Sealed Scroll Compressor Helium Oil Injection
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Solution Overview
Problem
Existing sealed scroll compressors for helium face limitations in helium gas flow rate and volumetric efficiency due to low operation pressure ratios, leading to decreased performance and increased internal leakage.
Innovation Solution
A sealed scroll compressor design with a specific oil injection port structure and configuration, including a circular oil injection port with a larger diameter than the orbiting scroll wrap thickness, positioned to facilitate oil injection to the radially outer side of the suction working chamber, optimizing the revolution angle and suction pressure range to enhance gas cooling and reduce internal leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the operation pressure ratio is reduced to extend the operation range, then the compressor can operate under smaller pressure ratios, but the helium gas flow rate decreases and internal leakage increases
Solution Approach 1:
The patent applies local quality by creating different pressure zones within the compression chamber. The oil injection port introduces cooling oil specifically to the radially outer side (suction working chamber) to create a high-pressure zone that prevents internal leakage, while the radially inner side maintains lower pressure for efficient compression. This localized pressure differentiation allows the compressor to maintain high flow rates even at low overall pressure ratios.
Solution Approach 2:
The patent uses cooling oil as an intermediary substance to solve the contradiction. The oil is injected into the suction working chamber to act as a pressure barrier that prevents helium gas from leaking back across the scroll wraps. This intermediary oil layer enables the compressor to maintain sealing and flow rate performance under low pressure ratio conditions where traditional sealing methods fail.
2Adaptability or versatility
If the operation pressure ratio is reduced to extend the operation range, then the compressor can operate under smaller pressure ratios, but volumetric efficiency deteriorates due to increased internal leakage
Solution Approach 1:
The patent creates localized high-pressure zones in the suction working chamber through oil injection. This local pressure enhancement at the radially outer side prevents internal leakage across the scroll wrap interfaces, maintaining volumetric efficiency even when the overall compression pressure ratio is reduced for extended operation range.
Solution Approach 2:
Cooling oil serves as an intermediary sealing medium that is injected into the suction working chamber. The oil forms a pressure barrier that blocks helium gas leakage paths, thereby preserving volumetric efficiency under low pressure ratio operating conditions where conventional sealing mechanisms become ineffective.
3Temperature
If cooling oil is injected to cool the helium gas, then the gas temperature decreases, but the flow rate of injection oil decreases under low pressure ratios leading to insufficient cooling and sealing
Solution Approach 1:
The patent applies preliminary action by injecting cooling oil into the suction working chamber before the compression process begins. The oil is introduced in advance to establish a pressure barrier and cooling effect during the suction phase, ensuring adequate oil flow and cooling even when operating at low pressure ratios where post-compression cooling would be insufficient.
Solution Approach 2:
The cooling oil acts as an intermediary that performs dual functions: cooling the helium gas and preventing internal leakage. By injecting the oil into the suction working chamber at the radially outer side, the system ensures adequate oil flow for both cooling and sealing purposes, even under low pressure ratio conditions where traditional injection methods would fail to maintain sufficient flow rates.
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 design achieves high volumetric efficiency, reduces compression power, and improves energy savings by increasing gas flow rate and extending bearing life, while maintaining reliability and efficiency even at low operation pressure ratios.
Implementation Method 1
the orbiting scroll is engaged with an eccentric mechanism connected to a rotating shaft, and revolves relative to the fixed scroll without rotating on the axis of the orbiting scroll
Implementation Method 2
an oil injection tube for cooling the helium gas is provided so as to penetrate the sealed container and be connected to the oil injection port provided on the fixed side plate
Implementation Method 3
a suction chamber located at the terminal end portions of both the scroll wraps links with the oil injection port, under a certain range of revolution angle, via a suction working chamber formed in a radially outer side
Data Source
AI summary
A suction chamber and the oil injection port are linked, under a certain range of revolution angle, via a suction working chamber formed in the radially outer side by a orbiting scroll outer curve and a fixed scroll inner curve under a certain range of revolution angle. An opening of the oil injection port is provided on a bottom surface between teeth of the fixed scroll so that the suction working chamber formed, in a radially inner side, by a orbiting scroll inner curve and a fixed scroll outer curve and the suction chamber are positioned not to be linked with the oil injection port.