EP3924624A1 - Electrical screw spindle coolant pump - Google Patents

Electrical screw spindle coolant pump

Info

Publication number
EP3924624A1
EP3924624A1 EP19817281.9A EP19817281A EP3924624A1 EP 3924624 A1 EP3924624 A1 EP 3924624A1 EP 19817281 A EP19817281 A EP 19817281A EP 3924624 A1 EP3924624 A1 EP 3924624A1
Authority
EP
European Patent Office
Prior art keywords
spindle
motor
housing
chamber
electric
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP19817281.9A
Other languages
German (de)
French (fr)
Other versions
EP3924624B1 (en
Inventor
Daniel Döhler
Franz Pawellek
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.)
Nidec GPM GmbH
Original Assignee
Nidec GPM GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nidec GPM GmbH filed Critical Nidec GPM GmbH
Publication of EP3924624A1 publication Critical patent/EP3924624A1/en
Application granted granted Critical
Publication of EP3924624B1 publication Critical patent/EP3924624B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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 the type of a screw spindle pump for conveying a coolant circuit or the like, in particular for conveying corrosive, liquid media.
  • Screw pumps are positive displacement pumps that enable high pressures and high volumetric efficiency. They do not offer any speed-independent adjustment of the geometry, but they have a robust rotary piston mechanism that is insensitive to contamination and does not require any filigree elements such as gate valves or the like.
  • 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.
  • US 2018/0216614 Al describes a screw pump that is intended as a fuel pump.
  • a Cover attached 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.
  • 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 it leaves the outlet on the pressure side.
  • WO 2014/138519 A1 discloses an electric fluid pump of the screw spindle type.
  • the liquid flowing through an inlet and an outlet also surrounds the motor.
  • a fuel is named as a liquid.
  • a flange plane which is shown in the construction shown between a housing part on the motor side and a housing part on the pump side, runs between the motor and an outlet on the pump side.
  • 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 jacket.
  • 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.
  • No. 6,371,744 B1 describes an electrical vacuum pump of the screw spindle type.
  • the screw spindles are driven by an electric motor which is arranged in a separate housing. Irrespective of specific modifications between a screw pump for gases and a screw pump for liquids, the said vacuum pump would not be transferable to an application as an electric coolant pump. With the arrangement shown, sufficient cooling of a dry-running electric motor could not be ensured.
  • a setpoint temperature of a coolant can be in the range of the boiling point of the coolant. In this case, overheating damage to electrical or electronic components would occur in continuous operation.
  • an object of the present invention is to create an electric screw pump that is suitable for pumping corrosive, liquid media and a cooling of the electrical drive provides.
  • Another aspect of the task is to provide a corresponding technical solution in such a way that it can also be implemented cost-effectively in series production of large numbers.
  • the electrical screw spindle coolant pump according to the invention for conveying a coolant circuit is particularly characterized in that a motor housing comprises a motor chamber in which a dry-running electric motor is arranged so as to be delimited from the conveying flow; and that the motor housing has a heat transfer section through which the delivery stream flows and 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 spindle pump as a coolant pump. Furthermore, the invention provides for the first time a screw spindle pump as an electric liquid pump that 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 is provided from a dry motor chamber to a conveying flow of the liquid conveying medium.
  • the present invention creates a coolant pump with a high power density.
  • the screw pump creates the high delivery pressure of a positive displacement pump, albeit with a relatively low pulsation, similar to 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, especially 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 the principle of moving 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.
  • a liquid-conducting area on the motor housing is created by the heat transfer section, which increases an internal thermal contact surface with the coolant. Via a heat exchange on the resulting thermal contact surface of the heat-conducting motor housing and a convection of the flow rate, 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.
  • the enlargement of the thermal contact surface 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 boundary 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 in spite of an enlarged axial dimension of the motor housing.
  • the heat transfer section can further comprise the pump outlet.
  • the flow cross-section of the entire delivery flow is guided past the motor chamber.
  • the inner surface of the pump outlet on the heat transfer section increases the thermal contact surface of the thermally conductive motor housing with the flow rate again considerably.
  • the heat transfer section can comprise a delivery flow chamber which establishes a connection between the frontal delimitation of the motor chamber and the spindle chamber.
  • the heat transfer section can comprise a bearing seat for a shaft bearing, which is arranged between the electric motor and the screw spindles.
  • 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 rate.
  • the integration of a shaft bearing in the axial area of the heat transfer section favors a compact design 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 conveyor stream.
  • a stator and / or electronics of the electric motor in the motor housing can be in contact with an end delimitation of the motor chamber. This ensures that the heat transfer path of the thermally conductive motor housing is as short as possible between the electrical heat sources in the motor chamber and the delivery flow.
  • the heat transfer section can be formed in one piece with the motor housing. This ensures an optimized heat transfer path without interfaces or joints 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 relocation of the component boundary between the motor housing and the spindle housing creates an open cross section of the spindle chamber. As a result, no division into two halves of the housing is required either for the assembly of the pump or for the manufacture of the molded body of the spindle housing.
  • the one-piece design of the spindle housing ensures a joint-free inner contour of the spindle chamber without the need for reworking. The inner contour of the spindle chamber can be produced easily and precisely by drilling.
  • the spindle housing can comprise the pump inlet.
  • the spindle housing is designed as a cast part during product development. Accordingly, 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 from 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 also allows different types of sealing.
  • Fig. 1 shows a schematic sectional view through a screw spindle coolant pump according to an embodiment of the invention.
  • screw pump is understood to mean helical rotary piston pumps with a thread pitch for displacing the delivery medium.
  • Such types of pumps generally include a driven screw spindle 2a and at least one further screw spindle 2b, which is dragged along by engagement of the toothing.
  • a driven screw spindle 2a and a dragged screw spindle 2b are rotatably supported in a spindle chamber 10 of the spindle housing 1 in a spindle housing 1.
  • the spindle chamber 10 has a cross-sectional contour in the form of a so-called figure eight 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 rotary movement of engaging 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 delivery 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 by a seal.
  • 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 to the electric motor 4, are accommodated.
  • An open one The end of the motor chamber 30 is closed off by a motor cover (not shown).
  • a collar-shaped bearing seat 32 with a passage opening is formed in an end-side delimitation of the motor chamber 30.
  • 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 the entry of liquid.
  • the dry-running electric motor 4 is an internal rotor type having an internal rotor 42 and an external stator 4L.
  • the rotor 42 is coupled to the driven screw spindle 2a.
  • the stator 41 comprises 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 circumferential surface and with an end-side 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 housing 3 consists of a metallic material with good thermal conductivity, such as a cast aluminum alloy, and is designed as a one-piece molded part.
  • a heat transfer section 31 of the motor housing 3 extends.
  • 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. 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 conveying flow chamber 33 surrounds the collar-shaped bearing seat 32 and guides the pressurized, liquid conveying medium to the front boundary of the motor chamber 30, with which the stator 41 is in thermal contact.
  • the heat transfer section 31 represents that region of the thermally conductive material volume on the motor housing 3 which is significantly involved in the dissipation of waste heat from the motor chamber 30 into the delivery flow.
  • the inner surface of the pump outlet 13, the inner surface of the delivery 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 delivery flow within the

Landscapes

  • 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)

Abstract

The invention relates to an electrical screw spindle coolant pump, which is suitable for conveying a coolant circuit or other corrosive, liquid media. The electrical screw spindle coolant pump has a spindle housing (1) with a spindle chamber (10) and an axially adjacent motor housing (3). The invention is characterized in that the motor housing (3) comprises a motor chamber (30), in which a dry-running electric motor (4) is arranged separated from the flow current; and the motor housing (3) has a thermal transition portion (31) through which the flow current flows, which thermal transition portion is arranged between the motor chamber (30) and a component boundary of the motor housing (3) to the spindle housing (1).

Description

Beschreibung description
Elektrische Schraubenspindel-Kühlmittelpumpe Electric screw spindle coolant pump
Die vorliegende Erfindung betrifft eine elektrische Kühlmittelpumpe vom Typ einer S chraubenspindelpumpe zum Fördern eines Kühlmittelkreislaufs oder dergleichen, insbesondere zum Fördern von korrosiven, flüssigen Medien. 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. The present invention relates to an electric coolant pump of the type of a screw spindle pump for conveying a coolant circuit or the like, in particular for conveying corrosive, liquid media. Screw pumps are positive displacement pumps that enable high pressures and high volumetric efficiency. They do not offer any speed-independent adjustment of the geometry, but they have a robust rotary piston mechanism that is insensitive to contamination and does not require any filigree elements such as gate valves 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 Kraftstoffforderpumpen von Fahrzeugen sind in letzter Zeit kleiner dimensionierte, elektrisch angetriebene Schraubenspindelpumpen bekannt geworden, die höhere Drücke als Kreiselpumpen ermöglichen. Diese werden in einer T auchanordnung im Fahrzeugtank installiert und stellen in der Kraftstoffstrecke einen hohen Eingangsdruck vor der Hochdruckpumpe bzw. Einspritzpumpe bereit. Der elektrische Antrieb derartiger Kraftstoffforderpumpen 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 geforderten Kraftstoffs entspricht in der Regel einer Umgebungstemperatur des Fahrzeugs. Infolgedessen wird der Antrieb, der sich aus elektrischer Verlustleistung erwärmt, in derartigen Kraftstoffforderpumpen problemlos gekühlt. In the field of fuel delivery pumps for vehicles, electrically driven screw pumps with smaller dimensions have recently become known which allow higher pressures than centrifugal pumps. These are installed in a T also arrangement in the vehicle tank and provide a high inlet pressure in the fuel line upstream of the high pressure pump or injection pump. The electric drive of such fuel delivery 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 required 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 delivery pumps.
So beschreibt die US 2018/0216614 Al 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. For example, US 2018/0216614 Al describes a screw pump that is intended as a fuel pump. On a housing of the screw pump is a Cover attached 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. 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 it leaves the outlet on the pressure side.
Die WO 2014/138519 Al offenbart eine elektrische Flüssigkeitspumpe vom S ehr aub enspindeltyp . 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. WO 2014/138519 A1 discloses an electric fluid pump of the screw spindle type. The liquid flowing through an inlet and an outlet also surrounds the motor. A fuel is named as a liquid. A flange plane, which is shown in the construction shown between a housing part on the motor side and a housing part on the pump side, runs between the motor and an outlet on the pump side.
Die DE 10 2017 210 771 Al 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. 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 jacket. In the embodiment shown, which does not have a containment shell 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 above-mentioned pumps cannot be transferred to an application as an electric water pump, in particular not as an electric coolant pump. A liquid delivery medium such as a coolant would corrosively damage the exposed components of the electric motor, in particular the coil windings of the stator.
Die US 6,371,744 Bl beschreibt eine elektrische Vakuumpumpe vom Schraubenspindeltyp. Die S chraubenspindeln werden von einem Elektromotor angetrieben, der in einem separaten Gehäuse angeordnet ist. 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. No. 6,371,744 B1 describes an electrical vacuum pump of the screw spindle type. The screw spindles are driven by an electric motor which is arranged in a separate housing. Irrespective of specific modifications between a screw pump for gases and a screw pump for liquids, the said vacuum pump would not be transferable to an application as an electric coolant pump. With the arrangement shown, sufficient cooling of a dry-running electric motor could not be ensured. In a pressurized coolant circuit, a setpoint temperature of a coolant can be in the range of the boiling point 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, an object of the present invention is to create an electric screw pump that is suitable for pumping corrosive, liquid media and a cooling of the electrical drive provides.
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. Another aspect of the task is to provide a corresponding technical solution in such a way that it can also be implemented cost-effectively in series production of large numbers.
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 achieved by the features of claim 1. The electrical screw spindle coolant pump according to the invention for conveying a coolant circuit is particularly characterized in that a motor housing comprises a motor chamber in which a dry-running electric motor is arranged so as to be delimited from the conveying flow; and that the motor housing has a heat transfer section through which the delivery stream flows and 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 S chraubenspindelpumpe als Kühlmittelpumpe vor. Ferner sieht die Erfindung erstmals eine S chraubenspindelpumpe als eine elektrische Flüssigkeitspumpe vor, die von einem trockenlaufenden Elektromotor angetrieben wird. Thus, the invention provides for the first time a screw spindle pump as a coolant pump. Furthermore, the invention provides for the first time a screw spindle pump as an electric liquid pump that is driven by a dry-running electric motor.
Darüber hinaus sieht die Erfindung erstmals eine S chraubenspindelpumpe als eine elektrische Flüssigkeitspumpe vor, in der ein konvektionsunterstützter Wärmeübergang von einer trockenen Motorkammer auf einen Förder ström 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 is provided from a dry motor chamber to a conveying flow of the liquid conveying medium.
Durch die vorliegende Erfindung wird eine Kühlmittelpumpe mit einer hohen Leistungsdichte geschaffen. Die Schraubenspindelpumpe verschafft den hohen Förderdruck einer V erdrängerpumpe, 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 S chraubenspindel-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. The present invention creates a coolant pump with a high power density. The screw pump creates the high delivery pressure of a positive displacement pump, albeit with a relatively low pulsation, similar to a centrifugal pump. In connection 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, especially 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 Kontakt fläche 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 T emperaturdifferenz zwischen dem elektrischen Antrieb und dem Kühlmittel Abwärme aus elektrischer Verlustleistung effektiv aus der Pumpe abtransportiert werden. Die Vergrößerung der thermischen Kontaktfläche wird ohne eine höhere Komplexität des Aufbaus, wie in Form von oberflächenvergrößemden 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 F ertigungskosten 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. In structural terms, the invention is based on the principle of moving 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, a liquid-conducting area on the motor housing is created by the heat transfer section, which increases an internal thermal contact surface with the coolant. Via a heat exchange on the resulting thermal contact surface of the heat-conducting motor housing and a convection of the flow rate, 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. The enlargement of the thermal contact surface 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 boundary 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 in spite of an enlarged 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. Compared to a known pump structure with an exposed, wet-running electrical drive in the delivery flow, flow losses in the pump are significantly reduced.
Im Zuge der erläuterten Verlegung der Bauteilgrenze entsteht am Ende des Spindelgehäuses ein offener Querschnitt der Spindelkammer. Daher können die S chraubenspindeln bei der Montage der Pumpe einfach durch das offene Ende der Spindelkammer eingefuhrt 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 spindles can simply be inserted through the open end of the spindle chamber.
Vorteilhafte Weiterbildungen der Erfindung sind Gegenstand der abhängigen Ansprüche. Advantageous further 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 one aspect of the invention, the heat transfer section can further comprise the pump outlet. As a result, the flow cross-section of the entire delivery flow is guided past the motor chamber. The inner surface of the pump outlet on the heat transfer section increases the thermal contact surface of the thermally conductive motor housing with the flow rate again considerably.
Gemäß einem Aspekt der Erfindung kann der Wärmeübergangsabschnitt eine Förderstromkammer umfassen, die eine Verbindung zwischen der stimseitigen 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 Förder ström weiter verkürzt. Ferner vergrößert die Innenfläche der F örderstromkammer in dem Wärmeübergangsabschnitt weiterhin die thermische Kontaktfläche des wärmeleitfähigen Motorgehäuses mit dem Förderstrom. According to one aspect of the invention, the heat transfer section can comprise a delivery flow chamber which establishes a connection between the frontal delimitation of the motor chamber and the spindle chamber. Through this Design, the heat transfer path of the thermally conductive motor housing between the electrical heat sources in the motor chamber and the conveyor stream is further shortened. 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 one aspect of the invention, the heat transfer section can comprise a bearing seat for a shaft bearing, which is arranged between the electric motor and the screw spindles. 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 rate. In addition, the integration of a shaft bearing in the axial area of the heat transfer section favors a compact design 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 erfmdungsgemäße Kühlung des elektrischen Antriebs aufgenommen. Auf diese Weise wird auch die Verlustleistung aus einer Leistungselektronik über den Förder ström 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 conveyor stream.
Gemäß einem Aspekt der Erfindung können ein Stator und/oder eine Elektronik des Elektromotors in dem Motorgehäuse mit einer stimseitigen 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 an end delimitation of the motor chamber. This ensures that the heat transfer path of the thermally conductive motor housing is as short as possible between the electrical heat sources in the motor chamber and the delivery flow.
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. 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 N achbearbeitung 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 heat transfer section can be formed in one piece with the motor housing. This ensures an optimized heat transfer path without interfaces or joints in the material and the lowest possible manufacturing costs for the motor housing. According to one aspect of the invention, the spindle housing can be designed in one piece. As explained above, the relocation of the component boundary between the motor housing and the spindle housing creates an open cross section of the spindle chamber. As a result, no division into two halves of the housing is required either for the assembly of the pump or for the manufacture of the molded body of the spindle housing. The one-piece design of the spindle housing ensures a joint-free inner contour of the spindle chamber without the need for reworking. The inner contour of the spindle chamber can be produced easily 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 can comprise the pump inlet. The spindle housing is designed as a cast part during product development. Accordingly, 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 from 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 also allows different types of sealing.
Die Erfindung wird nachfolgend anhand einer Ausführungsform mit Bezug auf die begleitende Zeichnung beschrieben. The invention is described below on the basis of an embodiment with reference to the accompanying drawing.
Fig. 1 zeigt eine schematische Schnittansicht durch eine S chraubenspindel- Kühlmittelpumpe gemäß einer Ausfuhrungsform der Erfindung. Fig. 1 shows a schematic sectional view through a screw spindle 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 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 context of this disclosure, the term screw pump is understood to mean helical rotary piston pumps with a thread pitch for displacing the delivery medium. Such types of pumps generally include a driven screw spindle 2a and at least one further screw spindle 2b, which is dragged along by engagement of the toothing. In the embodiment of the schematic illustration from FIG. 1, a driven screw spindle 2a and a dragged screw spindle 2b are rotatably supported in a spindle chamber 10 of the spindle housing 1 in a spindle housing 1. The spindle chamber 10 has a cross-sectional contour in the form of a so-called figure eight 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 S chraubenprofilen der drehenden S chraubenspindeln 2a, 2b erzeugt auf der Saugseite der Spindelkammer 10 einen Unterdrück und auf der gegenüberliegenden Druckseite der Spindelkammer 10 einen Überdruck. Das Fördermedium wird durch eine kontinuierliche Verdrängung entlang einer S chraubensteigung der in Eingriff stehenden Schraubenprofile gefordert 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 connection. 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 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 rotary movement of engaging 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 delivery 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 stimseitigen 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 by a seal. 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 to the electric motor 4, are accommodated. An open one The end of the motor chamber 30 is closed off by a motor cover (not shown). In the motor housing 3, a collar-shaped bearing seat 32 with a passage opening is formed in an end-side delimitation of the motor chamber 30. 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 the entry of liquid.
Der trockenlaufende Elektromotor 4 ist ein Innenläufertyp mit einem innenliegenden Rotor 42 und einem außenliegenden Stator 4L 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 stimseitigen 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-running electric motor 4 is an internal rotor type having an internal rotor 42 and an external stator 4L. The rotor 42 is coupled to the driven screw spindle 2a. The stator 41 comprises 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 circumferential surface and with an end-side 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 W ärmeleitfähigkeit, wie einer Aluminiumgus slegierung, 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 F örderstromkammer 33 ausgebildet, die von dem flüssigen Fördermedium durchflossen wird. Die F örderstromkammer 33 stellt für den Förderstrom der Pumpe eine Verbindung zwischen der Druckseite der Spindelkammer 10 und dem Pumpenauslass 13 her. Die F örderstromkammer 33 umgibt den kragenförmigen Lagersitz 32 und führt das unter Druck stehende, flüssige Fördermedium an die stimseitige Begrenzung der Motorkammer 30 heran, mit welcher der Stator 41 in einem thermischen Kontakt steht. 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 F örderstromkammer 33 und die Oberfläche des Lagersitzes 32 tragen jeweils zu einer Vergrößerung der thermischen Kontaktfläche zwischen der Motorkammer 30 und dem Förder ström innerhalb desThe motor housing 3 consists of a metallic material with good thermal conductivity, such as a cast aluminum alloy, and is designed as a one-piece molded part. In an axial section between the motor chamber 30 and the flange section 35, a heat transfer section 31 of the motor housing 3 extends. 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. Within the heat transfer section 31, there is a delivery flow chamber 33 through which the liquid delivery medium flows. 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 conveying flow chamber 33 surrounds the collar-shaped bearing seat 32 and guides the pressurized, liquid conveying medium to the front boundary of the motor chamber 30, with which the stator 41 is in thermal contact. The heat transfer section 31 represents that region of the thermally conductive material volume on the motor housing 3 which is significantly involved in the dissipation of waste heat from the motor chamber 30 into the delivery flow. The inner surface of the pump outlet 13, the inner surface of the delivery 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 delivery flow within the
Wärmeübergangsabschnitts 31 bei. Heat transfer section 31 at.
Durch den optimierten Wärmeübergang wird eine T emperaturdifferenz 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. Due to the optimized heat transfer, a temperature difference between a coolant and the motor chamber 30 is limited. As a result, even under high loads with a high operating temperature of a coolant circuit, a critical component temperature of the electric drive, at which overheating damage to the winding insulation of the stator 41 or the electronics, is reliably prevented.
Bezugszeichenliste: List of reference symbols:
I Spindelgehäuse I spindle housing
2a angetriebene S chraubenspindel 2a driven screw spindle
2b mitgeschleppte S chraubenspindel 2b dragged screw spindle
3 Motorgehäuse 3 motor housing
4 Elektromotor 4 electric motor
10 Spindelkammer 10 spindle chamber
I I Pumpeneinlass I I pump inlet
13 Pumpenauslass 13 Pump outlet
15 Flanschabschnitt des Spindelgehäuses 15 flange portion of the spindle housing
23 Wellenlager 23 shaft bearings
30 Motorkammer 30 motor chamber
31 Wärmeübergangsabschnitt 31 heat transfer section
32 Lagersitz 32 bearing seat
33 F örderstromkammer 33 Flow chamber
34 Wellendichtung 34 Shaft seal
35 Flanschabschnitt des Motorgehäuses 35 flange section of the motor housing
41 Stator 41 stator
42 Rotor 42 rotor

Claims

Ansprüche Expectations
Elektrische Schraubenspindel-Kühlmittelpumpe zur Förderung eines Kühlmittelkreislaufs, aufweisend: ein Spindelgehäuse (1) mit einer Spindelkammer (10), in der wenigstens zwei Schraubenspindeln (2a, 2b) drehbar aufgenommen sind; einen Pumpeneinlass (11) und einen Pumpenauslass (13) zur Führung eines Förderstroms durch die Spindelkammer (10); ein Motorgehäuse (3), das axial benachbart zu dem Spindelgehäuse (1) angeordnet ist; dadurch gekennzeichnet, dass das Motorgehäuse (3) eine Motorkammer (30) umfasst, in der ein trockenlaufender Elektromotor (4) zu dem Förderstrom abgegrenzt angeordnet ist; und das Motorgehäuse (3) einen von dem Förderstrom durchflossenen W ärmeübergangs abschnitt (31) aufweist, der zwischen der Motorkammer (30) und einer Bauteilgrenze des Motorgehäuses (3) zu dem Spindelgehäuse (1) angeordnet ist. Electric screw spindle coolant pump for conveying a coolant circuit, comprising: a spindle housing (1) with a spindle chamber (10) in which at least two screw spindles (2a, 2b) are rotatably received; a pump inlet (11) and a pump outlet (13) for guiding a delivery flow through the spindle chamber (10); a motor housing (3) which is arranged axially adjacent to the spindle housing (1); characterized in that the motor housing (3) comprises a motor chamber (30) in which a dry-running electric motor (4) is arranged so as to be delimited from the delivery flow; and the motor housing (3) has a heat transfer section (31) through which the delivery stream flows and which is arranged between the motor chamber (30) and a component boundary of the motor housing (3) to the spindle housing (1).
Elektrische S chraubenspindel-Kühlmittelpumpe nach Anspruch 1, wobei der Wärmeübergangsabschnitt (31) ferner den Pumpenauslass (13) umfasst. The screw-screw electric coolant pump of claim 1, wherein the heat transfer portion (31) further comprises the pump outlet (13).
3. Elektrische Schraubenspindel-Kühlmittelpumpe nach Anspruch 1 oder 2, wobei der Wärmeübergangsabschnitt (31) eine Förderstromkammer (33) umfasst, die eine Verbindung zwischen einer stimseitigen Abgrenzung der Motorkammer (30) und der Spindelkammer (10) herstellt. 3. Electric screw spindle coolant pump according to claim 1 or 2, wherein the heat transfer section (31) comprises a delivery flow chamber (33) which establishes a connection between an end delimitation of the motor chamber (30) and the spindle chamber (10).
Elektrische Schraubenspindel-Kühlmittelpumpe nach einem der vorhergehenden Ansprüche, wobei der Wärmeübergangsabschnitt (31) einen Lagersitz (32) für ein Wellenlager (23) umfasst, das zwischen dem Elektromotor (4) und den Schraubenspindeln (2a, 2b) angeordnet ist. Electric screw spindle coolant pump according to one of the preceding claims, wherein the heat transfer section (31) comprises a bearing seat (32) for a shaft bearing (23) which is arranged between the electric motor (4) and the screw spindles (2a, 2b).
Elektrische S chraubenspindel-Kühlmittelpumpe nach einem der vorhergehenden Ansprüche, wobei auch eine Elektronik für den Elektromotor (4) in der Motorkammer (30) angeordnet ist. Electric screw spindle coolant pump according to one of the preceding claims, electronics for the electric motor (4) also being arranged in the motor chamber (30).
Elektrische Schraubenspindel-Kühlmittelpumpe nach einem der vorhergehenden Ansprüche, wobei ein Stator (41) und/oder eine Elektronik des Elektromotors (4) in dem Motorgehäuse (3) mit einer stimseitigen Abgrenzung der Motorkammer (30) in Kontakt stehen. Electric screw spindle coolant pump according to one of the preceding claims, wherein a stator (41) and / or electronics of the electric motor (4) in the motor housing (3) are in contact with an end delimitation of the motor chamber (30).
Elektrische Schraubenspindel-Kühlmittelpumpe nach einem der vorhergehenden Ansprüche, wobei der Wärmeübergangsabschnitt (31) einteilig mit dem Motorgehäuse (3) ausgebildet ist. An electric screw spindle coolant pump according to any one of the preceding claims, wherein the heat transfer section (31) is formed in one piece with the motor housing (3).
8. Elektrische Schraubenspindel-Kühlmittelpumpe nach einem der vorhergehenden8. Electric screw spindle coolant pump according to one of the preceding
Ansprüche, wobei das Spindelgehäuse (1) einteilig ausgebildet ist. Claims, wherein the spindle housing (1) is formed in one piece.
9, Elektrische Schraubenspindel-Kühlmittelpumpe nach einem der vorhergehenden Ansprüche, wobei an der Bauteilgrenze zwischen dem Motorgehäuse (3) und dem Spindelgehäuse (1) eine Flanschverbindung aus einem Flanschabschnitt (35) des Motorgehäuses (3) und einem Flanschabschnitt (15) des Spindelgehäuses (1) ausgebildet ist. 9, Electric screw spindle 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 connection consisting of a flange section (35) of the motor housing (3) and a flange section (15) of the spindle housing ( 1) is formed.
EP19817281.9A 2019-02-12 2019-12-09 Electrical screw spindle coolant pump Active EP3924624B1 (en)

Applications Claiming Priority (2)

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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 true EP3924624A1 (en) 2021-12-22
EP3924624B1 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)
WO (1) WO2020164776A1 (en)

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EP3924624B1 (en) 2023-04-19
WO2020164776A1 (en) 2020-08-20
CN113227580B (en) 2023-06-27
CN113227580A (en) 2021-08-06
DE102019103470A1 (en) 2020-08-13
US20220099088A1 (en) 2022-03-31
BR112021012370A2 (en) 2021-08-31

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