WO2011020136A1 - Rotor de pompe perfectionné - Google Patents

Rotor de pompe perfectionné Download PDF

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Publication number
WO2011020136A1
WO2011020136A1 PCT/AU2010/000772 AU2010000772W WO2011020136A1 WO 2011020136 A1 WO2011020136 A1 WO 2011020136A1 AU 2010000772 W AU2010000772 W AU 2010000772W WO 2011020136 A1 WO2011020136 A1 WO 2011020136A1
Authority
WO
WIPO (PCT)
Prior art keywords
hub
shaft
impeller
sleeve
retainer
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.)
Ceased
Application number
PCT/AU2010/000772
Other languages
English (en)
Inventor
Mark Andrew Lance
Robert Bruce Davidson
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.)
Davey Water Products Pty Ltd
Original Assignee
Davey Water Products Pty Ltd
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
Priority claimed from AU2009903926A external-priority patent/AU2009903926A0/en
Application filed by Davey Water Products Pty Ltd filed Critical Davey Water Products Pty Ltd
Publication of WO2011020136A1 publication Critical patent/WO2011020136A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • F04D29/18—Rotors
    • F04D29/20—Mounting rotors on shafts
    • 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
    • F04D29/2205—Conventional flow pattern
    • F04D29/2222—Construction and assembly

Definitions

  • the present invention relates to an improved impeller suitable for use in a fluid pump.
  • the invention is used in a fluid pump having an electric motor. It will be hereinafter convenient to describe the invention in relation to this exemplary application, although it should be appreciated that the invention is not limited to that application and may be used as an impeller in a variety of different pump types and configurations.
  • Fluid pumps are suitable for pumping water to the jets of a spa-bath or spa-pool installation, or for meeting the requirements for pumping water for a swimming pool.
  • one form of fluid pump used in this application includes a housing assembly having a first sub-housing and having an electric motor therein, which is in line with a second sub-housing within which is provided an impeller.
  • a rotor shaft of the motor is connected to the impeller through a seal between the first and second sub-housings.
  • Existing fluid pumps typically include an impeller connected to the rotor shaft by way of a screw threaded arrangement.
  • the surface of one end of the rotor shaft is provided with a screw thread for mating with an internally threaded bore of the impeller.
  • This type of arrangement provides a generally suitable connection when the motor is operated as intended.
  • the impeller will tend to unthread from the rotor shaft.
  • the reverse direction of rotation can occur, for example, in incorrectly wired domestic applications supplied with three phase power.
  • One approach to addressing the problem of an impeller unthreading from a rotor shaft is to include an adhesive or bonding agent such as LOCTITE ® , to secure the threaded components together.
  • an adhesive or bonding agent such as LOCTITE ®
  • the adhesive must strong enough to prevent unintended unscrewing of the threaded components; while at the same time allow the components to be unscrewed, when necessary, to allow for servicing.
  • the use of such products generally adds to the overall time and cost of pump assembly.
  • such products must be carefully and sparingly applied to the specific components in question. It would be most undesirable for adhesive or a bonding agent to be applied, spilt or otherwise come into contact with other pump components.
  • adhesives and bonding agents generally only cope with the torsional stress of a limited number of motor starts before eventually failing. As a result, the use of such products for securing an impeller to a rotor shaft is generally not preferred.
  • pump motors are typically biased to run in one direction.
  • unintentional fluid flow in the reverse direction can be sufficient to impart rotation on the impeller overcoming the bias.
  • Another approach to minimizing the potential damage caused by a motor operating in reverse is to provide a check valve in the fluid flow path.
  • the provision of a check valve limits the flow of fluid through the impeller and, in turn, through the second sub-housing, to one desired direction.
  • the inclusion of a check valve adds to the overall cost and complexity of the pump.
  • a check valve, fitted to prevent reverse rotation of the impeller can cause water hammer. This can generate very high internal pressures within the pump and associated pipework. If a check valve is not fitted, these potentially damaging pressure build-ups cannot occur.
  • the present invention relates to an improved impeller for use in the above referred application. It is to be understood, however, that the invention could also be used in other applications.
  • an impeller suitable for use in a fluid pump, although the impeller may be used in other forms of pump.
  • the impeller includes first and second annular plates which are axially spaced.
  • the impeller also includes an angularly spaced array of vanes located between the plates, and a central hub connected to the first annular plate.
  • the hub is within and radially spaced from the inner periphery of the second annular plate; and by which the impeller is mountable on a shaft for rotation therewith.
  • the hub includes a shaft-receiving bore for receiving the shaft therein, the bore including a portion with a non-circular axial cross-section for providing a fit between the hub and the shaft that precludes axial rotation of the shaft relative to the hub.
  • the axial cross-section of the bore portion referred to above would typically be non-circular. However, this need not necessarily be the case, as a circular cross- section is also contemplated. In such an arrangement, an interference fit may, for example, be provided between the hub and shaft to prevent axial rotation of the shaft relative to the hub.
  • the hub is made of a suitable stiff material which has sufficient resilience to enable the hub and shaft to be secured together by a snap-fit therebetween.
  • the snap-fit arrangement is a releasable snap-fit, enabling the shaft and impeller to be secured together and released, as may be necessary for maintenance, repair or replacement of parts.
  • the hub may be connected to the first plate by one or more connectors extending between the first plate and an outer peripheral surface of the hub.
  • the impeller preferably includes a retainer to prevent disengagement of the hub relative to the shaft during use.
  • the retainer is receivable about the hub.
  • Axial displacement of the retainer relative to the hub may be prevented during use by way of a suitable engagement therebetween, or more preferably between the retainer and a sleeve.
  • the retainer may be in the form of an end cap mounted to an axial end of the hub, with a convex surface for assisting in the guiding of fluid through the impeller.
  • the convex surface may be part-spherical.
  • the retainer and sleeve are preferably made of suitable stiff material which has sufficient resilience to enable the retainer to be secured about the hub by a snap-fit arrangement between the retainer and sleeve.
  • this snap-fit arrangement is a releasable snap fit arrangement, enabling removal of the retainer from the hub and, in turn removal of the impeller from the shaft for maintenance, repair or replacement of parts.
  • the snap-fit arrangement may be provided by way of one or more hooks (or other suitable protrusions) provided on an outer surface of the sleeve, for engagement with an angled surface provided on an inner annular surface of the retainer.
  • the sleeve may be radially spaced from and extend about the hub.
  • the sleeve may be connected to the second plate by way of a plurality of connectors extending between an outer peripheral surface of the sleeve and the second plate.
  • An annular array of openings may be provided between an inner edge of the second plate and the sleeve and between successive connectors, enabling fluid to be pumped and be drawn through the space between the plates.
  • the first plate and the hub are preferably integrally formed as a single component part, and the second plate and sleeve may be integrally formed as another single component part, and with the vanes formed integrally with one of the plates.
  • the vanes provided between the plates may be formed integrally with either plate, and in one form are integrally formed with the first plate.
  • the hub and sleeve are preferably secured together by suitable engagement therebetween to prevent axial displacement between the hub and sleeve and; in turn, to prevent axial displacement between the first and second plates.
  • the hub and sleeve may be made of a suitable stiff material which has sufficient resilience to enable the hub and sleeve to be secured together by a snap-fit.
  • the hub and sleeve may be configured to be releasably snap-fitted together, although in a more preferred form the hub and sleeve are non-releasably snap-fitted together during impeller assembly.
  • the sleeve is provided with an annular shoulder provided about an inner surface thereof for engagement with one or more hooks provided about or connected to an annular outer surface of hub.
  • the hub is connected to the second plate and the sleeve is connected to the first plate.
  • the hub and second plate may be integrally formed as a single component part; and the sleeve and first plate may be integrally formed as another single component part.
  • the first plate is substantially flat, and the second plate has a generally frusto-conical portion.
  • the impeller may be made of any suitable material, and preferably a material that is moldable or castable. Suitable materials may include metal or a plastics material.
  • the vanes located between the plates may be arcuate, and outwardly extending in a spiral array.
  • the vanes are provided to enhance the velocity of fluid being pumped outwardly between the outer peripheries of the plates.
  • the impeller will initially impart an axial movement on the fluid moving between the plates followed by a radial movement of the fluid as the fluid moves towards and between the outer peripheries of the plates.
  • the present invention has, so far, been described in the context of an impeller, but it should be appreciated that the invention also resides in a fluid pump having an impeller of the above described form.
  • Figure 1 illustrates a sectional front view of an impeller according to one embodiment of the present invention.
  • Figure 2 illustrates a sectional side view of the impeller of Fig. 1.
  • Figure 3 is a perspective view of the impeller of Fig.1.
  • Figure 4 is a perspective exploded view of the impeller of Fig. 1.
  • Figure 5 is a perspective view of one end of a rotor shaft to which the impeller of Fig. 1 may be connected.
  • Figure 6 is a perspective view of an impeller according to another embodiment of the present invention.
  • Figure 7 is a sectional front view of the impeller of Fig. 6.
  • Figure 8 is a sectional top view of the impeller of Fig. 6.
  • Figure 9 is another sectional top view of the impeller of Fig. 6.
  • an impeller 10 according to one form of the present invention.
  • the impeller 10 forms part of a fluid pump (not illustrated).
  • the impeller 10 includes a first annular plate 12 and a second annular plate 14.
  • the first plate 12 is substantially flat, and the second plate 14 has a generally frusto- conical portion. It can be seen that the plates 12, 14 are axially spaced.
  • the inner periphery of the second plate 14 includes an annular skirt 15 which extends in an axial direction away from the first plate 12.
  • the skirt 15 defines an inlet guide for fluid being drawn through the impeller 10.
  • the skirt 15 initially imparts an axial movement A of fluid as it moves through the impeller 10.
  • An angularly spaced array of arcuate vanes 16 is provided, which are located between the plates 12, 14.
  • the plate 12 and the vanes 16 are integrally formed.
  • the vanes 16 define a spiral array.
  • the vanes 16 are provided to enhance the velocity of fluid being pumped outwardly between the outer peripheries of the plates 12, 14.
  • the vanes 16 guide a radial movement B of fluid as the fluid moves towards and between the outer peripheries of the plates 12, 14.
  • a central, annular hub 18 is connected to the first plate 12.
  • the hub has a closed end 19.
  • the first plate 12 and the hub 18 are integrally formed as a single component part, with the hub 18 being connected to the first plate 12 by two opposed (and integrally formed) connectors 20 (see Fig.
  • the hub 18 is within and radially spaced from the inner periphery 24 of the second plate 14.
  • the hub 18 includes a bore 26 for receiving a rotor shaft 28 (refer to Fig. 5) of an electric motor (not illustrated). Indeed, it is to be appreciated that the impeller 10 is mounted on and rotatable with the shaft 28. Although not illustrated, the lower end of the rotor shaft 28 would form part of and extend from the electric motor.
  • the rotor shaft 28 includes an axial end portion 30 generally defining what could be described as a key for receiving in a complementary receiving portion 32 of the bore 26.
  • the portion 30 of the shaft 28 and the portion 32 of the bore 26 provide a fit (such as a close fit) between the hub 18 and the shaft 28 that precludes axial rotation of the shaft 28 relative to the hub 18.
  • the rotor shaft 28 can be rotated in either direction R1 , R2 (see Fig. 5) without the possibility of the hub 18 (and hence the impeller 10) being unintentionally disconnected from the shaft 28, as can occur with existing arrangements.
  • the axial cross- section of the receiving portion 32 of the bore 26 is non-circular.
  • the end portion 30 of the shaft 28 includes a tapered end-section 31 to facilitate ease of assembly of the shaft 28 and hub 18.
  • the snap-fit 34 connection includes complementary first sloping surfaces 36 for snap-fit between the hub 18 and the shaft 28.
  • the snap-fit connection also includes complementary second sloping surfaces 38, thereby enabling the impeller 10 to be released from the shaft 28, as may be required during the operating life of the fluid pump.
  • the hub 18 is manufactured from a material having sufficient resilience to enable the hub 18 and shaft 28 to be snap- fitted together.
  • the impeller 10 includes a retainer 40 in the form of an end cap mounted to and receivable about the axial end 19 of the hub 18. The retainer 40 is provided for preventing disengagement of the hub 18 relative to the shaft 28 during use. Axial displacement of the retainer 40 relative to the hub 18 during use is prevented by way of a snap-fit 44 between the retainer 40 and a sleeve 50.
  • the retainer 40 and/or sleeve 50 are manufactured from of suitable stiff material which has sufficient resilience to facilitate the snap-fit therebetween.
  • This snap-fit arrangement is a releasable snap fit arrangement.
  • the snap-fit arrangement is provided by way of three radially spaced hooks 48 (or other suitable protrusions) mounted on arms 49 extending axially from the sleeve 50. The hooks are provided for engagement with an angled surface 52 provided on an inner annular surface 54 of the retainer 40.
  • the retainer 40 has a part-spherical surface 41 for assisting in the guiding of fluid into the impeller 10 between the retainer 40 and the edge 46 of the second plate 14.
  • Openings 42 are provided for receiving the end of a screw driver (or other suitable implement). This potentially assists in the release of the snap-fit between the retainer
  • the openings 42 allow the end of a screw driver to disengage the hooks
  • the retainer 40 must first be removed from the sleeve 50 before the impeller 10 can be removed from the shaft 28. With the retainer 40 removed, the sloping surfaces 36,38 are able to deflect radially outwardly, thereby enabling fitment of the impeller 10 to (and removal from) the shaft
  • the sleeve 50 is radially spaced from and extends about the hub 18.
  • the sleeve 50 is connected to the second plate 14 by way of a plurality of connectors 51 extending between an outer peripheral surface 55 of the sleeve 50 and the second plate 14.
  • An annular array of openings 56 is provided between the inner periphery 24 of the second plate 14 and the sleeve 50 and between successive connectors 51. This enables fluid to be pumped and be drawn through the space between the plates 12, 14.
  • the second plate 14, the sleeve 50 and connectors 51 are integrally formed as a single component part.
  • the hub 18 and sleeve 50 are secured together by a firm snap-fit. This prevents axial displacement between the hub 18 and sleeve 50 and, in turn, prevents axial displacement between the first and second plates 12, 14.
  • One or both of the hub 18 and sleeve 50 are manufactured from a suitable stiff material having sufficient resilience to enable the snap-fit.
  • the sleeve 50 is provided with an annular shoulder 57 provided about an inner surface thereof for engagement with two radially spaced shoulders (or hooks) 58 connected to and extending outwardly from the surface 22 of the hub 18.
  • the impeller is manufactured from a non-conductive material, for example a plastics material, such that the hub 18 provides an unbroken layer of insulation about the shaft 28. This is desirable because it ensures that a potential current path from the electric motor, via the shaft 28 to the water flowing through the impeller 10 isn't provided.
  • FIG. 6 A second possible form of the invention is illustrated in Figures 6 to 9. Many of the components illustrated in Figs 6 to 9 are identical or at least very similar to those illustrated in Figs 1 to 4 and are prefixed by the number "1 ". One notable difference between the two embodiments relates to that of the retainer 140, which has a second axial opening 141.
  • retainer 140 illustrated in Figure 6 is upside down in relation to its normal, in-use, orientation relative to the other components.
  • the orientation illustrated in Figure 5 can be used when it is desired to remove the hub 1 18 from the shaft 128 for service, repair or maintenance.
  • the upper end 142 of the hub 1 18 is sufficiently flexible such that pressing the upturned retainer 140 downwardly over the end of the hub 1 18 and shaft 128 causes the sloping surfaces 136, 138 of the hub 1 18 (providing the snap fit with the upper end 143 of the shaft 128) to disengage from undercuts 144 of the shaft 128. Once this occurs, the hub 1 18 and shaft 128 can then be relatively easily separated without the need to use a screwdriver or similar implement to prise the hub 1 18 and shaft 128 apart.
  • Figure 7 illustrates the retainer 140 in its in-use orientation relative to the other impeller components.
  • Figure 8 illustrates the in-use relationship between the hub 1 18, shaft 128 and retainer 140; while
  • Figure 9 illustrates the top end of the hub 1 18 being deformed outwardly when the upturned retainer 140 is forced downwardly upon the hub 1 18 and shaft 128. It can be seen in Figure 9 that the sloping surfaces 136, 138 are disengaged from the undercut 144, thereby allowing separation of the hub 1 18 and shaft 128.

Landscapes

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

Abstract

L'invention porte sur un rotor (10) approprié pour être utilisé dans une pompe à fluide, qui comprend une première et une deuxième plaques annulaires (12, 14) qui sont espacées axialement. Le rotor (10) comprend aussi une série d'aubes (16) espacées angulairement, placées entre les plaques (12, 14), et un moyeu central (18) relié à la première plaque annulaire (12). Le moyeu (18) est espacé radialement, contenu dans la périphérie intérieure (24) de la deuxième plaque annulaire (14) et espacé radialement de cette plaque, le rotor (10) pouvant être monté sur un arbre (28) par ce moyeu pour tourner avec celui-ci. Le moyeu (18) comprend un alésage (26) de réception de l'arbre destiné à recevoir intérieurement l'arbre (28). L'alésage (26) comprend une partie (30) qui présente une section axiale non circulaire de manière à établir un ajustement entre le moyeu (18) et l'arbre (28) qui exclut la rotation axiale de l'arbre (28) par rapport au moyeu (18).
PCT/AU2010/000772 2009-08-20 2010-06-21 Rotor de pompe perfectionné Ceased WO2011020136A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2009903926 2009-08-20
AU2009903926A AU2009903926A0 (en) 2009-08-20 Improved impeller

Publications (1)

Publication Number Publication Date
WO2011020136A1 true WO2011020136A1 (fr) 2011-02-24

Family

ID=43606461

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2010/000772 Ceased WO2011020136A1 (fr) 2009-08-20 2010-06-21 Rotor de pompe perfectionné

Country Status (1)

Country Link
WO (1) WO2011020136A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11014647B2 (en) * 2016-10-28 2021-05-25 SZ DJI Technology Co., Ltd. Locking mechanism, propeller, motor, propulsion system assembly, and aircraft
WO2025219127A1 (fr) * 2024-04-19 2025-10-23 Frideco Ag Dispositif de pompe, pompe et procédé de production d'un dispositif de pompe

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3779668A (en) * 1972-05-11 1973-12-18 Mcneil Corp Stage for a centrifugal pump
US4890982A (en) * 1988-06-20 1990-01-02 Richard Riback Pump impeller and rotor shaft attachment construction

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3779668A (en) * 1972-05-11 1973-12-18 Mcneil Corp Stage for a centrifugal pump
US4890982A (en) * 1988-06-20 1990-01-02 Richard Riback Pump impeller and rotor shaft attachment construction

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11014647B2 (en) * 2016-10-28 2021-05-25 SZ DJI Technology Co., Ltd. Locking mechanism, propeller, motor, propulsion system assembly, and aircraft
WO2025219127A1 (fr) * 2024-04-19 2025-10-23 Frideco Ag Dispositif de pompe, pompe et procédé de production d'un dispositif de pompe

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