Compressor and air conditioner comprising the same
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Solution Overview
Problem
Four-rotor compressors face issues with incomplete counteraction of axial forces due to manufacturing and assembly deviations, leading to random gas axial forces and the need for redundant thrust bearings, which increase costs, mechanical losses, and failure rates.
Innovation Solution
A rotor assembly design with air pressure grooves on the rotor ends and inner walls to create fixed gas axial forces, allowing for a single thrust bearing to manage axial forces, reducing the need for multiple bearings and minimizing friction and collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two sets of thrust bearings are arranged to counteract random gas axial forces, then the compressor can handle axial forces in both directions, but the structure becomes more complex and one set of bearings remains idle
Solution Approach 1:
The patent introduces asymmetric air pressure grooves on the rotor end faces that generate a fixed directional gas axial force. This asymmetric pressure distribution creates a predetermined force direction that counteracts the random gas axial forces, allowing a single thrust bearing to handle all axial forces effectively without requiring symmetric dual-bearing arrangements
Solution Approach 2:
The patent replaces the mechanical thrust bearing system with a pneumatic counterbalance system using air pressure grooves. The gas axial force generated by the pressure grooves substitutes for the mechanical function of the second set of thrust bearings, eliminating the need for redundant mechanical components while maintaining reliability
2Reliability
If two sets of thrust bearings are used to ensure axial force bearing in both directions, then axial force coverage is improved, but costs and mechanical losses increase
Solution Approach 1:
The patent replaces the mechanical thrust bearing system with a pneumatic counterbalance system using air pressure grooves. The gas axial force generated by the pressure grooves substitutes for the mechanical function of the second set of thrust bearings, eliminating the need for redundant mechanical components while maintaining reliability
Solution Approach 2:
The patent extracts and eliminates the redundant second set of thrust bearings from the system. By introducing air pressure grooves that generate a fixed directional gas axial force, the system removes unnecessary mechanical components that cause energy loss, keeping only the essential single thrust bearing
3Reliability
If two sets of thrust bearings are arranged with opposite bearing directions, then both directions of axial force are covered, but the structure becomes more complex and failure rate increases
Solution Approach 1:
The patent introduces asymmetric air pressure grooves on the rotor end faces that generate a fixed directional gas axial force. This asymmetric pressure distribution creates a predetermined force direction that counteracts the random gas axial forces, allowing a single thrust bearing to handle all axial forces effectively without requiring symmetric dual-bearing arrangements
Solution Approach 2:
The patent replaces the mechanical thrust bearing system with a pneumatic counterbalance system using air pressure grooves. The gas axial force generated by the pressure grooves substitutes for the mechanical function of the second set of thrust bearings, eliminating the need for redundant mechanical components while maintaining reliability
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 design reduces costs, simplifies compressor structure, and enhances reliability by eliminating redundant thrust bearings and preventing collisions, thereby improving performance and reducing mechanical inefficiencies.
Implementation Method 1
the first air pressure groove is configured to form a force pointing to the second working portion along the first axis when rotating
Implementation Method 2
the at least one second air pressure groove is configured to form a force pointing to the first working portion
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A rotor assembly (1100), a compressor (1000) and an air conditioner. The rotor assembly (1100) includes a first rotor (200), including a first working portion (210) and a second working portion (220) coaxially arranged, wherein the first working portion (210) and the second working portion (220) are rotatable about a first axis; the first working portion (210) includes a plurality of first helical blades (211), with a first blade groove (212) being formed between adjacent two of the plurality of first helical blades (211); at least one first air pressure groove (213) is provided on a first end face (214) of the first working portion (210) away from the second working portion (220); and the first air pressure groove (213) is configured to form a force in a predetermined direction along the first axis when rotating. The rotor assembly can reduce costs of the compressor, simplify structures of moving parts of the compressor, and improve performance and reliability of the compressor.