Flow guide type pre-stranded wire clamp

Abstract

The application belongs to the technical field of wire clamps, and discloses a flow guide type pre-stranding wire clamp, which comprises rubber gaskets, metal pre-stranding wires and a metal sheath. Two rubber gaskets are installed on external wires, the rubber gaskets are put into the metal sheath after being wound with the metal pre-stranding wires, the longitudinal section spline curve of the inner surface of the metal sheath is consistent with the longitudinal section spline curve of the outer surface of the rubber gasket, the interval distance between the two spline curves is the diameter of the metal pre-stranding wire, the metal sheath is provided with first limiting blocks at both ends, the rubber gasket is provided with second limiting blocks at both ends, and the number of the first limiting blocks and the second limiting blocks is consistent with the number of the metal pre-stranding wires. The first limiting blocks of the metal sheath and the second limiting blocks of the rubber gasket can limit the pre-stranding wires and prevent the pre-stranding wires from being displaced. In addition, the contact area of the first limiting blocks, the second limiting blocks and the metal pre-stranding wires is small, the error existing in the metal pre-stranding wires can be accommodated, thereby facilitating installation and guaranteeing the stability of electrical connection.

Description

Technical Field

[0001] This utility model relates to the field of wire clamp technology, and in particular to a flow-guiding pre-twisted wire clamp. Background Technology

[0002] Wire clamps are iron or aluminum metal accessories that can be fixed to conductors. Most of them need to withstand significant tensile forces during operation, and some also need to ensure good electrical contact. Wire clamps are mainly classified as: equipment clamps, fusion clamps, wire holding clamps, terminal clamps, piercing grounding clamps, tightening clamps, insulating piercing clamps, double-ended clamps, and drop-in clamps, etc.

[0003] Chinese utility model patent CN220447699U discloses an electrical connection type support clamp. It includes a rubber pad, pre-twisted metal wire, and a metal sheath with grooves. The metal sheath includes a first base and a top cover plate, the top cover plate being connected to the first base. Several grooves are formed on the metal sheath, and the pre-twisted metal wire is embedded in the grooves.

[0004] Regarding the aforementioned technologies, the inventors believe the following drawbacks exist: The method of adding channels to the metal sheath places high demands on the installation personnel's skills during actual implementation. Furthermore, errors generated during production and installation accumulate, making it difficult to achieve a perfect fit between the channels and the pre-twisted metal wires during installation, increasing the difficulty of installation and hindering the achievement of the desired installation effect. Utility Model Content

[0005] To solve the above problems, this utility model provides a flow-guiding pre-twisted wire clamp.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a current-guiding pre-twisted wire clamp, comprising a rubber pad, a metal pre-twisted wire, and a metal sheath. Two rubber pads are installed on the external conductor. After the metal pre-twisted wire is wrapped around the rubber pad, it is placed in the metal sheath. The longitudinal section spline curve of the inner surface of the metal sheath is consistent with the longitudinal section spline curve of the outer surface of the rubber pad. The distance between the two spline curves is the diameter of the metal pre-twisted wire. A first limiting block is provided at both ends of the metal sheath, and a second limiting block is provided at both ends of the rubber pad. The number of the first limiting block and the second limiting block is consistent with the number of metal pre-twisted wires.

[0007] By adopting the above technical solution, which includes a rubber gasket, pre-twisted metal wire, and a metal sheath, with the interval between the two spline curves equal to the diameter of the pre-twisted metal wire, a tight fit between the pre-twisted metal wire and the metal sheath is ensured, significantly reducing contact resistance and improving current conduction performance. Simultaneously, the first limiting block of the metal sheath and the second limiting block of the rubber gasket can limit the pre-twisted wire, preventing its displacement. Furthermore, the small contact area between the first and second limiting blocks and the pre-twisted metal wire allows for the accommodation of errors present in the pre-twisted metal wire, thus facilitating installation and ensuring the stability of the electrical connection.

[0008] Furthermore, the length of the metal sheath is less than the length of the rubber pad, and the distance from the first limiting block to the middle of the metal sheath is less than the distance from the second limiting block to the middle of the rubber pad.

[0009] By adopting the above technical solution, the length of the metal sheath is set to be less than the length of the rubber pad, which can avoid excessive compression between the metal sheath, the metal pre-twisted wire and the end of the rubber pad, reduce stress concentration during installation, and at the same time reserve a certain deformation space for the rubber pad to ensure that the components can still maintain stable fit under different working conditions, such as thermal expansion and contraction caused by temperature changes, and extend the service life of the clamp.

[0010] Furthermore, the first limiting block has a triangular cross-section, and the height from the bottom to the top of the triangle is less than the diameter of the spiral metal pre-twisted wire.

[0011] By adopting the above technical solution, the cross-section of the first limiting block is set as a triangle, and the height is less than the diameter of the metal pre-twisted wire. This not only helps the metal pre-twisted wire to be quickly positioned and installed by the guidance of the triangular structure, but also avoids excessive friction or compression between the limiting block and the metal pre-twisted wire due to excessive height, thus ensuring the structural integrity of the pre-twisted wire. At the same time, it does not affect the bonding effect between the pre-twisted wire and the metal sheath, further ensuring the stability of the flow.

[0012] Furthermore, the cross-section of the second limiting block is rectangular, and the height of the rectangle is less than the diameter of the spiral metal pre-twisted wire.

[0013] By adopting the above technical solution, the cross-section of the second limiting block is set to a rectangle, and the height is less than the diameter of the metal pre-twisted wire. The rectangular structure can provide stable lateral support for the metal pre-twisted wire, prevent it from shifting left and right during the winding process, and ensure that the pre-twisted wire is evenly arranged. The height design avoids interference with the fit between the pre-twisted wire and the metal sheath, allowing the pre-twisted wire to naturally fit the surface of the rubber pad and ensure the smooth flow path.

[0014] Furthermore, an arc-shaped metal liner is provided inside the rubber liner, and a protrusion is provided on the metal liner corresponding to the second limiting block, and a through hole is provided on the protrusion.

[0015] By adopting the above technical solution, the arc-shaped metal liner inside the rubber liner enhances the overall structural strength and prevents the rubber liner from deforming due to long-term stress.

[0016] Furthermore, the metal sheath includes a first base and a first pressure cap. The first base is provided with two concentrically arranged fixing posts, and a fixing shaft is concentrically arranged on the fixing posts. A rotating ring is rotatably sleeved on the fixing shaft. The first pressure cap is connected to the two rotating rings. A lower ear plate is provided on the side of the first base away from the fixing posts, and an upper ear plate is provided on the side of the first pressure cap away from the rotating rings. A first round hole is provided on both the lower ear plate and the upper ear plate. The lower ear plate and the upper ear plate are locked together by bolts.

[0017] By adopting the above technical solution, a first base and a first pressure cover are set up. The first base and the first pressure cover are rotatably connected by a fixed column, a fixed shaft and a rotating ring, so that the first pressure cover can be flexibly opened and closed around the first base, simplifying the installation operation. The lower ear plate of the first base and the upper ear plate of the first pressure cover are locked by bolts, which can quickly fix the two together, ensure the stable clamping force of the metal sheath on the internal components, and improve the installation and maintenance efficiency of the wire clamp.

[0018] Furthermore, a first connecting hole is provided on the side of the first base away from the lower ear plate, and a bolt is provided in the first connecting hole. Support tubes are respectively provided on the bottom surface of the first base corresponding to the first connecting hole and on the bottom surface of the lower ear plate corresponding to the first round hole.

[0019] By adopting the above technical solution, a first connecting hole and a support tube are provided. The support tube is used to support the first base. The bolt component includes a bolt and a nut. One bolt passes through the first connecting hole, the support tube, and the fixing hole of the mounting base and is connected to the nut. Another bolt passes through the first round hole, the support tube, and the fixing hole of the mounting base and is connected to the nut.

[0020] Furthermore, the metal sheath includes a second base and a second pressure cap, with the second base and the second pressure cap respectively fixed on both sides by two bolts.

[0021] Furthermore, the metal sheath includes a third base and a third pressure cap hinged thereto, the third base and the third pressure cap being fixed away from the hinge by bolts.

[0022] Furthermore, the metal sheath includes a fourth base, a fourth pressure cap, and an elastic U-shaped member. The fourth base and the fourth pressure cap are fitted inside the elastic U-shaped member, and the upper part of the elastic U-shaped member is fixed by bolts.

[0023] In summary, this utility model has the following beneficial effects: In this application, a rubber gasket, a metal pre-twisted wire, and a metal sheath are provided, with the distance between the two spline curves being the diameter of the metal pre-twisted wire. This ensures a tight fit between the metal pre-twisted wire and the metal sheath, significantly reducing contact resistance and improving current conduction performance. Simultaneously, the first limiting block of the metal sheath and the second limiting block of the rubber gasket can limit the pre-twisted wire, preventing its displacement. Furthermore, the contact area between the first and second limiting blocks and the metal pre-twisted wire is small, which can accommodate the errors present in the metal pre-twisted wire, thus facilitating installation and ensuring the stability of the electrical connection. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this utility model; Figure 2 This is a schematic diagram of the overall structure from another angle of Embodiment 1 of this utility model; Figure 3 This is a schematic diagram of the structure of the rubber gasket and metal pre-twisted wire in Embodiment 1 of this utility model; Figure 4 This is a schematic diagram of the structure of the metal sheath in Embodiment 1 of this utility model; Figure 5 This is a schematic diagram of the structure of the first base in Embodiment 1 of this utility model; Figure 6 This is a schematic diagram of the structure of the rubber gasket in Embodiment 1 of this utility model; Figure 7 This is a schematic diagram of the structure of the metal liner plate in Embodiment 1 of this utility model; Figure 8 This is a schematic diagram of the structure of the second base and the second pressure cover in Embodiment 2 of this utility model.

[0025] In the diagram: 10. Rubber pad; 11. Second limiting block; 12. Metal liner; 13. Protrusion; 14. Through hole; 20. Metal pre-twisted wire; 30. Metal sheath; 31. First limiting block; 32. First base; 321. First connecting hole; 33. First pressure cap; 34. Fixing post; 341. Fixing shaft; 35. Rotating ring; 36. Lower ear plate; 37. Upper ear plate; 38. Support tube; 40. Second base; 41. Second pressure cap. Detailed Implementation

[0026] The technical solutions in 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. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. Example

[0027] like Figure 1-7 As shown in the embodiment of this application, a current-conducting pre-twisted wire clamp is disclosed, including a rubber pad 10, a metal pre-twisted wire 20, and a metal sheath 30. There are two rubber pads 10, which are installed on the external conductor. After the metal pre-twisted wire 20 is wrapped around the rubber pad 10, it is placed in the metal sheath 30. The longitudinal section spline curve of the inner surface of the metal sheath 30 is consistent with the longitudinal section spline curve of the outer surface of the rubber pad 10. The distance between the two spline curves is the diameter of the metal pre-twisted wire 20, which ensures a tight fit between the metal pre-twisted wire 20 and the metal sheath 30, greatly reducing the contact resistance and improving the current-conducting performance. A first limiting block 31 is provided at both ends of the metal sheath 30, and a second limiting block 11 is provided at both ends of the rubber pad 10. The number of the first limiting block 31 and the second limiting block 11 is the same as the number of metal pre-twisted wires 20. The first limiting block 31 of the metal sheath 30 and the second limiting block 11 of the rubber pad 10 can limit the pre-twisted wire and prevent it from shifting. Furthermore, the contact area between the first limiting block 31, the second limiting block 11 and the metal pre-twisted wire 20 is small, which can accommodate the errors present in the metal pre-twisted wire 20, thus facilitating installation and ensuring the stability of the electrical connection.

[0028] Specifically, the length of the metal sheath 30 is less than the length of the rubber pad 10, and the distance from the first limiting block 31 to the middle of the metal sheath 30 is less than the distance from the second limiting block 11 to the middle of the rubber pad 10. This avoids excessive compression between the metal sheath 30, the metal pre-twisted wire 20, and the ends of the rubber pad 10, reducing stress concentration during installation. At the same time, it provides a certain deformation space for the rubber pad 10, ensuring stable fit of each component under different working conditions, such as thermal expansion and contraction caused by temperature changes, thus extending the service life of this flow-guiding pre-twisted clamp.

[0029] During setup, the first limiting block 31 has a triangular cross-section, with the height from the base to the top of the triangle being less than the diameter of the spiral metal pre-twisted wire 20. This triangular structure guides the rapid positioning and installation of the metal pre-twisted wire 20 while preventing excessive friction or compression between the limiting block and the wire due to excessive height, ensuring the structural integrity of the pre-twisted wire. Simultaneously, it does not affect the fit between the pre-twisted wire and the metal sheath 30, further guaranteeing flow stability. The second limiting block 11 has a rectangular cross-section, with the height of the rectangle being less than the diameter of the spiral metal pre-twisted wire 20. The rectangular structure provides stable lateral support for the metal pre-twisted wire 20, preventing it from shifting left or right during winding and ensuring uniform arrangement of the pre-twisted wire. The height design avoids interference with the fit between the pre-twisted wire and the metal sheath 30, allowing the pre-twisted wire to naturally conform to the surface of the rubber pad 10, ensuring a smooth flow path.

[0030] In a specific configuration, an arc-shaped metal backing plate 12 is provided inside the rubber pad 10. A protrusion 13 is provided on the metal backing plate 12 corresponding to the second limiting block 11, and a through hole 14 is provided on the protrusion 13. The arc-shaped metal backing plate 12 inside the rubber pad 10 enhances the overall structural strength and prevents the rubber pad 10 from deforming due to long-term stress. The metal backing plate 12 and the rubber are bonded together as a whole through a vulcanization reaction to form the rubber pad 10. The protrusion 13 with the through hole 14 on the metal backing plate 12, corresponding to the second limiting block 11, is tightly bonded to the rubber through a vulcanization reaction. This not only improves the connection strength between the rubber and the backing plate, preventing separation, but also strengthens the limiting effect through the cooperation of the protrusion 13 and the second limiting block 11, further ensuring the structural stability of the rubber pad 10 and the current-carrying reliability of the clamp. Conductive rubber can be used to further improve the electrical connection capability of this current-carrying pre-twisted clamp.

[0031] The metal sheath 30 includes a first base 32 and a first pressure cap 33. The first base 32 is provided with two concentrically arranged fixing posts 34. The two fixing posts 34 are both concentrically provided with fixing shafts 341 on opposite sides. A rotating ring 35 is rotatably sleeved on the fixing shaft 341. The first pressure cap 33 is connected to the two rotating rings 35. The first base 32 and the first pressure cap 33 are rotatably connected through the fixing posts 34, fixing shafts 341 and rotating rings 35, so that the first pressure cap 33 can be flexibly opened and closed around the first base 32, simplifying the installation operation. A lower ear plate 36 is provided on the side of the first base 32 away from the fixed post 34, and an upper ear plate 37 is provided on the side of the first pressure cover 33 away from the rotating ring 35. Both the lower ear plate 36 and the upper ear plate 37 have first circular holes. The lower ear plate 36 and the upper ear plate 37 are locked together by bolts. The bolts allow for quick and easy fixing of the lower ear plate 36 and the upper ear plate 37, ensuring stable clamping force of the metal sheath 30 on the internal components and improving the installation and maintenance efficiency of the wire clamp. A first connecting hole 321 is provided on the side of the first base 32 away from the lower ear plate 36, and a bolt is installed in the first connecting hole 321. Support tubes 38 are respectively provided on the bottom surface of the first base 32 corresponding to the first connecting hole 321 and on the bottom surface of the lower ear plate 36 corresponding to the first circular hole. The support tube 38 is used to support the first base 32. The bolt assembly includes a bolt and a nut. One bolt passes through the first connecting hole 321, the support tube 38, and the fixing hole of the mounting base before being connected to the nut. The other bolt passes through the first circular hole, the support tube 38, and the fixing hole of the mounting base before being connected to the nut. The mounting base provides an installation position for the flow-guiding pre-twisted clamp.

[0032] The working principle of a flow-guiding pre-twisted wire clamp in this embodiment is as follows: During installation, two rubber pads 10 are installed on the external conductor. Then, metal pre-twisted wire 20 is wound around the rubber pads 10. The second limiting block 11 is used to ensure that the wires are evenly arranged. Then, the rubber pads 10 with the pre-twisted wire are placed into the first base 32 of the metal sheath 30, so that the spline curve of the metal sheath 30 and the rubber pads 10 are matched and the first limiting block 31 and the second limiting block 11 limit the pre-twisted wire. Then, the first pressure cover 33 is closed by rotating the ring 35. One bolt passes through the first connecting hole 321, the support tube 38, and the fixing hole of the mounting base and is connected to the nut. Another bolt passes through the first round hole, the support tube 38, and the fixing hole of the mounting base and is connected to the nut, thus completing the installation. Example

[0033] like Figure 8 As shown, the difference between this embodiment and Embodiment 1 lies only in the structure of the metal sheath 30. The metal sheath 30 includes a second base 40 and a second pressure cap 41. The second base 40 and the second pressure cap 41 are fixed on both sides by two bolts. The second base 40 has two second mounting holes spaced apart, and the second pressure cap 41 has two second round holes spaced apart. The bolts include bolts and nuts. The bolts pass through the second round holes and the second mounting holes and are screwed into the nuts to fix the second base 40 and the second pressure cap 41, which is suitable for support installation.

[0034] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A current-guiding pre-twisted wire clamp, comprising a rubber pad (10), metal pre-twisted wire (20), and a metal sheath (30), characterized in that: Two rubber pads (10) are installed on the external conductor. After the rubber pads (10) are wrapped with metal pre-twisted wires (20), they are placed in the metal sheath (30). The longitudinal section spline curve of the inner surface of the metal sheath (30) is consistent with the longitudinal section spline curve of the outer surface of the rubber pads (10). The distance between the two spline curves is the diameter of the metal pre-twisted wires (20). The metal sheath (30) is provided with a first limiting block (31) at both ends, and the rubber pads (10) are provided with a second limiting block (11) at both ends. The number of the first limiting block (31) and the second limiting block (11) is the same as the number of metal pre-twisted wires (20).

2. The current-guiding pre-twisted clamp according to claim 1, characterized in that: The length of the metal sheath (30) is less than the length of the rubber pad (10), and the distance from the first limiting block (31) to the middle of the metal sheath (30) is less than the distance from the second limiting block (11) to the middle of the rubber pad (10).

3. The current-guiding pre-twisted clamp according to claim 1, characterized in that: The first limiting block (31) has a triangular cross section, and the height from the bottom to the top of the triangle is less than the diameter of the spiral metal pre-twisted wire (20).

4. A current-guiding pre-twisted clamp according to claim 1, characterized in that: The second limiting block (11) has a rectangular cross-section, and the height of the rectangle is less than the diameter of the spiral metal pre-twisted wire (20).

5. A current-guiding pre-twisted clamp according to claim 1, characterized in that: The rubber pad (10) is provided with an arc-shaped metal liner (12), and the metal liner (12) is provided with a protrusion (13) corresponding to the second limiting block (11), and the protrusion (13) is provided with a through hole (14).

6. A current-guiding pre-twisted clamp according to claim 1, characterized in that: The metal sheath (30) includes a first base (32) and a first pressure cap (33). The first base (32) is provided with two concentrically arranged fixing posts (34). The fixing posts (34) are provided with a fixed shaft (341) concentrically arranged. A rotating ring (35) is rotatably sleeved on the fixing shaft (341). The first pressure cap (33) is connected to the two rotating rings (35). A lower ear plate (36) is provided on the side of the first base (32) away from the fixing posts (34). An upper ear plate (37) is provided on the side of the first pressure cap (33) away from the rotating rings (35). A first round hole is provided on both the lower ear plate (36) and the upper ear plate (37). The lower ear plate (36) and the upper ear plate (37) are locked by bolts.

7. A current-guiding pre-twisted clamp according to claim 6, characterized in that: A first connecting hole (321) is provided on the side of the first base (32) away from the lower ear plate (36). A bolt is provided in the first connecting hole (321). A support tube (38) is provided on the bottom surface of the first base (32) corresponding to the position of the first connecting hole (321) and on the bottom surface of the lower ear plate (36) corresponding to the position of the first round hole.

8. A current-guiding pre-twisted clamp according to claim 1, characterized in that: The metal sheath (30) includes a second base (40) and a second pressure cap (41), and the second base (40) and the second pressure cap (41) are fixed on both sides by two bolts respectively.

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