Oil-Filled Transformer Level Indicator With Permanent Sealing
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Solution Overview
Problem
Existing oil-filled electric transformer level indicators are complex, costly, and prone to sealing issues due to the use of multiple components and gaskets, which can lead to inaccurate readings and safety hazards, especially in harsh environments where gaskets degrade quickly and dirt accumulation is a problem.
Innovation Solution
A simplified oil level indicator design using a hollow plastic body with a permanently coupled transparent closure element, eliminating the need for gaskets through irreversible gripping means like welding or gluing, ensuring hermetic sealing and a smooth surface to prevent dirt accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cylindrical metal body with multiple components and gaskets is used for the level indicator, then hermetic sealing is achieved, but the device complexity and production costs increase significantly
Solution Approach 1:
The patent merges the cylindrical body and closure element into a single integrated piece made of dielectric material, eliminating the need for separate gaskets and multiple sealing components. This integration directly reduces device complexity while maintaining hermetic sealing through the unified structure.
Solution Approach 2:
The patent extracts and eliminates the gasket component entirely by using a monolithic dielectric structure. The sealing function is achieved through the integrated design of the cylindrical body and closure element without requiring separate sealing materials, thereby reducing both component count and assembly complexity.
2Reliability
If gaskets are used to seal the level indicator, then hermetic sealing is achieved, but the reliability deteriorates in harsh environments due to gasket degradation
Solution Approach 1:
The patent replaces degradable gasket materials with a permanent dielectric structure that does not degrade over time. The integrated cylindrical body and closure element made of dielectric material provide long-term sealing reliability without the service life limitations of organic gasket materials exposed to harsh environments.
Solution Approach 2:
The patent uses dielectric material for the entire level indicator structure, including the cylindrical body and closure element. This material choice provides both hermetic sealing and resistance to harsh environmental conditions, eliminating the degradation issues associated with traditional gasket materials while maintaining electrical insulation properties.
3Strength
If a metal cylindrical body is used for the level indicator, then structural strength is achieved, but electrical insulation problems occur due to conductivity
Solution Approach 1:
The patent changes the material parameter from conductive metal to dielectric material for the cylindrical body and closure element. This parameter change simultaneously provides structural strength and electrical insulation, eliminating the harmful electrical conductivity while maintaining the mechanical integrity required for the level indicator function.
4Reliability
If gaskets are used to couple the closure element to the cylindrical body, then hermetic sealing is achieved, but dirt accumulation occurs creating maintenance problems
Solution Approach 1:
The patent merges the cylindrical body and closure element into a single integrated piece without intervening gaskets or sealing components. This elimination of intermediate components removes the gaps and crevices where dirt would accumulate, making the level indicator easily cleanable while maintaining hermetic sealing through the unified structure.
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 reduces production costs, assembly complexity, and maintenance risks by providing a reliable, long-lasting, and accurate oil level indication without the need for gaskets, suitable for harsh environments and outdoor use.
Implementation Method 1
at least one closure element which is at least partially transparent is then permanently applied to the second end to allow such inspection
Data Source
Figure 1~2
AI summary
An oil-filled electric transformer (100) comprising a tank (101) where the oil is contained and provided with an opening (102) wherein a liquid level indicator (1) is at least partially inserted, which in turn comprises: a hollow body (2) open at a first end (3) for the liquid entry and at a second end (4) for the inspection of the liquid level; a closure element (5) of said second end (4) of the hollow body (2) which is transparent and stably coupled to the hollow body (2); irreversible gripping means for the coupling between the closure element (5) and the hollow body (2).