Linear Compressor Spring Cap Resonator for 800 Hz Noise
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Solution Overview
Problem
Linear compressors face challenges in effectively canceling noise, particularly in the 800 Hz band, despite the use of suction mufflers and discharge covers, leading to increased manufacturing costs and compressor size due to the need for additional silencers.
Innovation Solution
The implementation of a linear compressor design that utilizes a spring cap system within the existing components, acting as a Helmholtz resonator, to attenuate noise without the need for additional silencers, by creating a space portion and passage portion that communicate with the inner space of the shell, effectively canceling noise in various frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a separate silencer is installed inside the shell, then noise cancellation capability is improved, but manufacturing cost increases
Solution Approach 1:
The patent merges the silencer function with the spring cap structure. The spring cap, which already exists to support the spring, is designed with an internal cavity that acts as a resonating chamber. This integration eliminates the need for a separate silencer component, thereby reducing manufacturing cost while maintaining noise cancellation capability through the Helmholtz resonance effect created by the cavity and its opening.
Solution Approach 2:
The spring cap is given multiple functions: it supports the spring mechanically and simultaneously serves as a silencer through its cavity structure. This multi-functionality reduces the total number of components needed in the compressor, lowering manufacturing complexity and cost while achieving the desired noise reduction effect.
2Object-affected harmful factors
If a separate silencer is installed inside the shell, then noise cancellation capability is improved, but compressor size increases
Solution Approach 1:
The silencer function is merged into the spring cap, which is an existing component in the compressor assembly. By utilizing the internal space of the spring cap for noise cancellation purposes, the patent avoids adding a separate silencer that would increase the overall compressor volume. The noise cancellation is achieved within the existing component footprint.
Solution Approach 2:
The resonating cavity is nested within the spring cap structure. The cavity is formed inside the existing spring cap volume, effectively utilizing the internal space of an existing component for the silencer function. This nesting approach allows noise cancellation without increasing the external dimensions of the compressor.
3Object-affected harmful factors
If multiple silencers are installed to offset noise in various bands, then noise cancellation capability is improved, but device complexity increases
Solution Approach 1:
The patent adjusts the parameters of the spring cap cavity (volume, opening area, opening position) to optimize the Helmholtz resonance frequency for noise cancellation. By carefully designing these parameters, a single spring cap can effectively target specific noise frequency bands generated by the compressor operation, eliminating the need for multiple silencers with different tuning parameters.
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 solution reduces noise generation inside the compressor without increasing manufacturing costs or size, effectively canceling noise in specific frequency bands, such as 800 Hz, and reduces the overall noise of the compressor.
Implementation Method 1
The spring cap defines a space portion that is defined inside the spring cap and has a volume separate from the inner space of the shell, and a passage portion that extends through an axial side surface of the spring cap and is configured to provide communication between the space portion and the inner space of the shell
Data Source
AI summary
A linear compressor includes a shell, a motor in the shell, a mover coupled to the motor and configured to perform a reciprocating motion in an axial direction, a cylinder disposed in the shell, a piston coupled to the mover and configured to reciprocate in the cylinder, a spring that supports the piston in the axial direction, and a spring cap inserted into an end portion of the spring. The spring cap defines a space portion that is defined inside the spring cap and has a volume separate from the inner space of the shell, and a passage portion that extends through an axial side surface of the spring cap and is configured to provide communication between the space portion and the inner space of the shell.