WO1999064748A1 - An accessory for a fluid displacement machine - Google Patents

An accessory for a fluid displacement machine Download PDF

Info

Publication number
WO1999064748A1
WO1999064748A1 PCT/IB1999/000802 IB9900802W WO9964748A1 WO 1999064748 A1 WO1999064748 A1 WO 1999064748A1 IB 9900802 W IB9900802 W IB 9900802W WO 9964748 A1 WO9964748 A1 WO 9964748A1
Authority
WO
WIPO (PCT)
Prior art keywords
impeller
accessory
fluid
displacement machine
fluid displacement
Prior art date
Application number
PCT/IB1999/000802
Other languages
French (fr)
Inventor
Johan Hendrik Du Plessis
Original Assignee
Johan Hendrik Du Plessis
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 Johan Hendrik Du Plessis filed Critical Johan Hendrik Du Plessis
Priority to AU37238/99A priority Critical patent/AU3723899A/en
Publication of WO1999064748A1 publication Critical patent/WO1999064748A1/en

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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/445—Fluid-guiding means, e.g. diffusers especially adapted for liquid pumps
    • F04D29/447—Fluid-guiding means, e.g. diffusers especially adapted for liquid pumps rotating diffusers
    • 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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/4213—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps suction ports
    • 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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/441—Fluid-guiding means, e.g. diffusers especially adapted for elastic fluid pumps
    • F04D29/442—Fluid-guiding means, e.g. diffusers especially adapted for elastic fluid pumps rotating diffusers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2250/00—Geometry
    • F05D2250/50—Inlet or outlet
    • F05D2250/51—Inlet

Definitions

  • THIS INVENTION relates to a fluid displacement machine
  • the accessory comprising a
  • the accessory may include a first free rotating mounting device for
  • free rotating mounting device includes a
  • apparatus is rotatable independently with reference to the rotatable shaft.
  • the term "impeller” includes any apparatus which drives,
  • the free rotating mounting device preferably includes a bearing
  • the secondary impeller features
  • a substantially conical body having a leading edge and a base with a plurality of
  • vanes mounted on the body.
  • the vanes may extend from the leading edge to the base of the body
  • vanes include leading edges
  • the secondary impeller includes a second
  • the second free rotating mounting device is preferably mountable to
  • the first free rotating mounting device may be mountable to the base
  • the secondary impeller is of the body of the secondary impeller.
  • the secondary impeller is of the body of the secondary impeller.
  • the first free rotating mounting device may be mounted to the hub of
  • the secondary impeller is
  • the vanes of the secondary impeller may be configured to cause the
  • vanes of the secondary impeller may be configured
  • the fluid displacement machine may be any one of an axial flow fan,
  • the machine including a secondary impeller as
  • Figure 1 is an isometric view of one embodiment of a secondary
  • Figure 2 is an isometric view of the impeller of figure 1 mounted in
  • Figure 3 is a front view of the impeller of figure 1 ;
  • Figure 4 is a sectioned side view of the impeller of figures 1 and 2 mounted in association with a fluid displacement machine; and
  • Figure 5 is a sectioned side view of a second embodiment of a
  • secondary impeller 1 0 according to the invention is shown to comprise a conical
  • vanes 1 8 are mounted to the body 1 2 and describe arcuate paths
  • leading edge 1 8.1 which extends transversely relative to the rotational
  • Base 1 6 features mounting holes 22 for mounting a free rotating
  • Machine 26 shown to be mounted to the drive shaft 24 of a fluid displacement machine 26 (in this embodiment, a centrifugal fan) .
  • Machine 26 include an impeller 28 (the primary
  • the secondary impeller is
  • Secondary impeller 10 is mounted to shaft 24 by way of a free
  • Device 34 comprises a bearing assembly 36 which
  • the primary impeller 28 rotates and draws fluid, in this case
  • air into the fluid inlet area 32 in direction A.
  • the air causes the
  • Rotation of the secondary impeller 1 0 causes the intake air to be guided radially in
  • fluid displacement machine in this embodiment, an axial flow fan.
  • impeller 47 (the primary impeller) .
  • vanes 50 extend radially from the hub 44 as shown in the
  • Device 46 comprises a bearing assembly 52 and allows the secondary impeller 42 to be mounted to shaft 48 in a free rotating fashion.
  • impeller 42 is mounted in a fluid inlet area 54 of the fluid displacement machine as
  • air to be drawn into the fluid inlet area 54 in direction A.
  • secondary impeller 42 guides the inlet air in direction B onto the primary impeller.

Landscapes

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

Abstract

An accessory for use with a fluid displacement machine (26) having a casing (30), an impeller (28), an impeller drive shaft (24) and a fluid intake area (32) is disclosed. The accessory comprises a secondary impeller (10) mountable for free rotation in the fluid intake area (32). A fluid displacement machine (26) including an accessory therefor and a method of guiding fluid onto the impeller (28) of a fluid displacement machine (26) is furthermore disclosed.

Description

AN ACCESSORY FOR A FLUID DISPLACEMENT MACHINE
THIS INVENTION relates to a fluid displacement machine, an
accessory therefor and a method of guiding intake fluid onto an impeller of the fluid
displacement machine.
According to a first aspect of the invention, there is provided an
accessory for use with a fluid displacement machine having a casing, an impeller,,
an impeller drive shaft and a fluid intake area, the accessory comprising a
secondary impeller mountable for free rotation in the proximity of the fluid intake
area.
The accessory may include a first free rotating mounting device for
mounting on the drive shaft.
In this specification and in the appended claims, unless the context
clearly indicates otherwise, the term "free rotating mounting device " includes a
device for mounting an apparatus to a rotatable shaft in such a way that the
apparatus is rotatable independently with reference to the rotatable shaft.
Furthermore, the term "impeller" includes any apparatus which drives,
forces or displaces a fluid and includes, but is not limited to an impeller for a pump,
fan and the like, a propeller, a runner and a rotor. The free rotating mounting device preferably includes a bearing
arrangement for mounting to the drive shaft.
In a preferred form of the invention, the secondary impeller features
a substantially conical body having a leading edge and a base with a plurality of
vanes mounted on the body.
The vanes may extend from the leading edge to the base of the body
describing an arcuate path.
In a preferred form of the invention the vanes include leading edges
which are orientated transverse with reference to the rotational axis of the
secondary impeller.
In one form of the invention, the secondary impeller includes a second
free rotating mounting device for mounting on the casing of a fluid displacement
machine.
The second free rotating mounting device is preferably mountable to
the leading edge of the impeller body.
The first free rotating mounting device may be mountable to the base
of the body of the secondary impeller. In an alternative form of the invention, the secondary impeller
comprises a central hub and a plurality of vanes extending radially from the hub.
The first free rotating mounting device may be mounted to the hub of
the secondary impeller.
In a preferred form of the invention, the secondary impeller is
mountable in the proximity of the fluid inlet area of the fluid displacement machine.
With the above arrangement, rotation of the fluid displacement
machine's impeller (the primary impeller), causes fluid to enter the machine via the
fluid inlet area which fluid in turn causes the secondary impeller to rotate.
The vanes of the secondary impeller may be configured to cause the
secondary impeller to rotate in the same direction as the impeller of the fluid
displacement machine in use.
Alternatively, the vanes of the secondary impeller may be configured
to cause the secondary impeller to rotate in the opposite direction to the impeller
of the fluid displacement machine in use.
The fluid displacement machine may be any one of an axial flow fan,
a centrifugal fan, a pump, a compressor and a turbine. According to a second aspect of the invention, a fluid displacement
machine which includes a casing, an impeller, a drive shaft for the impeller and a
fluid intake area is provided, the machine including a secondary impeller as
described above which is mounted for free rotation in the proximity of the fluid
intake area.
According to a third aspect of the invention, a method of guiding
intake fluid onto an impeller of a fluid displacement machine including a casing, an
impeller, a drive shaft for the impeller and a fluid intake area comprises the step of
mounting a free rotating secondary impeller as described above in association with
the impeller of the machine
This invention will now be described in more detail with reference to
the accompanying drawings, in which:
Figure 1 is an isometric view of one embodiment of a secondary
impeller according to the invention;
Figure 2 is an isometric view of the impeller of figure 1 mounted in
association with the impeller of a fluid displacement machine;
Figure 3 is a front view of the impeller of figure 1 ; Figure 4 is a sectioned side view of the impeller of figures 1 and 2 mounted in association with a fluid displacement machine; and
Figure 5 is a sectioned side view of a second embodiment of a
secondary impeller according to the invention, mounted in association with a fluid
displacement machine.
Referring now in particular to figures 1 , 2 and 3, a
secondary impeller 1 0 according to the invention is shown to comprise a conical
body 1 2 having a leading edge 14 and a circular, flanged base 1 6.
Four vanes 1 8 are mounted to the body 1 2 and describe arcuate paths
from the leading edge 14 of the body to the base 1 6 as shown. Each vane 1 8
features a leading edge 1 8.1 which extends transversely relative to the rotational
axis 20 of the impeller 10.
It will be appreciated that the number of vanes and the vane shapes will affect the
performance of the impeller.
Base 1 6 features mounting holes 22 for mounting a free rotating
mounting device to, as will be described hereunder.
In figure 4, a secondary impeller 10 according to the invention is
shown to be mounted to the drive shaft 24 of a fluid displacement machine 26 (in this embodiment, a centrifugal fan) . Machine 26 include an impeller 28 (the primary
impeller) and a casing 30 including a fluid inlet area 32. The secondary impeller is
shown to be mounted in the fluid inlet area 32 of the machine 26.
Secondary impeller 10 is mounted to shaft 24 by way of a free
rotating mounting device 34. Device 34 comprises a bearing assembly 36 which
is mounted in a free rotating fashion to shaft 24 and a mount plate 38 which is
mounted to the flanged base 1 6 of the secondary impeller body 1 2 by way of bolts
40.
In use, the primary impeller 28 rotates and draws fluid, in this
embodiment, air, into the fluid inlet area 32 in direction A. The air causes the
secondary impeller 10 to rotate in the same direction as the primary impeller 28.
Rotation of the secondary impeller 1 0 causes the intake air to be guided radially in
direction B onto the primary impeller 28.
In figure 5, an alternative embodiment of a secondary impeller 42
according to the invention is shown to comprise a central hub 44 which is
mounted by way of a free rotating mounting device 46 to the drive shaft 48 of a
fluid displacement machine (in this embodiment, an axial flow fan). The machine
includes an impeller 47 (the primary impeller) .
Four vanes 50 extend radially from the hub 44 as shown in the
drawing. Device 46 comprises a bearing assembly 52 and allows the secondary impeller 42 to be mounted to shaft 48 in a free rotating fashion. Secondary
impeller 42 is mounted in a fluid inlet area 54 of the fluid displacement machine as
shown.
In use, rotation of the primary impeller 47 causes fluid, in this
embodiment, air, to be drawn into the fluid inlet area 54 in direction A. The
secondary impeller 42 guides the inlet air in direction B onto the primary impeller.
Applicant has found that the operation of a secondary impeller as
described with reference to figures 1 , 2 and 3, when mounted to a centrifugal fan,
has improved the efficiency of the fan significantly in terms of increased volume
displacement and pressure. Tests indicated an increase in efficiency of a centrifugal
air fan from 68% standard, i.e. not fitted with the secondary impeller as described
to 85% when fitted with the secondary impeller as described.

Claims

1 . An accessory for use with a fluid displacement machine having a
casing, an impeller, an impeller drive shaft and a fluid intake area, the accessory
comprising a secondary impeller mountable for free rotation in the proximity of the
fluid intake area.
2. An accessory as claimed in claim 1 having a first free rotating
mounting device for mounting to the drive shaft.
3. An accessory as claimed in claims 1 or 2 wherein the free rotating
mounting device includes a bearing arrangement for mounting to the drive shaft.
4. An accessory as claimed in any one of claims 1 to 3 wherein the
secondary impeller includes a substantially conical body having a leading edge and
a base with a plurality of vanes mounted on the body.
5. An accessory as claimed in any one of claims 1 to 4 wherein the
vanes extend from the leading edge to the base of the body, describing an arcuate
path.
6. An accessory as claimed in any one of claims 1 to 5 wherein the
vanes include leading edges which are orientated transversely with reference to the
rotational axis of the secondary impeller.
7. An accessory claimed in any one of claims 1 to 6 including a second
free rotating mounting device for mounting to the casing of the fluid displacement
machine.
8. An accessory as claimed in claim 7 wherein the second free rotating
mounting device is mountable to the leading edge of the impeller body.
9. An accessory as claimed in any one of claims 1 to 8 wherein the first
free rotating mounting device is mounted to the base of the body of the secondary
impeller.
10. An accessory as claimed in any one of claims 1 to 3 including a
central hub and a plurality of vanes extending radially therefrom.
1 1 . An accessory as claimed in claim 1 0 wherein the first free rotating
mounting device is mounted to the hub of the secondary impeller.
1 2. An accessory as claimed in any one of claims 4 to 1 1 wherein the
vanes are configured to cause the secondary impeller to rotate in the same
direction as the impeller of the fluid displacement machine.
1 3. An accessory as claimed in any one of claims 4 to 1 1 wherein the
vanes are configured to cause the secondary impeller to rotate in the opposite direction to the impeller of the fluid displacement machine.
14. An accessory as claimed in any one of claims 1 to 1 3 wherein the
fluid displacement machine comprises any one of: an axial flow fan, a centrifugal
fan, a pump a compressor and a turbine.
1 5. A fluid displacement machine which includes a casing, an impeller, a
drive shaft for the impeller and a fluid intake area, the machine including a
secondary impeller which is mountable for free rotation in the fluid intake area.
16. A method of guiding intake fluid onto an impeller of a fluid
displacement machine including a casing, an impeller, a drive shaft for the impeller
and a fluid intake area, the method comprising the step of mounting a free rotating
secondary impeller in the proximity of the fluid intake area.
1 7. An accessory substantially as herein described with reference to the
accompanying drawings.
1 8. A fluid displacement machine substantially as herein described with
reference to the accompanying drawings.
1 9. A method of guiding fluid onto an impeller of a fluid displacement
machine substantially as herein described with reference to the accompanying
drawings.
PCT/IB1999/000802 1998-06-02 1999-05-04 An accessory for a fluid displacement machine WO1999064748A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU37238/99A AU3723899A (en) 1998-06-02 1999-05-04 An accessory for a fluid displacement machine

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA98945 1998-06-02
ZA98/0945 1998-06-02

Publications (1)

Publication Number Publication Date
WO1999064748A1 true WO1999064748A1 (en) 1999-12-16

Family

ID=25586847

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB1999/000802 WO1999064748A1 (en) 1998-06-02 1999-05-04 An accessory for a fluid displacement machine

Country Status (2)

Country Link
AU (1) AU3723899A (en)
WO (1) WO1999064748A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102128174A (en) * 2011-04-02 2011-07-20 山东大学 Spiral-flow type blockage-free energy-efficient centrifugal fan
CN102588345A (en) * 2011-01-05 2012-07-18 南阳汉冶特钢有限公司 Axial progressive accelerating pressurizing flow collector

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE232348C (en) *
DE564826C (en) * 1932-11-23 Siemens Schuckertwerke Akt Ges Device for conveying gases or liquids with a helical gear in the inlet channel of a centrifugal motor and a diffuser connected between the helical and centrifugal motor and flowed through from the inside to the outside
US2555312A (en) * 1947-01-24 1951-06-05 Bollay William Supercharger
US3918828A (en) * 1974-09-05 1975-11-11 Emerson L Kumm Flow control for compressors and pumps
JPS58131399A (en) * 1982-01-29 1983-08-05 Yoshio Sato Method for eliminating collision loss in fluidic machine
GB2182098A (en) * 1985-10-30 1987-05-07 Neu Ets Turbo machines having power regulation
EP0887557A1 (en) * 1997-06-23 1998-12-30 Carrier Corporation Free rotor stabilization

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE232348C (en) *
DE564826C (en) * 1932-11-23 Siemens Schuckertwerke Akt Ges Device for conveying gases or liquids with a helical gear in the inlet channel of a centrifugal motor and a diffuser connected between the helical and centrifugal motor and flowed through from the inside to the outside
US2555312A (en) * 1947-01-24 1951-06-05 Bollay William Supercharger
US3918828A (en) * 1974-09-05 1975-11-11 Emerson L Kumm Flow control for compressors and pumps
JPS58131399A (en) * 1982-01-29 1983-08-05 Yoshio Sato Method for eliminating collision loss in fluidic machine
GB2182098A (en) * 1985-10-30 1987-05-07 Neu Ets Turbo machines having power regulation
EP0887557A1 (en) * 1997-06-23 1998-12-30 Carrier Corporation Free rotor stabilization

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 7, no. 244 (M - 252)<1389> 28 October 1983 (1983-10-28) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102588345A (en) * 2011-01-05 2012-07-18 南阳汉冶特钢有限公司 Axial progressive accelerating pressurizing flow collector
CN102128174A (en) * 2011-04-02 2011-07-20 山东大学 Spiral-flow type blockage-free energy-efficient centrifugal fan

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Publication number Publication date
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