EP3012457B1 - Electric motor vehicle coolant pump - Google Patents

Electric motor vehicle coolant pump Download PDF

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Publication number
EP3012457B1
EP3012457B1 EP14189767.8A EP14189767A EP3012457B1 EP 3012457 B1 EP3012457 B1 EP 3012457B1 EP 14189767 A EP14189767 A EP 14189767A EP 3012457 B1 EP3012457 B1 EP 3012457B1
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EP
European Patent Office
Prior art keywords
motor
unit
electric motor
motor vehicle
vehicle coolant
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.)
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Application number
EP14189767.8A
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German (de)
French (fr)
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EP3012457A1 (en
Inventor
Jamal Chargui
Thomas Wienecke
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pierburg Pump Technology GmbH
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Pierburg Pump Technology GmbH
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Priority to EP14189767.8A priority Critical patent/EP3012457B1/en
Publication of EP3012457A1 publication Critical patent/EP3012457A1/en
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Publication of EP3012457B1 publication Critical patent/EP3012457B1/en
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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
    • F04D13/0673—Units comprising pumps and their driving means the pump being electrically driven the motor being of the inside-out type
    • 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
    • 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
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/5806—Cooling the drive system
    • 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
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/586—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps
    • F04D29/588—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps cooling or heating the machine

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

Description

Die Erfindung betrifft eine elektrische KFZ-Kühlmittelpumpe mit einem Gehäuse, das eine Pumpeneinheit und eine Motoreinheit aufweist, wobei die Motoreinheit einen mittels Lagermitteln im Gehäuse gelagerten Motorrotor sowie einen Motorstator besitzt, wobei der Motorrotor ein Laufradorgan mit Schaufelelementen der Pumpeneinheit und ein in Axialrichtung verlaufendes Antriebsorgan aufweist, wobei Einlass- und Auslassöffnungen vorgesehen sind, die ein Durchströmen der Motoreinheit mit einem Kühlfluid von einer Druckseite der Pumpeneinheit zu einer Saugseite der Pumpeneinheit ermöglicht, wobei im Laufradorgan die Auslassöffnungen zur fluidischen Verbindung mit der Saugseite der Pumpeneinheit vorgesehen sind.The invention relates to an electric motor vehicle coolant pump having a housing which has a pump unit and a motor unit, wherein the motor unit has a motor rotor mounted in the housing by means of bearing means and a motor stator, the motor rotor comprising an impeller element with blade elements of the pump unit and an axially extending drive element wherein inlet and outlet openings are provided, which allows a flow of the motor unit with a cooling fluid from a pressure side of the pump unit to a suction side of the pump unit, wherein in the impeller member, the outlet openings are provided for fluid communication with the suction side of the pump unit.

Derartige elektrische KFZ-Kühlmittelpumpen sind aus dem Stand der Technik hinlänglich bekannt. So offenbart die DE 199 48 972 A1 eine Motorpumpe mit einer Pumpeneinheit und einer Motoreinheit, wobei die Motoreinheit einen als Außenläufer gestalteten Motorrotor besitzt, der ein Laufradorgan mit Schaufelelementen besitzt. Zur Kühlung der Motoreinheit ist es bekannt, zu pumpendes Kühlfluid von einer Druckseite der Pumpeneinheit durch die Motoreinheit hin zu einer Saugseite der Pumpeneinheit zu führen. Gemäß der DE 199 48 972 A1 ist hier eine Öffnung im Gehäuse im Bereich der Pumpeneinheit vorgesehen, durch die das Kühlfluid in die Motoreinheit dringt, wobei das Kühlfluid die Motoreinheit über eine hohl ausgeführte Motorrotorwelle wieder verlässt. Des Weiteren ist es bekannt, dass das Kühlfluid die Motoreinheit über Öffnungen im Lagerbereich der Motorrotorwelle verlässt. In beiden Fällen kann die Funktion und Lebensdauer der KFZ-Kühlmittelpumpe durch Ablagerungen von im Kühlfluid befindlichen Teilchen, wie zum Beispiel Gießsand, beeinträchtigt werden. Insbesondere bei einer Ableitung des Kühlfluids durch den Lagerbereich kommt es zu einer hydroabrasiven Strömung, die zu einem hohen radialen und axialen Lagerverschleiß führt.Such electric vehicle coolant pumps are well known from the prior art. So revealed the DE 199 48 972 A1 a motor pump having a pump unit and a motor unit, the motor unit having a designed as an external rotor motor rotor having an impeller member with blade elements. For cooling the motor unit, it is known to guide cooling fluid to be pumped from a pressure side of the pump unit through the motor unit to a suction side of the pump unit. According to the DE 199 48 972 A1 Here, an opening in the housing in the region of the pump unit is provided, through which the cooling fluid penetrates into the motor unit, wherein the cooling fluid leaves the motor unit via a hollow engine rotor shaft again. Furthermore, it is known that the cooling fluid leaves the motor unit via openings in the bearing area of the motor rotor shaft. In either case, the function and life of the automotive coolant pump may be affected by deposits of particles in the cooling fluid, such as foundry sand. In particular, in a derivative of the cooling fluid through the storage area, there is a hydro-abrasive flow, which leads to a high radial and axial bearing wear.

Aus der DE 10 2009 009898 A1 und der US 2004/0234395 A1 ist es hierzu bekannt, Auslassöffnungen im Laufradorgan vorzusehen, um die Schmutzteilchen über die Auslassöffnungen abzuführen, wobei jedoch noch immer auch eine Verschmutzung des Lagerbereiches stattfindet.From the DE 10 2009 009898 A1 and the US 2004/0234395 A1 For this purpose, it is known to provide outlet openings in the impeller member in order to remove the dirt particles via the outlet openings, but contamination of the storage area still occurs.

Aufgabe der Erfindung ist es daher, den oben genannten Nachteil auf einfache und kostengünstige Weise zu vermeiden.The object of the invention is therefore to avoid the above-mentioned disadvantage in a simple and cost-effective manner.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass die Auslassöffnungen im Bereich der vom Motorrotormittelpunkt abgewandten Enden der Schaufelelemente angeordnet sind. Durch das Vorsehen dieser Auslassöffnungen im Bereich der vom Motorrotormittelpunkt abgewandten Enden der Schaufelelemente des Laufrades wird die Strömung in diesem Bereich optimiert, so dass die Schmutzteilchen mit der Strömung mitgerissen werden und über die Auslassöffnung entweichen, ohne in den kritischen Lagerbereich zu gelangen. Nachfolgend werden vorhandene Schmutzteilchen durch die Zentrifugalkraft vom Lagerbereich der Motorrotorwelle weggeführt.This object is achieved in that the outlet openings are arranged in the region of the ends remote from the engine rotor center of the blade elements. By providing these outlet openings in the region of the ends remote from the engine rotor center of the blade elements of the impeller, the flow in this area is optimized, so that the dirt particles are entrained with the flow and escape through the outlet opening, without entering the critical storage area. Subsequently, existing dirt particles are led away by the centrifugal force from the bearing area of the motor rotor shaft.

In einer besonders vorteilhaften Ausführungsform ist der Motorrotor topfförmig ausgebildet, wobei das Antriebsorgan zylinderförmig ausgebildet ist. Hierbei können sich dann eventuell vorhandene Schmutzteilchen im Topfbereich des Motorrotors sammeln, ohne schädigend auf die Motoreinheit einzuwirken. Hierbei ist es besonders vorteilhaft, wenn der Motorrotor ein Außenläufer ist.In a particularly advantageous embodiment, the motor rotor is cup-shaped, wherein the drive member is cylindrical. In this case, any dirt particles that may be present in the pot area of the motor rotor can collect without adversely affecting the motor unit. It is particularly advantageous if the motor rotor is an external rotor.

In vorteilhafter Weise ist die Motoreinheit ein elektronisch kommutierter Elektromotor.Advantageously, the motor unit is an electronically commutated electric motor.

Es hat sich als besonders vorteilhaft erwiesen, wenn die Öffnungen als Bohrungen ausgeführt sind, die kreisförmig, um 90° versetzt, angeordnet sind. Hierdurch findet eine auf die Lagermittel einwirkende Axialschubentlastung statt, was sich weiterhin positiv auf die Lebensdauer der Lagermittel auswirkt.It has proved to be particularly advantageous if the openings are designed as bores which are arranged in a circle, offset by 90 °. This results in an acting on the bearing means Axialschubentlastung instead, which continues to have a positive effect on the life of the bearing means.

Des Weiteren kann in vorteilhafter Weise die Einlassöffnung als ringförmiger Spalt zwischen dem Gehäuse und dem zylinderförmigen Antriebsorgan ausgeführt sind. Insbesondere beim Nassläuferprinzip ergibt sich naturgemäß ein ringförmiger Spalt zwischen dem zylinderförmigen Antriebsorgan und dem Gehäuse, welcher auf einfache Weise die Eintrittsöffnung ausbildet.Furthermore, the inlet opening can be designed as an annular gap between the housing and the cylindrical drive member in an advantageous manner. In particular, in the wet-runner principle naturally results in an annular gap between the cylindrical drive member and the housing, which forms the inlet opening in a simple manner.

Die Erfindung wird nachfolgend anhand einer Zeichnung näher erläutert, hierbei zeigt:

  • Figur 1 eine Schnittansicht einer erfindungsgemäßen KFZ-Kühlmittelpumpen,
  • Figur 2 eine schematische Schnittansicht der KFZ-Kühlmittelpumpe aus Fig. 1, und
  • Figur 3 eine perspektivische Ansicht eines Motorrotors mit Laufradorgan.
The invention will be explained in more detail with reference to a drawing, in which:
  • FIG. 1 a sectional view of a motor vehicle coolant pump according to the invention,
  • FIG. 2 a schematic sectional view of the motor vehicle coolant pump Fig. 1 , and
  • FIG. 3 a perspective view of a motor rotor with impeller member.

Figur 1 zeigt in einer Schnittansicht eine erfindungsgemäße KFZ-Kühlmittelpumpe 2. Die KFZ-Kühlmittelpumpe 2 weist hierbei ein mehrteiliges Gehäuse 4 aus Kunststoff auf, in dem im Wesentlichen eine Motoreinheit 6 und eine Pumpeneinheit 8 vorgesehen sind. Die Pumpeneinheit 8 besteht im Wesentlichen aus einem Laufradorgan 10 mit angeformten Schaufelelementen 12. Auf bekannte Weise wird durch das Laufradorgan 10 im Gehäuseteil 14 der Pumpeneinheit 8 ein Druckaufbau bewirkt, wobei Kühlfluid über einen Einlassanschluss 16 zuführbar und über einen Auslassanschluss 18 abführbar ist. Das Laufradorgan 10 der Pumpeneinheit 8 ist einstückig mit einem zylindrischen Antriebsorgan 20 der Motoreinheit 6 verbunden und bildet auf diese Weise einen topfförmigen Motorrotor 22. Eine derartige Anordnung wird üblicher Weise als Außenläufer bezeichnet. Der Motorrotor 22 ist hierbei über Lagermittel 24 in einem Spalttopf 26 des Gehäuses 4 auf bekannte Weise gelagert. Der Motorrotor 22 bildet also hier zusammen mit einer Statoreinheit 28 einen elektronisch kommutierten Elektromotor, wobei im Antriebsorgan 20 des Motorrotors 22 nicht weiter dargestellte eingebettete Permanentmagnete vorgesehen sind, so dass der Motorrotor 22 durch das in der Statoreinheit 28 erzeugbare rotatorisch wandernde Magnetfeld mitgeschleppt und in Drehung versetzt wird. Als Einlassöffnung 30 für ein die Motoreinheit 6 zu kühlendes Kühlfluid ist im vorliegenden Ausführungsbeispiel ein ringförmiger Spalt zwischen dem Gehäuse 4, hier zwischen dem Gehäuseteil 14 und dem zylinderförmigen Antriebsorgan 20 vorgesehen. Das Kühlfluid wird also über diese Einlassöffnung 30 von einer Druckseite 32 der Pumpeneinheit 8 in einen Spalt zwischen dem zylinderförmigen Antriebsorgan 20 und dem Spalttopf 26 hin zu Auslassöffnungen 34 zu einer Saugseite 36 der Pumpeneinheit 8 gefördert. Eventuell im Kühlfluid vorhandene Schmutzpartikel werden aufgrund ihrer Zentrifugalkraft im Übergang 38 zwischen dem zylinderförmigen Antriebsorgan 20 und dem Laufradorgan 10 gesammelt, so dass sie die Motoreinheit 6 und hier insbesondere die Lagermittel 24 nicht schädigen können. FIG. 1 shows a sectional view of a motor vehicle coolant pump according to the invention 2. The motor vehicle coolant pump 2 in this case has a multi-part housing 4 made of plastic, in which substantially a motor unit 6 and a pump unit 8 are provided. The pump unit 8 consists essentially of an impeller member 10 with molded blade elements 12. In a known manner, a pressure build-up is effected by the impeller member 10 in the housing part 14 of the pump unit 8, wherein cooling fluid can be supplied via an inlet port 16 and via an outlet port 18 can be discharged. The impeller member 10 of the pump unit 8 is integrally connected to a cylindrical drive member 20 of the motor unit 6 and thus forms a cup-shaped motor rotor 22. Such an arrangement is commonly referred to as external rotor. The motor rotor 22 is in this case mounted via bearing means 24 in a containment shell 26 of the housing 4 in a known manner. Thus, together with a stator unit 28, the motor rotor 22 forms an electronically commutated electric motor, wherein embedded permanent magnets (not shown further) are provided in the drive member 20 of the motor rotor, so that the motor rotor 22 is entrained by the rotatably traveling magnetic field that can be generated in the stator unit 28 and is rotating is offset. In the present exemplary embodiment, an annular gap between the housing 4, here between the housing part 14 and the cylindrical drive member 20, is provided as the inlet opening 30 for a cooling fluid to be cooled for the motor unit 6. The cooling fluid is thus conveyed via this inlet opening 30 from a pressure side 32 of the pump unit 8 into a gap between the cylindrical drive member 20 and the containment shell 26 toward outlet openings 34 to a suction side 36 of the pump unit 8. Any dirt particles present in the cooling fluid are collected due to their centrifugal force in the transition 38 between the cylindrical drive member 20 and the impeller member 10, so that they can not damage the motor unit 6 and in particular the bearing means 24.

Figur 2 zeigt in einer schematischen Ansicht den Kühlfluidstrom von der Einlassöffnung 30 zwischen dem Gehäuse 4 und dem Antriebsorgan 20 über einen Spalt zwischen dem Antriebsorgan 20 und dem Spalttopf 26 hin zu den Auslassöffnungen 34. FIG. 2 3 shows a schematic view of the flow of cooling fluid from the inlet opening 30 between the housing 4 and the drive member 20 through a gap between the drive member 20 and the containment shell 26 toward the outlet openings 34.

Figur 3 zeigt noch einmal in einer perspektivischen Ansicht den Motorrotor 22 mit dem Laufradorgan 10 und den Auslassöffnungen 34, die hier als Bohrungen ausgeführt sind, die kreisförmig, um 90° versetzt, angeordnet sind. FIG. 3 shows again in a perspective view of the motor rotor 22 with the impeller member 10 and the outlet openings 34, which are designed here as bores, which are arranged in a circle, offset by 90 °.

Claims (6)

  1. Electric motor vehicle coolant pump comprising a housing (4) having a pump unit (8) and a motor unit (6), wherein the motor unit (6) has a motor rotor (22) supported in the housing (4) by means of bearing means (24), as well as a motor stator (28),
    wherein the motor rotor (22) comprises an impeller member (10) with blade elements (12) of the pump unit (8) and a drive member (20) extending in the axial direction, wherein inlet and outlet openings (30, 34) are provided which allow a cooling fluid to flow through the motor unit (6) from the pressure side (24) of the pump unit (8) to a suction side (25) of the pump unit, wherein the impeller member (10) is provided with the outlet openings (34) for fluid communication with the suction side (36) of the pump unit (8), characterized in that the outlet openings (36) are arranged in the region of the ends of the blade elements (12) averted from the center of the motor rotor.
  2. Electric motor vehicle coolant pump of claim 1, characterized in that the motor rotor (22) is of pot-shaped design, the drive member (20) being cylinder-shaped.
  3. Electric motor vehicle coolant pump of claim 2, characterized in that the motor rotor (22) is an external rotor.
  4. Electric motor vehicle coolant pump of one of claims 1 - 3, characterized in that the motor unit (6) is an electronically commutated electric motor.
  5. Electric motor vehicle coolant pump of one of the preceding claims, characterized in that the outlet openings (34) are designed as circularly arranged bores offset by 90°.
  6. Electric motor vehicle coolant pump of one of claims 4-5, characterized in that the inlet opening (30) is formed as an annular gap between the housing (4) and the cylinder-shaped drive member (20).
EP14189767.8A 2014-10-21 2014-10-21 Electric motor vehicle coolant pump Active EP3012457B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14189767.8A EP3012457B1 (en) 2014-10-21 2014-10-21 Electric motor vehicle coolant pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14189767.8A EP3012457B1 (en) 2014-10-21 2014-10-21 Electric motor vehicle coolant pump

Publications (2)

Publication Number Publication Date
EP3012457A1 EP3012457A1 (en) 2016-04-27
EP3012457B1 true EP3012457B1 (en) 2018-12-12

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EP14189767.8A Active EP3012457B1 (en) 2014-10-21 2014-10-21 Electric motor vehicle coolant pump

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016122784A1 (en) 2016-11-25 2018-05-30 Pierburg Pump Technology Gmbh Electric vehicle coolant pump
CN110566516A (en) * 2019-09-27 2019-12-13 汉宇集团股份有限公司 Automobile electronic water pump capable of cooling circuit board

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5997261A (en) * 1997-10-31 1999-12-07 Siemens Canada Limited Pump motor having fluid cooling system
DE19948972A1 (en) 1999-10-12 2001-04-19 Bosch Gmbh Robert Motor pump driven by induction motor with rotor in chamber open to pump section
JP2004346774A (en) * 2003-05-20 2004-12-09 Aisan Ind Co Ltd Magnetic coupling pump
DE102009009898A1 (en) * 2009-02-20 2010-08-26 Bayerische Motoren Werke Aktiengesellschaft Coolant pump for vehicles
DE102011117183B4 (en) * 2011-10-28 2014-10-16 Ruhrpumpen Gmbh Partial flow guide, in particular a magnetic coupling pump

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

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