Blood Separator Ring Cap Hardness to Suppress Stick-Slip Noise
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Solution Overview
Problem
Centrifugal separators used in blood component separation devices generate high-pitched noise during the priming process of anticoagulant, causing anxiety for operators and donors due to the mechanical noise confusion.
Innovation Solution
The blood component separation device adjusts the rubber hardness of the ring cap between 60 and 66 to suppress the stick-slip phenomenon at the rotating and sliding interface between the stator and rotor, reducing the pressing force to 500 grams or less, thereby eliminating high-pitched noise generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pressing force at the rotating and sliding portion is increased to enhance sealing performance, then sealing performance is improved, but the stick-slip phenomenon is generated and high-pitched noise is generated
Solution Approach 1:
The invention changes the physical parameter of rubber hardness of the ring cap to between 60 and 66 (preferably 63-66) to reduce the pressing force at the rotating and sliding portion to 500 grams or less. This parameter change allows the sealing performance to be maintained while suppressing the stick-slip phenomenon that causes high-pitched noise during rotation.
2Reliability
If the rubber hardness of the ring cap is increased to enhance sealing performance, then sealing performance is improved, but the pressing force increases and causes stick-slip phenomenon
Solution Approach 1:
The invention optimizes the rubber hardness parameter of the ring cap to a specific range (60-66) that balances sealing performance and pressing force. This parameter optimization ensures adequate sealing while keeping the pressing force at 500 grams or less, preventing the stick-slip phenomenon.
3Object-generated harmful factors
If the pressing force is reduced to suppress stick-slip phenomenon, then high-pitched noise is suppressed, but sealing performance may deteriorate
Solution Approach 1:
The invention changes the rubber hardness parameter to compensate for the reduced pressing force. By optimizing the rubber hardness to 60-66, the sealing performance is maintained even when the pressing force is reduced to 500 grams or less, thereby suppressing high-pitched noise without compromising sealing reliability.
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 solution effectively prevents the generation of high-pitched noise during the priming process by minimizing the stick-slip phenomenon, ensuring a quieter operation and reducing operator and donor anxiety while maintaining adequate sealing performance.
Implementation Method 1
stick-slip phenomenon generated by the rotor with respect to the stator can be suppressed
Implementation Method 2
ring on rotor side and a ring on stator side are in contact with and slide on each other
Implementation Method 3
In order to centrifuge blood by a centrifugal separator
Data Source
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AI summary
For providing a blood separation device with which high-pitched noise is not generated even when a centrifugal separator is rotated before blood is introduced. A blood component separation device (100) includes a centrifugal bowl (19) including a stator (70) provided with an inlet (19a) and an outlet (19b) of blood or blood component and a rotor (75) provided rotatably with respect to the stator (70), a rotating and sliding portion between the stator (70) and the rotor (75) is sealed by pressing with predetermined pressing force, and the predetermined pressing force is 500 grams or less.