Rotary Compressor Discharge Port Segmentation for Pulsation Reduction
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Solution Overview
Problem
Conventional three-cylinder rotary compressors face challenges in reducing discharge loss and discharge pressure pulsation due to limited discharge passage capacity, particularly for the middle cylinder chamber, which affects performance and noise suppression.
Innovation Solution
The design incorporates additional discharge ports and muffler chambers with optimized sizes and configurations to enhance the discharge flow rate and reduce pressure pulsation, allowing for efficient discharge from all cylinder chambers without interference, and utilizes thicker partition plates to increase muffler chamber capacity and flow path length for noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If only one discharge port is provided for each cylinder chamber, then the device complexity is reduced, but the discharge loss and discharge pressure pulsation increase
Solution Approach 1:
The discharge system is segmented into multiple discharge ports for each cylinder chamber, allowing independent discharge paths. This segmentation enables the refrigerant to be discharged more efficiently from each chamber, reducing discharge loss and pressure pulsation while maintaining manageable device complexity through modular port design
2Device complexity
If only one discharge port is provided for each cylinder chamber, then the device complexity is reduced, but the discharge pressure pulsation increases
Solution Approach 1:
Multiple discharge ports are provided for each cylinder chamber to segment the discharge flow paths. This segmentation distributes the discharge pressure pulses across multiple channels, reducing the harmful pressure pulsation effect in each individual port while maintaining overall system efficiency
Solution Approach 2:
A muffler chamber is introduced as an intermediary component between the cylinder chambers and the discharge ports. This muffler chamber acts as a buffer that absorbs and dampens discharge pressure pulsations, reducing noise and harmful pressure variations while allowing efficient refrigerant discharge
3Loss of energy
If the discharge passage capacity is increased, then the discharge loss is reduced, but the device complexity increases
Solution Approach 1:
The discharge passage capacity is increased by providing multiple discharge ports for each cylinder chamber rather than expanding a single port. This segmentation approach distributes the flow across multiple channels, achieving higher total discharge capacity and lower discharge loss while keeping individual port sizes manageable and the overall design modular
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 effectively suppresses discharge loss and pressure pulsation, improving the performance and noise characteristics of the rotary compressor by ensuring efficient discharge from all cylinder chambers and optimizing muffler chamber utilization.
Implementation Method 1
rollers are accommodated in each cylinder chamber. The roller eccentrically rotates in the cylinder chamber, integrally with the rotating shaft, to compress the refrigerant sucked into the cylinder chamber
Implementation Method 2
a muffler chamber is provided between the refrigerant compression units adjacent to each other in the axial direction of the rotating shaft
Data Source
AI summary
According to one embodiment, a rotary compressor includes a compression mechanism unit. The compression mechanism unit includes at least three cylinder bodies interposed between a first bearing and a second bearing, a plurality of partition plates provided between adjacent cylinder bodies, and a plurality of rollers compressing a working fluid in cylinder chambers of the cylinder bodies, and at least three cylinder chambers are partitioned by an end plate of the first bearing, an end plate of the second bearing, and the partition plates. Each of the end plates includes a first discharge port discharging the working fluid to a muffler chamber. Each of a plurality of partition plates includes an intermediate muffler chamber, and a second discharge port discharging the working fluid.