Compact Low-Noise Rotary Compressor With Holder Isolation
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Solution Overview
Problem
Existing rotary compressors generate high levels of noise and vibration, particularly in compact designs, which can lead to manufacturing defects and reduced production yield due to thermal distortion and misalignment during assembly processes.
Innovation Solution
Incorporation of stator and pump holders to provide physical separation between internal components and the casing, along with damping components at coupling points, to reduce acoustic and vibrational energy transmission, and novel suction line configurations to enhance impedance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If rotary compressor is designed to be compact with reduced volume and weight, then cooling capacity density is improved, but noise and vibration levels increase
Solution Approach 1:
The compressor is divided into separate functional modules: motor assembly, pump assembly, and holder assembly. The holder acts as an intermediate structure that segments the connection between motor and pump, allowing independent optimization of each module while reducing overall noise and vibration transmission.
Solution Approach 2:
The holder serves as an intermediary component between the motor assembly and pump assembly. It provides physical separation and acts as a vibration isolation barrier, reducing the transmission of acoustic and vibrational energy between the rotating components and the casing.
2Object-generated harmful factors
If damping components are added at coupling points to reduce noise and vibration, then noise and vibration levels are reduced, but device complexity increases
Solution Approach 1:
The holder integrates multiple functions into a single component: it provides structural support, physical separation between assemblies, vibration isolation, and acoustic damping. By merging these functions into one element, the overall device complexity is minimized while achieving noise and vibration reduction.
Solution Approach 2:
The holder serves multiple purposes simultaneously: it acts as a mounting structure, a vibration damper, an acoustic barrier, and a spatial separator. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity.
3Manufacturing precision
If stator and pump holders are used to provide physical separation, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The use of separate holder assemblies for the stator and pump allows for independent manufacturing and assembly of each component. This segmentation enables precise manufacturing of each holder to accommodate thermal expansion and misalignment, improving overall assembly precision without requiring the entire compressor to be manufactured as a single precision component.
4Object-generated harmful factors
If suction line configuration is modified to enhance impedance, then noise and vibration are reduced, but device complexity increases
Solution Approach 1:
The suction line configuration is modified by changing geometric parameters such as bend radius, transition angles, and connection point locations. These parameter changes enhance acoustic impedance to reduce noise transmission while maintaining acceptable fluid flow characteristics, achieving noise reduction without adding complex active control mechanisms.
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 reduces noise and vibration levels, improves manufacturing precision, and enhances cooling capacity while maintaining a compact size and weight, thus improving production yield and performance.
Implementation Method 1
The compressor may include a stator holder coupled to the stator and the pump, providing physical separation between the stator and the casing. The compressor may also include a pump holder coupled to the pump and the casing, providing physical separation between the pump and the casing. Such separation, in addition to the optional placement of damping components at various coupling points, may serve to reduce acoustic and vibrational energy throughout the system.
Implementation Method 2
Such separation, in addition to the optional placement of damping components at various coupling points, may serve to reduce acoustic and vibrational energy throughout the system.
Implementation Method 3
the suction line connection of the compressor may also be configured to reduce noise and vibration. For example, the suction line connection may include additional damping components placed adjacent the suction line.
Data Source
AI summary
The present disclosure relates to a low noise, compact rotary compressor configured to damp noise and vibration generated from internal components. The compressor may include a stator holder coupled to the stator and the pump, providing physical separation between the stator and the casing. The compressor may also include a pump holder coupled to the pump and the casing, providing physical separation between the pump and the casing. Additional damping components may be placed at various coupling points within and around the stator holder and/or pump holder. The suction line connection may also be configured to reduce noise and vibration. Aspects of the present disclosure may be applicable for reducing the noise and vibration in a number of fluid displacement devices and BLDC motors.