Rotary Vacuum Blower Casing Opening for Temperature Control
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Solution Overview
Problem
Air-ring blowers experience excessive heating due to fluid leakage between the delivery and intake zones, leading to temperature rises that can exceed 90-95°C, necessitating shutdowns, especially in warm seasons, despite careful mechanical construction.
Innovation Solution
Incorporating a further opening on the casing that allows communication between the inside and outside environment, with strategically placed through holes or valves to manage fluid recirculation, reducing fluid re-circulation by providing an alternative path for leaked fluid, and optionally using an inverter to adjust impeller rotation speed to compensate for head loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the space between the impeller and casing is minimized to prevent fluid leakage, then fluid passage between delivery and intake mouths is reduced, but friction increases and mechanical construction becomes more difficult
Solution Approach 1:
The internal space of the casing is segmented into distinct zones: a first zone containing the impeller shaft and a second zone for fluid passage. This segmentation allows the impeller to be positioned closely to the casing for efficient fluid sealing while maintaining adequate clearance for rotation, resolving the contradiction between minimizing leakage and ensuring manufacturability.
2Temperature
If machines are installed in airy places to prevent excessive temperature rise, then cooling is improved, but adaptability to different installation environments is reduced
Solution Approach 1:
The harmful recirculating fluid is extracted from the closed system by introducing a third opening that allows it to escape to the external environment. This extraction breaks the recirculation loop that causes overheating, enabling the machine to operate in various installation environments without requiring special cooling conditions.
Solution Approach 2:
A third opening is introduced as an intermediary element between the internal casing space and the external environment. This opening serves as a mediator that allows controlled fluid escape, preventing temperature buildup while maintaining the machine's operational integrity across different installation settings.
3Productivity
If the annular conduit is designed with tight clearance between blades and walls to prevent fluid passage, then efficiency is improved, but friction problems increase
Solution Approach 1:
Different regions of the annular conduit are given different clearance characteristics: the second tract has tight clearance between blades and walls to prevent fluid leakage and maintain efficiency, while the first tract has larger clearance to accommodate friction and allow turbulent fluid movement. This local differentiation resolves the contradiction between efficiency and friction.
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 solution effectively reduces machine temperature by 20-25°C, maintaining performance comparable to existing machines while preventing excessive heating, with minimal impact on head loss, and can be easily applied to known machine types.
Implementation Method 1
During operation, the dynamic action of the blades generates a fluid current in the first tract of the annular conduit from aspiration to delivery
Implementation Method 2
This causes the machine temperature to rise, especially in the casing which, if not properly cooled from outside, can reach 90-95° C. and beyond
Data Source
AI summary
An impeller, set in rotation by a motor, provided with blades and enclosed in a casing which defines a circumferential annular conduit in which the blades turn. The annular conduit exhibits two openings, respectively an induction mouth for aspirating fluid from outside the machine, and a delivery mouth from which the fluid exits from the machine. The machine also comprises a further opening which is neither the induction mouth nor the delivery mouth, afforded on the casing and defining a passage which places an inside of the casing in communication with an outside environment.