EP3816419A1 - Schraubenpumpe und ein fahrzeugskühlkreislauf mit dieser pumpe. - Google Patents

Schraubenpumpe und ein fahrzeugskühlkreislauf mit dieser pumpe. Download PDF

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Publication number
EP3816419A1
EP3816419A1 EP19206688.4A EP19206688A EP3816419A1 EP 3816419 A1 EP3816419 A1 EP 3816419A1 EP 19206688 A EP19206688 A EP 19206688A EP 3816419 A1 EP3816419 A1 EP 3816419A1
Authority
EP
European Patent Office
Prior art keywords
axis
rotor
screw
pump
screw pump
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP19206688.4A
Other languages
English (en)
French (fr)
Inventor
Didier Richard
Lionel Martin
Dominique Vaginet
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.)
Illinois Tool Works Inc
Original Assignee
Illinois Tool Works Inc
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 Illinois Tool Works Inc filed Critical Illinois Tool Works Inc
Priority to EP19206688.4A priority Critical patent/EP3816419A1/de
Publication of EP3816419A1 publication Critical patent/EP3816419A1/de
Pending legal-status Critical Current

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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
    • F04C2/165—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 having more than two rotary pistons with parallel axes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P5/00—Pumping cooling-air or liquid coolants
    • F01P5/10—Pumping liquid coolant; Arrangements of coolant pumps
    • F01P5/12—Pump-driving arrangements
    • 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
    • F04C11/00—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
    • F04C11/008—Enclosed motor pump units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P5/00—Pumping cooling-air or liquid coolants
    • F01P5/10—Pumping liquid coolant; Arrangements of coolant pumps
    • F01P5/12—Pump-driving arrangements
    • F01P2005/125—Driving auxiliary pumps electrically
    • 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
    • F04C15/06—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet

Definitions

  • the invention relates to the field of screw pumps and cooling circuits for vehicles, in particular automobiles.
  • a cooling circuit for a motor vehicle such as that shown in figure 1 , comprises a pump 12 ensuring the circulation of a cooling liquid, such as water, in the cooling circuit.
  • a cooling liquid such as water
  • a cooling circuit may further include a coolant reservoir 10, a heat exchanger 14 and at least one element 16 to be cooled, such as an engine of the vehicle.
  • Element 16 is equipped with a temperature sensor 20, the signals of which are transmitted to a unit 18 for controlling a proportional valve 22 making it possible to regulate the flow of coolant leaving the pump 12 and supplying the heat exchanger. heat 14.
  • the pump 12 is a centrifugal pump, that is to say it is a pump whose rotor is formed by a paddle wheel configured to suck liquid through the center and to push it back by its periphery.
  • the coolant flow rate at the outlet of the pump depends on the speed of rotation of the impeller but is not always constant and it is therefore necessary to associate the aforementioned proportional valve 22 with this type of pump.
  • the circuit would include other (auxiliary) pumps, these pumps would also be centrifugal pumps.
  • the present invention provides an improvement to this technology.
  • the invention thus proposes an optimized screw pump and in particular an optimized size.
  • the mounting of the screws inside the rotor of the motor is particularly advantageous for limiting the axial bulk of the pump (compared to a pump in which the screws would extend in the axial extension of the rotor of the motor).
  • the screw pump can be used in any application and is particularly advantageous for its use in a motor vehicle, for example to ensure the circulation of a cooling liquid in a cooling circuit.
  • a screw pump makes it possible to provide an output flow rate proportional to the speed of rotation of the motor and which is canceled as soon as the pump is stopped.
  • this screw pump in a cooling circuit, it is therefore understood that it would be conceivable to eliminate the proportional valve necessary when using a centrifugal pump.
  • another advantage is linked to the small size of a screw pump compared to a centrifugal pump.
  • the power of a screw pump can for example be optimized by adapting the length, diameter and / or number of screws, while the power of a centrifugal pump can be optimized only by the diameter or thickness of its spinning wheel.
  • screws in the pump which are not made of metal but which are rather made of plastic or composite material, in order to reduce the weight of the pump and facilitate the production of these screws, for example by injection molding.
  • the number of screws is not limiting and is determined as a function of the needs in terms of flow rate at the pump outlet in particular.
  • the present invention also relates to a cooling circuit for a vehicle, in particular a motor vehicle, this circuit comprising a screw pump as described above.
  • the circuit may further include one or more of the components chosen from: a coolant reservoir, a heat exchanger, at least one element to be cooled and a temperature sensor of this equipment, the circuit being devoid of a proportional valve and said pump being configured to be controlled by a control unit as a function of signals emitted by said temperature sensor.
  • the present invention also relates to a vehicle, in particular a motor vehicle, comprising at least one pump or a circuit as described above.
  • the figure 2 illustrates a cooling circuit 24 within the meaning of the invention.
  • This circuit 24 comprises at least one screw pump 26 which is associated with a coolant reservoir 10 in the example shown.
  • the screw pump 26 and the reservoir 10 can be two separate elements connected by at least one pipe, or they can be mounted one on top of the other as in the example of figure 3 where the pump 26 is attached directly to the reservoir 10.
  • the pump 26 comprises an inlet 26a connected to the reservoir 10 or opening into this reservoir, and an outlet 26b.
  • the screw pump 26 is connected to a heat exchanger 14 and to an element 16 to be cooled.
  • the outlet 26b of the pump 26 is connected to an inlet 14a of the exchanger 14, an outlet 14b of which is connected to an inlet 16a of the element 16.
  • This element 16 comprises an outlet 16b connected to the inlet 26a of the pump. 26 or tank 10.
  • the element 16 is equipped with a temperature sensor 20, the signals of which are transmitted to a control unit 18 of the screw pump 26 in order to regulate the flow of coolant leaving the pump 12 and supplying the heat exchanger. heat 14.
  • a screw pump 26 comprises screws, at least one of which is driven, directly or indirectly, by a motor, the rotary screw (s) being configured to force the circulation of coolant in the circuit 24.
  • a screw whether fixed or rotating, has an elongated shape and a helical thread that extends substantially over its entire length.
  • the screws extend next to each other and parallel to each other.
  • the threads of the screws are complementary and mesh with each other, the threads of the rotating screws being configured to force the flow of liquid along the screw.
  • the direction of circulation of the liquid depends on the direction of rotation of the screw, which depends on the direction of the motor supply current.
  • the screws 28, 30 are advantageously made of plastic or composite material. They are for example produced by injection molding, which makes it possible to have screws of complex shape at a relatively limited cost.
  • the figures 4 to 8 illustrate an embodiment of a screw pump 26 according to the invention.
  • the pump 26 comprises a fixed central screw 28 and three rotating side screws 30 in the example shown, although these respective numbers are not limiting.
  • the pump 26 further comprises an electric motor 32 which is here of the BLDC type (acronym for Brushless Direct Current ).
  • the motor 32 comprises fixed electric coils 32a and a rotor 33 made of ferromagnetic material or carrying elements 33a in this material.
  • the rotor 33 extends along and around an axis A, which is the main axis of the screw pump 26. As seen in the drawings, the inlet 26a and outlet 26b of the pump 26 are coaxial and centered on this axis A.
  • the rotor 33 comprises a body 33b as well as two discs 33c fixed respectively to the axial ends of the body 33b.
  • the body 33b comprises a central housing 34 of cylindrical shape and of axis A.
  • the body 33b further comprises cylindrical lateral housings 36 extending parallel to the axis A.
  • figure 8 shows that the housings 36 are regularly distributed around the central housing 34 and the axis A, and open into the central housing 34.
  • housings 34, 36 are closed at their axial ends by the discs 33c, which are attached and fixed to the body 33b, for example by screws or the like.
  • the body 33b comprises at its outer periphery recesses for receiving the ferromagnetic elements 33a.
  • These elements 33a are for example three or more in number and are regularly distributed around the axis A.
  • the coils 32a are arranged around the rotor 33 and the axis A. They are for example three or more in number and are regularly distributed around the axis A.
  • the coils 32a can extend along the axis A over a distance L1 representing at least 80% of the length L2 of the rotor 33.
  • the screws 28, 30 are housed in the rotor 33 and pass axially through this rotor 33.
  • the screw 28 is fixed and extends on and along the axis A, inside the aforementioned central housing 34.
  • the other screws 30 are rotary and extend parallel to the axis A, inside the side housings 36.
  • Each of the rotary screws 30 has an axis of extension B which is parallel to the axis A and which is a axis of rotation of this rotary screw 30.
  • the lateral housings 36 have diameters slightly greater than those of the rotary screws 30 and are configured to guide these screws 30 in rotation about the axes B.
  • central housing 34 has an external diameter slightly greater than that of the fixed screw 28, this screw 28 is prevented from rotating in rotation about the axis A.
  • This rotational locking is here provided by flanges 38, 40 reported. at the axial ends of the rotor 33 and defining the inlet 26a and the outlet 26b of the pump 26.
  • a first flange 38 located on the left on the figure 7 , defines the inlet 26a (due to the direction of the arrow F1 of circulation of the liquid in the pump 26) and comprises a tubular sleeve 38a centered on the axis A and forming this inlet, and an annular flange 38b for tight fixing to the other flange 40.
  • the second flange 40 located to the right on the figure 7 , defines the outlet (see arrow F1) and comprises a tubular sleeve 40a centered on the axis A and forming this outlet, and an annular bell 40b for tight fixing to the other flange 38.
  • the bell 40b extends around the rotor 33 with a certain radial play so as to allow the rotation of the rotor 33 around the axis A inside this bell.
  • the bell 40 comprises at an axial end opposite the sleeve 40a a flange 40c applied and fixed axially against the flange 38b of the first flange 38.
  • Annular sealing gaskets 42 for example made of elastomer, can be mounted in the junction plane of the flanges 38b, 40c, as in the example shown.
  • the pump 26 further comprises a shroud 44 which extends around the flanges 38, 40 and the rotor 33.
  • the bell 40b of the second flange 40 extends inside a cylindrical portion 44a of the shroud 44 and defines therewith an annular space E for housing the coils 32a.
  • the flanges 38b, 40c of the flanges 38, 40 have their outer peripheries which bear on an internal cylindrical surface 44aa of this cylindrical portion 44a in order to center the flanges 38, 40 in the fairing 44, at a end of this fairing.
  • the cylindrical portion 44a is connected to an annular flange 44b which extends radially inwards with respect to the axis A and bears on a cylindrical flange 40d of the second flange 40 or of his bell 40b.
  • the flanges 38, 40 comprise elements for immobilizing the fixed screw 28 in rotation about the axis A.
  • each of the flanges 38, 40 comprises an orifice 38c, 40e configured to receive and cooperate by complementarity. of shapes with a corresponding end 28a of the fixed screw 28, in order to immobilize the latter in rotation around the axis A.
  • Each end 28 may for example be crenellated or serrated and include teeth engaged in notches in the orifices 38c, 40e.
  • the ends 28a of the screw 28 pass through orifices 33ca of the discs 33c, located at the level of the axis A.
  • the discs 33c further include holes 33cb, at the level of the axial ends of the rotary screws 30, which allow the passage of liquid. from entry to exit (arrows F2).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Rotary Pumps (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP19206688.4A 2019-10-31 2019-10-31 Schraubenpumpe und ein fahrzeugskühlkreislauf mit dieser pumpe. Pending EP3816419A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19206688.4A EP3816419A1 (de) 2019-10-31 2019-10-31 Schraubenpumpe und ein fahrzeugskühlkreislauf mit dieser pumpe.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19206688.4A EP3816419A1 (de) 2019-10-31 2019-10-31 Schraubenpumpe und ein fahrzeugskühlkreislauf mit dieser pumpe.

Publications (1)

Publication Number Publication Date
EP3816419A1 true EP3816419A1 (de) 2021-05-05

Family

ID=68426180

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19206688.4A Pending EP3816419A1 (de) 2019-10-31 2019-10-31 Schraubenpumpe und ein fahrzeugskühlkreislauf mit dieser pumpe.

Country Status (1)

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EP (1) EP3816419A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023240238A1 (en) * 2022-06-10 2023-12-14 Illinois Tool Works Inc. Screw pump and its components
WO2023240239A1 (en) * 2022-06-10 2023-12-14 Illinois Tool Works Inc. Screw pump and its components

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3701586A1 (de) * 1987-01-21 1988-08-04 Leistritz Ag Dichtungsfreie pumpe
EP0323834A2 (de) * 1988-01-08 1989-07-12 Leistritz Aktiengesellschaft Dichtungsfreie Pumpe
EP2336590A2 (de) * 2009-12-15 2011-06-22 Leistritz Pumpen GmbH Pumpenaggregat für ein Doppelkupplungsgetriebe eines Kraftfahrzeugs

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3701586A1 (de) * 1987-01-21 1988-08-04 Leistritz Ag Dichtungsfreie pumpe
EP0323834A2 (de) * 1988-01-08 1989-07-12 Leistritz Aktiengesellschaft Dichtungsfreie Pumpe
EP2336590A2 (de) * 2009-12-15 2011-06-22 Leistritz Pumpen GmbH Pumpenaggregat für ein Doppelkupplungsgetriebe eines Kraftfahrzeugs

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023240238A1 (en) * 2022-06-10 2023-12-14 Illinois Tool Works Inc. Screw pump and its components
WO2023240239A1 (en) * 2022-06-10 2023-12-14 Illinois Tool Works Inc. Screw pump and its components
FR3136524A1 (fr) * 2022-06-10 2023-12-15 Illinois Tool Works Pompe à vis et ses composants
FR3136521A1 (fr) * 2022-06-10 2023-12-15 Illinois Tool Works Pompe à vis et ses composants

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