Power cable for overhead power lines

Abstract

This invention relates to a power cable for overhead transmission lines applied in the field of cables. By laying a snow removal line along the same length of the cable body, and positioning both ends of the snow removal line on the cable body using double-ring members, and by inflating the double-ring members and the snow removal line with air, the snow removal line is inflated and rotated, achieving a near-full-length snow removal effect on the cable body between towers. Compared to existing methods that use a snow removal mechanism moving along the surface of the cable body, this invention improves the snow removal rate while maintaining the snow removal effect. Furthermore, the double-ring members and hollow snow removal line do not easily increase the load on the cable body. During snow removal, since there is no need to move along the length of the cable body, it is less likely to cause increased sag of the cable body or frictional damage to the cable body surface.

Description

Technical Field

[0001] The present invention relates to a power cable, and more particularly to a power cable for overhead transmission lines used in the field of cables. Background Technology

[0002] Overhead cables (full name: overhead insulated cables) are overhead conductors equipped with insulation layers and protective sheaths. Overhead cables can be installed on any type of pole or tower, or along walls, and in special cases, they can even run through bushes and be directly fixed to tree trunks with hardware.

[0003] When overhead cables are laid in areas with frequent rain and snow in winter, they are often damaged or even broken due to excessive snow accumulation, resulting in power outages.

[0004] To address the aforementioned problems, Chinese Patent CN107947088B discloses a cable snow removal device, comprising a wind-facing tube fitted onto the cable, two end caps fixedly installed at both ends of the wind-facing tube, two annular sliding rings disposed at both ends of the inner wall of the wind-facing tube, and multiple long connecting rods connected between the two sliding rings. This invention causes snow to fall from the fan blades during rotation and simultaneously scrapes snow off the cable as the wind-facing tube moves; when subjected to wind force, it can accelerate the rotation and movement speed of the wind-facing tube, thereby increasing snow removal efficiency. For example, Chinese patent CN115910468B discloses an overhead insulated cable. By setting conductive wires in the second insulation layer, power can be arranged on the transmission frame, and the first motor in each mounting box can be powered through the conductive wires. This allows multiple mounting boxes and snow removal components to be arranged on the overhead insulated cable between two adjacent transmission frames. On the other hand, by eccentrically connecting the winding member to the first motor, the present invention enables the winding member to periodically drive the traction rope and the snow removal component connected to it to swing when winding the traction rope. This avoids the snow removal component from compacting the snow in front of it and affecting its movement.

[0005] Existing cables with snow removal structures or dedicated snow removal devices for cables mostly use a moving method to clear snow from the cable. This method not only significantly increases the cable load but also leads to increased cable sag and surface damage from dynamic friction caused by the snow removal structure, thereby affecting the cable's service life and data transmission stability. Summary of the Invention

[0006] The technical problem that this invention aims to solve in view of the above-mentioned prior art is that the existing snow removal methods for cables not only seriously increase the cable load, but also cause the cable sag to increase and the surface to be damaged by dynamic friction of the snow removal structure, thereby affecting the service life of the cable and the stability of data transmission.

[0007] To address the aforementioned problems, this invention provides a power cable for overhead transmission lines, comprising a cable body, characterized in that: a snow removal line is provided on the outer side of the cable body along its laying direction, and a double-ring component is connected to both ends of the snow removal line. The double-ring component includes a main inner ring, a secondary inner ring, a main outer ring, and a secondary outer ring. The main inner ring and the secondary inner ring form a small ring structure and are fitted onto the outer end of the cable body. The main outer ring and the secondary outer ring form a large ring structure and are rotatably fitted onto the outer end of the small ring structure. The large ring structure and the small ring structure are in a surface contact sealed state. In the initial state, the main outer ring is located outside the main inner ring, and the secondary outer ring is located outside the secondary inner ring.

[0008] A fixed piston plate is fixedly connected to the outer end of the inner ring, and a movable piston plate is fixedly connected to the inside of the outer ring. An air supply pipe is connected to the side end of the inner ring, and the end of the air supply pipe away from the inner ring is fixedly connected to the air outlet of the air pump. The end of the snow removal line is connected to the outer ring and communicates with its interior.

[0009] As a further supplement to this application, the end of the gas pipeline near the inner ring is fixedly connected to a pipe head, and the two ends of the snow removal line are fixedly connected to a gas pipe 1 threadedly connected to the pipe head. The inner ring has a gas channel connecting the gas pipe 1 and the inner ring, and the outer end of the inner ring is fixedly connected to an inner limiting plate.

[0010] As a further supplement to this application, when the inner ring and outer ring are fully engaged, the fixed piston plate is located inside the outer ring and is in contact with its inner wall in a sealed state, the end of the moving piston plate away from the outer ring is in contact with the outer end of the inner ring in a sealed state, the gas passage is located between the fixed piston plate and the moving piston plate, and the inner limiting plate is located between the gas passage and the moving piston plate.

[0011] As a further supplement to this application, both ends of the snow removal line are fixedly connected to connector pipes, and the side end of the secondary outer ring is fixedly connected to an air pipe two that is threadedly connected to the connector pipe. The air pipe two extends into the interior of the secondary outer ring and is located between the fixed piston plate and the moving piston plate.

[0012] As a further supplement to this application, the main outer ring is provided with an air hole that connects its interior to the outside. An outer limiting plate is fixedly connected to the inner wall of the main outer ring, and the outer limiting plate is located at one edge of the air hole.

[0013] As a further supplement to this application, a pair of inner mounting plates are fixedly connected to the planar side ends of both the main inner ring and the secondary inner ring, and the pair of inner mounting plates are connected by fasteners.

[0014] As a further supplement to this application, the arc-shaped outer ends of both the main outer ring and the secondary outer ring are fixedly connected to an outer mounting plate, and the outer mounting plates are connected to each other by fasteners.

[0015] As another improvement of this application, the snow removal line has multiple evenly distributed slits, and a ring plate is fixedly connected inside the slit. Multiple rubber sheets are fixedly connected to the inner wall of the ring plate, and the multiple rubber sheets form a complete circular structure. A magnetic coating is applied to the surface of adjacent rubber sheets that are close to each other.

[0016] In summary, this application achieves near-full-length snow removal by laying snow removal lines along the cable body and positioning both ends of the snow removal lines on the cable body using double-ring components. By inflating the double-ring components and the snow removal lines with air, the snow removal lines inflate and rotate, thus achieving near-full-length snow removal for the cable body between towers. Compared to existing methods that rely on snow removal mechanisms moving along the surface of the cable body, this application improves the snow removal rate while maintaining the snow removal effect. Furthermore, the use of double-ring components and hollow snow removal lines minimizes the load on the cable body. Additionally, since there is no need to move along the length of the cable body during snow removal, it is less likely to cause increased sag on the cable body or frictional damage to the cable surface. Attached Figure Description

[0017] Figure 1 This is a partial perspective view of the first embodiment of this application;

[0018] Figure 2 This is a partial three-dimensional view of the disassembly of one of the double-ring components in the first embodiment of this application. Figure 1 ;

[0019] Figure 3 This is a partial three-dimensional view of another double-ring component during disassembly according to the first embodiment of this application. Figure 2 ;

[0020] Figure 4 This is a partial side view of the first embodiment of this application;

[0021] Figure 5 This is a front view of one of the double-ring components in the first embodiment of this application when it is not inflated.

[0022] Figure 6 This is a schematic diagram of the front structure of one of the double-ring components in the first embodiment of this application during inflation. Figure 1 ;

[0023] Figure 7 This is a schematic diagram of the front structure of one of the double-ring components in the first embodiment of this application during inflation. Figure 2 ;

[0024] Figure 8 This is a front view of another double-ring component in the first embodiment of this application when it is not inflated.

[0025] Figure 9 This is a front view of another double-ring component in the first embodiment of this application when it is inflated.

[0026] Figure 10 This is a perspective view showing the changes during inflation in the first embodiment of this application.

[0027] Figure 11 This is a schematic diagram of a partial top surface structure of the snow removal line in the second embodiment of this application;

[0028] Figure 12 This is a partial side view of the snowplow line during inflation in the second embodiment of this application.

[0029] Explanation of the labels in the diagram:

[0030] 1. Cable body, 2. Snow removal line, 201. Connector pipe, 3. Double ring, 41. Main inner ring, 42. Secondary inner ring, 4201. Gas channel, 51. Main outer ring, 5101. Air hole, 52. Secondary outer ring, 6. Gas pipe, 601. Pipe head, 7. Fixed piston plate, 8. Moving piston plate, 9. Outer mounting plate, 10. Inner mounting plate, 11. Multi-lobed body, 1101. Ring plate, 1102. Rubber sheet, 1103. Magnetic coating, 12. Outer limiting plate, 13. Inner limiting plate. Detailed Implementation

[0031] The two embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0032] Implementation method 1:

[0033] This invention provides a power cable for overhead transmission lines. Please refer to [link / reference]. Figure 1 The cable includes a cable body 1. A snow removal line 2 is installed on the outer side of the cable body 1 along its laying direction. The snow removal line 2 is an airtight, hollow, soft-sleeved structure made of non-elastic material. When deflated, it is wrinkled; when inflated, it is full and bulging. Both ends of the snow removal line 2 are connected to double-ring fittings 3. Please refer to [link / reference]. Figure 2 The double-ring component 3 includes a main inner ring 41, a secondary inner ring 42, a main outer ring 51, and a secondary outer ring 52. The main inner ring 41 and the secondary inner ring 42 form a small ring structure and are fitted onto the outer end of the cable body 1. The inner surfaces of the main inner ring 41 and the secondary inner ring 42 are fixedly connected with a rubber elastic layer (not shown in the figure), so that the small ring structure formed by the main inner ring 41 and the secondary inner ring 42 can tightly wrap around the cable body 1 and is not easy to move on the cable body 1. The main outer ring 51 and the secondary outer ring 52 form a large ring structure and are rotatably fitted onto the outer end of the small ring structure. The large ring structure and the small ring structure are in a surface contact sealed state. The contact surfaces of the two are coated with a smooth coating to facilitate the rotation between them. The inner ends of the main outer ring 51 and the secondary outer ring 52 are hollow.

[0034] Please see Figure 2A fixed piston plate 7 is fixedly connected to the outer end of the inner ring 42, and a movable piston plate 8 is fixedly connected to the inside of the outer ring 52. An air supply pipe 6 is connected to the side end of the inner ring 42. Specifically, a pipe head 601 is fixedly connected to the end of the air supply pipe 6 near the inner ring 42. An air pipe 1 threadedly connected to the pipe head 601 is fixedly connected to both ends of the snow removal line 2. An air outlet end of the air supply pipe 6 away from the inner ring 42 is fixedly connected to the air pump. A gas channel 4201 connecting the air pipe 1 and the inside of the outer ring 52 is opened inside the inner ring 42. An inner limiting plate 13 is fixedly connected to the outer end of the inner ring 42. The end of the snow removal line 2 is connected to the outer ring 52 and communicates with its interior. When the air pump is started, air can be transmitted to the interior of the outer ring 52 through the air supply pipe 6 and the gas channel 4201 in sequence, and then enter the snow removal line 2 to inflate the snow removal line 2.

[0035] Combination Figure 4 As shown, a pair of double-ring components 3 are respectively installed on the cable body 1 near the tower. On the one hand, this makes it convenient to install the air pump on the nearby tower. On the other hand, it allows the snow removal line 2 between the pair of double-ring components 3 to approach the distance between the pair of towers, making it convenient to carry out a snow removal process of nearly the entire length of the cable body 1 between the pair of towers.

[0036] In the initial state, the main outer ring 51 is located outside the main inner ring 41, and the secondary outer ring 52 is located outside the secondary inner ring 42. When the secondary inner ring 42 and the secondary outer ring 52 are fully engaged, the fixed piston plate 7 is located inside the secondary outer ring 52 and is in contact with its inner wall in a sealed state. At the same time, the fixed piston plate 7 also plays a limiting role for the secondary outer ring 52, making it difficult for the secondary outer ring 52 and the main outer ring 51 to detach from the main inner ring 41 and the secondary inner ring 42, and also enabling stable rotation. The end of the moving piston plate 8 away from the secondary outer ring 52 is in contact with the outer end of the secondary inner ring 42 in a sealed state. The gas passage 4201 is located between the fixed piston plate 7 and the moving piston plate 8. The inner limiting plate 13 is located between the gas passage 4201 and the moving piston plate 8. Both ends of the snow removal line 2 are fixedly connected to the connector pipe 201. The side end of the secondary outer ring 52 is fixedly connected to the second air pipe, which is threadedly connected to the connector pipe 201. The second air pipe extends into the interior of the secondary outer ring 52 and is located between the fixed piston plate 7 and the moving piston plate 8.

[0037] Combination Figure 2 , Figure 5 and Figure 6As shown, since the gas channel 4201 and the gas pipe 201 connected to the connector pipe are both located between the fixed piston plate 7 and the moving piston plate 8, the gas directly accumulates between the fixed piston plate 7 and the moving piston plate 8 through the gas channel 4201, which facilitates the concentrated entry into the snow removal line 2 through the gas pipe 2 and the connector pipe 201, making it less likely to leak to other places, effectively realizing the inflation of the snow removal line 2, and preparing for the subsequent snow removal process. When the snow removal line 2 is inflated to near its maximum state, as the air pump continues to run, the air pressure in the fixed piston plate 7 and the moving piston plate 8 continues to increase. At this time, under the action of air pressure, the moving piston plate 8 will be forced to drive the secondary outer ring 52 and the main outer ring 51 to rotate, thereby driving the fully inflated snow removal line 2 to rotate on the upper side of the cable body 1, breaking the snow accumulation at its upper end, and realizing the effective snow removal process of the cable body 1.

[0038] Compared with existing snow removal methods, the advantages of this application are as follows: On the one hand, it achieves a near-full-length snow removal effect on the cable body 1 between towers. Compared with the method of removing snow by moving the snow removal mechanism along the surface of the cable body 1, this application effectively ensures the snow removal effect and improves the snow removal rate. On the other hand, the snow removal line 2 and the double ring 3 can be freely assembled and disassembled on the cable body 1. The double ring 3 is set near the tower of the cable body 1. The double ring 3 and the hollow snow removal line 2 do not easily increase the load on the cable body 1. Furthermore, during the snow removal process, since there is no need to move along the laying direction of the cable body 1, it is not easy to cause an increase in the sag of the cable body 1, nor is it easy to cause friction damage to the surface of the cable body 1.

[0039] The main outer ring 51 has an air hole 5101 connecting its interior to the outside. An outer limiting plate 12 is fixedly connected to the inner wall of the main outer ring 51, and the outer limiting plate 12 is located at one edge of the air hole 5101. When the moving piston plate 8, the main outer ring 51, and the auxiliary outer ring 52 rotate, the gas in the area of ​​the moving piston plate 8 away from the connector pipe 201 can be released to the outside through the air hole 5101, facilitating the maintenance of air pressure balance in that area, thereby ensuring the smooth rotation of the moving piston plate 8, the main outer ring 51, and the auxiliary outer ring 52. Note: (The last sentence appears to be incomplete and possibly contains errors.) Figure 5 As shown, when installing the main outer ring 51, the vent 5101 is positioned away from the moving piston plate 8. At this time, the outer limiting plate 12 is located between the vent 5101 and the fixed piston plate 7. This allows for a larger rotation angle for both the main outer ring 51 and the auxiliary outer ring 52, and the outer limiting plate 12 can limit their maximum rotation angle. Figure 7 As shown, when the outer limiting plate 12 abuts against the fixed piston plate 7, both stop rotating, which facilitates the rotation of the main outer ring 51 and the auxiliary outer ring 52 when the air pump reverses later. At the same time, the setting of the inner limiting plate 13 can prevent the main outer ring 51 and the auxiliary outer ring 52 from rotating excessively, so as not to affect the next snow removal process of this application.

[0040] Both the main inner ring 41 and the secondary inner ring 42 have a pair of inner mounting plates 10 fixedly connected to their planar side ends. The pair of inner mounting plates 10 are connected by fastener one. Both the main outer ring 51 and the secondary outer ring 52 have a pair of outer mounting plates 9 fixedly connected to their arc-shaped outer ends. The pair of outer mounting plates 9 are connected by fastener two. Fastener one and fastener two both use bolts and nuts. The above structure realizes the installation and disassembly process of the snow removal line 2 and the double ring 3 on the cable body 1. For example, in non-cold weather, there is no need to install the snow removal line 2 and the double ring 3 and their related structures. In severe cold weather, the installation process of the double ring 3 is as follows:

[0041] The main inner ring 41 and the secondary inner ring 42 are arranged into a small ring structure and fitted onto the outer end of the cable body 1. Then, the two are fixed to the cable body 1 by fastener one. The main outer ring 51 and the secondary outer ring 52 are respectively fitted onto the outer ends of the main inner ring 41 and the secondary inner ring 42. The fixed piston plate 7 is inserted into the inner of the secondary outer ring 52. Then, the main outer ring 51 and the secondary outer ring 52 are connected to each other by fastener two, so that they are rotatably set at the outer ends of the main inner ring 41 and the secondary inner ring 42.

[0042] Among them, the pair of double ring parts 3 and snow removal line 2 have two settings. The first is as follows: Figures 1-3 As shown, a pair of double-ring components 3 are arranged in a centrally symmetrical manner, such that the main outer rings 51 at both ends of the cable body 1 are located on different sides of the cable body 1, and the secondary outer rings 52 at both ends are also located on different sides of the cable body 1. When connecting the snow removal line 2, the snow removal line 2 will be obliquely positioned on the upper side of the cable body 1. When the air pump starts, the rotation direction of the large ring structure formed by the main outer rings 51 and secondary outer rings 52 at both ends is opposite (in conjunction with...). Figures 6-9 As shown), through its rotation process, the position of the snow removal line 2 on the cable body 1 first moves from a forward inclined state to a state in the same direction as the cable body 1, and then continues to move to a reverse inclined state, combined with Figure 10 As shown, through this movement process, the snow on the upper side of the cable body 1 is effectively removed; the second method: a pair of double ring parts 3 are set in an axisymmetric manner (not shown in the figure). At this time, the snow removal line 2 is parallel to the cable body 1 and located on the horizontal side of the cable body 1 (here it is set as: the left side). When the main outer ring 51 and the auxiliary outer ring 52 rotate, they will drive the snow removal line 2 to move from the left side of the cable body 1 to the upper side of the cable body 1, and then from the upper side of the cable body 1 to the right side of the cable body 1, which also achieves effective removal of the snow on the upper side of the cable body 1.

[0043] After the snow has been completely removed, the air pump can be reversed to extract the gas inside the snow removal line 2 and the secondary outer ring 52, restoring them to their initial state and position.

[0044] Additional explanation: The air pump on the tower is connected to the control terminal. A snow depth sensor can also be installed on the tower. By combining existing weather forecasting technology with snow depth sensor data, it can be determined whether snow removal is needed on the cable body 1. When the data determines that snow removal is needed, the control terminal automatically starts the air pump and makes it run according to the predetermined program until it is shut down.

[0045] The second implementation method:

[0046] This embodiment adds the following to the first embodiment: Please refer to Figure 11 and Figure 12 The snow removal line 2 has multiple evenly distributed cuts. A ring plate 1101 is fixedly connected inside the cut. Multiple rubber sheets 1102 are fixedly connected to the inner wall of the ring plate 1101. The multiple rubber sheets 1102 form a complete circular structure. A magnetic coating 1103 is coated on the surfaces of adjacent rubber sheets 1102 that are close to each other.

[0047] With the above structure, when the main outer ring 51 and the secondary outer ring 52 rotate to their maximum angle under the air pump's inflation action (i.e., the outer limit plate 12 abuts against the fixed piston plate 7), as the air pump continues to move, it continuously inflates the secondary outer ring 52 and the snow removal line 2. At this time, the excessive air pressure will force the rubber sheet 1102 to overcome its own elasticity and the magnetic attraction between the magnetic coatings 1103, causing it to bend and deform outward, forming a gas outlet between the multiple rubber sheets 1102. The gas in the snow removal line 2 can be released to the outside through this outlet, which will blow away the snow on the cable body 1, thereby further improving the snow removal effect of this application.

[0048] Additional explanation: When the air pump reverses, the rubber sheet 1102 will first return to its initial state. However, due to its own elasticity and the magnetic attraction of the magnetic coating 1103, it is not easy for it to bend into the snow removal line 2. This causes the air pump to first draw gas from the snow removal line 2 and the secondary outer ring 52, causing the snow removal line 2 to collapse and the main outer ring 51 and the secondary outer ring 52 to rotate back to their initial state.

[0049] In light of current practical needs, the above-described embodiments adopted in this application are not limited to these. Any changes made within the scope of knowledge possessed by those skilled in the art without departing from the concept of this application still fall within the protection scope of this invention.

Claims

1. A power cable for overhead transmission lines, comprising a cable body (1), characterized in that: Snow removal line (2) is provided on the outer side of the cable body (1) along its laying direction. Both ends of the snow removal line (2) are connected to double ring components (3). The double ring component (3) includes a main inner ring (41), a secondary inner ring (42), a main outer ring (51), and a secondary outer ring (52). The main inner ring (41) and the secondary inner ring (42) form a small ring structure and are sleeved on the outer end of the cable body (1). The main outer ring (51) and the secondary outer ring (52) form a large ring structure and are rotatably sleeved on the outer end of the small ring structure. The large ring structure and the small ring structure are in a surface contact and sealed state. In the initial state, the main outer ring (51) is located outside the main inner ring (41), and the secondary outer ring (52) is located outside the secondary inner ring (42). A fixed piston plate (7) is fixedly connected to the outer end of the inner ring (42), a movable piston plate (8) is fixedly connected to the inside of the outer ring (52), an air supply pipe (6) is connected to the side end of the inner ring (42), and the end of the air supply pipe (6) away from the inner ring (42) is fixedly connected to the air outlet of the air pump. The end of the snow removal line (2) is connected to the outer ring (52) and communicates with its interior. The gas pipe (6) is fixedly connected to a pipe head (601) at one end near the inner ring (42). The two ends of the snow removal line (2) are fixedly connected to a gas pipe threaded to the pipe head (601). The inner ring (42) has a gas channel (4201) connecting the gas pipe and the inner ring (52). The outer end of the inner ring (42) is fixedly connected to an inner limiting plate (13). The gas channel (4201) is located between the fixed piston plate (7) and the moving piston plate (8). The inner limiting plate (13) is located between the gas channel (4201) and the moving piston plate (8). The outer ring (51) has an air hole (5101) connecting its interior to the outside. The inner wall of the outer ring (51) is fixedly connected to an outer limiting plate (12), and the outer limiting plate (12) is located at one edge of the air hole (5101).

2. The power cable for overhead transmission lines according to claim 1, characterized in that: When the inner ring (42) and outer ring (52) are fully engaged, the fixed piston plate (7) is located inside the outer ring (52) and is in contact with its inner wall in a sealed state, and the end of the moving piston plate (8) away from the outer ring (52) is in contact with the outer end of the inner ring (42) in a sealed state.

3. The power cable for overhead transmission lines according to claim 1, characterized in that: Both ends of the snow removal line (2) are fixedly connected to the connector pipe (201). The side end of the secondary outer ring (52) is fixedly connected to the air pipe two, which is threadedly connected to the connector pipe (201). The air pipe two extends into the interior of the secondary outer ring (52) and is located between the fixed piston plate (7) and the moving piston plate (8).

4. The power cable for overhead transmission lines according to claim 1, characterized in that: The planar side ends of the main inner ring (41) and the secondary inner ring (42) are each fixedly connected to a pair of inner mounting plates (10), and the pair of inner mounting plates (10) are connected by fasteners.

5. A power cable for overhead transmission lines according to claim 1, characterized in that: The outer ends of the main outer ring (51) and the secondary outer ring (52) are each fixedly connected to an outer mounting plate (9), and the pair of outer mounting plates (9) are connected by fasteners.

6. A power cable for overhead transmission lines according to claim 1, characterized in that: The snow removal line (2) has multiple evenly distributed cuts. A ring plate (1101) is fixedly connected inside the cut. Multiple rubber sheets (1102) are fixedly connected to the inner wall of the ring plate (1101). The multiple rubber sheets (1102) form a complete circular structure. A magnetic coating (1103) is applied to the surfaces of adjacent rubber sheets (1102) that are close to each other.

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