Scroll Compressor Oil Passage for Low-Pressure-Ratio Operation
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Solution Overview
Problem
Existing scroll compressors face difficulties in smoothly supplying oil during low-pressure ratio operations due to the need for maintaining appropriate pressure in the intermediate pressure chamber, which restricts operation and reduces efficiency.
Innovation Solution
The scroll compressor design includes an oil supply passage that directly communicates between the casing inner space and the compression chamber, independent of the intermediate pressure chamber, allowing oil to be supplied continuously through non-circular grooves in the orbiting and fixed scrolls, even at low-pressure ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If oil is supplied through the intermediate pressure chamber, then appropriate back pressure is secured, but operation at low-pressure ratio (1.3 or less) is restricted
Solution Approach 1:
The patent divides the oil supply system into two independent pathways: one through the intermediate pressure chamber for high-pressure ratio operations, and another direct pathway from the casing inner space to the compression chamber for low-pressure ratio operations. This segmentation allows the system to adapt to different operating conditions without being restricted to a single oil supply method.
Solution Approach 2:
The patent implements a dynamic oil supply system where the selection of oil supply pathway depends on the operating pressure ratio. At low-pressure ratio (1.3 or less), the direct pathway is activated, while at higher pressure ratios, the intermediate pressure chamber pathway is used. This dynamic adaptation enables the compressor to maintain efficient operation across a wide range of pressure ratios.
2Ease of operation
If the intermediate pressure chamber is used for oil supply, then oil feeding is enabled, but the system complexity increases
Solution Approach 1:
The patent segments the oil supply function into two independent pathways, allowing the direct pathway to be activated when the intermediate pressure chamber pathway is not needed. This reduces system complexity during low-pressure ratio operations by eliminating the need for the intermediate pressure chamber component, while maintaining the ability to use it when required.
Solution Approach 2:
The direct oil supply pathway from the casing inner space to the compression chamber serves as a universal solution that works for both low-pressure ratio operations and as an alternative to the intermediate pressure chamber pathway. This multi-functional design simplifies the overall system by providing a straightforward oil supply method that can be used independently or in conjunction with the intermediate pressure chamber.
3Adaptability or versatility
If direct communication between casing inner space and compression chamber is established, then oil supply at low-pressure ratio is enabled, but the intermediate pressure chamber pressure control is affected
Solution Approach 1:
The patent segments the oil supply system into independent pathways, allowing the direct pathway to operate without affecting the intermediate pressure chamber. The intermediate pressure chamber can maintain its own pressure control through its dedicated oil supply pathway, while the direct pathway handles low-pressure ratio operations independently.
Solution Approach 2:
The patent uses the intermediate pressure chamber as an intermediary component that can be selectively engaged or disengaged from the oil supply system based on operating conditions. When the direct pathway is used for low-pressure ratio operations, the intermediate pressure chamber acts as an optional intermediary that can be bypassed, allowing pressure control to be maintained without interference.
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 design enables smooth oil supply to the compression chamber at low-pressure ratios, enhancing operational efficiency and allowing the compressor to function effectively even when the pressure ratio is 1.3 or less.
Implementation Method 1
a scroll compressor that supplies oil to a compression chamber using a difference between internal pressure of a casing and internal pressure of the compression chamber
Data Source
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AI summary
A scroll compressor is disclosed. The scroll compressor may include an oil supply passage (190) provided independent of an intermediate pressure chamber (Sm) to allow an oil passage (126) of a rotating shaft (125) to communicate with a compression chamber (V), such that some of oil suctioned through the oil passage (126) is guided to the compression chamber (V). As an inner space of a casing (110) communicates directly with the compression chamber (V) without passing through the intermediate pressure chamber (Sm), even in a state where an operating pressure ratio is, for example, 1.3 or less, namely, even if differential pressure between the inner space and the compression chamber (V) is not great, oil stored in the inner space can be smoothly supplied to the compression chamber.