EP1085212B1 - High-pressure centrifugal pump - Google Patents
High-pressure centrifugal pump Download PDFInfo
- Publication number
- EP1085212B1 EP1085212B1 EP00850140A EP00850140A EP1085212B1 EP 1085212 B1 EP1085212 B1 EP 1085212B1 EP 00850140 A EP00850140 A EP 00850140A EP 00850140 A EP00850140 A EP 00850140A EP 1085212 B1 EP1085212 B1 EP 1085212B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure
- pump
- vanes
- inlet
- pressure step
- 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 - Lifetime
Links
Images
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
- F04D29/22—Rotors specially for centrifugal pumps
- F04D29/2205—Conventional flow pattern
- F04D29/2211—More than one set of flow passages
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D1/06—Multi-stage 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
- F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D17/08—Centrifugal pumps
- F04D17/10—Centrifugal pumps for compressing or evacuating
- F04D17/12—Multi-stage pumps
Definitions
- the invention concerns a high-pressure machine, namely a pump for liquids or a compressor for obtaining a media transport under high pressure as specified in the preamble of claim 1.
- a pump or compressor is known from e.g. CH-A-93071 or DE-A-2115330.
- a pump of the centrifugal type When pumping liquids to high levels where consequently a high pressure is needed, a pump of the centrifugal type is to prefer.
- a pump comprises a pump impeller on a rotating shaft, said impeller being designed with a hub and a circular disc provided with one or several impeller vanes.
- the liquid enters in an axial direction in the center and leaves the impeller at the periphery.
- a pump housing surrounding the impeller transforms the kinetic energy to pressure energy which obtains the transport to a higher level.
- the purpose of the invention is thus to obtain a pump or a compressor having more than two pressure steps having a very high efficiency thanks to the fact that the disc losses are minimized.
- the device according to the invention is also characterized in that the design is very compact, easy to mount and being possible to adapt with regard to axial force and seal pressure.
- Fig 1 shows a an axial cut through a pump according to the invention
- Fig 2 shows the cut according to Fig 1 inserted in a view over a submersible pump.
- FIG. 1 stands for a rotary shaft
- 2 a pump impeller hub having a disc 3.
- 4, 5, 6 and 7 stand for impeller vanes
- 8 and 9 cover discs and 10 a part of a pump housing comprising walls 11 and 12 opposing the impeller 13, 14, 15, 16 and 17 symbolize seals
- 18, 19 stand for inlets to the pressure steps.
- 22, 23, 24 and 25 stand for diffusors in the pump steps.
- 26, 27 and 28 stand for flow conduits, 29 and 30 inlet and outlet respectively for the pump and 31 finally, a motor unit.
- the high-pressure pump comprises a pump housing 10 within which a rotating hub 2 with a connected disc 3 is arranged.
- the disc 3 is on each side provided with vanes 5 and 6 respectively, each group of vanes being provided with a cover disc 8 and 9 respectively and creating a double-sided closed pump impeller.
- the cover discs 8 and 9 are on their respective opposite sides provided with additional vanes which form another double sided pump impeller together with the pump housing walls 11 and 12 respectively. In this way a four-step pump impeller is created having two closed and two open channels.
- the pump operates in the following way: the liquid is sucked in through the inlet 29 and flows to the inlet 18 of the first pressure step.
- This step is formed by the vanes 4, the cover disc 8 and the pump housing wall 11.
- a flow conduit 26 goes from the diffusor 22 of said first pressure step to the inlet 19 of a second pressure step, said second step being formed by the vanes 5, the underside of the hub disc 3 and the cover disc 8.
- a second flow conduit 27 goes from the diffusor 23 of said second pressure step to the inlet 20 of a third pressure step, said third step being formed by the vanes 6, the upside of the hub disc 3 and the cover disc 9.
- a third flow conduit 28 goes from the diffusor 24 of said third pressure step to the inlet 21 of a fourth pressure step, said fourth step being formed by the vanes 7, the cover disc 9 and the pump housing wall 12. Finally the liquid leaves the pump via the diffusor 25 of the fourth pressure step through the inlet 30.
- the pump according to the invention provides a number of advantages when compared with conventional high-pressure pumps having one or several pressure steps.
- the efficiency is very high thanks to the fact that several pressure steps bring about a more favorable specific rotation speed and that the disc losses are reduced considerably.
- the mounting of the pump is much simpler in a comparison with mounting of conventional multi-step pumps.
- trimming of the very compact pump means possibilities to reduce axial forces as well as seal pressures thanks to the symmetrical design.
- the invention is not limited to pumps for liquids, but is also possible to apply for pressurizing of gaseous media.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Description
- The invention concerns a high-pressure machine, namely a pump for liquids or a compressor for obtaining a media transport under high pressure as specified in the preamble of
claim 1. Such a pump or compressor is known from e.g. CH-A-93071 or DE-A-2115330. - In the following is referred to pumps for liquids, but the invention is also applicable in machines for transport of gaseous media.
- When pumping liquids to high levels where consequently a high pressure is needed, a pump of the centrifugal type is to prefer. Such a pump comprises a pump impeller on a rotating shaft, said impeller being designed with a hub and a circular disc provided with one or several impeller vanes. The liquid enters in an axial direction in the center and leaves the impeller at the periphery. A pump housing surrounding the impeller, transforms the kinetic energy to pressure energy which obtains the transport to a higher level.
- At higher heads it is common to use pumps with high rotation speeds and relatively small diameters. It is also possible to connect a number of pumps in series by connecting the outlet from a first step to the inlet in a second step and so on. An example is shown in EP-A-355781, where five steps are connected in series.
- When a certain operation point at a certain rotation speed is chosen, it can be an advantage to use several steps, as the pump impellers can operate at rotation speeds which are superior with regard to efficiency. This increase of efficiency is mainly related to the fact that the friction losses at the back sides of the impeller hubs, as a part of the total losses, decrease. On the other hand the linking losses between the steps are added. One disadvantage is further, that the relatively complicated design means that service and maintenance become complicated and in addition long shafts bring about increased mechanical stress.
- Another way to obtain high pump heads is to connect two identical pressure steps in series as is shown in US-A-958 765 and DE-353 698. The pump impellers are here arranged mirror-inverted, but have in other respects conventional designs. US-A-2 136 939 discloses a pump with two pressure steps having a common hub disc, thereby obtaining a reduction of the disc losses. This solution, as well as the one previously mentioned, have in common that the principle only allows two pressure steps, which is not always sufficient for obtaining the desired pump head.
- The purpose of the invention is thus to obtain a pump or a compressor having more than two pressure steps having a very high efficiency thanks to the fact that the disc losses are minimized. The device according to the invention is also characterized in that the design is very compact, easy to mount and being possible to adapt with regard to axial force and seal pressure.
- The invention is disclosed below with reference to the enclosed drawings. Fig 1 shows a an axial cut through a pump according to the invention, while Fig 2 shows the cut according to Fig 1 inserted in a view over a submersible pump.
- In the
drawings 1 stands for a rotary shaft, 2 a pump impeller hub having adisc 3. 4, 5, 6 and 7 stand for impeller vanes, 8 and 9 cover discs and 10 a part of a pumphousing comprising walls 11 and 12 opposing theimpeller - According to the invention the high-pressure pump comprises a
pump housing 10 within which a rotatinghub 2 with a connecteddisc 3 is arranged. Thedisc 3 is on each side provided withvanes 5 and 6 respectively, each group of vanes being provided with a cover disc 8 and 9 respectively and creating a double-sided closed pump impeller. The cover discs 8 and 9 are on their respective opposite sides provided with additional vanes which form another double sided pump impeller together with thepump housing walls 11 and 12 respectively. In this way a four-step pump impeller is created having two closed and two open channels. - The pump operates in the following way: the liquid is sucked in through the
inlet 29 and flows to theinlet 18 of the first pressure step. This step is formed by the vanes 4, the cover disc 8 and thepump housing wall 11. Aflow conduit 26 goes from thediffusor 22 of said first pressure step to theinlet 19 of a second pressure step, said second step being formed by the vanes 5, the underside of thehub disc 3 and the cover disc 8. Asecond flow conduit 27 goes from thediffusor 23 of said second pressure step to theinlet 20 of a third pressure step, said third step being formed by thevanes 6, the upside of thehub disc 3 and the cover disc 9. Athird flow conduit 28 goes from thediffusor 24 of said third pressure step to theinlet 21 of a fourth pressure step, said fourth step being formed by the vanes 7, the cover disc 9 and the pump housing wall 12. Finally the liquid leaves the pump via thediffusor 25 of the fourth pressure step through theinlet 30. - The pump according to the invention provides a number of advantages when compared with conventional high-pressure pumps having one or several pressure steps.
- The efficiency is very high thanks to the fact that several pressure steps bring about a more favorable specific rotation speed and that the disc losses are reduced considerably.
- The mounting of the pump is much simpler in a comparison with mounting of conventional multi-step pumps. In addition, trimming of the very compact pump means possibilities to reduce axial forces as well as seal pressures thanks to the symmetrical design.
- In the embodiment of the invention that is described above, the importance of minimizing the pressure difference between two adjacent pressure steps has been stressed. If it is more important to minimize the axial forces, another order between the steps might be to prefer. The scope of the invention also includes an embodiment where all channels in the impeller are closed.
- As previously mentioned, the invention is not limited to pumps for liquids, but is also possible to apply for pressurizing of gaseous media.
- Within the scope of the invention there is also a possibility to increase the number of pressure steps by providing the outer vanes 4 and 7 with cover discs. Said discs may in their turn be provided with additional vanes which form additional pressure steps in cooperation with additional pump housing walls and so on, the different pressure steps being connected via single or multiple flow conduits.
Claims (1)
- A pump or a compressor of centrifugal type for providing high pressures, comprising a rotary shaft (1), a motor (31) connected to the shaft (1), an impeller connected to the shaft (1) and surrounded by a housing 10), said impeller comprises a circular disc (3) connected to a hub (2),
a first set of two or more vanes (5, 6) provided on each side of said circular disc (3);
cover discs (8, 9) provided on the edges of said first set of vanes (5, 6); and
a second set of two or more vanes (4, 7) provided on the outwardly directed sides of the cover discs, where two pressure steps are formed by the first set of vanes (5, 6), each side of the circular disc, and the cover discs (8, 9), and an additional two pressure steps are formed by the second set of vanes (4, 7), the cover discs (8, 9), and a set of pump housing walls located adjacently to the second set of vanes (4, 7), with a single or multiple flow conduits (26, 27, 28) arranged between an outlet (22) of a first pressure step and an inlet (19) of a second pressure step, between an outlet (23) of said second pressure step and an inlet (20) of a third pressure step and between outlet (24) of said third pressure step and an inlet (21) of the fourth pressure step, characterized in that a last pressure step, which has a highest output pressure, is arranged closer to said motor (31) than any other pressure step and is connected with an outlet (30), which is located on the same side of the pump or compressor as an inlet (29) and faces in the same direction as said inlet (29).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9903278A SE521399C2 (en) | 1999-09-15 | 1999-09-15 | Rotodynamic high pressure machine |
SE9903278 | 1999-09-15 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1085212A2 EP1085212A2 (en) | 2001-03-21 |
EP1085212A3 EP1085212A3 (en) | 2002-05-29 |
EP1085212B1 true EP1085212B1 (en) | 2006-03-08 |
Family
ID=20416981
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00850140A Expired - Lifetime EP1085212B1 (en) | 1999-09-15 | 2000-08-23 | High-pressure centrifugal pump |
Country Status (11)
Country | Link |
---|---|
EP (1) | EP1085212B1 (en) |
JP (1) | JP2001099091A (en) |
AR (1) | AR026878A1 (en) |
AT (1) | ATE319934T1 (en) |
AU (1) | AU762289B2 (en) |
BR (1) | BR0004211A (en) |
CA (1) | CA2319607C (en) |
DE (1) | DE60026490T2 (en) |
MX (1) | MXPA00008931A (en) |
SE (1) | SE521399C2 (en) |
ZA (1) | ZA200004443B (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB0916901D0 (en) * | 2009-09-25 | 2009-11-11 | Dynamic Boosting Systems Ltd | Diffuser |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE155337C (en) * | ||||
CH93071A (en) * | 1918-11-01 | 1922-02-16 | Johnston Frame William | Further development in ventilators and multistage centrifugal pumps. |
DE345856C (en) * | 1920-02-20 | 1921-12-17 | Bbc Brown Boveri & Cie | Centrifugal machine for compressing and conveying gases or liquids with several stages connected in series |
CH252609A (en) * | 1945-01-13 | 1948-01-15 | Sulzer Ag | Multi-stage compressor. |
US3102680A (en) * | 1961-06-27 | 1963-09-03 | Sam F Fogleman | Multistage centrifugal gas compressor |
DE2115330A1 (en) * | 1971-03-30 | 1972-10-19 | Demag Ag | Multi-stage compressor of radial or semi-radial design |
-
1999
- 1999-09-15 SE SE9903278A patent/SE521399C2/en not_active IP Right Cessation
-
2000
- 2000-08-21 ZA ZA200004443A patent/ZA200004443B/en unknown
- 2000-08-23 EP EP00850140A patent/EP1085212B1/en not_active Expired - Lifetime
- 2000-08-23 DE DE60026490T patent/DE60026490T2/en not_active Expired - Fee Related
- 2000-08-23 AT AT00850140T patent/ATE319934T1/en not_active IP Right Cessation
- 2000-09-07 AR ARP000104695A patent/AR026878A1/en not_active Application Discontinuation
- 2000-09-12 MX MXPA00008931A patent/MXPA00008931A/en unknown
- 2000-09-13 AU AU59418/00A patent/AU762289B2/en not_active Ceased
- 2000-09-14 JP JP2000279423A patent/JP2001099091A/en active Pending
- 2000-09-14 CA CA002319607A patent/CA2319607C/en not_active Expired - Fee Related
- 2000-09-15 BR BR0004211-0A patent/BR0004211A/en unknown
Also Published As
Publication number | Publication date |
---|---|
MXPA00008931A (en) | 2004-10-15 |
AU5941800A (en) | 2001-03-22 |
BR0004211A (en) | 2001-04-10 |
AU762289B2 (en) | 2003-06-19 |
SE9903278D0 (en) | 1999-09-15 |
EP1085212A3 (en) | 2002-05-29 |
DE60026490T2 (en) | 2006-10-12 |
AR026878A1 (en) | 2003-03-05 |
SE521399C2 (en) | 2003-10-28 |
CA2319607A1 (en) | 2001-03-15 |
EP1085212A2 (en) | 2001-03-21 |
SE9903278L (en) | 2001-03-16 |
ATE319934T1 (en) | 2006-03-15 |
ZA200004443B (en) | 2001-05-22 |
CA2319607C (en) | 2003-11-04 |
JP2001099091A (en) | 2001-04-10 |
DE60026490D1 (en) | 2006-05-04 |
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