 further strengthens the magnetic field, the repulsive force generated between the electromagnetic coil 51 and the magnet 53 increases synchronously and breaks through the elastic force of the spring 43, pushing the connecting plate 44 to move the conductive contact 22 away from the conductive pin 12, thereby realizing the rapid separation of the conductive contact 22 from the conductive pin 12 to cut off the fault circuit.

[0029] Furthermore, the storage assembly 61 includes a bladder 611 fixedly mounted on the inner wall of the arc-shaped sleeve 31 and located outside the through groove 63 on the housing 11 and housing 21, and insulating dry powder filled in the bladder 611.

[0030] During normal conduction, the capsule 611 remains intact under the protection of the arc sleeve 31, and the insulating dry powder is stably stored inside the capsule 611 to prevent moisture, leakage, or external contamination. When the circuit overload causes the conductive contact 22 to separate from the conductive pin 12, the release component 62 moves with the connecting plate 44 of the elastic structure 4 and tears the capsule 611. Under its own weight and the release impact force, the insulating dry powder inside the capsule 611 quickly flows into the gap between the male connector 1 and the female connector 2 through the through grooves 63 on the first shell 11 and the second shell 21. The insulating dry powder extinguishes the arc generated by the break and forms an insulating barrier to prevent creepage or secondary breakdown. The insulating dry powder is ABC type dry powder, sodium bicarbonate dry powder, or special electrical insulating dry powder, which can quickly block current conduction and suppress arc reignition.

[0031] It is worth noting that the release assembly 62 includes a connecting frame 621 fixedly connected to the side of the connecting plate 44 away from the mounting plate 45 and located outside the housing 11 and the conductive pin 12, an annular frame 622 sleeved on the outside of the housing 11 and the housing 21 and fixedly connected to the connecting frame 621, and a spike 623 fixedly installed on the outside of the annular frame 622 for moving with the connecting plate 44 to cut the inside of the bladder 611.

[0032] During normal conduction, the connecting plate 44 remains stationary under the action of the elastic structure 4. The connecting frame 621 drives the ring frame 622 and the spike 623 to the initial position. The spike 623 does not contact the capsule 611, and the capsule 611 remains intact to seal and store the insulating dry powder. When the circuit is overloaded, the electromagnetic repulsion drive structure 5 pushes the connecting plate 44 to move away from the conductive pin 12. The connecting plate 44 drives the connecting frame 621 to move synchronously. At this time, the connecting frame 621 drives the ring frame 622 and the outer spike 623 to move together. During the movement, the spike 623 contacts the inner side of the capsule 611 and cuts the capsule 611, so that the insulating dry powder in the capsule 611 can be released and enter the interior of the connector through the through groove 63.

[0033] Furthermore, to prevent the spike 623 from accidentally puncturing the capsule 611 when not in operation, the capsule 611 is provided with a groove 612 for the initial position of the spike 623. During assembly, the groove 612 is aligned with the spike 623 to ensure that the spike 623 can be embedded in the groove 612 after installation, so that the tip of the spike 623 does not come into contact with the vulnerable part of the capsule 611. Under normal operating conditions, the spike 623 is always contained in the groove 612. Even if the device is subjected to transportation bumps, installation collisions, or vibrations during wind turbine operation, the spike 623 will not be damaged. 23 will not come into contact with the non-grooved area of ​​the capsule 611, effectively preventing accidental puncture of the capsule 611 and premature leakage of insulating dry powder. When the circuit overload triggers the release component 62 to operate, the connecting plate 44 drives the connecting frame 621, the ring frame 622 and the spike 623 to move synchronously. After the spike 623 is removed from the groove 612, it contacts the inside of the capsule 611 along the moving direction and cuts the capsule 611, ensuring that the insulating dry powder is accurately released when needed. This ensures the integrity of the capsule 611 in the non-working state and does not affect the fire protection function during overload.

[0034] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and concept of this application, should be included within the scope of protection of this application.

Claims

1. A fire protection device for a wind turbine cable joint, comprising a male joint (1), a female joint (2), and a protective sleeve (3) fitted on the outside of the connection between the housing one (11) of the male joint (1) and the housing two (21) of the female joint (2). Its features are: The fire protection device further includes an elastic structure (4) installed in the second housing (21) for conducting electricity by contacting the conductive contact (22) with the conductive pin (12) in the first housing (11) during normal conduction; an electromagnetic repulsion drive structure (5) installed in the first housing (11) and connected to the elastic structure (4) for driving the conductive contact (22) and the conductive pin (12) to separate and cut off the fault circuit when the circuit is overloaded; and a fire protection structure (6) installed on the protective sleeve (3) and connected to the elastic structure (4) for flame retardant protection when the conductive contact (22) and the conductive pin (12) are separated and the power is cut off. The fire protection structure (6) includes a storage component (61) fixedly installed on the inner wall of the protective sleeve (3) for storing insulating dry powder, a release component (62) installed on the outside of the first housing (11) and the second housing (21) and connected to the elastic structure (4) for separating and moving with the conductive contact (22) to release the insulating dry powder from the storage component (61), and through grooves (63) respectively opened on the outside of the first housing (11) and the second housing (21) and evenly distributed for guiding the insulating dry powder into the gap inside the male connector (1) and the female connector (2).

2. The fire protection device for wind turbine cable joints according to claim 1, characterized in that: The protective sleeve (3) includes arc-shaped sleeves (31) symmetrically arranged on the outside of the first shell (11) and the second shell (21), connecting pieces (32) respectively fixedly connected to one side of the two arc-shaped sleeves (31), and bolts (33) evenly distributed on the two connecting pieces (32). The two arc-shaped sleeves (31) are hinged on the side away from the connecting pieces (32), and the two connecting pieces (32) are fixedly connected by multiple bolts (33).

3. The fire protection device for wind turbine cable joints according to claim 2, characterized in that: Both ends of the inner walls of the two arc-shaped sleeves (31) are fixedly fitted with sealing rings (34) for contacting the outer arms of housing one (11) and housing two (21).

4. The fire protection device for wind turbine cable joints according to claim 2, characterized in that: The elastic structure (4) includes a fixed rod (41) fixedly installed inside the housing (21) on one side corresponding to the conductive contact (22), a spring (43) sleeved on the outside of the sliding rod (42), a connecting plate (44) fixedly installed on one side of the sliding rod (42) away from the fixed rod (21) and slidably connected to the housing (21), and a mounting plate (45) fixedly installed on one side of the connecting plate (44) for mounting and fixing the conductive contact (22). One end of the spring (43) is fixedly connected to the inside of the fixed rod (41), and the other end of the spring (43) is fixedly connected to the sliding rod (42).

5. The fire protection device for wind turbine cable joints according to claim 4, characterized in that: The conductive contact (22) on the side away from the conductive pin (12) is electrically connected to the cable connected to the female connector (2) via a flexible wire.

6. The fire protection device for wind turbine cable joints according to claim 4, characterized in that: The housing 2 (21) has a guide groove (211) at the position corresponding to the connecting plate (44), and the connecting plate (44) passes through the guide groove (211) and is slidably connected in the guide groove (211).

7. The fire protection device for wind turbine cable joints according to claim 6, characterized in that: The electromagnetic repulsion drive structure (5) includes an electromagnetic coil (51) fixedly disposed inside the housing (11) and located on one side of the conductive pin (12), a magnetic block (52) fixedly installed at the end of the electromagnetic coil (51) away from the housing (11), and a magnet (53) fixedly installed on the connecting plate (44) for being disposed opposite to the magnetic block (52) and generating repulsion. The electromagnetic coil (51) is connected in series with the conductive pin (12).

8. The fire protection device for wind turbine cable joints according to claim 6, characterized in that: The storage assembly (61) includes a bladder (611) fixedly installed on the inner wall of the arc sleeve (31) and located outside the through groove (63) on the first housing (11) and the second housing (21), and insulating dry powder filled in the bladder (611).

9. The fire protection device for wind turbine cable joints according to claim 8, characterized in that: The release assembly (62) includes a connecting frame (621) fixedly connected to the side of the connecting plate (44) away from the mounting plate (45) and located outside the housing one (11) and the conductive pin (12), an annular frame (622) sleeved on the outside of the housing one (11) and the housing two (21) and fixedly connected to the connecting frame (621), and a spike (623) fixedly installed on the outside of the annular frame (622) for moving with the connecting plate (44) to cut the inside of the bladder (611).

10. The fire protection device for wind turbine cable joints according to claim 9, characterized in that: The capsule (611) has a groove (612) for receiving the spike (623) at its initial position.

Images