Box cover for high-voltage switchgear

Abstract

The utility model relates to the technical field of high-voltage switch equipment, in particular to a box cover for high-voltage switch equipment. Comprising a die-casting cover body, the die-casting cover body comprises a main cover plate and a surrounding wall surrounding the edge of the main cover plate, the opening edge of the surrounding wall is provided with a sealing connection structure used for being in sealing connection with an equipment box body, and an operation shaft mounting hole is formed in the main cover plate; the die-casting cover body in the box cover is formed at a time through die casting, the sealing connection structure and the operation shaft installation hole are integrated, quality control is relatively direct, consistency and stability are high, and the sealing connection structure can ensure that the joint between the box cover and the box body achieves an excellent sealing effect; accurate pressure casting of the operation shaft mounting hole ensures accuracy and stability of the high-voltage switchgear in the operation process, reliability and stability of the high-voltage switchgear are improved, the pressure casting cover body has higher structural strength and rigidity, and the service life of the high-voltage switchgear can be effectively prolonged when the pressure casting cover body is used for the high-voltage switchgear.

Description

Technical Field

[0001] The utility model relates to the technical field of high-voltage switchgear, in particular to a box cover for high-voltage switchgear. Background Art

[0002] In recent years, the high-voltage switchgear industry has continuously increased its research and development of maintenance-free switchgear. An important part of this is reflected in the reliability of product sealing, which reflects the ability of circuit breakers to maintain safety and stability. As an important component of high-voltage switchgear, the box cover is usually used to enclose and protect the main components of high-voltage switchgear such as circuit breakers, disconnectors, and grounding switches. It provides a sealed environment for the main components in the high-voltage switchgear box, preventing the external environment from invading the internal electrical equipment, thereby ensuring the safe and stable operation of the equipment.

[0003] Currently, the most common high-voltage switchgear is a welded box cover formed by cutting, bending and welding the plate. Although the sealing of the high-voltage switchgear can be ensured during use, the welded box cover will inevitably produce cracks, slag inclusions and other phenomena during processing and manufacturing, which will affect the performance of the welded box cover and further affect the performance and service life of the high-voltage switchgear during use. Utility Model Content

[0004] The purpose of the utility model is to provide a box cover for high-voltage switchgear, so as to solve the problem in the prior art that the welded box cover has unstable performance during use due to welding defects, thereby affecting the normal use of the high-voltage switchgear.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the box cover for high-voltage switchgear provided by the present invention is: it includes a die-cast cover body, the die-cast cover body includes a main cover plate and a surrounding wall surrounding the edge of the main cover plate, the edge of the surrounding wall has a sealing connection structure for sealing connection with the equipment box body, and the main cover plate is provided with an operating shaft mounting hole.

[0006] As a further improvement, the outline of the main cover plate includes four large-diameter arc segments and a small-diameter arc segment connecting the two adjacent large-diameter arc segments. The surrounding wall includes four straight line segments corresponding one-to-one to the large-diameter arc segments and rounded corner segments corresponding one-to-one to the small-diameter arc segments. In the projection perpendicular to the main cover plate, the main cover plate is located on the inner side of the surrounding wall, and the root of the surrounding wall connected to the main cover plate has an inward transition section.

[0007] As a further improvement, the sealing connection structure includes a sealing ring installation groove provided on the end surface of the surrounding wall and a cover body connection hole located outside the sealing ring installation groove, and a sealing ring is installed in the sealing ring installation groove.

[0008] As a further improvement, the cover connecting holes are arranged at both ends of the rounded section.

[0009] As a further improvement, an inner flange is formed on the inner side of the end of the surrounding wall facing away from the main cover plate, and the sealing ring installation groove is provided on the inner flange.

[0010] As a further improvement, a wiring harness fixing structure is die-casted on the inner side of the main cover.

[0011] As a further improvement, a connector mounting hole is provided on the surrounding wall.

[0012] As a further improvement, the inner side surface of the main cover plate is die-cast with reinforcing ribs, and the reinforcing ribs are symmetrically arranged with the center of the main cover plate as the center.

[0013] The beneficial effects are as follows: the utility model provides a box cover for high-voltage switchgear that is improved from the existing welded box cover. The die-cast cover body in the box cover is die-cast in one step, and the operating shaft mounting hole and the sealing connection structure are integrated. The quality control is relatively direct, and its consistency and stability are high. First, the sealing connection structure can ensure that the joint between the box cover and the box body achieves an excellent sealing effect, protects the electrical components inside the high-voltage switchgear from environmental factors, and improves the reliability and stability of the equipment. Secondly, the precise die-casting of the operating shaft mounting hole on the die-cast cover body ensures the accuracy and stability of the high-voltage switchgear during operation, reduces the steps of subsequent processing and assembly, reduces costs and maintenance difficulties, and improves production efficiency; finally, the die-cast cover body has higher structural strength and rigidity, and its use in high-voltage switchgear can effectively extend the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a front view of an embodiment of a box cover for a high-voltage switchgear provided by the utility model;

[0015] Figure 2 A top view of an embodiment of a box cover for a high-voltage switchgear provided by the present utility model;

[0016] Figure 3 A bottom view of an embodiment of a box cover for a high-voltage switchgear provided by the present utility model;

[0017] Figure 4 for Figure 3 DD sectional view;

[0018] Figure 5 for Figure 3 BB cross-sectional view;

[0019] Figure 6 for Figure 3 AA sectional view;

[0020] In the figure: 1. Operating shaft mounting hole; 2. Rounded corner section; 3. Inner flange; 4. Sealing ring mounting groove; 5. Wire harness fixing structure; 6. Cover body connection hole; 7. Connector mounting hole; 8. Dispersed reinforcement rib structure; 9. Cross reinforcement rib structure; 10. Square reinforcement rib structure; 11. Straight line section. DETAILED DESCRIPTION

[0021] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0022] Currently, after being installed on the high-voltage equipment box, the welded box cover will inevitably have problems such as cracks, slag inclusions, and air holes during processing and manufacturing. Its quality control involves multiple links, making it difficult to reliably ensure that the quality and performance meet the requirements of high-voltage switchgear. As a result, during use, the box cover may not be able to withstand normal operating pressure, and may also allow moisture, dust, etc. to enter the equipment due to poor sealing, affecting the normal operation and safety of the equipment, not only reducing the service life of the equipment and increasing the cost of maintenance and replacement, but also seriously threatening the safe operation of the entire power system. Based on this, the utility model improves the existing box cover and provides a box cover for high-voltage switchgear to solve the problems existing in the above-mentioned prior art.

[0023] The overall design concept of the box cover for high-voltage switchgear provided by the utility model is:

[0024] A box cover for high-voltage switchgear includes an integrally formed die-cast cover body, a sealing connection structure on the die-cast cover body surrounding wall and main cover plate, and an operating shaft mounting hole. The molding precision is high, ensuring the precise dimensional fit between the box cover and the box body, and reducing adjustment work during assembly. The operating shaft mounting hole allows the operating shaft to be fixed for easy operation by personnel; and ensures a correct correspondence between the operating shaft and the internal mechanical connections or electrical components of the equipment, helping to reduce swinging or movement of the operating shaft during use, preventing the operating shaft from falling off or being damaged, and ensuring the normal operation and operation of the equipment. The sealing connection structure on the die-cast box cover can achieve a sealed connection between the cover body and the box body, preventing safety hazards caused by leakage during operation of the high-voltage switchgear, and improving the safety of the high-voltage switchgear. At the same time, the die-cast cover body has a high precision, reducing or avoiding secondary machining, and has high production efficiency. At the same time, it can reduce production costs, making it particularly suitable for the field of high-voltage switchgear.

[0025] Based on the above overall introduction to the box cover for high-voltage switchgear of the present invention, a more specific embodiment is provided below on the basis of the overall introduction:

[0026] like Figures 1-6As shown, the operating shaft mounting hole 1 on the box cover is used to fix the operating shaft to prevent it from shaking or falling off during operation. The operating shaft mounting hole 1 is set in the middle area of ​​the box cover so that the operator can operate it conveniently. Specifically, the die-cast cover body has a hole that matches the output shaft of the operating mechanism. More specifically, the die-cast cover body is provided with circular holes with the same number as the operating shaft, and the diameter of the circular hole matches the operating shaft. In this embodiment, the die-cast cover body is provided with five operating shaft mounting holes 1 for installing the operating shaft, and three small holes are provided on the side of the operating shaft mounting hole 1, so that the operating shaft can be better accommodated and fixed through the circular hole. At the same time, the three small holes are used to fix the operating shaft mounting flange, so that the operating shaft can be sealed and firmly installed on the equipment, and correctly correspond to the internal mechanical connection or electrical components. Of course, in other embodiments, for equipment with relatively simple functions, only one hole or two holes can be opened for installing the operating shaft.

[0027] The outline of the main cover plate includes four large-diameter arc segments and a small-diameter arc segment connecting the two adjacent large-diameter arc segments, such as Figure 2 As shown, the surrounding wall includes a straight section 11 and a rounded section 2. The straight section 11 of the surrounding wall corresponds one-to-one to the large-diameter arc segment, and the rounded section 2 corresponds one-to-one to the small-diameter arc segment. Compared with the conventional straight plane in the prior art, stress concentration is avoided, and the outer periphery of the main cover plate and the surrounding wall is relatively flat, avoiding possible injuries to operators caused by sharp corners, reducing the risk of injury to operators caused by the corners of the box cover, especially improving safety during personnel operations such as equipment maintenance and inspection.

[0028] At the same time, the rounded corners 2 of the surrounding wall are less likely to accumulate dust or debris, facilitating daily cleaning and maintenance of the high-voltage switchgear, thereby helping to maintain the equipment in good operating condition and extend its service life. The petal-like rounded corners 2 also enhance the aesthetics of the box cover. In other embodiments, the four corners of the box cover can also be chamfered on the basis of the box cover being square, thereby reducing the sharpness to a certain extent; or the four corners of the box cover can also be set as bevels. Of course, to further improve production efficiency, the edges of the box cover can also be right angles. The box cover can be a square box cover adapted for the high-voltage switchgear.

[0029] In order to further increase the structural strength of the box cover, in this embodiment, the main cover plate is located on the inner side of the surrounding wall in the projection perpendicular to the main cover plate, and the root of the surrounding wall connected to the main cover plate has an inward transition section, thereby increasing the overall stiffness and strength of the box cover, enabling it to better withstand external impact or pressure, and improving the durability and safety of the equipment.

[0030] In addition, the box cover is provided with a cover connection hole 6 for connecting to the equipment box body. The box cover is connected to the high-voltage switchgear box body by bolts, which is simple and reliable, and easy to disassemble and repair. In other embodiments, the box cover is mounted on the box body using a buckle, which is also convenient for installation and removal.

[0031] In order to ensure the sealed assembly between the box cover and the high-voltage switchgear, a sealing ring installation groove is provided on the box cover for installing the sealing ring when the box cover is buckled on the high-voltage switch. The box cover has an outer flange for setting the sealing ring installation groove. The sealing ring installation groove on the outside of the box cover is easy to process, and only two upper and lower molds are required for die casting.

[0032] In this embodiment, in order to save space, Figure 4 As shown, the sealing ring mounting groove 4 is located on the inside of the box cover. Compared to the sealing ring mounting groove located on the outer flange of the box cover, this does not make the box cover too large. Specifically, an inner flange 3 is formed on the inner side of the end of the surrounding wall facing away from the main cover plate. The inner flange 3 is formed with the sealing ring mounting groove 4, with the opening facing away from the main cover plate. In this case, the above-mentioned upper and lower mold bodies are not applicable. Instead, a top film, four-petal film, and bottom mold structure are used. The bottom shape is formed in one go. After the top film is removed, the four petals are removed in sequence, thus achieving the one-step molding of the die-cast cover body.

[0033] When the cover is installed on the box body, it is used in conjunction with a sealing ring located at the end of the surrounding wall facing away from the main cover plate. The sealing ring is installed in the sealing ring sealing groove 4 to achieve a snap-fit ​​seal between the cover and the cover body. The cover body connection hole 6, the sealing ring installation groove 4, and the sealing ring together form a sealed connection structure that achieves a sealed connection between the cover and the box body. The sealing ring installation groove 4 is U-shaped, which allows the seal ring to fit tightly when the cover is installed on the high-voltage switchgear box body, forming a continuous sealing line, thereby improving the reliability and durability of the seal and effectively preventing leakage.

[0034] Based on the above overall introduction to the box cover for high-voltage switchgear of the present invention, a more specific embodiment is provided below on the basis of the overall introduction:

[0035] This embodiment focuses on the detailed description of the wiring harness fixing structure.

[0036] The main cover plate of the die-cast cover body is provided with a harness fixing structure 5 for fixing the harness inside the equipment box, which effectively fixes and protects the high-voltage harness inside the equipment box to prevent it from loosening, wearing or being damaged due to vibration, impact and other factors during the operation of the equipment, thereby ensuring the normal operation of the high-voltage switchgear.

[0037] The wiring harness fixing structure 5 is a screw sleeve formed when the die-cast cover is disposable. In the present embodiment, eight screw sleeves are evenly distributed circumferentially on the die-cast cover for positioning the wiring harness. Studs are installed on the screw sleeves, and wire ties are installed on the studs to bundle the wiring harness, ensuring that the wiring harness is not easy to loosen or fall off when subjected to external forces such as vibration and impact. Further, the screw sleeves are evenly distributed circumferentially near the edge on the die-cast cover, ensuring that the wiring harness has a larger room for movement inside or outside the box cover, avoiding interference with other equipment or components. And the screw sleeves near the edge make it easier for the operator to approach and operate when installing, maintaining and replacing the wiring harness, conveniently fixing and arranging the wiring harness, avoiding the wiring harness being in a mess, and improving the overall aesthetics of the equipment.

[0038] Based on the above overall introduction to the box cover for high-voltage switchgear of the present invention, a more specific embodiment is provided below on the basis of the overall introduction:

[0039] This embodiment focuses on the detailed description of the connector mounting hole.

[0040] A connector mounting hole 7 is provided on the surrounding wall of the die-cast cover body for fixing the aviation plug. In this embodiment, two connector mounting holes 7 are arranged side by side between two rounded sections of the die-cast cover body, so that the operator can connect the two aviation plugs on one side of the equipment box. At this time, the connector mounting hole 7 is arranged between two adjacent rounded sections 2, which can reduce space occupation and make the connector mounting holes 7 more compact. In addition, the rounded section 2 can also provide a certain degree of protection. During transportation, handling or use, the rounded section 2 can serve as a buffer area to reduce direct impact and scratches on the connector mounting hole 7. At the same time, the space between adjacent rounded sections 2 is used to arrange the aviation plug, which makes it easy for the operator to quickly and accurately determine the position of the connector mounting hole 7, facilitate the connection of the aviation plug, and improve work efficiency.

[0041] Based on the above overall introduction to the box cover for high-voltage switchgear of the present invention, a more specific embodiment is provided below on the basis of the overall introduction:

[0042] This embodiment focuses on the detailed description of the reinforcing ribs.

[0043] The main cover plate's inner surface is die-cast with reinforcing ribs, symmetrically arranged around the center of the die-cast cover. This ensures a highly balanced and symmetrical structure, evenly supporting and resisting forces from all directions. This reduces the risk of deformation or damage caused by uneven forces. Furthermore, the symmetrical arrangement of the ribs simplifies the design and manufacturing process, reducing production costs and improving efficiency.

[0044] Specifically, a cross-shaped reinforcement rib structure 9 is provided on the main cover plate, which divides the main cover plate into four parts. In addition, a closed square reinforcement rib structure 10 and a dispersed reinforcement rib structure 8 extending from the four corner edges of the square reinforcement rib structure 10 toward the edge of the main cover plate are provided at the middle position of the main cover plate, which together constitute the reinforcement structure on the main cover plate. The closed square reinforcement rib structure 10 forms a closed reinforcement frame, which effectively enhances the overall rigidity and deformation resistance of the box cover. At the same time, the cross-shaped reinforcement rib structure 9 and the dispersed reinforcement rib structure 8 both extend to the edge of the main cover plate, further improving the strength and stability of the box cover edge, complementing each other with the square reinforcement rib structure 10, and jointly enhancing the structural strength of the box cover, thereby improving the durability and safety of the box cover.

[0045] During manufacturing, the die-cast cover for a high-voltage switchgear housing of this utility model simultaneously die-casts the cover connection holes 6, the wiring harness fixing structure 5, the operating shaft mounting hole 1, the connector mounting hole 7, and the reinforcing ribs, ensuring that each structure is accurately positioned, fully functional, and does not interfere with each other. Furthermore, after installation in the equipment housing, the housing exhibits significant advantages in structural strength, sealing, precision consistency, production efficiency, cost, appearance quality, maintainability, and service life, reliably ensuring the safe use of the high-voltage switchgear.

[0046] It should be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0047] In addition, the various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be based on the claims. Any equivalent structural changes made using the description and drawings of the present invention shall also be included in the scope of protection of the present invention.

Claims

1. A box cover for high-voltage switchgear, characterized in that: The die-cast cover body includes a main cover plate and a surrounding wall around the edge of the main cover plate. The edge of the surrounding wall has a sealing connection structure for sealing connection with the equipment box body. The main cover plate is provided with an operating shaft mounting hole.

2. The box cover for high-voltage switchgear according to claim 1, characterized in that: The outline of the main cover plate includes four large-diameter arc segments and a small-diameter arc segment connecting the two adjacent large-diameter arc segments. The surrounding wall includes four straight line segments corresponding one-to-one to the large-diameter arc segments and rounded corner segments corresponding one-to-one to the small-diameter arc segments. In the projection perpendicular to the main cover plate, the main cover plate is located on the inner side of the surrounding wall, and the root of the surrounding wall connected to the main cover plate has an inward transition section.

3. The box cover for high-voltage switchgear according to claim 2, characterized in that: The sealing connection structure comprises a sealing ring installation groove arranged on the end surface of the surrounding wall and a cover body connection hole located outside the sealing ring installation groove, and a sealing ring is installed in the sealing ring installation groove.

4. The box cover for high-voltage switchgear according to claim 3, characterized in that: The cover connecting holes are arranged at both ends of the rounded corner section.

5. The box cover for high-voltage switchgear according to claim 3, characterized in that: An inner flange is formed on the inner side of one end of the surrounding wall facing away from the main cover plate, and a sealing ring mounting groove is arranged on the inner flange.

6. The box cover for high-voltage switchgear according to any one of claims 1 to 5, characterized in that: The wiring harness fixing structure is die-cast on the inner side of the main cover.

7. The box cover for high-voltage switchgear according to any one of claims 1 to 5, characterized in that: Connector mounting holes are provided on the surrounding wall.

8. The box cover for high-voltage switchgear according to any one of claims 1 to 5, characterized in that: The inner side surface of the main cover is die-cast with reinforcing ribs, and the reinforcing ribs are symmetrically arranged with the center of the main cover as the center.

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