Dual-Mode Fluid Flow Control with Clutch Engagement
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Solution Overview
Problem
Anesthesia delivery systems face challenges in maintaining consistent gas flow control during power loss or electronic failure, requiring practitioners to switch between electronic and manual controls, which can be confusing and disruptive during critical procedures.
Innovation Solution
The integration of a dual-mode fluid flow control system that allows electronic control via encoders and proportional valves in electronic mode and manual control via mechanically operated needle valves in manual mode, using a clutch to engage or disengage the control knobs, ensuring continuous flow rate adjustment with the same control knobs regardless of power availability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If electronic control is used for gas flow rate, then control precision and automation are improved, but system reliability deteriorates due to power loss or electronic failure
Solution Approach 1:
The system changes the control mode parameter from electronic to manual based on power availability. When power is available, electronic control with encoder and proportional valve is used; when power is lost, the system automatically switches to manual control mode, allowing the same knob to directly control the needle valve without electronic intervention.
Solution Approach 2:
The clutch mechanism acts as an intermediary between the knob and the needle valve. In electronic mode, the clutch disengages the mechanical connection; in manual mode, the clutch engages to provide direct mechanical coupling, enabling seamless transition between control modes while maintaining system reliability.
2Reliability
If separate manual backup controls are provided, then system reliability is improved, but device complexity increases
Solution Approach 1:
The same control knob serves dual functions: in electronic mode, it acts as an input device for electronic control; in manual mode, it directly controls the needle valve. This multi-functionality eliminates the need for separate manual backup controls, reducing device complexity while maintaining reliability.
Solution Approach 2:
The electronic control path and manual control path are merged into a single integrated system. The knob, clutch, and needle valve are combined such that the mechanical control elements remain available but are selectively engaged or disengaged based on power availability, consolidating what would traditionally be separate systems.
3Measurement precision
If the knob is disengaged from the needle valve in electronic mode, then control precision is improved by preventing unwanted adjustment, but ease of operation deteriorates during mode transitions
Solution Approach 1:
The clutch mechanism dynamically adjusts the mechanical coupling between the knob and needle valve based on operational mode. The system transitions smoothly between engaged and disengaged states, maintaining precision during electronic control while enabling easy manual operation when needed, with the transition automatically managed by the system.
Data Source
AI summary
In various embodiments, a flow selector of a fluid flow control system may be used to select a flow rate of a fluid. When the system is in an electronic mode, an encoder may electronically encode the fluid flow selection. A controller may receive the electronically encoded flow selection and transmit a corresponding control signal to an electronic valve to allow the fluid to flow at the selected flow rate. An engagement device, such as a clutch, may disengage the flow selector from a mechanical valve when the fluid flow control system enters a manual mode. When the system is in a manual mode, the engagement device may engage the flow selector with the mechanical valve, allowing the flow selector to directly control the flow rate of the fluid through the mechanical valve. Applications to gases and anesthesia delivery are disclosed herein. Various alternative components and embodiments are described herein.