Integrated Air Control Mechanism for Miniaturized Sphygmomanometers
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Solution Overview
Problem
Existing sphygmomanometers are large and require electric energy for operation, which hinders miniaturization and does not meet energy conservation and environmental protection requirements due to the use of electromagnetic valves and complex airway structures.
Innovation Solution
A simplified air control mechanism using a first and second housing with flow and guiding grooves, a tower-shaped piston, and an intake-exhaust mechanism without electromagnetic valves, employing grooves and passages for air transmission, and a drive motor with an eccentric rotor for air control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If electromagnetic valve, air pump, leakage valve and air pipe are provided in the sphygmomanometer, then the air control function is achieved, but the device size becomes large and miniaturization is hindered
Solution Approach 1:
The patent combines multiple air control functions (intake, exhaust, sealing) into a single integrated piston structure. The piston integrates the tower-shaped body with multiple chambers, stepped holes, and elastic thin plates that collectively perform functions previously requiring separate electromagnetic valves, air pumps, and leakage valves. This merging significantly reduces device size while maintaining air control reliability.
Solution Approach 2:
The patent uses pneumatic principles where air pressure differential drives the piston movement. The elastic thin plates act as pressure-sensitive elements that open or close passages based on pressure changes. This pneumatic control mechanism eliminates the need for electromagnetic actuators and complex mechanical valves, achieving miniaturization while preserving air control functionality.
2Use of energy by moving object
If electromagnetic valve is used to control the airway, then the valve control function is achieved, but electric energy consumption increases and energy conservation requirements are not met
Solution Approach 1:
The piston structure is designed to automatically respond to pressure changes without external power input. The elastic thin plates deflect under air pressure to open or close passages, and the tower-shaped piston moves based on pressure differential. This self-actuating mechanism eliminates electromagnetic valves entirely, reducing electric energy consumption to zero for the air control function while maintaining full valve control capability.
3Reliability
If flexible pipes are used for air transmission, then air flow is achieved, but air leakage and pipe blocking issues occur
Solution Approach 1:
The patent extracts and eliminates the flexible pipe component from the air transmission system. Instead of using separate pipes, the design incorporates integrated flow passages directly into the housing and piston structure. The flow groove in the housing and stepped holes in the piston create internal air pathways that eliminate the need for external flexible pipes, thereby preventing air leakage, blocking, and detachment issues while reducing structural complexity.
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
Facilitates miniaturization, reduces electric energy consumption, and prevents air leakage, while maintaining accurate pressure detection by eliminating the need for flexible pipes and complex valves.
Implementation Method 1
The piston is provided with an elastic thin plate at a periphery of the stepped hole
Implementation Method 2
The intake-exhaust mechanism includes a drive motor and a seal adjusting mechanism, and the drive motor has an output shaft. The seal adjusting mechanism includes an eccentric rotor
Data Source
AI summary
An air control mechanism and a sphygmomanometer including the air control mechanism are provided. The air control mechanism includes a first housing, a second housing, a tower-shaped piston, and an intake-exhaust mechanism. In an intake state, air in the first chamber sequentially flows through the flow groove, presses against the elastic thin plate, flows through the stepped hole and flows to the exhaust passage through the guiding groove. In an exhaust state, air sequentially flows through the flow passage and the exhaust passage to the guiding groove.