Rotary Compressor with Satellite-Driven Eccentric Piston
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Solution Overview
Problem
Existing rotary vane compressors used in cooling and refrigeration systems are heavy, costly, and prone to refrigerant leakage due to high-pressure requirements, which affects efficiency.
Innovation Solution
A rotary compressor arrangement featuring a cylindrical piston eccentrically arranged with respect to a body, driven by a satellite element that orbits and entrains the piston, allowing direct fluid compression without a high-pressure tank, with inlet and outlet ports integrated into the shaft, and a sealing piston to create a variable compression chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the housing is built with strict tolerances to maintain tightness and keep under high pressure, then the compressor maintains sealing and compression capability, but the compressor becomes heavy and costly
Solution Approach 1:
The invention extracts the high-pressure containment function from the compressor housing and relocates it to the refrigerant circuit components downstream. The housing only needs to withstand atmospheric pressure or low suction pressure, eliminating the need for heavy-walled pressure vessels. The shaft with integrated inlet and outlet ports serves only as a fluid conduit, not as a pressure-containing structure.
Solution Approach 2:
Instead of having the housing contain high pressure and the shaft be a simple conduit, the invention inverts this arrangement: the shaft becomes the primary high-pressure conduit with integrated inlet/outlet ports, while the housing operates at low pressure. This inversion allows the housing to be lightweight while the shaft, being a smaller component, efficiently handles high-pressure fluid transport.
2Reliability
If the housing is built with strict tolerances to maintain tightness and keep under high pressure, then the compressor maintains sealing and compression capability, but the compressor becomes costly
Solution Approach 1:
The invention extracts the high-pressure containment requirement from the housing structure, allowing the housing to be manufactured with standard tolerances from common materials. The high-pressure functionality is transferred to the shaft and downstream refrigerant circuit components, which are already designed to withstand compression pressures. This separation dramatically reduces housing manufacturing costs.
Solution Approach 2:
The shaft is given multiple functions: it serves as the rotational drive shaft, as the compression chamber boundary, and as the high-pressure fluid conduit with integrated inlet and outlet ports. This multi-functionality eliminates the need for separate heavy-walled pressure vessels and complex piping, reducing overall system cost and complexity.
3Loss of energy
If lubricating oil is used to seal clearances and minimize gas leakage, then the compressor efficiency is improved, but the system complexity and cost increase
Solution Approach 1:
The invention employs self-sealing through the geometric relationship between the shaft surface and the housing cavity. The eccentric arrangement creates variable clearance zones that automatically seal during different phases of the compression cycle without requiring external sealing mechanisms or lubricating oil. The system seals itself through its inherent mechanical geometry.
Solution Approach 2:
The invention extracts the sealing function from the lubricating oil and implements it through the mechanical geometry of the eccentric shaft arrangement. By removing the dependency on lubricating oil for sealing purposes, the system becomes simpler with fewer moving parts and reduced maintenance requirements, while still achieving effective leakage prevention.
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 results in a compact, efficient, and cost-effective compressor that achieves higher power and compression ratios with reduced leakage and weight, eliminating the need for a high-pressure tank and allowing for thermal separation of the motor, thereby reducing overall system costs and improving efficiency.
Implementation Method 1
a satellite element arranged at an offset axis Y and orbiting around the axis X, such that the satellite element contacts the external wall of the cylindrical piston under a certain pressure or force such that the orbiting of the satellite element entrains in rotation around the axis X the cylindrical piston over the body
Implementation Method 2
a cylindrical piston eccentrically arranged with respect to the body such that a compression chamber is created between them
Implementation Method 3
the volume is decreased by the eccentric motion of the rotor and the compressed fluid is then discharged
Data Source
Figure 1a~1b
Figure 1c~1d
Figure 2~3
AI summary
Rotary compressor arrangement (100) for compressing a fluid comprising a body (40) centered at an axis (X) of a shaft (20) and a cylindrical piston (10) eccentrically arranged with respect to the body (40) such that a compression chamber (110) is created between them; the arrangement (100) further comprising a satellite element (50) arranged at an offset axis (Y) and orbiting around the axis (X), the satellite element (50) contacting the external wall of the cylindrical piston (10) under a certain pressure or force such that the orbiting of the satellite element (50) entrains in rotation around the axis (X) the cylindrical piston (10) over the body (40); wherein the shaft (20) and the body (40) are solidary and static within the compressor arrangement (100); and wherein the shaft (20) comprises at least one inlet port (130) through which a compressible fluid is introduced into the compression chamber (110) for being compressed and/or one outlet port (140) through which the compressed fluid exits the compressor arrangement (100). Cooling/refrigerating system comprising such a rotary compressor arrangement (100).