Shutter Panel Alignment for Switchgear Contacts
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Solution Overview
Problem
Existing shutters for insulating electrical contacts in switchgears are overly complex, requiring many components and introducing transverse or oblique forces that do not provide adequate protection during the insertion or removal of withdrawable units, making them unsafe and costly.
Innovation Solution
A simplified shutter design using a pair of panels with sliding guides and phase barriers that align openings to allow direct perpendicular motion, reducing complexity and ensuring safe, reliable operation by using spring housings for stable alignment and clearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If complex mechanisms (levers, rocker arms, telescoping rods) are used to open and close shutters, then the shutter can be opened during withdrawable unit installation, but the shutter introduces transverse or oblique forces that compromise safety and reliability
Solution Approach 1:
The patent removes complex intermediate mechanisms (levers, rocker arms, telescoping rods) from the shutter system. The shutter is directly coupled to the withdrawable unit contact cages, eliminating components that introduced transverse or oblique forces. This extraction simplifies the force transmission path to purely axial forces, resolving the contradiction between operability and reliability.
Solution Approach 2:
Instead of using complex mechanisms to open the shutter during installation, the invention inverts the approach by having the shutter automatically open through direct coupling with the contact cages. The withdrawable unit itself, through its normal installation motion, directly opens the shutter without requiring separate complex opening mechanisms, thereby maintaining safety while enabling operation.
2Ease of operation
If many components (levers, rocker arms, telescoping rods) are used in the shutter mechanism, then the shutter can be opened during withdrawable unit installation, but the device complexity increases and cost rises
Solution Approach 1:
The patent extracts and eliminates multiple intermediate components (levers, rocker arms, telescoping rods) from the shutter mechanism. The simplified design directly couples the shutter to the contact cages, reducing the component count while maintaining the shutter opening function during withdrawable unit installation.
Solution Approach 2:
The invention merges the shutter opening function with the normal installation motion of the withdrawable unit. By directly coupling the shutter to the contact cages, the shutter opens automatically as part of the installation process, eliminating the need for separate complex opening mechanisms and reducing overall device complexity.
3Ease of operation
If complex mechanisms (levers, rocker arms, telescoping rods) are used to open shutters, then the shutter can be opened during withdrawable unit installation, but the forces introduced are transverse or oblique rather than perpendicular to contacts
Solution Approach 1:
The patent removes intermediate mechanisms that caused force direction problems. By directly coupling the shutter to the contact cages, the force transmission path is simplified to purely axial forces perpendicular to the contacts, eliminating transverse or oblique force components introduced by levers, rocker arms, and telescoping rods.
Solution Approach 2:
Instead of using complex mechanisms to open the shutter, the invention inverts the approach by having the shutter directly respond to the withdrawable unit's installation motion. The contact cages are directly coupled to the shutter, so the normal axial installation force directly opens the shutter without generating unwanted transverse or oblique forces.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides enhanced safety and reliability by ensuring consistent and safe opening and closing of the shutter, reducing the risk of accidental contact and unauthorized access while maintaining ease of maintenance and installation.
Implementation Method 1
spring housings for stable alignment and clearance
Data Source
Figure 1~2
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Figure 5~6
AI summary
A shutter (20) for insulating electrical contacts (54) includes a first panel (22) having a first opening (30) and a second panel (24) having a second opening (30). The first opening is offset from the second opening when the shutter is in a closed position. The second panel (24) includes a first guide (34) configured to react to a pressure of a phase barrier (60) of an insertable withdrawable unit (10) thereon to move the second panel in a first sliding direction relative to the first panel such that the first and second openings align so as to allow an electrical contact to extend therethrough. A spring housing (100) having a spring disposed therein between at least two support legs (102, 103) is slidably disposable in the first panel (22) and extends through the second panel (24).