Scroll Compressor Lubrication via Suction-Driven Oil Supply
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Solution Overview
Problem
Existing scroll compressors face challenges in maintaining an appropriate oil circulation rate at varying compressor rotational speeds and different system operating parameters, leading to issues such as excessive oil accumulation around the discharge valve assembly and reliability problems.
Innovation Solution
A compression mechanism oil supply device that includes an oil supply passage with an outflow opening between the suction fitting and suction window, allowing lubricant to be taken on demand by the low-pressure working fluid, and featuring a counterbore with a larger inner diameter and a plug with a smaller through hole to adjust and optimize oil circulation rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high oil circulation rate is used to ensure adequate lubrication at low compressor rotational speeds, then the lubrication effect is improved, but the lubricating oil accumulates around the discharge valve assembly causing operational instability
Solution Approach 1:
The patent applies dynamics by making the oil supply system adaptive to varying operating conditions. The oil supply passage is positioned to utilize the dynamic suction fluid flow, and the system automatically adjusts oil circulation rates based on compressor rotational speed and system conditions, transitioning from static fixed-rate supply to dynamic demand-based supply.
Solution Approach 2:
The patent changes the parameter of oil supply location from traditional positions near the compression mechanism to a strategic position at the suction fitting. This parameter change allows the system to leverage suction fluid dynamics for oil distribution, enabling automatic adaptation of oil circulation rates to match varying compressor speeds and system conditions.
2Reliability
If the outflow opening of the oil supply passage is positioned near the compression mechanism, then direct lubrication is improved, but oil accumulation around the discharge valve assembly occurs
Solution Approach 1:
The patent extracts the oil supply function from its traditional location near the compression mechanism and relocates it to the suction fitting. This separation allows the oil supply system to leverage suction fluid flow for natural distribution, removing the harmful effect of direct oil accumulation around the discharge valve while maintaining effective lubrication through fluid-mediated transport.
Solution Approach 2:
The patent introduces the suction fluid as an intermediary medium for oil transport. Instead of direct oil supply to the compression mechanism, the system uses the suction fluid flowing through the suction fitting as a carrier to transport and distribute oil throughout the system, preventing direct accumulation at problematic locations while ensuring adequate lubrication.
3Device complexity
If a fixed oil supply system is used, then device complexity is reduced, but the oil circulation rate cannot be adjusted for different compressor speeds and operating parameters
Solution Approach 1:
The patent implements self-service by designing an oil supply system that automatically adapts to varying operating conditions without external control. The suction fitting-based oil supply leverages the natural dynamics of suction fluid flow to self-regulate oil circulation rates, with the system automatically adjusting oil distribution based on compressor speed and system conditions through passive fluid dynamics rather than active control mechanisms.
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 ensures the oil circulation rate remains within a desired range at different speeds and temperatures, preventing excessive accumulation and enhancing the operational stability and reliability of the scroll compressor.
Implementation Method 1
the low-pressure working fluid can meet the lubricant discharged and can carry a part of the lubricant into the compression mechanism
Data Source
AI summary
A scroll compressor is provided, including: a compression mechanism, a driving mechanism, a suction fitting and a lubrication system. The compression mechanism is adapted to compress working fluid and includes a movable scroll component, a fixed scroll component and a suction window, the working fluid flows into the compression mechanism via the suction window. The driving mechanism includes a driving shaft and is adapted to drive the compression mechanism. The working fluid flows into the scroll compressor via the suction fitting and then flow into the compression mechanism. The lubrication system includes a lubricant source and a compression mechanism oil supply device adapted to supply the lubricant to the compression mechanism from the lubricant source. The compression mechanism oil supply device has an oil supply passage and an outflow opening of the oil supply passage is located between an opening of the suction fitting and the suction window.