EP2295809A2 - Dispositif de pompe à fluide doté d'un dispositif d'étanchéité - Google Patents

Dispositif de pompe à fluide doté d'un dispositif d'étanchéité Download PDF

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Publication number
EP2295809A2
EP2295809A2 EP10168287A EP10168287A EP2295809A2 EP 2295809 A2 EP2295809 A2 EP 2295809A2 EP 10168287 A EP10168287 A EP 10168287A EP 10168287 A EP10168287 A EP 10168287A EP 2295809 A2 EP2295809 A2 EP 2295809A2
Authority
EP
European Patent Office
Prior art keywords
impeller
housing
pump device
fluid pump
sealing
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.)
Withdrawn
Application number
EP10168287A
Other languages
German (de)
English (en)
Inventor
Bernd Hein
Jerome Thiery
Christoph Heier
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2295809A2 publication Critical patent/EP2295809A2/fr
Withdrawn legal-status Critical Current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
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/0606—Canned motor pumps
    • F04D13/0613—Special connection between the rotor compartments
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/0606—Canned motor pumps
    • F04D13/0633—Details of the bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/042—Axially shiftable rotors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/08—Sealings
    • F04D29/086—Sealings especially adapted for liquid pumps

Definitions

  • the invention relates to a fluid pump device with a sealing device for a motor vehicle, in particular a water pump device or auxiliary water pump device.
  • a residual heat pump for an internal combustion engine has a centrifugal pump and a DC motor.
  • the centrifugal pump is arranged in a pump housing and connected via a shaft with a rotor.
  • the rotor is arranged in a containment shell, which is connected to the pump housing. In the gap between the rotor and the containment shell, however, easily dirt particles can accumulate, which are carried in the sucked by the pump water.
  • an automotive fluid pump apparatus having an impeller disposed in a housing of the fluid pump apparatus, wherein a seal means is provided between the impeller and the housing, and wherein means is provided for closing a seal gap of the seal means by magnetic force when the impeller is at a standstill.
  • the fluid pump device has the advantage that the impeller can seal a region of the housing via the sealing device, so that no dirt particles can penetrate into this region, when the impeller is at a standstill, since at a standstill, the sealing gap of the sealing device is closed.
  • an area of the housing which can be sealed via the sealing device is, for example, the pot which separates the motor housing part and the pump housing part of the housing from one another and wherein, for example, the rotor is arranged in the pot and can also be designed as the running wheel ,
  • the sealing device has at least one, two or more sealing elements, wherein the sealing elements can be formed in the form of protrusions, for example.
  • the sealing elements or projections are provided on the impeller and / or on the opposite housing section. In this case, at least one, several or all sealing elements or projections have a sealing surface which sealingly abut against the opposite housing or corresponding opposite impeller when the sealing gap is closed.
  • the sealing elements or projections may be arranged alternately on the impeller and the housing, so that when the impeller is actuated and the sealing gap is opened, the sealing elements or projections additionally form a labyrinth seal.
  • a sectional view through an example of a fluid pump device 10 is shown, more specifically a water pump device that can be provided with a sealing device 40 according to the invention.
  • the water pump device 10 has a rotor 14, which is designed as an impeller.
  • the rotor 14 is formed in the present embodiment, for example, as a plastic ferrite rotor.
  • the rotor 14 on the one hand forms the magnetic part of an electric motor.
  • the rotor 14 on the hydraulic side is simultaneously formed as an impeller or impeller.
  • the rotor can also be designed, for example, as a magnetic part of a magnetic coupling device (not shown).
  • the invention is not limited to such rotors and wheels.
  • a rotor or impeller which is or is designed as a hard ferrite ring with molded plastic body, etc ..
  • the rotor 14 is mounted on an impeller bushing 16 supported on a shaft 18.
  • the shaft 18 is received with one end 20 in a receptacle 22 of a pump housing 24 and the other end 26 in a receptacle 28 of a pot 30 of a motor housing 34.
  • a stator 35 is provided for driving the rotor 14 and Impeller.
  • the stator device 35 is arranged in a motor housing part 34, which is separated from the pot 30, so that no water can penetrate into this area.
  • This motor housing part 32, and the pot 30 are in this case with the pump housing 24, for example by means Screwed 36 screws.
  • the motor housing part 32 in the in Fig. 1 Example shown in addition to a plug device 38.
  • the motor housing pot 30 and the pump housing 24 are sealed against each other via a sealing device 40 according to the invention.
  • a device to be supplied with water is, for example, a heating device and / or a cooling device, for example as part of an air conditioning system of a vehicle, etc.
  • the water pump device 10 in this case has a sealing device 12, said sealing device 12 can be replaced by a sealing device 40 according to the invention, which in the following with reference to embodiments in the Figures 2-5 will be described in more detail.
  • the sealing device 40 according to the invention is provided between the rotor 14 and impeller and the motor housing pot 30, wherein the sealing device 40 according to the invention can be carried out, for example optionally additionally as a labyrinth seal device.
  • the sealing device 40 according to the invention serves to protect the in the present case, for example, magnetic rotor or impeller 14 of the water pump device 10 against contamination, such as molding sand, from the hydraulic part of the circuit.
  • magnétique dirt particles such as chips or molding sand with magnetic components that arise, for example, in the production of engine blocks in the casting process.
  • the dirt particles can settle in the relatively narrow gap 46 on the outside of the rotor 14 or impeller and ultimately lead to blocking of the rotor 14 or impeller.
  • the sealing device 40 is in the following Fig. 2 . 3 . 4 and 5 in a respective enlarged detail of the fluid pump device 10, here for example water pump device shown and will be explained in more detail with reference to these figures.
  • FIG. 2 Fig. 3 is a sectional view through part of a water pumping device 10 with the sealing device 40 according to one embodiment of the invention.
  • the rotor 14 and the impeller of the water pump device 10 is initially at a standstill.
  • water pump device 10 may, for example, as the water pump device 10 in Fig. 1 be formed, or have any other structure, for example, a separate rotor and a separate impeller, an electric motor and / or a magnetic coupling, etc.
  • the water pump device 10 a pump housing 24, in which a rotor 14 is provided.
  • the rotor 14 is in the present embodiment, for example, additionally designed as an impeller and arranged in a pot 30 of a motor housing 32.
  • the pot 30 is connected on its underside to the pump housing 24 and separates a motor housing part 32 with the stator of the pump housing part 24.
  • the stator is arranged, as exemplified in Fig.
  • the rotor 14 or the impeller is arranged on an impeller bush 16, for example a coal bush.
  • the impeller bushing 16 may in this case be injected, for example, in the rotor 14 or be attached to the rotor 14 in some other way.
  • a continuous shaft 18 is provided, which is guided on the impeller bush 16.
  • the shaft 18 is accommodated with its one end 26 in the pot 30.
  • the shaft 18 is injected, for example with one end 26 in the pot 30 and forms a bearing pin 48.
  • the other end 20 of the shaft 18 is in turn received in a corresponding receptacle 22 in the pump housing 24.
  • the impeller 14, which simultaneously forms the rotor 14 in the present embodiment, is axially movable.
  • the axial mobility of the impeller 14 and rotor 14 on the bearing pin 48 is determined for example by the tolerance position between contact surfaces of the impeller sleeve 16 and the contact surface of the pot 30 in the injection of the shaft or the contact surface of the receptacle 22 in the pump housing 24, so that the impeller 14 and the rotor 14 can move sufficiently in the axial direction in the direction of the pump housing and motor housing.
  • a clearance fit or a transition fit between the impeller sleeve 16 and the shaft 18 is provided, since in the example in Fig. 2 , the impeller bushing 16 is fixedly connected to the impeller or rotor 14 and therefore moves the impeller bushing with the rotor on the shaft axially.
  • the bushing 16 is preferably made of a material with corresponding sliding properties, wherein the impeller bushing 16 is formed for example as a carbon bushing.
  • the invention is not limited to this particular embodiment.
  • the radial bearing clearance is greater than zero and moves in a range of for example a few hundredths of a millimeter, so that on the one hand the impeller 14 with the bearing bush 16 can rotate on the bearing pin 48 and on the other hand essentially no or hardly any dirt particles from the water through the gap 50 between the impeller sleeve 16 and the bearing pin 48 can flow.
  • a start-up element 52 can be additionally provided on the shaft 18 between the impeller bush 16 and the receptacle 22 for the shaft 18 in the pump housing 24.
  • the starting element 52 is, for example, a thrust washer which is pushed onto the shaft 18 and has, for example, one or more brackets 54 for fixing to the pump housing 24. Instead of brackets 54 or in addition to these any other fastening device can be provided which is suitable Fixing element 52 to fix.
  • the run-up element 52 prevents the impeller bush 16 from coming into direct contact with the receptacle 22 for the shaft 18, which could otherwise lead to wear.
  • the starting element 16, as here the thrust washer for example, consists of metal, eg steel or stainless steel.
  • the pump housing 24 with its bearing or receptacle 22 for the shaft 18 optionally additionally have an upstream flow cap 56.
  • This upstream flow cap 56 serves to protect the bearing against contamination in the inflowing medium.
  • the flow cap 56 as an axial stop for the rotor 14 and the Impeller be formed when the rotor 14 and impeller moves in operation in the direction of the pump housing 24.
  • the starting element 52 can be provided on the flow cap 56 of the pump housing 24, to improve the sliding properties and to prevent wear by rubbing of the rotor 14 or impeller directly to the pump housing 24 and its flow cap 56th
  • the flow cap 56 may be provided in one piece or as a separate part on the pump housing 24.
  • an inlet section for example in the form of an intake 42
  • water is sucked during operation of the water pump device and the rotor 14 and the impeller to an outlet section, for example, the pump housing 24, in the present example in Fig. 2 a discharge nozzle 44, further pumped.
  • At least one further device which is supplied with the water of the water pump device, for example a cooling device, such as a heat exchanger cooling device, and / or a heating device, etc., can be connected to the outlet section or pressure connection 44.
  • a cooling device such as a heat exchanger cooling device, and / or a heating device, etc.
  • any other device can be connected to the water pump device or fluid pump device, which is to be supplied with water or another fluid.
  • the water which is sucked in via the Wasserpumenvorraum 10 and forwarded to one or more other devices to be supplied with water in the vehicle, for example, taken from the cooling water circuit of a connected internal combustion engine or taken from another device in which water can be provided for the water pump device.
  • Such internal combustion engines or their engine blocks are normally produced as a cast part.
  • molding sand is present, which can be sucked with the water through the water pump device 10 with.
  • a sealing device 40 is provided between the impeller 14, or in this case the rotor 14, which is additionally designed as an impeller, and the motor housing 30 or the motor housing pot 32.
  • This sealing device 40 is designed such that it seals or closes the connection between the rotor 14 or impeller and the pot 30 at standstill of the rotor 14 or impeller, so that no dirt or molding sand can get into this region of the gap 46 ,
  • a gap 46 between the rotor 14 and impeller and the pot 30 is formed, which is susceptible to contamination.
  • the sealing means 40 according to the invention between the rotor 14 and the impeller and the motor housing pot 30 is provided.
  • the sealing device 40 In the case of the sealing device 40 according to the invention, the fact is made use of that effect on the impeller or in this case the rotor of the water pump device 10 additionally formed as impeller 14, axial forces in the opposite direction during standstill and during operation. At standstill, the rotor 14 or the impeller is pulled by magnetic or permanent magnetic forces in the direction of the stator (not shown), which is externally provided on the motor housing pot 32 to drive the rotor 14 and the impeller. Specifically, parts of the stator means are magnetized even when the stator means is turned off or the rotor 14 is not operated.
  • the rotor or the impeller is therefore tightened at a standstill of the magnetized part or the magnetized parts of the stator, so that a corresponding magnetic force or axial force 68, the rotor 14 and the impeller at a standstill in the direction of the motor housing 30 pulls.
  • Such magnetized parts of the stator device are, for example, stator laminations made of electrical steel or a sheet metal ring (not shown) of the stator device. But it can also be any other metal part, which is magnetizable for example by the stator or for example also designed permanent magnetic and generates a magnetic force or axial force 68 on the rotor 14 and the impeller in the direction of the motor side.
  • the sealing device 40 is formed between the rotor 14 and impeller and the motor housing 32, wherein the sealing means 40 has at least one projection 60 on the motor housing 32 and motor housing pot 30 and / or the opposite pump housing 24.
  • This projection 60 forms a sealing surface 62nd or contact surface which comes into sealing contact with the pot 30 or the pump housing 24 on the opposite side when the rotor 14 or the impeller of the water pump device 10 is at a standstill.
  • the sealing device 40 is formed with a plurality of projections 60 as a labyrinth seal, wherein on the pump housing 24 and the motor housing 32 and motor housing pot 30 at least one, two or more projections 60 can be provided, which are arranged alternately to each other. More specifically, the pump housing 24 in Fig. 2 a projection 60 and the pot 30 has three projections 60, wherein the projection 60 of the pump housing 24, for example between the two inner projections 60 of the motor housing pot 30 is arranged.
  • the projection 60 of the rotor 14 or impeller forms a sealing surface 62 or contact surface which comes into sealing contact with the opposite pot 30 when the rotor 14 or the impeller of the water pump device 10 is at a standstill.
  • one or more projections 60 of the pot 30 can also form a sealing surface 62 or contact surface, which also come into sealing contact with the pump housing 24 when the rotor 14 and the water pump device 10 is at a standstill, but this is not absolutely necessary.
  • the outer projection 60 of the pot 30 optionally has, for example, an additional, second lateral sealing surface 64, which bears in a sealed manner on the opposite inner side of the pump housing 24 when the rotor 14 or the water pump device 10 is in operation.
  • this projection 60 can also be designed only so that it can be used for positioning pot 30 and thus also the motor housing 32 in the axial direction.
  • at least one or more sealing devices vorg Eye be, for example, in the form of sealing rings, which seal the pump housing 24 and the pot 30 to the outside against each other.
  • the above-described projections 60 on the pump housing 24 and the pot 30 can in each case be designed to be completely circumferential or partially circumferential, depending on the function and intended use.
  • the pump housing 24 and the pot 30 with at least one projection 60 for example, the projection 60 of the pump housing 24 sealingly abut each other or are in sealing contact, no dirt particles from the water get into the gap 46 between the rotor 14 and impeller and the pot 30 and attach there, for example.
  • the gap 66 may preferably have a size in a range between 0.1 mm to 0.5 mm when the impeller 14 or the water pump device 10 is in operation, as with reference to the following Fig. 4 and 5 is explained in more detail.
  • the gap 66 can also be selected smaller than 0.1 mm or larger than 0.5 mm, depending on the function and intended use. Even if a greater degree is selected for the gap 66 between the projection 60 of the pump housing 24 and the motor housing pot 30, in an example electrically operated auxiliary water pump as a water pump device 10 and an overflow of the additional water pump, for example, by a main water pump, the transport of dirt particles in the Gap 46 between the rotor 14 and the pot 30 can be effectively prevented at a standstill.
  • Fig. 3 is an enlarged section of the area of the pump housing 24 and the pot 30 with the sealing device 40 according to Fig. 2 shown.
  • the projection 60 of the impeller 14 and the rotor which is additionally formed as an impeller, at its end the sealing surface 62 or contact surface, as in Fig. 2 is shown at a standstill of the water pump device 10 to be pressed sealingly against the pot 30 and to close the sealing gap 66.
  • the projection 60 may be provided on the pot 30 at its end with a sealing surface 62 or contact surface, which is also pressed sealingly against the Pumengephinuse 24 when the rotor 14 and the impeller at a standstill moves to the motor side becomes.
  • the two projections 60 again form during operation of the rotor 14 or impeller of the water pump device 10, as in the following Fig. 4 and 5 is shown, a labyrinth seal in which the sealing gap 66 is opened again.
  • Fig. 4 is now a sectional view through a part of the water pump device 10 according to Fig. 2 shown with the sealing device 40, wherein the water pump device 10 is in this case in operation.
  • the rotor 14 which in the present example is additionally designed as an impeller, experiences reaction forces and hydraulic forces in the opposite direction, ie pump side. More specifically, in operation, ie, when the impeller or the rotor 14 is rotated by the stator, by the suction of water through the intake manifold 42, there in the region of the intake manifold, a lower pressure or a negative pressure generated relative to the suction nozzle 44th where the water is pumped on after aspiration.
  • the hydraulic force or axial force 68 in Fig. 4 engages the rotor 14 or impeller and pulls the rotor or the impeller towards the pump side.
  • the projection 60 of the pump housing 24 with its sealing surface 62 is brought out of sealing contact with the motor housing 32 and the sealing gap 66 is opened, preferably in a range between 0.1 mm to 0.5 mm.
  • the two projections 60 on the pump housing 24 and the motor housing 32 cooperate with the open sealing gap 66 as a labyrinth seal.
  • the sealing effect is based on the extension of the sealing path by the alternating arrangement of the projections 60 on the impeller 14 and the fixed motor housing 32.
  • the movement of the rotor 14 and the impeller sleeve 16 in the axial direction in the direction of the pump housing 24 is thereby by the Flow cap 56 of the pump housing 24 or here the start-up element 52 limited.
  • the sealing surface 62 of the respective projection 60 of the sealing device 40 (rotor side) abuts axially against the bottom of the pot 30 and closes the hydraulic part with respect to the magnetic part of the rotor 14 or closes the sealing gap 66 ,
  • Fig. 5 is an enlarged section of the pump housing 24 and the motor housing 32 according to Fig. 4 shown.
  • the additionally formed as an impeller rotor 14 is pulled by the generated during operation of the water pump device 10 axial force 68 toward the pump side and thereby opens the Sealing gap 66 between the projection 60 with its sealing surface 62 and the motor housing 30, for example, to a dimension preferably between 0.1 mm to 0.5 mm.
  • the projection 60 on the pump housing 24 forms with the projection or projections 60 of the pot 30 a labyrinth seal during operation of the water pump device 10.
  • the sealing gap 66 is in turn closed when the rotor 14 or the impeller are at a standstill.
  • the invention is not limited to this particular embodiment of a fluid pump device 10 or here water pump device, as shown in the Fig. 1 to 5 but can be applied to any type of fluid pump device in motor vehicles, in which a rotor or impeller for sucking and further pumping of water or other fluid is used.
  • a rotor or impeller for sucking and further pumping of water or other fluid is used.
  • an impeller can be provided independently of the rotor, wherein the rotor is not additionally formed in this case as an impeller (not shown).
  • the sealing device according to the invention, as described above, between the impeller and the housing or eg motor housing of the fluid pump device is provided.
  • the sealing device can also be provided in a fluid pump device, in which the rotor instead of a magnetic part of an electric motor or EC motor, for example, as a magnetic part of a magnetic coupling device is formed (not shown).
  • a magnetic force or axial force for example, also be generated via a stator of the magnetic coupling.
  • the sealing device is provided according to the invention between the impeller and the corresponding housing of the fluid pump device.
  • the fluid pump apparatus may be used to pump a fluid, such as water, for example, when the fluid flow is insufficient to supply cooling and / or heating to a connected facility such as a diesel cooling device, a preheater, or the like Turbocharger cooling device and / or an electronic component cooling device, etc.
  • a fluid such as water
  • a connected facility such as a diesel cooling device, a preheater, or the like Turbocharger cooling device and / or an electronic component cooling device, etc.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP10168287A 2009-07-31 2010-07-02 Dispositif de pompe à fluide doté d'un dispositif d'étanchéité Withdrawn EP2295809A2 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102009028144A DE102009028144A1 (de) 2009-07-31 2009-07-31 Fluidpumpenvorrichtung mit Dichtungseinrichtung

Publications (1)

Publication Number Publication Date
EP2295809A2 true EP2295809A2 (fr) 2011-03-16

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ID=43027533

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Application Number Title Priority Date Filing Date
EP10168287A Withdrawn EP2295809A2 (fr) 2009-07-31 2010-07-02 Dispositif de pompe à fluide doté d'un dispositif d'étanchéité

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EP (1) EP2295809A2 (fr)
DE (1) DE102009028144A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104379938A (zh) * 2012-06-28 2015-02-25 罗伯特·博世有限公司 用于机动车的冷却回路的泵

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011083868A1 (de) 2011-09-30 2013-04-04 Robert Bosch Gmbh Kühlkreislaufpumpe für ein Kraftfahrzeug
DE102014000765A1 (de) * 2014-01-24 2015-07-30 Brose Fahrzeugteile GmbH & Co. Kommanditgesellschaft, Würzburg Elektromotorische Wasserpumpe
EP3440362A4 (fr) * 2016-04-07 2020-01-08 Padmini VNA Mechatronics Pvt. Ltd. Pompe à eau dotée d'un séparateur et d'un joint pour protéger le rotor
DE102016209311A1 (de) * 2016-05-30 2017-11-30 Bühler Motor GmbH Elektrische kreiselpumpe
DE102016209312A1 (de) 2016-05-30 2017-11-30 Bühler Motor GmbH Elektrische kreiselpumpe

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19545561A1 (de) 1995-12-07 1997-06-12 Pierburg Ag Pumpe-Motoreinheit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19545561A1 (de) 1995-12-07 1997-06-12 Pierburg Ag Pumpe-Motoreinheit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104379938A (zh) * 2012-06-28 2015-02-25 罗伯特·博世有限公司 用于机动车的冷却回路的泵

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Publication number Publication date
DE102009028144A1 (de) 2011-02-03

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