Screw Compressor Bearing Arrangement for High-Speed Load Balance
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Solution Overview
Problem
Existing screw compressor bearings face challenges in achieving high load-bearing capacity and optimal lubrication at high rotational speeds due to conflicting requirements for size and design, leading to reduced performance and increased complexity in lubrication and cooling.
Innovation Solution
A configuration of bearings featuring a cylinder bearing with two collars on the outer ring and a ball bearing with a three-point design, allowing for asymmetric axial load-bearing capacity and improved lubrication, combined with ceramic rolling elements and a polymer cage for reduced centrifugal forces and enhanced vibration damping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If bearings are made larger with larger rolling elements to increase load-bearing capacity, then radial and axial load capacity is improved, but rotational speed capability deteriorates due to increased centrifugal forces and lubrication difficulties
Solution Approach 1:
The bearing set is segmented into two distinct bearing types: a first bearing (cylinder bearing) optimized for radial load with large rolling elements, and a second bearing (ball bearing) optimized for axial load with smaller rolling elements. This segmentation allows each bearing to be optimized for its specific function without compromising rotational speed capability.
Solution Approach 2:
Different bearing locations are assigned different qualities: the first bearing location (radial side) has larger rolling elements for high radial load capacity, while the second bearing location (axial side) has smaller rolling elements for high speed and axial load capacity. Each bearing is locally optimized for its specific load and speed requirements.
2Device complexity
If a single bearing type is used for both radial and axial loads, then device complexity is reduced, but load-bearing capacity in both directions deteriorates
Solution Approach 1:
The bearing system employs local quality optimization by using a cylinder bearing with cylindrical rolling elements at the radial load location and a ball bearing with spherical rolling elements at the axial load location. Each bearing type is locally optimized for its specific load direction, achieving superior bidirectional load capacity.
Solution Approach 2:
The bearing configuration is asymmetric, with the first bearing (cylinder bearing) designed for radial loads and the second bearing (ball bearing) designed for axial loads. This asymmetric arrangement allows each bearing to excel in its primary load direction while maintaining overall system simplicity.
3Stability of the object's composition
If collars are added to bearing rings to improve load distribution and stability, then load-bearing stability is improved, but lubrication accessibility deteriorates due to blocked oil supply paths
Solution Approach 1:
The collar arrangement is asymmetric: the first bearing (cylinder bearing) has collars on the outer ring only, while the second bearing (ball bearing) has collars on the inner ring only. This asymmetric collar placement stabilizes load distribution while maintaining open oil supply paths for lubrication.
Solution Approach 2:
The collar function is segmented between the two bearings: the first bearing's outer ring collars provide radial stability, while the second bearing's inner ring collars provide axial stability. This segmentation allows each bearing to have collars in the optimal location for its specific load type without blocking lubrication.
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 provides the necessary load-bearing capacity for high-speed applications while ensuring effective lubrication and cooling, increasing the maximum rotational speed and service life of the bearings.
Implementation Method 1
combined with ceramic rolling elements and a polymer cage for reduced centrifugal forces
Implementation Method 2
combined with ceramic rolling elements and a polymer cage for reduced centrifugal forces and enhanced vibration damping
Implementation Method 3
the oil is intended to provide lubrication and cooling
Data Source
AI summary
A screw compressor element may have a housing; a cylinder bearing including an inner ring, an outer ring, a raceway, and a cylindrical rolling element that contacts the inner ring and the outer ring at a location of the raceway thereof; and a ball bearing including an inner ring, an outer ring, a raceway, and a ball shaped rolling element that contacts the inner ring and the outer ring at a location of the raceway thereof, wherein a rotor is rotatably arranged by way of the cylinder bearing and the ball bearing.