Blower Unit Motor Mounting with Sealing Ring for Noise and Odor Control
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Solution Overview
Problem
Existing blower units face challenges in low-noise operation and odor contamination in air flow, particularly in medical applications where noise and odor perception are critical.
Innovation Solution
The blower unit employs elastic sealing rings to fix the motor within the motor chamber, reducing vibration transmission and preventing odor spread, while an annular passage for cooling air around the motor facilitates efficient heat dissipation without contaminating the air flow, using a stator assembly and strategically placed inlets and outlets to manage airflow and pressure differentials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the motor is fixed by direct contact with the housing walls for efficient cooling, then cooling efficiency is improved, but vibration transmission to the housing increases causing noise
Solution Approach 1:
The patent introduces buffers as intermediary elements between the motor and housing walls. These buffers serve dual functions: they provide thermal conduction path for cooling while simultaneously dampening vibrations to reduce noise transmission to the housing.
Solution Approach 2:
The buffers are made of elastomeric material that combines thermal conductivity properties for heat dissipation with vibration damping properties to reduce noise, creating a composite functional solution that addresses both cooling and noise requirements.
2Temperature
If cooling air passes directly through the motor for efficient heat dissipation, then cooling efficiency is improved, but odors from heated windings and lubricant contaminate the circulated air
Solution Approach 1:
The patent divides the motor chamber into separate zones using sealing rings. The cooling air passage is segmented and sealed to prevent contact with odor-generating surfaces, while maintaining efficient heat dissipation through the motor. This creates distinct functional zones: one for cooling and another for air circulation.
Solution Approach 2:
Sealing rings act as intermediary elements that separate the cooling air passage from the motor components that generate odors. These seals prevent odor-laden air from mixing with the clean circulated air while allowing thermal energy to be dissipated through the motor structure.
3Object-affected harmful factors
If buffers are used to reduce vibration transmission, then noise emission is reduced, but motor fixing complexity increases
Solution Approach 1:
The buffers serve multiple functions simultaneously: mechanical mounting of the motor, vibration damping to reduce noise, and thermal conduction for cooling. This multi-functionality reduces the need for separate components, thereby simplifying the overall structure despite the added functionality.
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
This design achieves low-noise operation and effectively prevents odor contamination in the blown air, ensuring cleaner and quieter operation, especially in medical applications.
Implementation Method 1
at least one of the buffers being a sealing ring which separates the shaft from a passage for cooling air
Implementation Method 2
fixing the motor between walls of the motor chamber by means of buffers, with at least one of the buffers being a sealing ring
Implementation Method 3
Via the metal of the latter, heat from the windings of the motor can be efficiently dissipated and transmitted to the air in the passage for cooling air
Implementation Method 4
rotation of the impeller also drives a flow of air through the motor chamber
Data Source
AI summary
A blower unit, particularly for an apparatus for assisting respiration, comprises a housing (2), an impeller (1) accommodated in an impeller chamber (3) in the housing (2), and a motor (12), connected to the impeller (1) via a shaft (15), which is accommodated in a motor chamber (13) in the housing (2). The motor (12) is fixed between walls (14, 18) of the motor chamber (13) by means of buffers, with at least one of the buffers being a sealing ring (16) which separates the shaft (15) from a passage for cooling air (33) which, in radial section, extends annularly around the motor (12).