Control Valve Seal Axial Guide Wall Segmentation
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Solution Overview
Problem
Existing control valves for rail vehicles face challenges in achieving accurate axial guidance and sealing between pressure chambers, leading to insufficient sealing or guiding effects, which affect the control of brake cylinder pressure.
Innovation Solution
The control valve design includes a housing with an annular partition and a separating element with an axial guide wall, where the guide wall is stably held between the partition and housing walls, allowing for independent axial guidance and sealing between the brake cylinder pressure and setpoint pressure chambers, using a bearing element and a sealing ring to enhance the sealing effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the separating element is guided axially on the housing wall while sealing between pressure chambers, then sealing is achieved, but the guiding accuracy is insufficient
Solution Approach 1:
The patent divides the interaction between the separating element and housing wall into two independent functional segments: one surface dedicated to axial guidance and another surface dedicated to sealing. This segmentation allows each surface to be optimized for its specific function without compromise, resolving the contradiction between guiding accuracy and sealing effectiveness.
Solution Approach 2:
Different surfaces of the separating element are assigned different local qualities: one surface is designed with features for precise axial guidance (such as a guide wall), while another surface is designed for sealing (such as a sealing surface or seal). This local differentiation enables each surface to perform its specific function optimally.
2Reliability
If the seal is positioned radially on the guide wall, then sealing between chambers is improved, but the axial guidance accuracy decreases with increasing brake cylinder pressure
Solution Approach 1:
The patent segments the separating element to have distinct functional surfaces: one surface for axial guidance that maintains constant contact with the housing wall, and another surface for radial sealing. This segmentation ensures that the guidance function remains independent of pressure-induced axial position changes, while the sealing function operates effectively at the new axial position.
Solution Approach 2:
The patent transitions from a single-surface design where guidance and sealing compete for the same interface, to a multi-surface design where guidance occurs on one surface (axial dimension) and sealing occurs on another surface (radial dimension). This dimensional separation allows both functions to operate independently and effectively.
Data Source
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AI summary
The invention relates to a control device (50) for controlling a brake cylinder pressure (16) in a control valve (2), comprising: - a housing (54) with a receiving space, which is divided radially by an annular partition wall (64) into an inner brake cylinder pressure chamber (66) and an outer nominal pressure chamber (68), - a separating element (70), which separates the brake cylinder pressure chamber (66) axially from the nominal pressure chamber (68), and - a pressure source (24) that is arranged to charge the brake cylinder pressure chamber (66) with pressure (44) according to an axial position of the separating element (70), in such manner that the brake cylinder pressure (16) in the brake cylinder pressure chamber (66) counterbalances a nominal pressure in the nominal pressure chamber (68), - wherein the separating element (70) has an axial guide wall (74) that is inserted radially between the annular partition wall (64) and one wall of the housing (54).