Three-Position Disconnector Switch Piston Cooling Structure
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Solution Overview
Problem
State-of-the-art switchgear and control gear designs using linear three-position disconnector switches suffer from excessive temperature rise due to inadequate heat dissipation.
Innovation Solution
A three-position disconnector switch design featuring a piston with an inner threaded section and additional holes for air flow, along with enlarged inner and outer surface areas, allows for improved heat dissipation through enhanced air circulation and thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a linear three-position disconnector switch is used in state-of-the-art switchgear design, then the device structure is simple and compact, but excessive temperature rise occurs due to inadequate heat dissipation
Solution Approach 1:
The patent transitions from a traditional linear/discrete heat dissipation approach to a three-dimensional radial heat dissipation structure. The cylindrical piston with circumferential cooling channels distributes heat dissipation in multiple spatial dimensions (radially outward in all directions), significantly increasing the effective heat dissipation surface area without proportionally increasing device volume or structural complexity.
Solution Approach 2:
The piston is designed with circumferential cooling channels that create a porous-like internal structure for fluid flow. These channels allow cooling medium to penetrate through the piston volume, creating multiple internal heat transfer pathways that enhance heat dissipation efficiency without requiring a substantially larger external dimension.
2Temperature
If the piston surface area is enlarged to improve heat dissipation, then heat dissipation efficiency increases, but the device volume increases
Solution Approach 1:
The cooling channels are nested within the piston body itself, utilizing the internal volume of the existing piston structure. The circumferential channels are embedded in the piston wall thickness, allowing heat dissipation surfaces to be created within the existing dimensional envelope rather than requiring additional external volume.
Solution Approach 2:
Instead of increasing piston length or diameter linearly to gain heat dissipation surface area, the patent utilizes the radial dimension by creating circumferential channels around the piston perimeter. This multiplies the effective heat dissipation surface area by distributing cooling pathways around the entire circumference, achieving higher heat dissipation without proportional volume increase.
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 design effectively reduces overheating by facilitating efficient heat distribution and cooling, resulting in improved temperature management and reduced thermal stress on switch components.
Implementation Method 1
improved heat dissipation through enhanced air circulation
Implementation Method 2
improved heat dissipation through enhanced air circulation and thermal conductivity
Data Source
Figure 1a~2
Figure 3a~4b
Figure 5
AI summary
The present invention relates to a three-position disconnector switch, comprising: an earthing contact (1), a power out contact (2), a power in contact (3), a piston (4), and a threaded rod (5). A length of the piston is such that in a first switch position an outer surface of a wall of the piston makes an electrical contact between the power out contact and the power in contact. The length of the piston is such that in a second switch position the outer surface of the wall of the piston does not make an electrical contact with either the earthing contact or the power in contact. The length of the piston is such that in a third switch position the outer surface of wall of the piston makes an electrical contact between the earthing contact and the power out contact. The piston comprises an inner threaded section (7) configured to engage with the threaded rod, wherein a length of the inner threaded section is less than the length of the piston. Rotation of the threaded rod is configured to engage with the inner threaded section to move the switch between the different switch positions.