Portable Breathing Machine Fan Noise Reduction
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Solution Overview
Problem
Conventional breathing machines suffer from excessive noise and the risk of water entering the main body when moved, causing damage, and struggle with stable gas pressure and humidity control for patient comfort.
Innovation Solution
A portable breathing machine design featuring a fan noise reduction device with an S-shaped air channel and flexible covers, a cut-off device with a honeycomb rectifying part for flow stabilization, and an anti-backflow water box structure with a silica gel funnel sleeve for omnidirectional prevention of water entry, along with a passive heat and moisture exchanger for humidity adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the fan is placed in a box with thick sound insulation material layer, then the noise is reduced, but the volume and cost increase
Solution Approach 1:
The patent uses flexible sound insulation covers made of thin film materials that can conform to the fan housing contours, providing effective noise reduction without requiring thick rigid insulation layers, thus maintaining a compact volume
Solution Approach 2:
The S-shaped air channel design uses curved pathways instead of straight channels, which reduces turbulence and noise generation at air inlets and outlets, allowing for more space-efficient positioning of components
2Object-affected harmful factors
If the fan is fixed by increased rigid connection parts, then the noise generated by shock is reduced, but the volume and cost increase
Solution Approach 1:
The patent introduces flexible connection elements as intermediaries between the fan and the housing, which decouple the rigid connection that causes shock transmission, reducing noise without requiring additional complex mounting structures
Solution Approach 2:
Flexible covers and connection elements are used to isolate the fan from rigid structural connections, allowing vibration absorption while maintaining structural integrity with minimal additional parts
3Device complexity
If the gas discharged by the fan is directly collected, then the structure is simple, but the data is unstable and patients feel uncomfortable
Solution Approach 1:
The patent incorporates a rectifying structure upstream of the pressure sensor that preconditions the airflow by reducing turbulence and stabilizing flow patterns before measurement, ensuring reliable data without complex additional systems
Solution Approach 2:
The S-shaped air channel design creates smooth curved transitions that gradually redirect and stabilize airflow, eliminating sudden direction changes that would cause turbulence and measurement instability
4Device complexity
If the water box is arranged without anti-backflow structure, then the structure is simple, but water enters the main body when moving, causing damage
Solution Approach 1:
The patent designs the water box connection interface with the main body using a non-return valve mechanism that allows water flow in one direction only, preventing backflow into the main body during movement without requiring complex sealing structures
Solution Approach 2:
A check valve or non-return mechanism acts as an intermediary between the water box and main body, allowing necessary water flow while blocking reverse flow that would occur during device movement, providing protection with minimal structural addition
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 design significantly reduces noise levels below 15 decibels, stabilizes gas flow for accurate pressure measurement, and prevents water from entering the main body, ensuring patient comfort and effective humidity control.
Implementation Method 1
the fan noise reduction device with an S-shaped air channel and flexible covers
Implementation Method 2
the fan hangs from the upper flexible cover through flexible hanging columns
Implementation Method 3
a cut-off device with a honeycomb rectifying part for flow stabilization
Implementation Method 4
an anti-backflow water box structure with a silica gel funnel sleeve for omnidirectional prevention of water entry
Implementation Method 5
silica gel funnel sleeve
Implementation Method 6
along with a passive heat and moisture exchanger for humidity adjustment
Implementation Method 7
passive heat and moisture exchanger
Data Source
AI summary
A portable breathing machine includes a body case (100), wherein: a fan box (101), a cut-off device (108) and a control device (113) are arranged in the body case (100); a fan (8) is arranged in the fan box (101) through a fan noise reduction device (102); an air outlet of the fan box (101) is connected with an internal breathing tube (107); the cut-off device (108) is arranged on the internal breathing tube (107); an air outlet of the cut-off device (108) is connected with an external breathing tube (104) and a mask (105); the fan noise reduction device (102) includes a lower flexible cover (3) and an upper flexible cover (5); the lower and upper flexible covers cooperate to form an enclosed cavity for containing the fan (8). A working noise of the breathing machine is decreased to below 15 decibel.