Compressor unit and refrigeration apparatus
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Solution Overview
Problem
Increasing the number of revolutions of a compressor body in refrigeration systems leads to increased vibrations transmitted to the accumulator, resulting in higher piping stress and noise, due to overlapping peak vibrations at the 1n and 3n frequencies.
Innovation Solution
Optimizing the phase difference between the 1n and 3n frequencies to prevent vibration overlap by setting the phase difference between the transfer functions of the accumulator to −20°≥θ≥60°, where the phase lag is positive, at the maximum number of revolutions of the compressor body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of revolutions of the compressor body is increased to improve productivity, then the compression capacity increases, but the vibrations transmitted to the accumulator increase causing higher piping stress and noise
Solution Approach 1:
The invention utilizes vibration control by adjusting the phase difference between 1n and 3n frequency components to −20°≥θ≥60° at maximum revolutions, creating an antiresonance condition that reduces vibration transmission to the accumulator while maintaining high compression capacity
Solution Approach 2:
The invention changes the phase difference parameter between different frequency components of the compressor body's vibration as a function of rotational speed, specifically setting it to −20°≥θ≥60° at maximum revolutions to achieve vibration reduction while maintaining productivity
2Productivity
If the number of revolutions of the compressor body is increased to improve productivity, then the compression capacity increases, but the noise in the refrigeration apparatus increases
Solution Approach 1:
The invention reduces noise by controlling the mechanical vibration characteristics of the compressor body, specifically by creating an antiresonance condition through phase difference adjustment between 1n and 3n frequency components, thereby reducing vibration transmission that generates noise
Solution Approach 2:
The invention changes the phase difference parameter between frequency components as a function of rotational speed to optimize vibration characteristics and reduce noise generation at high compression capacities
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 approach reduces the peak-to-peak value of accumulator vibration, preventing an increase in vibrations transmitted from the compressor body to the accumulator, even at higher rotational speeds, thereby minimizing noise and piping stress.
Implementation Method 1
a piston configured to rotate eccentrically in the cylinder, and a blade partitioning an interior of a compression chamber of the cylinder into a low-pressure chamber and a high-pressure chamber
Implementation Method 2
A phase difference θ between a phase of a transfer function of the 1n frequency of the accumulator and a phase of a transfer function of the 3n frequency of the accumulator is −20°≥θ≥60° with respect to a peak of the 1n frequency where the phase lag is positive
Implementation Method 3
utilizing antiresonance to minimize vibration transmission from the compressor body to the accumulator
Data Source
AI summary
A compressor unit includes a compressor body including a compression mechanism, and an accumulator connected to the compressor body. The compression mechanism includes a cylinder, a piston to rotate eccentrically in the cylinder, and a blade partitioning an interior of a compression chamber of the cylinder into low and high pressure chambers. A frequency one time an operation frequency n of the compressor body and a frequency three times the operation frequency n of the compressor body are a 1n frequency and a 3n frequency, respectively. A phase difference θ between a phase of a transfer function of the 1n frequency of the accumulator and a phase of a transfer function of the 3n frequency of the accumulator is −20°≥θ≥−60° with respect to a peak of the 1n frequency where the phase lag is positive, at a maximum number of revolutions of the compressor body.