CA1146207A
Expired / Lapsed
CA
⏱️ 0.0 years remaining
Slotted air-cooled magnetic isolation coupling
Assignee: Nova Scotia Research Foundation Corp
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Filing: 1981-02-06
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Granted: 1983-05-10
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Expires: 2001-02-06
Abstract
Abstract ABSTRACT An improved cooling system for a magnetic isolation drive coupling is described. The coupling includes a driven magnet assembly at one end of an output shaft and which is contained in a housing hermetically sealed to a pressure vessel in which the output shaft is connectable to appropriate equipment therein. A magnetically permeable gas barrier forms part of the housing, surrounding the driven magnet assembly. A drive magnet assembly is contained in an annular housing surrounding the barrier and is connected to a prime mover so that rotation of the drive assembly effects rotation of the driven assembly through magnetic coupling. A plurality of longitudinal slots in the annular housing permit cooling air to be directed onto the gas barrier to reduce the barrier temperature rise due to eddy current heating therein at high torques and rotational speeds. With such cooling the air gap between the drive assembly and the gas barrier can be decreased to permit such high torques and rotational speeds which would, without the improved cooling feature, create unacceptable temperature rises due to eddy current heating.
Inventors
- 👤 Patrick M. Taiani
Bibliographic Details
Application Number
—
Jurisdiction
CA
Data Source
google_patents
Last Synchronized
2026-10-27 09:57
CPC Classifications
H; H02; H02K; H02K49/00; H02K49/10; H02K49/104; H02K49/106; H02K7/00; H02K7/10; H02K7/11; H02K5/00; H02K5/04; H02K5/12; H02K5/128
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
149 words
In a magnetic drive coupling having an input shaft, a coaxial output shaft, a driven magnet assembly on one end of said output shaft and including a plurality of pairs of driven magnets of opposite polarity arranged circumferentially thereabout, gas barrier means enveloping said output shaft and said driven magnet assembly, and a drive magnet assembly contained in an annular housing circumferentially surrounding said gas barrier means in close proximity thereto, said housing being connected to said input shaft and carrying a plurality of pairs of drive magnets of opposite polarity arranged circum-ferentially thereabout in general alignment with said driven magnet pairs, the improvement comprising: a plurality of longi-tudinally directed slots extending radially through said annu-lar housing with each slot being located between adjacent drive magnet pairs, and means for directing cooling air into said slots and onto said gas barrier means during rotation of said drive magnet assembly.
Claim 2
Dependent Claim
149 words
In a magnetic drive coupling having an input shaft, a coaxial output shaft, a driven magnet assembly on one end of said output shaft and including a plurality of pairs of driven magnets of opposite polarity arranged circumferentially thereabout, gas barrier means enveloping said output shaft and said driven magnet assembly, and a drive magnet assembly contained in an annular housing circumferentially surrounding said gas barrier means in close proximity thereto, said housing being connected to said input shaft and carrying a plurality of pairs of drive magnets of opposite polarity arranged circum-ferentially thereabout in general alignment with said driven magnet pairs, the improvement comprising: a plurality of longi-tudinally directed slots extending radially through said annu-lar housing with each slot being located between adjacent drive magnet pairs, and means for directing cooling air into said slots and onto said gas barrier means during rotation of said drive magnet assembly.
Claim 3
Dependent Claim
64 words
The apparatus according to claim 1 wherein said drive magnet assembly comprises an outer annular housing, an inner annular housing containing said drive magnet pairs, means for securing said inner and outer housings together and hub means of reduced diameter for securing said drive magnet assembly to said input shaft, said slots extending radially through said inner and outer housings along the length thereof.
Claim 4
Dependent Claim
29 words
The apparatus according to claim 2 wherein said outer housing and hub means are integrally formed of mild steel and said inner housing is formed of an aluminum alloy.
Claim 5
Dependent Claim
76 words
The apparatus according to claim 2 wherein said gas barrier means includes a first cylindrical housing portion adapted to be hermetically at one end secured to a high pressure vessel, said first housing portion containing there-in bearing means for bearingly supporting said output shaft, and a second housing portion of high electrical volume resis-tivity material circumferentially hermetically secured to the other end of said first housing portion, said second housing portion enveloping said driven magnet assembly.
Claim 6
Dependent Claim
31 words
The apparatus according to claim 4 wherein said driven magnet assembly comprises an enlarged housing of aluminum alloy affixed to said output shaft, and containing therein said pairs of driven magnets.
Claim 7
Dependent Claim
28 words
The apparatus according to claim 4 or 5 wherein said second housing portion is formed of a material chosen from the group including Hastalloy(trademark),titanium, nichrome and stainless steel.
Claim 8
Dependent Claim
42 words
The apparatus according to claim 1, 2 or 4 wherein said air directing means includes fan means on a fan-cooled motor connected to said input shaft as a prime mover therefor, and shroud means surrounding said motor and said drive magnet assembly.
Claim 9
Dependent Claim
92 words
The apparatus according to claim 1, 2 or 4 wherein said air directing means includes cup-shape shroud means having an annular wall circumferentially containing said annular housing, an apertured end wall through which said input shaft passes, and fan means including a hub affixed to said input shaft and a plurality of radial vanes extending from said hub, so that during rotation of said input shaft cooling air is drawn through said apertured end wall and is directed through said slots, with said shroud means preventing radial escape of said cooling air.
Claim 10
Dependent Claim
66 words
The apparatus according to claim 1, 2 or 4 wherein said air directing means includes, for each of said slots, a longitudinally extending scoop affixed through one portion thereof to said annular housing adjacent the slot, with a second portion thereof extending outwardly and circumferentially of said annular housing so as to direct cooling air radially into the slot during rotation of said drive magnet assembly.
Claim 11
Dependent Claim
116 words
The apparatus of claim 1, 2 or 4 wherein said air direct-ing means includes centrifugal blower means having a shroud por-tion circumferentially containing said annular housing, an annular first wall extending outwardly of said shroud portion, an annular second wall extending outwardly of said annular hous-ing and axially spaced from said first wall, and a plurality of radially directed, axially oriented, circumferentially spaced vane members supported between said first and second walls adjacent the outer periphery thereof, whereby upon rotation of said drive magnet assembly cooling air is drawn into said slots at one end thereof and is exhausted centrifugally by said blower means via the vane members thereof at the opposite end of said slots.
References Cited (Backward Citations)
No citation records indexed.
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