EP1979621A1 - Magnetically coupled centrifugal pump for corrosive media - Google Patents
Magnetically coupled centrifugal pump for corrosive mediaInfo
- Publication number
- EP1979621A1 EP1979621A1 EP08715923A EP08715923A EP1979621A1 EP 1979621 A1 EP1979621 A1 EP 1979621A1 EP 08715923 A EP08715923 A EP 08715923A EP 08715923 A EP08715923 A EP 08715923A EP 1979621 A1 EP1979621 A1 EP 1979621A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- centrifugal pump
- pump according
- hub
- bearings
- 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.)
- Granted
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
- F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
- F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
- F04D7/06—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being hot or corrosive, e.g. liquid metals
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/021—Units comprising pumps and their driving means containing a coupling
- F04D13/024—Units comprising pumps and their driving means containing a coupling a magnetic coupling
- F04D13/026—Details of the bearings
-
- 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
- F04D29/04—Shafts or bearings, or assemblies thereof
- F04D29/046—Bearings
- F04D29/0465—Ceramic bearing designs
-
- 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
- F04D29/04—Shafts or bearings, or assemblies thereof
- F04D29/046—Bearings
- F04D29/049—Roller bearings
Definitions
- the invention relates to a magnetically coupled centrifugal pump for pumping a fluiu medium with a housing in which a split pot, which has a bottom, a jacket and a clamped between two parts of the housing flange, a flowed through by the medium pump chamber of a at its periphery Permanent magnet bearing rotor separates, which is driven by a motor.
- a split pot which has a bottom, a jacket and a clamped between two parts of the housing flange
- a flowed through by the medium pump chamber of a at its periphery Permanent magnet bearing rotor separates, which is driven by a motor.
- In the pump chamber opens a suction and for the outlet of the medium is an out of the pump room leading outlet exists.
- an impeller is arranged, which is rotatably connected to a hub which is mounted on an axle and carries permanent magnets, which are opposite to the permanent magnets of the driving rotor.
- the hub is arranged with its permanent magnets in the containment shell, which has a cylindrical or nearly cylindrical shell.
- An impeller is arranged outside the containment shell in the pump room.
- a centrifugal pump designed as a centrifugal pump is the medium by an axially arranged by rotation of the impeller Aspirated suction and conveyed out through a radially arranged outlet opening from the pump room.
- the medium is sucked in by rotation of the impeller through a radially arranged suction opening and conveyed out of the pump space through a radially arranged outlet opening.
- the inlet opening and the outlet opening are not opposite each other diagonally;
- a pumping channel extends beyond its larger spacing, taken in the circumferential direction of the impeller, whereas otherwise a barrier is provided between the inlet opening and the outlet opening.
- the impeller is driven indirectly by an electric motor, which is mechanically connected to the driving rotor, which at least partially surrounds the jacket of the split pot and carries the permanent magnets, which by magnetic coupling with the permanent magnets of the impeller rotational movement of the driving rotor on the Transferred impeller.
- the magnetically coupled drive makes it possible to pump corrosive and aggressive media with the centrifugal pump without endangering the drive unit because it is hermetically separated from the pump chamber by the stationary containment shell.
- the surfaces in contact with the medium in the pump room are not metallic, but are made of a plastic such as plastic.
- Polypropylene PP
- PVDF polyvinylidene fluoride
- PPS polyphenylene sulfide
- PEEK polyetheretherketone
- PTFE polytetrafluoroethylene
- slide bearings made of alumina ceramic, carbon or plastic are used throughout, which are lubricated by the pumped medium itself by the medium flows on the jacket of the split pot along to the bottom, there deflected and then the plain bearings are flowed through, for which purpose gaps are provided.
- the impeller In order to make the pump suitable for short periods of dry running, the impeller has a hub with two ceramic ball bearings whose inner races are seated on a metallic axle and on whose outer races a metallic sleeve is shrunk onto which the actual impeller is welded.
- the pump known from EP 1 329 683 A1 is not to be used.
- they can only be driven with a relatively low power because of avoiding long and narrow gaps chosen short construction of the impeller and its hub does not allow long magnet arrangements, which would be required for the transmission of higher torques.
- the present invention has for its object to provide a magnetically coupled centrifugal pump, which is particularly suitable for pumping corrosive and aggressive media and is more suitable for dry running than previous pumps for this purpose.
- Magnetically-coupled centrifugal pumps when transmitting the torque from the driving rotor to the impeller of the pump, suffer induction losses which increase with the relative speed between the rotating permanent magnets and the stationary shell of the containment shell
- the induction losses can be reduced in a pump according to the invention by reducing the diameter of the hub and correspondingly the diameter of the ring of the permanent magnets of the driving rotor. Although only a small number of permanent magnets can be arranged on a reduced circumference, this can be compensated for by lengthening the hub and the driving rotor, without having to fear damage to the pump due to dry running.
- the jacket of the split pot is, as is known, cylindrical or almost cylindrical. Almost cylindrical means a slight, the demolding of the split pot facilitating conicity.
- the length of the split pot is preferably greater than the outer diameter of the shell of the split pot to achieve a smooth running and an exact alignment of the impeller of the pump and for transmitting high torques.
- the length of the split pot is approximately equal to the length of the hub, which is in the containment shell. It can easily be up to a multiple of the outer diameter of the shell of the split pot.
- Zirconium oxide, silicon carbide and silicon nitride are particularly suitable as material for the rolling elements and the races of the ceramic rolling bearings. They are characterized by high hardness, strength and chemical resistance and can be produced with high dimensional stability and surface quality.
- the rolling elements have an average roughness of less than 0.1 microns, more preferably less than 0.05 microns, and the running surfaces of the rolling bearing rings preferably have an average roughness of not more than 0.35 microns, in particular an average roughness of not more than 0.32 ⁇ m.
- Investigations on a centrifugal pump according to the invention with such rolling bearings have shown that even in dry running for hours and days, the temperature of the bearings only by a few degrees Celsius, so that in a pump according to the invention with such ceramic bearings is for the first time an absolute dry running safety. In this case, the additional effort required for this purpose, measured against the technical progress that can be achieved with it, and the achievable high level of operational reliability is insignificant.
- the rolling bearings can be designed as ball bearings or roller bearings. Particularly preferred is the use of radial deep groove ball bearings.
- the hub is stored on two radial bearings. If the ability of radial bearings to absorb axial forces, should be insufficient in individual cases, one or two ceramic thrust bearings can be additionally provided or a radial ball bearing can be replaced by two designed as a radial shoulder bearing ball bearings.
- a pump according to the invention is no longer endangered by dry running, dry running can have a cause which represents a danger to the system in which the pump is operated or to the medium pumped therein.
- a sensor is preferably provided in connection with the pump, which detects a occurring during dry running of the pump or changing the measured variable. The occurrence of such a measurand or the change of such a measurand may be communicated as an indication of dry running to an operator or to a control room and cause the cause to be checked.
- an acoustic sensor is provided. It has been shown that ceramic bearings emit characteristic noise in dry running, which are not present when the ceramic bearings are surrounded by the medium to be pumped and penetrated.
- noises can be easily detected by an acoustic sensor and distinguished from other noises, the distinction being able to be improved by determining the typical frequency spectrum of the noises and narrowing the sensitivity of the acoustic sensor to a frequency range in which the characteristic dry running noise is particularly pronounced strongly occur.
- FIG. 1 shows a magnetically coupled centrifugal pump in a design designed as a centrifugal pump in a partially longitudinal side view
- FIG. 2 shows a detail of the impeller of the centrifugal pump in longitudinal section
- FIG. 3 shows as a detail of the hub for the impeller of the pump in one
- FIG. 4 shows the axis which receives the impeller and the hub in a side view
- Figure 5 shows the axis in a view of the right in Figure 4 end of the axis
- Figures 6 to 8 show longitudinally modified hubs for a pump of the type shown in Figure 1, and
- Figure 9 shows in longitudinal section a hub with conventional plain bearings.
- the pump shown in Figures 1 to 5 has a two-part housing 1.
- the rear part 2 of the housing 1 receives a split pot 3, which has a bottom 4, a slightly conical jacket 5 and a flange 6, which between the rear part of the housing and a front part 7 of the housing is clamped and in this way a medium flowed through the pump chamber 8 separates from a rear space 9, in which a rotor 10 is mounted, which is driven by an electric motor 27, which at the rear end of the housing 1 is attached.
- the rotor 10 is cup-shaped and surrounds the gap pot 3.
- permanent magnets 11 are attached. They are opposed by permanent magnets 12, which are embedded in a sleeve 29, which is mounted on a hub 13, which is arranged in the containment shell 3 and is rotatably mounted on an axis 14.
- the sleeve 29 with the permanent magnets 12 is rotatably connected to the hub 13.
- two ceramic radial deep groove ball bearings 15 and 16 are arranged.
- the inner race 15a of the rear ball bearing 15 abuts against a rear collar surface 17 of the axle 14.
- the inner race 16a of the front ball bearing 16 bears against a front collar surface 18 of the axle 14.
- the outer race 15b of the rear ball bearing 15 is secured by a locking ring 19 engaging in the hub 13.
- the outer race 16 a of the front ball bearing 16 is clamped between a collar surface 20 on the hub 13 and a cylindrical extension 21 of an impeller 22 which is mounted outside of the Spalttop- fes 3 at the front end of the hub 13.
- the axis 14 is inserted with its rear end in a recess 4 provided on the bottom 4 of the can 3 and with its front end in a holder 24 formed in the front housing part 7.
- the rear end of the axle 14 is flattened, as shown in FIG.
- the flattening is designated by the reference numeral 28.
- the recess 23 in the bottom 4 of the can 3 is suitably flattened to match; This results in a positive engagement, which prevents rotation of the axle 14.
- the running rings 15 a, 15 b, 16, a and 16 b of the ball bearings and the balls 15 c and 16 c are made of a ceramic material, in particular of silicon nitride or zirconia.
- An unillustrated ball cage is preferably made of plastic.
- the motor 27 drives the rotor 10. This in turn drives by the magnetic coupling between the permanent magnets 11 and 12, the hub 13 and is therefore referred to as a driving rotor 10.
- the impeller 22 rotates together with the hub 13 to which it is attached, sucks the medium to be pumped through an axially arranged suction port 25 and promotes it through a radially arranged outlet opening 26 out of the pump chamber 8.
- the containment shell 3 is preferably made of plastic, but may also consist of a ceramic, for example of alumina.
- the axis 14 is preferably made of alumina, but may also consist of a plastic. A sucked by the pump liquid medium can flow through an existing between the hub 13 and the sleeve 29 and the gap pot 3 annular gap to the bottom 4 of the split pot 3. There, the medium is deflected and flows back through an existing between the axis 14 and the impeller annular gap 22, where it penetrates the two ceramic ball bearings 15 and 16 and lubricates.
- FIG. 6 shows a longitudinally cut hub 13 on an axle 14, which is modified relative to the corresponding arrangement in FIGS. 1 to 5 in that, instead of the front deep groove ball bearing 16, a radial roller bearing 30 is provided, which with its inner race 30 a on the axle 14 sits, sitting with its outer race 30b in the hub 13 and between inner race 30a and outer race 30b has a ring of preferably cylindrical rollers 30c.
- FIG. 7 shows a longitudinal section of an arrangement of a hub 13 and an axle 14, which differs from the corresponding arrangement in the embodiment according to Figures 1 to 5 in that provided for the two deep groove ball bearings 15 and 16, no separate inner race is. Instead, 14 grooves 15 d and 16 d are provided in the axis, so that the axis 14 itself, which consists of a ceramic material, the function of the inner races of the radial deep groove ball bearings 15 and 16 takes over.
- Figure 8 shows an arrangement of a longitudinally-cut hub 13 and an axle 14, which is modified relative to the arrangement shown in Figures 1 to 5 in that instead of the front deep groove ball bearing 16, a radial roller bearing 30 is provided and that instead of the rear deep groove ball bearing 15 two are designed as a shoulder bearing 31 and 32 formed radial deep groove ball bearings.
- the roller bearing 30 uses as a running surface 34 for its cylindrical rollers 30c a suitably turned off and ending on a shoulder 33 cylindrical portion 34 of the shaft 4, which serves as a running surface for the cylindrical rollers 30c, which are trapped between a shoulder 33 of the axle 14 and a shoulder 3Od of the outer race 30b instead of an inner race.
- the two radial shoulder bearings 31 and 32 are arranged so that their unilateral shoulders 31 d and 32 d abut each other. This makes it possible to transfer or absorb higher axial thrusts between the axle 14 and the hub 13.
- FIG. 9 shows, for comparison, how, in a pump of the type shown in FIGS. 1 to 5, in the hub 13, an axle 14 can be mounted in a conventional manner by means of ceramic slide bearings 35 and 36, which are held at a distance by a spacer sleeve 37 , For lubrication, a helical groove 38 is provided in the plain bearings 35 and 36.
- a pump of the type illustrated in Figs. 1-5 can be converted to conventional plain bearings as shown in Fig. 9, and vice versa, which is an advantage.
- one or more elastomeric rings 39 are provided which compensate for the lower metallic compressive strength of the ceramic materials.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE202007003214U DE202007003214U1 (en) | 2007-02-22 | 2007-02-22 | Magnetically coupled centrifugal pump for pumping e.g. corrosive media, has permanent magnets in hub arranged in section of rotor surrounded by mantle of can, where surfaces encountering in pump space with medium are non-metallic |
PCT/EP2008/001361 WO2008101698A1 (en) | 2007-02-22 | 2008-02-21 | Magnetically coupled centrifugal pump for corrosive media |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1979621A1 true EP1979621A1 (en) | 2008-10-15 |
EP1979621B1 EP1979621B1 (en) | 2012-03-07 |
Family
ID=38056558
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08715923A Revoked EP1979621B1 (en) | 2007-02-22 | 2008-02-21 | Magnetically coupled centrifugal pump for corrosive media |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1979621B1 (en) |
AT (1) | ATE548567T1 (en) |
DE (1) | DE202007003214U1 (en) |
WO (1) | WO2008101698A1 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008064099B4 (en) * | 2008-12-19 | 2016-05-04 | Bühler Motor GmbH | Centrifugal pump with a fixed axis |
CN105020147A (en) * | 2014-04-15 | 2015-11-04 | 高涵文 | Nearly-zero inner leakage stainless steel magnetic drive pump |
CN105020166A (en) * | 2014-04-15 | 2015-11-04 | 高涵文 | Nearly-zero inner leakage fluoroplastic magnetic drive pump |
CN105020145A (en) * | 2014-04-15 | 2015-11-04 | 高涵文 | Anti-dry grinding fluoroplastic magnetic drive pump |
DE102015118022B4 (en) | 2015-10-22 | 2024-05-29 | Pfeiffer Vacuum Gmbh | Rotary displacement vacuum pump |
DE102016204301A1 (en) * | 2016-03-16 | 2017-09-21 | Schaeffler Technologies AG & Co. KG | Pump device, in particular for a coolant pump and vehicle with the pump device |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1496035A (en) * | 1974-07-18 | 1977-12-21 | Iwaki Co Ltd | Magnetically driven centrifugal pump |
DE3207166A1 (en) * | 1981-05-22 | 1982-12-09 | Hermetic Pumpen Gmbh | Centrifugal pump with canned magnetic coupling drive |
EP1329638A1 (en) * | 2002-01-18 | 2003-07-23 | CP Pumpen AG | Magnetically coupled centrifugal pump |
US20060245955A1 (en) * | 2005-04-18 | 2006-11-02 | Kiyotaka Horiuchi | Canned pump |
-
2007
- 2007-02-22 DE DE202007003214U patent/DE202007003214U1/en not_active Expired - Lifetime
-
2008
- 2008-02-21 EP EP08715923A patent/EP1979621B1/en not_active Revoked
- 2008-02-21 AT AT08715923T patent/ATE548567T1/en active
- 2008-02-21 WO PCT/EP2008/001361 patent/WO2008101698A1/en active Application Filing
Non-Patent Citations (1)
Title |
---|
BARTZ W.J. ET AL: "HANDBOOK OF TRIBOLOGY AND LUBRICATION", vol. 12, 2003, EXPERT VERLAG, ISBN: 3-8169-2050-0, article "konstruktionsbeispiele von Wältz-und Gleitlagerausführingen", pages: 122 - 123, XP003025472 |
Also Published As
Publication number | Publication date |
---|---|
EP1979621B1 (en) | 2012-03-07 |
DE202007003214U1 (en) | 2007-05-10 |
ATE548567T1 (en) | 2012-03-15 |
WO2008101698A1 (en) | 2008-08-28 |
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