Inflatable Flush Valve Sealing Without Position Detection
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Solution Overview
Problem
Conventional flush valves in vacuum toilets require accurate position detection and control to ensure tight sealing, which is time-consuming and prone to inaccuracies leading to operational issues and potential damage.
Innovation Solution
A flush valve with an inflatable valve member that seals the fluid flow channel when inflated and opens when deflated, eliminating the need for position detection mechanisms by using a balloon-shaped valve member that is inflated or deflated via a pressurized source, ensuring reliable sealing without complex control systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional switches or potentiometers are used to detect valve plate position, then position detection capability is provided, but manufacturing time increases due to required tuning and assembly adjustments
Solution Approach 1:
The patent removes the position detection mechanism (potentiometer or switches) from the system entirely. Instead of detecting position to control the valve, the system uses direct pressure-actuated operation where pressure differential automatically opens or closes the valve based on operational needs, eliminating the need for position sensors and their associated tuning requirements.
Solution Approach 2:
The valve system performs self-regulation through pressure differential. When vacuum is applied to the bowl, the pressure difference automatically opens the valve without requiring external position detection or control signals. The system serves itself by using the operational condition (vacuum presence) to directly actuate the valve.
2Measurement precision
If potentiometers are used for position detection, then valve position can be monitored, but assembly complexity increases due to tuning requirements and potential position errors
Solution Approach 1:
The patent extracts and removes the potentiometer and associated position detection electronics from the system. The valve operation relies solely on pressure differential actuation, which inherently provides reliable open/closed positioning without requiring sensors, tuning, or complex control logic.
Solution Approach 2:
The system uses pneumatic pressure differential to directly actuate the valve. The vacuum pressure in the bowl creates a force that opens the valve, while atmospheric pressure closes it. This pneumatic actuation replaces complex mechanical position detection and control systems with a simple pressure-driven mechanism.
3Reliability
If accurate position detection is implemented, then valve closure tightness can be ensured, but risk of damage from improper closure increases due to potential position errors
Solution Approach 1:
The patent incorporates a compliant sealing element (elastomeric material) that provides inherent cushioning and tolerance compensation. The elastomeric seal can deform to accommodate minor misalignments or position variations, ensuring reliable sealing while preventing damage that might occur with rigid positioning systems.
Solution Approach 2:
The pressure differential actuation system provides inherent protection against improper closure. The vacuum pressure naturally holds the valve open during flushing, and when vacuum is released, atmospheric pressure reliably closes the valve. This pneumatic control eliminates the risk of the valve attempting to close when already closed or closing with excessive force.
4Ease of operation
If conventional plate valves with position detection are used, then flow control is achieved, but manufacturing cost increases due to additional components and tuning procedures
Solution Approach 1:
The patent removes the potentiometer, associated electronics, and complex control mechanisms from the system. The valve is actuated directly by pressure differential, requiring only basic mechanical components and an elastomeric seal, thereby simplifying manufacturing and eliminating costly position detection systems.
Solution Approach 2:
The system changes the actuation parameter from electrical (motor control based on position feedback) to pneumatic (direct pressure differential actuation). This parameter change simplifies the system by eliminating electrical components and control electronics, making the valve easier and less expensive to manufacture while maintaining effective flow control.
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 inflatable valve design provides reliable sealing without the need for position detection, reducing manufacturing time and preventing debris accumulation, while maintaining efficient operation and avoiding damage from improper closure.
Implementation Method 1
an inflatable valve member mounted to the mounting unit such that, when in an inflated state, the valve member extends across the fluid flow channel to prevent flow of fluid past the valve member
Implementation Method 2
when in a deflated state, the valve member does not prevent flow of fluid through the fluid flow channel from the first end to the second end
Data Source
AI summary
A flush valve comprising: a valve housing defining a fluid flow channel between an inlet end and an outlet end; a valve closure member arranged to open and close the fluid flow channel; and a mounting unit attached to the valve housing at a location intermediate the first and second ends to which the valve closure member is mounted; wherein: the valve closure member is an inflatable valve member mounted to the mounting unit such that, when in an inflated state, the valve member extends across the fluid flow channel to prevent flow of fluid past the valve member from the first end to the second end and, when in a deflated state, the valve member does not prevent flow of fluid through the fluid flow channel from the first end to the second end.