Sealed Rotary Bearing Damper for Contamination-Free High-Speed Atomizers
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Solution Overview
Problem
Rotary bearings in high-speed applications like rotary atomizers face challenges with contamination risk due to lubrication oil and limited lifespan due to wear and tear from friction, especially in food, dairy, and pharmaceutical processing where contamination is not acceptable.
Innovation Solution
A rotary bearing with a closed, isolated damper space that retains fluid inside using a closable filling port and eliminates conduits and valves, combined with a sealed bearing design and elastic sealing elements to prevent fluid leakage, and incorporates a reservoir space for thermal expansion management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sealed bearings with lubrication oil are used in high-speed rotary atomizers, then the bearings can support high rotational speeds and reduce friction, but there is a risk of lubrication oil contaminating the processed product
Solution Approach 1:
The bearing system is divided into two separate sealed compartments: an inner damper space containing the first fluid (lubrication oil) and an outer damper space containing the second fluid (inert gas or vacuum). This segmentation prevents the lubrication oil from contacting the processed product while maintaining the bearing's load-carrying capacity and damping function.
Solution Approach 2:
A second fluid (inert gas or vacuum) is introduced as an intermediary substance between the lubrication oil and the processed product environment. This intermediary fluid creates a barrier that prevents contamination while allowing the bearing to function properly at high speeds.
2Adaptability or versatility
If conventional dampers with conduits and valves are used to manage thermal expansion, then fluid can be added or removed, but there are additional leakage paths that increase contamination risk
Solution Approach 1:
The harmful elements (conduits, valves, and filling ports) are completely removed from the damper system. Instead of allowing fluid addition/removal during operation, the dampers are filled to their maximum capacity during assembly, eliminating potential leakage paths while maintaining thermal expansion management through the sealed fluid system.
Solution Approach 2:
The damper spaces are designed with specific volume ratios (first damper space: 10-50% of total volume, second damper space: 50-90% of total volume) that accommodate thermal expansion without requiring active fluid management. The compressed second fluid acts as a cushion that absorbs volume changes during operation.
3Ease of operation
If the damper space is open to allow fluid management, then fluid can be added or removed for maintenance, but fluid leakage increases the risk of product contamination
Solution Approach 1:
The damper spaces are filled with their respective fluids during the bearing assembly process before the sealing elements are installed. This preliminary filling action ensures that the dampers are completely sealed and pressurized before entering service, eliminating the need for future fluid management operations and preventing leakage during operation.
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 effectively prevents contamination and extends the lifespan of bearings by maintaining fluid isolation and managing thermal expansion, reducing the risk of product contamination and increasing operational reliability in high-speed applications.
Implementation Method 1
at least one sealing element provided between the outer surface of the inner damper element and the inner surface of the outer damper element, said sealing element confining a damper space
Implementation Method 2
incorporates a reservoir space for thermal expansion management
Implementation Method 3
Rotary bearings in high-speed applications like rotary atomizers face challenges with contamination risk due to lubrication oil and limited lifespan due to wear and tear from friction
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A rotary bearing with a damper comprises an inner bearing element configured for rotation around an axis of rotation (A); an outer bearing element coaxial with the inner bearing element; an inner damper element (33) with an outer surface (34) surrounding the outer bearing element; an outer damper element (35) with an inner surface (36) surrounding the inner damper element; at least one sealing element (37) provided between the outer surface and the inner surface, said sealing element confining a damper space (38) comprising a circumferential film space (38a) defined by a clearance between said outer surface and said inner surface. The damper space contains fluid and is a closed, isolated damper space.