一种负荷开关
By optimizing the structural design of the load switch, including improvements to the moving contact assembly, isolating blade assembly, and grounding system, the problems of unreasonable component layout and mechanical stress dispersion in existing load switches have been solved, resulting in a load switch with high reliability, stability, and ease of operation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 浙江联格电气科技有限公司
- Filing Date
- 2025-07-31
- Publication Date
- 2026-07-17
AI Technical Summary
Existing load switches suffer from problems such as unreasonable component layout, loose connections, insufficient structural strength, inconvenient operation, and inability to effectively distribute mechanical stress, resulting in reliability and stability that cannot meet power demand.
The system employs a parallel arrangement of pads and stationary contact mounting plates on the frame, with moving contact assemblies evenly distributed on the pads. This, combined with the nested structure of the isolation crank arm, isolation blade assembly, and stationary contact assembly, enhances the stability of component connections. The design of the locking screw post and support sleeve provides additional support and electric field shielding. An arc-extinguishing shroud assembly is installed to reduce the risk of electric arcs. The grounding support plate and grounding busbar are rationally arranged to form a complete grounding system.
It achieves a compact and orderly layout of load switches, reduces energy loss and failure probability, improves operational stability and reliability, reduces maintenance costs, enhances mechanical vibration resistance, reduces the risk of corona discharge, and ensures long-term stable operation.
Smart Images
Figure CN224519740U_ABST
Abstract
Claims
1. A load break switch characterized by: The device includes a frame on which a pad and a stationary contact mounting plate are fixedly mounted. The pad and the stationary contact mounting plate are parallel and opposite to each other. Three moving contact assemblies are evenly distributed on the pad at equal intervals. A stationary contact assembly is mounted on the stationary contact mounting plate at the position corresponding to each moving contact assembly.
2. The load break switch of claim 1, wherein: The moving contact assembly includes an isolation crank arm, an isolation blade assembly, and a moving contact connector. The isolation crank arm has a U-shaped shell structure and an internal space for installing the isolation blade assembly. One end of the moving contact connector is mounted on a pad, and the other end extends into the isolation crank arm's receiving space and is connected to the support connection assembly of the isolation blade assembly. The end of the isolation blade assembly extends outward from the isolation crank arm through a rectangular opening and faces the corresponding stationary contact assembly. Adjacent isolation crank arms are connected in series to form an array through a nested structure of protrusions and grooves.
3. The load break switch of claim 2, wherein: The isolation blade assembly includes a support connection assembly and isolation blades installed on both sides of the support connection assembly. The support connection assembly includes a first pair of locking assemblies and a second pair of locking assemblies distributed vertically. Both the first and second pair of locking assemblies include locking screw posts and locking screw heads adapted to the locking screw posts. The locking screw heads extend into the locking screw posts. Each locking screw post and locking screw head is provided with a shield and an isolation spring abutting against the shield at the end away from each other. A support sleeve is also fitted on the locking screw posts of the second pair of locking assemblies. The isolation blades are located on both sides of the support sleeve. The moving contact connector is connected to the first pair of locking assemblies.
4. The load break switch of claim 1, wherein: The stationary contact assembly includes a stationary contact and a stationary contact baffle fixedly mounted on a stationary contact mounting plate. A stationary contact support plate is provided between the stationary contact and the stationary contact baffle. The stationary contact support plate has a U-shaped opening. The stationary contact is mounted on the stationary contact support plate, and part of the stationary contact passes through the U-shaped opening in the stationary contact support plate and abuts against the stationary contact baffle.
5. The load break switch of claim 4, wherein: An arc-extinguishing shield assembly is provided at one end of the stationary contact assembly. The arc-extinguishing shield assembly includes an arc-extinguishing shield and an arc-extinguishing plate disposed inside the arc-extinguishing shield. The bottom of the stationary contact of the stationary contact assembly is provided with two arc-extinguishing support legs that are bent inward at 90 degrees. An arc-extinguishing support plate is horizontally disposed between the bent portions of the two arc-extinguishing support legs. The arc-extinguishing shield is provided with a mounting groove. The arc-extinguishing support legs are inserted into the mounting groove and securely connected to the arc-extinguishing shield by interference fit.
6. The load break switch according to any of claims 1-5, characterized in that: The frame includes a front wall panel and a rear wall panel, a first support plate and a second support plate installed between the front wall panel and the rear wall panel, and a grounding support plate. The first support plate and the second support plate are located at one end of the pad and are arranged vertically. The grounding support plate is located at the other end of the pad. The grounding support plate is provided with a grounding busbar. A grounding knife that cooperates with a corresponding moving contact assembly is installed on the grounding busbar. The grounding knife is provided with a grounding reinforcing bar. The grounding reinforcing bar has a plug-in interface adapted to the grounding knife. The grounding reinforcing bar is sleeved on the inner top wall of the grounding knife through the plug-in interface.