Cryocooler
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Solution Overview
Problem
Cryocoolers operating in strong magnetic fields face reduced motor torque due to magnetic interference, leading to potential motor stalling and decreased refrigeration capacity, and existing magnetic shields increase weight and size while generating undesirable electromagnetic forces.
Innovation Solution
A cryocooler design incorporating a magnetic shield case hermetically connected to the valve housing and motor, along with a reduction mechanism to enhance torque output, allowing for a smaller motor and more efficient magnetic shielding without excessive size or weight increases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a magnetic shield is added to protect the electromagnetic motor from strong magnetic fields, then the motor performance is improved, but the weight and size of the cryocooler increase
Solution Approach 1:
The magnetic shield case is integrated into the existing motor case structure, with the shield forming an inner layer within the outer motor case. This nested configuration provides magnetic shielding functionality while minimizing additional weight and volume compared to a separate shield structure.
Solution Approach 2:
The motor case is designed to serve dual functions: as the structural housing for the electromagnetic motor and as the magnetic shield case. By making the motor case itself magnetic or incorporating magnetic shielding material into the case structure, the need for a completely separate shield is eliminated, reducing overall weight.
2Reliability
If a magnetic shield is added to protect the electromagnetic motor from strong magnetic fields, then the motor performance is improved, but the dimensions of the cryocooler increase
Solution Approach 1:
The magnetic shield case is integrated into the existing motor case structure, with the shield forming an inner layer within the outer motor case. This nested configuration provides magnetic shielding functionality while minimizing additional weight and volume compared to a separate shield structure.
3Power
If a reduction mechanism is added to enhance torque output, then the motor size can be reduced, but the device complexity increases
Solution Approach 1:
A reduction mechanism is introduced as an intermediary component between the electromagnetic motor and the pressure control valve. This mechanism includes a reduction gear that receives rotational input from the motor output shaft and provides reduced-speed, high-torque output to drive the pressure control valve, enabling the use of a smaller motor while maintaining sufficient torque.
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 design effectively shields against strong magnetic fields, maintaining motor performance and refrigeration capacity while reducing the cryocooler's overall size and weight, achieving equivalent or smaller dimensions compared to traditional setups.
Implementation Method 1
a magnetic shield case which encloses the electromagnetic motor outside the motor case
Implementation Method 2
an electromagnetic motor which includes a motor case and a motor output shaft which protrudes from the motor case
Implementation Method 3
a reduction mechanism which connects the motor output shaft to the pressure control valve in a power transmittable manner
Data Source
AI summary
A cryocooler include a pressure control valve, a valve housing which accommodates the pressure control valve, a motor which includes a motor output shaft, a reduction mechanism which connects the motor output shaft to the pressure control valve in a power transmittable manner, and a magnetic shield case which encloses the motor and is hermetically connected to the valve housing. The motor may include a motor case from which the motor output shaft protrudes. The magnetic shield case may enclose the motor outside the motor case.