Anesthesia Flowmeter Float Stability and Air Discharge
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Solution Overview
Problem
The existing flowmeter for anesthesia machines experiences float beating during normal operation, ineffective air discharge due to excessive air resistance, and a complex structure leading to high manufacturing costs.
Innovation Solution
A flowmeter design incorporating a lower valve body, throttle valve assembly, flow tube assembly, upper valve body, and pressure fluctuation suppressing assembly, featuring a sealing gasket and safety valve to stabilize the float and automatically discharge air under high resistance, with a simpler structure and lower production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional flowmeter structure is used, then the float can measure flow, but the float beats during normal operation of the bellows
Solution Approach 1:
A guide rod is introduced as an intermediary component between the float and the housing. The guide rod constrains the float's movement path, preventing lateral beating while maintaining vertical floating motion for flow measurement. This simple intermediary structure resolves the float stability issue without adding complex mechanisms.
Solution Approach 2:
The housing is designed with a localized guide structure (guide rod) only where needed to constrain float movement, rather than redesigning the entire flowmeter structure. This localized intervention maintains float stability while keeping the overall structure simple and cost-effective.
2Manufacturing precision
If the flowmeter outlet has high air resistance, then flow control is precise, but air within the flowmeter cannot be discharged effectively
Solution Approach 1:
An air discharge hole is provided in the piston rod that connects to the interior of the flow tube. This preliminary discharge path allows air to be expelled before high-resistance flow conditions are established, preventing air trapping while maintaining precise flow control capability.
Solution Approach 2:
A dedicated air discharge pathway is extracted from the flowmeter's internal structure through the piston rod. This separate air evacuation route operates independently from the main flow path, enabling effective air removal without compromising flow measurement precision.
3Measurement precision
If a complex flowmeter structure is used, then flow measurement accuracy is improved, but manufacture cost increases
Solution Approach 1:
The flowmeter is segmented into functional modules: a float assembly with guide rod for measurement, a piston assembly with air discharge capability for pressure management, and a housing with integrated flow passages. This modular segmentation maintains measurement accuracy while simplifying manufacturing and assembly processes.
Solution Approach 2:
The piston rod serves multiple functions: it transmits force for flow control, provides an air discharge pathway through its internal hole, and acts as a structural connector. This multi-functionality reduces the number of separate components needed, lowering manufacturing cost while maintaining measurement precision.
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
Prevents float beating, ensures effective air discharge, and reduces pressure automatically, while simplifying the structure and lowering manufacturing costs.
Implementation Method 1
the pressure fluctuation suppressing assembly includes a sealing gasket which is arranged at an air outlet of the vertical airflow passage
Implementation Method 2
the float is arranged within the flow tube
Implementation Method 3
a safety valve arranged on the valve body, and an air inlet of the safety valve is in communication with the horizontal airflow passage
Data Source
AI summary
A flowmeter comprises a lower valve body (1), a throttle assembly, a flow tube assembly, an upper valve body (2), and a pressure fluctuation suppression assembly. An air inlet, an air outlet and an air flow channel connecting the air inlet and the air outlet are arranged in the lower valve body (1); a throttle assembly for adjusting the degree of opening of the air flow channel in the lower valve body (1) is further disposed on the lower valve body (1). The flow tube assembly comprises a flow tube (3), an upper base (4), a lower base (5), and a float (6); a vent hole is provided on each of axial centers of the upper base (4) and the lower base (5); the lower base (5) is arranged at the air outlet of the lower valve body (1); a vertical air flow passage and a horizontal air flow passage are arranged in the upper valve body (2); the upper base (4) is arranged at an air inlet of the vertical air flow passage in the upper valve body (2); the flow tube (3) is disposed between the upper base (4) and the lower base (5) through two ends thereof that are respectively sleeved on protruding portions of the upper base (4) and the lower base (5); the float (6) is disposed in the flow tube (3). The pressure fluctuation suppression assembly comprises a sealing gasket (7), and the sealing gasket (7) is disposed at an air outlet of the vertical air flow passage.