Variable Speed Compressor Oil Pump Integrated Shaft Channels
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current lubricating oil pumping systems in cooling compressors are inadequate for variable speed compressors operating between 700 and 4500 rpm, as existing centrifugal and helical pumps either require larger shaft diameters or suffer from low efficiency due to design limitations, failing to ensure proper lubrication and gas release across the entire speed range.
Innovation Solution
A variable speed cooling compressor with a lubricating oil helical pump system featuring a rotating shaft with integrated channels and radially passing holes, forming a single integrated channel for efficient oil and gas transport, ensuring effective lubrication of radial bearings and cam portions without impacting oil flow rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If centrifugal pump design is used with high repression height, then oil pumping capability is improved, but shaft diameter must be increased to 18mm or greater
Solution Approach 1:
The shaft is divided into multiple functional segments: a centrifugal pump section for high-speed operation and a helical pump section for low-speed operation. This segmentation allows each section to be optimized for its specific speed range, eliminating the need for a large diameter shaft to accommodate both functions simultaneously.
Solution Approach 2:
The pump system transitions from a static design to a dynamic one where the dominant pumping mechanism changes with operating speed. At high speeds, centrifugal force dominates; at low speeds, helical pumping action takes over. This dynamic adaptation allows effective oil pumping across the entire speed range without requiring increased shaft diameter.
2Productivity
If centrifugal pump is used for low speed operation below 2000 rpm, then oil pumping is insufficient, but increasing shaft diameter is not feasible
Solution Approach 1:
The shaft is designed to perform multiple pumping functions within a single component. The upper portion functions as a centrifugal pump for high-speed operation, while the lower portion functions as a helical pump for low-speed operation. This multi-functionality ensures adequate oil pumping across the entire speed range from 700 to 4500 rpm without requiring separate pump systems.
Solution Approach 2:
The pumping mechanism changes based on operating parameters, specifically rotational speed. The design exploits the transition from centrifugal-dominated flow at high speeds to helical-pumping-dominated flow at low speeds, adapting the pumping action to match the operating conditions automatically.
3Reliability
If separate channels for oil pumping and gas release are used, then gas release is improved, but device complexity increases
Solution Approach 1:
The oil pumping and gas release functions are merged into a single integrated channel system. The helical channel serves dual purposes: pumping oil from the reservoir to the compression chamber while simultaneously providing a pathway for gas to escape from the oil stream. This integration eliminates the need for separate gas release channels while maintaining both functions effectively.
Solution Approach 2:
The helical channel is designed as a multi-functional element that performs both oil transport and gas venting operations. By routing both oil and gas through the same helical path, the design simplifies the overall channel structure while ensuring reliable gas release during the pumping process.
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 solution provides consistent and efficient lubrication across the entire range of operating speeds, from 700 to 4500 rpm, by utilizing an integrated channel structure that maintains high lubrication efficiency and gas release capabilities, addressing the limitations of existing systems.
Implementation Method 1
The interface region where it is defined the inner helical channel of the helical pump... The lubricating oil is pumped by centrifugal force throughout the tubular axial channel of the rotating shaft, being transported to the cam inner channel of the rotating shaft
Implementation Method 2
the lubricating oil is pumped by centrifugal force throughout the tubular axial channel of the rotating shaft
Implementation Method 3
the circuit defined by the junction of the inner axial channel and the cam inner channel of the rotary axis is also responsible for the release of coolant gas (which is dissolved in the lubricating oil and is separated from it by the pressure reduction and stirring processes that occur within the oil pump)
Implementation Method 4
cooling compressors, which are usually airtight, provide for the use of lubricating oil to reduce friction and wear between the moving components
Data Source
AI summary
The present invention belongs to the technological field of cooling compressors and, particularly, constructive details of lubricating oil pumps of cooling compressors. Problem to be solved: The current state of the art does not describe any solution of oil pump and construction of rotating shaft capable of achieving the correct lubricating of the moving components that include the compression functional unit of cooling compressor, which operating speed can vary between 700 and 4500 rpm. Solution of the problem: It is disclosed is a variable speed cooling compressor which tubular extension of the oil pump, the inner axial channel of the rotating shaft, the axial channel extension of the rotating shaft and the inner cam channel segment of the rotating axis are all fluidly connected to each other in order to conform a single integrated channel.