Cable accessory stress cone with adjusting function

Abstract

The invention belongs to the technical field of cable accessories, and discloses a cable accessory stress cone with an adjusting function, which comprises a stress cone end part and a stress cone opening part, the stress cone end part and the stress cone opening part are integrally formed, and the stress cone end part is of a hollow cylindrical structure. The opening part of the stress cone is tightened or relaxed through the limiting ring arranged at the outer end of the opening part of the stress cone in a sleeving mode, in the position adjusting process of the limiting ring, the elastic piece is extruded by the limiting ring, and the radian of the whole elastic piece is changed along with change of the position of the limiting ring; the whole inner wall surface of the opening part of the stress cone is pushed to be tightened inwards instead of the position where the limiting ring is located to be tightened inwards, so that the whole inner wall surface of the opening part of the stress cone can be attached to the surface of the cable, and the situation that the bearing capacity of the cable is reduced due to the fact that the stress of the non-attached part is too large is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of cable accessories, and in particular to a cable accessory stress cone with an adjustment function. Background Art

[0002] Prefabricated rubber stress cone is a key component for cables and their accessories to homogenize the electric field of cable accessories during high-voltage power transmission. When the cable insulation shield is cut off, it can properly improve the electric field at the disconnection point of the semi-conductive shield (or sheath) and the connection point of the core, so that the field strength trend at the cut-off point of the power cable insulation shield is evenly distributed, thereby greatly reducing the electric field concentration near the shielding layer and preventing the cable accessories from being broken down. Therefore, whether its performance can meet the requirements is crucial, which is related to the actual use effect of the cable accessories.

[0003] A Chinese invention patent (publication number CN206962409U) was searched and disclosed a stress cone of nonlinear conductive material. By applying force to the center of the opening of the stress cone through a circular ring, the curvature of the opening can be changed, thereby adapting to cables of different sizes.

[0004] However, it is found through practical application that this technical solution still has at least the following defects:

[0005] In this scheme, the circular ring used to tighten the open end of the stress cone is set at the end of the open end. During the process of tightening the circular ring, only the end of the open end can be obviously deformed, while the deformation degree of the rest of the open end is small, and it is impossible to ensure close fit with the cable, which causes stress concentration in a local area, increases the stress in this area, and thus reduces the carrying capacity of the cable system. Summary of the invention

[0006] The present invention intends to provide a cable accessory stress cone with an adjustment function to solve the problems raised in the above-mentioned background technology. In this scheme, a plurality of elastic sheets are embedded inside the stress cone opening, and the stress cone opening is tightened or loosened by a limiting ring sleeved on the outer end of the stress cone opening. In the process of adjusting the position of the limiting ring, the elastic sheet is squeezed by the limiting ring, and the curvature of the elastic sheet as a whole changes with the change of the position of the limiting ring, thereby pushing the entire inner wall surface of the stress cone opening to tighten inward, rather than just tightening inward at the position where the limiting ring is located, thereby ensuring that the entire inner wall surface of the stress cone opening can be fitted with the cable surface, avoiding excessive stress in the unfitted parts and reducing the bearing capacity of the cable. At the same time, through the deformation groove opened inside the stress cone opening, it can be ensured that the various surfaces of the inner wall of the stress cone opening synchronously shrink toward the center position during the tightening process to avoid irregular deformation.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] A cable accessory stress cone with an adjustment function comprises a stress cone end and a stress cone opening, wherein the stress cone end and the stress cone opening are integrally formed, the stress cone end is arranged as a hollow cylindrical structure, the outer end and the inner wall diameter of the stress cone opening gradually increase from the stress cone end toward the stress cone opening, a plurality of elastic sheets are embedded and installed at the inner end of the stress cone end, the plurality of elastic sheets are equidistantly arranged in a ring shape with the stress cone opening as the axis, and a limiting ring is provided at the outer end of the stress cone opening.

[0009] Preferably, the elastic sheet is configured as an arc-shaped structure matching the curvature of the opening of the stress cone.

[0010] Preferably, a plurality of slots are provided at the outer end of the stress cone opening, and the plurality of slots are all configured as an annular structure matching the width of the limiting ring.

[0011] Preferably, the plurality of grooves are arranged equidistantly along the surface of the stress cone opening, and the diameters of the plurality of grooves gradually increase from the end of the stress cone toward the stress cone opening.

[0012] Preferably, both ends of the limiting ring are integrally formed with a plurality of annular teeth, and the plurality of annular teeth are arranged in concentric circles with the limiting ring as the axis.

[0013] Preferably, a plurality of deformation grooves are formed on the inner wall of the stress cone opening, and the plurality of deformation grooves are arranged equidistantly in a ring shape with the stress cone opening as the axis.

[0014] Compared with the prior art, this technical solution produces the following beneficial effects:

[0015] In this scheme, a plurality of elastic sheets are embedded inside the stress cone opening, and the stress cone opening is tightened or loosened by a limiting ring sleeved on the outer end of the stress cone opening. During the process of adjusting the position of the limiting ring, the elastic sheet is squeezed by the limiting ring, and the curvature of the elastic sheet as a whole changes with the change of the position of the limiting ring, thereby pushing the entire inner wall surface of the stress cone opening to tighten inward, rather than just tightening inward at the position where the limiting ring is located, thereby ensuring that the entire inner wall surface of the stress cone opening can be fitted with the cable surface, avoiding excessive stress in the unfitted parts, thereby reducing the carrying capacity of the cable. At the same time, through the deformation groove opened inside the stress cone opening, it can be ensured that the various surfaces of the inner wall of the stress cone opening shrink toward the center position synchronously during the tightening process, avoiding irregular deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the front cross-sectional structure of the stress cone end portion and the stress cone opening portion provided by the present invention;

[0017] Figure 2A schematic diagram of the front cross-sectional structure of the limit ring provided by the present invention;

[0018] Figure 3 The present invention provides Figure 2 Schematic diagram of the structure at A in the middle;

[0019] Figure 4 This is a schematic diagram of the side sectional structure of the stress cone opening provided by the present invention.

[0020] Figure numerals: 1, stress cone end; 2, stress cone opening; 3, elastic sheet; 4, limiting ring; 5, clamping groove; 6, deformation groove; 7, annular clamping tooth. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments:

[0022] like Figure 1-2 A cable accessory stress cone with an adjustment function is shown, comprising a stress cone end 1 and a stress cone opening 2, the stress cone end 1 and the stress cone opening 2 are integrally formed, the stress cone end 1 is arranged as a hollow cylindrical structure, the outer end and the inner wall diameter of the stress cone opening 2 gradually increase from the stress cone end 1 to the stress cone opening 2, a plurality of elastic sheets 3 are embedded and installed at the inner end of the stress cone end 1, the plurality of elastic sheets 3 are arranged equidistantly in a ring shape with the stress cone opening 2 as the axis, a limiting ring 4 is sleeved on the outer end of the stress cone opening 2, the elastic sheet 3 is arranged as an arc structure matching the curvature of the stress cone opening 2, a plurality of slots 5 are provided at the outer end of the stress cone opening 2, the plurality of slots 5 are all arranged as an annular structure matching the width of the limiting ring 4, the plurality of slots 5 are arranged equidistantly along the surface of the stress cone opening 2, and the diameters of the plurality of slots 5 gradually increase from the stress cone end 1 to the stress cone opening 2.

[0023] Prefabricated rubber stress cone is a key component for cables and their accessories to homogenize the electric field of cable accessories during high-voltage power transmission. When the cable insulation shield is cut off, it can properly improve the electric field at the semi-conductive shield or sheath disconnection and the core connection, so that the field strength trend at the cut-off point of the power cable insulation shield is evenly distributed, thereby greatly reducing the electric field concentration near the shielding layer and preventing the cable accessories from being broken down. Therefore, whether its performance can meet the requirements is crucial, which is related to the actual use effect of the cable accessories.

[0024] When installing the stress cone, it should be ensured that it fits closely with the cable to avoid stress concentration in a local area. In this solution, the user can tighten or loosen the opening of the stress cone opening 2 by changing the position of the limit ring 4. Since the size of the limit ring 4 remains unchanged, the user sets the limit ring 4 into different card slots 5 to apply different degrees of tightening force to the stress cone opening 2. The closer the limit ring 4 is to the open end of the stress cone opening 2, the tighter the stress cone opening 2 is, and thus it can be adapted to cables with smaller sizes. The limit ring 4 applies tightening force to the stress cone opening 2. When the tightening force is applied, the elastic sheet 3 will be squeezed, and the curvature of the elastic sheet 3 as a whole will change, thereby forcing the entire inner wall surface of the stress cone opening 2 to tighten inward, rather than just the position where the limiting ring 4 is located. This ensures that the entire inner wall surface of the stress cone opening 2 can fit the cable surface, avoiding excessive stress in the unfitted parts, which would reduce the carrying capacity of the cable. The elastic sheet 3 is set to be a memory material, which can change its own curvature as the position of the limiting ring 4 changes, thereby ensuring that the diameter of the inner cavity of the stress cone opening 2 changes as the position of the limiting ring 4 changes.

[0025] like Figure 3 As shown, a plurality of annular teeth 7 are integrally formed at both ends of the limiting ring 4, and the plurality of annular teeth 7 are arranged in a concentric circle with the limiting ring 4 as the axis.

[0026] In this solution, when the limiting ring 4 is engaged with the inside of the slot 5, the provision of multiple annular teeth 7 can effectively enhance the friction between the limiting ring 4 and the inner wall of the slot 5, thereby improving the stability of the limiting ring 4 and reducing the possibility of it falling off.

[0027] like Figure 4 As shown, the inner wall of the stress cone opening 2 is provided with a plurality of deformation grooves 6, and the plurality of deformation grooves 6 are arranged in a ring shape and at equal intervals with the stress cone opening 2 as the axis.

[0028] In the present embodiment, the provision of multiple deformation grooves 6 can provide redundancy for the deformation of the inner wall of the stress cone opening 2. When the inner wall of the stress cone opening 2 is tightened, the inner walls of the multiple deformation grooves 6 can shrink inward synchronously, thereby ensuring that the various surfaces of the inner wall of the stress cone opening 2 shrink toward the center position synchronously to prevent irregular deformation.

[0029] The specific implementation process is as follows:

[0030] When in use, the user puts the limiting ring 4 into different slots 5, and can apply different degrees of tightening force to the stress cone opening 2. The closer the limiting ring 4 is to the open end of the stress cone opening 2, the tighter the stress cone opening 2 is, and thus it can be adapted to cables with smaller sizes. When the limiting ring 4 applies tightening force to the stress cone opening 2, it squeezes the elastic sheet 3, and the overall curvature of the elastic sheet 3 changes, thereby forcing the entire inner wall surface of the stress cone opening 2 to tighten inward, rather than just the position where the limiting ring 4 is located, thereby ensuring that the entire inner wall surface of the stress cone opening 2 can fit the cable surface.

[0031] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A cable accessory stress cone with adjustment function, characterized in that: The invention comprises a stress cone end portion (1) and a stress cone opening portion (2), wherein the stress cone end portion (1) and the stress cone opening portion (2) are integrally formed, the stress cone end portion (1) is arranged as a hollow cylindrical structure, the outer end and the inner wall diameter of the stress cone opening portion (2) gradually increase from the stress cone end portion (1) to the stress cone opening portion (2), a plurality of elastic sheets (3) are embedded and installed at the inner end of the stress cone end portion (1), the plurality of elastic sheets (3) are arranged in a ring-shaped manner with equal distances around the stress cone opening portion (2), and a limiting ring (4) is sleeved on the outer end of the stress cone opening portion (2).

2. A cable accessory stress cone with an adjustment function as claimed in claim 1, characterized in that: The elastic sheet (3) is configured as an arc-shaped structure that matches the arc of the stress cone opening (2).

3. A cable accessory stress cone with an adjustment function as claimed in claim 1, characterized in that: The outer end of the stress cone opening (2) is provided with a plurality of slots (5), and the plurality of slots (5) are all arranged as an annular structure matching the width of the limiting ring (4).

4. A cable accessory stress cone with an adjustment function as claimed in claim 3, characterized in that: The plurality of clamping grooves (5) are arranged at equal distances along the surface of the stress cone opening (2), and the diameters of the plurality of clamping grooves (5) gradually increase from the stress cone end (1) toward the stress cone opening (2).

5. The cable accessory stress cone with adjustment function as claimed in claim 1, characterized in that: Both ends of the limiting ring (4) are integrally formed with a plurality of annular latch teeth (7), and the plurality of annular latch teeth (7) are arranged in a concentric circle with the limiting ring (4) as the axis.

6. A cable accessory stress cone with an adjustment function as claimed in claim 1, characterized in that: The inner wall of the stress cone opening (2) is provided with a plurality of deformation grooves (6), and the plurality of deformation grooves (6) are arranged in a ring-shaped manner and at equal distances with the stress cone opening (2) as the axis.

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