Hydraulic Cylinder Leak Detection with Separate Detection and Dust Seals
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Solution Overview
Problem
Existing fluid leakage detection devices face challenges in accurately detecting fluid leaks due to the dual requirements of the dust seal, which must both prevent foreign matter invasion and detect leaks, making it difficult to achieve high detection accuracy.
Innovation Solution
A fluid leakage detection device is designed with a separate detection seal and dust seal, where the detection seal is configured to partition the detection space with the rod seal and has high followability, and a relief valve is used to manage pressure, allowing for the selection of materials based on detection accuracy rather than pressure resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a dust seal is used to partition the detection space, then foreign matter invasion is prevented, but detection accuracy deteriorates because the dust seal cannot provide sufficient sealing against high-pressure fluid leakage
Solution Approach 1:
The invention divides the sealing function into two separate components: a dust seal for preventing foreign matter invasion and a detection seal for ensuring sealing against high-pressure fluid in the detection space. This segmentation allows each component to be optimized for its specific function without compromise.
Solution Approach 2:
The invention extracts the detection space partitioning function from the dust seal and assigns it to a dedicated detection seal. This extraction resolves the contradiction by allowing the dust seal to focus solely on foreign matter prevention while the detection seal handles high-pressure sealing for accurate leak detection.
2Measurement precision
If a soft and stretchable material is used for the detection seal, then detection accuracy is improved through better surface following, but pressure resistance deteriorates
Solution Approach 1:
By separating the dust seal and detection seal into different components, the invention allows the detection seal to be made from soft, stretchable materials optimized for surface following and leak detection accuracy, without needing to compromise pressure resistance in the same component that prevents foreign matter invasion.
Solution Approach 2:
The detection seal acts as an intermediary component between the rod seal and dust seal, specifically designed to partition the detection space and provide accurate leak detection through its ability to follow the piston rod surface profile, while the dust seal handles the foreign matter prevention function.
3Object-affected harmful factors
If a hard material is used for the dust seal, then foreign matter prevention is improved, but detection accuracy deteriorates because the seal cannot follow the piston rod surface profile
Solution Approach 1:
The invention segments the sealing system into two distinct seals: a hard dust seal optimized for scraping and preventing foreign matter invasion, and a soft detection seal optimized for following the piston rod surface profile and providing accurate leak detection through its conformability.
Solution Approach 2:
Different parts of the sealing system are given different material properties: the dust seal uses hard material for scraping capability, while the detection seal uses soft, stretchable material for surface following. This local differentiation of material quality resolves the contradiction between dust prevention and detection accuracy.
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 configuration improves the detection accuracy of fluid leaks by allowing the use of materials with high followability for the detection seal, reducing the risk of seal deterioration and enabling effective detection without compromising dust prevention functions.
Implementation Method 1
a relief valve configured to release pressure in the communication passage by being opened when the pressure in the communication passage reaches a relief pressure
Implementation Method 2
a detection seal provided in the cylinder head, the detection seal being configured to partition the detection space together with the rod seal
Implementation Method 3
a rod seal provided in the cylinder head, the rod seal being configured to seal a gap between the piston rod and the cylinder head
Implementation Method 4
the dust seal being configured to seal the gap by being provided in the cylinder head so as to face outside of the cylinder tube
Data Source
AI summary
A fluid leakage detection device includes: a rod seal provided in a cylinder head, a rod seal being configured to seal an annular gap between a piston rod and the cylinder head; a detection seal configured to seal an annular gap, a detection seal being configured to partition the detection space together with the rod seal; a communication passage in communication with the detection space; a pressure sensor configured to detect the pressure of the working oil guided through the communication passage; and a relief valve configured to release the pressure in the communication passage, wherein the detection seal is provided between the rod seal and a dust seal, the dust seal being configured to seal the annular gap by being provided in the cylinder head so as to face the outside of the cylinder tube.