Twin-Shaft Rotary Compressor Lubrication via Splash Circulation
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Solution Overview
Problem
Existing twin-shaft rotary piston machines face challenges in achieving high rotation speeds due to insufficient cooling and lubrication efficiency, particularly at higher bearing circumferential speeds, leading to increased mechanical dissipation losses and complex, expensive forced feed lubrication systems.
Innovation Solution
The implementation of oil circulation between two oil chambers without a separate oil pump or cooler, utilizing diagonally arranged splash elements and connection channels with terminal cross-sections below the axial lines of the shafts to facilitate efficient oil circulation and cooling, allowing oil to flow from one chamber into the other and back, thereby enhancing lubrication and cooling of roller bearings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If forced feed lubrication with separate oil pump and cooler is used, then lubrication and cooling efficiency is improved, but device complexity and cost increase
Solution Approach 1:
The patent merges the functions of oil circulation and cooling into the existing two-oil-chamber structure by arranging connection channels between the chambers. The oil naturally circulates from one chamber to the other and back, eliminating the need for separate oil pumps and coolers while maintaining effective lubrication and cooling of the roller bearings.
Solution Approach 2:
The system uses the rotational movement of the shafts and splash elements to automatically circulate oil between the two chambers. The centrifugal force and splash action during rotation create natural oil flow and cooling without requiring external powered components, allowing the system to serve itself.
2Productivity
If rotation speed is increased, then productivity is improved, but mechanical dissipation losses increase due to insufficient cooling
Solution Approach 1:
The patent establishes continuous oil circulation between the two chambers through strategically arranged connection channels. This continuous flow ensures constant cooling of the roller bearings during high-speed operation, preventing energy losses from overheating and allowing sustained high rotation speeds for improved productivity.
3Reliability
If oil fill level is increased, then lubrication is improved, but viscous losses and power consumption increase
Solution Approach 1:
The patent divides the oil system into two separate chambers connected by channels, allowing oil to be distributed where needed without requiring a high overall fill level. The connection channels positioned below the axial lines enable targeted lubrication delivery to bearing regions while minimizing the total oil volume required, thus reducing viscous losses and power consumption.
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 enables high bearing circumferential speeds while maintaining a simple construction, improving lubrication and cooling efficiency, reducing the need for external coolers, and facilitating easier maintenance by allowing for a single filling and discharge point.
Implementation Method 1
a) splash lubrication... The lubricating oil is distributed to the points of consumption by means of the moving machine parts themselves
Implementation Method 2
Cooling of the oil is effected by means of heat exchange with the large, wetted inner housing surfaces
Implementation Method 3
two rotary pistons supported in a housing via shafts and roller bearings with rolling elements
Data Source
AI summary
The invention provides a twin-shaft, dry-running rotary piston machine (1) comprising two rotary pistons (8) supported in a housing (2) via shafts (4) and roller bearings (6) with rolling elements, said rotary pistons are horizontally arranged and mesh with each other in opposite directions, so as to define a conveying chamber; two oil chambers (10) arranged in said housing (2) at opposite front sides of the conveying chamber in the area of the roller bearings (6) and provided to be at least in part filled with lubricating oil, two splash elements (12), with per oil chamber (10) one splash element (12) being arranged on the shafts (4) in such a manner that every shaft (4) carries a total of only one splash element (12); and at least two connection channels (14) connecting the two oil chambers (10) with each other. The rotary piston machine according to the invention is also characterized in that the terminal cross sections (14′) of said at least two connection channels (14) are arranged at the oil chambers (10) at least in part below the axial lines (4′) of the shafts (4).