Prefabricated terminal of high-voltage alternating-current cross-linked polyethylene cable

Abstract

The invention belongs to the technical field of insulating sleeves, and particularly discloses a high-voltage alternating-current cross-linked polyethylene cable prefabricated terminal which comprises an outgoing line fitting, an anti-corona cover, a sleeve, a stress cone, a tail pipeline and an insulator, the anti-corona cover is arranged at the top end of the stress cone, the outgoing line fitting is installed at the top end of the anti-corona cover, and the tail pipeline is connected to the bottom end of the stress cone. The outer side of the stress cone is sleeved with a sleeve, the sleeve is filled with insulating oil, and the bottom end of the stress cone is connected with the bottom frame through a plurality of insulators. The bottom end of the stress cone is installed on the bottom plate through a plurality of screws, and the tail pipeline is limited on the bottom face of the bottom plate through a limiting component. Through spiral matching of the screw rod and the bottom plate and limitation of the push plate, the lantern ring is horizontally arranged, the lantern ring moving upwards limits the inclined face through the inner inclined groove, the lantern ring clamps the tail pipeline through cooperation of the multiple ring pieces, deviation of the stress cone on the top of the bottom plate due to simple collision is avoided, and the vertical stability of the stress cone is guaranteed.

Description

Technical Field

[0001] This invention belongs to the field of insulating sleeve technology, and specifically relates to a prefabricated terminal for a high-voltage AC cross-linked polyethylene cable. Background Technology

[0002] Cable terminations are essential cable accessories that reliably connect underground cables to high-voltage transmission lines on high-voltage towers. Current cable termination products include dry-type silicone rubber terminations and oil-filled terminations, with oil-filled terminations being the most widely used.

[0003] The main function of the current oil-filled terminal is to connect the cable and the stress cone, while also providing sealing and insulation. When the cable is installed on the bracket, it is easy for the cable to shift on the bracket under the impact of external objects, resulting in an unstable connection between the cable and the stress cone.

[0004] Therefore, it is necessary to invent a prefabricated terminal for high-voltage AC cross-linked polyethylene cables to solve the above problems. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a prefabricated terminal for high-voltage AC cross-linked polyethylene cables, thereby resolving the issues raised in the background section.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a prefabricated terminal for a high-voltage AC cross-linked polyethylene cable, comprising outgoing fittings, an anti-corona cover, a sleeve, a stress cone, a tail tube, and insulators. The stress cone has an anti-corona cover at its top, and an outgoing fitting is installed at the top of the anti-corona cover. The tail tube is connected to the bottom of the stress cone, and a sleeve is fitted around the outside of the stress cone. The sleeve is filled with insulating oil. Multiple insulators connect the bottom of the stress cone to a base frame. Multiple screws mount the bottom of the stress cone to a base plate. A limiting component defines the tail tube on the bottom surface of the base plate. The limiting component includes: a collar fitted around the outside of the tail tube; a ring plate engaged with the inner wall of the collar for clamping the tail tube; side plates, with multiple side plates fixed annularly on the outer circumference of the collar; and a screw penetrating the side plates for fixing the collar to the bottom surface of the base plate.

[0007] Furthermore, the inner wall of the collar is provided with multiple inner inclined grooves, each corresponding to a different ring piece, and the top of the outer side of the ring piece is provided with an inclined surface.

[0008] Furthermore, the upward-moving collar slides on the inclined surface using an inner groove, which drives the ring plate to squeeze the tailpipe.

[0009] Furthermore, the top end of the screw is helically inserted into the bottom surface of the base plate, a push plate is fixed at the bottom end of the screw, and a ring frame is provided at the bottom of the base plate. The screw uses the push plate to limit the ring frame at the bottom of the base plate.

[0010] Furthermore, a sliding plate is provided at the bottom of the side plate, and a plug is fixed inside the sliding plate. The plug is inserted into the bottom end of the ring piece, and two crossbars pass through the ring frame on the outer side of the sliding plate.

[0011] Furthermore, the push plate is configured as a circular plate, which cooperates with the bottom opening of the sealing ring frame.

[0012] Furthermore, the slide plate uses a locking pin to lock the ring plate, and the top surface of the slide plate is in contact with the bottom surface of the side plate.

[0013] Furthermore, the ring frame is provided with a locking part for locking the crossbar. The locking part includes an inner ring, a side bracket, and a locking tooth. The bottom end of the screw is connected to the push plate via a connecting part. The inner ring is sleeved on the outside of the connecting part. Two opposing side brackets are connected to the outer side of the inner ring. The locking tooth is fixed on the top of the inner side of the side bracket. Multiple slots are opened on the surface of the crossbar, and the locking tooth is engaged in the slot.

[0014] Furthermore, the outer convex surface of the side frame fits against the inner wall of the annular groove, and the inner side surface of the side frame abuts against the outer circumferential side surface of the crossbar.

[0015] Furthermore, multiple protruding plates are fixed on the outer circumference of the connecting part, and the multiple protruding plates cooperate to support the inner ring.

[0016] The technical effects and advantages of this invention are as follows: 1. This invention uses the screw and the base plate to spirally engage, and under the constraint of the push plate, the collar is set horizontally. The upward-moving collar uses the inner inclined groove to limit the inclined surface. The collar uses multiple ring plates to clamp the tail pipe, avoiding the stress cone from shifting at the top of the base plate due to simple collisions, and ensuring the vertical stability of the stress cone.

[0017] 2. The present invention uses a rotating connecting part to move the side frame upward inside the ring frame. The side frame uses a locking tooth and a locking groove to fasten the ring piece. At this time, the crossbar uses a sliding plate and a plug to further lock the ring piece, preventing the ring piece from loosening inside the collar. The rotating screw causes the push plate to move the ring frame upward. At this time, the ring frame uses a crossbar to lock the ring piece with the plug inside the sliding plate, preventing the stress cone from separating from the base plate due to collision. Attached Figure Description

[0018] Figure 1 This is an overall schematic diagram of a prefabricated high-voltage AC cross-linked polyethylene cable terminal according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the tail pipe being defined by a defining component at the bottom of the base plate according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the top structure of the collar according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the ring frame at the bottom of the side plate according to an embodiment of the present invention; Figure 5This is a schematic diagram of the side frame using locking teeth to lock the crossbar according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the inner ring outer side connecting the side frame according to an embodiment of the present invention; In the diagram: 1. Outgoing line hardware; 2. Anti-corona cover; 3. Bushing; 4. Stress cone; 5. Tail pipe; 6. Insulator; 7. Base frame; 8. Base plate; 9. Collar; 901. Inner inclined groove; 10. Ring plate; 11. Side plate; 12. Screw; 13. Inclined surface; 14. Push plate; 15. Ring frame; 16. Slide plate; 17. Insert rod; 18. Crossbar; 181. Slot; 19. Inner ring; 20. Side frame; 21. Clamping tooth; 22. Connecting part; 23. Protruding plate. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0020] This invention provides a prefabricated terminal for a high-voltage AC cross-linked polyethylene cable, such as... Figure 1 and Figure 2 As shown, it includes outgoing hardware 1, anti-corona cover 2, sleeve 3, stress cone 4, tail line 5, and insulator 6. The anti-corona cover 2 is provided at the top of the stress cone 4, and the outgoing hardware 1 is installed at the top of the anti-corona cover 2. The tail line 5 is connected to the bottom of the stress cone 4. The sleeve 3 is sleeved on the outside of the stress cone 4. The inside of the sleeve 3 is filled with insulating oil. The bottom of the stress cone 4 is connected to the base frame 7 by multiple insulators 6. The bottom of the stress cone 4 is installed on the base plate 8 by multiple screws.

[0021] Specifically, flanges are installed at both the top and bottom of the stress cone 4. These flanges are made of corrosion-resistant aluminum alloy. An anti-corrosion shield 2 is installed at the top of the stress cone 4 via the flange. The anti-corrosion shield 2 is made of high-performance silicone rubber, and its interior is filled with polyisobutylene to reinforce the external insulation, providing electric field stress control. A sleeve 3 is annularly fitted to the outside of the stress cone 4. The sleeve 3 consists of an inner glass fiber tube and an outer silicone rubber shed, and is filled with insulating oil. The flange at the bottom of the stress cone 4 is connected to the center of the base plate 8 via a tail pipe 5. The outer surface of the tail pipe 5 is made of polyethylene material. The base plate 8 is mounted on top of the base frame 7 using multiple insulators 6, and the base frame 7 is fixed to the ground.

[0022] To limit the tailpipe 5 at the bottom of the base plate 8, a limiting component is used to limit the tailpipe 5. Figures 2 to 4The components include: a collar 9, a ring piece 10, a side plate 11, a screw 12, and an inclined surface 13. The collar 9 is generally circular. Multiple side plates 11 are fixed on the outer circumference of the collar 9. Multiple equally spaced inner inclined grooves 901 are provided on the inner side wall of the collar 9. The inner side wall of the inner inclined grooves 901 is inclined. The multiple inner inclined grooves 901 correspond one-to-one with the multiple side plates 11. Multiple ring pieces 10 are provided on the inner side of the collar 9. The multiple ring pieces 10 correspond one-to-one with the multiple inner inclined grooves 901. An inclined surface 13 is provided on the top of the outer side of the ring piece 10. The inclined surface 13 fits with the inner inclined groove 901. A screw 12 is vertically inserted into the center of the side plate 11. The top of the screw 12 is spirally inserted into the bottom surface of the base plate 8. A push plate 14 is fixed to the bottom end of the screw 12. A ring frame 15 is provided at the bottom of the base plate 8. The screw 12 uses the push plate 14 to limit the ring frame 15 at the bottom of the base plate 8.

[0023] Specifically, the collar 9 is fitted onto the outside of the tailpipe 5. At this time, multiple ring pieces 10 are correspondingly snapped into the inside of the collar 9. The concave surface of the ring piece 10 is in contact with the outer circumference of the tailpipe 5, and the inclined surface 13 is in contact with the inner inclined groove 901. The collar 9 is pushed up until the top surface of the ring piece 10 is in contact with the bottom surface of the base plate 8. The upward-moving collar 9 uses the inner inclined groove 901 to limit the inclined surface 13. Since the base plate 8 limits the ring piece 10, the collar 9 uses multiple ring pieces 10 to squeeze the tailpipe 5.

[0024] The top of the screw 12 is vertically inserted through the ring frame 15 into the center of the side plate 11. The screw 12 is rotated, and the top of the screw 12 is gradually screwed into the bottom surface of the base plate 8. The upward-moving screw 12 pushes the ring frame 15 upward with the push plate 14. The screw 12 and the base plate 8 are screwed together so that the top surface of the ring frame 15 is in contact with the bottom surface of the side plate 11. The ring frame 15 uses the side plate 11 to make the collar 9 press against the inclined surface 13. At this time, the top surface of the collar 9 does not contact the bottom surface of the base plate 8.

[0025] The four screws 12 are all limited by the push plate 14 to the four side plates 11 of the collar 9. The four side plates 11 make the collar 9 horizontally set. The collar 9 uses multiple ring plates 10 to clamp the tail pipe 5.

[0026] If the tailpipe 5 is made of a soft material, the rotating screw 12 and the spiral engagement of the base plate 8 cause the collar 9 to move upward. At this time, the collar 9 slides on the inclined surface 13 using the inner inclined groove 901. The upward-moving collar 9 uses the inclined surface 13 to make multiple ring plates 10 approach each other. The compression of the ring plates 10 causes the tailpipe 5 to deform. Under the compression of multiple ring plates 10, the stability of the tailpipe 5 on the base plate 8 is ensured.

[0027] In this embodiment, the screw 12 and the base plate 8 are screwed together, and the push plate 14 limits the collar 9 to be set horizontally. The upward collar 9 uses the inner inclined groove 901 to limit the inclined surface 13. The collar 9 uses multiple ring plates 10 to clamp the tail pipe 5, so as to avoid the stress cone 4 from shifting at the top of the base plate 8 due to simple collisions, and to ensure the vertical stability of the stress cone 4.

[0028] To lock the ring 10, the insert rod 17 is used to limit the ring 10. Figure 4 and Figure 5 In the middle, a sliding plate 16 is provided at the bottom of the side plate 11, and a plug rod 17 is fixed on the inner side of the sliding plate 16. The plug rod 17 is inserted into the bottom end of the ring piece 10. The outer side of the sliding plate 16 is penetrated by two crossbars 18 through the ring frame 15.

[0029] Specifically, the screw 12 vertically penetrates the ring frame 15. At this time, the outer end face of the slide plate 16 is penetrated by two horizontal bars 18 through the ring frame 15. The screw 12 is located between the two horizontal bars 18. The two horizontal bars 18 are used to limit the push plate 14 by the screw 12. The push plate 14 is set as a circular plate. At this time, the circular plate cooperates to block the bottom opening of the ring frame 15. The screw 12 vertically penetrates the side plate 11. Rotating the push plate 14 causes the screw 12 to gradually spirally insert into the bottom surface of the base plate 8. The upward-moving push plate 14 uses the ring frame 15 and the horizontal bars 18 to move the slide plate 16 and the insertion rod 17 upward until the top surface of the ring frame 15 is in contact with the bottom surface of the side plate 11. The inner side of the slide plate 16 is vertically inserted into the bottom surface of the ring piece 10 by the insertion rod 17. The top surface of the slide plate 16 is in contact with the bottom surface of the side plate 11.

[0030] In this embodiment, the rotating screw 12 causes the push plate 14 to move the ring frame 15 upward. At this time, the ring frame 15 uses the crossbar 18 to lock the ring piece 10 with the insert rod 17 inside the slide plate 16, so as to prevent the stress cone 4 from separating from the base plate 8 due to collision.

[0031] To lock the ring 10, the locking part locks the crossbar 18. Figures 4 to 6 In the middle, the ring frame 15 is provided with a locking part for locking the crossbar 18. The locking part includes an inner ring 19, a side bracket 20, and a locking tooth 21. The bottom end of the screw 12 is connected to the push plate 14 via a connecting part 22. The inner ring 19 is sleeved on the outside of the connecting part 22. Two opposing side brackets 20 are connected to the outer side of the inner ring 19. The locking tooth 21 is fixed to the top of the inner side of the side bracket 20. Multiple slots 181 are opened on the surface of the crossbar 18, and the locking tooth 21 is snapped into the slot 181. The outer convex surface of the side bracket 20 fits against the inner side wall of the ring frame 15, and the inner side of the side bracket 20 abuts against the outer circumference of the crossbar 18. Multiple protruding plates 23 are fixed to the outer circumference of the connecting part 22, and the multiple protruding plates 23 cooperate to support the inner ring 19.

[0032] Specifically, the ring frame 15 is pushed upward. The upward-moving ring frame 15 uses two crossbars 18 to push the slide plate 16 and the collar 9 upward. Since the insert rod 17 is inserted into the bottom end of the ring piece 10, when the top surface of the ring piece 10 is attached to the bottom surface of the base plate 8, the collar 9, which continues to move upward, slides on the inclined surface 13 using the inner inclined groove 901. The sliding collar 9 uses the inclined surface 13 to make multiple ring pieces 10 squeeze the soft material tail tube 5. At this time, the ring piece 10 uses the insert rod 17 to make the slide plate 16 move inward. The inward-moving slide plate 16 pulls the crossbar 18 to move. The crossbar 18 moves inside the ring frame 15 until the crossbar 18 can no longer move.

[0033] The push plate 14 and screw 12 are rotated by rotation. The rotating push plate 14 causes multiple convex plates 23 to rotate synchronously through the connecting part 22. The multiple convex plates 23 push the inner ring 19 and side frame 20 to move upward. At this time, the outer side of the side frame 20 moves upward on the inner side wall of the ring frame 15. The upward side frame 20 moves upward in the slot 181 through the locking teeth 21 until the top surface of the side frame 20 is in contact with the bottom surface of the base plate 8. The locking teeth 21 and the slot 181 cooperate to lock the crossbar 18.

[0034] In this embodiment, the side frame 20 moves upward inside the ring frame 15 by rotating the connecting part 22. The side frame 20 is engaged by the locking teeth 21 and the locking groove 181. At this time, the crossbar 18 further locks the ring piece 10 by using the sliding plate 16 and the insert rod 17 to prevent the ring piece 10 from loosening inside the collar 9.

[0035] Working principle of this invention: Reference Figures 1 to 6 As shown, the collar 9 is fitted onto the outside of the tailpipe 5. At this time, multiple ring pieces 10 are correspondingly snapped into the inside of the collar 9. The concave surface of the ring piece 10 is in contact with the outer circumference of the tailpipe 5, and the inclined surface 13 is in contact with the inner inclined groove 901. The screw 12 vertically penetrates the ring frame 15. At this time, the outer end face of the slide plate 16 is penetrated through the ring frame 15 by two horizontal bars 18. The screw 12 is located between the two horizontal bars 18. The two horizontal bars 18 are used by the screw 12 to limit the push plate 14. The push plate 14 is set as a circular plate. At this time, the circular plate cooperates to seal the bottom opening of the ring frame 15.

[0036] The ring frame 15 is pushed upward. The upward-moving ring frame 15 uses two crossbars 18 to push the slide plate 16 and the collar 9 upward. Since the insert rod 17 is inserted into the bottom end of the ring piece 10, when the top surface of the ring piece 10 is attached to the bottom surface of the base plate 8, the collar 9, which continues to move upward, slides on the inclined surface 13 using the inner inclined groove 901. The sliding collar 9 uses the inclined surface 13 to make multiple ring pieces 10 squeeze the soft material tail tube 5. At this time, the ring piece 10 uses the insert rod 17 to make the slide plate 16 move inward. The inward-moving slide plate 16 pulls the crossbar 18 to move. The crossbar 18 moves inside the ring frame 15 until the crossbar 18 can no longer move.

[0037] The push plate 14 and screw 12 are rotated by rotation. The rotating push plate 14 causes multiple convex plates 23 to rotate synchronously through the connecting part 22. The multiple convex plates 23 push the inner ring 19 and side frame 20 to move upward. At this time, the outer side of the side frame 20 moves upward on the inner side wall of the ring frame 15. The upward side frame 20 moves upward in the slot 181 through the locking teeth 21 until the top surface of the side frame 20 is in contact with the bottom surface of the base plate 8. The locking teeth 21 and the slot 181 cooperate to lock the crossbar 18.

[0038] The locking crossbar 18 further locks the ring plate 10 using the sliding plate 16 and the insert rod 17. The collar 9 uses multiple ring plates 10 to clamp the tail tube 5. If the tail tube 5 is made of soft material, the rotating screw 12 and the spiral engagement with the base plate 8 cause the collar 9 to move upward. At this time, the collar 9 slides on the inclined surface 13 using the inner inclined groove 901. The upward-moving collar 9 uses the inclined surface 13 to make multiple ring plates 10 approach each other. The compression of the ring plates 10 causes the tail tube 5 to deform. Under the compression of multiple ring plates 10, the stability of the tail tube 5 on the base plate 8 is ensured.

[0039] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it.

Claims

1. A prefabricated terminal for a high-voltage AC cross-linked polyethylene cable, characterized in that, It includes outgoing fittings (1), anti-corona cover (2), sleeve (3), stress cone (4), tail line (5) and insulator (6). The stress cone (4) is provided with anti-corona cover (2) at the top and outgoing fittings (1) are installed at the top of the anti-corona cover (2). The tail line (5) is connected to the bottom of the stress cone (4). The sleeve (3) is sleeved on the outside of the stress cone (4). The sleeve (3) is filled with insulating oil. The bottom of the stress cone (4) is connected to the base frame (7) by multiple insulators (6). The stress cone (4) is mounted on the base plate (8) at its bottom end using multiple screws. The bottom surface of the base plate (8) is bounded by a limiting component, which includes: The collar (9) is fitted onto the outside of the tailpipe (5); The ring plate (10) is snapped into the inner wall of the collar (9) to help clamp the tail pipe (5). Side plates (11), multiple side plates (11) are fixed to the outer circumference of the collar (9). A screw (12) passes through the side plate (11) and is used to fix a collar (9) on the bottom surface of the base plate (8).

2. The prefabricated terminal for high-voltage AC cross-linked polyethylene cable according to claim 1, characterized in that: The inner wall of the collar (9) is provided with multiple inner inclined grooves (901), and the multiple inner inclined grooves (901) correspond one-to-one with multiple ring pieces (10). The top of the outer side of the ring piece (10) is provided with an inclined surface (13).

3. The prefabricated terminal for high-voltage AC cross-linked polyethylene cable according to claim 2, characterized in that: The upward-moving collar (9) slides on the inclined plane (13) using the inner inclined groove (901) to drive the ring plate (10) to squeeze the tail line (5).

4. The prefabricated terminal for high-voltage AC cross-linked polyethylene cable according to claim 2, characterized in that: The top end of the screw (12) is screwed into the bottom surface of the base plate (8). A push plate (14) is fixed at the bottom end of the screw (12). A ring frame (15) is provided at the bottom of the base plate (8). The screw (12) uses the push plate (14) to limit the ring frame (15) at the bottom of the base plate (8).

5. The prefabricated terminal for high-voltage AC cross-linked polyethylene cable according to claim 4, characterized in that: The side plate (11) has a sliding plate (16) at the bottom. A rod (17) is fixed inside the sliding plate (16). The rod (17) is inserted into the bottom of the ring piece (10). The outer side of the sliding plate (16) is pierced through the ring frame (15) by two crossbars (18).

6. The prefabricated terminal for high-voltage AC cross-linked polyethylene cable according to claim 4, characterized in that: The push plate (14) is set as a circular plate, and the circular plate cooperates with the bottom opening of the sealing ring frame (15).

7. The prefabricated terminal for high-voltage AC cross-linked polyethylene cable according to claim 5, characterized in that: The slide plate (16) uses the insert rod (17) to lock the ring plate (10), and the top surface of the slide plate (16) is in contact with the bottom surface of the side plate (11).

8. The prefabricated terminal for high-voltage AC cross-linked polyethylene cable according to claim 4, characterized in that: The ring frame (15) is provided with a locking part for the locking crossbar (18), the locking part including: inner ring (19), side frame (20) and locking teeth (21). The bottom end of the screw (12) is connected to the push plate (14) via the connecting part (22). An inner ring (19) is sleeved on the outside of the connecting part (22). Two opposing side frames (20) are connected to the outer side of the inner ring (19). A locking tooth (21) is fixed on the top of the inner side of the side frame (20). Multiple slots (181) are opened on the surface of the crossbar (18). The locking tooth (21) is snapped into the slot (181).

9. The prefabricated terminal for high-voltage AC cross-linked polyethylene cable according to claim 8, characterized in that: The outer convex surface of the side frame (20) fits against the inner wall of the annular groove (15), and the inner side surface of the side frame (20) abuts against the outer circumferential side surface of the crossbar (18).

10. The prefabricated terminal for high-voltage AC cross-linked polyethylene cable according to claim 8, characterized in that: The connecting part (22) has multiple protrusions (23) fixed on its outer circumference, and the multiple protrusions (23) cooperate to support the inner ring (19).

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