Multistage Fluid Compressor Cooling via Self-Service
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Solution Overview
Problem
Existing fluid compressors face challenges in efficiently cooling the motor and air foil bearings due to limitations in their cooling flow path structures, leading to inadequate heat management.
Innovation Solution
A multistage fluid compressor design that optimizes the arrangement of impellers and inlet and outlet flow path structures for a cooling medium, utilizing the fluid intended to be compressed to enhance cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a cooling flow path structure is provided in the fluid compressor, then cooling function is added, but the cooling efficiency is insufficient and the structure becomes more complex
Solution Approach 1:
The compressed fluid serves dual purposes: it is both the working fluid for compression and the cooling medium for the motor and bearings. The fluid that would otherwise be wasted is reused for cooling, eliminating the need for separate cooling systems and achieving multi-functionality with the same fluid
Solution Approach 2:
The system cools itself by using its own compressed fluid as the cooling medium. The fluid circulates through the motor and bearing areas, absorbing heat generated during compression, and is then discharged, creating a self-sustaining cooling cycle without external cooling systems
2Productivity
If the compressor rotates at high speed, then compression performance is improved, but heat generation from motor and bearings increases
Solution Approach 1:
The high-speed rotation that generates excessive heat is countered by using the compressed fluid itself as a cooling medium. The heat generated by high-speed motor and bearing operation is absorbed by the circulating fluid, converting the harmful thermal effect into a manageable thermal exchange process
3Temperature
If separate cooling medium is used, then cooling function is achieved, but device complexity and space requirements increase
Solution Approach 1:
The cooling function is merged with the compression function by using the same fluid for both purposes. The fluid circulation system integrates motor cooling, bearing cooling, and compression operations into a unified system, eliminating separate cooling mediums and reducing overall system complexity
Solution Approach 2:
The compressed fluid performs multiple functions simultaneously: it compresses the working fluid, cools the motor, cools the bearings, and serves as the discharge medium. This multi-functionality eliminates the need for separate cooling systems and reduces the overall number of components required
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 proposed design improves cooling efficiency by effectively utilizing the compressed fluid for cooling, reducing the overall axial length of the compressor, and eliminating the need for a separate cooling medium.
Implementation Method 1
a cooling flow path structure capable of efficiently cooling the components in a fluid compressor
Implementation Method 2
an impeller provided in the main body and configured to pressurize an introduced fluid
Data Source
AI summary
The present invention relates to a multistage fluid compressor including a motor housing having a fluid injection port, a stator coupled to the inside of the motor housing, a rotor configured to penetrate the inside of the stator and having two opposite sides based on an axial direction, the two opposite sides being rotatably coupled to the motor housing, an impeller housing coupled to the motor housing and configured to communicate with the inside of the motor housing, the impeller housing having a fluid discharge port configured to connect the inside and outside thereof, and first and second impellers provided in the impeller housing and coupled to one end of the rotor, in which the compressor may be directly cooled by using a fluid intended to be compressed, and components of the compressor including a thrust bearing, the stator, and the rotor may be efficiently cooled.