Side-channel blower V-shaped impeller blades
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Solution Overview
Problem
Existing side-channel blowers are not optimal in terms of feed rate and pressure increase, and they generate significant noise due to the behavior of compressible media, with existing designs failing to efficiently manage the flow and pressure of gases without increasing diameter or rotational speed and while maintaining low power consumption.
Innovation Solution
The side-channel blower features V-shaped impeller blades inclined at 5° to 20° in the direction of rotation, a radial gap of 0.03 to 0.1 times the impeller diameter, and a tangentially extending outlet with a circular cross-section, allowing for efficient gas acceleration and reduced noise emissions by enabling a constant exchange between flow channels and minimizing pressure losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional impeller blade designs are used, then the blower can operate, but noise emissions are significantly increased due to compressed gas suddenly accelerating against interruption zone walls
Solution Approach 1:
The interruption zone is designed with gradually increasing cross-sectional area in the direction of gas flow, and the impeller blades are inclined to extend toward the flow channels. This preliminary geometric configuration ensures that compressed gas is gradually decelerated and redirected before reaching the interruption zone, preventing sudden acceleration against walls and reducing noise emissions while maintaining feed rate
2Productivity
If the impeller diameter or rotational speed is increased to improve feed rate and pressure increase, then conveying performance improves, but power consumption increases
Solution Approach 1:
The invention changes the geometric parameters of the impeller blades (inclination angle of 5° to 20° in the direction of rotation) and the interruption zone (gradually increasing cross-sectional area). These parameter optimizations improve flow efficiency and pressure generation, enabling higher feed rates and pressure increase without increasing impeller diameter or rotational speed, thus avoiding additional power consumption
3Ease of manufacture
If impeller blades are designed to extend straightly in radial direction, then manufacturing is simpler, but pressure increase and feed rate are not optimal
Solution Approach 1:
The impeller blades are designed with local quality variation: they are inclined at 5° to 20° in the direction of rotation toward the flow channels. This localized inclination optimizes gas acceleration and pressure generation in critical regions, achieving optimal feed rate and pressure increase while remaining manufacturable
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 enhances the efficiency and pressure increase of the blower, reduces power consumption, and covers a wide range of operating points while minimizing noise emissions, achieving higher feed rates and pressure without increasing diameter or rotational speed.
Implementation Method 1
the fluid conveyed is accelerated by the impeller blades in the circumferential direction, as well as in the radial direction so that a circulating vortex flow is generated in the flow channel
Implementation Method 2
acoustically disturbing pressure surges occur at the beginning of the interruption zone immediately after a medium has flowed over each impeller blade because compressed gas is still present in the pockets between the impeller blades, which gas has not been completely expelled via the outlet and is suddenly accelerated against the walls of the interruption zone when it reaches that zone. This causes significantly increased noise emissions.
Data Source
AI summary
A side-channel blower for an internal combustion engine includes a flow housing, an impeller which rotates in the flow housing, a housing wall which surrounds the impeller, a drive unit which drives the impeller, impeller blades arranged in a radially outer region of the impeller, a radial gap arranged between the impeller and the housing wall, an inlet, an outlet, two flow channels which connect the inlet to the outlet, and an interruption zone arranged between the outlet and the inlet which interrupts the two flow channels in a peripheral direction. The impeller blades open in a radially outward direction. A respective one of the two flow channels is respectively formed axially opposite to the impeller blades in the flow housing. The impeller blades each comprise a V-shaped cross-section.