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Title:
SHAFT SEALING DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/017250
Kind Code:
A1
Abstract:
Provided is a shaft sealing device capable of maintaining the sealing performance or durability of a magnetic fluid sealing part. The shaft sealing device seals an annular gap formed between a shaft hole of a housing and a rotary shaft inserted into the shaft hole, and is provided with: a cylindrical seal cover 3 provided on the outer circumference of a rotary shaft 102 that is inserted into a shaft hole of a housing 100; a flexible member 4 which connects the seal cover to the housing; an auxiliary sealing part 5 provided on the inside of a device with respect to the axial direction of the seal cover; a magnetic fluid sealing part 6 provided further outside the device than the auxiliary sealing part; and bearings 7 and 8 which support the load of the magnetic fluid sealing part 6, wherein a pressure damping chamber B, which is maintained at a lower pressure than the pressure outside the device, is provided, inside the seal cover 3, between the auxiliary sealing part 5 and the magnetic fluid sealing part 6.

Inventors:
TAKAHASHI Hidekazu (C/O Eagle Industry Co. Ltd, 1-12-15, Shiba-Daimon, Minato-k, Tokyo 87, 〒1058587, JP)
TAKANO Yoshihisa (C/O Eagle Industry Co. Ltd, 1-12-15, Shiba-Daimon, Minato-k, Tokyo 87, 〒1058587, JP)
Application Number:
JP2018/026127
Publication Date:
January 24, 2019
Filing Date:
July 11, 2018
Export Citation:
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Assignee:
EAGLE INDUSTRY CO., LTD. (1-12-15, Shiba-Daimon Minato-k, Tokyo 87, 〒1058587, JP)
International Classes:
F16J15/43; F16C19/06; F16C19/54; F16C33/76; F16C33/82; F16J3/02; F16J15/447
Foreign References:
JPH04117962U1992-10-22
JP2000002339A2000-01-07
JP2000205418A2000-07-25
Attorney, Agent or Firm:
SHIGENOBU Kazuo et al. (19F Garden Court, 4-1 Kioi-cho, Chiyoda-k, Tokyo 78, 〒1028578, JP)
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