Pressure-Differential Seal for Rotating Leakage Flow Control
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Solution Overview
Problem
High-pressure hydraulic seals for rotating machine elements in descaling systems and pressure-generating systems face challenges in maintaining a low-maintenance, low-loss seal, as existing solutions suffer from significant fluid leakage and wear.
Innovation Solution
A sealing device with a tubular housing, upstream and downstream pressure chambers, a sealing element, and a bypass line with a throttle element that reduces pressure difference between the chambers, creating a dynamic sealing force based on the pressure difference to effectively seal high-pressure leakage flows.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealing element is used to seal high-pressure leakage flows on rotating machine elements, then sealing performance is improved, but fluid leakage losses increase significantly
Solution Approach 1:
The pressure chamber is divided into an upstream pressure chamber and a downstream pressure chamber by the sealing element. This segmentation allows the sealing element to experience pressure differential forces that push it against the machine element, improving sealing performance while the bypass line provides a controlled leakage path that reduces overall fluid losses
Solution Approach 2:
A bypass line is introduced as an intermediary element that connects the upstream and downstream pressure chambers. This bypass line with its throttle element creates a controlled leakage path that reduces the overall fluid leakage losses while maintaining the sealing function of the sealing element
2Reliability
If a sealing element rests sealingly against a moving machine element, then sealing performance is improved, but wear of the sealing element increases
Solution Approach 1:
The sealing element is designed to move dynamically between the upstream and downstream pressure chambers. The pressure differential creates forces that push the sealing element against the machine element to maintain sealing, while the element can adjust its position to accommodate wear and maintain contact pressure over time
Solution Approach 2:
The sealing element utilizes the pressure differential between the upstream and downstream pressure chambers to automatically maintain sealing contact. The higher pressure in the upstream chamber creates a force that pushes the sealing element against the machine element, eliminating the need for external actuation or adjustment mechanisms
3Force
If pressure difference between upstream and downstream chambers is increased to improve sealing, then sealing force is improved, but the complexity of pressure control increases
Solution Approach 1:
The system automatically generates the required pressure differential through the natural flow of fluid from the upstream to downstream chamber. The throttle element in the bypass line self-regulates the pressure difference, eliminating the need for external pressure control systems or active feedback mechanisms
Solution Approach 2:
The invention uses hydraulic principles to generate sealing force. The pressure differential between the upstream and downstream pressure chambers, created by fluid flow through the bypass line with throttle element, generates the necessary force to push the sealing element against the machine element
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 significantly reduces fluid leakage losses from 20% to 50% to around 2% to 5%, enhancing the sealing performance and extending the service life of the sealing element while maintaining reliable sealing at high pressures.
Implementation Method 1
a throttle element designed to reduce a pressure of a leakage fluid flowing from the upstream pressure chamber through the bypass line to the downstream pressure chamber by a predetermined pressure difference
Implementation Method 2
By means of a pressure difference obtained by the first pressure and the second predetermined pressure, the sealing element and the housing are displaced against one another with a sealing force
Data Source
AI summary
A sealing device for sealing a leakage flow on a machine element, which is circular in cross section, of a working machine includes a housing, which has an upstream end and a downstream end and through which the machine element extends, an upstream pressure chamber which is arranged at the upstream end of the housing, a downstream pressure chamber which is arranged at the downstream end of the housing, and a sealing element which is arranged between the upstream pressure chamber and the downstream pressure chamber. The sealing element is mounted within the housing and rests sealingly against the machine element. A bypass line runs around the sealing element and fluidly connects the upstream pressure chamber to the downstream pressure chamber. A throttle element designed to reduce the pressure of a flowing leakage fluid by a predetermined pressure difference is arranged in the bypass line.