Lower grounding switch of combined electric appliance cabinet

Abstract

The utility model discloses a lower grounding switch of a combined electric appliance cabinet, which comprises a rack, insulating pillars and a driving shaft are arranged on the rack, static contact seats are arranged at the end parts of the insulating pillars, the insulating pillars are respectively provided with retaining walls at two sides of the static contact seats, the retaining walls are arranged between the adjacent insulating pillars in a retaining manner, and the driving shaft is arranged on the rack. The static contact seat is provided with a static contact piece, the static contact piece is further provided with a wiring hole used for being connected with a cable, the rack is provided with a switch-on and switch-off mechanism used for driving the driving shaft to switch on and switch off, the switch-on and switch-off mechanism is arranged on the side wall of the rack, the driving shaft is provided with a connecting arm, one end of the connecting arm is fixedly connected with the driving shaft, and the other end of the connecting arm is fixedly connected with the driving shaft. And one end of the static contact piece, which is exposed out of the retaining wall, is arranged on a motion trail of the moving contact swinging along with the driving shaft. The structure layout is simpler and more reasonable, the protection meets the requirements, the cost is effectively reduced, and the use reliability is ensured.

Description

Technical Field

[0001] The utility model relates to a lower grounding switch of a combined electrical cabinet. Background Art

[0002] A grounding switch is a mechanical switch that reliably connects electrical equipment or power transmission lines to the earth during both normal and fault conditions. When electrical equipment (such as transformers and circuit breakers) or lines require maintenance, a grounding switch is used to ground the equipment or line, discharging residual charge and preventing electric shock for maintenance personnel. In the event of a ground fault in the system, some grounding switches can cooperate with relay protection devices to quickly isolate the faulty component from the system, minimizing the impact of the accident. Grounding switches can also discharge static electricity accumulated on the surface of lines or equipment after a power outage, preventing harm to personnel or equipment caused by electrostatic discharge. Grounding switches and associated circuit breakers and disconnectors are typically mechanically or electrically interlocked to prevent accidental closing of the circuit breaker or disconnector when the grounding switch is closed, ensuring maintenance safety. Furthermore, the design of grounding switches must ensure safe clearances. Existing small grounding switch enclosures are typically only 500 mm wide, as required by customers, while the required safe clearance to live circuit breaker parts is 220 mm. This makes structural design difficult, hinders miniaturization, and compromises performance. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the utility model provides a lower grounding switch for a combined electrical cabinet, which has a simpler and more reasonable structural layout, meets the protection requirements, effectively reduces costs, and ensures reliability of use.

[0004] To achieve the above-mentioned purpose, the utility model provides a lower grounding switch of a combination electrical cabinet, comprising a frame, an insulating support and a drive shaft are provided on the frame, a static contact seat is provided at the end of the insulating support, and the insulating support is provided with retaining walls on both sides of the static contact seat, the retaining walls are respectively provided between adjacent insulating supports, a static contact piece is provided on the static contact seat, and a wiring hole for connecting a cable is also provided on the static contact piece, an opening and closing mechanism for driving the drive shaft to open and close is provided on the frame, the opening and closing mechanism is provided on the side wall of the frame, a connecting arm is provided on the drive shaft, one end of the connecting arm is fixedly connected to the drive shaft, and the other end is provided with a moving contact, and the end of the static contact piece exposed outside the retaining wall is provided on the motion trajectory of the moving contact as the drive shaft swings.

[0005] The beneficial effects of this arrangement are as follows: by providing retaining walls on both sides of the static contact seat to replace the traditional complex insulating partitions, the protective structure is simplified and, with the help of the physical isolation effect of the retaining walls, the electric field interference between adjacent insulating pillars is effectively avoided, reducing the risk of creepage. The ingenious combination of the retaining walls and the layout of the static contact pieces ensures a stable 220mm net air distance, fully meeting the insulation strength requirements and laying a solid foundation for safe operation in medium and high voltage environments. At the same time, the cable is directly connected to the static contact, which reduces the difficulty of structural layout and makes installation convenient. No additional wiring structure is required, effectively simplifying the overall structure, meeting the installation requirements of narrower boxes, and ensuring the requirements of the power connection distance. The design of the static contact piece extending outward from the retaining wall and accurately falling on the movement trajectory of the moving contact greatly reduces the difficulty of aligning the moving and static contacts. If the traditional opening and closing mechanism is placed on the connecting arm, it is easy to cause the connecting arm area structure to be crowded. The drive shaft needs to avoid the mechanism components and cannot be laid flat, which may compress the air gap between the moving contact and the static contact during opening. However, this structure centrally arranges the opening and closing mechanism on the side wall of the frame, physically separating it from the movement area of ​​the drive shaft and the moving contact. This allows the drive shaft to be completely laid flat on the frame to ensure a safe distance. The drive shaft further drives the connecting arm to swing, and the moving contact can quickly form a reliable contact with the static contact, reducing contact bounce and sparking, and improving the stability of the on-off connection. The integrated and simple structure of the drive shaft, connecting arm, and moving contact reduces the wear and tear of components in the transmission link, reduces the probability of failure, and extends the service life of the equipment. At the same time, fewer parts mean a more streamlined production and assembly process, reducing manufacturing costs by about 15%-20%, and making component replacement more convenient during later maintenance, saving operation and maintenance time and costs.

[0006] As a further configuration of the present invention, a transmission flange is provided on the drive shaft, and the opening and closing mechanism includes a swing arm, a linkage arm and a traction spring. The swing arm is rotatably connected to the side wall of the frame, and a guide column is provided on the swing arm. A guide groove is provided on the side wall of the frame corresponding to the position of the guide column. One end of the traction spring is connected to the side wall of the frame, and the other end is connected to the free end of the guide column. One end of the linkage arm is rotatably connected to the swing arm, and the other end is rotatably connected to the transmission flange.

[0007] The beneficial effects of this arrangement are: this arrangement has a simple structure and is arranged lateraly, which is different from the traditional opening and closing mechanism being arranged on the connecting arm. The traditional structure leads to crowded structure in the connecting arm area, and the drive shaft needs to avoid the mechanism components and cannot be laid flat, which may compress the air gap between the moving contact and the static contact during opening. The present structure concentrates the opening and closing mechanism on the side wall of the frame, and is physically separated from the movement area of ​​the drive shaft and the moving contact, so that the drive shaft can be completely laid flat on the frame to ensure a safe distance. During the opening and closing action, the operating lever first drives the drive shaft to rotate, and the flange drives the linkage arm to rotate, thereby compressing the traction spring. After the traction spring passes the middle, the opening and closing action is quickly driven. This structure is simple, stable and reliable, and has good use effect.

[0008] As a further configuration of the present invention, the static contact seat is also provided with a claw for connecting the fuse, the claw includes a base with a U-shaped cross-section and two claw arms, the base is connected to the static contact seat, the outer wall of the claw arm abuts against the inner wall of the support arm of the base, and the end of the claw arm forms a limiting flange.

[0009] The beneficial effect of this arrangement is as follows: With this arrangement, the fuse claw structure added to the static contact seat significantly improves the functional adaptability of the grounding switch. The combined design of the U-shaped base and the double claw arms allows the static contact seat to be compatible with the fuse connection requirements without additional modification, meeting the specific configuration requirements of different power systems and expanding the scope of application of the equipment; the outer wall of the claw arm and the inner wall of the base arm tightly contact each other to form a double clamping force, which, combined with the anti-slip effect of the end limit flange, can effectively offset the impact force during the insertion and removal of the fuse and the vibration effects during long-term operation, avoiding looseness or poor contact. This structural self-tightening design reduces contact resistance fluctuations, reduces the risk of heating, significantly extends the service life of the fuse and contacts, and improves the operational stability of the equipment.

[0010] As a further configuration of the present invention, a plurality of creepage protrusions are provided on the retaining wall.

[0011] This arrangement offers several benefits: the spaced protrusions extend the surface creepage distance, increasing the path for charge movement along the surface and reducing the risk of flashover in humid and contaminated environments. This design is particularly suitable for high-humidity or dusty working conditions. Furthermore, the protrusions disrupt the continuity of the water film, preventing condensation from forming a continuous conductive layer on the separator surface, thereby enhancing resistance to pollution flashover. Furthermore, the protrusions enhance the mechanical strength of the separator, reducing deformation during long-term use. This balances insulation improvement with structural stability, extending the separator's service life.

[0012] As a further configuration of the present invention, the insulating support is provided with a bottom plate along the circumferential direction, the retaining wall is connected to the bottom plate, and a transition step is provided between the bottom plate and the retaining wall.

[0013] This arrangement offers the following benefits: The baseplate, circumferentially located around the insulating pillars, connects to the retaining wall via a transition step, forming a stable mechanical support structure. The baseplate expands the bearing surface of the insulating pillars, distributing the load. Combined with the stress-buffering effect of the transition step, it effectively reduces stress concentration at the connection between the retaining wall and baseplate, significantly improving overall structural strength and preventing deformation risks from long-term operation or external impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic structural diagram of an embodiment of the present utility model;

[0015] Figure 2 This is a partial enlarged view of the opening and closing mechanism in the embodiment of the utility model;

[0016] Figure 3 This is a partial enlarged view of the position of the claw in the embodiment of the present utility model. DETAILED DESCRIPTION

[0017] The utility model is a combination of electrical cabinets, the lower grounding switch is implemented as follows Figures 1 to 3As shown: it includes a frame 1, on which an insulating support 2 and a drive shaft 5 are provided, a static contact seat 4 is provided at the end of the insulating support 2, and the insulating support 2 is provided with a retaining wall 3 on both sides of the static contact seat 4, the retaining wall 3 is blocked between adjacent insulating supports 2, and a static contact piece 41 is provided on the static contact seat 4, and the static contact piece 41 is also provided with a wiring hole 42 for connecting a cable, and the frame 1 is provided with an opening and closing mechanism 7 for driving the drive shaft 5 to open and close, and the opening and closing mechanism 7 is provided on the side wall of the frame 1, and a connecting arm 51 is provided on the drive shaft 5, one end of the connecting arm 51 is fixedly connected to the drive shaft 5, and the other end is provided with a moving contact 52, and the end of the static contact piece 41 exposed outside the retaining wall 3 is provided on the motion trajectory of the moving contact 52 swinging with the drive shaft 5. The beneficial effect of this arrangement is that, by setting up retaining walls 3 on both sides of the static contact seat 4 to replace the traditional complex insulating partitions, the protective structure is simplified and, with the help of the physical isolation effect of the retaining walls 3, the electric field interference between adjacent insulating pillars 2 is effectively avoided, reducing the risk of creepage. The layout of the retaining walls 3 and the static contact piece 41 is cleverly coordinated to ensure that the 220mm net air distance is stably maintained, fully meeting the requirements of insulation strength, and laying a solid foundation for safe operation in medium and high voltage environments. At the same time, the cable is directly connected to the static contact, which reduces the difficulty of structural layout and makes installation convenient. No additional wiring structure is required, which effectively simplifies the overall structure, meets the installation requirements of narrower boxes, and ensures the requirements of power connection distance. Furthermore, the static contact piece 41 extends outward from the retaining wall 3 and accurately falls on the motion trajectory of the moving contact 52, which greatly reduces the difficulty of aligning the moving and static contacts. If the traditional opening and closing mechanism 7 is set on the connecting arm 51, it is easy to cause the connecting arm 51 area structure to be crowded. The drive shaft 5 needs to avoid the mechanism components and cannot be laid flat, which may compress the air gap between the moving contact 52 and the static contact piece 41 when opening. However, the present structure arranges the opening and closing mechanism 7 centrally on the side wall of the frame 1, physically separating it from the movement area of ​​the drive shaft 5 and the moving contact 52, so that the drive shaft 5 can be completely laid flat on the frame 1 to ensure a safe distance. Furthermore, the drive shaft 5 drives the connecting arm 51 to swing, and the moving contact 52 can quickly form a reliable contact with the static contact piece 41, reducing contact bounce and sparking, and improving the on-off stability. The integrated and simple structure of the drive shaft 5, connecting arm 51 and moving contact 52 reduces the loss of components in the transmission link, reduces the probability of failure, and extends the service life of the equipment. At the same time, fewer components mean a more streamlined production and assembly process, reducing manufacturing costs by about 15%-20%, and making component replacement more convenient during later maintenance, saving operation and maintenance time and costs.

[0018] As a further configuration of the present invention, a transmission flange 53 is provided on the drive shaft 5, and the opening and closing mechanism 7 includes a swing arm 71, a linkage arm 72 and a traction spring 12. The swing arm 71 is rotatably connected to the side wall of the frame 1, and a guide column 73 is provided on the swing arm 71. A guide groove 11 is provided on the side wall of the frame 1 corresponding to the position of the guide column 73. One end of the traction spring 12 is connected to the side wall of the frame 1, and the other end is connected to the free end of the guide column 73. One end of the linkage arm 72 is rotatably connected to the swing arm 71, and the other end is rotatably connected to the transmission flange 53. The beneficial effects of such a setting are: such a setting has a simple structure, and through the lateral arrangement, it is different from the traditional opening and closing mechanism being arranged on the connecting arm 51. The traditional structure causes the connecting arm 51 area structure to be crowded, and the drive shaft 5 needs to avoid the mechanism components and cannot be laid flat, which may compress the air gap between the moving contact 52 and the static contact piece 41 during opening. The present structure concentrates the opening and closing mechanism on the side wall of the frame 1, and is physically separated from the movement area of ​​the drive shaft 5 and the moving contact 52, so that the drive shaft 5 can be completely laid flat on the frame 1 to ensure a safe distance. In the opening and closing action, the operating lever first drives the drive shaft 5 to rotate, and the transmission flange 53 drives the linkage arm 72 to rotate, thereby compressing the traction spring 12. After the traction spring 12 passes the middle, it quickly drives the opening and closing action. This structure is simple, stable and reliable, and has a good use effect.

[0019] As a further feature of the present invention, the static contact seat 4 is further provided with a claw 6 for connecting to a fuse. The claw 6 comprises a base 61 with a U-shaped cross-section and two claw arms 62. The base 61 is connected to the static contact seat 4, and the outer wall of the claw arm 62 abuts against the inner wall of the support arm of the base 61. The end of the claw arm 62 forms a limiting flange 63. The beneficial effect of this arrangement is that the fuse claw 6 structure added to the static contact seat 4 significantly improves the functional adaptability of the grounding switch. The combined design of the U-shaped base 61 and the double claw arms 62 enables the static contact seat 4 to be compatible with fuse connection requirements without additional modification, meeting the specific configuration requirements of different power systems and expanding the scope of application of the equipment. The outer wall of the claw arm 62 tightly abuts against the inner wall of the support arm of the base 61, forming a double clamping force. Combined with the anti-slip effect of the end limiting flange 63, it can effectively offset the impact force during fuse insertion and removal and the vibration effects during long-term operation, avoiding loosening or poor contact. This self-tightening structural design reduces contact resistance fluctuations, lowers the risk of heating, significantly extends the service life of the fuse and contacts, and improves equipment operation stability.

[0020] As a further feature of the present invention, the insulating support 2 is provided with a base plate 31 along its circumference, the retaining wall 3 being connected to the base plate 31, and a transition step 32 being provided between the base plate 31 and the retaining wall 3. This advantageous feature is that the base plate 31 provided circumferentially on the insulating support 2 is connected to the retaining wall 3 via the transition step, forming a stable mechanical support structure. The base plate 31 expands the load-bearing area of ​​the insulating support 2, dispersing the load. Combined with the stress buffering effect of the transition step, this effectively reduces stress concentration at the connection between the retaining wall 3 and the base plate 31, significantly improving the overall structural strength and avoiding the risk of deformation under long-term operation or external force impact.

[0021] The above example is only one preferred specific example of the present invention. Common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention are all included in the protection scope of the present invention.

Claims

1. A lower grounding switch for a combination electrical cabinet, comprising a frame, an insulating support and a drive shaft provided on the frame, a static contact seat provided at the end of the insulating support, characterized in that: The insulating pillar is respectively provided with retaining walls on both sides of the static contact seat, and the retaining walls are provided between adjacent insulating pillars. A static contact piece is provided on the static contact seat, and a wiring hole for connecting a cable is also provided on the static contact piece. The frame is provided with an opening and closing mechanism for driving the drive shaft to open and close the switch, and the opening and closing mechanism is provided on the side wall of the frame. A connecting arm is provided on the drive shaft, one end of the connecting arm is fixedly connected to the drive shaft, and the other end is provided with a moving contact. The end of the static contact piece exposed outside the retaining wall is provided on the motion trajectory of the moving contact swinging with the drive shaft.

2. The lower grounding switch of the combined electrical cabinet according to claim 1, characterized in that: A transmission flange is provided on the drive shaft, and the opening and closing mechanism includes a swing arm, a linkage arm and a traction spring. The swing arm is rotatably connected to the side wall of the frame, and a guide column is provided on the swing arm. A guide groove is provided on the side wall of the frame corresponding to the position of the guide column. One end of the traction spring is connected to the side wall of the frame, and the other end is connected to the free end of the guide column. One end of the linkage arm is rotatably connected to the swing arm, and the other end is rotatably connected to the transmission flange.

3. The lower grounding switch of the combined electrical cabinet according to claim 1, characterized in that: The static contact seat is also provided with a claw for connecting the fuse, and the claw includes a base with a U-shaped cross-section and two claw arms. The base is connected to the static contact seat, and the outer wall of the claw arm abuts against the inner wall of the support arm of the base, and the end of the claw arm forms a limiting flange.

4. The lower grounding switch of the combined electrical cabinet according to claim 1, characterized in that: A plurality of creepage protrusions are arranged on the retaining wall.

5. The lower grounding switch of the combined electrical cabinet according to claim 1, characterized in that: The insulating pillar is provided with a bottom plate along the circumferential direction, the retaining wall is connected to the bottom plate, and a transition step is provided between the bottom plate and the retaining wall.

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