EP0002157B1 - Pumpe - Google Patents

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Publication number
EP0002157B1
EP0002157B1 EP78400182A EP78400182A EP0002157B1 EP 0002157 B1 EP0002157 B1 EP 0002157B1 EP 78400182 A EP78400182 A EP 78400182A EP 78400182 A EP78400182 A EP 78400182A EP 0002157 B1 EP0002157 B1 EP 0002157B1
Authority
EP
European Patent Office
Prior art keywords
disk
helical grooves
shaft
wheel
pump
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
Application number
EP78400182A
Other languages
English (en)
French (fr)
Other versions
EP0002157A1 (de
Inventor
Jean-Claude Villard
Gilbert Berthereau
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Original Assignee
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude filed Critical LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Publication of EP0002157A1 publication Critical patent/EP0002157A1/de
Application granted granted Critical
Publication of EP0002157B1 publication Critical patent/EP0002157B1/de
Expired legal-status Critical Current

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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
    • F04D29/08—Sealings
    • F04D29/16—Sealings between pressure and suction sides
    • F04D29/165—Sealings between pressure and suction sides especially adapted for liquid pumps
    • F04D29/167—Sealings between pressure and suction sides especially adapted for liquid pumps of a centrifugal flow wheel
    • 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
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/2261—Rotors specially for centrifugal pumps with special measures
    • F04D29/2266—Rotors specially for centrifugal pumps with special measures for sealing or thrust balance

Definitions

  • the present invention relates to a pump of the paddle wheel type mounted at the end of a driving shaft and placed in a casing, each blade forming a conduit extending on one side in an axial wheel body and emerging opposite. a suction duct and on the other hand radially in a wheel runout with radial extension running opposite a tangential discharge duct.
  • French patent 1,505,487 has already proposed a pump having a motor shaft mounted in a pump housing, with, on the shaft outlet side, sealing means with pair of disks facing coaxial and at the lowest axial distance from each other, one fixed and integral with the casing and the other movable in rotation and mounted with axial movement on said shaft, one of said discs having spiral grooves, the other being smooth .
  • Such a rotary junction sealing means has a definite advantage because the liquid layer which is interposed between the discs not only seals but also durably reduces the wear of the moving parts relative to one another. 'other.
  • An object of the invention is to provide seals for a particular pump which are particularly effective in that they certainly avoid undesirable leaks, which improves the yield, and which moreover have almost zero wear by friction. , which gives the pump thus equipped a very long service life and, at the same time, leads to particularly reduced maintenance; a pump according to the invention has very high safety in use.
  • the pump according to the invention is characterized in that, the pump being of the paddle wheel type mounted at the end of said shaft, each blade forming a conduit extending on one side in an axial wheel body and opening out opposite '' a suction duct and on the other side radially in a wheel runout with radial extension running past a tangential delivery duct, the movable disc in rotation of said first rotation means is integral with the wheel runout and in that the axial clearance is due to mounting with limited axial clearance of the wheel on the shaft and in that said pump is equipped, at its suction side, with a second sealing means with double coaxial discs and facing each other, one with spiral grooves, the other smooth, one of which is mounted at the end of said axial wheel body and the other at the end of a medium-blast fixed to the casing around the suction duct.
  • the start-up of a cryogenic pump is made easier and faster thanks to the hydrodynamic junctions described.
  • the shafts of the motor and of the pump may not be aligned as rigorously as in conventional motor-pump units and it is even possible, if desired, to remove the support of the pump by the engine block, which reduces thermal losses by conduction along this support. It is also understood that the technique for producing the pumps is considerably simplified at the same time as their weight is reduced.
  • a cryogenic pump comprises a shaft 1 of a motor 2 extending through a support 3 towards a pump casing 4, where the shaft 1 receives, at the end, an impeller 5 forming a plurality of vanes constituted by identical conduits 6 arranged around the shaft 1 and having an axial suction part 7 in a wheel body 5 ′ located in the vicinity of the shaft 1 and a radial delivery part 8 in a wheel run 5 "with radial extension.
  • the suction parts 7 open out view of a casing opening 9 on which is fixed, by flange 10, a suction duct 11 ..
  • the discharge parts 8 open into the pump casing 4 while scrolling opposite a tangential discharge duct 12.
  • the impeller 5 is associated with two main sealing means, one of these means generally designated by 13 is located on the "shaft outlet” side and aims to prevent leaks of liquid flowing between a front wall 14 of the impeller 5 and a transverse wall 15 of the pump housing 4 (according to arrow f 1 ) on the one hand, between the shaft 1 and a hub 16 of the impeller 5 towards the suction (according to arrow f 2 ) and incidentally along the shaft 1 towards the outside (according to arrow f a ), the other sealing means, generally designated by 18, is located “suction side" of the pump and aims to avoid liquid recirculation leaks, which may occur between one end 19 of the impeller 5 and another wall 20, incorporating the suction opening 9, of the pump housing 4.
  • the two sealing means 13 and 18 both consist of two opposite radial annular discs 22 and 23 for the sealing means 13 and 24, 25 for the sealing means 18.
  • the discs 22 and 24 are secured with the impeller 5, while the discs 23 and 25 are fixed in rotation, the disc 23 being fixed on the casing wall 15, while the disc 25 is fixed in leaktight manner, preferably by its inner periphery 26, to one end of a bellows 28, of which another end 29 is fixed to the casing wall 20 at the periphery of the suction opening 9.
  • each pair of discs 22 and 23 on the one hand and 24, 25 on the other hand must be able to come into contact face against face and deviate somewhat from each other and this simultaneously and in the same direction for the two pairs of discs 22 and 23, 24 and 25.
  • the disc 23 is not only immobilized in axial rotation, but also in axial translation, since it is secured to the casing wall 15, the impeller 5 is mounted with a slight axial movement on the shaft 1 by means of grooves 30, however preventing any rotation movement, this axial movement being moreover limited by a stop 31 more or less screwed at the end of the shaft 1.
  • the disc 24 secured to the impeller 5 since the disc 24 secured to the impeller 5 is not only movable in rotation, but also undergoes axial displacements equal and consistent with those of the disc 22, that is to say in a direction which is opposite to that desired for the disc 24 opposite of the disc 25, the latter disc is provided with a fairly large clearance thanks to the presence of the bellows 28. It is specified that it is only when the pump is stopped, when the impeller 5 stops rotating that the discs 22 and 23 on the one hand, 24 and 25 on the other hand must approach each other until they come to bear face to face.
  • the rotating disc 22 (or 24) has a face opposite the other disc, which is completely smooth, while in the face of the 'another disc 23 or 25 respectively which is fixed in rotation has been made a plurality of grooves in the form of spirals 40 (see Figure 2) of depth equal to a few hundredths of a millimeter, releasing between them, an equal number of projecting spans in spirals 41 which advantageously have the same transverse surface as the grooves 40.
  • a rotation in the direction of arrow F of the rotating mobile disc (22 or 24) relative to the fixed rotating disc (23 or 25 respectively) causes a significant pumping effect on the liquid according to arrows a and a significant increase in pressure since the internal periphery (where this pressure is equal to the suction pressure) towards the external periphery (where the prevailing pressure is the discharge pressure).
  • this pressure increase depends on different parameters, including in particular the nature and in particular the viscosity of the liquid, the number and shape of the grooves (which however always have a logarithmic shape) and the speed of rotation (which is imposed here by the engine working substantially at constant speed).
  • the impeller tends to stop in a position which applies the disc 22 against the disc 23 and the disc 25 against the disc 24 thus ensuring a satisfactory although partial sealing, because the spiral grooves then constitute as many leakage conduits, however, having a high pressure drop due both to their elongation thanks to the spiral shape and their very shallow depth.
  • one or more channels 42 can be provided ensuring sufficient liquid intake at start-up.
  • the shaft sealing means described also serves to receive the axial thrust exerted on the impeller, thus eliminating any other provision for this purpose.
  • FIG. 3 which is an improved version of FIG. 1, a paddle wheel 30, mounted on a shaft 32 is equipped, on the side of the shaft outlet, with a pair of discs 33 and 34; the disc 33 is smooth and extends over a fairly large radial extension of the wheel 30 from the periphery of the shaft 32.
  • the spiral disc has a lesser radial extension and is located opposite a outer peripheral part of the disc 33.
  • an annular groove 36 coaxial with the shaft 32 into which opens a conduit 37 connected to a external source of gas.
  • a paddle wheel 49 is here fitted, on the shaft outlet side 43, with a smooth rotary disc 44 with large radial extension, while a casing wall 45 is here fitted of a grooved disc 46 extending radially over a radially outer part of the smooth disc 44, while facing the remaining radially inner part 44 'of smooth disc 44 is formed, on the casing wall 45, a bearing smooth 47 ensuring a good seal when the pump is stopped, the parts 46 and 47 being separated by a groove 48. This gives a better seal when the pump stops by pressing face against face of the radially inner part 44 'of the disc 44 and the bearing 47.
  • this bearing 47 may be arranged radially outside the disc with spiral grooves 46 as indicated at 47'.
  • the invention applies to all impeller pumps, or turbopumps for conveying liquids, and more particularly cryogenic liquids.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Claims (8)

1. Pumpe mit in einem Pumpengehäuse (4) angeordneter Motorwelle (1) (32) (43), an deren Abgangsseite eine erste Dichteinrichtung (13) mit zwei Scheiben (22-23 Fig. 1), (33-34 Fig. 3), (44-46 Fig. 4) vorgesehen ist, die koaxial und mit höchstens geringem, axialem Abstand einander gegenüber angeordnet sind, wo bei die eine Scheibe (23) (34) (46) am Gehäuse (4) formschlüssig befestigt ist und die andere Scheibe (22) (33) (44) zum Drehen und axialen Schwingen auf der Welle (1) (32) (43) beweglich angeordnet ist, die eine Scheibe (23) (34) (46) mit Spiralrillen versehen ist und die andere Scheibe (22) (33) (44) glatt ist, dadurch gekennzeichnet, daß das Rad (5) (30) (49) mit Schaufeln (6) (31) der Pumpe am Ende der Welle (1) (32) (43) angeordnet ist, jede Schaufel (6) (31) eine Leitung bildet, die sich einerseits in einem Axialteil des Rades (5') erstreckt und gegenüber von einer Saugleitung (11) mündet und sich andererseits radial in einer Radumhüllung (5") erstreckt, eine radiale Ausdehnung gegenüber einer tangentialen Beschickungsleitung (12) vorbeiläuft, die drehbewegliche Scheibe (22) (33) (44) der ersten Dichteinrichtung (13) an der Radumhüllung (5") formschlüssig angeordnet ist, daß infolge einer axial begrenzten Schwingungsmontage (30-31) des Rades (5) auf der Welle (1) (32) (43) die Axialschwingung vorgesehen ist und daß die Pumpe an ihrer Saugseite mit einer zweiten Dichteinrichtung (18) mit Doppelscheiben (24-25) ausgestattet ist, die gegenüberliegend angeordnet sind, von denen die eine Scheibe (25) Spiralrillen aufweist und die andere Scheibe (24) glatt ist und am Ende des axialen Teiles (5') des Rades (5) angeordnet ist, während die andere Scheibe (25) am Ende eines Nabenbalges (28) angeordnet ist, der am Gehäuse (4) um die Saugleitung (11) herum (bei 10) befestigt ist.
2. Pumpe nach Anspruch 1, dadurch gekennzeichnet, daß die Scheibe (25) der zweiten Dichteinrichtung (18) mit ihrem radialen Innenumfang (26) an dem Nabenbalg (28) befestigt ist.
3. Pump nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Scheibe mit den Spiralrillen (46) der ersten Dichteinrichtung (13) außerdem einen radialen glatten Teil (47) aufweist, der geeignet derart ausgestaltet ist, daß er mit einem Teil (44') der glatten Scheibe (44) gegenüber in Berührung kommt.
4. Pumpe nach Anspruch 3, dadurch gekennzeichnet, daß der glatte Teil (47) der Scheibe mit den Spiralrillen (46) dichter an der Welle (43) angeordnet ist als der Teil mit den Spiralen der Spiralscheibe (46).
5. Pumpe nach Anspruch 3, dadurch gekennzeichnet, daß der glatte Teil (47) der Scheibe mit den Spiralrillen (46) mit einem größeren Radialabstand von der Welle (43) angeordnet ist als der Teil mit den Spiralen der Scheibe (46) mitSpiralen.
6. Pumpe nach einem der Ansprüche 3 bis 5, dadurch gekennzeichnet, daß die glatte Scheibe (44) mit dem sich drehenden Rad (42) formschlüssig verbunden ist, während die Scheibe (46) mit den Spiralrillen bei Drehung formschlüssig mit dem Gehäuse (45) verbunden ist.
7. Pumpe nach Anspruch 1, dadurch gekennzeichnet, daß die eine (34) der zwei Scheiben (33-34) radial innerhalb des Teiles mit den Spiralrillen, und zwar der Spiralrillenscheibe (34), eine ringförmige Auskehlung (36) aufweist, die über eine Leitung (37) mit einer Gasquelle verbunden ist, während ein radial innerhalb dieser Auskehlung (36) befindlicher Teil eine Labyrinthdichtung (38) bildet.
8. Pumpe nach Anspruch 1, dadurch gekennzeichnet, daß in der Umhüllung (5") des Radteiles (5) ein Kanal (42) angeordnet ist, der in einer Zone radial innerhalb der Dichtvorrichtung (18) des Wellenausgangs mündet.
EP78400182A 1977-11-22 1978-11-15 Pumpe Expired EP0002157B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7735036A FR2409406A1 (fr) 1977-11-22 1977-11-22 Procede de realisation des etancheites interne et de sortie d'arbre d'une pompe et pompe mettant en oeuvre ce procede
FR7735036 1977-11-22

Publications (2)

Publication Number Publication Date
EP0002157A1 EP0002157A1 (de) 1979-05-30
EP0002157B1 true EP0002157B1 (de) 1980-10-29

Family

ID=9197885

Family Applications (1)

Application Number Title Priority Date Filing Date
EP78400182A Expired EP0002157B1 (de) 1977-11-22 1978-11-15 Pumpe

Country Status (6)

Country Link
US (1) US4242039A (de)
EP (1) EP0002157B1 (de)
JP (1) JPS5478509A (de)
DE (1) DE2860265D1 (de)
FR (1) FR2409406A1 (de)
IT (1) IT1100276B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3939156A1 (de) * 1989-11-27 1991-05-29 Grundfos Int Zusammengesetztes laufrad fuer eine kreiselpumpe

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3939156A1 (de) * 1989-11-27 1991-05-29 Grundfos Int Zusammengesetztes laufrad fuer eine kreiselpumpe

Also Published As

Publication number Publication date
EP0002157A1 (de) 1979-05-30
IT1100276B (it) 1985-09-28
DE2860265D1 (en) 1981-01-29
US4242039A (en) 1980-12-30
FR2409406A1 (fr) 1979-06-15
IT7829714A0 (it) 1978-11-13
JPS5478509A (en) 1979-06-22

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