Linear Compressor Discharge Cover Segmentation for Pulsation Reduction
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Solution Overview
Problem
The existing linear compressor has a large volume, which occupies excessive space in the machine room of refrigerators, and reducing its size to increase storage space compromises performance due to increased drive frequency, leading to friction and noise issues from pulsating refrigerant flow.
Innovation Solution
The design incorporates a discharge cover with multiple stacked covers and a connection pipe to elongate the discharge passage, optimizing the volume ratio of discharge spaces and reducing pulsation, while maintaining a compact size to enhance storage space and minimize noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of stationary object
If the linear compressor size is reduced to increase storage space, then the machine room volume decreases, but the drive frequency increases causing friction and performance deterioration
Solution Approach 1:
The discharge cover is divided into multiple stacked covers (first cover, second cover, third cover) that create separate discharge spaces. This segmentation allows the refrigerant to flow through multiple discrete chambers, reducing pulsation effects while maintaining a compact overall structure.
Solution Approach 2:
The discharge passage is elongated by stacking covers in the axial direction rather than expanding radially. This dimensional approach allows for a longer flow path and larger total discharge space volume without increasing the radial footprint, thus reducing pulsation while keeping the compressor compact.
2Productivity
If the drive frequency is increased to compensate for reduced compressor size, then the compression performance is maintained, but friction force from oil circulation increases
Solution Approach 1:
The harmful pulsating flow is extracted and isolated into separate discharge spaces within the stacked covers. By separating the flow path into distinct chambers, the pulsation effects are minimized, reducing the friction force on the refrigerant and oil circulation.
3Device complexity
If a single discharge cover is used, then the structure is simple, but the discharge space volume is limited and pulsation increases
Solution Approach 1:
The discharge cover structure is segmented into multiple stacked covers creating separate discharge spaces. This segmentation increases the total discharge space volume and allows the refrigerant to flow through multiple chambers, significantly reducing pulsation effects.
Solution Approach 2:
Multiple discharge spaces are stacked in the axial direction, utilizing the vertical dimension to increase total volume without expanding the radial footprint. This maintains structural compactness while effectively reducing pulsation through extended flow path.
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 configuration reduces pulsation and noise, maintains performance by minimizing friction, and allows for a smaller machine room footprint, thereby increasing storage space within refrigerators.
Implementation Method 1
a spring assembly coupled to the discharge valve
Implementation Method 2
The permanent magnet may linearly reciprocate by an electromagnetic force between the permanent magnet and the inner (or outer) stator
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A linear compressor is provided. The linear compressor may include a discharge cover including a plurality of covers stacked in an axial direction.