Double-Intake Air Pump Wave-Shaped Cam Noise Reduction
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Solution Overview
Problem
Conventional air pumps using eccentric cams suffer from unbalanced components leading to strong vibrations, noise, and reduced efficiency, especially at high rotation rates, resulting in noise pollution and shortened lifespan.
Innovation Solution
A high-efficiency double-intake air pump design featuring a wave-shaped cam and double-ended pistons, with serpentine noise reduction paths and divergent air paths, replacing the eccentric cam structure to minimize axial forces on the motor and reduce noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an eccentric cam structure is used to drive the air pump, then the motor can propel the air bag assembly to inflate alternately, but the components inside the air pump become unbalanced causing strong vibrations and noise
Solution Approach 1:
The air pump is divided into two independent piston chambers (upper and lower) that operate in parallel. Each chamber has its own piston, air inlet, and air outlet, allowing the system to process air through multiple pathways simultaneously. This segmentation balances the mechanical loads and reduces vibrations while maintaining the inflation function.
Solution Approach 2:
The patent combines two piston chambers into a single integrated air pump structure, with both chambers working simultaneously to compress and discharge air. The merged structure shares common components like the motor, housing, and control diaphragms, achieving balanced operation while improving overall efficiency and reducing noise.
2Productivity
If the motor operates at a high rotation rate to improve working efficiency, then the inflation speed increases, but the vibration and noise become more obvious
Solution Approach 1:
By segmenting the air intake into two separate pathways (upper and lower piston chambers), the system can process air at higher rates without concentrating all the mechanical stress and noise generation in a single chamber. This allows high-speed operation while distributing the harmful effects across two balanced pathways.
3Ease of manufacture
If a single air inlet path is used to simplify the structure, then the manufacturing is easier, but the working efficiency is reduced
Solution Approach 1:
The air pump structure is segmented into two parallel processing pathways (upper and lower chambers) that can be manufactured using similar components and assembly procedures. This modular segmentation maintains manufacturing ease while doubling the air processing capacity, thereby improving working efficiency.
4Power
If the eccentric cam structure is used to drive the piston, then the motor can effectively compress the air, but the axial force on the motor increases reducing lifespan
Solution Approach 1:
The air compression function is segmented across two piston chambers that operate in parallel. Each piston handles approximately half the total compression load, distributing the axial force on the motor and reducing stress on individual components. This extends motor lifespan while maintaining effective air compression capability.
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 new design significantly reduces noise, improves working efficiency, extends the air pump's lifespan, and simplifies manufacturing, achieving a compact structure with minimal noise levels below 55 dBA.
Implementation Method 1
The power assembly includes a wave-shaped cam and couples of double-ended pistons, where the double-ended piston is movably connected to a circumferential wall of the wave-shaped cam through a sliding slot defined in the middle of the piston; the wave-shaped cam is arranged in the central chamber composed of the central cylinder of the lower case of the piston chamber and the central cylinder of the upper case of the piston chamber, the wave-shaped cam is connected axially to the motor output shaft
Implementation Method 2
a plurality of serpentine noise reduction paths arranged on the upper end face of the disk-shaped air nozzle, the entrance of the paths is communicated with the air intake groove defined in the side wall of the housing, the exit of the paths is communicated with the corresponding piston chamber air inlets
Data Source
AI summary
Disclosed is a high-efficiency double-intake air pump, comprising a motor, a connector, a housing and a power assembly, and a lower horseshoe-shaped diaphragm, a lower case of a piston chamber, an upper case of a piston chamber, an upper horseshoe-shaped diaphragm, a disk-shaped air nozzle and an air nozzle protection disk, which are provided in the front end of the housing and are connected in series successively and cooperatively in an axial direction, wherein the front end of the motor is arranged in the rear end of the housing via the connector, the air nozzle protection disk is fixedly connected to the end face of the housing, and the power assembly comprises wave-shaped cam and couples of double-ended pistons. The air pump has an artful and compact design structure, high operation efficiency, and a low noise.