CA1051964A - Air-cooled rotary magnetic isolation coupling - Google Patents
Air-cooled rotary magnetic isolation couplingInfo
- Publication number
- CA1051964A CA1051964A CA288,653A CA288653A CA1051964A CA 1051964 A CA1051964 A CA 1051964A CA 288653 A CA288653 A CA 288653A CA 1051964 A CA1051964 A CA 1051964A
- Authority
- CA
- Canada
- Prior art keywords
- shaft
- vessel
- barrier
- gas barrier
- housing
- 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.)
- Expired
Links
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
- H02K49/106—Magnetic couplings consisting of only two coaxial rotary elements, i.e. the driving element and the driven element with a radial 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
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/50—Sealings between relatively-movable members, by means of a sealing without relatively-moving surfaces, e.g. fluid-tight sealings for transmitting motion through a wall
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
- H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
- H02K9/06—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft
Abstract
ABSTRACT OF THE DISCLOSURE
A magnetic drive for coupling mechanical power to the interior of a high pressure vessel is disclosed. The drive includes an output or driven portion including a non-magnetic housing hermetically sealed to a wall of the vessel and contain-ing an output shaft which extends into the vessel. The shaft is mounted for rotation in bearings contained within a cylindrical extension of the housing projecting into the vessel interior.
The opposite end of the shaft carries a plurality of permanent magnet segments coaxial therewith and is located within a high pressure gas barrier of the housing external of the vessel.
Input power is provided by an input shaft connected to a power source, the input shaft carrying a housing which is coaxial to the gas barrier and has permanent magnets therein which will interact with the output shaft magnets upon rotation of the input shaft to cause rotation of the output shaft. Integrally formed in the input housing is a centrifugal blower which will draw air along the gas barrier during rotation of the input shaft to provide cooling therefor. The structure is compact, is able to cool the entire gas barrier and keeps the formation of eddy currents and their inherent losses to a minimum.
A magnetic drive for coupling mechanical power to the interior of a high pressure vessel is disclosed. The drive includes an output or driven portion including a non-magnetic housing hermetically sealed to a wall of the vessel and contain-ing an output shaft which extends into the vessel. The shaft is mounted for rotation in bearings contained within a cylindrical extension of the housing projecting into the vessel interior.
The opposite end of the shaft carries a plurality of permanent magnet segments coaxial therewith and is located within a high pressure gas barrier of the housing external of the vessel.
Input power is provided by an input shaft connected to a power source, the input shaft carrying a housing which is coaxial to the gas barrier and has permanent magnets therein which will interact with the output shaft magnets upon rotation of the input shaft to cause rotation of the output shaft. Integrally formed in the input housing is a centrifugal blower which will draw air along the gas barrier during rotation of the input shaft to provide cooling therefor. The structure is compact, is able to cool the entire gas barrier and keeps the formation of eddy currents and their inherent losses to a minimum.
Description
lOS~964 The present invention relates particularly to a magnetic drive for coupling me~hanlcal power from the exterior to the lnterior of a high pressure vessel.
BACKGROUND OF THE INVE~TION
There are many uses for vessels which may be required to withstand high internal pressures, say up to 5000 p.s.i., whether in the laboratory or in industry. One example is a decompression chamber for deep-sea divers, which chamber requires a power source to operate equipment therein, such as rotary gas pumps for circulating the breathing gas mixture through chemical carbon dioxide scrubbers to remove the carbon dioxide. For safe-ty reasons it is not practical to use electric motors within the chamber and hence an external drive for motors within the chamber is required. Hermetically sealed drives using electric motors wherein the driven shaft pro~ects through an opening in the chamber wall and is held in a pressurized zone have been utilized (see Our Canadian Patent Application Serial No. 226,097 filed May 2, 1975). Other types of external drives have been utilized, for example drives where the input shaft texternal) is magnetically coupled to the output shaft (internal~. Such drives have not been completely satisfactory since it is necessary to use a high pressure gas barrier between the input and output magnets and~
when a metallic barrier to withstant the high pressures is used, etdy currents are set up which can cause substantial heating of the barrier and attendant losses in efficiency of the magnet~c coupling. Additional cooling is therefore required for the 8as bsrrier and ln the past it has been necessary to provide add-on blowers or fans for the ma~netic interf~ce.
- 1 - .
:,.
~ ,.. .
SUMMARY OF THE INV~NTION
The present invention provides a magnetic drive coupling which overcomes most of the problems of the prior art.
An output shaft is mounted within the pressure vessel in a cantilevered manner on small, low-loss bearings and has a portion thereof extending exteriorly of the vessel to carry a plurality of magnets thereon. A gas barrier hermeticall$
sealed to the vessel and formed of a high electrical volume resistivity metal envelops completely the extended portion of the oueput sha~t and the magnets carried thereby. An input shaft connectet to a power source is aligned with the output shaft and carries a cup-like housing having a plurality of drive magnets therein surrounding the gas barrier and aligned with the output magnets whereby rotation of the input shaft will cause rotation of the output shaft through magnetic interaction.
The housing is also integrally provided with a centrifugal blower structure which draws ambient air along the surface of the gas barrier in the gap between the barrier and the drive magnets to provide cooling of the barrier.
Thus the present invention provides definite advantages over known drive systems. It first of all keeps eddy currents and their attendant losses to a minimum by utilizing a particular type of gas barrier. It further keeps the gas barrier cool by providing an integral cooling system which will supply cooling air ~to the barrier whenever e~ drive system is operating. And the ure of a cantilever mounting for the output shàft permits the u~e of samll, low 1089 bearings and enables the entire 8as barrier _~ to experience the coollng alr flow. The present lnvention there-
BACKGROUND OF THE INVE~TION
There are many uses for vessels which may be required to withstand high internal pressures, say up to 5000 p.s.i., whether in the laboratory or in industry. One example is a decompression chamber for deep-sea divers, which chamber requires a power source to operate equipment therein, such as rotary gas pumps for circulating the breathing gas mixture through chemical carbon dioxide scrubbers to remove the carbon dioxide. For safe-ty reasons it is not practical to use electric motors within the chamber and hence an external drive for motors within the chamber is required. Hermetically sealed drives using electric motors wherein the driven shaft pro~ects through an opening in the chamber wall and is held in a pressurized zone have been utilized (see Our Canadian Patent Application Serial No. 226,097 filed May 2, 1975). Other types of external drives have been utilized, for example drives where the input shaft texternal) is magnetically coupled to the output shaft (internal~. Such drives have not been completely satisfactory since it is necessary to use a high pressure gas barrier between the input and output magnets and~
when a metallic barrier to withstant the high pressures is used, etdy currents are set up which can cause substantial heating of the barrier and attendant losses in efficiency of the magnet~c coupling. Additional cooling is therefore required for the 8as bsrrier and ln the past it has been necessary to provide add-on blowers or fans for the ma~netic interf~ce.
- 1 - .
:,.
~ ,.. .
SUMMARY OF THE INV~NTION
The present invention provides a magnetic drive coupling which overcomes most of the problems of the prior art.
An output shaft is mounted within the pressure vessel in a cantilevered manner on small, low-loss bearings and has a portion thereof extending exteriorly of the vessel to carry a plurality of magnets thereon. A gas barrier hermeticall$
sealed to the vessel and formed of a high electrical volume resistivity metal envelops completely the extended portion of the oueput sha~t and the magnets carried thereby. An input shaft connectet to a power source is aligned with the output shaft and carries a cup-like housing having a plurality of drive magnets therein surrounding the gas barrier and aligned with the output magnets whereby rotation of the input shaft will cause rotation of the output shaft through magnetic interaction.
The housing is also integrally provided with a centrifugal blower structure which draws ambient air along the surface of the gas barrier in the gap between the barrier and the drive magnets to provide cooling of the barrier.
Thus the present invention provides definite advantages over known drive systems. It first of all keeps eddy currents and their attendant losses to a minimum by utilizing a particular type of gas barrier. It further keeps the gas barrier cool by providing an integral cooling system which will supply cooling air ~to the barrier whenever e~ drive system is operating. And the ure of a cantilever mounting for the output shàft permits the u~e of samll, low 1089 bearings and enables the entire 8as barrier _~ to experience the coollng alr flow. The present lnvention there-
- 2 -fore exhiblts advantages in cost, safety, efficlency and slze over known drlve ~ystems.
Broadly speaklng the present lnventlon may be deflned 8S a magnetic drlve for couplLng input power to the interlor of a high pressure vessel having an external wall, comprising an output shaft extending through an opening in the wall, means for supporting one end of the shaft within the vessel, a plurality of permanent output magnets on the other end of the shaft exterior to the vessel, a high pressure gas barrier havlng high electrical volume reslstivity, the barrier being hermetically sealed to the vessel wall ant enveloping the other end of the shaft and the output magnets, an input shaft axially aligned with the output shaft, an annular Gup-shaped housing member fixed to the input shaft, surrounding the gas barrier and carrying a plurality of permanent drive ~agnets therein aligned with the out.put magnets snd radially spaced from the barrier)and a centrifugal blower arrangement integral with the housing member and operative to draw air through the space between the drive magnets and the barrier to cool the barrier.
BRIEF DESCRIPT10~ OF THE DRAWINGS
Figure 1 shows an elevational view of the magnetic coupling of the present inventlon;
Figure 2 shows an axial section along the line A-A
of Figure 1; and Figure 3 shows a transverse section along the line B-B of Figure 1.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Flgure 1 illustrates the rotaty magnetic coupling 10 105~64 of the pre~ent i~vention ln position on the wall 12 of a high pressure vessel. A~ 19 commonly known a main flange 14 i8 attached to the wall 12 by a plurality of equally spaced bolt~
16. As seen in Figures 1 and 2 a cyllndrical housing portion 18 extends coaxially from the flange 14, and passes through an opening 20 in wall 12 so as to termina~e within the pressure vessel.
O-ring seal 22 is placed in an annul~r recess 24 in flange 14 so a~ to abut the outer face of wall 12 when the fl~nge is bolted thereto, and a second O-ring seal 26 is positioned in a circum-ferential recess 28 in opening 20 so as to abut the outer per-iphery of the cylindrical portion 18 when it is located in the opening 20. Seals 22 and 26 aid in sealing the interior of the pressure vessel from the exterior therof. Thus the combination of flange 14 and cylindrical portion 18 may be seen to form a bushing.
Cylindrical portion 18 is hol~ow, having an axially directed bore 30 therein. A pair of axially spaced bearings 32 are positioned within bore 30 so as to bearingly support a shaft 34 within the bore 30. Shaft 34 projects from the open end of bore 30 into the interior of the prassure vessel for connection to whatever equipment is to be rotated thereby. Circlips 36, 38 and packing 40 are conventionally located within bore 30 adjacent tho bearing 32 closest the OpQn end of bore 30 to prevent any dirt or debris from fouling the bQarings and to prevent move-ment of the bearings from within bore 30. A sleeve ~ is po~itioned between the bearings 32,32 to ~aintain the bearings in thelr proper positions within the bore 30, relative to the -` shaft 34. In that respect it is noted that shaft 34 is provided .
~o5~g64 wlth an,annular ~houlder 44 and clrcumferential ~eats 46,46 for proper positionin~ of the bearlngs. Shaft 34 should be formed of a non-magnetlc material and depending on the application it should be non-corrosive. Stainles~ steel (e.g. type 316) is very suitable.
Shoulder 44 is formed by a portion 48 of shaft 34 having a larger diameter than the portion mounting the bearings 32,32. The enlarged diameter portion inturn is connected to cup-shaped member 50 which is slightly smaller in diameter than the diameter of bore 30. Portion 50 is provided with a blind bore 52 in which are positioned a plurality of circumferentially spaced rotor magnet segments 54 (preferably of a rare earth type such as samarium cobalt) axially oriented to have one pole ad~acent the end of shaft 34 and the opposite pole ad~acent the transition between portions 48 and 50. A locating member 56 is positioned axially in bore 52 to orient and locate the magnets 54 in postion. Cup member 50 is closed by an end cap 58, made from the same material as shaft 34, to hermetically seal the rotor magnet segments.
Extending outwardly from flange 14 and coaxial with shaft 34 is a cylindrical housing portion 60, the interior of which defines bore 30. Housing portion 60 is closed by the end portion 62 which is located in close ~uxtaposition to the end cap 58. Housing 60,62 acts as a high pressure gas barrier and should be formed fro~ a metal having a high electrical volume resistivity. This allows the formation of eddy currents and their inherent losses to be held to a minimum. Typical~y the ~asta~/or `'~ barrier can be mate from titanium, nichrome, h~sea~o~ or stain-le88 steel depending on the application. Needless to ~ay housing l radcrn~
dap/~`
' ` 1051964 60,62, f~lange 14 and cyllndrlcal portion 18 could be machined as an integral shaft enclosure from a unltary piece of the appropriate metal although ecomonics would probably dictate that it be a separate piece hermetically sealed to the flange 14 or the wall 12.
Drive for the rotor and its shaft 34 is provided by a rotary drive unit 64 having an input shaft 66 connected to a rotary source (not shown) such as an electric or hydraulic motor. An aluminum generally cup-shaped housing 68 having a cylindrical shaft portion 70 is keyed to input shaft 66 for rotation therewith. A set screw 72 is also provided to lock the housing 68 to the shaft 66.
` Housing 68 has two portions of enlarged diameters po~itioned between the shaft portion 70 and flange 14 mounted to vessel wall 12. The first enlarged portion 74 is an annular cylindrical section provided in its interior with a circumferen-tially spaced plurality of permanent magnet segments 76 (rare earth type) axially directed and located so as to be radially outward of magnets 54 such that the magnetic lines of forcè
between magnets 54 and 76 will cause rotation of shaft 34 upon rotation of input shaft 66. As can be seen from Figure 2 there l~ an annular gap 78 between the magnets 76 and the gas barrier 60~
The second enlarged diameter portion is best portrayed in Flgures 2 and 3. As ceen in Figure 2, the ad~acent ends of portion~ 70 and 74 merge into radially outwardly directed circular fl8nges 80 and 82 respectively, the flanges being separated from each other by a gap 84. Located within the gap and affixed to each of the flanges i9 a plurality of circumferentially spaced dap/;
,: : :
~51~6~
ldentical outwardly spirally dlrected vanes 86, each vane having lts lnner end spaced radlally outwardly from the lnner face of the magnets 76 and havlng lts outer end at the perlphery of the flanges 80, 82. As i8 seen most readily in Figure 3, the flanges 80, 82 and the vanes 86 cooperate to form a centrifugal blower.
The operation of the invention has been previously discussed with respect to the magnets 76, it being noted that the magnets 76, 54 couple, magnetically, the input shaft 66 to the output shaft 34. During high speed operation, however, eddy currents, although minimized by the material of barrier 60, still occur within the gas barrier 60, and heat is generated therein.
By providing the centrifugal blower formed by flanges 80, 82 and vanes 86, ambient air can be induced to flow along the barrier 60 through the gap 78 and out through the blower between the fla~ges 80, 82. This flowing air will cool the gas barrier and permit the high speeds that may be required. The centrifugal blower is integral with the structure housing the drive magnets and hence a compact and relatively inexpensive cooling means is provided.
The above description relates to a specific embodiment of the present invention and it is recognized that others skilled in the art to which the invention pertains could modify the structure while maintaining the essence of the invention. The scope of protection to be accorded the present invention should therefore be determined from the appended claims.
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',
Broadly speaklng the present lnventlon may be deflned 8S a magnetic drlve for couplLng input power to the interlor of a high pressure vessel having an external wall, comprising an output shaft extending through an opening in the wall, means for supporting one end of the shaft within the vessel, a plurality of permanent output magnets on the other end of the shaft exterior to the vessel, a high pressure gas barrier havlng high electrical volume reslstivity, the barrier being hermetically sealed to the vessel wall ant enveloping the other end of the shaft and the output magnets, an input shaft axially aligned with the output shaft, an annular Gup-shaped housing member fixed to the input shaft, surrounding the gas barrier and carrying a plurality of permanent drive ~agnets therein aligned with the out.put magnets snd radially spaced from the barrier)and a centrifugal blower arrangement integral with the housing member and operative to draw air through the space between the drive magnets and the barrier to cool the barrier.
BRIEF DESCRIPT10~ OF THE DRAWINGS
Figure 1 shows an elevational view of the magnetic coupling of the present inventlon;
Figure 2 shows an axial section along the line A-A
of Figure 1; and Figure 3 shows a transverse section along the line B-B of Figure 1.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Flgure 1 illustrates the rotaty magnetic coupling 10 105~64 of the pre~ent i~vention ln position on the wall 12 of a high pressure vessel. A~ 19 commonly known a main flange 14 i8 attached to the wall 12 by a plurality of equally spaced bolt~
16. As seen in Figures 1 and 2 a cyllndrical housing portion 18 extends coaxially from the flange 14, and passes through an opening 20 in wall 12 so as to termina~e within the pressure vessel.
O-ring seal 22 is placed in an annul~r recess 24 in flange 14 so a~ to abut the outer face of wall 12 when the fl~nge is bolted thereto, and a second O-ring seal 26 is positioned in a circum-ferential recess 28 in opening 20 so as to abut the outer per-iphery of the cylindrical portion 18 when it is located in the opening 20. Seals 22 and 26 aid in sealing the interior of the pressure vessel from the exterior therof. Thus the combination of flange 14 and cylindrical portion 18 may be seen to form a bushing.
Cylindrical portion 18 is hol~ow, having an axially directed bore 30 therein. A pair of axially spaced bearings 32 are positioned within bore 30 so as to bearingly support a shaft 34 within the bore 30. Shaft 34 projects from the open end of bore 30 into the interior of the prassure vessel for connection to whatever equipment is to be rotated thereby. Circlips 36, 38 and packing 40 are conventionally located within bore 30 adjacent tho bearing 32 closest the OpQn end of bore 30 to prevent any dirt or debris from fouling the bQarings and to prevent move-ment of the bearings from within bore 30. A sleeve ~ is po~itioned between the bearings 32,32 to ~aintain the bearings in thelr proper positions within the bore 30, relative to the -` shaft 34. In that respect it is noted that shaft 34 is provided .
~o5~g64 wlth an,annular ~houlder 44 and clrcumferential ~eats 46,46 for proper positionin~ of the bearlngs. Shaft 34 should be formed of a non-magnetlc material and depending on the application it should be non-corrosive. Stainles~ steel (e.g. type 316) is very suitable.
Shoulder 44 is formed by a portion 48 of shaft 34 having a larger diameter than the portion mounting the bearings 32,32. The enlarged diameter portion inturn is connected to cup-shaped member 50 which is slightly smaller in diameter than the diameter of bore 30. Portion 50 is provided with a blind bore 52 in which are positioned a plurality of circumferentially spaced rotor magnet segments 54 (preferably of a rare earth type such as samarium cobalt) axially oriented to have one pole ad~acent the end of shaft 34 and the opposite pole ad~acent the transition between portions 48 and 50. A locating member 56 is positioned axially in bore 52 to orient and locate the magnets 54 in postion. Cup member 50 is closed by an end cap 58, made from the same material as shaft 34, to hermetically seal the rotor magnet segments.
Extending outwardly from flange 14 and coaxial with shaft 34 is a cylindrical housing portion 60, the interior of which defines bore 30. Housing portion 60 is closed by the end portion 62 which is located in close ~uxtaposition to the end cap 58. Housing 60,62 acts as a high pressure gas barrier and should be formed fro~ a metal having a high electrical volume resistivity. This allows the formation of eddy currents and their inherent losses to be held to a minimum. Typical~y the ~asta~/or `'~ barrier can be mate from titanium, nichrome, h~sea~o~ or stain-le88 steel depending on the application. Needless to ~ay housing l radcrn~
dap/~`
' ` 1051964 60,62, f~lange 14 and cyllndrlcal portion 18 could be machined as an integral shaft enclosure from a unltary piece of the appropriate metal although ecomonics would probably dictate that it be a separate piece hermetically sealed to the flange 14 or the wall 12.
Drive for the rotor and its shaft 34 is provided by a rotary drive unit 64 having an input shaft 66 connected to a rotary source (not shown) such as an electric or hydraulic motor. An aluminum generally cup-shaped housing 68 having a cylindrical shaft portion 70 is keyed to input shaft 66 for rotation therewith. A set screw 72 is also provided to lock the housing 68 to the shaft 66.
` Housing 68 has two portions of enlarged diameters po~itioned between the shaft portion 70 and flange 14 mounted to vessel wall 12. The first enlarged portion 74 is an annular cylindrical section provided in its interior with a circumferen-tially spaced plurality of permanent magnet segments 76 (rare earth type) axially directed and located so as to be radially outward of magnets 54 such that the magnetic lines of forcè
between magnets 54 and 76 will cause rotation of shaft 34 upon rotation of input shaft 66. As can be seen from Figure 2 there l~ an annular gap 78 between the magnets 76 and the gas barrier 60~
The second enlarged diameter portion is best portrayed in Flgures 2 and 3. As ceen in Figure 2, the ad~acent ends of portion~ 70 and 74 merge into radially outwardly directed circular fl8nges 80 and 82 respectively, the flanges being separated from each other by a gap 84. Located within the gap and affixed to each of the flanges i9 a plurality of circumferentially spaced dap/;
,: : :
~51~6~
ldentical outwardly spirally dlrected vanes 86, each vane having lts lnner end spaced radlally outwardly from the lnner face of the magnets 76 and havlng lts outer end at the perlphery of the flanges 80, 82. As i8 seen most readily in Figure 3, the flanges 80, 82 and the vanes 86 cooperate to form a centrifugal blower.
The operation of the invention has been previously discussed with respect to the magnets 76, it being noted that the magnets 76, 54 couple, magnetically, the input shaft 66 to the output shaft 34. During high speed operation, however, eddy currents, although minimized by the material of barrier 60, still occur within the gas barrier 60, and heat is generated therein.
By providing the centrifugal blower formed by flanges 80, 82 and vanes 86, ambient air can be induced to flow along the barrier 60 through the gap 78 and out through the blower between the fla~ges 80, 82. This flowing air will cool the gas barrier and permit the high speeds that may be required. The centrifugal blower is integral with the structure housing the drive magnets and hence a compact and relatively inexpensive cooling means is provided.
The above description relates to a specific embodiment of the present invention and it is recognized that others skilled in the art to which the invention pertains could modify the structure while maintaining the essence of the invention. The scope of protection to be accorded the present invention should therefore be determined from the appended claims.
1 ~n / `~!
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Claims (10)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A magnetic drive for coupling input power to the interior of a high pressure vessel having an external wall, com-prising an output shaft extending through an opening in said wall, means for supporting one end of said shaft within said vessel, a plurality of permanent output magnets on the other end of said shaft exterior to said vessel, a high pressure gas barrier having high electrical volume resistivity, said barrier being hermetically sealed to said vessel wall and enveloping said other end of said shaft and said output magnets, an input shaft axially aligned with said output shaft, an annular cup-shaped housing member fixed to said input shaft, surrounding said gas barrier and carrying a plu-rality of permanent drive magnets therein aligned with said output magnets and radially spaced from said barrier, and a centrifugal blower arrangement integral with said housing member and operative to draw air through the space between said drive magnets and said barrier to cool said barrier.
2. A magnetic coupling according to claim 1 wherein said supporting means comprises a flange portion sealingly connected to said wall about said opening, a cylindrical portion extending through said opening into the interior of said vessel ant con-nected to said flange portion, said cylindrical portion having an axial bore therethrough, and a pair of bearings mounted in said bore for rotatably supporting said one end of said output shaft.
3. A magnetic coupling according to claim 2 wherein said gas barrier is hermetically sealed to said flange portion.
4. A magnetic coupling according to claim 2 wherein said gas barrier is integrally formed with said flange portion.
5. A magnetic coupling according to claim 1 wherein said blower arrangement includes a pair of axially spaced apart circular flanges extending radially outwardly of said housing member, said flange being interconnected by a plurality of circumferentially spaced, radially spirally outwardly extending vanes, the space between said flanges communicating with the space between said drive magnets and said barrier.
6. A magnetic coupling according to claim 1, 3 or 4 wherein said gas barrier is formed of a material chosen from the group including Hastalloy*, titanium, nichrome and stainless steel.
7. A magnetic coupling for coupling rotary power to the interior of a high pressure vessel having an exterior wall with an opening therethrough comprising:
a bushing member, having a flange portion sealingly connected to said wall about said opening and a cylindrical portion extending through said opening into the interior of said vessel, an axial bore in said bushing, a plurality of bearings in said bore, an output shaft mounted in said bearings for rotation in said bore, said shaft having one end extending into said vessel and an other end extending outwardly of said vessel, a plurality of permanent rotor magnet segments mounted about said shaft other * Trademark end and axially aligned therewith, a cup-shaped non-magnetic high pressure gas barrier having high electrical volume resistivity hermetically sealed to said wall and enveloping said other end of said shaft and said rotor magnet segments, an input shaft external to said barrier and axially aligned with said output shaft, a cup-shaped housing fixed to said input shaft and receiving a major portion of said barrier therewithin, a plurality of permanent drive magnet segments mounted to the interior of said housing, spaced radially outwardly of said barrier to form a gap therebetween, and concentric to said rotor magnet segments for magnetic coupling therewith, said housing including a pair of axially spaced apart circular flanges extending outwardly therefrom, said flanges being interconnected by a plurality of circumferentially spaced radially spirally outwardly directed vanes, said flanges and said vanes forming a centrifugal blower operable to draw air along said barrier through said gap to cool said barrier.
a bushing member, having a flange portion sealingly connected to said wall about said opening and a cylindrical portion extending through said opening into the interior of said vessel, an axial bore in said bushing, a plurality of bearings in said bore, an output shaft mounted in said bearings for rotation in said bore, said shaft having one end extending into said vessel and an other end extending outwardly of said vessel, a plurality of permanent rotor magnet segments mounted about said shaft other * Trademark end and axially aligned therewith, a cup-shaped non-magnetic high pressure gas barrier having high electrical volume resistivity hermetically sealed to said wall and enveloping said other end of said shaft and said rotor magnet segments, an input shaft external to said barrier and axially aligned with said output shaft, a cup-shaped housing fixed to said input shaft and receiving a major portion of said barrier therewithin, a plurality of permanent drive magnet segments mounted to the interior of said housing, spaced radially outwardly of said barrier to form a gap therebetween, and concentric to said rotor magnet segments for magnetic coupling therewith, said housing including a pair of axially spaced apart circular flanges extending outwardly therefrom, said flanges being interconnected by a plurality of circumferentially spaced radially spirally outwardly directed vanes, said flanges and said vanes forming a centrifugal blower operable to draw air along said barrier through said gap to cool said barrier.
8. A magnetic coupling according to claim 7 wherein said gas barrier is hermetically sealed to said flange portion.
9. A magnetic coupling according to claim 7 wherein said gas barrier is integrally formed with said flange portion.
10. A magnetic coupling according to claim 7, 8 or 9 wherein said gas barrier is formed of a material chosen from the group including Hastalloy*, titanium, nichrome and stainless steel.
* Trademark
* Trademark
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA288,653A CA1051964A (en) | 1977-10-13 | 1977-10-13 | Air-cooled rotary magnetic isolation coupling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA288,653A CA1051964A (en) | 1977-10-13 | 1977-10-13 | Air-cooled rotary magnetic isolation coupling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1051964A true CA1051964A (en) | 1979-04-03 |
Family
ID=4109757
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA288,653A Expired CA1051964A (en) | 1977-10-13 | 1977-10-13 | Air-cooled rotary magnetic isolation coupling |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1051964A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3136133A1 (en) * | 1981-09-11 | 1983-04-07 | Nova Scotia Research Foundation Corp., Dartmouth, Nova Scotia | Magnetic coupling |
| US4396849A (en) * | 1980-05-02 | 1983-08-02 | Nova Scotia Research Foundation Corporation | Synchronous magnetic drive assembly with laminated barrier |
| FR2780757A1 (en) * | 1998-07-03 | 2000-01-07 | Sanden Corp | ELECTROMAGNETIC CLUTCH WITH IMPROVED HEAT EXHAUST RADIATION, AND COMPRESSOR CONTAINING THE SAME |
-
1977
- 1977-10-13 CA CA288,653A patent/CA1051964A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4396849A (en) * | 1980-05-02 | 1983-08-02 | Nova Scotia Research Foundation Corporation | Synchronous magnetic drive assembly with laminated barrier |
| DE3136133A1 (en) * | 1981-09-11 | 1983-04-07 | Nova Scotia Research Foundation Corp., Dartmouth, Nova Scotia | Magnetic coupling |
| FR2780757A1 (en) * | 1998-07-03 | 2000-01-07 | Sanden Corp | ELECTROMAGNETIC CLUTCH WITH IMPROVED HEAT EXHAUST RADIATION, AND COMPRESSOR CONTAINING THE SAME |
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