CA1325552C - Self-priming centrifugal pump for dangerous, particularly radio-active liquids - Google Patents
Self-priming centrifugal pump for dangerous, particularly radio-active liquidsInfo
- Publication number
- CA1325552C CA1325552C CA000570006A CA570006A CA1325552C CA 1325552 C CA1325552 C CA 1325552C CA 000570006 A CA000570006 A CA 000570006A CA 570006 A CA570006 A CA 570006A CA 1325552 C CA1325552 C CA 1325552C
- Authority
- CA
- Canada
- Prior art keywords
- wheel
- pump
- hole
- oval groove
- suction
- 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 - Fee Related
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
- F04D9/00—Priming; Preventing vapour lock
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D5/00—Pumps with circumferential or transverse flow
- F04D5/002—Regenerative pumps
-
- 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
- F04D29/605—Mounting; Assembling; Disassembling specially adapted for liquid pumps
- F04D29/606—Mounting in cavities
Abstract
ABSTRACT OF THE DISCLOSURE
This invention relates to a vertical self-priming centrifugal pump, placed beneath a protective slab, constituted by a fixed bowl welded to suction and delivery pipes and by a mobile equipment adapted to be extracted via the top, characterized in that the hydraulic part is constituted by a wheel with radial vanes driven by a drive motor, said wheel rotating between a lower plate provided with a suction hole and an upper partition having an oval groove hollowed out therein on the wheel side, said groove terminating in a hole allowing evacuation of the liquid.
This invention relates to a vertical self-priming centrifugal pump, placed beneath a protective slab, constituted by a fixed bowl welded to suction and delivery pipes and by a mobile equipment adapted to be extracted via the top, characterized in that the hydraulic part is constituted by a wheel with radial vanes driven by a drive motor, said wheel rotating between a lower plate provided with a suction hole and an upper partition having an oval groove hollowed out therein on the wheel side, said groove terminating in a hole allowing evacuation of the liquid.
Description
132~S2 FIELD OF T~E INVENTION
The present invention relates to a self-priming centrifugal pump for dangerous, particularly radio-active liquids.
5BACKGRO~ND OF THE INVENTION
, Particular precautions should be taken when transferring dangerous liquids, particularly r~dio-~ active liquids, between two recipients (reservoirs, ; apparatus, etc... ), one being a lower recipient and 10 the other an upper recipient, by means of a pump, namely:
a) the pump must be placed above the lower recipient, any damage of the pump leading to a leakage ,' does not lead to spillage of all the liquid of the ,, lS recipient, ' b) the delivery pipe must not be immersed in the liquid of the upper recipient, a stoppage of the pump or a leakage must not siphon the contents of the upper recipient, c) the pump must be dismountable without inter-rupting the pipe between the two recipients, ~ d) when the pump is used, more especially ¦ for radio'active liquids, it may be provided to place ~ the two recipients, the pump and the pipes in a "cell".
1,~ It is advantageous to place the pump on the ,~ ceiling of the cell, with the vertical drive shaft passing through the ceiling slab, the electric motor ', of the pump thus being outside the cell, therefore ! , easily accessible.
A pump allowing such transfers of liquid and presenting these various advantages has been described in French Patent No. 76 24748.
The pump described in this Patent comprises, ~ on the outside, a bowl on which are welded the suction 'i 35 and delivery pipes and an inner hydraulic part which '1 2 132~2 : is disposed (with seal) in said bowl and which may be dismounted vertically with protection.
The present invention is a pump of which the configura~ion is the same as that described in said French Patent but which proposes a different inner hydraulic part which is particularly better adapted to the transfers of liqu.ids with low flowrates (for example of the order of 2 m3/hr.3.
SVMMARY OF THE INVENTION
,. 10 The present invention therefore relates in one aspect to a vertical self-priming centrifugal pump, placed beneath a concrete slab, constituted by a fixed bowl welded to suction and delivery pipes and fixed under said slab and by an inner hydraulic part disposed . 15 in tight manner in said bowl and adapted to be extrac-:? ted via the top, characterized in that said hydraulic part is constituted by a wheel with radial vanes driven by a drive motor traversing said slab, said wheel rotating between a lower plate provided with 20 a suction hole and an upper part.ition forming the bottom of a chamber and having an oval groove hollowed out therein on the wheel side, said groove passing around said partition and being closed at one of its ends and terminated by a hole at the other of ~5 its ends, said hole allowing ev~ouation of ~he liquid.
' '; ~:' .~ .
.
., :, . . ~:. :.. ~ . . ~ .. , . .. .. , . - , 132~52 2a Another aspect of the invention is as follows:
A vertical self-priming centrifugal pump, placed beneath a concrete slab, constituted by a fixed bowl welded --to a suction pipe and a delivery pipe and by a mobile equipment adapted to be extracted via the top, said equipment being tightly arranged in said bowl so as to form a suction chamber and a delivery chamber isolated from each other, characterized in that:
the hydraulic part of said pump is constituted by a wheel with radial vanes driven by a drive shaft;
"J, 15 said wheel rotates between a lower plate provided with a suction hole coming out in said suction chamber and an upper partition having an oval groove hollowed out therein on the wheel side, said oval groove terminating in a first hole allowing evacuation of the liquid in said delivery chamber; said upper partition being provided first with a second hole located virtually on the same radius as said first hole but nearest the axis and secondly on its face ;~ opposite said wheel with a plate separating said holes.
~ BRIEF DESCRIPTION OF T~E DRAWINGS
i 25 The invention will be more readily understood on reading the following description with referenre to the accompanying drawings, in which:
Fig. 1 is a general vertical section schematically showing the positions of the pump and of its motor in a concrete slab.
Fig. 2 iq a vertical section through the pump.
Fig. 3 is an exploded view in perspective of the hydraulio part. ;;
~.
. , .
The present invention relates to a self-priming centrifugal pump for dangerous, particularly radio-active liquids.
5BACKGRO~ND OF THE INVENTION
, Particular precautions should be taken when transferring dangerous liquids, particularly r~dio-~ active liquids, between two recipients (reservoirs, ; apparatus, etc... ), one being a lower recipient and 10 the other an upper recipient, by means of a pump, namely:
a) the pump must be placed above the lower recipient, any damage of the pump leading to a leakage ,' does not lead to spillage of all the liquid of the ,, lS recipient, ' b) the delivery pipe must not be immersed in the liquid of the upper recipient, a stoppage of the pump or a leakage must not siphon the contents of the upper recipient, c) the pump must be dismountable without inter-rupting the pipe between the two recipients, ~ d) when the pump is used, more especially ¦ for radio'active liquids, it may be provided to place ~ the two recipients, the pump and the pipes in a "cell".
1,~ It is advantageous to place the pump on the ,~ ceiling of the cell, with the vertical drive shaft passing through the ceiling slab, the electric motor ', of the pump thus being outside the cell, therefore ! , easily accessible.
A pump allowing such transfers of liquid and presenting these various advantages has been described in French Patent No. 76 24748.
The pump described in this Patent comprises, ~ on the outside, a bowl on which are welded the suction 'i 35 and delivery pipes and an inner hydraulic part which '1 2 132~2 : is disposed (with seal) in said bowl and which may be dismounted vertically with protection.
The present invention is a pump of which the configura~ion is the same as that described in said French Patent but which proposes a different inner hydraulic part which is particularly better adapted to the transfers of liqu.ids with low flowrates (for example of the order of 2 m3/hr.3.
SVMMARY OF THE INVENTION
,. 10 The present invention therefore relates in one aspect to a vertical self-priming centrifugal pump, placed beneath a concrete slab, constituted by a fixed bowl welded to suction and delivery pipes and fixed under said slab and by an inner hydraulic part disposed . 15 in tight manner in said bowl and adapted to be extrac-:? ted via the top, characterized in that said hydraulic part is constituted by a wheel with radial vanes driven by a drive motor traversing said slab, said wheel rotating between a lower plate provided with 20 a suction hole and an upper part.ition forming the bottom of a chamber and having an oval groove hollowed out therein on the wheel side, said groove passing around said partition and being closed at one of its ends and terminated by a hole at the other of ~5 its ends, said hole allowing ev~ouation of ~he liquid.
' '; ~:' .~ .
.
., :, . . ~:. :.. ~ . . ~ .. , . .. .. , . - , 132~52 2a Another aspect of the invention is as follows:
A vertical self-priming centrifugal pump, placed beneath a concrete slab, constituted by a fixed bowl welded --to a suction pipe and a delivery pipe and by a mobile equipment adapted to be extracted via the top, said equipment being tightly arranged in said bowl so as to form a suction chamber and a delivery chamber isolated from each other, characterized in that:
the hydraulic part of said pump is constituted by a wheel with radial vanes driven by a drive shaft;
"J, 15 said wheel rotates between a lower plate provided with a suction hole coming out in said suction chamber and an upper partition having an oval groove hollowed out therein on the wheel side, said oval groove terminating in a first hole allowing evacuation of the liquid in said delivery chamber; said upper partition being provided first with a second hole located virtually on the same radius as said first hole but nearest the axis and secondly on its face ;~ opposite said wheel with a plate separating said holes.
~ BRIEF DESCRIPTION OF T~E DRAWINGS
i 25 The invention will be more readily understood on reading the following description with referenre to the accompanying drawings, in which:
Fig. 1 is a general vertical section schematically showing the positions of the pump and of its motor in a concrete slab.
Fig. 2 iq a vertical section through the pump.
Fig. 3 is an exploded view in perspective of the hydraulio part. ;;
~.
. , .
-3 132~2 Fig. 4 is a perspective view of the lower closure of the hydraulic part.
Fig. 5 is a vertical section through the dis-mountable equipment.
5Fig. 6 is an enlarged vertical section of the hydraulic part.
Fig. 7 is a seal design.
DETAILED DESC~IPTION OF THE DRAWINGS
Referring now to the drawings, and firstly 10 to Fig. 1 which shows the general arrangement, a horizontal concrete slab 3 separates an upper cell 1 and a lower cell 2. Cell 2 containing dangerous products is inaccessible to the personnel, whilst J; cell 1 is intended to remain clean and accessible.
15The pump 4 is placed in the lower cell, whilst , the drive motor 7 is located in cell 1.
q Assembly of the motor includes a cage element 8, the drive shaft 6 and a ball bearing housing 5.
A coupling is placed between the motor and the shaft.
20As to the general constitution of the pump, it is constituted by an outer bowl with conduit, a dismountable equipment, a rotating hydraulic equip-! ment, ball bearings, fixed seals, rotating seals.
The pump is thus constituted by a bowl 15, 25 generally cylindrical in shape, of which the open upper part forms a flange fixed to the concrete slab 3 and of which the lower part is closed.
The bowl comprises three welded conduits (and welded to the pipes): a suction conduit 18, a delivery 30 conduit 24 and a ventilation conduit (not shown).
The suction conduit is welded to the pipe conducting the fluid to be pumped.
The delivery conduit is welded to the pipe conducting the pumped liquid~
35The ventilation conduit is connected to a -4- ~ 32~2 general ventilation system.
The bowl must be considered as fixed and con-stituting a whole with the pipes.
`In the bowl is located all the hydraulic part 5 of the pump; this part is adapted to be extracted ; and comprises a rotating equipment and a mobile equip-1 ment (the adjective mobile being employed to recall s that said mobile equipment is extractable but, in the operation of the pump, said mobile equipment 10 is7 of course, fixed).
The rotating equipment is shown in Fig. 2 mounted in the bowl, and in exploded view for the vaned wheel in Fig. 3.
Figs. 2 and 3 show the rotating equipment ¦ 15 which comprises:
- a drive shaft 6 guided in the upper part ¦ by the ball bearings 25, - the packings (or rotating seals) 9, - at 13, at the lower end of the shaft, a ~ 20 vaned wheel of which the radially disposed vanes J, are rectangular and regularly spaced apart. The arc of circumference between two consecutive vanes is included between 10 and 30 and preferably close to 15. It will be noted that the vaned wheel compri-25 ses a solid central ring 34 (Fig. 6) (not vaned).
i Figs. 2, 3, 4, 5 and 6 also show the mobile equipment which, to within a few details, is in the ;-~ form of a piece of revolution about the axis of the ;J (vertical) drive shaft 6.
The upper part of the mobile equipment compri-ses flat parts which, abutting on corresponding flat parts of the bowl, ensure tightness thanks to two seals 30 and 32 (Fig. 5).
I The lower part of the mobile equipment forms .~ :
.
~32~2 a cylindrical box limited laterally by a wall 11, downwardly by the removable base plate 14 (held in place by screws 33 - Fig. 6) pierced wlth an orifice provided with a nozzle ]6, and upwardly by a plate perforated with holes 29. The central part of this mobile equipment surrounds the drive shaft 6, obviou~ly leaving the necessary space for the or each packing 9. Inside the cylindrical box lies a horizontal partition 20 which divides the interior 10 of the box into two parts, a lower part which will contain the vaned wheel 13 and an upper part 12 (Fig.
7) forming delivery chamber.
Said partition 20 therefore defines the lower chamber in which the vaned wheel 13 is disposed;
15 this partition and the role that it performs in the invention are described hereinafter with reference more particularly to Figs. 4 and 6.
This partition is in the form of a thick circu-lar disc in which a groove 23 is made on the lower 20 face. (It is recalled that Fig. 4 shows the partition turned over in order to show the groove).
The groove terminates in a hole 21 traversing , the partition 20. A second hole 22 lying on the same ¦ radius as the first hole 21, but nearer the centre, 25 likewise traverses the partition 20.
In the upper part (cf. in particular Figs.
2 and 3), a small plate 17 separates the two holes 21 and 22.
The groove 23 is surrounded by a flat part 30 35.
Fig. 6 shows that the groove 23 is in the form of a semi-oval, for example a "basket handle".
Similarly, Fig. 6 shows that the lateral wall '~ 11 must, inside, present in the lower part, a concave 35 section 31 extending the section of the groove 23.
132~2 ~ -6-' .
The relative dimensions (in diameter) of the groove 23 and of the vaned wheel 13 are clearly indi-cated in Fig. 6: the vane must occupy between 3/4 and 2/3 of the groove.
With Ra being the maximum radius of the vaned wheel, Re the outer radius of the groove, Ri its inner radius, the following is preferable.
Re ~ (Re Ri) ~ a > Re ~ ~ (Re ~ Ri~-On the contrary, the radius Rm of the hub 10 34 of the vaned wheel 13 must be notably smaller than the inner radius Ri of the groove.
Fig. 6 shows that there is a clearance between the vaned wheel 13 and the partition 20 on the one hand, and the base plate 14, on the other hand. This lS clearance must allow free rotation of the wheel, but must be small enough for the capillary forces I to ensure tightness of the two sides of the vaned ¦ wheel.
j A clearance of 0.1 mm may be proposed as pre-s 20 ferred value.
Correct operation of the pump according to ! the invention involves, as the specialist will readily 1 appreciate, that there is independence, i.e. prefe-1 rably tightness, between the suction chamber 19 (Figs.
25 2 and 7) comprised between the bowl and the mobile equipment and the delivery chamber 12 (Fig. 7).
A seal may be placed between the wall 11 and the boss 39 of the bowl, or metal segments 38 may preferably be placed in grooves 36, 37 in the wall ' 30 11. The segments are preferably two in number.
¦ It will be noted that it is imperative to 3 leave a clearance between the diameter of the groove ~j bottom and the inner diameter of the segment, in order to allow assembly of the pump.
A slight leakage may be tolerated at the level , "
., ~ 132~2 of the metal segments; the sole drawback thereof is that the flowrate of the pump is reduced, but only very slightly.
The mode of operation of the pump according to the invention which, it is recalled, is a self-priming centrifugal pump, will now be briefly des-cribed.
The starting point is a stopped pump containing ;enough liquid for immersion of the wheel; there is :10 air in the suction pipe and in the upper part of the bowl.
Upon rotation, the liquid present in the groove 23 is driven, through hole 21, into chamber 12.
This volume of liquid is replaced by the same volume of air coming from conduit 16.
`,Rotation of the wheel mixes water and air and an unstable "emulsion" leaves via hole 21. In zone 12 there is separation of the air which leaves via holes 29 and of the water which drops via hole 22 towards the wheel.
The plate 17 separating the two holes prevents the emulsion from dropping through hole 22 before the separation of the water and air.
The same cycle is renewed until all the air of the suction pipe has been evacuated towards deli-very. The liquid to be sucked then fills the pump which takes its normal hydraulic regime as peripheral channel pump. Suction takes place in the bottom of the bowl via conduit 16, delivery occurs via hole 21 in chamber 12 then via holes 29 in the delivery chamber 12' and the delivery conduit 24.
A pump is therefore set into operation, which is located above the reservoir of liquid to be dis-placed, without any valve, this eliminating the risk of leakage.
-8- 1~2~2 For dismantling the pump, it will be noted that, by removing the motor, then the coupling, the whole interior of the pump: mobile equipment and ' rotating part, can be extracted through the hole in the separating slab. The pump being placed abo~e the reservoir and the pipes being welded to the bowl which remains in place, there is no spilt liquid.
It is necessary to protect the personnel fro~
the liquid remaining on the extracted part of the 10 pump when said liquid is radio-active.
Finally, the dimensions and characteristics of one of the pumps which may be made according to the invention will be mentioned:
- vaned wheel with a diameter of 90 mm; thick-15 ness 10 mm and comprising 24 vanes;
- speed of rotation of the drive shaft:
2900/rpm; with said pump and pumping cold water whose ; level is at 6.5 m below the pump, a flowrate of 1500 l/hr. is ensured if the delivery level of the water 20 is at 46 m, and of 2000 l/hr. if the delivery level is at 25 m.
This same wheel, used in a known centrifugal pump, would give a total manometric lift about 4 times lower.
, .
~ ~:
. 1 .
' "~ - .
: '~ ' ' .
Fig. 5 is a vertical section through the dis-mountable equipment.
5Fig. 6 is an enlarged vertical section of the hydraulic part.
Fig. 7 is a seal design.
DETAILED DESC~IPTION OF THE DRAWINGS
Referring now to the drawings, and firstly 10 to Fig. 1 which shows the general arrangement, a horizontal concrete slab 3 separates an upper cell 1 and a lower cell 2. Cell 2 containing dangerous products is inaccessible to the personnel, whilst J; cell 1 is intended to remain clean and accessible.
15The pump 4 is placed in the lower cell, whilst , the drive motor 7 is located in cell 1.
q Assembly of the motor includes a cage element 8, the drive shaft 6 and a ball bearing housing 5.
A coupling is placed between the motor and the shaft.
20As to the general constitution of the pump, it is constituted by an outer bowl with conduit, a dismountable equipment, a rotating hydraulic equip-! ment, ball bearings, fixed seals, rotating seals.
The pump is thus constituted by a bowl 15, 25 generally cylindrical in shape, of which the open upper part forms a flange fixed to the concrete slab 3 and of which the lower part is closed.
The bowl comprises three welded conduits (and welded to the pipes): a suction conduit 18, a delivery 30 conduit 24 and a ventilation conduit (not shown).
The suction conduit is welded to the pipe conducting the fluid to be pumped.
The delivery conduit is welded to the pipe conducting the pumped liquid~
35The ventilation conduit is connected to a -4- ~ 32~2 general ventilation system.
The bowl must be considered as fixed and con-stituting a whole with the pipes.
`In the bowl is located all the hydraulic part 5 of the pump; this part is adapted to be extracted ; and comprises a rotating equipment and a mobile equip-1 ment (the adjective mobile being employed to recall s that said mobile equipment is extractable but, in the operation of the pump, said mobile equipment 10 is7 of course, fixed).
The rotating equipment is shown in Fig. 2 mounted in the bowl, and in exploded view for the vaned wheel in Fig. 3.
Figs. 2 and 3 show the rotating equipment ¦ 15 which comprises:
- a drive shaft 6 guided in the upper part ¦ by the ball bearings 25, - the packings (or rotating seals) 9, - at 13, at the lower end of the shaft, a ~ 20 vaned wheel of which the radially disposed vanes J, are rectangular and regularly spaced apart. The arc of circumference between two consecutive vanes is included between 10 and 30 and preferably close to 15. It will be noted that the vaned wheel compri-25 ses a solid central ring 34 (Fig. 6) (not vaned).
i Figs. 2, 3, 4, 5 and 6 also show the mobile equipment which, to within a few details, is in the ;-~ form of a piece of revolution about the axis of the ;J (vertical) drive shaft 6.
The upper part of the mobile equipment compri-ses flat parts which, abutting on corresponding flat parts of the bowl, ensure tightness thanks to two seals 30 and 32 (Fig. 5).
I The lower part of the mobile equipment forms .~ :
.
~32~2 a cylindrical box limited laterally by a wall 11, downwardly by the removable base plate 14 (held in place by screws 33 - Fig. 6) pierced wlth an orifice provided with a nozzle ]6, and upwardly by a plate perforated with holes 29. The central part of this mobile equipment surrounds the drive shaft 6, obviou~ly leaving the necessary space for the or each packing 9. Inside the cylindrical box lies a horizontal partition 20 which divides the interior 10 of the box into two parts, a lower part which will contain the vaned wheel 13 and an upper part 12 (Fig.
7) forming delivery chamber.
Said partition 20 therefore defines the lower chamber in which the vaned wheel 13 is disposed;
15 this partition and the role that it performs in the invention are described hereinafter with reference more particularly to Figs. 4 and 6.
This partition is in the form of a thick circu-lar disc in which a groove 23 is made on the lower 20 face. (It is recalled that Fig. 4 shows the partition turned over in order to show the groove).
The groove terminates in a hole 21 traversing , the partition 20. A second hole 22 lying on the same ¦ radius as the first hole 21, but nearer the centre, 25 likewise traverses the partition 20.
In the upper part (cf. in particular Figs.
2 and 3), a small plate 17 separates the two holes 21 and 22.
The groove 23 is surrounded by a flat part 30 35.
Fig. 6 shows that the groove 23 is in the form of a semi-oval, for example a "basket handle".
Similarly, Fig. 6 shows that the lateral wall '~ 11 must, inside, present in the lower part, a concave 35 section 31 extending the section of the groove 23.
132~2 ~ -6-' .
The relative dimensions (in diameter) of the groove 23 and of the vaned wheel 13 are clearly indi-cated in Fig. 6: the vane must occupy between 3/4 and 2/3 of the groove.
With Ra being the maximum radius of the vaned wheel, Re the outer radius of the groove, Ri its inner radius, the following is preferable.
Re ~ (Re Ri) ~ a > Re ~ ~ (Re ~ Ri~-On the contrary, the radius Rm of the hub 10 34 of the vaned wheel 13 must be notably smaller than the inner radius Ri of the groove.
Fig. 6 shows that there is a clearance between the vaned wheel 13 and the partition 20 on the one hand, and the base plate 14, on the other hand. This lS clearance must allow free rotation of the wheel, but must be small enough for the capillary forces I to ensure tightness of the two sides of the vaned ¦ wheel.
j A clearance of 0.1 mm may be proposed as pre-s 20 ferred value.
Correct operation of the pump according to ! the invention involves, as the specialist will readily 1 appreciate, that there is independence, i.e. prefe-1 rably tightness, between the suction chamber 19 (Figs.
25 2 and 7) comprised between the bowl and the mobile equipment and the delivery chamber 12 (Fig. 7).
A seal may be placed between the wall 11 and the boss 39 of the bowl, or metal segments 38 may preferably be placed in grooves 36, 37 in the wall ' 30 11. The segments are preferably two in number.
¦ It will be noted that it is imperative to 3 leave a clearance between the diameter of the groove ~j bottom and the inner diameter of the segment, in order to allow assembly of the pump.
A slight leakage may be tolerated at the level , "
., ~ 132~2 of the metal segments; the sole drawback thereof is that the flowrate of the pump is reduced, but only very slightly.
The mode of operation of the pump according to the invention which, it is recalled, is a self-priming centrifugal pump, will now be briefly des-cribed.
The starting point is a stopped pump containing ;enough liquid for immersion of the wheel; there is :10 air in the suction pipe and in the upper part of the bowl.
Upon rotation, the liquid present in the groove 23 is driven, through hole 21, into chamber 12.
This volume of liquid is replaced by the same volume of air coming from conduit 16.
`,Rotation of the wheel mixes water and air and an unstable "emulsion" leaves via hole 21. In zone 12 there is separation of the air which leaves via holes 29 and of the water which drops via hole 22 towards the wheel.
The plate 17 separating the two holes prevents the emulsion from dropping through hole 22 before the separation of the water and air.
The same cycle is renewed until all the air of the suction pipe has been evacuated towards deli-very. The liquid to be sucked then fills the pump which takes its normal hydraulic regime as peripheral channel pump. Suction takes place in the bottom of the bowl via conduit 16, delivery occurs via hole 21 in chamber 12 then via holes 29 in the delivery chamber 12' and the delivery conduit 24.
A pump is therefore set into operation, which is located above the reservoir of liquid to be dis-placed, without any valve, this eliminating the risk of leakage.
-8- 1~2~2 For dismantling the pump, it will be noted that, by removing the motor, then the coupling, the whole interior of the pump: mobile equipment and ' rotating part, can be extracted through the hole in the separating slab. The pump being placed abo~e the reservoir and the pipes being welded to the bowl which remains in place, there is no spilt liquid.
It is necessary to protect the personnel fro~
the liquid remaining on the extracted part of the 10 pump when said liquid is radio-active.
Finally, the dimensions and characteristics of one of the pumps which may be made according to the invention will be mentioned:
- vaned wheel with a diameter of 90 mm; thick-15 ness 10 mm and comprising 24 vanes;
- speed of rotation of the drive shaft:
2900/rpm; with said pump and pumping cold water whose ; level is at 6.5 m below the pump, a flowrate of 1500 l/hr. is ensured if the delivery level of the water 20 is at 46 m, and of 2000 l/hr. if the delivery level is at 25 m.
This same wheel, used in a known centrifugal pump, would give a total manometric lift about 4 times lower.
, .
~ ~:
. 1 .
' "~ - .
: '~ ' ' .
Claims (6)
1. A vertical self-priming centrifugal pump, placed beneath a concrete slab, constituted by a fixed bowl welded to a suction pipe and a delivery pipe and by a mobile equipment adapted to be extracted via the top, said equipment being tightly arranged in said bowl so as to form a suction chamber and a delivery chamber isolated from each other, characterized in that:
the hydraulic part of said pump is constituted by a wheel with radial vanes driven by a drive shaft;
said wheel rotates between a lower plate provided with a suction hole coming out in said suction chamber and an upper partition having an oval groove hollowed out therein on the wheel side, said oval groove terminating in a first hole allowing evacuation of the liquid in said delivery chamber; said upper partition being provided first with a second hole located virtually on the same radius as said first hole but nearest the axis and secondly on its face opposite said wheel with a plate separating said holes.
the hydraulic part of said pump is constituted by a wheel with radial vanes driven by a drive shaft;
said wheel rotates between a lower plate provided with a suction hole coming out in said suction chamber and an upper partition having an oval groove hollowed out therein on the wheel side, said oval groove terminating in a first hole allowing evacuation of the liquid in said delivery chamber; said upper partition being provided first with a second hole located virtually on the same radius as said first hole but nearest the axis and secondly on its face opposite said wheel with a plate separating said holes.
2. A pump according to claim 1, characterized in that said delivery chamber is divided into two compartments by a perforated plate.
3. A pump according to claim 1, characterized in that tightness is secured around said drive shaft through packing means.
4. A pump according to claim 1, characterized in that said oval groove has a section in the form of a basket handle and in that the lower part of the lateral wall of the mobile equipment has a section extending without discontinuity the section of said oval groove.
5. A pump according to claim 1, characterized in that the tightness between said fixed bowl and the mobile equipment is ensured by one or more metal segments each placed in a groove made in the lateral wall of said mobile equipment.
6. A pump according to claim 1, characterized in that the outer radius Ra of said wheel with radial vanes, the outer radius Re of said oval groove and the inner radius Ri of said oval groove are linked by the inequation:
Re - ?(Re - Ri) > Ra > Re - ?(Re - Ri)
Re - ?(Re - Ri) > Ra > Re - ?(Re - Ri)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8708726A FR2616853B1 (en) | 1987-06-22 | 1987-06-22 | SELF-PRIMING CENTRIFUGAL PUMP FOR DANGEROUS LIQUIDS ESPECIALLY RADIOACTIVE |
| FR8708726 | 1987-06-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1325552C true CA1325552C (en) | 1993-12-28 |
Family
ID=9352340
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000570006A Expired - Fee Related CA1325552C (en) | 1987-06-22 | 1988-06-21 | Self-priming centrifugal pump for dangerous, particularly radio-active liquids |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP0296952B1 (en) |
| JP (1) | JP2637477B2 (en) |
| KR (1) | KR960016790B1 (en) |
| CN (1) | CN1015126B (en) |
| BR (1) | BR8803160A (en) |
| CA (1) | CA1325552C (en) |
| DE (1) | DE3868719D1 (en) |
| ES (1) | ES2030184T3 (en) |
| FR (1) | FR2616853B1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4211033C2 (en) * | 1992-04-02 | 2000-08-03 | Ksb Ag | Centrifugal pump unit |
Family Cites Families (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE761490C (en) * | 1941-06-28 | 1954-01-25 | Siemens Schuckertwerke A G | Submersible pump |
| FR1334408A (en) * | 1962-06-25 | 1963-08-09 | Moteurs Leroy | Alternator pole wheel |
| FR1334508A (en) * | 1962-06-29 | 1963-08-09 | Wauquier Soc Nouv Ets | Method of constructing centrifugal pumps with vertical axis and pumps produced by this method |
| FR1356951A (en) * | 1962-12-19 | 1964-04-03 | Materiel Telephonique | Vertical pump |
| JPS4213729Y1 (en) * | 1964-03-16 | 1967-08-04 | ||
| FR1593585A (en) * | 1968-10-09 | 1970-06-01 | ||
| PL81606B1 (en) * | 1970-12-31 | 1975-08-30 | ||
| JPS5730466Y2 (en) * | 1976-07-30 | 1982-07-03 | ||
| FR2361558A1 (en) * | 1976-08-13 | 1978-03-10 | Saint Gobain Techn Nouvelles | SELF-PRIMING CENTRIFUGAL PUMPS IMPROVEMENTS |
| JPS5824637B2 (en) * | 1976-09-30 | 1983-05-23 | 株式会社ワ−ルドケミカル | self-priming pump |
| DE7714506U1 (en) * | 1977-05-07 | 1977-08-18 | Hermetic-Pumpen Gmbh, 7803 Gundelfingen | PUMP UNIT, IN PARTICULAR CANNED MOTOR PUMP UNIT |
| JPS5664193A (en) * | 1979-12-06 | 1981-06-01 | Anretsuto:Kk | Self-suction box of clean water self-suction system line pump |
| JPS5896289A (en) * | 1981-12-04 | 1983-06-08 | 株式会社日立製作所 | Gasket of internal pump |
| DE3327922C2 (en) * | 1983-08-03 | 1994-02-10 | Bosch Gmbh Robert | Fuel delivery unit |
| JPS616700U (en) * | 1984-06-20 | 1986-01-16 | 共同エンジニアリング株式会社 | self-priming pump |
| JPS6134388A (en) * | 1985-02-25 | 1986-02-18 | Hitachi Ltd | Method of manufacturing synthetic resin pump |
| JPS6375665U (en) * | 1986-11-07 | 1988-05-20 |
-
1987
- 1987-06-22 FR FR8708726A patent/FR2616853B1/en not_active Expired
-
1988
- 1988-06-20 EP EP88401531A patent/EP0296952B1/en not_active Expired - Lifetime
- 1988-06-20 DE DE8888401531T patent/DE3868719D1/en not_active Expired - Fee Related
- 1988-06-20 ES ES198888401531T patent/ES2030184T3/en not_active Expired - Lifetime
- 1988-06-21 CA CA000570006A patent/CA1325552C/en not_active Expired - Fee Related
- 1988-06-22 BR BR8803160A patent/BR8803160A/en not_active IP Right Cessation
- 1988-06-22 CN CN88103780A patent/CN1015126B/en not_active Expired
- 1988-06-22 KR KR1019880007529A patent/KR960016790B1/en not_active IP Right Cessation
- 1988-06-22 JP JP63152460A patent/JP2637477B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| KR890000795A (en) | 1989-03-16 |
| JP2637477B2 (en) | 1997-08-06 |
| JPH01117994A (en) | 1989-05-10 |
| EP0296952A1 (en) | 1988-12-28 |
| EP0296952B1 (en) | 1992-03-04 |
| CN1030815A (en) | 1989-02-01 |
| BR8803160A (en) | 1989-02-08 |
| DE3868719D1 (en) | 1992-04-09 |
| FR2616853B1 (en) | 1989-11-17 |
| ES2030184T3 (en) | 1992-10-16 |
| FR2616853A1 (en) | 1988-12-23 |
| KR960016790B1 (en) | 1996-12-21 |
| CN1015126B (en) | 1991-12-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |