Motor Jacket Oil Channels for Compact Compressor Lubrication
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Solution Overview
Problem
Designing a compact, cost-effective, and reliable compressor assembly with an oil-free or oil-less compressor element is challenging due to the complexity of integrating oil lines and components, increased risk of oil leaks, and different filtration requirements compared to oil-injected systems, while maintaining efficient lubrication and cooling.
Innovation Solution
The compressor assembly incorporates a motor housing with axially aligned channels for oil circulation, an integrated oil pump driven by the motor shaft, and a dual circulation loop system with separate filtered and unfiltered paths for lubrication and cooling, allowing for a compact design adaptable to varying lengths and reducing the need for additional components and seals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the motor housing is executed as a jacket with channels for oil circulation, then cooling efficiency is improved, but the device complexity increases
Solution Approach 1:
The motor housing is merged with the oil circulation system by executing it as a jacket with integrated channels. This combines the structural function of the housing with the cooling function, allowing oil to circulate through the motor jacket and cool both the motor and compressor components simultaneously, thereby improving cooling efficiency without adding separate cooling apparatus.
Solution Approach 2:
The motor housing jacket serves multiple functions: it provides structural support for the motor, acts as a cooling channel for the motor windings, and serves as part of the oil circulation system for cooling compressor components. This multi-functionality reduces the need for separate dedicated cooling structures.
2Reliability
If an oil pump is integrated within the motor housing, then the number of oil line connections is reduced, but the device complexity increases
Solution Approach 1:
The oil pump is integrated within the motor housing, merging the oil circulation function into the existing motor structure. This eliminates the need for separate oil pump housing and reduces the number of external oil line connections, thereby reducing leak points and improving reliability.
Solution Approach 2:
The motor shaft directly drives the oil pump, allowing the motor to serve its primary function of driving the compressor while simultaneously powering the oil circulation system. This self-service arrangement eliminates the need for a separate drive mechanism for the oil pump.
3Productivity
If channels are provided in the motor jacket for oil circulation, then oil transport efficiency is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The motor jacket is segmented into multiple channels that guide oil flow through specific paths. This segmentation allows oil to be distributed to different cooling zones efficiently, improving oil transport effectiveness while the channels are formed as integral parts of the casting.
Solution Approach 2:
The channels in the motor jacket utilize hydraulic flow principles to guide oil circulation, allowing efficient heat transfer and cooling without requiring complex mechanical components or high-precision machining.
4Object-affected harmful factors
If the compressor assembly is designed with integrated oil circulation and filtration, then contamination risk is reduced, but the device complexity increases
Solution Approach 1:
The oil filter is integrated into the oil circulation system, merging the filtration function with the existing oil lines and pump. This allows continuous filtration of the lubricating oil without requiring separate filtration systems, reducing contamination risk while utilizing existing structural elements.
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 configuration enhances reliability, reduces oil leaks, optimizes filtration, and lowers production costs by enabling efficient lubrication and cooling without external oil pumps, suitable for both oil-free and oil-injected compressor elements.
Implementation Method 1
the motor shaft (4) of the motor (2) directly or indirectly drives an oil pump (32) of the oil circulation system (33)
Implementation Method 2
oil is circulated through oil lines of the oil circulation system from the oil reservoir to the concerned components to be lubricated or cooled and back to the oil reservoir
Implementation Method 3
an oil cooler (48) for cooling oil circulating through the oil circulation system (33)
Implementation Method 4
an oil filter (50) for filtering oil flowing through one or more lines of the oil circulation system (33)
Implementation Method 5
channels (52) are provided which are connected to oil lines of the oil circulation system (33) for circulating oil through the motor jacket (51)
Data Source
AI summary
A compressor assembly includes a motor which drives one or more compressor rotors having an oil circulation system including an oil reservoir, an oil cooler and an oil filter, an oil-pump for circulating oil from the oil reservoir to components to be cooled and/or lubricated and back to the oil reservoir wherein the motor has a motor jacket with channels extending in axial directions parallel to the axial direction of a motor shaft in which oil of the oil circulation system circulates.