Effect of surface roughness of mechanical seals for rotary blood pumps under blood sealing

Jun Tomioka, Norifumi Miyanaga

    Research output: Contribution to journalArticle

    1 Citation (Scopus)

    Abstract

    A miniature mechanical seal with the cooling water circulating system have been developed as a solution of the shaft seal problems in rotary blood pumps. The present paper describes the effect of the surface roughness in the sealing gap on the shaft seal problems under blood sealing. The sealing surface roughness of tested three seat rings were designed to be Ra=0.009 urn, Ra=0.088 am and Ra=0.170 urn. The frictional loss torque in the sealing gap and the leakage of the blood and the cooling water were measured in this work. Results show that the maximum frictional loss torque measured in the seat ring of Ra=0.009 jim, and the frictional loss torque decreased as the surface roughness increased. The leakage rate of the cooling water is larger than that of the blood in all seat rings, even though the blood chamber has higher pressure. The sealing characteristics between under blood and water sealing were different. Moreover, the best surface roughness in the torque and the leakage characteristics were also different. Thus, it is important to study under blood sealing in the design of the surface roughness of the mechanical seals for rotary blood pumps.

    Original languageEnglish
    Pages (from-to)2332-2339
    Number of pages8
    JournalNihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C
    Volume76
    Issue number769
    Publication statusPublished - 2010 Sep

    Fingerprint

    Sealing (closing)
    Seals
    Blood
    Surface roughness
    Pumps
    Cooling water
    Torque
    Seats

    Keywords

    • Blood sealing
    • Lubrication
    • Mechanical seal
    • Shaft seal
    • Surface roughness
    • Tribology

    ASJC Scopus subject areas

    • Mechanical Engineering
    • Mechanics of Materials
    • Industrial and Manufacturing Engineering

    Cite this

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    title = "Effect of surface roughness of mechanical seals for rotary blood pumps under blood sealing",
    abstract = "A miniature mechanical seal with the cooling water circulating system have been developed as a solution of the shaft seal problems in rotary blood pumps. The present paper describes the effect of the surface roughness in the sealing gap on the shaft seal problems under blood sealing. The sealing surface roughness of tested three seat rings were designed to be Ra=0.009 urn, Ra=0.088 am and Ra=0.170 urn. The frictional loss torque in the sealing gap and the leakage of the blood and the cooling water were measured in this work. Results show that the maximum frictional loss torque measured in the seat ring of Ra=0.009 jim, and the frictional loss torque decreased as the surface roughness increased. The leakage rate of the cooling water is larger than that of the blood in all seat rings, even though the blood chamber has higher pressure. The sealing characteristics between under blood and water sealing were different. Moreover, the best surface roughness in the torque and the leakage characteristics were also different. Thus, it is important to study under blood sealing in the design of the surface roughness of the mechanical seals for rotary blood pumps.",
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    AU - Miyanaga, Norifumi

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    N2 - A miniature mechanical seal with the cooling water circulating system have been developed as a solution of the shaft seal problems in rotary blood pumps. The present paper describes the effect of the surface roughness in the sealing gap on the shaft seal problems under blood sealing. The sealing surface roughness of tested three seat rings were designed to be Ra=0.009 urn, Ra=0.088 am and Ra=0.170 urn. The frictional loss torque in the sealing gap and the leakage of the blood and the cooling water were measured in this work. Results show that the maximum frictional loss torque measured in the seat ring of Ra=0.009 jim, and the frictional loss torque decreased as the surface roughness increased. The leakage rate of the cooling water is larger than that of the blood in all seat rings, even though the blood chamber has higher pressure. The sealing characteristics between under blood and water sealing were different. Moreover, the best surface roughness in the torque and the leakage characteristics were also different. Thus, it is important to study under blood sealing in the design of the surface roughness of the mechanical seals for rotary blood pumps.

    AB - A miniature mechanical seal with the cooling water circulating system have been developed as a solution of the shaft seal problems in rotary blood pumps. The present paper describes the effect of the surface roughness in the sealing gap on the shaft seal problems under blood sealing. The sealing surface roughness of tested three seat rings were designed to be Ra=0.009 urn, Ra=0.088 am and Ra=0.170 urn. The frictional loss torque in the sealing gap and the leakage of the blood and the cooling water were measured in this work. Results show that the maximum frictional loss torque measured in the seat ring of Ra=0.009 jim, and the frictional loss torque decreased as the surface roughness increased. The leakage rate of the cooling water is larger than that of the blood in all seat rings, even though the blood chamber has higher pressure. The sealing characteristics between under blood and water sealing were different. Moreover, the best surface roughness in the torque and the leakage characteristics were also different. Thus, it is important to study under blood sealing in the design of the surface roughness of the mechanical seals for rotary blood pumps.

    KW - Blood sealing

    KW - Lubrication

    KW - Mechanical seal

    KW - Shaft seal

    KW - Surface roughness

    KW - Tribology

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