EP3924624B1 - Electrical screw spindle coolant pump - Google Patents

Electrical screw spindle coolant pump Download PDF

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Publication number
EP3924624B1
EP3924624B1 EP19817281.9A EP19817281A EP3924624B1 EP 3924624 B1 EP3924624 B1 EP 3924624B1 EP 19817281 A EP19817281 A EP 19817281A EP 3924624 B1 EP3924624 B1 EP 3924624B1
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EP
European Patent Office
Prior art keywords
motor
housing
chamber
spindle
electric
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Active
Application number
EP19817281.9A
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German (de)
French (fr)
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EP3924624A1 (en
Inventor
Daniel Döhler
Franz Pawellek
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Nidec GPM GmbH
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Nidec GPM GmbH
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Publication of EP3924624A1 publication Critical patent/EP3924624A1/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
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F04C2/16—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0096—Heating; Cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/04—Heating; Cooling; Heat insulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/04—Heating; Cooling; Heat insulation
    • F04C29/047—Cooling of electronic devices installed inside the pump housing, e.g. inverters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/40—Electric motor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/80—Other components
    • F04C2240/808—Electronic circuits (e.g. inverters) installed inside the machine

Definitions

  • the present invention relates to an electric coolant pump of a screw pump type for pumping a coolant circuit or the like, particularly for pumping corrosive liquid media.
  • Screw pumps are positive displacement pumps that allow high pressures and high volumetric efficiency. They do not offer speed-independent adjustment of the geometry, but they have a dirt-resistant, robust rotary piston mechanism that does not require filigree elements such as locking slides or the like. As a result, mechanically driven screw pumps have so far mainly been used in large-scale applications, such as oil pumps in stationary systems or ship engines, in which they run at relatively constant operating points.
  • the DE 10 2015 101 443 B3 describes a fuel pump with a housing in which an electric drive motor is coupled to a screw pump. The fuel flows through the drive motor before leaving the outlet on the pressure side.
  • the WO 2014/138519 A1 discloses a screw type electric fluid pump.
  • the fluid flowing through an inlet and an outlet also surrounds the motor.
  • a fuel is mentioned as a liquid.
  • a flange plane which is drawn in the illustrated construction between a motor-side housing part and a pump-side housing part, runs between the motor and a pump-side outlet.
  • the DE 10 2017 210 771 A1 shows an electrically driven screw pump as a fuel delivery unit.
  • a pump housing and an electric motor are accommodated in a casing.
  • the electrical components of the motor are in direct contact with the fuel within an outlet guide on a pressure side of the spindle chamber.
  • the pumps mentioned above cannot be transferred to an application as an electric water pump, in particular not as an electric coolant pump.
  • a liquid conveying medium such as a coolant would cause corrosive damage to the exposed components of the electric motor, in particular the coil windings of the stator.
  • the US 6,371,744 B1 describes a screw type electric vacuum pump.
  • the screw spindles are driven by an electric motor that is located in a separate housing.
  • the WO2017/059501 A1 describes a screw compressor with an intermediate housing for a gearbox.
  • a setpoint temperature of a coolant may be in the range of the boiling temperature of the coolant. In this case, overheating damage to electrical or electronic components would occur in continuous operation.
  • one object of the present invention is to create an electric screw pump that is suitable for pumping corrosive, liquid media and cooling of the provides electric drive.
  • a further partial aspect of the task consists in providing a corresponding technical solution in such a way that it can also be implemented cost-effectively in series production of large quantities.
  • the electric screw spindle coolant pump according to the invention for conveying a coolant circuit is characterized in particular by the fact that a motor housing comprises a motor chamber in which a dry-running electric motor is arranged, separated from the conveying flow; and that the motor housing has a heat transfer section through which the delivery flow flows, which is arranged between the motor chamber and a component boundary of the motor housing to a spindle housing.
  • the invention provides for the first time a screw pump as a coolant pump.
  • the invention provides for the first time a screw spindle pump as an electric liquid pump which is driven by a dry-running electric motor.
  • the invention provides for the first time a screw spindle pump as an electric liquid pump in which a convection-assisted heat transfer from a dry motor chamber to a delivery flow of the liquid delivery medium is provided.
  • a coolant pump with a high power density is created by the present invention.
  • the screw pump provides the high delivery pressure of a positive displacement pump, but with a relatively low pulsation, similar to that of a centrifugal pump.
  • the screw pump enables universal installations and applications.
  • the electric screw spindle coolant pump according to the invention is suitable, for example, for use in electric, in particular battery-electric vehicles, in which no mechanical drive source is provided and a branched structure of thin or capillary cooling channels in a battery module or a traction motor requires a high delivery pressure.
  • the invention is based on a principle of shifting an axial position of a component boundary between a motor housing and a spindle housing from a conventional functional position further in the direction of the spindle chamber.
  • this creates an area that is protected from the liquid in the delivery flow, so that the electric drive is not exposed to any corrosive influences.
  • the heat transfer section creates a liquid-conducting area on the motor housing, which increases an internal thermal contact area with the coolant. Even with a small temperature difference between the electric drive and the coolant, waste heat from electrical power loss can be effectively removed from the pump via a heat exchange on the resulting thermal contact surface of the heat-conducting motor housing and convection of the flow.
  • the increase in the thermal contact area is achieved without a higher complexity of the structure, such as in the form of surface-enlarging structures, flow resistances or the like.
  • the motor housing is designed as a cast part in product development.
  • the changed component limit can be implemented on the pump structure according to the invention without any significant effort or increase in production costs. Due to a complementary relocation of the component boundary of the spindle housing, there is essentially no disadvantageous increase in the overall dimensions of the pump, despite an increased axial dimension of the motor housing.
  • the heat transfer section may further include the pump outlet.
  • the flow cross-section of the entire flow is guided past the motor chamber.
  • the inner surface of the pump outlet at the heat transfer section increases the thermal contact surface of the thermally conductive motor housing with the delivery flow again considerably.
  • the heat transfer section may include a flow chamber that establishes communication between the end boundary of the motor chamber and the spindle chamber.
  • the heat transfer portion may include a bearing seat for a shaft bearing disposed between the electric motor and the screw rods.
  • the surface of the bearing seat in the heat transfer section in turn increases the thermal contact area of the thermally conductive motor housing with the flow.
  • the integration of a shaft bearing in the axial area of the heat transfer section promotes a compact construction of the pump.
  • electronics for the electric motor can also be arranged in the motor chamber. Accordingly, a further heat source is included in the cooling of the electric drive according to the invention. In this way, the power loss from power electronics is also dissipated via the flow.
  • a stator and/or electronics of the electric motor in the motor housing can be in contact with a front-side delimitation of the motor chamber. This ensures that the heat transfer distance of the thermally conductive motor housing between the electrical heat sources in the motor chamber and the flow is as short as possible.
  • the heat transfer portion may be formed integrally with the motor housing. This ensures an optimized heat transfer path without boundary surfaces or gaps in the material and the lowest possible manufacturing costs for the motor housing.
  • the spindle housing can be designed in one piece. As explained above, the shifting of the component boundary between the motor housing and the spindle housing results in an open cross-section of the spindle chamber. As a result, no division into two halves of the housing is required either for assembly of the pump or for the production of the shaped body of the spindle housing.
  • the one-piece design of the spindle housing ensures a smooth inner contour of the spindle chamber without the need for post-processing.
  • the inner contour of the spindle chamber can be produced simply and precisely by drilling.
  • the spindle housing may include the pump inlet.
  • the spindle housing is designed as a cast part in product development. Consequently, by integrating the pump inlet, the number of components of the pump structure according to the invention can be reduced without significant effort.
  • a flange connection made up of a flange section of the motor housing and a flange section of the spindle housing can be formed at the component boundary between the motor housing and the spindle housing.
  • the flange connection enables a preferred screw connection for assembling the two housing components, while a corresponding flange level allows different types of sealing.
  • screw pump is understood to mean helical geared rotary piston pumps with a thread pitch for displacement of the pumped medium.
  • Such types of pumps usually comprise a driven screw spindle 2a and at least one further screw spindle 2b, which is dragged along by engagement of the gearing.
  • the spindle chamber 10 has a cross-sectional contour in the form of a so-called aft housing, ie it is formed by two bores in the pump housing 1, the radii of which overlap in order to ensure engagement of the screw spindles 2a, 2b.
  • the driven screw spindle 2a is connected to an electric motor 4 .
  • a rotational movement of engaged screw profiles of the rotating screw spindles 2a, 2b generates a negative pressure on the suction side of the spindle chamber 10 and an overpressure on the opposite pressure side of the spindle chamber 10.
  • the conveyed medium is conveyed by a continuous displacement along a screw pitch of the engaged screw profiles and is expelled from the spindle chamber 10 through the pump outlet 13 .
  • a motor housing 3 adjoins the spindle housing on the pressure side of the spindle chamber 10 .
  • the motor housing 3 has a flange section 35 which is designed to match a flange section 15 of the spindle housing 1 .
  • the flange connection is sealed with a gasket.
  • a separate motor chamber 30 is formed in the motor housing 3, in which the dry-running electric motor 4 and electronics, in particular power electronics (not shown) for switching the electrical power on the electric motor 4, are accommodated. an open one
  • the end of motor chamber 30 is closed off by a motor cover (not shown).
  • a collar-shaped bearing seat 32 with a through-opening in a front-side boundary of the motor chamber 30 is formed in the motor housing 3 .
  • a common shaft bearing 23 of the electric motor 4 and the driven screw spindle 2a is fitted in the bearing seat 32 .
  • a shaft seal 34 is fitted into the bearing seat 32, which seals the motor chamber 30 from liquid ingress.
  • the dry electric motor 4 is an inner rotor type having an inner rotor 42 and an outer stator 41.
  • the rotor 42 is coupled to the driven screw rod 2a.
  • the stator 41 includes field coils that are controlled by the power electronics and supplied with electrical power.
  • the stator 41 of the electric motor 4 is in thermal contact with an inner peripheral surface and with a front boundary surface of the motor chamber 30 , so that waste heat from the field coils of the stator 41 is transferred to the motor housing 3 .
  • the motor case 3 is made of a metallic material having good thermal conductivity, such as aluminum alloy casting, and is formed as a one-piece cast molding.
  • a heat transfer section 31 of the motor housing 3 extends in an axial section between the motor chamber 30 and the flange section 35.
  • the pump outlet 13 is arranged in the form of a radially discharging pressure connection between the motor chamber 30 and the spindle chamber 10.
  • a delivery flow chamber 33 through which the liquid delivery medium flows is formed within the heat transfer section 31 .
  • the delivery flow chamber 33 establishes a connection between the pressure side of the spindle chamber 10 and the pump outlet 13 for the delivery flow of the pump.
  • the delivery flow chamber 33 surrounds the collar-shaped bearing seat 32 and guides the pressurized, liquid delivery medium to the end boundary of the motor chamber 30, with which the stator 41 is in thermal contact.
  • the heat transfer section 31 represents that area of the thermally conductive material volume on the motor housing 3 which is decisively involved in dissipating waste heat from the motor chamber 30 into the flow.
  • the inner surface of the pump outlet 13, the inner surface of the flow chamber 33 and the surface of the bearing seat 32 each contribute to an increase in the thermal contact area between the motor chamber 30 and the flow within the heat transfer section 31.
  • a temperature difference between a coolant and the engine chamber 30 is limited by the optimized heat transfer.
  • a critical component temperature of the electric drive at which overheating damage to the winding insulation of the stator 41 or the electronics can occur, is reliably prevented even under high loads with a high operating temperature of a coolant circuit.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)

Description

Die vorliegende Erfindung betrifft eine elektrische Kühlmittelpumpe vom Typ einer Schraubenspindelpumpe zum Fördern eines Kühlmittelkreislaufs oder dergleichen, insbesondere zum Fördern von korrosiven, flüssigen Medien.The present invention relates to an electric coolant pump of a screw pump type for pumping a coolant circuit or the like, particularly for pumping corrosive liquid media.

Schraubenspindelpumpen sind Verdrängerpumpen, die hohe Drücke und eine hohe volumetrische Effizienz ermöglichen. Sie bieten keine drehzahlunabhängige Verstellung der Geometrie, allerdings weisen sie eine verschmutzungsunempfindliche, robuste Drehkolbenmechanik auf, die ohne filigrane Elemente wie Sperrschieber oder dergleichen auskommt. Demzufolge fanden mechanisch angetriebene Schraubenspindelpumpen bislang vornehmlich Einsatz in großdimensionierten Anwendungen, wie z.B. Ölpumpen in stationären Anlagen oder Schiffsmotoren, in denen sie bei relativ konstanten Betriebspunkten laufen.Screw pumps are positive displacement pumps that allow high pressures and high volumetric efficiency. They do not offer speed-independent adjustment of the geometry, but they have a dirt-resistant, robust rotary piston mechanism that does not require filigree elements such as locking slides or the like. As a result, mechanically driven screw pumps have so far mainly been used in large-scale applications, such as oil pumps in stationary systems or ship engines, in which they run at relatively constant operating points.

Im Bereich der Kraftstoffförderpumpen von Fahrzeugen sind in letzter Zeit kleiner dimensionierte, elektrisch angetriebene Schraubenspindelpumpen bekannt geworden, die höhere Drücke als Kreiselpumpen ermöglichen. Diese werden in einer Tauchanordnung im Fahrzeugtank installiert und stellen in der Kraftstoffstrecke einen hohen Eingangsdruck vor der Hochdruckpumpe bzw. Einspritzpumpe bereit. Der elektrische Antrieb derartiger Kraftstoffförderpumpen ist als nasslaufender Elektromotor ohne Spalttopf ausgeführt, sodass sowohl der Rotor als auch der Stator mit dem Kraftstoff in Kontakt stehen. Die Temperatur des aus dem Tank geförderten Kraftstoffs entspricht in der Regel einer Umgebungstemperatur des Fahrzeugs. Infolgedessen wird der Antrieb, der sich aus elektrischer Verlustleistung erwärmt, in derartigen Kraftstoffförderpumpen problemlos gekühlt.In the area of fuel delivery pumps for vehicles, smaller-sized, electrically driven screw pumps have recently become known, which allow higher pressures than centrifugal pumps. These are installed in an immersion arrangement in the vehicle tank and provide a high inlet pressure in the fuel line in front of the high-pressure pump or injection pump. The electric drive of such fuel feed pumps is designed as a wet-running electric motor without a containment shell, so that both the rotor and the stator are in contact with the fuel. The temperature of the fuel delivered from the tank generally corresponds to an ambient temperature of the vehicle. As a result, the drive, which heats up from electrical power loss, is easily cooled in such fuel feed pumps.

So beschreibt die US 2018/0216614 A1 eine Schraubenspindelpumpe, die als Kraftstoffpumpe vorgesehen ist. An einem Gehäuse der Schraubenspindelpumpe ist eine Abdeckung mit einem axialen Auslass angebracht. Der elektrische Motor ist in einer Auslasskammer der Abdeckung aufgenommen und wird von dem Kraftstoff durchströmt bevor er den Auslass verlässt.That's how she describes it U.S. 2018/0216614 A1 a screw pump provided as a fuel pump. On a housing of the screw pump is a Cover fitted with an axial outlet. The electric motor is accommodated in an outlet chamber of the cover and the fuel flows through it before it leaves the outlet.

Die DE 10 2015 101 443 B3 beschreibt eine Kraftstoffpumpe mit einem Gehäuse, in dem ein elektrischer Antriebsmotor mit einer Schraubenspindelpumpe gekoppelt ist. Der Kraftstoff durchströmt den Antriebsmotor bevor er den druckseitigen Auslass verlässt.The DE 10 2015 101 443 B3 describes a fuel pump with a housing in which an electric drive motor is coupled to a screw pump. The fuel flows through the drive motor before leaving the outlet on the pressure side.

Die WO 2014/138519 A1 offenbart eine elektrische Flüssigkeitspumpe vom Schraubenspindeltyp. Die Flüssigkeit, die durch einen Einlass und einen Auslass fließt, umgibt auch den Motor. Als Flüssigkeit wird ein Kraftstoff genannt. Eine Flanschebene, die in der dargestellten Konstruktion zwischen einem motorseitigen Gehäuseteil und einem pumpenseitigen Gehäuseteil eingezeichnet ist, verläuft zwischen dem Motor und einem pumpenseitigen Auslass.The WO 2014/138519 A1 discloses a screw type electric fluid pump. The fluid flowing through an inlet and an outlet also surrounds the motor. A fuel is mentioned as a liquid. A flange plane, which is drawn in the illustrated construction between a motor-side housing part and a pump-side housing part, runs between the motor and a pump-side outlet.

Die DE 10 2017 210 771 A1 zeigt eine elektrisch angetriebene Schraubenspindelpumpe als Kraftstoffförderaggregat. Ein Pumpengehäuse und ein Elektromotor sind in einem Mantel aufgenommen. In der dargestellten Ausführung, die keinen Spalttopf am Stator des Elektromotors aufweist, stehen die elektrischen Bauteile des Motors innerhalb einer Auslassführung auf einer Druckseite der Spindelkammer in direktem Kontakt mit dem Kraftstoff.The DE 10 2017 210 771 A1 shows an electrically driven screw pump as a fuel delivery unit. A pump housing and an electric motor are accommodated in a casing. In the illustrated embodiment, which does not have a containment can on the stator of the electric motor, the electrical components of the motor are in direct contact with the fuel within an outlet guide on a pressure side of the spindle chamber.

Die obengenannten Pumpen sind jedoch nicht auf eine Anwendung als elektrische Wasserpumpe, insbesondere nicht als elektrische Kühlmittelpumpe übertragbar. Ein flüssiges Fördermedium wie ein Kühlmittel würde die freiliegenden Bauteile des Elektromotors, insbesondere die Spulenwicklungen des Stators korrosiv schädigen.However, the pumps mentioned above cannot be transferred to an application as an electric water pump, in particular not as an electric coolant pump. A liquid conveying medium such as a coolant would cause corrosive damage to the exposed components of the electric motor, in particular the coil windings of the stator.

Die US 6,371,744 B1 beschreibt eine elektrische Vakuumpumpe vom Schraubenspindeltyp. Die Schraubenspindeln werden von einem Elektromotor angetrieben, der in einem separaten Gehäuse angeordnet ist.The US 6,371,744 B1 describes a screw type electric vacuum pump. The screw spindles are driven by an electric motor that is located in a separate housing.

Die WO2017/059501 A1 beschreibt einen Schraubenverdichter mit einem Zwischengehäuse für ein Getriebe.The WO2017/059501 A1 describes a screw compressor with an intermediate housing for a gearbox.

Unabhängig von spezifischen Modifikationen zwischen einer Schraubenspindelpumpe für Gase und einer solchen für Flüssigkeiten, wäre die genannte Vakuumpumpe nicht auf eine Anwendung als elektrische Kühlmittelpumpe übertragbar. Bei der dargestellten Anordnung könnte keine ausreichende Kühlung eines trockenlaufenden Elektromotors sichergestellt werden. In einem unter Druck stehenden Kühlmittelkreislauf kann eine Solltemperatur eines Kühlmittels in dem Bereich der Siedetemperatur des Kühlmittels liegen. In diesem Fall würde es im Dauerbetrieb zu Überhitzungsschäden von elektrischen oder elektronischen Bauteilen kommen.Irrespective of specific modifications between a screw pump for gases and one for liquids, the vacuum pump mentioned would not be transferrable to an application as an electric coolant pump. With the arrangement shown, adequate cooling of a dry-running electric motor could not be ensured. In a pressurized coolant circuit, a setpoint temperature of a coolant may be in the range of the boiling temperature of the coolant. In this case, overheating damage to electrical or electronic components would occur in continuous operation.

Ausgehend von den bekannten elektrischen Schraubenspindelpumpen aus dem Stand der Technik, die nicht für eine Anwendung als Kühlmittelpumpe geeignet sind, besteht eine Aufgabe der vorliegenden Erfindung darin, eine elektrische Schraubenspindelpumpe zu schaffen, die zum Fördern von korrosiven, flüssigen Medien geeignet ist und eine Kühlung des elektrischen Antriebs bereitstellt.Based on the known electric screw pumps from the prior art, which are not suitable for use as a coolant pump, one object of the present invention is to create an electric screw pump that is suitable for pumping corrosive, liquid media and cooling of the provides electric drive.

Ein weiterer Teilaspekt der Aufgabenstellung besteht ferner darin, eine entsprechende technische Lösung derart bereitzustellen, dass sie sich auch in einer Serienfertigung von großen Stückzahlen kostengünstig realisieren lässt.A further partial aspect of the task consists in providing a corresponding technical solution in such a way that it can also be implemented cost-effectively in series production of large quantities.

Die Aufgabe wird durch die Merkmale des Anspruchs 1 gelöst. Die erfindungsgemäße elektrische Schraubenspindel-Kühlmittelpumpe zur Förderung eines Kühlmittelkreislaufs zeichnet sich insbesondere dadurch aus, dass ein Motorgehäuse eine Motorkammer umfasst, in der ein trockenlaufender Elektromotor zu dem Förderstrom abgegrenzt angeordnet ist; und dass das Motorgehäuse einen von dem Förderstrom durchflossenen Wärmeübergangsabschnitt aufweist, der zwischen der Motorkammer und einer Bauteilgrenze des Motorgehäuses zu einem Spindelgehäuse angeordnet ist.The object is solved by the features of claim 1. The electric screw spindle coolant pump according to the invention for conveying a coolant circuit is characterized in particular by the fact that a motor housing comprises a motor chamber in which a dry-running electric motor is arranged, separated from the conveying flow; and that the motor housing has a heat transfer section through which the delivery flow flows, which is arranged between the motor chamber and a component boundary of the motor housing to a spindle housing.

Somit sieht die Erfindung erstmals eine Schraubenspindelpumpe als Kühlmittelpumpe vor.Thus, the invention provides for the first time a screw pump as a coolant pump.

Ferner sieht die Erfindung erstmals eine Schraubenspindelpumpe als eine elektrische Flüssigkeitspumpe vor, die von einem trockenlaufenden Elektromotor angetrieben wird.Furthermore, the invention provides for the first time a screw spindle pump as an electric liquid pump which is driven by a dry-running electric motor.

Darüber hinaus sieht die Erfindung erstmals eine Schraubenspindelpumpe als eine elektrische Flüssigkeitspumpe vor, in der ein konvektionsunterstützter Wärmeübergang von einer trockenen Motorkammer auf einen Förderstrom des flüssigen Fördermediums bereitgestellt ist.In addition, the invention provides for the first time a screw spindle pump as an electric liquid pump in which a convection-assisted heat transfer from a dry motor chamber to a delivery flow of the liquid delivery medium is provided.

Durch die vorliegende Erfindung wird eine Kühlmittelpumpe mit einer hohen Leistungsdichte geschaffen. Die Schraubenspindelpumpe verschafft den hohen Förderdruck einer Verdrängerpumpe, allerdings bei einer relativ geringen Pulsation, ähnlich wie bei einer Kreiselpumpe. In Verbindung mit einem elektrischen Antrieb ermöglicht die Schraubenspindelpumpe universelle Installationen und Anwendungen. Die erfindungsgemäße elektrische Schraubenspindel-Kühlmittelpumpe eignet sich beispielsweise zum Einsatz in elektrischen, insbesondere batterieelektrischen Fahrzeugen, in denen keine mechanische Antriebsquelle bereitgestellt ist, und eine verzweigte Struktur von dünnen bzw. kapillaren Kühlkanälen in einem Batteriemodul oder einem Traktionsmotor einen hohen Förderdruck erfordert.A coolant pump with a high power density is created by the present invention. The screw pump provides the high delivery pressure of a positive displacement pump, but with a relatively low pulsation, similar to that of a centrifugal pump. In conjunction with an electric drive, the screw pump enables universal installations and applications. The electric screw spindle coolant pump according to the invention is suitable, for example, for use in electric, in particular battery-electric vehicles, in which no mechanical drive source is provided and a branched structure of thin or capillary cooling channels in a battery module or a traction motor requires a high delivery pressure.

In konstruktiver Hinsicht liegt der Erfindung ein Prinzip zugrunde, eine axiale Position einer Bauteilgrenze zwischen einem Motorgehäuse und einem Spindelgehäuse, von einer herkömmlichen funktionalen Position weiter in Richtung der Spindelkammer zu verlegen. Dadurch wird einerseits ein vor der Flüssigkeit des Förderstroms geschützter Bereich geschaffen, sodass der elektrische Antrieb keinen korrosiven Einflüssen ausgesetzt ist. Andererseits wird durch den Wärmeübergangsabschnitt ein flüssigkeitsführender Bereich an dem Motorgehäuse geschaffen, der eine innenliegende thermische Kontaktfläche mit dem Kühlmittel vergrößert. Über einen Wärmeaustausch an der so entstandenen thermischen Kontaktfläche des wärmeleitenden Motorgehäuses sowie einer Konvektion des Förderstroms, kann selbst bei einer geringen Temperaturdifferenz zwischen dem elektrischen Antrieb und dem Kühlmittel Abwärme aus elektrischer Verlustleistung effektiv aus der Pumpe abtransportiert werden.In terms of construction, the invention is based on a principle of shifting an axial position of a component boundary between a motor housing and a spindle housing from a conventional functional position further in the direction of the spindle chamber. On the one hand, this creates an area that is protected from the liquid in the delivery flow, so that the electric drive is not exposed to any corrosive influences. On the other hand, the heat transfer section creates a liquid-conducting area on the motor housing, which increases an internal thermal contact area with the coolant. Even with a small temperature difference between the electric drive and the coolant, waste heat from electrical power loss can be effectively removed from the pump via a heat exchange on the resulting thermal contact surface of the heat-conducting motor housing and convection of the flow.

Die Vergrößerung der thermischen Kontaktfläche wird ohne eine höhere Komplexität des Aufbaus, wie in Form von oberflächenvergrößernden Strukturen, Strömungswiderständen oder dergleichen erzielt. Das Motorgehäuse wird in der Produktentwicklung als Gussteil entworfen. Demzufolge kann die geänderte Bauteilgrenze ohne nennenswerten Aufwand oder Erhöhung der Fertigungskosten an dem erfindungsgemäßen Pumpenaufbau umgesetzt werden. Aufgrund einer komplementären Verlegung der Bauteilgrenze des Spindelgehäuses entsteht trotz einer vergrößerten axialen Abmessung des Motorgehäuses im Wesentlichen keine nachteilige Vergrößerung der Gesamtabmessung der Pumpe.The increase in the thermal contact area is achieved without a higher complexity of the structure, such as in the form of surface-enlarging structures, flow resistances or the like. The motor housing is designed as a cast part in product development. As a result, the changed component limit can be implemented on the pump structure according to the invention without any significant effort or increase in production costs. Due to a complementary relocation of the component boundary of the spindle housing, there is essentially no disadvantageous increase in the overall dimensions of the pump, despite an increased axial dimension of the motor housing.

Im Vergleich zu einem bekannten Pumpenaufbau mit einem im Förderstrom freiliegenden, nasslaufenden elektrischen Antrieb, werden Strömungsverluste in der Pumpe deutlich verringert.Flow losses in the pump are significantly reduced compared to a known pump design with an exposed, wet-running electric drive in the flow.

Im Zuge der erläuterten Verlegung der Bauteilgrenze entsteht am Ende des Spindelgehäuses ein offener Querschnitt der Spindelkammer. Daher können die Schraubenspindeln bei der Montage der Pumpe einfach durch das offene Ende der Spindelkammer eingeführt werden.In the course of the explained relocation of the component boundary, an open cross-section of the spindle chamber is created at the end of the spindle housing. Therefore, when assembling the pump, the screw rods can simply be inserted through the open end of the screw chamber.

Vorteilhafte Weiterbildungen der Erfindung sind Gegenstand der abhängigen Ansprüche.Advantageous developments of the invention are the subject matter of the dependent claims.

Gemäß einem Aspekt der Erfindung kann der Wärmeübergangsabschnitt ferner den Pumpenauslass umfassen. Dadurch wird der Strömungsquerschnitt des gesamten Förderstroms an der Motorkammer vorbei geführt. Die Innenfläche des Pumpenauslasses an dem Wärmeübergangsabschnitt vergrößert die thermische Kontaktfläche des wärmeleitfähigen Motorgehäuses mit dem Förderstrom nochmals erheblich.According to an aspect of the invention, the heat transfer section may further include the pump outlet. As a result, the flow cross-section of the entire flow is guided past the motor chamber. The inner surface of the pump outlet at the heat transfer section increases the thermal contact surface of the thermally conductive motor housing with the delivery flow again considerably.

Gemäß einem Aspekt der Erfindung kann der Wärmeübergangsabschnitt eine Förderstromkammer umfassen, die eine Verbindung zwischen der stirnseitigen Abgrenzung der Motorkammer und der Spindelkammer herstellt. Durch diese Ausgestaltung wird die Wärmeübergangsstrecke des wärmeleitfähigen Motorgehäuses zwischen den elektrischen Wärmequellen in der Motorkammer und dem Förderstrom weiter verkürzt. Ferner vergrößert die Innenfläche der Förderstromkammer in dem Wärmeübergangsabschnitt weiterhin die thermische Kontaktfläche des wärmeleitfähigen Motorgehäuses mit dem Förderstrom.According to one aspect of the invention, the heat transfer section may include a flow chamber that establishes communication between the end boundary of the motor chamber and the spindle chamber. Through this Configuration, the heat transfer path of the thermally conductive motor housing between the electrical heat sources in the motor chamber and the flow rate is further reduced. Furthermore, the inner surface of the flow chamber in the heat transfer section further increases the thermal contact area of the thermally conductive motor housing with the flow.

Gemäß einem Aspekt der Erfindung kann der Wärmeübergangsabschnitt einen Lagersitz für ein Wellenlager umfassen, das zwischen dem Elektromotor und den Schraubenspindeln angeordnet ist. Die Oberfläche des Lagersitzes in dem Wärmeübergangsabschnitt vergrößert wiederum die thermische Kontaktfläche des wärmeleitfähigen Motorgehäuses mit dem Förderstrom. Darüber hinaus begünstigt die Integration eines Wellenlagers in dem axialen Bereich des Wärmeübergangsabschnitts eine kompakte Bauweise der Pumpe.According to an aspect of the invention, the heat transfer portion may include a bearing seat for a shaft bearing disposed between the electric motor and the screw rods. The surface of the bearing seat in the heat transfer section in turn increases the thermal contact area of the thermally conductive motor housing with the flow. In addition, the integration of a shaft bearing in the axial area of the heat transfer section promotes a compact construction of the pump.

Gemäß einem Aspekt der Erfindung kann auch eine Elektronik für den Elektromotor in der Motorkammer angeordnet sein. Demnach wird eine weitere Wärmequelle in die erfindungsgemäße Kühlung des elektrischen Antriebs aufgenommen. Auf diese Weise wird auch die Verlustleistung aus einer Leistungselektronik über den Förderstrom abgeführt.According to one aspect of the invention, electronics for the electric motor can also be arranged in the motor chamber. Accordingly, a further heat source is included in the cooling of the electric drive according to the invention. In this way, the power loss from power electronics is also dissipated via the flow.

Gemäß einem Aspekt der Erfindung können ein Stator und/oder eine Elektronik des Elektromotors in dem Motorgehäuse mit einer stirnseitigen Abgrenzung der Motorkammer in Kontakt stehen. Somit wird eine möglichst kurze Wärmeübergangsstrecke des wärmeleitfähigen Motorgehäuses zwischen den elektrischen Wärmequellen in der Motorkammer und dem Förderstrom sichergestellt.According to one aspect of the invention, a stator and/or electronics of the electric motor in the motor housing can be in contact with a front-side delimitation of the motor chamber. This ensures that the heat transfer distance of the thermally conductive motor housing between the electrical heat sources in the motor chamber and the flow is as short as possible.

Gemäß einem Aspekt der Erfindung kann der Wärmeübergangsabschnitt einteilig mit dem Motorgehäuse ausgebildet sein. Dadurch werden eine optimierte Wärmeübergangsstrecke ohne Grenzflächen oder Fugen im Material sowie möglichst geringe Herstellungskosten des Motorgehäuses sichergestellt.According to an aspect of the invention, the heat transfer portion may be formed integrally with the motor housing. This ensures an optimized heat transfer path without boundary surfaces or gaps in the material and the lowest possible manufacturing costs for the motor housing.

Gemäß einem Aspekt der Erfindung kann das Spindelgehäuse einteilig ausgebildet sein. Wie zuvor erläutert, entsteht durch die Verlegung der Bauteilgrenze zwischen dem Motorgehäuse und dem Spindelgehäuse ein offener Querschnitt der Spindelkammer. Dadurch ist sowohl zur Montage der Pumpe als auch zur Fertigung des Formkörpers des Spindelgehäuses keine Teilung in zwei Gehäusehälften erforderlich. Die einteilige Ausführung des Spindelgehäuses stellt ohne erforderliche Nachbearbeitung eine stoßfreie Innenkontur der Spindelkammer sicher. Die Innenkontur der Spindelkammer kann einfach und präzise durch Bohrungen hergestellt werden.According to one aspect of the invention, the spindle housing can be designed in one piece. As explained above, the shifting of the component boundary between the motor housing and the spindle housing results in an open cross-section of the spindle chamber. As a result, no division into two halves of the housing is required either for assembly of the pump or for the production of the shaped body of the spindle housing. The one-piece design of the spindle housing ensures a smooth inner contour of the spindle chamber without the need for post-processing. The inner contour of the spindle chamber can be produced simply and precisely by drilling.

Gemäß einem Aspekt der Erfindung kann das Spindelgehäuse den Pumpeneinlass umfassen. Das Spindelgehäuse wird in der Produktentwicklung als Gussteil entworfen. Demzufolge kann durch die Integration des Pumpeneinlasses, die Anzahl der Bauteile des erfindungsgemäßen Pumpenaufbaus ohne nennenswerten Aufwand verringert werden.According to one aspect of the invention, the spindle housing may include the pump inlet. The spindle housing is designed as a cast part in product development. Consequently, by integrating the pump inlet, the number of components of the pump structure according to the invention can be reduced without significant effort.

Gemäß einem Aspekt der Erfindung kann an der Bauteilgrenze zwischen dem Motorgehäuse und dem Spindelgehäuse eine Flanschverbindung aus einem Flanschabschnitt des Motorgehäuses und einem Flanschabschnitt des Spindelgehäuses ausgebildet sein. Die Flanschverbindung ermöglicht eine bevorzugte Schraubverbindung zur Montage der beiden Gehäusebauteile, während eine entsprechende Flanscheben verschiedene Arten der Abdichtung zulässt.According to one aspect of the invention, a flange connection made up of a flange section of the motor housing and a flange section of the spindle housing can be formed at the component boundary between the motor housing and the spindle housing. The flange connection enables a preferred screw connection for assembling the two housing components, while a corresponding flange level allows different types of sealing.

Die Erfindung wird nachfolgend anhand einer Ausführungsform mit Bezug auf die begleitende Zeichnung beschrieben.

Fig. 1
zeigt eine schematische Schnittansicht durch eine Schraubenspindel-Kühlmittelpumpe gemäß einer Ausführungsform der Erfindung.
The invention is described below using an embodiment with reference to the accompanying drawing.
1
Figure 12 shows a schematic sectional view through a twin screw coolant pump according to an embodiment of the invention.

Unter dem Begriff Schraubenspindelpumpe werden im Sinne dieser Offenbarung schrägverzahnte Rotationskolbenpumpen mit einer Gewindesteigung zur Verdrängung des Fördermediums verstanden. Derartige Pumpentypen umfassen in der Regel eine angetriebene Schraubenspindel 2a und wenigstens eine weitere Schraubenspindel 2b, die über einen Eingriff der Verzahnung mitgeschleppt wird.In the context of this disclosure, the term screw pump is understood to mean helical geared rotary piston pumps with a thread pitch for displacement of the pumped medium. Such types of pumps usually comprise a driven screw spindle 2a and at least one further screw spindle 2b, which is dragged along by engagement of the gearing.

In der Ausführungsform der schematischen Darstellung aus Fig. 1 sind in einem Spindelgehäuse 1 eine angetriebene Schraubenspindel 2a und eine mitgeschleppte Schraubenspindel 2b in einer Spindelkammer 10 des Spindelgehäuses 1 drehbar gelagert aufgenommen. Die Spindelkammer 10 weist eine Querschnittskontur in der Form eines sogenannten Achtergehäuses auf, d.h. sie wird durch zwei Bohrungen im Pumpengehäuse 1 gebildet, deren Radien sich überschneiden, um einen Eingriff der Schraubenspindeln 2a, 2b zu gewährleisten. Die angetriebene Schraubenspindel 2a steht mit einem Elektromotor 4 in Verbindung.In the embodiment of the schematic diagram 1 are in a spindle housing 1, a driven screw spindle 2a and an entrained screw spindle 2b rotatably accommodated in a spindle chamber 10 of the spindle housing 1. The spindle chamber 10 has a cross-sectional contour in the form of a so-called aft housing, ie it is formed by two bores in the pump housing 1, the radii of which overlap in order to ensure engagement of the screw spindles 2a, 2b. The driven screw spindle 2a is connected to an electric motor 4 .

Zu der Antriebsseite der Schraubenspindeln 2a, 2b befindet sich eine Druckseite der Spindelkammer 10, die mit einem Pumpenauslass 13 in Form eines Druckstutzens in Verbindung steht. Zu der anderen Seite der Schraubenspindeln 2a, 2b, die dem Elektromotor 4 gegenüberliegt, befindet sich eine Saugseite der Spindelkammer 10. Die Saugseite der Spindelkammer 10 steht mit einem Pumpeneinlass 11 in Form eines Saugstutzens in Verbindung. In Betrachtung der Förderrichtung der Schraubenspindelpumpe, wird ein flüssiges Fördermedium bzw. ein Kühlmittel aus einem Kühlmittelkreislauf durch den Pumpeneinlass 11 auf der Saugseite in die Spindelkammer 10 eingesaugt. Eine Drehbewegung von in Eingriff stehenden Schraubenprofilen der drehenden Schraubenspindeln 2a, 2b erzeugt auf der Saugseite der Spindelkammer 10 einen Unterdruck und auf der gegenüberliegenden Druckseite der Spindelkammer 10 einen Überdruck. Das Fördermedium wird durch eine kontinuierliche Verdrängung entlang einer Schraubensteigung der in Eingriff stehenden Schraubenprofile gefördert und durch den Pumpenauslass 13 aus der Spindelkammer 10 ausgestoßen.On the drive side of the screw spindles 2a, 2b there is a pressure side of the spindle chamber 10, which is connected to a pump outlet 13 in the form of a pressure nozzle. On the other side of the screw spindles 2a, 2b, which is opposite the electric motor 4, there is a suction side of the spindle chamber 10. The suction side of the spindle chamber 10 is connected to a pump inlet 11 in the form of a suction nozzle. Considering the conveying direction of the screw spindle pump, a liquid conveying medium or a coolant from a coolant circuit is sucked into the spindle chamber 10 through the pump inlet 11 on the suction side. A rotational movement of engaged screw profiles of the rotating screw spindles 2a, 2b generates a negative pressure on the suction side of the spindle chamber 10 and an overpressure on the opposite pressure side of the spindle chamber 10. The conveyed medium is conveyed by a continuous displacement along a screw pitch of the engaged screw profiles and is expelled from the spindle chamber 10 through the pump outlet 13 .

Zu der Druckseite der Spindelkammer 10 schließt sich ein Motorgehäuse 3 an das Spindelgehäuse an. Das Motorgehäuse 3 weist einen Flanschabschnitt 35 auf, der zu einem Flanschabschnitt 15 des Spindelgehäuses 1 passend ausgebildet ist. Die Flanschverbindung ist durch eine Dichtung abgedichtet. In dem Motorgehäuse 3 ist eine abgetrennte Motorkammer 30 ausgebildet, in welcher der trockenlaufende Elektromotor 4 und eine Elektronik, insbesondere eine Leistungselektronik (nicht dargestellt) zur Schaltung der elektrischen Leistung am Elektromotor 4 aufgenommen ist. Ein offenes Ende der Motorkammer 30 ist durch einen Motordeckel (nicht dargestellt) abgeschlossen. In dem Motorgehäuse 3 ist ein kragenförmiger Lagersitz 32 mit einer Durchtrittsöffnung in einer stirnseitigen Begrenzung der Motorkammer 30 ausgebildet. In dem Lagersitz 32 ist ein gemeinsames Wellenlager 23 des Elektromotors 4 und der angetriebenen Schraubenspindel 2a eingepasst. Vor dem Wellenlager 23 ist eine Wellendichtung 34 in den Lagersitz 32 eingepasst, der die Motorkammer 30 vor einem Flüssigkeitseintritt abdichtet.A motor housing 3 adjoins the spindle housing on the pressure side of the spindle chamber 10 . The motor housing 3 has a flange section 35 which is designed to match a flange section 15 of the spindle housing 1 . The flange connection is sealed with a gasket. A separate motor chamber 30 is formed in the motor housing 3, in which the dry-running electric motor 4 and electronics, in particular power electronics (not shown) for switching the electrical power on the electric motor 4, are accommodated. an open one The end of motor chamber 30 is closed off by a motor cover (not shown). A collar-shaped bearing seat 32 with a through-opening in a front-side boundary of the motor chamber 30 is formed in the motor housing 3 . A common shaft bearing 23 of the electric motor 4 and the driven screw spindle 2a is fitted in the bearing seat 32 . In front of the shaft bearing 23, a shaft seal 34 is fitted into the bearing seat 32, which seals the motor chamber 30 from liquid ingress.

Der trockenlaufende Elektromotor 4 ist ein Innenläufertyp mit einem innenliegenden Rotor 42 und einem außenliegenden Stator 41. Der Rotor 42 ist mit der angetriebenen Schraubenspindel 2a gekoppelt. Der Stator 41 umfasst Feldspulen, die von der Leistungselektronik angesteuert und mit elektrischer Leistung versorgt werden. Der Stator 41 des Elektromotors 4 steht mit einer innenliegenden Umfangsfläche und mit einer stirnseitigen Begrenzungsfläche der Motorkammer 30 in einem thermischen Kontakt, sodass eine Abwärme aus den Feldspulen des Stators 41 auf das Motorgehäuse 3 übertragen wird.The dry electric motor 4 is an inner rotor type having an inner rotor 42 and an outer stator 41. The rotor 42 is coupled to the driven screw rod 2a. The stator 41 includes field coils that are controlled by the power electronics and supplied with electrical power. The stator 41 of the electric motor 4 is in thermal contact with an inner peripheral surface and with a front boundary surface of the motor chamber 30 , so that waste heat from the field coils of the stator 41 is transferred to the motor housing 3 .

Das Motorgehäuse 3 besteht aus einem metallischen Material mit einer guten Wärmeleitfähigkeit, wie einer Aluminiumgusslegierung, und ist als einteiliges Gussformteil ausgebildet. In einem axialen Abschnitt zwischen der Motorkammer 30 und dem Flanschabschnitt 35 erstreckt sich ein Wärmeübergangsabschnitt 31 des Motorgehäuses 3. Als integraler Bestandteil des Wärmeübergangsabschnitts 31 ist der Pumpenauslass 13 in Form eines radial abführenden Druckstutzens zwischen der Motorkammer 30 und der Spindelkammer 10 angeordnet. Innerhalb des Wärmeübergangsabschnitts 31 ist eine Förderstromkammer 33 ausgebildet, die von dem flüssigen Fördermedium durchflossen wird. Die Förderstromkammer 33 stellt für den Förderstrom der Pumpe eine Verbindung zwischen der Druckseite der Spindelkammer 10 und dem Pumpenauslass 13 her. Die Förderstromkammer 33 umgibt den kragenförmigen Lagersitz 32 und führt das unter Druck stehende, flüssige Fördermedium an die stirnseitige Begrenzung der Motorkammer 30 heran, mit welcher der Stator 41 in einem thermischen Kontakt steht.The motor case 3 is made of a metallic material having good thermal conductivity, such as aluminum alloy casting, and is formed as a one-piece cast molding. A heat transfer section 31 of the motor housing 3 extends in an axial section between the motor chamber 30 and the flange section 35. As an integral part of the heat transfer section 31, the pump outlet 13 is arranged in the form of a radially discharging pressure connection between the motor chamber 30 and the spindle chamber 10. A delivery flow chamber 33 through which the liquid delivery medium flows is formed within the heat transfer section 31 . The delivery flow chamber 33 establishes a connection between the pressure side of the spindle chamber 10 and the pump outlet 13 for the delivery flow of the pump. The delivery flow chamber 33 surrounds the collar-shaped bearing seat 32 and guides the pressurized, liquid delivery medium to the end boundary of the motor chamber 30, with which the stator 41 is in thermal contact.

Der Wärmeübergangsabschnitt 31 stellt denjenigen Bereich des wärmeleitfähigen Materialvolumens am Motorgehäuse 3 dar, der an einer Ableitung von Abwärme aus der Motorkammer 30 in den Förderstrom maßgeblich involviert ist. Die Innenfläche des Pumpenauslasses 13, die Innenfläche der Förderstromkammer 33 und die Oberfläche des Lagersitzes 32 tragen jeweils zu einer Vergrößerung der thermischen Kontaktfläche zwischen der Motorkammer 30 und dem Förderstrom innerhalb des Wärmeübergangsabschnitts 31 bei.The heat transfer section 31 represents that area of the thermally conductive material volume on the motor housing 3 which is decisively involved in dissipating waste heat from the motor chamber 30 into the flow. The inner surface of the pump outlet 13, the inner surface of the flow chamber 33 and the surface of the bearing seat 32 each contribute to an increase in the thermal contact area between the motor chamber 30 and the flow within the heat transfer section 31.

Durch den optimierten Wärmeübergang wird eine Temperaturdifferenz zwischen einem Kühlmittel und der Motorkammer 30 begrenzt. Infolgedessen wird auch unter hohen Belastungen mit einer hohen Betriebstemperatur eines Kühlmittelkreislaufs, eine kritische Bauteiltemperatur des elektrischen Antriebs, bei der Überhitzungsschäden an Wicklungsisolationen des Stators 41 oder der Elektronik auftreten können, zuverlässig verhindert.A temperature difference between a coolant and the engine chamber 30 is limited by the optimized heat transfer. As a result, a critical component temperature of the electric drive, at which overheating damage to the winding insulation of the stator 41 or the electronics can occur, is reliably prevented even under high loads with a high operating temperature of a coolant circuit.

Bezugszeichenliste:Reference list:

11
Spindelgehäusespindle housing
2a2a
angetriebene Schraubenspindeldriven screw spindle
2b2 B
mitgeschleppte Schraubenspindelentrained screw spindle
33
Motorgehäusemotor housing
44
Elektromotorelectric motor
1010
Spindelkammerspindle chamber
1111
Pumpeneinlasspump inlet
1313
Pumpenauslasspump outlet
1515
Flanschabschnitt des SpindelgehäusesFlange section of the spindle housing
2323
Wellenlagershaft bearing
3030
Motorkammermotor chamber
3131
Wärmeübergangsabschnittheat transfer section
3232
Lagersitzbearing seat
3333
Förderstromkammerflow chamber
3434
Wellendichtungshaft seal
3535
Flanschabschnitt des MotorgehäusesFlange section of motor housing
4141
Statorstator
4242
Rotorrotor

Claims (9)

  1. An electric screw coolant pump for delivering a coolant circulation comprising:
    a spindle housing (1) having a spindle chamber (10) in which at least two screw spindles (2a, 2b) are rotatably accommodated;
    a pump inlet (11) and a pump outlet (13) for guiding a delivery flow through the spindle chamber (10);
    a motor housing (3) that is arranged axially adjacent to the spindle housing (1);
    characterized in that
    the motor housing (3) includes a motor chamber (30) in which a dry-running electric motor (4) is arranged in such a manner that it is delimited with respect to the delivery flow; and
    the motor housing (3) comprises a heat transfer section (31), through which the delivery flow flows, arranged between the motor chamber (30) and a component boundary between the motor housing (3) and the spindle housing (1).
  2. The electric screw coolant pump according to claim 1, wherein
    the heat transfer section (31) furthermore includes the pump outlet (13).
  3. The electric screw coolant pump according to claim 1 or 2, wherein
    the heat transfer section (31) includes a delivery flow chamber (33) that establishes a connection between a frontal delimitation of the motor chamber (30) and the spindle chamber (10).
  4. The electric screw coolant pump according to one of the preceding claims, wherein
    the heat transfer section (31) includes a bearing seat (32) for a shaft bearing (23) arranged between the electric motor (4) and the screw spindles (2a, 2b).
  5. The electric screw coolant pump according to one of the preceding claims, wherein
    an electronic system for the electric motor (4) is also arranged inside the motor chamber (30).
  6. The electric screw coolant pump according to one of the preceding claims, wherein
    a stator (41) and/or an electronic system of the electric motor (4) is in contact with a frontal delimitation of the motor chamber (30) inside the motor housing (3).
  7. The electric screw coolant pump according to one of the preceding claims, wherein
    the heat transfer section (31) is formed integrally with the motor housing (3).
  8. The electric screw coolant pump according to one of the preceding claims, wherein
    the spindle housing (1) is formed as one piece.
  9. The electric screw coolant pump according to one of the preceding claims, wherein
    at the component boundary between the motor housing (3) and the spindle housing (1), a flange joint is formed of a flange section (35) of the motor housing (3) and a flange section (15) of the spindle housing (1).
EP19817281.9A 2019-02-12 2019-12-09 Electrical screw spindle coolant pump Active EP3924624B1 (en)

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DE102019103470.1A DE102019103470A1 (en) 2019-02-12 2019-02-12 Electric screw spindle coolant pump
PCT/EP2019/084161 WO2020164776A1 (en) 2019-02-12 2019-12-09 Electrical screw spindle coolant pump

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EP3924624A1 EP3924624A1 (en) 2021-12-22
EP3924624B1 true EP3924624B1 (en) 2023-04-19

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US (1) US20220099088A1 (en)
EP (1) EP3924624B1 (en)
CN (1) CN113227580B (en)
BR (1) BR112021012370A2 (en)
DE (1) DE102019103470A1 (en)
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DE102019118086A1 (en) * 2019-07-04 2021-01-07 Nidec Gpm Gmbh Integrated screw spindle coolant pump
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CN113227580B (en) 2023-06-27
CN113227580A (en) 2021-08-06
DE102019103470A1 (en) 2020-08-13
EP3924624A1 (en) 2021-12-22
US20220099088A1 (en) 2022-03-31
BR112021012370A2 (en) 2021-08-31

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