Linear Compressor Rear Spring Constraint for Noise Reduction
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Solution Overview
Problem
Conventional linear compressors face issues with complex manufacturing processes, high costs, and noise generation due to the large number of main springs required for maintaining balance, which leads to unnecessary contact, abrasion, and impurities from transverse displacement of rear springs.
Innovation Solution
A linear compressor design featuring a back cover with a support portion to constrain the movement of the rear main spring in a transverse direction, reducing the number of main springs and aligning the rear spring's center with the piston's center, allowing for resonance and improved stiffness matching, thus minimizing unnecessary contact and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a large number of main springs are installed to maintain balance, then the piston movement balance is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines the functions of multiple main springs by introducing a supporter piston that integrates the balance function. Instead of using four separate main springs (two front and two rear), the supporter piston with its support portion consolidates the spring support structure, reducing the total number of springs while maintaining the balance and stability of piston movement.
2Stability of the object's composition
If a large number of main springs are installed to maintain balance, then the piston movement balance is improved, but the manufacturing process complexity increases
Solution Approach 1:
The supporter piston integrates multiple spring support functions into a single component structure. This merging reduces the number of separate parts that need to be manufactured, assembled, and adjusted, thereby simplifying the manufacturing process while maintaining the required balance stability.
3Duration of action of moving object
If the rear main spring is allowed to move freely, then the spring can expand and contract, but transverse displacement causes abrasion and noise
Solution Approach 1:
The back cover is designed with a specific support portion that provides localized constraint to the rear main spring. This local quality modification allows the spring to expand and contract axially while preventing transverse displacement at the critical rear end, thereby eliminating abrasion and noise without restricting the spring's necessary movement.
4Object-generated harmful factors
If the rear main spring is constrained in transverse direction, then abrasion and noise are reduced, but the spring movement is restricted
Solution Approach 1:
The support portion on the back cover provides directional constraint - it restricts transverse movement to prevent abrasion and noise, while maintaining axial freedom of movement for spring expansion and contraction. This localized, directional constraint resolves the contradiction by being selective about which movements are permitted.
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 design prevents unnecessary contact and abrasion of the rear main spring, reduces manufacturing costs, and enhances the compressor's efficiency by aligning the movement direction with the piston's force application, allowing for easier design modifications without altering the overall configuration.
Implementation Method 1
a rear main spring positioned at the opposite side of the piston, one end of which being supported by the supporter piston; and a back cover having a support portion for constraining the other end of the rear main spring from moving in a transverse direction
Implementation Method 2
utilizing a configuration where the stiffness of the rear main spring matches the combined stiffness of two front main springs, allowing for resonance
Implementation Method 3
The linear motor includes a permanent magnet disposed between an inner stator and an outer stator, and the permanent magnet is linearly reciprocated due to a mutual electromagnetic force
Data Source
AI summary
A linear compressor is provided that includes a stationary member including a cylinder that provides a space to compress a refrigerant; a movable member linearly that reciprocates with respect to the stationary member, and includes a piston that compresses the refrigerant inside the cylinder and a supporter piston connected to the piston and having a support portion that extends in a radial direction of the piston; front main springs positioned so as to be symmetrical with respect to centers of the piston and the supporter piston, one end of each of which is supported by a front surface of the support portion of the supporter piston and the other end of each of which is supported by the stationary member; a rear main spring positioned at an opposite side of the piston, one end of which is supported by the supporter piston; and a back cover having a support portion that constrains the other end of the rear main spring from moving in a transverse direction.