Fan Blade Cleaning Nozzle for Dust-Laden Gas Handling
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Solution Overview
Problem
Centrifugal fans used for conveying dust-laden gases face efficiency and vibration issues due to dust deposits on impellers and blades, leading to increased energy consumption, imbalances, and frequent shutdowns for cleaning, which results in significant downtime and costs.
Innovation Solution
A fan design featuring a centrally arranged, non-rotatable nozzle head with cleaning nozzles on a truncated cone shape, allowing for continuous targeted cleaning of blade surfaces with a cleaning medium like air or water, controlled based on vibration monitoring, to prevent dust caking and reduce maintenance downtime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the fan operates continuously to maintain productivity, then production output is improved, but dust deposits accumulate on blades leading to increased vibrations and efficiency loss
Solution Approach 1:
The cleaning nozzle is positioned to direct cleaning medium onto the blade surfaces before significant dust deposits can form. By performing preliminary cleaning action continuously during operation, the system prevents dust accumulation that would otherwise lead to vibrations and efficiency loss, allowing continuous productivity without reliability degradation.
Solution Approach 2:
The cleaning nozzle operates continuously during fan operation, maintaining constant cleaning action on the blade surfaces. This continuous useful action prevents dust deposit formation throughout the operational period, eliminating the need to stop production for cleaning while maintaining blade efficiency and low vibration levels.
2Reliability
If the system is shut down for thorough cleaning of blades, then deposit removal is improved, but production downtime increases
Solution Approach 1:
Instead of waiting for dust deposits to accumulate and then shutting down for cleaning, the cleaning nozzle performs preliminary cleaning continuously during operation. This prevents the need for shutdown cleaning by maintaining blade surfaces clean throughout continuous production operation.
Solution Approach 2:
The cleaning operation continues uninterrupted during fan operation, eliminating the need to stop production for blade cleaning. The continuous cleaning action maintains blade cleanliness without causing production downtime, as the cleaning medium is applied continuously during normal operation.
3Ease of operation
If a stationary cleaning nozzle is installed inside the fan, then cleaning capability is improved, but targeted cleaning of deposit areas is insufficient
Solution Approach 1:
The cleaning nozzle is mounted on the impeller hub and rotates together with the impeller, making the nozzle dynamic rather than stationary. This dynamic positioning allows the nozzle to follow the rotation of the impeller and maintain consistent alignment with the blade surfaces, enabling targeted cleaning of the specific areas where dust deposits form on the moving blades.
Solution Approach 2:
The rotating impeller hub serves as an intermediary carrier for the cleaning nozzle, transferring the rotational motion to the nozzle. This intermediary arrangement allows the nozzle to be positioned centrally on the hub while achieving the necessary rotational movement to target the blade surfaces accurately, combining central positioning with dynamic targeting capability.
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 enables extended intervals between thorough cleanings, reduces downtime, and significantly extends the fan's service life by preventing imbalances and bearing damage, while maintaining efficient operation.
Implementation Method 1
a cleaning medium is directed onto the blade surfaces with a cleaning medium such as air or water, in each case with a correspondingly high pressure
Implementation Method 2
cleaning nozzles (5), which direct a cleaning medium under pressure onto the blade surfaces
Implementation Method 3
exiting only under pressure generated by centrifugal forces
Data Source
Figure 1~2
AI summary
A fan, in particular for delivering dust-laden gases, having a rotor (2) which is mounted rotatably in a housing (1) and has blades (3), is configured in such a way that a nozzle head (4) which rotates with the rotor (2) is provided, with cleaning nozzles (5), of which in each case at least one is assigned to a blade (3) and is directed onto it.