Ventilator Blower Noise Reduction via Dynamic Blade Adjustment
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Solution Overview
Problem
Non-invasive ventilators generate significant noise due to their blower devices, which affects user comfort and willingness to undergo long-term treatment, as existing solutions fail to adequately address radiated and conducted noise.
Innovation Solution
A noise reduction method and device for ventilators that involves adjusting the angles of first and second blades based on wind pressure feedback to optimize blade angles for reduced noise, integrated with a noise reduction hoop and blower device, utilizing a double-layer impeller system to accelerate air and block noise within annular cavities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the blower device operates at high wind pressure to maintain sufficient air volume, then the ventilator can meet respiratory therapy requirements, but the radiated noise and conducted noise increase significantly
Solution Approach 1:
The patent applies dynamics by making the blade angles adjustable during operation. The first blade angle and second blade angle are dynamically adjusted based on different operating conditions (wind pressure requirements) to optimize the balance between air volume delivery and noise generation, allowing the blower to adapt its performance characteristics in real-time
Solution Approach 2:
The patent changes physical parameters by adjusting blade angles (first blade angle and second blade angle) and revolution speed. By modifying these parameters, the system can operate at different points on the performance curve, selecting conditions that minimize noise while maintaining required air volume and wind pressure
2Object-generated harmful factors
If additional noise reduction devices are installed to reduce radiated noise and conducted noise, then noise levels decrease, but the device complexity and installation requirements increase
Solution Approach 1:
The patent merges the noise reduction function with the existing blower structure by integrating adjustable blade mechanisms directly into the blower device. The first blade and second blade are incorporated as integral components of the blower assembly, combining air moving function with noise control function in a single integrated structure
Solution Approach 2:
The blower device serves itself by incorporating self-adjusting blade mechanisms that automatically optimize blade angles based on operating conditions. The system uses feedback from wind pressure sensors and noise level detection to autonomously adjust its own blade configuration, eliminating the need for external noise reduction devices
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 effectively reduces noise generation while maintaining sufficient wind pressure and air volume, eliminating the need for additional noise reduction devices, thereby simplifying installation and reducing costs.
Implementation Method 1
The present disclosure discloses a noise reduction device based on the noise reduction method of a ventilator, and a noise reduction hoop and a blower device of the ventilator is integrated... the double-layer impeller comprises a connecting rod, and a top impeller and a bottom impeller fixed at both ends of the connecting rod
Implementation Method 2
the first top hood and the second top hood are fixedly connected to form a first annular cavity... the first top hood and the second top hood are respectively fixedly connected with a bottom hood of the blower device, forming a second annular cavity between the first top hood and the second top hood and the bottom hood respectively
Data Source
AI summary
A noise reduction method of a ventilator, comprising the following steps: S1 starting a ventilator and imputing a required wind pressure d at a man-machine interface, and then sending a signal to an actuator through a processor, and adjusting a first blade automatically to a maximum adjustable angle state a′° through the actuator and a second blade to a minimum adjustable angle state b°; S2 regulating a revolution speed, when a wind pressure is d, feeding back a revolution speed c, a conducting noise e1 and a radiated noise f1 to the processor through an acquisition device, and after the processor receives a revolution speed information, sending a command to lock the revolution speed to the actuator through the processor. The present disclosure can effectively solve the poor noise reduction function of the present noise reduction hoop, and can effectively reduce the cost and simplify the installation process.