An insulating support structure for a high voltage switch core conductive unit

Abstract

The utility model discloses a kind of insulation support structures of high-voltage switch core conductive unit, and its technical solution main points are: core conductive unit includes circuit breaker module and three-position switch module, incoming line copper bar, vacuum arc-extinguishing chamber, outgoing line copper bar etc. are integrally cast fixed in insulating cylinder, form the totally enclosed structure of IP67 protection level;Insulating cylinder outer surface is provided with conductive coating and is grounded at multiple points, inside is separated by part and is upper cavity (for knife gap swing) and lower cavity (for insulation pull rod movement), rear side opening is sealed by mechanism box front end cover. The utility model is through totally enclosed design to get rid of air insulation dependence, improve insulation reliability;Arc is not discharged, cooperate electromagnetic shielding to eliminate partial discharge hidden danger, and explosion safety is high;Integrated layout reduces volume, realizes maintenance-free, high humidity, dust and corrosive gas resistant, environmental adaptability is strong, applicable to coal mine underground and other harsh environment.

Description

Technical Field

[0001] This utility model belongs to the technical field of high-voltage electrical equipment for mining, and in particular relates to an insulating support structure for the core conductive unit of a high-voltage switch. Background Technology

[0002] Currently, the core conductive units of traditional high-voltage switches used in mines (including circuit breaker modules and three-position switch modules) mainly adopt an open-type insulation support structure (solid-sealed poles), which exposes the core conductive units to the air, resulting in the following drawbacks:

[0003] 1. Insulation depends on air: It is susceptible to moisture, dust, and corrosive gases (such as methane and hydrogen sulfide), which can lead to a decrease in insulation performance and even cause flashover accidents.

[0004] 2. Risk of electric arc leakage: Combustible gases (CH4, H2, etc.) exist underground in coal mines, and open structures may cause combustion and explosion.

[0005] 3. Dispersed structure and large size: Multiple components are installed independently, occupying a large space and requiring frequent cleaning for maintenance. Utility Model Content

[0006] Based on this, and in response to the aforementioned technical problems, an insulating support structure for the core conductive unit of a high-voltage switch is provided.

[0007] The technical solution adopted in this utility model is as follows:

[0008] An insulating support structure for a core conductive unit of a high-voltage switchgear is disclosed. The core conductive unit includes a circuit breaker module and a three-position switch module. The circuit breaker module includes an incoming copper rod, a vacuum interrupter, an insulating pull rod, and a flexible connector. One end of the incoming copper rod is connected to the fixed end of the vacuum interrupter. One end of the insulating pull rod locks one end of the flexible connector to the moving end of the vacuum interrupter. The other end of the insulating pull rod is connected to a first drive mechanism within the high-voltage switchgear housing. The three-position switch module includes a disconnector base, a disconnector, a connecting rod, a grounding contact, and an outgoing copper rod. The disconnector base is connected to the other end of the flexible connector. One end of the disconnector is rotatably fixed to the disconnector base. One end of the connecting rod is connected to the disconnector, and the other end is connected to a second drive mechanism within the housing. The grounding contact and the outgoing copper rod are located at the rear and front sides of the disconnector, respectively. The rear end of the outgoing copper rod forms a closing contact. The characteristic feature is that... The device also includes an insulating cylinder, in which the inlet copper rod, vacuum interrupter, and outlet copper rod are cast and fixed. The front ends of the inlet and outlet copper rods extend from the front side of the insulating cylinder. The outer surface of the insulating cylinder has a conductive coating and is grounded at multiple points. The insulating cylinder forms a lower cavity for the insulating pull rod to move back and forth and an upper cavity for the knife switch to swing back and forth. The lower and upper cavities are separated by a partition in the insulating cylinder. The lower cavity is located behind the cavity where the vacuum interrupter is located and is connected to the rear end of the cavity. The rear side of the insulating cylinder has an opening that opens the upper and lower cavities. This opening is sealed by the front end of the mechanism box. The insulating pull rod is located in the lower cavity. The flexible connector is embedded in the partition and its two ends extend into the upper and lower cavities, respectively. The knife switch seat and grounding contact are fixed in the upper cavity. The closing contacts of the knife switch, connecting rod, and outlet copper rod are all located in the upper cavity.

[0009] The beneficial effects of this utility model are as follows:

[0010] I. Significantly improves insulation reliability, eliminating reliance on air insulation.

[0011] This invention completely overcomes the shortcomings of traditional open structures that rely on air insulation by encapsulating the core conductive unit entirely within an insulating cylinder. The insulating cylinder, as a solid insulating medium, effectively isolates the conductive unit from the effects of external humidity, dust, and corrosive gases such as methane and hydrogen sulfide, preventing flashover accidents caused by decreased air insulation performance and significantly improving the long-term stability and reliability of the insulation system.

[0012] II. Enhance explosion-proof safety and eliminate the hidden dangers of arc leakage and partial discharge.

[0013] Zero risk of arc leakage: The fully enclosed structure, combined with the sealing of the rear opening of the insulating cylinder at the front of the mechanism box, can completely confine the arc generated by the opening and closing of the vacuum interrupter inside the insulating cylinder, effectively preventing the arc from coming into contact with combustible gases (such as CH4 and H2) in the coal mine, fundamentally eliminating the risk of explosion accidents and meeting the explosion-proof safety requirements in the mine.

[0014] 360° electromagnetic shielding and partial discharge elimination: The outer surface of the insulating cylinder is coated with a conductive coating and a multi-point grounding design to form a complete electromagnetic shielding layer, which can shield the electromagnetic interference of the internal high-voltage electric field to the outside. At the same time, the conductive coating and grounding design can balance the electric field distribution on the surface of the insulating cylinder, eliminate the hidden danger of partial discharge caused by local field strength concentration, and further improve the safety of underground power use.

[0015] III. Integrated design optimizes structural performance, achieving maintenance-free requirements.

[0016] Traditional structures are bulky and require frequent maintenance (such as regular cleaning) due to the independent installation of multiple components. This invention solves this problem through the following design:

[0017] High spatial integration: The lower chamber (for the movement of the insulating rod) and the upper chamber (for the swing of the knife switch) are separated by a partition inside the insulating cylinder, so that the insulating rod and flexible connector of the circuit breaker module and the knife switch, connecting rod and other moving parts of the three-position switch module are arranged in an orderly manner in the enclosed space, which greatly reduces the overall volume and adapts to the narrow installation environment in the mine.

[0018] Maintenance-free features: The core conductive unit is fully enclosed in an insulating cylinder, preventing external dust and moisture from entering, thus eliminating the need for frequent cleaning or component maintenance; the design of the flexible connector embedded in the partition, the knife switch seat and the grounding contact fixed in the upper cavity further improves structural stability, reduces the failure rate, and enables long-term maintenance-free operation.

[0019] IV. Strong environmental adaptability, broadening downhole application scenarios

[0020] The combination of a fully enclosed insulating cylinder structure and an IP67 protection rating gives the core conductive unit excellent environmental resistance: it can work stably for a long time in harsh environments with high humidity (such as underground water spray and condensation), high dust (such as coal dust and rock dust), and rich in corrosive gases (such as hydrogen sulfide and carbon dioxide). This solves the problem of poor environmental adaptability of traditional open structures and significantly broadens the application range of high-voltage switches in different underground coal mine conditions.

[0021] In summary, this utility model, through its fully enclosed insulating support structure, electromagnetic shielding design, and integrated layout, comprehensively overcomes the defects of the core conductive unit of traditional mining high-voltage switches, achieving significant improvements in insulation reliability, explosion-proof safety, structural compactness, and environmental adaptability, thus providing a strong guarantee for the safe and efficient operation of high-voltage electrical equipment in coal mines. Attached Figure Description

[0022] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments:

[0023] Figure 1 A three-dimensional structural diagram of the insulating support structure of the core conductive unit of a high-voltage switch provided in this embodiment of the utility model;

[0024] Figure 2 This is a schematic diagram of the lower and upper cavities of the insulating cylinder according to an embodiment of the present invention;

[0025] Figure 3 This is a rear view structural diagram of the insulating cylinder according to an embodiment of the present utility model. Detailed Implementation

[0026] The embodiments of this utility model will be described below with reference to the accompanying drawings. It should be noted that the embodiments described in this specification are not exhaustive and do not represent the only embodiments of this utility model. The corresponding embodiments below are only for clearly illustrating the utility model content of this patent and are not intended to limit its implementation. For those skilled in the art, different variations and modifications can be made based on the described embodiments. Any obvious variations or modifications that fall within the technical concept and utility model content of this utility model are also within the protection scope of this utility model.

[0027] like Figure 1 As shown, this utility model embodiment provides an insulating support structure for a core conductive unit of a high-voltage switch, including an insulating cylinder 1100.

[0028] The core conductive unit includes a circuit breaker module and a three-position switch module, such as... Figure 1 As shown, the circuit breaker module includes an incoming copper rod 2110, a vacuum interrupter 2120, an insulating pull rod 2130, and a flexible connector 2140. The three-position switch module includes a knife switch base 2210, a knife switch 2220, a connecting rod 2230, a grounding contact 2240, and an outgoing copper rod 2250.

[0029] The incoming copper rod 2110, vacuum interrupter 2120, grounding contact 2240, and outgoing copper rod 2250 are all cast and fixed inside the insulating cylinder 1100. The incoming copper rod 2110 and vacuum interrupter 2120 are located below the grounding contact 2240 and outgoing copper rod 2250, and the incoming copper rod 2110 is located in front of the vacuum interrupter 2120. The incoming copper rod 2110 is the main circuit component connecting the vacuum interrupter 1220, and its rear end is connected to the fixed end of the vacuum interrupter 1220 by bolts. The front ends of the incoming copper rod 2110 and the outgoing copper rod 2250 both extend from the front of the insulating cylinder 1100. Since both are cast and fixed to the insulating cylinder 1100, the sealing performance between them and the insulating cylinder 1100 is guaranteed.

[0030] The vacuum interrupter 2120 is the core component of the circuit breaker module. Through the excellent insulation of the internal vacuum, it can quickly extinguish the arc and suppress the current after the power supply to the medium and high voltage circuit is cut off.

[0031] The insulating cylinder 1100 is an epoxy resin insulating cylinder with a conductive coating on its outer surface and multiple grounding points, forming 360° electromagnetic shielding, eliminating the risk of partial discharge. Unlike composite insulation, it achieves true "full insulation" and improves the safety of explosion-proof underground. In this embodiment, the conductive coating is a silver nanowire conductive coating.

[0032] The surface of the vacuum interrupter 2120 is pre-coated with a layer of silicone rubber before casting. The silicone rubber, as a buffer layer, can effectively absorb and disperse the internal stress generated by the curing of epoxy resin. It transforms rigid stress into flexible extrusion, protecting the outer shell of the vacuum interrupter.

[0033] like Figure 2 As shown, the insulating cylinder 1100 forms a lower cavity 1110 for the insulating pull rod 2130 to move back and forth and an upper cavity 1120 for the knife switch 2220 to swing back and forth. The lower cavity 1110 and the upper cavity 1120 are separated vertically by a partition 1130 in the insulating cylinder 1100. The lower cavity 1110 is located on the rear side of the chamber where the vacuum interrupter 1220 is located and is connected to the rear end of the chamber.

[0034] The inner surfaces of both the lower cavity 1110 and the upper cavity 1120 are provided with multiple umbrella skirts (wave-shaped or umbrella-shaped protrusions on the inner surface) to extend the creepage distance and prevent insulation breakdown.

[0035] The insulating pull rod 2130 is installed in the lower cavity 1110 to transmit the operating force for breaking / closing the vacuum interrupter, and also has high and low voltage insulation functions.

[0036] Flexible connector 2140 is used to ensure airflow and motion control in the vacuum interrupter, such as... Figure 2As shown, it is embedded in the partition 1130, and its upper and lower ends extend into the upper cavity 1120 and the lower cavity 1110 respectively. The front end of the insulating pull rod 2130 locks the lower end of the flexible connector 2140 to the moving end of the vacuum interrupter 2120.

[0037] The knife switch seat 2210 serves as a rotating support and also functions as a main circuit conductor. It is fixed in the upper cavity 1120 and connected to the upper end of the flexible connector 2140 by bolts.

[0038] The knife switch 2220, the connecting rod 2230, and the grounding contact 2240 are all located in the upper cavity.

[0039] The lower end of the knife switch 2220 is fixed to the knife switch base 2210 by rotating back and forth on a left-right rotating shaft, and the switching functions of connection, isolation and grounding are realized by swinging back and forth.

[0040] Specifically, such as Figure 1 As shown, the knife switch 2220 includes two blades 2221, a bracket 2222, a disc spring 2223, and bolts. The bracket 2222 is clamped between the two blades 2221 and fixed to the blades 2221 by bolts. The disc spring 2223 locks the two ends of the two blades 2221 with a certain force value through the bolts, so that there is a certain clamping force between the two blades 2221. The knife switch 2220 is connected to the knife switch seat 2210 by the clamping force. The knife switch seat 2210 has a rotating shaft, which ensures both the rotational movement of the knife switch 2220 and the reliability of the flow guidance.

[0041] The front end of the connecting rod 2230 is connected to the bracket 2222 in the middle of the knife switch 2220.

[0042] The grounding contact 2240 and the outgoing copper rod 2250 are located on the rear and front sides of the knife switch 2220, respectively. The grounding contact 2240 is connected to the system grounding terminal (the grounding copper busbar in the high-voltage switch mechanism box) to form a grounding circuit and realize the grounding function. The rear end of the outgoing copper rod 2250 forms the closing contact 2251 located in the upper cavity 1120.

[0043] The disconnector 2220 has three positions: the closed position, where the disconnector 2220 rotates to the closing contact 2251 of the outgoing copper rod 2250, and the main circuit is connected; (e.g., ...) Figure 2 As shown, in the isolation position, the disconnect switch 2220 is rotated to the vertical direction, and the main circuit is disconnected; in the grounding position, the disconnect switch 2220 is rotated to the grounding contact 2240, and reliably connected to the system grounding terminal.

[0044] The rear side of the insulating cylinder 1100 has an opening for an upper cavity 1120 and a lower cavity 1110. This opening is covered by the front end seal (IP67 seal) of the high voltage switch mechanism box. The first drive mechanism and the second drive mechanism inside the mechanism box are respectively connected to the rear end of the insulating pull rod 2130 and the connecting rod 2230. They are used to drive the insulating pull rod 2130 to move back and forth linearly to drive the vacuum interrupter 2120 to open and close, and to push the knife switch 2220 to swing back and forth via the connecting rod 2230 to achieve the switching of the working position.

[0045] like Figure 1 As shown, the insulating cylinder 1100 also has an upper insertion hole 1140 and two lower insertion holes 1150 for plugging into external devices. When not in use, they can be sealed with an insulating cover. Both the upper insertion hole 1140 and the lower insertion holes 1150 are provided with electrical connectors 1160.

[0046] The upper insertion hole 1140 is in the vertical direction, and the two lower insertion holes 1150 are in the front-back direction and the vertical direction, respectively. The electrical connectors 1160 in the upper insertion hole 1140 and the lower insertion holes 1150 in the front-back direction are all pendant-shaped conductive clips, which are connected to the corresponding copper rods through wires. The pendant-shaped conductive clips are used to allow external devices to be connected by plugging and unplugging, which is convenient for disassembly. The electrical connectors 1160 in the lower insertion holes 1150 in the vertical direction are threaded electrical interfaces.

[0047] like Figure 3 As shown, the rear side of the insulating cylinder 1100 also has an observation window 1170, which is made of explosion-proof tempered glass. The expansion coefficient of the glass is matched with that of the insulating cylinder 1100 to avoid cracking caused by temperature changes. An LED status indicator can be added to assist visual confirmation.

[0048] The insulating cylinder 1100 has several fixing inserts 1180 on its upper and lower sides for fixing and installing external equipment.

[0049] As can be seen from the above, the insulating support structure for the core conductive unit of a high-voltage switch provided by this utility model embodiment has the following beneficial effects:

[0050] I. Significantly improves insulation reliability, eliminating reliance on air insulation.

[0051] This invention completely overcomes the shortcomings of traditional open structures that rely on air insulation by encapsulating the core conductive unit entirely within an insulating cylinder. The insulating cylinder, as a solid insulating medium, effectively isolates the conductive unit from the effects of external humidity, dust, and corrosive gases such as methane and hydrogen sulfide, preventing flashover accidents caused by decreased air insulation performance and significantly improving the long-term stability and reliability of the insulation system.

[0052] II. Enhance explosion-proof safety and eliminate the hidden dangers of arc leakage and partial discharge.

[0053] Zero risk of arc leakage: The fully enclosed structure, combined with the sealing of the rear opening of the insulating cylinder at the front of the mechanism box, can completely confine the arc generated by the opening and closing of the vacuum interrupter inside the insulating cylinder, effectively preventing the arc from coming into contact with combustible gases (such as CH4 and H2) in the coal mine, fundamentally eliminating the risk of explosion accidents and meeting the explosion-proof safety requirements in the mine.

[0054] 360° electromagnetic shielding and partial discharge elimination: The outer surface of the insulating cylinder is coated with a conductive coating and a multi-point grounding design to form a complete electromagnetic shielding layer, which can shield the electromagnetic interference of the internal high-voltage electric field to the outside. At the same time, the conductive coating and grounding design can balance the electric field distribution on the surface of the insulating cylinder, eliminate the hidden danger of partial discharge caused by local field strength concentration, and further improve the safety of underground power use.

[0055] III. Integrated design optimizes structural performance, achieving maintenance-free requirements.

[0056] Traditional structures are bulky and require frequent maintenance (such as regular cleaning) due to the independent installation of multiple components. This invention solves this problem through the following design:

[0057] High spatial integration: The lower chamber (for the movement of the insulating rod) and the upper chamber (for the swing of the knife switch) are separated by a partition inside the insulating cylinder, so that the insulating rod and flexible connector of the circuit breaker module and the knife switch, connecting rod and other moving parts of the three-position switch module are arranged in an orderly manner in the enclosed space, which greatly reduces the overall volume and adapts to the narrow installation environment in the mine.

[0058] Maintenance-free features: The core conductive unit is fully enclosed in an insulating cylinder, preventing external dust and moisture from entering, thus eliminating the need for frequent cleaning or component maintenance; the design of the flexible connector embedded in the partition, the knife switch seat and the grounding contact fixed in the upper cavity further improves structural stability, reduces the failure rate, and enables long-term maintenance-free operation.

[0059] IV. Strong environmental adaptability, broadening downhole application scenarios

[0060] The combination of a fully enclosed insulating cylinder structure and an IP67 protection rating gives the core conductive unit excellent environmental resistance: it can work stably for a long time in harsh environments with high humidity (such as underground water spray and condensation), high dust (such as coal dust and rock dust), and rich in corrosive gases (such as hydrogen sulfide and carbon dioxide). This solves the problem of poor environmental adaptability of traditional open structures and significantly broadens the application range of high-voltage switches in different underground coal mine conditions.

[0061] In summary, this utility model, through its fully enclosed insulating support structure, electromagnetic shielding design, and integrated layout, comprehensively overcomes the defects of the core conductive unit of traditional mining high-voltage switches, achieving significant improvements in insulation reliability, explosion-proof safety, structural compactness, and environmental adaptability, thus providing a strong guarantee for the safe and efficient operation of high-voltage electrical equipment in coal mines.

[0062] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. An insulating support structure for a core conductive unit of a high-voltage switch, the core conductive unit comprising a circuit breaker module and a three-position switch module, the circuit breaker module comprising an incoming copper rod, a vacuum interrupter, an insulating pull rod, and a flexible connector, one end of the incoming copper rod being connected to the fixed end of the vacuum interrupter, one end of the insulating pull rod locking one end of the flexible connector to the moving end of the vacuum interrupter, the other end of the insulating pull rod being connected to a first drive mechanism within a high-voltage switch mechanism box, the three-position switch module comprising a knife switch base, a knife switch, a connecting rod, a grounding contact, and an outgoing copper rod, the knife switch base being connected to the other end of the flexible connector, one end of the knife switch being rotatably fixed on the knife switch base, one end of the connecting rod being connected to the knife switch, and the other end being connected to a second drive mechanism within the mechanism box, the grounding contact and the outgoing copper rod being located at the rear and front sides of the knife switch, respectively, the rear end of the outgoing copper rod forming a closing contact, characterized in that... It also includes an insulating cylinder, in which the inlet copper rod, vacuum interrupter, and outlet copper rod are all cast and fixed. The front ends of the inlet and outlet copper rods extend from the front side of the insulating cylinder. The outer surface of the insulating cylinder has a conductive coating and is grounded at multiple points. The insulating cylinder forms a lower cavity for the insulating pull rod to move back and forth and an upper cavity for the knife switch to swing back and forth. The lower and upper cavities are separated by a partition in the insulating cylinder. The lower cavity is located behind the cavity where the vacuum interrupter is located and is connected to the rear end of the cavity. The rear side of the insulating cylinder has an opening that opens the upper and lower cavities. This opening is sealed by the front end of the mechanism box. The insulating pull rod is located in the lower cavity. The flexible connector is embedded in the partition and its two ends extend into the upper and lower cavities, respectively. The knife switch seat and grounding contact are both fixed in the upper cavity. The closing contacts of the knife switch, connecting rod, and outlet copper rod are all located in the upper cavity.

2. The insulating support structure for a core conductive unit of a high-voltage switch according to claim 1, characterized in that, The insulating cylinder also has an upper insertion hole and a lower insertion hole for plugging into external devices, and both the upper insertion hole and the lower insertion hole are provided with electrical connectors.

3. The insulating support structure for a core conductive unit of a high-voltage switch according to claim 2, characterized in that, The number of upper insertion holes is one, which is in the front-to-back direction. The number of lower insertion holes is two, which are in the front-to-back direction and the top-to-bottom direction, respectively.

4. The insulating support structure for a core conductive unit of a high-voltage switch according to claim 2, characterized in that, The electrical connector is a threaded electrical interface or a Phillips head conductive clip.

5. The insulating support structure for a core conductive unit of a high-voltage switch according to claim 1, characterized in that, The rear side of the insulating cylinder also has an observation window, which is made of explosion-proof tempered glass, and the glass has an expansion coefficient that matches that of the insulating cylinder.

6. The insulating support structure for a core conductive unit of a high-voltage switch according to claim 1, characterized in that, The conductive coating is a silver nanowire conductive coating.

7. The insulating support structure for a core conductive unit of a high-voltage switch according to claim 1, characterized in that, The insulating cylinder is an epoxy resin insulating cylinder.

8. The insulating support structure for a core conductive unit of a high-voltage switch according to claim 1, characterized in that, The inner surfaces of both the lower and upper cavities are provided with multiple umbrella skirts.

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