GB2230304A - Drive with magnetic coupling - Google Patents

Drive with magnetic coupling Download PDF

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Publication number
GB2230304A
GB2230304A GB8903106A GB8903106A GB2230304A GB 2230304 A GB2230304 A GB 2230304A GB 8903106 A GB8903106 A GB 8903106A GB 8903106 A GB8903106 A GB 8903106A GB 2230304 A GB2230304 A GB 2230304A
Authority
GB
United Kingdom
Prior art keywords
hub
seal
glandless
partition
cylinder
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.)
Withdrawn
Application number
GB8903106A
Other versions
GB8903106D0 (en
Inventor
Philip John Connor
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB8903106A priority Critical patent/GB2230304A/en
Publication of GB8903106D0 publication Critical patent/GB8903106D0/en
Publication of GB2230304A publication Critical patent/GB2230304A/en
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K49/00—Dynamo-electric clutches; Dynamo-electric brakes
    • H02K49/10—Dynamo-electric clutches; Dynamo-electric brakes of the permanent-magnet type
    • H02K49/104—Magnetic couplings consisting of only two coaxial rotary elements, i.e. the driving element and the driven element
    • H02K49/108—Magnetic couplings consisting of only two coaxial rotary elements, i.e. the driving element and the driven element with an axial air gap
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C32/00—Bearings not otherwise provided for
    • F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
    • F16C32/0402—Bearings not otherwise provided for using magnetic or electric supporting means combined with other supporting means, e.g. hybrid bearings with both magnetic and fluid supporting means
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
    • H02K5/128—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas using air-gap sleeves or air-gap discs

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Sealing Of Bearings (AREA)

Abstract

An assembly for the transmission of rotary motion through a sealed partition 3 by means of magnetic forces comprises a hub assembly 1, and a cylinder assembly 2. The hub is retained into a position coaxial with the cylinder and keyed to co-rotate with the cylinder by magnetic elements within the hub and cylinder. During rotation of the hub and cylinder a hydrodynamic bearing on the face of the hub adjacent to the partition causes a running clearance to be maintained between the hub and the stationary partition. <IMAGE>

Description

A GLANDLESS SEAL FOR MECHANICAL COUPLING This invention relates to the transmission of rotary mechanical motion through a sealing bulkhead or plate without glands or mechanical seals.
It is a common engineering requirement to transmit rotary motion through a partition such that fluids are not allowed to pass back through the partition.
According to the present invention there is provided a partition.
On the fluid side of the partition is a hub assembly which has on the face adjacent to the partition a hydrodynamic thrust bearing.
On the other side of the partition is a cylinder assembly. The hub and cylinder assemblies have magnetic elements and circuits such that there is a strong attraction between the two.
The cylinder is constrained such that it can rotate in close proximity to the partition. The hub is therefore held by attractive forces onto the partition. The magnetic elements in the hub and cylinder are so arranged that when the cylinder rotates the hub is compelled to also rotate. Since the hub has a hydrodynamic bearing as it rotates the self generated fluid pressure causes it to maintain a clearance between itself and the partition so that magnetic attractive forces are balanced by the hydrodynamic pressure. The magnetic elements in hub and cylinder are also arranged such that there is a centering force on the hub so that as it co-rotates with the cylinder it maintains a coaxial position with respect to the cylinder.
A specific embodiment of the invention will now be described by way of example.
Figure 1 shows the complete glandless seal assembly of hub 1, cylinder 2 and partition 3.
Figure 2 shows the magnetic pole orientations on the face of the cylinder assembly. The poles are arranged in 2 groups of 4 pairs of opposing polarities.
Figure 3 shows the face of the hub assembly with a spiral groove hydrodynamic bearing.
The partition 3 can be fixed into an aperture in the volume to be sealed. The hub 1 is then sealed within the fluid and the cylinder is external to the fluid filled portions. The hub 1 and cylinder 2 have magnetic poles adjacent to the partition 3 as illustrated. The position and polarity of the poles is as illustrated in figure 2. This has the effect of causing the hub to be constrained to a position in contact with the partition and co-axial with the cylinder. The hub is further magnetically constrained such that it will co-rotate with the cylinder. The cylinder is retained by bearings or other means which are not shown so that the attractive forces exerted by the hub do not cause the cylinder to contact the partition. The cylinder is then driven into rotary motion by the shaft 4. The hub, which is initially in contact with the partition, is also caused to rotate by virtue of the magnetic flux linkage between it and the cylinder. As the hub rotates the spiral groove hydrodynamic bearing generates fluid pressure under the hub which causes it to float with a small running clearance away from the partition.

Claims (6)

1. A glandless seal for mechanical coupling of rotary motion with magnetic torque transmission and magnetic retention and centering of the driven element within the fluid and with hydrodynamic bearings to maintain an operating clearance of said driven element from the sealing partition.
2. A glandless seal as in Claim 1 but with some centering force supplied by the hydrodynamic bearing in addition to or in place of the magnetic centering forces.
3. A glandless seal as in Claim 1 or Claim 2 but with a contact or roller bearing providing centering and clearance in addition to or in place of the hydrodynamic bearing.
4. A glandless seal as in Claim 1 or Claim 2 or Claim 3 where the hub running clearance is maintained by fluid pressure supplied from some source other than that which is self generated during rotation.
5. A glandless seal as claimed in any preceding claim where the hub hydraulic bearing face is convex and the partition distorts under pressure to a convex shape so as to form the correct overall geometry for the efficient functioning of the hydrodynamic bearing.
6. A glandless seal substantially as described herein with reference to Figures 1, 2 and 3.
6. A glandless seal as substantially described herein with reference to Figures 1, 2 and 3.
Amendments to the claims have been filed as follows 1. A glandless seal comprising a partition separating a hub assembly from a cylinder assembly. The partition is provided to seal fluid within the volume containing the hub assembly.
Magnetic elements are provided in the hub and cylinder so that the hub is centred and retained co-axial with the cylinder and such that if the cylinder is caused to rotate so the hub will co-rotate. A hydrodynamic bearing is provided on the face of the hub adjacent to the partition such that if the hub becomes immersed in fluid then rotary motion causes a running clearance to be maintained between the hub and partition.
2. A glandless seal as in Claim 1 but with some centring force provided by the hydrodynamic bearing in addition to or in place of the magnetic centring forces.
3. A glandless seal as in Claim 1 or Claim 2 but with some other bearing element providing centring and clearance in addition to or in place of the hydrodynamic bearing.
4. A glandless seal as in Claim 1 or Claim 2 or Claim 3 but where the hub running clearance is maintained by fluid pressure supplied from some source other than that which is self-generated by the hub during rotation.
5. A glandless seal as claimed in any preceding claim where the hydraulic bearing face is convex and the partition distorts under fluid pressure to a concave shape so as to form the correct overall geometry for the efficient functioning of the hydrodynamic bearing.
GB8903106A 1989-02-11 1989-02-11 Drive with magnetic coupling Withdrawn GB2230304A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8903106A GB2230304A (en) 1989-02-11 1989-02-11 Drive with magnetic coupling

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8903106A GB2230304A (en) 1989-02-11 1989-02-11 Drive with magnetic coupling

Publications (2)

Publication Number Publication Date
GB8903106D0 GB8903106D0 (en) 1989-03-30
GB2230304A true GB2230304A (en) 1990-10-17

Family

ID=10651529

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8903106A Withdrawn GB2230304A (en) 1989-02-11 1989-02-11 Drive with magnetic coupling

Country Status (1)

Country Link
GB (1) GB2230304A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0220628A1 (en) * 1985-10-22 1987-05-06 Ebara Corporation Thrust bearing

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0220628A1 (en) * 1985-10-22 1987-05-06 Ebara Corporation Thrust bearing

Also Published As

Publication number Publication date
GB8903106D0 (en) 1989-03-30

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)