Stress cone and sealing structure applied to high-voltage cable terminal

Abstract

The utility model discloses a stress cone and sealing structure applied to a high voltage cable terminal, comprising a stress cone body and a sealing flange, the stress cone body comprises an upper cone and a lower sealing cylinder, the center of the upper cone is provided with a cable through hole, the inner wall of the cable through hole is lined with an expansion rubber cylinder, and the inner wall of the expansion rubber cylinder is provided with a sealing flange. The lower sealing cylinder is tightly sleeved on a flange cylinder of the sealing flange; at least two circles of annular sealing grooves are further formed in the outer wall of a flange cylinder of the sealing flange, and a lower sealing cylinder is tightly arranged on the flange cylinder of the sealing flange in a sleeving mode and located at the positions of the annular sealing grooves to be locked and sealed through locking hoops. According to the stress cone and the sealing structure, the overall design and construction are novel, the possibility of leakage of insulating oil in a terminal sleeve is almost completely isolated through higher sealing design of related parts of the stress cone and the sealing structure, the sealing performance is greatly improved, and the use safety of the whole stress cone is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of power transmission line terminal equipment technology, and in particular to a stress cone and sealing structure for use in high-voltage cable terminals. Background Technology

[0002] Currently, in the use of large high-voltage power transmission cables, many places require the use of large cable connection terminals. These large terminals often use external bushings and internal insulation oil filling. However, due to structural design defects, the connection and sealing problem between the stress cone inside the porcelain bushing and the base flange has not been well resolved. As the service time increases, the insulation oil in the bushing cavity will slowly seep downwards from the connection point, causing the insulation oil level in the cavity to gradually decrease until it fails to meet the usage requirements. In this case, the entire terminal will be scrapped, affecting its actual service life. Utility Model Content

[0003] The purpose of this invention is to address the above-mentioned issues by providing a stress cone and sealing structure for use in high-voltage cable terminals. This structure, when applied to high-voltage transmission terminals, provides better sealing performance and higher safety.

[0004] The specific solution of this utility model is: a stress cone and sealing structure applied to a high-voltage cable terminal, including a stress cone body and a sealing flange. The stress cone body includes an upper cone and a lower sealing cylinder. A cable through hole is provided at the center of the upper cone. An expansion rubber cylinder is lined on the inner wall of the cable through hole. The lower sealing cylinder is tightly fitted onto the flange cylinder of the sealing flange. At least two annular sealing grooves are also provided on the outer wall of the flange cylinder of the sealing flange. The lower sealing cylinder is tightly fitted onto the flange cylinder of the sealing flange and is locked and sealed at the position of the annular sealing groove by a locking clamp.

[0005] Furthermore, the upper end of the expansion rubber cylinder in this invention is provided with a rounded corner, and the outer ring of the upper end of the upper cone is provided with a rounded corner.

[0006] Furthermore, both the upper cone and the lower sealing cylinder described in this utility model are made of silicone rubber.

[0007] Furthermore, the locking clamp described in this utility model adopts a hose clamp structure, with the hose clamp lock heads staggered by 180°.

[0008] Furthermore, the outer wall shape of the upper cone in this invention, from top to bottom, is an upright cone surface, a cylindrical surface, and an inverted cone surface.

[0009] The stress cone and sealing structure in this utility model have a novel overall design and construction. By implementing a more advanced sealing design for its relevant parts, the possibility of leakage of insulating oil in the terminal bushing is almost completely isolated, and the sealing performance is greatly improved, which greatly enhances the safety of the entire stress cone in use. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure from the main view direction of this utility model;

[0011] Figure 2 This is a schematic diagram of the structure of this utility model from the main view after the locking clamp is removed;

[0012] Figure 3 This is a schematic diagram of the stress cone body structure in the main view direction of this utility model;

[0013] Figure 4 yes Figure 3 A schematic diagram of the structure viewed from below.

[0014] In the diagram: 1—Upper cone, 2—Lower sealing cylinder, 3—Sealing flange, 4—Locking clamp, 5—Annular sealing groove, 6—Rounded corner, 7—Cable perforation, 8—Upright cone surface, 9—Cylindrical surface, 10—Inverted cone surface, 11—Expansion rubber cylinder. Detailed Implementation

[0015] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model. In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," etc., indicating orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model or simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0016] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0017] See Figures 1-4 This utility model relates to a stress cone and sealing structure for high-voltage cable terminals, comprising a stress cone body and a sealing flange 3. The stress cone body includes an upper cone 1 and a lower sealing cylinder 2. A cable perforation 7 is provided at the center of the upper cone, and an expansion rubber cylinder 11 is lined on the inner wall of the cable perforation. The lower sealing cylinder is tightly fitted onto the flange cylinder of the sealing flange. At least two annular sealing grooves 5 are also formed on the outer wall of the flange cylinder of the sealing flange. The lower sealing cylinder is tightly fitted onto the flange cylinder of the sealing flange and is locked and sealed at the position of the annular sealing groove by a locking clamp 4. Furthermore, the locking clamp in this utility model adopts a hose clamp structure, with the hose clamp locking heads staggered by 180°. Furthermore, the upper end of the expansion rubber cylinder is provided with a rounded corner 6, and the upper outer ring of the upper cone is also provided with a rounded corner. Furthermore, both the upper cone and the lower sealing cylinder in this utility model are made of silicone rubber. Furthermore, the outer wall shape of the upper cone in this utility model, from top to bottom, is an upright cone surface 8, a cylindrical surface 9, and an inverted cone surface 10.

[0018] This utility model is a combination of a stress cone and related sealing structure. The cable passes through the center of the cable hole. Due to the inner lining of the expansion rubber cylinder, the cable is clamped very tightly after passing through, resulting in excellent sealing performance. Then, at the lower connecting flange, i.e. the sealing flange, the lower sealing cylinder is tightly fitted onto the flange cylinder of the sealing flange. Combined with the upper annular sealing groove and the locking of multiple layers of locking clamps, the insulating oil can hardly seep into the flange from this connection point. In this way, the insulating oil level in the terminal bushing will not drop, thus ensuring the long-term and safe use of the terminal.

[0019] The stress cone and sealing structure in this utility model have a novel overall design and construction. By implementing a more advanced sealing design for its relevant parts, the possibility of leakage of insulating oil in the terminal bushing is almost completely isolated, and the sealing performance is greatly improved, which greatly enhances the safety of the entire stress cone in use.

Claims

1. A stress cone and seal structure for application to a high voltage cable termination, characterized by: The stress cone body comprises an upper cone and a lower sealing cylinder, the cable through hole is provided at the center of the upper cone, the inner wall of the cable through hole is lined with an expansion rubber cylinder, and the lower sealing cylinder is tightly sleeved on the flange cylinder of the sealing flange; at least two annular sealing grooves are formed on the outer wall of the flange cylinder of the sealing flange, and the lower sealing cylinder is tightly sleeved on the flange cylinder of the sealing flange and located at the position of the annular sealing grooves and locked by a locking clamp.

2. A stress cone and seal structure for use in a high voltage cable termination according to claim 1, characterized in that: The upper end of the expansion rubber cylinder is provided with a rounded corner, and the outer circle of the upper end of the upper cone is provided with a rounded corner.

3. A stress cone and seal structure for use in a high voltage cable termination according to claim 1, characterized in that: The upper cone and the lower sealing cylinder are both made of silicone rubber material.

4. A stress cone and seal structure for use in a high voltage cable termination according to claim 1, characterized in that: The locking clamp adopts a throat clamp structure, and the locking heads of the throat clamp are arranged at an interval of 180°.

5. A stress cone and seal structure for use in a high voltage cable termination according to claim 1, characterized in that: The shape of the outer wall of the upper cone is a normal cone surface, a cylindrical surface and an inverted cone surface from top to bottom.

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