Rotary Compressor Vane Chattering Mitigation
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Solution Overview
Problem
Concentric rotary compressors experience vane chattering due to the combined force of centrifugal force and back pressure, leading to increased friction loss, wear, and efficiency reduction, especially when using high-pressure refrigerants like R32, R410a, or CO2.
Innovation Solution
The implementation of an elastic deformation unit in the cylinder, which includes a space portion and an elastic portion, absorbs the impact and collision forces between the vane and the cylinder, thereby reducing friction loss and wear. This unit is designed to intersect the imaginary line passing through the rotational center of the roller and the contact point, effectively mitigating vane chattering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a vane is pushed toward the cylinder inner circumferential surface by combined centrifugal force and back pressure, then compression ratio is improved, but friction loss and wear increase due to strong collision
Solution Approach 1:
The patent introduces a cushioning chamber between the vane and the cylinder inner circumferential surface. This cushioning chamber is filled with refrigerant that acts as a cushioning medium to absorb the collision force when the vane is pushed toward the cylinder by centrifugal force and back pressure, thereby reducing friction loss and wear while maintaining the necessary compression ratio
2Productivity
If a vane rotates with the roller and is pushed toward the cylinder, then compression efficiency is improved, but wear of the vane and cylinder occurs due to repeated collision
Solution Approach 1:
The patent introduces refrigerant in the cushioning chamber as an intermediary substance between the vane and the cylinder inner circumferential surface. This intermediary refrigerant absorbs the collision force through its compressibility, protecting both the vane and cylinder from direct contact and wear while allowing the compression process to continue efficiently
3Quantity of substance
If the number of vanes is increased to reduce compression chamber volume for high-pressure refrigerants, then cooling capability is improved, but friction area and pressure difference increase causing more severe friction loss
Solution Approach 1:
The patent applies cushioning chambers to each vane, allowing the use of multiple vanes for high-pressure refrigerants without proportionally increasing friction loss. The cushioning refrigerant in each chamber absorbs the collision forces, enabling the system to maintain high cooling capability with multiple vanes while controlling energy loss from friction and wear
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 use of the elastic deformation unit significantly reduces friction loss and wear between the vane and the cylinder, enhancing compressor efficiency, preventing initial actuation failures, and ensuring quick cooling and heating effects in cooling and heating devices.
Implementation Method 1
an elastic deformation unit in the cylinder, which includes a space portion and an elastic portion, absorbs the impact and collision forces between the vane and the cylinder
Implementation Method 2
a vane inserted in a roller rotates together with the roller, and is pulled out by centrifugal force and back pressure to come into contact with an inner circumferential surface of a cylinder
Data Source
AI summary
A rotary compressor is provided that may include a casing, a cylinder, a main bearing, a sub bearing, a rotational shaft, a roller, and at least one vane. The cylinder may include at least one elastic deformation unit to absorb impact with the at least one vane. With this structure, a collision force caused due to chattering of the at least one vane may be absorbed to suppress or prevent friction loss and/or wear between the cylinder and the vane, thereby enhancing compressor efficiency, reducing vibration noise, and enabling fast initial actuation.