CA1208079A - Centrifugal pump - Google Patents
Centrifugal pumpInfo
- Publication number
- CA1208079A CA1208079A CA000493379A CA493379A CA1208079A CA 1208079 A CA1208079 A CA 1208079A CA 000493379 A CA000493379 A CA 000493379A CA 493379 A CA493379 A CA 493379A CA 1208079 A CA1208079 A CA 1208079A
- Authority
- CA
- Canada
- Prior art keywords
- seal
- housing
- shaft
- pump
- wall
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/60—Mounting; Assembling; Disassembling
- F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
- F04D29/622—Adjusting the clearances between rotary and stationary parts
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A centrifugal pump having a packing seal in which rope packing is compressed between two facing seal walls extending radially from the pump shaft, one wall being on a stationary seal gland and the other wall being on a rotary member attached to the shaft; a centrifugal lubricator mounted on the shaft which has an annular tube with an entrance opening through which lubricant enters and exit openings through which the lubricant is centrifugally distributed; an adjustable feature enabling precise adjustment of the impeller's axial location; a removable seal housing; and a tangential flushing tube in a side wall of the seal housing.
A centrifugal pump having a packing seal in which rope packing is compressed between two facing seal walls extending radially from the pump shaft, one wall being on a stationary seal gland and the other wall being on a rotary member attached to the shaft; a centrifugal lubricator mounted on the shaft which has an annular tube with an entrance opening through which lubricant enters and exit openings through which the lubricant is centrifugally distributed; an adjustable feature enabling precise adjustment of the impeller's axial location; a removable seal housing; and a tangential flushing tube in a side wall of the seal housing.
Description
12~
~, This application is divided from our Canadian application 435,446 filed August 12, 1983.
This invention relates to centrifugal pumps and to im-proved sealing means, and improved seal flushing and cooling means for such pumps.
In typical centrifugal pumps, a completely closed, one piece, seal or packing housing is integrally connected to the pump housing for sealing the drive shaft to which the impeller is con-nected. This frequently requires draining the system and removing the impeller for access to the interior of the seal or packing housing and limits the configuration of the seal or packing housing to that originally supplied. Flushing ports in seal housings are often directed in such a manner as to impose unbalanced loads on the seal.
Summary of the Invention The ;nvention features a centrifugal pump having a pump housing, a bladed impeller in the pump housing, a rotatable shaft extending into the pump housing and on which the impeller is mount-ed, the pump housing having a radially extending wall adjacent the impeller and through which the shaft extends, seal means for sealing the wall through which the shaft extends, and a seal hous-ing for supporting the seal means and enclosing the portion of the shaft adjacent the pump housing, the seal housing being demountably connected to the radially extending wall.
In preferred embodiments, the connection between the seal housing and the wall is sealed by an annular seal; the seal housing \
;IZ~ ;753 has a removable wall portion for permitting access to the seal means and the portion of the shaft within the seal housing; there is a tube for carrying cooling fluid, the tube having entrance and exit ends passing through the removable wall of the seal housing and a portion of the tube intermediate the tube ends arranged with-in the seal housing; and the intermediate tube portion is coiled about the seal means and the shaft.
The seal housing can be easily removed ~or replacement, maintenance or substitution of different housings; the cover of the housing can be removed for easy maintenance or replacement of seals or other parts contained in it and for easy addition of elec-tronic transducers and cooling and flushing coils.
In another aspect, the invention features flushing apparatus in the seal housing, having a tube with an entrance end outside the housing and an exit and extending through a side wall of the housing and oriented to direct fluid passing through the tube into the housing in a direction having a component tangential to the interior of the housing side wall.
In preferred embodiments, the seal is connected to the housing at one end thereof and the tube passes through the side wall at a location adjacent that one end, and the direction is in a plane normal to the axis of the shaft.
The flushing apparatus flushes the entire space within the seal housing without causing unwanted vibration or inefficient operation of the seal.
lZ~ '79 The following i9 a descr~ption by ~ay of example of certain embodiments of the present invention reference being had to the accompanying drawings in which:-Figure 1 is a side elevation view of the pump assembly.
Figure 2 is an enlarged sectional view of the pump assembly ofFigure 1 with the motor and motor adaptor removed, showing one type of seal housing.
Figure 3 is a view, taken along line 3-3 of Figure 2.
Figure 4 is a view, taken along line 4-4 of Figure 2.
Figure 5 is a plan view, partly in section and partly broken away, of the seal hous;ng and pump housing.
Figure 6 is a view, taken along line 6~6 of Figure 5.
Figure 7 (sheet 1 of the Drawings~ is an isometric exploded view of a seal housing with alternate co;ls attached to the cover.
Figure 8 is a sectional view similar to Figure 5 showing an .120~79 alternative scal housing containing a pLcl;ing ~eal.
Figure 'J is a view partially broken away, taken along line 9-9 of ligure S.
Structure and Operation Referring to Figurc l in pump assembly lO pump housing 11 defines an impeller chamber 12 ~showll in Figure 2) in which impeller 14 rotates to pump fluid from pump inlet 16 to pump outlet lS. Impeller l~ is mounted on one end of shaft 20 the other end of whicll is (by means of direct mount motor adaptor 22) coupled to and aligned with the shaft of motor 24. Behind pump housing 11, shaft 20 is encloscd by a removable seal housing 26 which is bolted to the backplate 2S of pump housing 11. Also bolted to pump housing ll is one end of a bearing frame adaptor 32 the other end of which is bolted to bearing housing 34 ~wllich scrves as a shaft support for the end of the shaft opposite the impeller~ to assure the axial alignment of shaft 20, pump housing 11 and bearing housing a4. Adjustable fastening means 36 are positioned behind bearing housing 34 for adjusting the axial position of impeller 14. Rear foot 29 and casing foot 31 support the pump assembly foot 29 extending on each side of the center of gravity of the assembly when disconnectcd from the impeller.
Referring to Fi.gure 2 which sl~ows the pump in greater detail shaft 20 is supported rotatably by a pair of bearings '12, ~4 housed within bearing house 34. The position of re.~r bearing ~2 is fixed axially witll respect to shaft 20 by rccessed shaft surfacc ~6 (adjacent thc forward end of bearing 42) and by wasllcr ~S alld thrcadcd retaillcr nut 50 ~adj~cent the rear~ard end). Bearing ~2 is also held fixed witllin a bearillg cartridge 62 by retailliilg surf~cc 6~ and by retailling ring 66 wllicll is bolted to thc bcaring ~` 31L~C)8~
cartridge. Similarlv, the position of front bearing 44 on shaft 20 is set (on the rear end) by recessed shaft surfacc 52. A spring retaining ring 5 ~ ich seats in groove 21 in shaft 20) ancl retainer 56 together force oil seal 58 and coupling ring G0 agaillst the front end of bearing 44, and assure proper seal compression of seal 5S.
The shaft asseMbly, including shaft 20, bearings 42, 44, bearing cartridge 62, and impeller 1~ hich is scre~ed onto the threaded front encl of shat 20), is free to be moved a~ially, because the cylindrical outer surace of the cartridge housing 62 is free to slide in the cylindrical bearing housing bore 68 in \~hich it is mounted, the cylindrical outer surface of cylindrical bearing 44 is free to slide in the bearing housing bore 70 in ~hich it is mounted, the cylindrical outer surace of oil seal 58 is free to slide in cylindrical bearing frame adaptor bore 72 in ~hich it is mounted, and shaft 20 is free to slide in the stationary element 74 of seal 76. The axial e~cursion of the shaft assembly is limited in one direction by the radially extending ~all 78 of pump housillg 11, ~ihicll is adjacent to the leading edge 80 of impeller 14, and in the other direction by radially e~tending face 82 of bac~plate 28 ~hich is adjacent to the trailing edge 84 of impeller 14.
The a~ial position of the shaft assembly is determined by adjustable fastening means 36 ~hich comprise t~o bolts 100 (e.g.,l/2-20 or 1/2-13) ~hicl pass through clearance holes 102 in bearing cartriclge G2 ancl are firmly screl~ecl into the back of bearing ho-lsing 34, and a referellce nut 104 and a loc~nut lOG scre~ed onto eacll holt 100, ~ith tllc be;lri~ cartridge betl~een thelll, so that they can be tightened clol~n onto the bearill(1 cartridge to adjust ancl fi.~ its a,~ial position.
Refcrring to ~igure S~ eacll refercncc nut has a rirn portion lOS
on l-~hicll marks llO are inscribed at regular angul~r intervals ~e.g., 22.5) and are readable in connection ~Yith rcfcrcncc marks 112 on bearing housing 34.
In operation, the a.~ial position of the impcllcr is adjusted so that the gap between edge 80 and ~Ya11 7S :~ill provide optimum p-~lping efficiency, e.g., a gap of 0.015 inch. This is accompliâllcd bv loosening reference nuts 10~ toward the front of the pump asscml)ly alld tightcning locknuts 106 also toward the front of the pump assembly, until the shaft assembly reaches an axial position at ~hich the impeller leading edge strikes the pump housing ~all 7S. The position of each refercncc nut compared l~ith its associated reXcrcnce mar~ 112 is notcd. rhc loclinuts arc backed off and the reference nuts arc then turned bacli tol~ards the bacli of the pump assembly by a number of marlis 110 ~hich correspond to the desircd impeller gap(as determined by the angular spacing bctl-een the marlis and the pitch of the threads of bolts lO0). ~s the impcllcr blacles l~ear, the shaft assembly can be movcd for~lard a procise distallcc to reposition the impeller by a similar use of refcrencc nuts llO. By recording tlle total amount of such adjustments for ~ear, it is possiblc to determine easily ~hen the impeller should be re~laccd. The adjustable fastening means 36 also yermits backing ofE thc shaft asscmbly to tlle point l~llcrc the rear surface Sl of the impeller reaches tlle pulnp housing l.all S2, and ~hen so backed off an 0-ring scal 11~1 in tl1e back wall o:E the impeller scals off scal housing ~6 from fluid located in tl1e lmpeller challlber l~, so th~tt t~orli call bc pcrtormcd in the seal housing witllout the prcsence of the fluid Ind l~ithout nccd of draillin(1 fluid from impellcr ch;lmber 12.
Referring to Fig-Ires 2 and 4 a centrifugal lubricator ~0 (of metal or plastic) is positionecl in bearing housing 3~ for lubricating bearings 12 l4. Lubricator 40 is fi~ed to shaft 0 by set scre\~ 120.
Lubricator 40 has an annulus 121 ~ith a circular internal tube 122 the inner ~all of wlIich is clefined bv the surface of shaft 20. A tubular passage through the outer I~all of annulus 121 defines entrance opening 124 tangential to the tube. A number of spaced e~it openings 126 (oriented radially from shaft 20) in its side pass through the outer periphery of the annulus. ~lesh screen 12S (e.g. nylon ~ith mesh openings bet~-een 50 and ~00 microns) is arranged around the inner I~all of the tube covering the e.~it openings.
The inner surface of bearing housing 34 is contoured to define an oil reservoir 130 containing oil 132 to a level such that oil can enter entrance opening 1~ during each rotation of lubricator ~10 on shaft 20.
Oil ~ihicll has entered tube 122 is thro~n centrifugally out through e~it openings 126 (after passing througlI screen 12S wlIich removes carbon and par-ticulate contanlinants). Oil seals 5S and 130 (lIoused in the opposite ends of the bearing housiI-g) and oil seal 131 on the outer surface of bearing cartridge 62 prevent leakage of oil from the bearing housing.
Referring to Figures 2 and 5, seal ho-Ising 26 contains a mechanical seal 76 (e.g., a seal sold by ~ - Chesterton Co- Stollell~m ;~lassachusetts under the trade mark SSO) havillg a rotatiIlg elelnent 140 (attached by set scre~
1~12 to shaft 20) ancl a correspolldilIg stationary elellleIlt 74 helcl in place by seal gland 144 bolted by bolts 146 to the seal housilIg. The seal housilIg is demountably connectecI by bolts 117 to the baclipl;Ite 2S. IIIC rotatilIg elelnent and stationary element bear against one alIotller rotat.Ibly at seal surf;Ice l~S.
~, This application is divided from our Canadian application 435,446 filed August 12, 1983.
This invention relates to centrifugal pumps and to im-proved sealing means, and improved seal flushing and cooling means for such pumps.
In typical centrifugal pumps, a completely closed, one piece, seal or packing housing is integrally connected to the pump housing for sealing the drive shaft to which the impeller is con-nected. This frequently requires draining the system and removing the impeller for access to the interior of the seal or packing housing and limits the configuration of the seal or packing housing to that originally supplied. Flushing ports in seal housings are often directed in such a manner as to impose unbalanced loads on the seal.
Summary of the Invention The ;nvention features a centrifugal pump having a pump housing, a bladed impeller in the pump housing, a rotatable shaft extending into the pump housing and on which the impeller is mount-ed, the pump housing having a radially extending wall adjacent the impeller and through which the shaft extends, seal means for sealing the wall through which the shaft extends, and a seal hous-ing for supporting the seal means and enclosing the portion of the shaft adjacent the pump housing, the seal housing being demountably connected to the radially extending wall.
In preferred embodiments, the connection between the seal housing and the wall is sealed by an annular seal; the seal housing \
;IZ~ ;753 has a removable wall portion for permitting access to the seal means and the portion of the shaft within the seal housing; there is a tube for carrying cooling fluid, the tube having entrance and exit ends passing through the removable wall of the seal housing and a portion of the tube intermediate the tube ends arranged with-in the seal housing; and the intermediate tube portion is coiled about the seal means and the shaft.
The seal housing can be easily removed ~or replacement, maintenance or substitution of different housings; the cover of the housing can be removed for easy maintenance or replacement of seals or other parts contained in it and for easy addition of elec-tronic transducers and cooling and flushing coils.
In another aspect, the invention features flushing apparatus in the seal housing, having a tube with an entrance end outside the housing and an exit and extending through a side wall of the housing and oriented to direct fluid passing through the tube into the housing in a direction having a component tangential to the interior of the housing side wall.
In preferred embodiments, the seal is connected to the housing at one end thereof and the tube passes through the side wall at a location adjacent that one end, and the direction is in a plane normal to the axis of the shaft.
The flushing apparatus flushes the entire space within the seal housing without causing unwanted vibration or inefficient operation of the seal.
lZ~ '79 The following i9 a descr~ption by ~ay of example of certain embodiments of the present invention reference being had to the accompanying drawings in which:-Figure 1 is a side elevation view of the pump assembly.
Figure 2 is an enlarged sectional view of the pump assembly ofFigure 1 with the motor and motor adaptor removed, showing one type of seal housing.
Figure 3 is a view, taken along line 3-3 of Figure 2.
Figure 4 is a view, taken along line 4-4 of Figure 2.
Figure 5 is a plan view, partly in section and partly broken away, of the seal hous;ng and pump housing.
Figure 6 is a view, taken along line 6~6 of Figure 5.
Figure 7 (sheet 1 of the Drawings~ is an isometric exploded view of a seal housing with alternate co;ls attached to the cover.
Figure 8 is a sectional view similar to Figure 5 showing an .120~79 alternative scal housing containing a pLcl;ing ~eal.
Figure 'J is a view partially broken away, taken along line 9-9 of ligure S.
Structure and Operation Referring to Figurc l in pump assembly lO pump housing 11 defines an impeller chamber 12 ~showll in Figure 2) in which impeller 14 rotates to pump fluid from pump inlet 16 to pump outlet lS. Impeller l~ is mounted on one end of shaft 20 the other end of whicll is (by means of direct mount motor adaptor 22) coupled to and aligned with the shaft of motor 24. Behind pump housing 11, shaft 20 is encloscd by a removable seal housing 26 which is bolted to the backplate 2S of pump housing 11. Also bolted to pump housing ll is one end of a bearing frame adaptor 32 the other end of which is bolted to bearing housing 34 ~wllich scrves as a shaft support for the end of the shaft opposite the impeller~ to assure the axial alignment of shaft 20, pump housing 11 and bearing housing a4. Adjustable fastening means 36 are positioned behind bearing housing 34 for adjusting the axial position of impeller 14. Rear foot 29 and casing foot 31 support the pump assembly foot 29 extending on each side of the center of gravity of the assembly when disconnectcd from the impeller.
Referring to Fi.gure 2 which sl~ows the pump in greater detail shaft 20 is supported rotatably by a pair of bearings '12, ~4 housed within bearing house 34. The position of re.~r bearing ~2 is fixed axially witll respect to shaft 20 by rccessed shaft surfacc ~6 (adjacent thc forward end of bearing 42) and by wasllcr ~S alld thrcadcd retaillcr nut 50 ~adj~cent the rear~ard end). Bearing ~2 is also held fixed witllin a bearillg cartridge 62 by retailliilg surf~cc 6~ and by retailling ring 66 wllicll is bolted to thc bcaring ~` 31L~C)8~
cartridge. Similarlv, the position of front bearing 44 on shaft 20 is set (on the rear end) by recessed shaft surfacc 52. A spring retaining ring 5 ~ ich seats in groove 21 in shaft 20) ancl retainer 56 together force oil seal 58 and coupling ring G0 agaillst the front end of bearing 44, and assure proper seal compression of seal 5S.
The shaft asseMbly, including shaft 20, bearings 42, 44, bearing cartridge 62, and impeller 1~ hich is scre~ed onto the threaded front encl of shat 20), is free to be moved a~ially, because the cylindrical outer surace of the cartridge housing 62 is free to slide in the cylindrical bearing housing bore 68 in \~hich it is mounted, the cylindrical outer surface of cylindrical bearing 44 is free to slide in the bearing housing bore 70 in ~hich it is mounted, the cylindrical outer surace of oil seal 58 is free to slide in cylindrical bearing frame adaptor bore 72 in ~hich it is mounted, and shaft 20 is free to slide in the stationary element 74 of seal 76. The axial e~cursion of the shaft assembly is limited in one direction by the radially extending ~all 78 of pump housillg 11, ~ihicll is adjacent to the leading edge 80 of impeller 14, and in the other direction by radially e~tending face 82 of bac~plate 28 ~hich is adjacent to the trailing edge 84 of impeller 14.
The a~ial position of the shaft assembly is determined by adjustable fastening means 36 ~hich comprise t~o bolts 100 (e.g.,l/2-20 or 1/2-13) ~hicl pass through clearance holes 102 in bearing cartriclge G2 ancl are firmly screl~ecl into the back of bearing ho-lsing 34, and a referellce nut 104 and a loc~nut lOG scre~ed onto eacll holt 100, ~ith tllc be;lri~ cartridge betl~een thelll, so that they can be tightened clol~n onto the bearill(1 cartridge to adjust ancl fi.~ its a,~ial position.
Refcrring to ~igure S~ eacll refercncc nut has a rirn portion lOS
on l-~hicll marks llO are inscribed at regular angul~r intervals ~e.g., 22.5) and are readable in connection ~Yith rcfcrcncc marks 112 on bearing housing 34.
In operation, the a.~ial position of the impcllcr is adjusted so that the gap between edge 80 and ~Ya11 7S :~ill provide optimum p-~lping efficiency, e.g., a gap of 0.015 inch. This is accompliâllcd bv loosening reference nuts 10~ toward the front of the pump asscml)ly alld tightcning locknuts 106 also toward the front of the pump assembly, until the shaft assembly reaches an axial position at ~hich the impeller leading edge strikes the pump housing ~all 7S. The position of each refercncc nut compared l~ith its associated reXcrcnce mar~ 112 is notcd. rhc loclinuts arc backed off and the reference nuts arc then turned bacli tol~ards the bacli of the pump assembly by a number of marlis 110 ~hich correspond to the desircd impeller gap(as determined by the angular spacing bctl-een the marlis and the pitch of the threads of bolts lO0). ~s the impcllcr blacles l~ear, the shaft assembly can be movcd for~lard a procise distallcc to reposition the impeller by a similar use of refcrencc nuts llO. By recording tlle total amount of such adjustments for ~ear, it is possiblc to determine easily ~hen the impeller should be re~laccd. The adjustable fastening means 36 also yermits backing ofE thc shaft asscmbly to tlle point l~llcrc the rear surface Sl of the impeller reaches tlle pulnp housing l.all S2, and ~hen so backed off an 0-ring scal 11~1 in tl1e back wall o:E the impeller scals off scal housing ~6 from fluid located in tl1e lmpeller challlber l~, so th~tt t~orli call bc pcrtormcd in the seal housing witllout the prcsence of the fluid Ind l~ithout nccd of draillin(1 fluid from impellcr ch;lmber 12.
Referring to Fig-Ires 2 and 4 a centrifugal lubricator ~0 (of metal or plastic) is positionecl in bearing housing 3~ for lubricating bearings 12 l4. Lubricator 40 is fi~ed to shaft 0 by set scre\~ 120.
Lubricator 40 has an annulus 121 ~ith a circular internal tube 122 the inner ~all of wlIich is clefined bv the surface of shaft 20. A tubular passage through the outer I~all of annulus 121 defines entrance opening 124 tangential to the tube. A number of spaced e~it openings 126 (oriented radially from shaft 20) in its side pass through the outer periphery of the annulus. ~lesh screen 12S (e.g. nylon ~ith mesh openings bet~-een 50 and ~00 microns) is arranged around the inner I~all of the tube covering the e.~it openings.
The inner surface of bearing housing 34 is contoured to define an oil reservoir 130 containing oil 132 to a level such that oil can enter entrance opening 1~ during each rotation of lubricator ~10 on shaft 20.
Oil ~ihicll has entered tube 122 is thro~n centrifugally out through e~it openings 126 (after passing througlI screen 12S wlIich removes carbon and par-ticulate contanlinants). Oil seals 5S and 130 (lIoused in the opposite ends of the bearing housiI-g) and oil seal 131 on the outer surface of bearing cartridge 62 prevent leakage of oil from the bearing housing.
Referring to Figures 2 and 5, seal ho-Ising 26 contains a mechanical seal 76 (e.g., a seal sold by ~ - Chesterton Co- Stollell~m ;~lassachusetts under the trade mark SSO) havillg a rotatiIlg elelnent 140 (attached by set scre~
1~12 to shaft 20) ancl a correspolldilIg stationary elellleIlt 74 helcl in place by seal gland 144 bolted by bolts 146 to the seal housilIg. The seal housilIg is demountably connectecI by bolts 117 to the baclipl;Ite 2S. IIIC rotatilIg elelnent and stationary element bear against one alIotller rotat.Ibly at seal surf;Ice l~S.
2~8~79 Seal 7G prevents lea~age to the outsicle of the pump of any fluid ~hich (ins-teacl of being pumpcd into pUIllp outlet 18) follo~s a fluid path over and behind impeller 1~ along cavity 150 on the back of the impeller and into the seal housing. Lea~age o such fluid from the seal housing is also prevented by static (e.g. 0-ring) seal 152 (bet~een cover 30 and seal housing 26), seal 15-~ (bet~een the seal gland and the stationary element of the seal)l seal 15fi (betl~een the seal housing and tlle backplate of the pump housing) and seal 15S (bet~een the impeller and the shaft). Cover 30 permits access to seal 76 and shaft 20 ~ithin seal housing 26 for repair impeller 11 being backed to faca S2 before cover 30 is opened to seal chamber 12 from seal housing 26. Seal housillg 26 may also contain a cooling coil comprising a coil of tubillg 170 (e.g. 1/~" or 3/S" in diLneter) centered on the axis of the shaft and positioned about seal 76 (there being a larger than usual space of about 1" betl~een the outer surface of shaft 20 and the inner surface of seal housing 26 ~-~hicll can also accommodate electronlc pressure and temperature tra]lsducers). Tlle encls of tubing 170 pass througl and are held by cover 30 alld tlle ends form entrallce and exit openings 172 174, (~igure 6) outside cover 30. Cooling fluid can be pumpt7d througll the cooling coil to cool t11e seal.
Referring to ~:igure 7 alternatively a flushing coil 176 (similar in size and configuration to the cooling coil) can be attached to cover 30. The flushing coil h~s a nulllber of holes 17S througll ~ihicll fluslling fluid (pumped into the fluslling coil) is sl)ra~ed inte the seal ho-lsing to flush it during pUIllp operation.
Ilusllillg of thc seal hol1sill~ call altern;ltcly ~e accol1lplisllcd througll fluslling apparatus comprisillà a flusllillg tul)c lS0 (ligures 5 6 alld 7) .
~L208~7~
,..~
having an entrance end lS2 outside of the scal housing and an exit end lS~l extellding tllrougll a side ~all of tlle seal llousing and oriented to direct fluslling fluid into the seal housing in a direction having a component tan-gential to the interior of the side ~all of the housing and in a plane normal to tlle shaft axis. The flush tube cnters the seal housing at the rear end of the housing ne~t to the seal gland ~jhich assures that the entire seal housing 1~ill be thorougllly flushed. The tangential orientation enables the fluid to ollol~ the natural curvat-lre of the inside ~all, and preventsflushing fluid from striking the seal directly l~hich reduces vibration and wear and assures efficient seal operation ~hile flushing.
Because of its demountable connection seal housing 26 can be easily replaced \~ith housings of any other desired configuration For example referring to ~igures 8, 9, seal housing 26 may be replaced by c'iemount~ble pac~ing seal housing 200 ~bolted onto bac~plate 2S) which has a stepped interior surface 202 and is closed at its bac',i end by a seal gland 20~ hich is adjustably bolted on by bolts 206. Gland 20~l has a central clearance hole 205 (through ~hich shaft 20 passes) and a radially extending sealing ~all 20S facing to~ards the impeller. A cylindrical rotary member 209 (fixed on shaft 20) has ~a corresponding radi~lly extending sealing ~.~all 210 ~hich has an inner flange 212 close to the shaft and an outer flange 21~t spaced apart from thc shaft so that sealing l~all 210 ancl flanges 212 21-'t form a recess in ~hicll rope pac~ing 216 (e.g. ,/S" or 5/lG" by 22" long) can be spirally l.~rapped. Tlle radial spacing of the t~o ^lallges is at loast t~ice the pacliillg thic~ness. Tlle axial extellt of tlle flallgc?s is less than the pac',iing thiclilless so th;lt as gland 20l is tigll~ellec', do~n ~ISillg bolts 20G tlle pac'~ing is cempressed a.~ially bet~eell tlle sealing ~alls 20S 210. rac~ing _16 _ g _ ~L2~)8~7~
no~here touches sllaft 20 and so causes no wear of the shaft. Packing 216 is helcl fi~ed on rotary member 209 so the sealing surface is betl~een ~all 20S
and packing 216. Alternatively, the flanges can be part of the seal gland the packing can be held fi~ed in the sealing gland and the sealing surface can be defined between sealing wall 210 and the packing. The space within the seal housing is sealed against leakage by static 0-ring seals 218 (~etween seal gland 20~ and seal housing 200) 220 ~between tlle front outer wall of seal housing 200 and backplate 2S) and 222 (between the rear end surface of the impeller and the rear radially inwardly e~tending surface 226 of rotary member 209). Rotary member 209 e~tencls along shaft 20 from seal gland 20-~ toward impeller 1~ ancl is provicled at its end adjacent backplate 28 with a helically threacled outwardly facing labyrinth seal 230 closely spaced to, e.g., 0.005 inch away from facing inner surface 232 of the seal housing. The helical labyrinth seal 230 hydroclynamically pumps fluid outwardly from the seal housing upon rotation of the shaft, reducing fluid pressure witllin the seal housing.
Referring to l:igures 2, 3 for locking shaft 20 against rotation during repair work, removable shaft lock 240 (shown in broken lines) may be employed wllicll has a central hole wllicll fits over shaft 20 the llole having a key 2~2 which mates with a keyway 2~ provided in shaft 20. The outer periphery of the shaft lock has a pair of holes 2~6 correspon~ing to threacled holes on the back face of the bearing cartriclge for bolting on the shaft lock to prevent rotation of the shaft assembly.
Other embodimellts are witllill thc followillg claims.
Referring to ~:igure 7 alternatively a flushing coil 176 (similar in size and configuration to the cooling coil) can be attached to cover 30. The flushing coil h~s a nulllber of holes 17S througll ~ihicll fluslling fluid (pumped into the fluslling coil) is sl)ra~ed inte the seal ho-lsing to flush it during pUIllp operation.
Ilusllillg of thc seal hol1sill~ call altern;ltcly ~e accol1lplisllcd througll fluslling apparatus comprisillà a flusllillg tul)c lS0 (ligures 5 6 alld 7) .
~L208~7~
,..~
having an entrance end lS2 outside of the scal housing and an exit end lS~l extellding tllrougll a side ~all of tlle seal llousing and oriented to direct fluslling fluid into the seal housing in a direction having a component tan-gential to the interior of the side ~all of the housing and in a plane normal to tlle shaft axis. The flush tube cnters the seal housing at the rear end of the housing ne~t to the seal gland ~jhich assures that the entire seal housing 1~ill be thorougllly flushed. The tangential orientation enables the fluid to ollol~ the natural curvat-lre of the inside ~all, and preventsflushing fluid from striking the seal directly l~hich reduces vibration and wear and assures efficient seal operation ~hile flushing.
Because of its demountable connection seal housing 26 can be easily replaced \~ith housings of any other desired configuration For example referring to ~igures 8, 9, seal housing 26 may be replaced by c'iemount~ble pac~ing seal housing 200 ~bolted onto bac~plate 2S) which has a stepped interior surface 202 and is closed at its bac',i end by a seal gland 20~ hich is adjustably bolted on by bolts 206. Gland 20~l has a central clearance hole 205 (through ~hich shaft 20 passes) and a radially extending sealing ~all 20S facing to~ards the impeller. A cylindrical rotary member 209 (fixed on shaft 20) has ~a corresponding radi~lly extending sealing ~.~all 210 ~hich has an inner flange 212 close to the shaft and an outer flange 21~t spaced apart from thc shaft so that sealing l~all 210 ancl flanges 212 21-'t form a recess in ~hicll rope pac~ing 216 (e.g. ,/S" or 5/lG" by 22" long) can be spirally l.~rapped. Tlle radial spacing of the t~o ^lallges is at loast t~ice the pacliillg thic~ness. Tlle axial extellt of tlle flallgc?s is less than the pac',iing thiclilless so th;lt as gland 20l is tigll~ellec', do~n ~ISillg bolts 20G tlle pac'~ing is cempressed a.~ially bet~eell tlle sealing ~alls 20S 210. rac~ing _16 _ g _ ~L2~)8~7~
no~here touches sllaft 20 and so causes no wear of the shaft. Packing 216 is helcl fi~ed on rotary member 209 so the sealing surface is betl~een ~all 20S
and packing 216. Alternatively, the flanges can be part of the seal gland the packing can be held fi~ed in the sealing gland and the sealing surface can be defined between sealing wall 210 and the packing. The space within the seal housing is sealed against leakage by static 0-ring seals 218 (~etween seal gland 20~ and seal housing 200) 220 ~between tlle front outer wall of seal housing 200 and backplate 2S) and 222 (between the rear end surface of the impeller and the rear radially inwardly e~tending surface 226 of rotary member 209). Rotary member 209 e~tencls along shaft 20 from seal gland 20-~ toward impeller 1~ ancl is provicled at its end adjacent backplate 28 with a helically threacled outwardly facing labyrinth seal 230 closely spaced to, e.g., 0.005 inch away from facing inner surface 232 of the seal housing. The helical labyrinth seal 230 hydroclynamically pumps fluid outwardly from the seal housing upon rotation of the shaft, reducing fluid pressure witllin the seal housing.
Referring to l:igures 2, 3 for locking shaft 20 against rotation during repair work, removable shaft lock 240 (shown in broken lines) may be employed wllicll has a central hole wllicll fits over shaft 20 the llole having a key 2~2 which mates with a keyway 2~ provided in shaft 20. The outer periphery of the shaft lock has a pair of holes 2~6 correspon~ing to threacled holes on the back face of the bearing cartriclge for bolting on the shaft lock to prevent rotation of the shaft assembly.
Other embodimellts are witllill thc followillg claims.
Claims (7)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A centrifugal pump comprising a pump housing, a bladed impeller in said pump housing, a rotatable shaft extending into said pump housing and on which said impeller is mounted, said pump housing having a radially extending wall adjacent said impeller and through which said shaft extends, seal means for sealing said wall through which said shaft extends, and a seal housing for support-ing said seal means and enclosing the portion of said shaft ad-jacent said pump housing, said seal housing being demountably con-nected to said radially extending wall.
2. The centrifugal pump claimed in claim 1 in which the connection between said seal housing and said wall is sealed by an annular seal.
3. The centrifugal pump claimed in claim 1 in which said seal housing comprises a removable wall portion for permitting access to said sealing means and said portion of said shaft within said seal housing.
4. The centrifugal pump claimed in claim 3 further comprising a tube for carrying cooling fluid, said tube having entrance and exit ends passing through said removable wall of said seal housing and a portion of said tube intermediate said tube ends arranged within said seal housing.
5. The centrifugal pump claimed in claim 4 in which said intermediate tube portion is coiled about said seal means and said shaft.
6. The centrifugal pump claimed in claim 1 wherein said sealing means is a packing seal comprising in combination a seal gland for mounting about said shaft, said seal gland adapted for axially adjustable connection to said seal housing member through which said shaft extends, and a rotary member adapted for mounting on and rotation with said shaft, said seal gland and said rotary member having opposed, facing radially extending walls adapted for relative rotation and characterized in that one of said facing walls has a flange extending axially toward the other said facing wall and spaced from the position of said shaft extending through said walls, whereby rope packing may be secured between said facing walls and between said flange and the position of said shaft for sealing said facing walls and whereby pressure between said packing and said walls being sealed may be directly adjusted by adjustment of said seal gland.
7. The centrifugal pump claimed in claim 1 in which flushing apparatus is provided in said housing comprising a tube having an entrance end outside said housing and an exit end extending through a side wall of said housing and oriented to direct fluid passing through said tube into said housing in a direction having a compon-ent tangential to the interior of said housing side wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000493379A CA1208079A (en) | 1982-08-13 | 1985-10-18 | Centrifugal pump |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US40804382A | 1982-08-13 | 1982-08-13 | |
| US408,043 | 1982-08-13 | ||
| CA000434446A CA1204964A (en) | 1982-08-13 | 1983-08-12 | Centrifugal pump |
| CA000493379A CA1208079A (en) | 1982-08-13 | 1985-10-18 | Centrifugal pump |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000434446A Division CA1204964A (en) | 1982-08-13 | 1983-08-12 | Centrifugal pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1208079A true CA1208079A (en) | 1986-07-22 |
Family
ID=25670122
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000493379A Expired CA1208079A (en) | 1982-08-13 | 1985-10-18 | Centrifugal pump |
| CA000493378A Expired CA1208080A (en) | 1982-08-13 | 1985-10-18 | Centrifugal pump |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000493378A Expired CA1208080A (en) | 1982-08-13 | 1985-10-18 | Centrifugal pump |
Country Status (1)
| Country | Link |
|---|---|
| CA (2) | CA1208079A (en) |
-
1985
- 1985-10-18 CA CA000493379A patent/CA1208079A/en not_active Expired
- 1985-10-18 CA CA000493378A patent/CA1208080A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CA1208080A (en) | 1986-07-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |