Single-arm Micro Air-pressure Pump with Eccentric Swing Arm
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Solution Overview
Problem
Conventional micro pumps are bulky and not suitable for portable devices, limiting their use in applications like portable blood pressure measurement, where compactness and portability are essential.
Innovation Solution
A single-arm micro air-pressure pump device with an air pump body and driving unit, featuring a swing arm mechanism and check valves, which enables efficient air flow management and miniaturization, allowing integration into wearable devices like smartwatches or health bracelets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a conventional micro pump is used for blood pressure measurement, then the pump can deliver gas effectively, but the pump becomes bulky and unsuitable for portable devices
Solution Approach 1:
The pump is divided into separate functional modules: a driving unit with eccentric shaft, a swing arm mechanism, and an air chamber unit with multiple chambers. This segmentation allows each component to be optimized independently and assembled in a compact configuration, reducing overall pump volume while maintaining gas delivery efficiency.
Solution Approach 2:
The pump utilizes a three-dimensional arrangement of air chambers (first, second, and third chambers positioned at different heights and locations) and a swing arm that moves in an arc-shaped trajectory. This spatial optimization allows efficient gas delivery within a minimized footprint, making the pump suitable for portable applications.
2Volume of moving object
If a conventional micro pump is used, then the pump structure is simple, but the pump cannot be easily downsized for portable applications
Solution Approach 1:
The driving unit and air chamber unit are integrated into a single compact assembly where the eccentric shaft directly drives the swing arm which in turn actuates the piston unit within the air chambers. This merging of functions reduces the number of separate components and connections, enabling downsizing without excessive structural complexity.
Solution Approach 2:
The swing arm mechanism serves multiple functions: it converts rotational motion from the eccentric shaft into reciprocating linear motion, acts as a connecting rod, and provides structural support for the piston unit. This multi-functionality reduces the number of separate components needed, simplifying the overall structure while achieving compact dimensions.
3Reliability
If check valves are added to prevent backflow, then gas flow control is improved, but device complexity increases
Solution Approach 1:
The check valve function is extracted as a separate, simple component positioned at the discharge port of the third air chamber. This isolated placement allows the valve to perform backflow prevention without complicating the main pump mechanism, maintaining reliability while minimizing added complexity.
Solution Approach 2:
The check valve is designed to automatically open and close based on pressure differential across it, without requiring external control mechanisms. This self-regulating behavior ensures reliable gas flow control in one direction while adding minimal structural complexity to the overall device.
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 device achieves effective miniaturization, higher air output efficiency, and lower noise, with baffle walls in the second air chamber preventing backflow, making it suitable for portable and wearable applications.
Implementation Method 1
the output shaft is provided with an eccentric shaft and is configured to rotate the eccentric shaft, and the eccentric shaft has an end coupled to the output shaft and an opposite end coupled to the swing arm in order to drive the swing arm into a reciprocating motion
Implementation Method 2
the eccentric shaft has an end coupled to the output shaft and an opposite end coupled to the swing arm in order to drive the swing arm into a reciprocating motion
Implementation Method 3
There are a first-direction check valve between the second air chamber and the first air chamber
Implementation Method 4
a second-direction check valve between the third air chamber and the first air chamber
Implementation Method 5
when the swing arm is moved to the proximal position, the air cup is pushed downward and thereby compresses the first air chamber such that the air in the first air chamber is output to the third air chamber
Data Source
AI summary
A single-arm micro air-pressure pump device, having an air pump body and a driving unit. The air pump body includes a supporting frame, an air chamber unit coupled to a side of the supporting frame, and a swing arm provided on the air chamber unit. The driving unit is fixed on the supporting frame and has an output shaft. The output shaft is provided with an eccentric shaft and is configured to rotate the eccentric shaft, and the eccentric shaft has an end coupled to the output shaft and an opposite end coupled to the swing arm in order to drive the swing arm into a reciprocating motion between at least a proximal position and a distal position with respect to the air chamber unit. The reciprocating motion pushes a piston unit provided on one end of the swing arm and causes the air output.