Diaphragm Pump Noise Reduction via Segmented Air Intake Pathways
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Miniature diaphragm pumps generate undesired audible noise during the air intake portion of the pumping cycle due to the direct path of air intake, which affects their performance and usability in applications requiring quiet operation.
Innovation Solution
The design incorporates a complex passage system with a cavity and multiple pathways that extend in opposite directions, featuring first and second valves to control air flow, and a seal to reduce noise by stabilizing air pressure and creating a maze-like path for noise reduction, thereby minimizing the audible noise produced during air intake.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a direct path is used for air intake through a through hole in the base, then the air intake efficiency is improved, but audible noise increases during the pumping cycle
Solution Approach 1:
The air intake path is segmented into multiple sections: air inlet chamber, passage, cavity, and pump chamber. This segmentation allows the air flow to be divided and redirected through different routes, preventing direct noise transmission while maintaining intake efficiency
Solution Approach 2:
The cavity is nested within the structure, forming an intermediate chamber between the passage and pump chamber. This nested configuration creates a maze-like path that stabilizes air pressure and reduces noise without compromising the air intake function
2Object-generated harmful factors
If a complex passage system with cavity and multiple pathways is implemented, then audible noise is reduced, but device complexity increases
Solution Approach 1:
The cavity serves multiple functions simultaneously: it stabilizes air pressure during intake, creates a maze-like path for noise reduction, and maintains structural integration with the existing pump components. This multi-functionality reduces the need for additional separate noise control devices
Solution Approach 2:
The noise reduction features (cavity, pathways, valves) are merged into the existing pump structure rather than being added as separate components. The passage system is integrated with the air inlet chamber and pump chamber, creating a unified structure that reduces 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
The solution significantly reduces noise by stabilizing air pressure and redirecting noise paths, resulting in a more acceptable sound profile during both air intake and exhaust, enhancing the pump's performance and applicability in noise-sensitive applications.
Implementation Method 1
an eccentric member driven by the output shaft, the eccentric member comprising a plurality of arms moving up and down due to rotation of the output shaft; a diaphragm comprising a plurality of bladders, each of the bladders forming a pump chamber, the bladders being connected with arms of the eccentric member, respectively, such that the pump chambers are compressed and expanded due to movement of the arms
Implementation Method 2
a plurality of first valves arranged to control the flow of air through the channels; an air inlet chamber communicating with the pump chambers via a passage; a plurality of second valves arranged to control the flow of air into the pump chambers from the cavity
Data Source
AI summary
A diaphragm pump includes a motor, an eccentric member driven by the motor, and a diaphragm. The motor includes an output shaft connected with the eccentric member. The eccentric member includes multiple arms which move up and down due to the rotation of the output shaft. The diaphragm has multiple bladders. Each bladder forms a pump chamber. The bladders are connected with the arms such that the bladders are compressed or expanded due to the movement of the arms. The pump has an air exhaust chamber and an air inlet chamber. The air inlet chamber is connected to the pump chambers via a passage. The passage includes a cavity which overlaps the air exhaust chamber in an axial direction of the motor.