Valve Plate Leaf Spring Gas Circuit Breaker Pressure Regulation
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Solution Overview
Problem
Existing gas-insulated high-voltage circuit breakers are complex and require many components, making them difficult to manufacture and maintain, and materials used in high-temperature applications are costly and not suitable for all operating conditions.
Innovation Solution
A simplified design with a single valve plate and leaf spring that opens above a 2-bar pressure threshold, reducing the number of components and allowing for targeted gas filling and pressure regulation, using standard spring steel suitable for up to 300°C, which is more economical and effective than materials needed for 2500°C temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple overlapping valve plates and springs are used to control gas flow, then gas flow control is achieved, but device complexity increases and manufacturing becomes difficult
Solution Approach 1:
The patent combines multiple valve plates and springs into a single integrated valve plate assembly. The valve plate contains multiple holes that serve different functions, and a single spring provides the necessary elastic force, replacing the previous design with multiple separate components. This merging reduces device complexity while maintaining gas flow control functionality.
Solution Approach 2:
The single valve plate performs multiple functions: it controls gas flow in both directions (from low-pressure to compression volume during closing, and from compression to low-pressure volume during opening), and it regulates pressure through its elastic deformation. The multiple holes in the valve plate serve different purposes, allowing one component to replace several specialized components.
2Reliability
If materials capable of withstanding 2500°C are used for valve plates, then high-temperature arc resistance is improved, but manufacturing cost increases significantly
Solution Approach 1:
The patent changes the temperature parameter threshold by designing the valve plate to withstand only moderate temperatures (up to 300°C) rather than extreme temperatures (2500°C). This is achieved by positioning the valve plate away from the direct arc path and using the elastic deformation mechanism to control gas flow without requiring the plate to be in the high-temperature zone. Standard spring steel is sufficient for this temperature range, dramatically reducing manufacturing costs.
3Reliability
If a valve spring with high restoring force is used, then gas pressure regulation above threshold is improved, but the spring requires a fixed stop limiting its travel
Solution Approach 1:
The patent integrates the stop function directly into the valve body structure rather than using a separate external stop component. The valve body includes a built-in stop that limits the spring's travel, eliminating the need for additional parts. This integration maintains the high restoring force of the spring for reliable pressure regulation while reducing overall device complexity.
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 reduces manufacturing and maintenance complexity, achieves effective gas filling and pressure regulation, and is more cost-effective while maintaining performance for high-voltage applications, with improved safety and efficiency in extinguishing arcs.
Implementation Method 1
a compression device actuated by a drive of the switch with a compression volume filled with insulating gas, in which the insulating gas is compressed to form extinguishing gas when the switch is opened
Implementation Method 2
a leaf spring held on one side and elastically bendable depending on the pressure of the insulating gas in the compression volume, which closes the hole when the switch is closed and releases the hole when the switch is opened
Data Source
Figure 1
Figure 1a
Figure 2a~2d
AI summary
The gas-insulated high-voltage circuit breaker (1) contains a compression volume (4) and a low-pressure volume (5) as well as a valve (6) which connects the two volumes (4, 5) to one another and by means of which insulating gas flows out of the low-pressure volume (5) into the compression volume (4) when the switch closes and gas flows out of the compression volume (4) in the reverse direction into the low-pressure volume (5) when the switch opens above a threshold value of the gas pressure. A simplified embodiment of the switch whilst saving on component parts is achieved in that at least one hole (71) and at least one leaf spring (7), which is held on one side and is elastically bendable depending on the pressure of the insulating gas in the compression volume (4), are formed into a valve plate (9) of the valve (6). The bending spring (7) closes the hole (71) when the switch closes and unblocks it when the switch opens as soon as the pressure of the compressed insulating gas in the compression volume (4) exceeds the value of the gas pressure in the low-pressure space (5) by at least two bar.