EP4274965A1 - Fluidpumpe - Google Patents
FluidpumpeInfo
- Publication number
- EP4274965A1 EP4274965A1 EP21843683.0A EP21843683A EP4274965A1 EP 4274965 A1 EP4274965 A1 EP 4274965A1 EP 21843683 A EP21843683 A EP 21843683A EP 4274965 A1 EP4274965 A1 EP 4274965A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- stator
- fluid pump
- separating means
- space
- fluid
- 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.)
- Pending
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
- F04D13/064—Details of the magnetic circuit
-
- 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 present invention relates to a fluid pump, in particular for a motor vehicle, a motor vehicle with such a fluid pump and a method for stiffening a stator structure of an electric motor of such a fluid pump.
- the object of the present invention is to improve the noise behavior of a fluid pump.
- a fluid pump having the features of claim 1.
- Claims 7, 8, 9 protect a motor vehicle with at least one fluid pump described here or a method for stiffening a stator structure of an electric motor of a fluid pump described here or use of a fluid pump described here for cooling and/or temperature control of a cooling water circuit.
- the dependent claims relate to advantageous developments.
- a fluid pump in particular for a motor vehicle, is proposed, having:
- At least one impeller for delivering a fluid through a fluid chamber of the housing
- stator which is designed without injection molding in the region of its stator teeth carrying a coil winding, being joined with a metallic separating agent, which divides the fluid pump into a wet space on the rotor side and a dry space on the stator side.
- the free ends of the stator teeth joined with the separating agent form a press fit and/or a material connection with the separating agent in order to stiffen the stator structure.
- the press fit and/or the material connection cause(s) a fixed position of the individual stator teeth in relation to the separating means and thus a stiffening of the stator structure.
- This stiffening in turn brings about a sufficient spacing between a natural frequency of the stator structure--which is designed without injection molding in the region of its stator teeth carrying a coil winding--and an operational excitation frequency of the electric motor.
- a method for stiffening a stator structure of a fluid pump is also proposed, in which a stator, which is designed without injection molding in the area of its teeth carrying a coil winding, is provided with a metallic separating agent, which divides the fluid pump into a wet space on the rotor side and a dry space on the stator side , is joined.
- a motor vehicle with at least one fluid pump of the type described above is also proposed.
- a motor vehicle is any type of vehicle that requires cooling and/or temperature control of a cooling water circuit or cooling water circuit, such as cooling and/or temperature control of a cooling water circuit or cooling water circuit assigned to a battery or an electric motor. This can be a partially electric or fully electric vehicle, but in particular passenger cars and/or commercial vehicles.
- FIG. 1b shows the fluid pump shown in FIG. 1 in a second perspective view in the form of an exploded view
- Fig. 2 a proposed arrangement according to the invention.
- the fluid pump FP shown in FIGS. 1a and 1b is an electric cooling water pump sold by the applicant in the form of a radial pump, also called a radial centrifugal pump.
- This cooling water pump comprises an electric motor EM with a so-called containment shell 10, which divides the cooling water pump into a wet space NR on the rotor side and a dry space TR on the stator side.
- the containment shell 10 is designed as an injection-molded plastic element, namely from a so-called polyphenylene sulfide (PPS).
- PPS polyphenylene sulfide
- This material is characterized by a very high heat resistance, a high chemical resistance and rigidity.
- the PPS material can be produced as a thermoset or as a thermoplastic.
- stator 2 and the can 10 are joined to one another in such a way that they form a gap S with respect to one another, through which they are spaced apart from one another at the joint (FIG. 1a).
- the metallic part of the stator 2 comprises a laminated core with a large number of laminated layers connected to one another.
- the laminated core forms individual stator teeth 6 which carry a coil winding 8 and whose free ends face the can 10 in the radial direction of the cooling water pump.
- the stator 2 also includes a non-metallic part in the form of an overmoulded plastic mass, which is integrally formed on the laminated core and extends into the spaces between the stator teeth, i.e. the stator teeth 6 wrapped around the individual coils (cf. coil 8).
- This plastic mass gives the stator structure a certain rigidity.
- stator structure according to FIG. 2 in which such a plastic encapsulation in the region of the coil-wound (cf. coil 8) stator teeth 6 is omitted. Saving this plastic mass is accompanied by a softening of the stator structure, which oscillates during operation of the cooling water pump.
- the individual stator teeth 6 or their free ends perform a wobbling movement relative to the separating means 10.
- this separating means 10 is metallic, for example made of stainless steel.
- the vibration of the stator structure is transmitted both to a pump housing part that is joined to the laminated core of the stator 2 - which is also made of a PPS material - and to the metallic parting agent 10, which in turn is joined to this pump housing part, so that the release agent 10 is correspondingly directly and indirectly excited.
- the separating means 10 also interacts with the cooling water flowing through the wet space NR, which carries fine, production-related molding sand particles—so-called quartz sand particles—with it, such as the molding sand particles occurring during the casting production of an engine block.
- the vibration of the separating agent 10 is transferred to these molding sand particles, which as such collide with the conveying of the cooling water against the separating agent 10 and thereby generate an undesirable noise level, which is to be suppressed according to the invention.
- the separating means 10 acts like a resonance body, against which the individual molding sand particles collide and thereby generate structure-borne noise, which is transmitted to the entire pump structure.
- stator teeth 6 In order to reduce noise, it is proposed to join the free ends of the stator teeth 6 with the separating means 10 to form a press bond in order to stiffen the stator structure. In addition or as an alternative to this, the free ends of the stator teeth 6 can also be bonded to the separating means 10 in order to bring about the stiffening.
- the press fit and/or the material connection causes/causes a fixed position of the individual free ends of the stator teeth 6 with respect to the separating means 10 and thus a stiffening of the stator structure.
- the bond can be realized in the form of a bond or weld. Accordingly, the individual free ends of the stator teeth 6 do not necessarily have to lie on the separating means 10 and be pressed with it, as long as a corresponding material connection causes the said determination.
- the material connection can be provided on one of two associated end faces or even on the two associated end faces of a stator tooth 6, for example by forming a bond using a high-temperature-resistant high-performance adhesive or by forming a weld, for example one Spot welding, especially since the individual free ends of the stator teeth 6 and the separating means 10 form a metallic pairing that makes this possible.
- This stiffening proposed according to the invention in turn brings about a sufficient spacing between a natural frequency of the stator structure and an operational excitation frequency of the electric motor EM. This is advantageously expressed in the said noise reduction.
- the separating means 10 which - as already explained above - contrary to the representation according to the prior art (cf. Fig. 1a, Fig. 1b) is made of metal, for example in the form of stainless steel, can be in the form of a containment shell, in particular in Shape of a deep-drawn sheet be formed.
- the separating means 10 can also be in the form of an extruded profile, which in turn can be part of an assembled containment shell or can be joined to an associated housing section and sealed against it.
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 |
|---|---|---|---|
| DE102021200126.2A DE102021200126A1 (de) | 2021-01-08 | 2021-01-08 | Fluidpumpe |
| PCT/EP2021/086858 WO2022148643A1 (de) | 2021-01-08 | 2021-12-20 | Fluidpumpe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4274965A1 true EP4274965A1 (de) | 2023-11-15 |
Family
ID=79602254
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP21843683.0A Pending EP4274965A1 (de) | 2021-01-08 | 2021-12-20 | Fluidpumpe |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4274965A1 (de) |
| DE (1) | DE102021200126A1 (de) |
| WO (1) | WO2022148643A1 (de) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102019205098A1 (de) * | 2019-04-09 | 2020-10-15 | Volkswagen Aktiengesellschaft | Elektromotor mit verringertem Spalt zur Optimierung des magnetischen Flusses zwischen Rotor und Stator |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3914859A (en) | 1974-01-17 | 1975-10-28 | Ray T Pierson | Method of fabricating closed slot stator construction particularly adapted for stepper motors |
| JP2640411B2 (ja) * | 1992-12-15 | 1997-08-13 | 日本サーボ株式会社 | キャンドモータポンプ |
| JP5516976B2 (ja) * | 2010-07-14 | 2014-06-11 | アイシン精機株式会社 | 電動ポンプ |
| DE102011009192B3 (de) | 2011-01-21 | 2012-06-28 | Continental Automotive Gmbh | Elektrische Fluidpumpe mit gekühltem Nasslaufbereich |
| US9360015B2 (en) * | 2012-07-16 | 2016-06-07 | Magna Powertrain Of America, Inc. | Submerged rotor electric water pump with structural wetsleeve |
| JP2017015002A (ja) * | 2015-07-01 | 2017-01-19 | 日本電産サンキョー株式会社 | ポンプ装置 |
-
2021
- 2021-01-08 DE DE102021200126.2A patent/DE102021200126A1/de not_active Ceased
- 2021-12-20 WO PCT/EP2021/086858 patent/WO2022148643A1/de not_active Ceased
- 2021-12-20 EP EP21843683.0A patent/EP4274965A1/de active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102019205098A1 (de) * | 2019-04-09 | 2020-10-15 | Volkswagen Aktiengesellschaft | Elektromotor mit verringertem Spalt zur Optimierung des magnetischen Flusses zwischen Rotor und Stator |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2022148643A1 (de) | 2022-07-14 |
| DE102021200126A1 (de) | 2022-07-14 |
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Legal Events
| Date | Code | Title | Description |
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| STAA | Information on the status of an ep patent application or granted ep patent |
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| STAA | Information on the status of an ep patent application or granted ep patent |
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| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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| STAA | Information on the status of an ep patent application or granted ep patent |
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| 17P | Request for examination filed |
Effective date: 20230808 |
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| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
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| DAV | Request for validation of the european patent (deleted) | ||
| DAX | Request for extension of the european patent (deleted) | ||
| RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: SCHAEFFLER TECHNOLOGIES AG & CO. KG |
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| STAA | Information on the status of an ep patent application or granted ep patent |
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| 17Q | First examination report despatched |
Effective date: 20251208 |