Integrated Cooling Medium Supply Device for Superconducting Rotary Machine
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Solution Overview
Problem
Conventional cooling medium supply/discharge devices for superconducting rotary devices require a complex structure and increased axial length due to the need for separate support, which raises manufacturing costs and reduces manufacturing accuracy.
Innovation Solution
A cooling medium supply/discharge device is integrated into the rotary shaft of the superconducting rotary device, using a cylindrical rotary casing and stationary casing with relative rotation via a bearing, and additional cylindrical bodies to form flow passages for the cooling medium, eliminating the need for external support and simplifying the structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate support structure is provided for the cooling medium supply/discharge device, then the device can function properly, but the structure becomes complex and manufacturing cost increases
Solution Approach 1:
The cooling medium supply/discharge device is merged with the rotary shaft structure. The inlet cooling tube and outlet cooling tube are integrated into the rotary shaft, eliminating the need for separate support structures. The stationary tube is fixed to the refrigerating device while the rotary tube rotates with the rotary shaft, and they are coupled together to form an integrated cooling medium supply/discharge system.
2Ease of repair
If the cooling medium supply/discharge device is placed separately from the superconducting rotary device, then the device can be maintained independently, but the axial length of the machine increases
Solution Approach 1:
The inlet cooling tube is placed inside the outlet cooling tube, forming a nested structure. The inlet cooling tube with smaller diameter is positioned within the outlet cooling tube with larger diameter, allowing both cooling medium supply and discharge functions to be achieved within the same axial space, thereby reducing the overall axial length of the machine.
3Reliability
If a seal member is used to prevent leakage at the coupling portion of stationary tube and rotary tube, then cooling medium leakage is prevented, but heat is generated by sliding operation and the seal member life is shortened
Solution Approach 1:
The harmful sliding friction is extracted and replaced by a magnetic fluid seal mechanism. Instead of using a mechanical seal member that slides between the stationary tube and rotary tube, a magnetic fluid seal is employed to prevent leakage without contact, thereby eliminating heat generation from friction and extending component life.
4Loss of substance
If a small gap is formed in the stationary tube and rotary tube to control leakage, then the leak amount is controlled, but the structure becomes more complex
Solution Approach 1:
A magnetic fluid seal acts as an intermediary between the stationary tube and rotary tube to prevent cooling medium leakage. The magnetic fluid creates a sealing barrier that controls leakage without requiring complex mechanical gap structures or additional sealing components, simplifying the overall device structure.
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 reduces the axial length of the machine, simplifies the structure, and maintains high manufacturing accuracy while preventing vibration transmission and temperature increases in the cooling medium.
Implementation Method 1
relative rotation between the stationary casing and the rotary casing via a bearing is allowed to occur
Implementation Method 2
supply a cooling medium (refrigerant) used to cool a superconducting coil to a temperature at which the superconducting coil is retained in a superconductive state
Data Source
AI summary
A cooling medium supply/discharge device includes a cylindrical rotary casing which is rotatable with a rotary shaft of the rotor; a cylindrical stationary casing fixed such that the stationary casing extends inward relative to the rotary casing and coaxially with the rotary casing, the stationary and rotary casings being relatively rotatable; a first stationary cylindrical body which is inserted into the stationary casing such that the first stationary cylindrical body is not rotatable; a first rotary cylindrical body which is inserted into the first stationary cylindrical body with a gap such that the first rotary cylindrical body is rotatable together with the rotary shaft; a second stationary cylindrical body which is inserted into the first stationary cylindrical body such that the second stationary cylindrical body is not rotatable; and a second rotary cylindrical body which is inserted into the first rotary cylindrical body and rotatable together with the rotary shaft.