Compressor module and electric-motor-driven refrigerant compressor
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Solution Overview
Problem
Existing compressor modules with separation apparatuses experience torsion and axial displacement issues during operation, leading to noise generation and impairment of separation function due to temperature-induced disengagement of interference fits.
Innovation Solution
A compressor module design featuring a positive-locking connection between the separation apparatus and the compressor housing, utilizing a funnel-like outlet portion and radially deployed positive-locking elements to prevent torsion and axial displacement, ensuring secure retention of the separation apparatus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an interference-fit is used to retain the separation apparatus in the compressor housing, then the separation apparatus can be secured in position, but the retention becomes inadequate under temperature variations leading to disengagement
Solution Approach 1:
The retention system is segmented into multiple independent positive-locking elements (at least two) distributed around the circumference of the separation apparatus. This segmentation ensures that if one locking element experiences thermal disengagement, others remain engaged to maintain retention reliability.
Solution Approach 2:
The retention mechanism transitions from a single-dimensional interference-fit to a multi-dimensional positive-locking system using protrusions and corresponding recesses that engage in radial and axial directions, preventing disengagement under thermal expansion/contraction.
2Device complexity
If a press-fit retention method is used for the separation apparatus, then the structure remains simple, but torsion and axial displacement occur during operation
Solution Approach 1:
The retention function is segmented into distinct positive-locking elements and corresponding contours, replacing the monolithic press-fit structure. This maintains relative simplicity while adding discrete locking features that prevent torsion and axial displacement.
Solution Approach 2:
Positive-locking elements act as intermediary mechanical features between the separation apparatus and compressor housing, providing a mediating retention mechanism that prevents relative motion without requiring complex overall structure.
3Ease of operation
If the separation apparatus is retained using only frictional engagement, then assembly is easy, but noise is generated due to vibrations during operation
Solution Approach 1:
The positive-locking elements and contours are pre-configured to engage automatically during assembly, preventing vibrations and noise generation before operation begins. The locking action is built into the assembly process itself.
Solution Approach 2:
The friction-based mechanical retention system is replaced with a positive-locking mechanical system that uses geometric interlocking (protrusions and recesses) instead of friction, eliminating vibration-induced noise while maintaining assembly simplicity.
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 positive-locking connection effectively secures the separation apparatus, preventing torsion and axial displacement, thereby reducing noise and maintaining the separation function's integrity during compressor operation.
Implementation Method 1
the separation apparatus has an in particular hollow-cylindrical separation chamber (separation portion), in which a separator (separation portion) is received. The admixture (fluid) of lubricant and refrigerant which flows into the separation chamber through an inlet opening of the separation apparatus flows around the separator in a helical manner (cyclone-like manner). In this instance, centrifugal forces act on the admixture of refrigerant and lubricant as a separation mechanism.
Data Source
AI summary
A compressor module has a compressor housing with a high-pressure chamber and an outlet for a compressed refrigerant, and a separation device, accommodated in the compressor housing, for separating out a lubricant mixed with the refrigerant. The separation device has a hollow-cylindrical separation portion and a funnel-shaped outlet portion for the refrigerant, which outlet portion protrudes into the hollow-cylindrical separation portion, forming an annular space. The separation device, by use of a portion end of the separation portion, sits inside a receptacle in the compressor housing, which receptacle is connected to a lubricant reservoir. The separation device, by means of the outlet portion, at least partially sits inside the outlet. The separation device is securely held in the compressor housing by an interlocking connection such that it is prevented from twisting and/or axial displacement.