Variable Speed Compressor Bracket Vibration Damping
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Solution Overview
Problem
Variable speed compressors experience high-level vibrations and resonance at lower speeds due to overlapping suspension frequency with spring vibrations, leading to noise and deformation issues, which affects energy efficiency and competitiveness.
Innovation Solution
Incorporating a bracket system between the lower casing and the kit group, with springs positioned between these components, and using vibration-dampening materials for the brackets to reduce resonance frequency and transfer of vibrations, thereby minimizing noise and deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the compressor operates at lower speeds to improve energy efficiency, then energy consumption is reduced, but resonance occurs due to overlapping suspension frequency with spring vibration, causing high-level vibration and noise
Solution Approach 1:
A bracket is introduced as an intermediary component between the spring and the compressor body. This bracket serves as a mediator that decouples the direct vibration transmission path, allowing the spring to provide suspension while the bracket absorbs and dampens vibrations before they reach the compressor body, thereby resolving the resonance issue at lower operating speeds
Solution Approach 2:
The suspension frequency of the spring is modified by changing its physical parameters (such as wire diameter, coil diameter, or number of coils) to shift it away from the operating frequency range of the compressor. This parameter adjustment prevents resonance by ensuring the spring's natural frequency does not overlap with the compressor's operating frequencies, especially at lower speeds
2Object-generated harmful factors
If springs are used to suspend the kit group to reduce vibration transfer, then mechanical vibration transfer is reduced, but the suspension frequency overlaps with operating frequency at lower speeds, causing resonance
Solution Approach 1:
The bracket acts as an intermediary element inserted between the spring and the kit group/compressor body. This intermediary structure provides an additional degree of freedom and damping mechanism, allowing the spring to fulfill its vibration isolation function while the bracket prevents direct resonance coupling by distributing and dissipating vibrational energy
Solution Approach 2:
The bracket is made from materials with vibration dampening properties (such as rubber, polymer composites, or viscoelastic materials). These composite or damped materials absorb vibrational energy through internal friction and hysteresis, converting mechanical vibration into heat, thereby reducing the amplitude of resonant vibrations and preventing harmful vibration transfer
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 dampens vibrations and noise, enhancing mechanical strength and energy efficiency while reducing the risk of resonance, thus improving the compressor's performance and longevity.
Implementation Method 1
By means of the spring provided between the kit group and the lower casing, the mechanical vibrations are prevented from being transferred to the shell
Implementation Method 2
since lower operating speeds overlap with the suspension frequency of the spring, resonance may occur. By means of the brackets, the suspension frequency of the spring is decreased. Thereby, the possibility of resonance is decreased, and the sound and the vibration are dampened
Implementation Method 3
the bracket which is produced at least partially from a material with vibration dampening properties. Thus, a certain amount of vibrations transferred via the spring are dampened on the bracket
Data Source
Figure 1
Figure 2~3
AI summary
The present invention relates to a variable speed compressor (1) comprising a kit group (2), a lower casing (3) provided under the kit group (2) and at least one spring (4) arranged between the lower casing (3) and the kit group (2).