JPS5586962A - Magnetic fluid seal - Google Patents

Magnetic fluid seal

Info

Publication number
JPS5586962A
JPS5586962A JP16206178A JP16206178A JPS5586962A JP S5586962 A JPS5586962 A JP S5586962A JP 16206178 A JP16206178 A JP 16206178A JP 16206178 A JP16206178 A JP 16206178A JP S5586962 A JPS5586962 A JP S5586962A
Authority
JP
Japan
Prior art keywords
magnetic flux
density
magnetic
magnetic fluid
detector elements
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP16206178A
Other languages
Japanese (ja)
Inventor
Ko Taketomi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fuji Electric Co Ltd
Original Assignee
Fuji Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fuji Electric Co Ltd filed Critical Fuji Electric Co Ltd
Priority to JP16206178A priority Critical patent/JPS5586962A/en
Publication of JPS5586962A publication Critical patent/JPS5586962A/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/40—Sealings between relatively-moving surfaces by means of fluid
    • F16J15/43—Sealings between relatively-moving surfaces by means of fluid kept in sealing position by magnetic force

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)

Abstract

PURPOSE:To automatically control the feed of magnetic fluid in accordance with the change detected in density of magnetic flux, by burying magnetic detector elements in an annular pole block which comes close to a fine annular projection on which magnetic flux is concentrated. CONSTITUTION:A drop of seal pressure resistance in a shaft seal gap due to the reduction of magnetic fluid 1 is detected by manetic detector elements 7 as a density of magnetic flux. A signal in compliance with the differential value of the detection is sent to a discriminator 8 so as to regain the density of magnetic flux under a normal state of sealing, and a motor 9 is actuated. Then a rack and pinion 6a is pushed downward to feed an adequate amount of magnetic fluid 1 from a supplier 6 through a hole 6c to a shaft seal gap between an annular projection 4 on the external circumference of a rotational shaft 3 and a pole block 2, 2a. As the seal pressure resistance in the shaft seal gap is reset to the normal level through make-up of the magnetic fluid 1, the detector elements 7 detect the normally restored density of magnetic flux and the motor 9 is interrupted.
JP16206178A 1978-12-22 1978-12-22 Magnetic fluid seal Pending JPS5586962A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16206178A JPS5586962A (en) 1978-12-22 1978-12-22 Magnetic fluid seal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16206178A JPS5586962A (en) 1978-12-22 1978-12-22 Magnetic fluid seal

Publications (1)

Publication Number Publication Date
JPS5586962A true JPS5586962A (en) 1980-07-01

Family

ID=15747339

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16206178A Pending JPS5586962A (en) 1978-12-22 1978-12-22 Magnetic fluid seal

Country Status (1)

Country Link
JP (1) JPS5586962A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6273161U (en) * 1985-10-29 1987-05-11
US5474302A (en) * 1992-08-27 1995-12-12 Ferrofluidics Corporation On-site fillable ferrofluidic seal
US5806856A (en) * 1992-08-27 1998-09-15 Ferrofluidics Corporation On-site fillable liquid magnetic seal
JP2013142466A (en) * 2012-01-12 2013-07-22 Rigaku Corp Magnetic fluid seal device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6273161U (en) * 1985-10-29 1987-05-11
US5474302A (en) * 1992-08-27 1995-12-12 Ferrofluidics Corporation On-site fillable ferrofluidic seal
US5806856A (en) * 1992-08-27 1998-09-15 Ferrofluidics Corporation On-site fillable liquid magnetic seal
JP2013142466A (en) * 2012-01-12 2013-07-22 Rigaku Corp Magnetic fluid seal device

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