Compressor String Suspension Damping Lowers Natural Frequency
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Solution Overview
Problem
Compressors experience vibration-induced noise and operational limitations due to the natural frequency of the mass-spring system, which restricts the operating speed range and efficiency, and existing solutions with multiple springs complicate assembly and increase components.
Innovation Solution
A vibration damping structure using a flexible string that resists tensile forces, suspending the compressor assembly from both ends, providing damping in multiple directions and reducing natural frequency, thus expanding the operating speed range without the need for multiple springs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a spring damper is used to reduce vibration, then vibration damping is achieved, but the natural frequency of the M-K system overlaps with the low-speed operating range, limiting the compressor's operating speed range
Solution Approach 1:
The patent changes the fundamental parameters of the vibration damping system by replacing the spring element with a viscous damping element. This changes the damping mechanism from elastic (M-K system) to viscous, thereby altering the natural frequency characteristics and allowing the compressor to operate effectively across a broader speed range including low speeds without resonance amplification.
Solution Approach 2:
The patent substitutes the mechanical spring-based M-K vibration system with a viscous damping system. This replacement eliminates the elastic restoring force mechanism that creates the problematic natural frequency, replacing it with velocity-proportional damping that does not produce resonance in the same manner, thus expanding the usable operating range.
2Object-affected harmful factors
If multiple springs are provided to apply elastic force in both gravity and horizontal directions, then comprehensive vibration damping is achieved, but the number of components increases and assembly becomes difficult
Solution Approach 1:
The viscous damping element is designed to provide damping functionality in multiple directions (vertical and horizontal) simultaneously through its fluid-based mechanism. The viscous fluid resists motion in any direction, eliminating the need for separate spring elements oriented in different directions, thus reducing component count while maintaining comprehensive vibration damping.
Solution Approach 2:
The patent merges the functionality of multiple directional springs into a single viscous damping element. The viscous damper integrates both vertical and horizontal damping capabilities in one component, simplifying the overall structure and reducing the number of parts required compared to using multiple springs arranged in different orientations.
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 string-based damping structure effectively reduces vibration transmission, lowers natural frequency, and simplifies assembly by reducing the number of components, thereby enhancing compressor efficiency and operational range.
Implementation Method 1
a string 90 which resists a tensile force generated in a longitudinal direction of the string 90
Data Source
AI summary
A compressor is provided that is configured to suspend a compressor assembly from a string to significantly expand a speed range in which the compressor may be operated. The compressor may include a shell, and a compressor assembly disposed in the shell. The shell and the compressor assembly may be connected to each other by a string. The compressor assembly may be suspended from the shell by the string, and a tensile force may be generated at the string due to self-weight of the compressor assembly. A frame of the compressor assembly may not directly contact the shell.