Scroll compressor and air conditioner having same
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Solution Overview
Problem
In bottom-compression type scroll compressors, oil is mixed with refrigerant and can stagnate, leading to decreased oil viscosity, oil shortages, and increased friction and wear, especially in low-temperature environments.
Innovation Solution
A liquid refrigerant discharge unit is installed to induce stagnated liquid refrigerant towards a refrigerant discharge tube, and a venturi tube is used to enhance the discharge of liquid refrigerant through a venturi effect, thereby preventing stagnation and maintaining oil viscosity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a bottom-compression type scroll compressor is used, then the compressor can achieve high pressure ratio and compact structure, but liquid refrigerant stagnates in the inner space causing oil viscosity decrease and friction loss
Solution Approach 1:
The patent extracts and removes the stagnated liquid refrigerant from the inner space of the compressor casing. By providing a liquid refrigerant discharge passage that extends to the lowermost position and using a refrigerant flow inducing passage to actively draw out accumulated liquid refrigerant, the system prevents oil viscosity degradation caused by liquid refrigerant mixing, thereby maintaining reliable lubrication while preserving the high pressure ratio capability
Solution Approach 2:
The patent introduces a liquid refrigerant discharge passage and refrigerant flow inducing passage as intermediary structures. These passages act as mediators to actively manage the removal of liquid refrigerant from the inner space, preventing direct contact between liquid refrigerant and oil, thus maintaining oil viscosity without compromising the compressor's high pressure ratio performance
2Temperature
If the compressor operates in low-temperature environment, then cooling performance is improved, but liquid refrigerant stagnation increases causing friction and wear
Solution Approach 1:
The patent implements preliminary action by proactively providing a liquid refrigerant discharge passage and refrigerant flow inducing passage before liquid refrigerant accumulation becomes problematic. These structures are pre-configured to automatically draw out and remove liquid refrigerant at the lowermost position of the inner space, preventing friction and wear before they can occur during low-temperature operation
Solution Approach 2:
The patent extracts liquid refrigerant from the inner space using a dedicated discharge passage system. By continuously removing liquid refrigerant that would otherwise accumulate and mix with oil during low-temperature operation, the system prevents friction and wear while maintaining effective cooling performance
3Ease of operation
If oil is mixed with refrigerant to facilitate return, then oil circulation is improved, but oil stagnates at upper side of motor unit and is discharged outside
Solution Approach 1:
The patent segments the inner space into distinct functional zones: a liquid refrigerant discharge passage for removing liquid refrigerant, an oil storage space for collecting returned oil, and a refrigerant discharge passage for discharging compressed refrigerant. This segmentation prevents mixing between liquid refrigerant and oil, allowing oil to be properly stored and circulated while preventing oil loss through discharge
Solution Approach 2:
The patent introduces an oil storage space and flow path guide as intermediary structures. These components act as mediators to separate the paths of liquid refrigerant and oil, enabling oil to be properly collected and circulated without stagnating at the upper side of the motor unit or being discharged outside the compressor
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 solution effectively prevents excessive stagnation of liquid refrigerant, maintains oil viscosity, and reduces friction and wear, enhancing the efficiency and reliability of the air conditioning system.
Implementation Method 1
a venturi tube is used to enhance the discharge of liquid refrigerant through a venturi effect
Data Source
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AI summary
Air conditioner and scroll compressor for an air conditioner including: a refrigerant discharge tube (116) through which refrigerant discharged to an inner space (110a) of a casing (110) is discharged into a refrigeration cycle; a venturi tube (191) disposed adjacent to the refrigerant discharge tube (116) in the inner space of the casing; and a liquid refrigerant discharge tube (192) having a first end connected to the venturi tube (191) and a second end opposite to the first end and communicating with the inner space of the casing at a lower side of the refrigerant discharge tube, whereby liquid refrigerant can be suppressed from excessively stagnating in the inner space of the casing.