US20140037432A1 - Controllable coolant pump - Google Patents

Controllable coolant pump Download PDF

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Publication number
US20140037432A1
US20140037432A1 US14/004,811 US201214004811A US2014037432A1 US 20140037432 A1 US20140037432 A1 US 20140037432A1 US 201214004811 A US201214004811 A US 201214004811A US 2014037432 A1 US2014037432 A1 US 2014037432A1
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US
United States
Prior art keywords
guide plate
impeller
coolant pump
closing
recited
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.)
Abandoned
Application number
US14/004,811
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English (en)
Inventor
Marks Popp
Sebastian Hurst
Michael Weiss
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.)
Schaeffler Technologies AG and Co KG
Original Assignee
Schaeffler Technologies AG and Co KG
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 Schaeffler Technologies AG and Co KG filed Critical Schaeffler Technologies AG and Co KG
Assigned to Schaeffler Technologies AG & Co. KG reassignment Schaeffler Technologies AG & Co. KG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WEISS, MICHAEL, HURST, SEBASTIAN, Popp, Markus
Publication of US20140037432A1 publication Critical patent/US20140037432A1/en
Assigned to SCHAEFFLER TECHNOLOGIES GMBH & CO. KG reassignment SCHAEFFLER TECHNOLOGIES GMBH & CO. KG MERGER AND CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: Schaeffler Technologies AG & Co. KG, SCHAEFFLER VERWALTUNGS 5 GMBH
Assigned to Schaeffler Technologies AG & Co. KG reassignment Schaeffler Technologies AG & Co. KG CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: SCHAEFFLER TECHNOLOGIES GMBH & CO. KG
Assigned to Schaeffler Technologies AG & Co. KG reassignment Schaeffler Technologies AG & Co. KG CORRECTIVE ASSIGNMENT TO CORRECT THE PROPERTY NUMBERS PREVIOUSLY RECORDED ON REEL 037732 FRAME 0347. ASSIGNOR(S) HEREBY CONFIRMS THE APP. NO. 14/553248 SHOULD BE APP. NO. 14/553258. Assignors: SCHAEFFLER TECHNOLOGIES GMBH & CO. KG
Abandoned 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
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0027—Varying behaviour or the very pump
    • F04D15/0038—Varying behaviour or the very pump by varying the effective cross-sectional area of flow through the rotor

Definitions

  • the present invention relates to a coolant pump for a coolant circuit of an internal combustion engine.
  • the coolant pump has a pump housing in which is mounted a drivable shaft, to one end of which is attached an impeller which has vanes extending into a suction chamber and is connected to a cover plate.
  • an impeller which has vanes extending into a suction chamber and is connected to a cover plate.
  • a guide plate which is axially displaceable by an actuation unit, is disposed between the impeller and the cover plate.
  • the guide plate has a contour corresponding to the impeller and a collar oriented toward the impeller.
  • the coolant pump should be switchable or ideally controllable. This is accomplished selectively by adjusting the flow rate.
  • the guide plate is axially displaced in the pump within the impeller. This must be accomplished by an actuator that is preferably axially mounted in as neutral a manner as possible in terms of space requirements.
  • a coolant pump of the aforementioned type is known from German Patent Application DE 2008 046 424 A1.
  • the guide plate has at least one opening.
  • the opening provided reduces the effective pressure difference between the front and rear sides of the guide plate, which in turn reduces the axial force required to displace the guide plate. Fluid communication between the front and rear sides of the guide plate is facilitated.
  • the fluid conveyed radially behind the guide plate has a centrifugal pressure typical of impellers.
  • a mean pressure is generated behind the guide plate.
  • the pressurized fluid has a force component directed in the guide-plate-closing direction.
  • the guide-plate-closing direction refers to the axial displacement of the guide plate toward the cover plate.
  • the guide-plate-opening direction refers to the axial displacement of the guide plate toward the impeller. In this manner, the actuator is relieved of load during the displacement operation in terms of the force to be exerted.
  • the openings can have different shapes, such as, for example, flow-optimized shapes in order to make use of flow effects, or radial openings extending in the guide plate, or shapes which are optimized for economical manufacture. Regardless of the specific embodiment, the greatest effect is achieved when the openings are located in the region near the axis of rotation of the guide plate.
  • the graph of FIG. 4 illustrates the change in the fluid forces as a function of the degree of opening of the guide plate.
  • the fluid force is zero, which would allow the actuator to axially displace the guide plate without requiring additional force.
  • a fluid force of zero cannot be achieved with a guide plate without openings. The greater the number of openings, the faster the decrease in the force level.
  • the graph also shows that the force level becomes negative above a certain degree of opening of the guide plate and a certain number of openings.
  • a negative force level i.e., negative fluid forces, means that the guide plate moves toward the cover plate, thus preventing the passage of fluid within the water pump, which is to be avoided.
  • the actuator In order to enable the actuator to exert sufficient force against the negative fluid forces, it would have to be designed stronger and larger, which in turn would result in additional costs.
  • the actuation unit may optionally include a spring.
  • This spring applies pressure to the guide plate indirectly via the shaft in the guide-plate-opening direction.
  • This embodiment provides a fail-safe solution. If the actuator fails and the guide plate is pulled by a negative fluid force in the guide-plate-closing direction, thereby reducing the coolant flow, the spring produces a counterpressure to prevent the guide plate from closing. However, in this embodiment, all of the force curves would have to be increased by the preload of the spring. This would partially cancel out the previously achieved force reduction.
  • the closing contour is configured in the manner of a pin, the closing contour having more than one pin-like closing element, and the individual closing elements differing in their dimensions (length and/or diameter).
  • the axially stepped closing contour may be disposed in the injection-molded portion of the impeller or in the insert thereof.
  • the pins have different lengths, so that when the guide plate is displaced toward the closing contour, first a longer pin-like closing element closes one opening, and when the guide plate is advanced further toward the closing contour, a shorter pin-like closing element closes another opening. It would also be possible to conceive of closing elements having different diameters and corresponding openings in the guide plate.
  • Another option in accordance with the present invention is to configure at least one closing element in a stepped manner, which allows for partial closure of the opening.
  • the actuation unit includes an actuator adapted to actuate independently of the rotational speed of the impeller.
  • FIGS. 1 through 4 Exemplary embodiments of the present invention are shown in FIGS. 1 through 4 , which are described in detail below, without limiting the invention to such embodiments.
  • FIG. 1 is a cross-sectional view of a controllable coolant pump having a guide plate provided with openings, shown with the guide plate closed;
  • FIG. 2 a is a schematic view of the guide plate, where its openings are closed by closing elements
  • FIG. 2 b is a schematic view of the guide plate, where only one opening is closed by a closing element
  • FIG. 2 c is a schematic view of the guide plate, shown with the openings open;
  • FIG. 3 is a detail view of the guide plate, shown with a stepped closing element
  • FIG. 4 is a graph showing different fluid force curves as a function of the number of openings and the degree of opening of the guide plate.
  • FIG. 1 shows a coolant pump for a coolant circuit of an internal combustion engine, the coolant pump having a pump housing 1 , in which is mounted a drivable shaft 2 a having an impeller 4 attached to one end thereof.
  • Impeller 4 has vanes 6 extending into suction chamber 7 .
  • Impeller 4 and cover plate 9 are joined to one another. When impeller 4 rotates, fluid is conveyed into suction chamber 7 through an intake port 10 of pump housing 1 .
  • a guide plate 12 which is axially displaceable by an actuation unit 3 , is disposed between impeller 4 and cover plate 9 .
  • Guide plate 12 has a contour corresponding to impeller 4 and a collar 13 oriented toward impeller 4 .
  • the coolant pump In order to achieve rapid heating of the internal combustion engine and to selectively adjust the engine temperature, the coolant pump must be controllable or switchable. To this end, a volume flow rate is adjusted in accordance with demand.
  • guide plate 12 In order to adjust the volume flow rate, guide plate 12 is axially displaced in pump housing 1 . As guide plate 12 is displaced between impeller 4 and cover plate 9 , it changes the degree of opening, thereby controlling the passage of the flow.
  • Actuation unit 3 includes both the shaft 2 a and a push rod 2 b axially displaceable in shaft 2 a, as well as an actuator 14 actuating push rod 2 b. Push rod 2 b is directly connected to guide plate 12 . The displacement of guide plate 12 is controlled by actuator 14 .
  • Actuator 14 should be incorporated into the coolant pump in as neutral a manner as possible in terms of space requirements. For this reason, the forces resulting from the volume flow and acting on guide plate 12 should be kept as low as possible to be able to choose an actuator 14 that is convenient in terms of space.
  • openings 11 are formed in guide plate 12 .
  • the openings 11 formed reduce the effective pressure difference between the front side of the guide plate (the face facing the cover plate) and the rear side of the guide plate (the face facing the impeller). This, in turn, leads to a reduction in the fluid forces exerted by the fluid flow on guide plate 12 .
  • the degree of opening of guide plate 12 is an indication of the amount of flow through the coolant pump.
  • the graph of FIG. 4 illustrates the relationship between the number of openings 11 formed in guide plate 12 , the degree of opening of guide plate 12 , and the fluid forces acting on guide plate 12 .
  • a refinement of the present invention proposes that the openings 11 of guide plate 12 be variably activated and deactivated according to the degree of opening. This is achieved by a closing contour 5 formed in the impeller 4 provided with vanes 6 . This contour may be formed in the steel insert of impeller 4 or in the injection-molded portion thereof, as illustrated in FIGS. 2 through 3 . As guide plate 12 is displaced toward impeller 4 , pin-like closing elements 5 a engage into one or more openings 11 and close the same. In the graph of FIG. 4 , an idealized force curve 20 is shown. Idealized force curve 20 shows a nearly constant force acting on guide plate 12 , regardless of its degree of opening.
  • This idealized force curve 20 can only be achieved if each time one of the marked operating points S x is reached, a jumps is made to one of the nearest operating points. This is achieved by changing the number of openings 11 of guide plate 12 and the degree of opening of guide plate 12 . This is implemented using an axially stepped closing contour 5 having pin-like closing elements 5 a. Closing elements 5 a engage into openings 11 of guide plate 12 as it is displaced between impeller 4 and cover plate 9 . The displacement of guide plate 12 causes a change in the degree of opening. Moreover, because of closing contour 5 , different numbers of openings 11 are cleared or closed. FIG. 2 a shows guide plate 12 in an open position with the openings closed.
  • FIG. 3 shows a stepped, pin-like closing element 5 a, which permits implementation of half-closed openings 11 .
  • FIG. 2 b shows guide plate 12 in a position after having been displaced in the closing direction, and in which one opening 11 is closed. This corresponds to the operating range between operating points S 2 and S 3 in the graph.
  • FIG. 2 c shows guide plate 12 in the closed position in which two openings are open. This corresponds in the graph to the operating range from operating point S 3 to operating point S 4 or an opening degree of 0%, respectively, depending on the degree of opening.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US14/004,811 2011-06-07 2012-01-31 Controllable coolant pump Abandoned US20140037432A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102011077030.5 2011-06-07
DE102011077030A DE102011077030A1 (de) 2011-06-07 2011-06-07 Regelbare Kühlmittelpumpe
PCT/EP2012/051543 WO2012167953A1 (fr) 2011-06-07 2012-01-31 Pompe à liquide de refroidissement réglable

Publications (1)

Publication Number Publication Date
US20140037432A1 true US20140037432A1 (en) 2014-02-06

Family

ID=45566991

Family Applications (1)

Application Number Title Priority Date Filing Date
US14/004,811 Abandoned US20140037432A1 (en) 2011-06-07 2012-01-31 Controllable coolant pump

Country Status (4)

Country Link
US (1) US20140037432A1 (fr)
CN (1) CN103688061A (fr)
DE (1) DE102011077030A1 (fr)
WO (1) WO2012167953A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140003913A1 (en) * 2011-06-07 2014-01-02 Sebastian Hurst Infinitely adjustable coolant pump
US20140299439A1 (en) * 2011-12-15 2014-10-09 Schaeffler Technologies Gmbh & Co. Kg Actuator device for actuating a coupling mechanism

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014201877A1 (de) 2014-02-03 2015-08-20 Schaeffler Technologies AG & Co. KG Filterelement für Leitblechöffnungen einer schaltbaren Kühlmittelpumpe

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5169286A (en) * 1989-03-09 1992-12-08 Yutaka Yamada Variable capacity centrifugal water pump with movable pressure chamber formed by impeller
WO2010028921A1 (fr) * 2008-09-09 2010-03-18 Schaeffler Kg Pompe à réfrigérant réglable
US20140003913A1 (en) * 2011-06-07 2014-01-02 Sebastian Hurst Infinitely adjustable coolant pump

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1502781A (en) * 1975-10-06 1978-03-01 Secretary Industry Brit Centrifugal fans and pumps
US6074167A (en) * 1999-02-05 2000-06-13 Woodward Governor Company Variable geometry centrifugal pump
DE102008022354B4 (de) * 2008-05-10 2012-01-19 Geräte- und Pumpenbau GmbH Dr. Eugen Schmidt Regelbare Kühlmittelpumpe und Verfahren zu deren Regelung
DE102010022885A1 (de) * 2010-06-07 2011-12-08 Schaeffler Technologies Gmbh & Co. Kg Regelbare Kühlmittelpumpe
DE102010022884A1 (de) * 2010-06-07 2011-12-08 Schaeffler Technologies Gmbh & Co. Kg Abdichtung für eine regelbare Kühlmittelpumpe
DE102011101275B3 (de) * 2011-05-12 2012-01-12 Geräte- und Pumpenbau GmbH Dr. Eugen Schmidt "Regelbare Kühlmittelpumpe"

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5169286A (en) * 1989-03-09 1992-12-08 Yutaka Yamada Variable capacity centrifugal water pump with movable pressure chamber formed by impeller
WO2010028921A1 (fr) * 2008-09-09 2010-03-18 Schaeffler Kg Pompe à réfrigérant réglable
US20110162597A1 (en) * 2008-09-09 2011-07-07 Schaeffler Technologies Gmbh & Co. Kg Variable coolant pump
US20140003913A1 (en) * 2011-06-07 2014-01-02 Sebastian Hurst Infinitely adjustable coolant pump

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140003913A1 (en) * 2011-06-07 2014-01-02 Sebastian Hurst Infinitely adjustable coolant pump
US20140299439A1 (en) * 2011-12-15 2014-10-09 Schaeffler Technologies Gmbh & Co. Kg Actuator device for actuating a coupling mechanism

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Publication number Publication date
WO2012167953A1 (fr) 2012-12-13
DE102011077030A1 (de) 2012-12-13
CN103688061A (zh) 2014-03-26

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AS Assignment

Owner name: SCHAEFFLER TECHNOLOGIES AG & CO. KG, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:POPP, MARKUS;HURST, SEBASTIAN;WEISS, MICHAEL;SIGNING DATES FROM 20130808 TO 20130821;REEL/FRAME:031261/0129

AS Assignment

Owner name: SCHAEFFLER TECHNOLOGIES AG & CO. KG, GERMANY

Free format text: CHANGE OF NAME;ASSIGNOR:SCHAEFFLER TECHNOLOGIES GMBH & CO. KG;REEL/FRAME:037732/0347

Effective date: 20150101

Owner name: SCHAEFFLER TECHNOLOGIES GMBH & CO. KG, GERMANY

Free format text: MERGER AND CHANGE OF NAME;ASSIGNORS:SCHAEFFLER TECHNOLOGIES AG & CO. KG;SCHAEFFLER VERWALTUNGS 5 GMBH;REEL/FRAME:037732/0228

Effective date: 20131231

AS Assignment

Owner name: SCHAEFFLER TECHNOLOGIES AG & CO. KG, GERMANY

Free format text: CORRECTIVE ASSIGNMENT TO CORRECT THE PROPERTY NUMBERS PREVIOUSLY RECORDED ON REEL 037732 FRAME 0347. ASSIGNOR(S) HEREBY CONFIRMS THE APP. NO. 14/553248 SHOULD BE APP. NO. 14/553258;ASSIGNOR:SCHAEFFLER TECHNOLOGIES GMBH & CO. KG;REEL/FRAME:040404/0530

Effective date: 20150101

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION