Blower Unit Protective Element Design for Low-Noise Suction Devices
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Solution Overview
Problem
Existing blower units for suction devices, such as handheld vacuum cleaners, face challenges in providing reliable protection against contact, low flow resistance, and low noise emission.
Innovation Solution
A blower unit design featuring a blower capsule made of plastic, with an intake-side and exhaust-side bearing made of elastic material, and a protective element with hexagonal openings and a metal grille that maintains a distance from the housing to prevent contact and vibration transmission, reducing noise and flow resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective element with small openings is used to provide contact protection, then safety against contact is improved, but flow resistance increases
Solution Approach 1:
The protective element features a curved outer surface that is convex toward the inlet side, which streamlines the airflow and reduces turbulence. This curvature allows the protective element to maintain small opening sizes for safety while minimizing flow resistance by guiding air smoothly through the openings.
Solution Approach 2:
The protective element is positioned at a specific distance from the blower housing interior surface, creating an air gap that reduces flow resistance. The opening size is optimized within a specific range (3-4 mm diameter) to balance contact protection with airflow efficiency. The curved surface geometry further optimizes flow parameters.
2Volume of moving object
If the protective element is positioned close to the blower housing for compact design, then device compactness is improved, but noise from vibrations increases
Solution Approach 1:
The protective element acts as an intermediary component positioned between the blower housing and the airflow path. It serves dual functions: providing structural support for compact design while simultaneously reducing noise by dampening vibrations generated by airflow turbulence through its curved surface geometry.
3Ease of manufacture
If the protective element directly contacts the blower housing for structural support, then mounting simplicity is improved, but vibration transmission and noise increase
Solution Approach 1:
The protective element is designed as a thin-walled structure with a curved surface that provides flexibility and vibration damping. This thin-film approach allows simple mounting while reducing vibration transmission to the housing, as the flexible structure absorbs vibrational energy rather than transmitting it rigidly.
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 ensures reliable protection against contact, low flow resistance, and reduced noise emission by decoupling vibrations and airflow turbulence, enhancing suction efficiency and user safety.
Implementation Method 1
the suction airflow (along the longitudinal axis) pulls the protective element away from the inside of the blower housing, and especially towards the exhaust side of the blower unit
Implementation Method 2
The intake-side and/or exhaust-side bearing is preferably designed to be elastic (for damping and/or decoupling of vibrations). In particular, the intake-side and/or exhaust-side bearing can each be made of an elastic material, especially rubber.
Data Source
Figure 1
Figure 2a
Figure 2b
AI summary
A blower unit (300) for a suction device (100) is described. The blower unit (300) comprises a blower (200) configured to generate a suction airflow (240) during operation along a flow direction that runs from the intake side to the exhaust side of the blower unit (300). The blower unit (300) further comprises a blower housing (250) in which the blower (200) is arranged, and an intake-side bearing (303) and an exhaust-side bearing (304) for supporting the blower (200) on the inside of the blower housing (250).Furthermore, the blower unit (300) comprises a protective element (302) arranged on the intake-side bearing (303), which is designed to be permeated by the suction airflow (240) and to provide contact protection for the blower (200), wherein the protective element (302) is arranged on the intake-side bearing (303) such that the protective element (302) has a distance (420) to the inside of the blower capsule (250) when the blower (200) is in operation.