Coaxial Suction Device for Hand-Guided Work Apparatus
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Solution Overview
Problem
Existing suction devices for hand-guided work apparatuses, such as chain saws and angle grinders, face issues with wear and frequent maintenance due to dirt and dust particles in combustion air, leading to reduced engine power and increased maintenance costs, despite using centrifugal separators which require large blowers for effective vacuum creation.
Innovation Solution
A suction device design where the blower, providing cooling air, is mounted coaxially with the cable drum axis, utilizing a channel to guide the dirt-laden air stream from the cyclone filter into the outlet, leveraging existing blower components to create sufficient vacuum for effective extraction without additional weight or space requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a centrifugal separator is used to separate dirt particles from combustion air, then the air quality for the engine is improved, but a large blower with high power requirement is needed to create sufficient vacuum
Solution Approach 1:
The suction device combines the cooling air blower function with the dirt-laden air extraction function. The same blower that provides cooling air to the engine is used to create vacuum for the cyclone separator and extract dirty air, merging two functions into one component to avoid additional power requirements
Solution Approach 2:
The blower is designed to serve multiple purposes: it provides cooling air for the engine and simultaneously creates the vacuum necessary for the cyclone separator to function. This multi-functional design eliminates the need for a separate extraction system
2Productivity
If a large blower diameter is used to achieve sufficient vacuum for dirt-laden air extraction, then the suction performance is improved, but the device complexity and space requirement increase
Solution Approach 1:
The suction device merges the cooling air blower with the dirt extraction function, using the same component for both purposes. This integration allows effective suction performance without requiring an additional large blower system
Solution Approach 2:
The blower serves itself by performing dual functions: cooling the engine and extracting dirt-laden air. The system uses its own existing capacity to achieve extraction without requiring external assistance or additional components
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 configuration ensures effective extraction of dirt-laden air streams, reducing wear and maintenance needs by utilizing existing blower components, maintaining efficient suction performance while minimizing additional components and space requirements.
Implementation Method 1
ambient air containing dirt particles which is sucked in, is divided by the cyclone filter into a first air stream which is largely freed from dirt particles and into a second air stream loaded with dirt particles
Implementation Method 2
DE-AS 25 50 165 describes a suction device for a lawn mower which comprises a cylindrical housing with tangential air inlet openings, the combustion air being removed in the centre of the housing. The tangentially inflowing combustion air forms a vortex so that the air is cleaned as in a cyclone dust separator in which the solid particles (dirt particles) are carried outwards as a result of the centrifugal force.
Implementation Method 3
the blower which provides cooling air for the motor of the work apparatus is mounted rotatably about an axis which is arranged coaxially to the cable drum axis. The housing is designed with a channel which is connected to the inlet and opens in the region of the cable drum axis, whereby the second air stream is effectively guided by the cyclone filter through the channel into the outlet.
Data Source
AI summary
A suction device for a cyclone filter of a hand-guided work apparatus includes a blower which is located in a housing and a starting unit with a cable drum which is rotatably mounted about an axis, wherein ambient air sucked in with dirt particles is divided by the cyclone filter into a first air stream which is largely freed from dirt particles and into a second air stream loaded with dirt particles. The housing has an inlet and an outlet for the second air stream, which has a simple configuration and a good suction performance for air laden with dirt particles. The blower is mounted rotatably about an axis which is arranged coaxially to the cable drum axis and the housing is designed with a channel which is connected to the inlet and opens in the region of the cable drum axis.