Transformer wire clamp
By designing curvature-adapted clamping gaskets and wedge-shaped protrusions in the transformer wire clip, combining thread sleeves and locking bolts, the problems of damaged and poor contact in the prior art are solved, and the fixing capacity of the wire and the grid are improved. security.
Patent Information
- Application Number
- CN202210887788.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-07-26
- Publication Date
- 2024-12-24
- Estimated Expiration
- 2042-07-26
AI Technical Summary
When existing transformer wire clamps are fixed to the wire using torque bolts, it is easy to cause damage to the wire and break the strand, increasing the resistance and possibly causing a fire, affecting the safe operation of the power system.
A transformer wire clamp is designed, which includes wire mounting holes, fastening bolts and clamping gaskets. The curvature of the clamping gaskets adapts to the wire surface, equipped with wedge-shaped protrusions to support the wire, and the fastening bolts pass through the clamping gaskets. The sheet fixes the wire to reduce direct damage and enhances clamping force through threaded sleeves and locking bolts to ensure good contact between the wire and the clamp.
It effectively reduces wire damage, improves fixing ability and tension resistance, ensures good contact between the wire and the wire clip, reduces contact resistance, and enhances the safety of the power grid.
Smart Images
Figure CN115207652B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of power systems, and in particular to a transformer wire clamp. Background Art
[0002] The transformer wire clamp is a connection device on the transformer, and its function is to connect the transformer to the high-voltage input line and the low-voltage output line. The connection and fixation of the transformer wire pile and the conductor by the transformer wire clamp directly affects the safe operation of the power system, and has an indispensable function in the power system. At present, the existing transformer wire clamp connects the conductor end by vertically pressing the conductor downward through a torque bolt. Since the lower end of the torque bolt is flat, the compressed conductor is often damaged and broken, which not only damages the conductor, but also increases the resistance, causing serious heating in the damaged area; excessive temperature may cause fire and burn equipment, leading to power accidents. In view of the above problems, it is necessary to provide a transformer wire clamp that causes less damage to the conductor. Summary of the invention
[0003] The invention aims to provide a transformer wire clamp to solve the problem that when the existing transformer wire clamp uses torque bolts to fix the wire, the torque bolts cause the compressed wire to be damaged and broken.
[0004] In order to solve the above technical problems, the transformer wire clamp technical means adopted by the present invention is as follows: it includes a wire clamp body, one end of the wire clamp body is provided with a wire mounting hole in the length direction, the wire clamp body is also provided with a bolt hole connected to the wire mounting hole, a fastening bolt is provided in the bolt hole, a clamping gasket is provided in the wire mounting hole, the fastening bolt is used to squeeze the clamping gasket to fix the wire, the curvature of the clamping surface of the clamping gasket close to the entrance of the wire mounting hole is greater than the curvature of the surface of the wire to be clamped; the curvature of the clamping surface of the clamping gasket away from the entrance of the wire mounting hole is less than the curvature of the surface of the wire to be clamped, and a wedge-shaped protrusion embedded in the wire is provided on this section of the clamping gasket, the blade of the wedge-shaped protrusion faces in the direction away from the clamping gasket, that is, in the direction of the wire, so as to open the wire. In addition, it should be noted that the aforementioned wire surface is the bare wire surface with the insulating protective layer removed.
[0005] The transformer wire clamp of the above technical solution has the following technical advantages: the present invention has an adjustable clamping gasket, the contact area between the clamping gasket and the wire is large and the force is evenly distributed, and it is not easy to cause direct damage to the wire when the tightening bolt is used to tighten the wire. Moreover, the adjustable clamping gasket can be used for the connection of wires of different specifications, which is convenient for wire installation and is applicable to a wide range of wire diameters. The fastening bolt of the present invention preferably adopts a torque bolt, which can effectively avoid the situation where the wire is not tightened due to improper installation, and avoid affecting the safe operation of the power grid due to poor contact between the wire and the wire clamp; the wire installation hole of the wire clamp body is similar to a toothed groove, and the oxide layer on the surface of the wire can be pierced when the wire is tightened by the clamping gasket, thereby ensuring effective contact between the wire and the wire clamp and reducing the contact resistance. The design of the clamping gasket makes the opening near the entrance of the wire installation hole change from a round hole to a pear-shaped hole when the wire is tightened, thereby making the hole diameter smaller, which is conducive to the gathering of the wire, and the wire far away from the entrance of the wire installation hole is squeezed to the side wall of the wire installation hole by the wedge-shaped protrusion, which increases the contact surface between the wire and the wire clamp, and at the same time makes the wire form an enlarged end, which is difficult to escape from the entrance of the wire installation hole, effectively improving the clamping and fixing ability of the wire clamp for the wire, and improving the wire pull-out resistance of the fixed position.
[0006] As a preferred embodiment, a vertical clamping through hole is provided on the other end of the wire clamp body, and a clamping opening is also provided at the end of the wire clamp body, the clamping opening is connected to the clamping through hole, and the clamping through hole and the two sides of the clamping opening form a clamping portion for clamping the transformer pile head; the two sides of the clamping opening are connected by at least one set of locking bolts.
[0007] As a preferred solution, a thread or a threaded sleeve is provided in the clamping through hole, and the threaded sleeve is provided with a threaded sleeve opening along the busbar direction, and the size of the threaded sleeve opening is adapted to the size of the clamping opening; symmetrical raised strips are provided on both sides of the threaded sleeve opening of the threaded sleeve, and the raised strips are located in the length direction, and the clamping opening is provided with a notch groove matched with the raised strip, and the raised strip and the notch groove cooperate to limit the rotation of the threaded sleeve in the clamping through hole; the threaded sleeve provided with the threaded sleeve opening can be deformed and contracted inwardly appropriately, so as to facilitate the clamping and fixing of the transformer pile head more firmly; the raised strip on the threaded sleeve cooperates with the notch groove on the clamping opening to prevent the threaded sleeve from rotating in the clamping through hole, which is beneficial to ensure that the direction of the threaded sleeve opening is consistent with that of the clamping opening, and ensure the clamping strength of the transformer pile head; at the same time, the contact area between the wire clamp body and the threaded sleeve is maximized, thereby improving the contact reliability.
[0008] As a preferred solution, during the installation of the wire, in order to reduce the obstruction of the wire by the clamping gasket at the entrance, an arc groove structure for accommodating the clamping gasket is provided on the wire installation hole. Specifically, the wire installation hole is two partially overlapping circular holes, and the two circular holes are axially parallel. The arc groove structure is generated by one of the circular holes. This installation of a double circular hole structure can greatly reduce the difficulty of processing and forming.
[0009] As a preferred solution, the side of the clamping pad that contacts the wire is provided with teeth or convex patterns embedded in the wire. The teeth or convex patterns on the clamping pad are embedded in the wire, increasing the connection surface with the wire, thereby reducing contact resistance.
[0010] As a preferred solution, the mating surfaces of the clamping gasket and the fastening bolt are provided with a groove, and the groove can be a flat-bottomed or arc-shaped concave design, which increases the contact surface between the fastening bolt and the clamping gasket and disperses the contact pressure. At the same time, it also makes it difficult for the clamping gasket to slide along the direction of the wire with the fastening bolt under the drive of the wire after being squeezed into contact with the wire. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 It is a front view of the present invention;
[0012] Figure 2 It is a right side view of the present invention;
[0013] Figure 3 A top view of the present invention;
[0014] Figure 4 for Figure 3 AA section view in the cross section;
[0015] Figure 5 Schematic diagram of the appearance of the torque bolt in the present invention;
[0016] Figure 6 It is a schematic diagram of the appearance of the clamping gasket in the present invention.
[0017] The main components in the figure are described as follows:
[0018] 1. Wire clamp body; 2. Torque bolt; 3. Threaded sleeve; 4. Locking bolt; 5. Clamping gasket; 6. Groove; 7. Wedge-shaped protrusion; 8. Screw; 9. O-ring. DETAILED DESCRIPTION
[0019] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.
[0020] like Figure 1 , 2As shown in Figures 3, 4, 5 and 6, the transformer wire clamp includes a wire clamp body 1. A wire mounting hole is provided at the right end of the wire clamp body 1 in the length direction. The wire mounting hole is a threaded blind hole. A bolt hole connected to the wire mounting hole is also provided on the wire clamp body. A fastening bolt is provided in the bolt hole. The fastening bolt is preferably a torque bolt. A torque bolt 2 is installed in the bolt hole. The torque bolt 2 is used to fasten the wire installed in the wire mounting hole. An O-ring 9 is sleeved at the broken part of the torque head at the upper end of the torque bolt 2. The O-ring 9 can prevent the socket wrench and the wrench from being embedded under the broken part. A clamping gasket 5 for clamping and protecting the wire is arranged in the wire installation hole. The clamping gasket 5 is installed between the wire and the torque bolt 2. The curvature of the clamping surface of the clamping gasket 5 near the entrance of the wire installation hole is greater than the curvature of the bare wire surface of the wire to be clamped, so that the opening near the entrance of the wire installation hole becomes smaller, which is conducive to the gathering of the wire; the curvature of the clamping surface of the clamping gasket 5 away from the entrance of the wire installation hole is smaller than the curvature of the bare wire surface of the wire to be clamped, and a wedge-shaped protrusion 7 embedded in the wire is arranged on this section of the clamping gasket 5, and the blade of the wedge-shaped protrusion 7 faces away from the clamping gasket, so that the wire away from the entrance of the wire installation hole is squeezed to the side walls of the wire installation hole on both sides by the wedge-shaped protrusion 7, which increases the contact surface between the wire and the wire clamp, and at the same time forms an enlarged end at the end of the wire, making it difficult for it to escape from the entrance of the wire installation hole, effectively improving the connection strength of the clamped and fixed wire. The torque bolt 2 is installed in the bolt hole on the wire clamp body 1. The wire is fixed by adjusting the torque bolt 2 to squeeze the clamping gasket 5. The clamping gasket 5 is provided with teeth or convex patterns embedded in the wire on the side close to the wire. The teeth or convex patterns on the clamping gasket are embedded in the wire, which increases the connection surface with the wire, thereby reducing the contact resistance. In addition, a preferred method is to set a groove 6 for accommodating the end of the torque bolt 2 in the area corresponding to the bottom of the clamping gasket 5 and the torque bolt 2. The groove 6 can be a flat bottom or an arc-shaped concave surface. The preferred method is a flat bottom that is more convenient to process. Figure 2 As shown, a blind hole for installing the signal line is also provided at the right end of the wire clamp body 1 , and a screw hole connected to the blind hole for installing the signal line is provided on the side, and the signal line is fastened and connected by a screw 8 .
[0021] In order to facilitate the processing of the wire installation hole and reduce the obstruction of the clamping gasket at the entrance to the wire, the wire installation hole is in the form of two partially overlapping circular holes, the two circular holes are axially parallel, and one of the circular holes forms a space for accommodating the clamping gasket 5 at the entrance.
[0022] like Figure 1 and 2As shown, a vertical clamping through hole and a clamping opening at the left end are provided near the left end of the wire clamp body 1, and the clamping opening is connected to the clamping through hole. The clamping through hole and the two sides of the clamping opening form a clamping part for clamping the transformer pile head; the two sides of the clamping opening are connected by at least one set of locking bolts 4, and the locking bolts 4 are used to adjust the tightening clamping part. A threaded sleeve 3 is also provided in the clamping through hole, and the threaded sleeve 3 is provided with a threaded sleeve opening along the busbar direction, and the size of the threaded sleeve opening is adapted to the size of the clamping opening. Symmetrical raised strips are provided on both sides of the threaded sleeve opening of the threaded sleeve 3, and the raised strips are located in the length direction. The clamping opening is provided with a notch groove matched with the raised strip, and the raised strip and the notch groove are matched to limit the rotation of the threaded sleeve 3 in the clamping through hole. The two ends of the opening of the wire clamp body are respectively provided with a bald through hole and a threaded through hole for installing the locking bolt 4. The opening ends of the wire clamp body 1 are respectively provided with a bald through hole and a threaded through hole for installing the locking bolt 4; the locking bolt 4 cooperates with the threaded through hole, and the bolt head squeezes one side of the bald through hole to drive the extrusion of both sides of the bald through hole and the threaded through hole. There are two groups of locking bolts 4, and the installation directions of the two groups of locking bolts 4 are opposite; the two groups of holes for fixing the locking bolts are staggered, so that the fixing force of the transformer pile head can be more uniform.
[0023] The wire clamp body 1, torque bolt 2, threaded sleeve 3, and clamping gasket 5 are all made of high-strength, non-magnetic, and highly conductive aluminum alloy materials. In order to improve corrosion resistance and conductivity, the surfaces of the wire clamp body 1, torque bolt 2, threaded sleeve 3, and clamping gasket 5 are provided with a protective coating.
[0024] As a preferred solution, in order to avoid the clamping gasket 5 from being lost and also to avoid the clamping gasket 5 from tilting and blocking the insertion of the wire, the clamping gasket 5 can be riveted to the center position of the end of at least one fastening bolt, and the clamping gasket 5 can be pre-positioned by the fastening bolt.
[0025] Working principle and process: 1. Installation process: First, screw the threaded sleeve 3 into the transformer pile head through the thread, insert the wire clamp into the threaded sleeve 3, tighten it by the locking bolt, and clamp the wire clamp body 1 on the transformer pile head; secondly, insert the wire into the wire installation hole, tighten the torque bolt 2, and during the downward pressing process of the torque bolt 2, drive the clamping gasket 5 to move downward until the torque head at the upper end of the torque bolt 2 is twisted off, and the wire is compressed by squeezing the clamping gasket 5. If the signal line needs to be installed, crimp the signal line with the screw 8. 2. Disassembly process: Due to inspection and maintenance, when replacing the wire, first, loosen the torque bolt 2 upward in the opposite direction. After the clamping gasket 5 is loosened, the wire can be moved and pulled out relative to it; if the entire transformer wire clamp needs to be replaced, continue the above operation, loosen the screw 8 to remove the signal line, then loosen the locking bolt, remove the wire clamp, and unscrew the threaded sleeve 3 to complete the disassembly.
[0026] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.
Claims
1. A transformer wire clamp, comprising a wire clamp body, one end of the wire clamp body is provided with a wire installation hole in the length direction, the wire clamp body is also provided with a bolt hole connected with the wire installation hole, a fastening bolt is provided in the bolt hole, and the characteristics are: A clamping gasket is provided in the wire installation hole, and the fastening bolt is used to squeeze the clamping gasket to fix the wire. The curvature of the clamping surface of the clamping gasket close to the entrance of the wire installation hole is greater than the curvature of the surface of the wire to be clamped; the curvature of the clamping surface of the clamping gasket away from the entrance of the wire installation hole is less than the curvature of the surface of the wire to be clamped, and a wedge-shaped protrusion embedded in the wire is provided on this section of the clamping gasket, and the blade of the wedge-shaped protrusion faces the direction away from the clamping gasket.
2. A transformer clamp according to claim 1, characterized in that: A vertical clamping through hole is provided on the other end of the wire clamp body, and a clamping opening is also provided at the end of the wire clamp body. The clamping opening is connected to the clamping through hole, and the clamping through hole and the two sides of the clamping opening form a clamping portion for clamping the transformer pile head; at least one set of locking bolts are provided on both sides of the clamping opening.
3. A transformer clamp according to claim 2, characterized in that: A thread or a threaded sleeve is provided in the clamping through hole, and the threaded sleeve is provided with a threaded sleeve opening along the generatrix direction, and the size of the threaded sleeve opening is adapted to the size of the clamping opening; symmetrical raised strips are provided on both sides of the threaded sleeve opening of the threaded sleeve, and the raised strips are located in the length direction, and the clamping opening is provided with a notch groove cooperating with the raised strip, and the raised strip cooperates with the notch groove to limit the rotation of the threaded sleeve in the clamping through hole.
4. A transformer clamp according to claim 1, characterized in that: The wire installation hole is two partially overlapped circular holes, and the two circular holes are axially parallel.
5. The transformer clamp according to claim 1, characterized in that: The side of the clamping pad that contacts the wire is provided with teeth or convex patterns embedded in the wire.
6. The transformer clamp according to claim 1, characterized in that: The matching surfaces of the clamping gasket and the fastening bolt are provided with grooves.