Respiratory Pump Rotor Design for Low-Turbulence Gas Flow
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Solution Overview
Problem
Existing respiratory devices face challenges with high power consumption, heat output, fluid turbulence, and stringent component tolerances, particularly in generating rapid pressure and flow changes during ventilation.
Innovation Solution
A positive-displacement pump device with a rotor in a pump chamber, decoupled from rotational motion, and a separating element to manage fluid flow, minimizing turbulence and reducing power demand.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fans are used to generate required flows and pressures, then high flow rate and high dynamics are achieved, but average pneumatic overall efficiency is significantly below 10% and large amounts of heat are created
Solution Approach 1:
The patent replaces the fan's rotational impeller system with a positive displacement pump mechanism using a rotor that moves back and forth in a pump chamber. This mechanical substitution eliminates the turbulent rotational flow of fans and creates controlled laminar flow, improving pneumatic efficiency while maintaining required flow rates for ventilation.
Solution Approach 2:
The patent uses a positive displacement pump design where the rotor's reciprocating motion directly displaces gas volumes through defined suction and pressure spaces. This pneumatic approach creates controlled flow with minimal turbulence and heat generation, achieving over 10% pneumatic efficiency compared to fan systems.
2Stress or pressure
If fans are used to build up pressure with rapid rises in speed, then high pressure increases are achieved, but significant power is required to change rotational energy stored in the fan impeller
Solution Approach 1:
The patent employs a dynamically moving rotor that reciprocates back and forth in the pump chamber rather than rotating continuously. This dynamic motion allows the rotor to create suction and pressure spaces in sequence, achieving rapid pressure increases without the continuous rotational acceleration and deceleration that causes high power consumption in fan impellers.
Solution Approach 2:
The rotor performs periodic reciprocating motion, alternating between creating suction space and pressure space. This periodic action efficiently builds pressure through controlled displacement cycles, avoiding the continuous high-power rotational acceleration required by fan systems to achieve similar pressure rises.
3Object-generated harmful factors
If piston pumps and diaphragm pumps are used as alternatives to fans, then lower turbulence of the outflowing fluid is achieved, but particularly high demands are placed on the component tolerances
Solution Approach 1:
The patent extracts the rotor from the traditional rotating configuration and relocates it to move reciprocatingly within the pump chamber. This extraction from the conventional fan or piston pump design allows for lower turbulence while using simpler component tolerances, as the rotor's motion is constrained by the chamber geometry rather than requiring precise clearances between moving parts.
Solution Approach 2:
The patent employs a rotor design with simpler manufacturing requirements compared to precision piston or diaphragm pumps. The rotor can be made from less precisely dimensioned materials while still achieving the required performance, effectively using a more economically manufacturable component to achieve low turbulence without stringent tolerance requirements.
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 achieves low power demand, reduced turbulence, and improved manufacturing tolerances, enabling efficient and dynamic fluid delivery with minimal heat generation.
Implementation Method 1
pump device (1) according to the invention is designed as a positive-displacement pump
Implementation Method 2
the rotor (4) is mounted eccentrically on a rotatable shaft (13) of a drive means (7) and is decoupled from the rotation with the aid of a decoupling apparatus (15) such that an orbital movement of the rotor (4) can be implemented
Data Source
AI summary
A pump device, a respiratory device and a method for providing a respiratory gas. A specially formed rotor and a corresponding pump chamber are used so that an approximately sinusoidal flow of an out-flowing fluid is possible. With the combination of two pump chambers with rotors driven in a 180° phase-shifted manner to one another, an almost constant flow can be created at a common outlet. In addition, the system is designed to be highly dynamic with simultaneously relatively low energy consumption.