Quick-Release Valve Pneumatic Actuation for Compact Air Brake Design
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Solution Overview
Problem
Existing manual quick-release valves for air brakes have an unfavorably extended design due to mechanical couplings, leading to high mechanical loads and restrictive design specifications, and require high manual force to operate, especially when moving the valve slide from the switching position to the basic position.
Innovation Solution
The directional control valve operates without mechanical couplings, with the slide element opening a channel to the dynamic pressure chamber, allowing fluid from the reference pressure line to fill it, and a membrane deflecting under negative pressure to move the valve pneumatically, eliminating mechanical coupling and allowing for a more compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If mechanical coupling is used to connect the actuating element, slide element, valve slide, and membrane, then the valve can be operated manually, but the design becomes extended and compactness is reduced
Solution Approach 1:
The patent replaces the mechanical coupling system with a pneumatic control system. The membrane responds to pressure differences between the reference pressure line and main air line, pneumatically actuating the valve slide without mechanical linkages. This substitution eliminates the need for extended mechanical couplings while maintaining manual operability through pressure-driven actuation.
Solution Approach 2:
The invention uses pneumatic pressure differences to control the valve operation. The membrane is acted upon by fluid pressure from both the reference pressure line and main air line, creating a pressure-dependent actuation mechanism that replaces mechanical couplings. This pneumatic system allows compact design while enabling manual operation through pressure control.
2Force
If mechanical coupling is used between components, then force transmission is achieved, but mechanical loads on the valve slide become unnecessarily high
Solution Approach 1:
The patent replaces mechanical force transmission through couplings with pneumatic force transmission through pressure differences. The membrane converts pressure differences into pneumatic actuation forces on the valve slide, eliminating the need for mechanical force transmission elements and reducing mechanical loads on the valve slide to only what is necessary for sealing and positioning.
3Ease of manufacture
If mechanical coupling is used to position components, then assembly is achieved, but design specifications become restrictive
Solution Approach 1:
The patent replaces mechanical positioning and assembly requirements with pneumatic connectivity requirements. Components need only be positioned to establish proper fluid pathways and pressure zones, rather than maintaining precise mechanical alignments. This increases design flexibility and reduces restrictive assembly specifications while maintaining functional integrity.
4Reliability
If the valve slide is moved from switching position to basic position against high pressure, then pressure equalization is achieved, but high manual force is required
Solution Approach 1:
The patent replaces direct mechanical force application on the valve slide with pneumatic pressure-driven movement. The membrane accumulates pressure energy from the pressure difference between the reference pressure line and main air line, then releases this energy to move the valve slide automatically. This eliminates the need for high manual force while ensuring reliable pressure equalization through pressure-driven actuation.
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 solution reduces the valve's height by around 40% compared to prior art, allows for easier positioning of components, and ensures fluid pressure equilibrium, reducing the effort required to operate the valve and preventing unnecessary mechanical loads, enabling efficient pressure equalization between the reference and main air lines.
Implementation Method 1
the membrane is acted upon on one side by the fluid pressure in the main air line and on the other side by the fluid pressure in the reference pressure line
Implementation Method 2
an elastic membrane for pressure-dependent closing and opening of a channel from the reference pressure line to a dynamic pressure chamber
Implementation Method 3
a duct is opened from the reference pressure line to atmosphere... a channel from the reference pressure line to the dynamic pressure chamber
Data Source
Figure 1
AI summary
Manually actuatable quick-release valve for reducing the fluid pressure in a reference pressure line (5) to the fluid pressure in a main air line (3) which is suitable for manual release on a compressed air brake unit, comprising an elastic membrane (7) for pressure-dependent closing and opening of a channel (14) from the reference pressure line (5) to a dynamic pressure chamber (21), wherein the membrane (7) is pressurized on one side by fluid pressure in the main air line (3) and on the other side by fluid pressure in the reference pressure line (5). A monostable directional control valve (16) with a valve slide (17) for pressure-dependent closing and holding open of the channel (14), wherein the valve slide (17) is pressurized on one side by fluid pressure in the dynamic pressure chamber (21) and on the other side by fluid pressure in the reference pressure line (5), and which closes the channel (14) in the switched position and opens the channel in the home position, and a manual actuating element (30) which upon actuation moves a monostable slide element (22) into a switched position, wherein said slide element (22) in the home position forms a channel (26) from the dynamic pressure chamber (21) to a chamber (29) connected to the atmosphere (28) in order to allow a through flow of fluid out of the dynamic pressure chamber (21) to the atmosphere (28), wherein in the switched position the slide element (22) opens a further channel (15) from the reference pressure line (5) to the dynamic pressure chamber (21) in order to allow filling of the dynamic pressure chamber (21) with fluid from the reference pressure line (5) independent of the position of the valve slide (17).