Switchgear Insulating Rod Grease Scattering Prevention
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Solution Overview
Problem
The flexibility of device arrangement in switchgear is restricted due to the insulation property degradation caused by grease from the bearing contacting the tank, necessitating additional grease-scattering prevention measures or vertical alignment of the operating rod.
Innovation Solution
A switchgear design featuring an insulating rod extended from outside the container, an insert rotatably supported by the electrified conductor, and a sliding unit with a flange part extending radially from the insulating rod's axis, which accumulates and prevents grease scattering, reducing the need for additional components and enhancing device arrangement flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If grease is used for the bearing to reduce friction, then the bearing can rotate smoothly, but the grease runs down the operating rod and contacts the tank, decreasing insulation property
Solution Approach 1:
The operating rod is divided into two separate components: the insulating rod (outer component) and the insert (inner component). The bearing is mounted on the insert, which is rotatably supported by the electrified conductor. This segmentation allows the bearing and grease to be isolated from the insulating rod, preventing grease from contaminating the insulation surface while maintaining smooth rotation.
Solution Approach 2:
The insert acts as an intermediary component between the bearing and the insulating rod. It provides a rotational interface for the bearing while being electrically connected to the electrified conductor, thereby mediating the mechanical rotation function without compromising the insulation property of the insulating rod.
2Reliability
If additional grease-scattering prevention means are installed, then grease can be prevented from flowing out, but the flexibility of device arrangement is restricted
Solution Approach 1:
By segmenting the operating rod into insulating rod and insert, the grease containment function is inherently built into the structure through the bearing's rotational support on the electrified conductor, eliminating the need for additional grease-scattering prevention components and maintaining arrangement flexibility.
Solution Approach 2:
The harmful function (grease scattering) is extracted and contained within the bearing assembly by mounting the bearing on the insert rather than directly on the insulating rod. This extraction eliminates the need for separate grease-scattering prevention means, preserving device arrangement flexibility.
3Reliability
If the operating rod is arranged in vertical direction of the bearing, then grease can be prevented from adhering on the operating rod, but the flexibility of device arrangement is restricted
Solution Approach 1:
Segmenting the operating rod into insulating rod and insert allows the bearing to be positioned on the insert with rotational support from the electrified conductor. This structural segmentation prevents grease from reaching the insulating rod surface regardless of orientation, eliminating the need for vertical arrangement constraints.
Solution Approach 2:
The insert serves as an intermediary that carries the bearing and provides rotational support through the electrified conductor. This intermediary structure isolates the grease-containing bearing from the insulating rod, allowing flexible arrangement without requiring vertical positioning.
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
This design improves the flexibility of device arrangement by effectively preventing grease scattering and maintaining insulation integrity without additional grease-scattering prevention means, reducing the complexity and enhancing the operational flexibility of the switchgear.
Implementation Method 1
a container (1) in which insulating gas is contained; an insulating rod (5) that is extended from outside of the container (1) toward the movable mechanism (3) while being electrically insulated from the container (1)
Implementation Method 2
it is common to use grease for the bearing to reduce frictions accompanied by the rotation of the operating rod
Data Source
AI summary
A switchgear having an electrified conductor accommodated in a tank in which insulating gas is contained includes a fixed contact connected to the electrified conductor, a movable contact installed to be contactable and separable to and from the fixed contact, an insulating rod that is externally extended from inside of the tank while being electrically insulated from the tank and turned by an operation device, and an insert that is extended from an end of the insulating rod toward the movable contact and is rotatably supported by a holding part installed in the electrified conductor. A flange part that is installed in the insert at a position where the holding part opposes the insulating rod and is extended in a substantially right-angle direction with respect to a direction of a rotation axis of the insulating rod is formed on the insert.