EP4121659A1 - Kreiselpumpe mit spaltrohrmotor - Google Patents
Kreiselpumpe mit spaltrohrmotorInfo
- Publication number
- EP4121659A1 EP4121659A1 EP21712082.3A EP21712082A EP4121659A1 EP 4121659 A1 EP4121659 A1 EP 4121659A1 EP 21712082 A EP21712082 A EP 21712082A EP 4121659 A1 EP4121659 A1 EP 4121659A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- centrifugal pump
- canned motor
- housing
- bearing
- pump according
- 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.)
- Withdrawn
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
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D13/0606—Canned motor pumps
- F04D13/0633—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
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D13/0606—Canned motor pumps
- F04D13/0626—Details of the can
Definitions
- the invention relates to a centrifugal pump with an impeller which is arranged in a housing and is driven by a canned motor, the canned motor having a device for connecting to the housing and the device comprising a connecting part which is integral with an element for separating a rotor is formed by a stator of the canned motor.
- Centrifugal pumps with canned motors are characterized by an integral and compact design. These pumps have a spiral housing in which an impeller with blades rotates at high speed. It is driven by an electric motor via a pump shaft.
- the stationary stator of the electric motor and the rotating rotor are tightly separated by a tubular inner housing. This so-called can can consist of non-magnetizable chrome-nickel steel or plastic.
- the encapsulated rotor runs in the fluid to dissipate the lost heat.
- the pumped liquid lubricates the two hydrodynamic plain bearings in the rotor space.
- the rotating magnetic field in the stator winding induces a magnetic field in the rotor winding, which sets the rotor in motion.
- the motor housing represents a second safety cover. This is what distinguishes centrifugal pumps with canned motors in addition to their short and compact design and very low noise level compared to conventional centrifugal pumps and magnetic drive pumps.
- centrifugal pumps with canned motor are used wherever hot, aggressive, explosive or poisonous liquids have to be pumped and therefore a high value is placed on encapsulated units without a stuffing box or mechanical seal will. This is done with heating circulation pumps and reactor circulation pumps as well as with process pumps in chemistry and process engineering.
- the design of the can is often a focus of developments.
- the material of the can should be an electrical non-conductor in order to avoid eddy current losses.
- the can should be made as thin as possible, but also pressure-resistant.
- EP 2293417 B1 describes a can of a wet-running electric motor which is made from thermoplastic material and the bearing housing is surrounded on the motor side with thermoplastic material.
- the number of parts and the installation effort should be reduced.
- a fiber-reinforced thermoplastic tape layer is applied in a very complex winding process. The more pressure-resistant the can has to be, the more complex the winding process is.
- the object of the invention is to provide a device comprising a connecting part and an element for separation and a method for producing this device.
- This device should consist of as few individual parts as possible and thereby simplify the assembly of the canned motor of the centrifugal pump.
- the device should consist of an electrical non-conductor and be made extremely thin. At the same time, the device should be pressure-stable and resistant to chemicals.
- the device should be simple and inexpensive to implement.
- the pump-side bearing arrangement is positively and / or cohesively connected to the device.
- a plain bearing is advantageously inserted into a die-casting tool and filled with a plastic, so that a one-piece device with an integrated bearing is created.
- the one-piece device is particularly easy to assemble, since it combines several parts, which previously had to be assembled individually and with considerable effort, into one device. Likewise, the occurrence of assembly errors when pressing the bearing into the bearing seat is avoided. Due to the one-piece design of the invention, a seal with the associated sealing surfaces can be saved.
- the device is made by molding.
- the device is cast from plastic, preferably from high-performance plastic.
- High-performance plastics are a subgroup of thermoplastic plastics that are particularly characterized by their temperature and chemical resistance with improved mechanical properties at the same time. Furthermore, they are electrical non-conductors, which means that eddy current losses can be avoided when the canned motor is operating. Examples are polyether ketones, polyether ether ketones, polyphenylene sulfides and polyamides. In contrast to devices made of brass, devices made of high-performance plastic can be made thinner.
- the device takes on the task of a can, which is designed as a one-piece component at the same time as a connecting part, which is designed as a so-called pressure cover.
- the reinforcement part which is usually used to increase the rigidity and compressive strength of the device is required, already inserted into the injection molding tool and filled with high-performance plastic, so that a one-piece device with an integrally formed connecting part, a tubular element for separating and a cast-in bearing as well as a cast reinforcement part is created.
- the reinforcement part which is designed as a stiffening tube made of carbon fiber or as a winding part made of carbon fiber reinforced plastic tape, can be made particularly thin, so that a composite of high-performance plastic and winding part is created, the wall thickness of which is less than 2 mm, preferably less than 1 , 5 mm, in particular less than 1 mm.
- the bearing arrangements can also be implemented as roller bearings. This can also be inserted into the die-casting tool and injected with plastic without the rolling elements being injected at the same time.
- Another variant could be a two-component injection molding process in which the plain bearing is molded from a plastic base. For example, a plastic-bonded graphite material could be used for this.
- the pump-side bearing arrangement and the reinforcement part are filled with high-performance plastic under pressure in the plastic injection molding process according to the invention, so that a one-piece device is created.
- Die-casting tools and injection molding processes are proven and well-known in the processing of high-performance plastics, especially in the production of large quantities with high demands on manufacturing tolerances and simultaneous reduction in production costs.
- the device with the integrated bearing arrangement can according to the invention for connec tion of a canned motor with the pump part of a centrifugal pump who used the.
- the invention advantageously separates the rotor from the stator of the canned motor in a sealing manner and avoids eddy current losses during its operation.
- the one-piece design of the device as an assembly which, according to the current state of technology, consisted of a pressure cover, a plastic liner, an O-ring and a plain bearing, is particularly advantageous.
- this one-piece assembly can be supplemented by a cast reinforcement part, which can be designed as a wound part or carbon fiber tube, whereby an assembly step can be reduced again.
- FIG. 1 shows a section of a centrifugal pump with a canned motor.
- FIG. 1 shows a section of a centrifugal pump with a canned motor with an impeller 2 which is arranged in a housing 1.
- the fluid enters the pump chamber from below and is fed axially to the impeller 2.
- the rotating impeller 2 transfers kinetic energy to the fluid, which accumulates in the tapered pressure port and leaves the pump chamber upwards.
- the impeller 2 is arranged on a shaft 10 which is driven by a canned motor consisting of a rotor 6 and a stator 5.
- the canned motor has a device 3 for connection to the housing 1.
- the device 3 comprises a connecting part 15 which is formed in one piece with an element 8 for separating the rotor 6 from the stator 5.
- the device 3 consists of a plastic, preferably a high-performance plastic, which is advantageously temperature and pressure stable and an electrical non-conductor.
- the element 8 is designed as a tubular section, which fulfills the function of a can and separates the rotor 6 from the stator 5 in a completely sealing manner is lubricated by the fluid.
- a connecting part 15 is formed on the pump side, to which the housing 1 is attached directly or indirectly and thus the pump chamber of the impeller 2 closes off. As a result, the connecting part 15 fulfills the task of a pressure cover.
- the bearing arrangement 14 is integrated into the device 3 by primary molding, preferably by injection molding.
- the bearing arrangement 14 is preferably carried out as a plain bearing.
- bearing arrangements 14 in the form of a roller bearing are also conceivable.
- the bearing assembly 14 enables the shaft 10 to functionally move.
- a rotor 6 is attached to it. Between the bearing arrangement 14 and the rotor 6, an Axialla ger 13 is mounted.
- a second bearing assembly 11 is integrated, which supports the motorsei term end of the shaft 10.
- the end bearing cover 9 is placed in the motor housing 7, which tightly and tightly closes the canned motor as a second protective layer.
- a seal 12 preferably an O-ring, between the end bearing cover 9, the motor housing 7 and the element 8 is arranged.
- the stator 5 is mounted so as to enclose the rotor 6.
- the reinforcement part 4 can be designed as a stiffening tube made of carbon fiber or as a winding part made of carbon fiber-reinforced plastic tape. To increase the rigidity, the reinforcement part 4 is advantageously placed in a die-casting tool and, together with the bearing arrangement 14, is cast in with a high-performance plastic, so that a one-piece device 3 is created.
- the wall thickness of the ele ment 8 in combination with the reinforcement part 4 is less than 2 mm, preferably less than 1.5 mm, in particular less than 1 mm.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102020107584.7A DE102020107584A1 (de) | 2020-03-19 | 2020-03-19 | Kreiselpumpe mit Spaltrohrmotor |
| PCT/EP2021/056059 WO2021185653A1 (de) | 2020-03-19 | 2021-03-10 | Kreiselpumpe mit spaltrohrmotor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4121659A1 true EP4121659A1 (de) | 2023-01-25 |
Family
ID=74874829
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP21712082.3A Withdrawn EP4121659A1 (de) | 2020-03-19 | 2021-03-10 | Kreiselpumpe mit spaltrohrmotor |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4121659A1 (de) |
| CN (1) | CN115210470A (de) |
| DE (1) | DE102020107584A1 (de) |
| WO (1) | WO2021185653A1 (de) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19912614A1 (de) * | 1999-03-22 | 2000-09-28 | Wilo Gmbh | Spalttopf für Kreiselpumpe |
| EP2604860B1 (de) * | 2011-12-15 | 2020-02-05 | Wilo Se | Nassläuferpumpe mit Vorkammer |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE838400C (de) * | 1949-10-10 | 1952-05-08 | E M B Elektromotorenbau A G | Umlaufpumpe |
| CA2043519C (en) | 1990-05-31 | 1998-11-24 | Takao Umezawa | Motor casing made of resin and method of manufacturing the same |
| CH688454A5 (de) | 1994-06-01 | 1997-09-30 | Cp Pumpen Ag | Spalttopf fuer eine Permanentmagnetkupplung. |
| US5997261A (en) | 1997-10-31 | 1999-12-07 | Siemens Canada Limited | Pump motor having fluid cooling system |
| DE102005009260A1 (de) | 2005-02-25 | 2006-08-31 | Wilo Ag | Spaltrohr einer Kreiselmotorpumpe |
| EP2293417B1 (de) * | 2009-09-05 | 2016-07-06 | Grundfos Management A/S | Spaltrohr |
| DE102013004339A1 (de) * | 2013-03-14 | 2014-09-18 | Wilo Se | Pumpenaggregat mit einer einstückigen Lagereinheit |
| CN106151055B (zh) * | 2015-03-26 | 2019-06-07 | 浙江三花汽车零部件有限公司 | 电驱动泵 |
-
2020
- 2020-03-19 DE DE102020107584.7A patent/DE102020107584A1/de active Pending
-
2021
- 2021-03-10 WO PCT/EP2021/056059 patent/WO2021185653A1/de not_active Ceased
- 2021-03-10 CN CN202180021847.6A patent/CN115210470A/zh active Pending
- 2021-03-10 EP EP21712082.3A patent/EP4121659A1/de not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19912614A1 (de) * | 1999-03-22 | 2000-09-28 | Wilo Gmbh | Spalttopf für Kreiselpumpe |
| EP2604860B1 (de) * | 2011-12-15 | 2020-02-05 | Wilo Se | Nassläuferpumpe mit Vorkammer |
Non-Patent Citations (1)
| Title |
|---|
| See also references of WO2021185653A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115210470A (zh) | 2022-10-18 |
| WO2021185653A1 (de) | 2021-09-23 |
| DE102020107584A1 (de) | 2021-09-23 |
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Legal Events
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