EP2396550B1 - Motorpumpeneinheit - Google Patents

Motorpumpeneinheit Download PDF

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Publication number
EP2396550B1
EP2396550B1 EP09776377.5A EP09776377A EP2396550B1 EP 2396550 B1 EP2396550 B1 EP 2396550B1 EP 09776377 A EP09776377 A EP 09776377A EP 2396550 B1 EP2396550 B1 EP 2396550B1
Authority
EP
European Patent Office
Prior art keywords
motor
annular space
housing
motor housing
pump unit
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.)
Active
Application number
EP09776377.5A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2396550A1 (de
Inventor
Walter Schiffhauer
Dieter Plachke
Lanfranco Pol
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.)
Alfred Kaercher SE and Co KG
Original Assignee
Alfred Kaercher SE 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 Alfred Kaercher SE and Co KG filed Critical Alfred Kaercher SE and Co KG
Priority to PL09776377T priority Critical patent/PL2396550T3/pl
Publication of EP2396550A1 publication Critical patent/EP2396550A1/de
Application granted granted Critical
Publication of EP2396550B1 publication Critical patent/EP2396550B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/08—Cooling; Heating; Preventing freezing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors

Definitions

  • the invention relates to a motor pump unit for a high-pressure cleaning device having a liquid-cooled electric motor and a pump, wherein the electric motor has a motor housing which is surrounded by a cylinder jacket-shaped cooling housing to form an annulus provided with an annular space inlet and an annular space, and wherein the pump with the annular space connected suction inlet for sucking liquid and a pressure outlet for dispensing liquid and wherein the pumped by the pump liquid to be fed to the annular space inlet and the cooling housing inside at least one flow guide rib for guiding the liquid in the annular space.
  • Such motor pump units are from the DE 10 2007 009 394 A1 known. They are used in high-pressure cleaning devices in which a liquid, preferably water, can be pressurized and then discharged via the pressure outlet. At the pressure outlet, a high-pressure hose can be connected, which carries at its free end, for example, a spray lance. This provides the ability to direct a high pressure jet of liquid at an object, for example, to clean the object.
  • the drive of the pump by means of an electric motor, which is cooled by the liquid which is supplied to the pump.
  • the motor housing is surrounded by a cylinder jacket-shaped cooling housing, wherein an annular space is formed between the motor housing and the cooling housing, which can be supplied via an annulus inlet of the pump to be pumped liquid.
  • the liquid can flow through the annular space and pass through the annular space outlet to the suction inlet of the pump so that it can then be pressurized.
  • Flow guide in the form of Strömungsleitrippen which are arranged on the inside of the cooling housing, pass the liquid through the annulus.
  • the Strömungsleitrippen are in the motor pump unit, which in the DE 10 2007 009 394 A1 is described, designed as support ribs, with the help of which the cooling housing is supported on the motor housing.
  • the pump will be connected to the public water supply network. This has the consequence that within the annular space prevailing in the water supply network discharge pressure of a few bar, for example, 5 to 10 bar, prevails.
  • discharge pressure of a few bar, for example, 5 to 10 bar.
  • Object of the present invention is to develop a motor pump unit of the type mentioned in such a way that it is ensured that even in the long term no liquid can escape from the annulus.
  • the motor housing is subject to unavoidable vibration. These can lead to a relative movement between the flow guide ribs of the cooling housing and the motor housing. If the flow guide ribs lie directly against the motor housing, the flow guide ribs can damage the surface of the motor housing by rubbing or scratching. As a result, the surface structure of the motor housing can be affected, and this in turn can cause liquid from the annulus through the damaged motor housing can enter into the interior of the electric motor.
  • the invention provides that the Strömungsleitrippen occupy a distance from the motor housing, that is, between the Strömungsleitrippen and the motor housing, a gap extends.
  • a flow guide rib is arranged between the annular space inlet and the annular space outlet. This ensures that over The liquid entering the annular space can not directly reach the annular space outlet, but much of the liquid, starting from the annular space inlet, flows around the entire motor housing, only then to reach the annular space outlet.
  • the cooling housing has a plurality of circumferentially offset from one another arranged Strömungsleitrippen, each comprising a passage, wherein the passages of adjacent Strömungsleitrippen are axially offset from one another.
  • the Strömungsleitrippen define a total of a labyrinth-like, in the circumferential direction around the motor housing leading around the flow path from the annular space inlet to the annulus outlet. This results in a particularly effective cooling of the electric motor result.
  • the height of the gap between the at least one flow guide rib and the motor housing is preferably at least 0.3 mm. In particular, a height of 0.5 mm and more has proved to be advantageous. It can be provided, for example, that the height of the gap between the at least one flow guide rib and the motor housing is at least 1 mm.
  • the height of the Strömungsleitrippen is preferably at least 1 mm. It can be provided, for example, that the flow guide ribs have a height of at least 2 mm. In an advantageous embodiment, a height of at least 3 mm is provided.
  • the height of the flow guide ribs is a multiple of the height of the gap.
  • the motor housing carries a corrosion protection layer.
  • the motor housing may, for example, be coated with a special protective material. But it can also be provided that the corrosion protection layer is designed as an oxidation layer of the motor housing.
  • the motor housing may preferably be made of a deep-drawn steel, which is oxidized on the surface.
  • the cooling housing is preferably made of plastic.
  • Plastic housings are usually prone to vibration. It is therefore particularly advantageous for plastic housings when the at least one flow guide rib is at a distance from the motor housing in order to avoid surface damage.
  • the annular space is sealed in a particularly preferred embodiment by means of a front and a rear sealing ring, which in the radial direction between the motor housing and the cooling housing are trapped.
  • the sealing of the annular space in the region of the sealing rings is thus effected by a radial load of the sealing rings.
  • the motor housing facing the pump has an outwardly projecting annular flange, which is adjoined by an annular sealing surface against which the front sealing ring rests.
  • the outwardly projecting annular flange of the motor housing can be clamped between a bearing plate, which is formed by a drive housing of the pump, and an end face of the cooling housing.
  • On the rear side facing away from the pump of the outwardly projecting annular flange of the front sealing ring may be positioned, which is clamped in the radial direction between an adjoining the annular flange annular sealing surface of the motor housing and a corresponding annular sealing surface of the cooling housing.
  • the motor housing facing away from the pump has a cylinder-jacket-shaped collar which is surrounded by a cylinder jacket-shaped projection of the cooling housing with the interposition of the rear sealing ring.
  • the cylinder jacket-shaped collar of the pot-shaped motor housing can extend between the bottom and the jacket of the motor housing.
  • a cylinder jacket-shaped projection of the cooling housing can be aligned concentrically with the cylinder jacket-shaped collar of the motor housing be, and between the collar and the neck of the rear sealing ring can be braced in the radial direction.
  • a motor pump unit 10 is shown schematically with a liquid-cooled electric motor 11 and a pump 12.
  • the electric motor 11 has in the usual way a rotor 14 which is surrounded by a stator 15.
  • a pot-shaped motor housing 17 connects to the outside, which is made of a deep-drawn steel. It has a cylinder jacket-shaped peripheral wall 18 and a bottom 19.
  • the bottom 19 forms an axially outwardly directed receptacle 20 for a first bearing 21 of a motor shaft 22.
  • a second bearing 23 for the motor shaft 22 is disposed on a bearing plate 26, of a Drive housing 28 of the pump 12 is formed.
  • the motor housing 17 is surrounded in the circumferential direction by a cylinder jacket-shaped cooling housing 30, wherein between the motor housing 17 and the cooling housing 30, an annular space 32 is arranged, which completely surrounds the motor housing 17 in the circumferential direction.
  • an annular space inlet 33 of the cooling housing 30 liquid can be supplied to the annular space 32, which then flows through the annular space 32.
  • an annular space outlet 34 of the cooling housing 30 the liquid can flow out of the annular space 32.
  • the cooling housing 30 carries on the inside a plurality of circumferentially uniformly spaced Strömungsleitrippen 36 which protrude radially into the annular space 32, but they do not touch the motor housing 17, but extends between each Strömungsleitrippe 36 and the motor housing 17, a gap 37 with a height of about 1 mm.
  • the height of the Strömungsleitrippen 36 in the radial direction is at least 2 mm. It is advantageous if the height of the Strömungsleitrippen 36 is at least twice as large as the height of the gap 37. It is particularly advantageous if the height of the Strömungsleitrippen 36 in the radial direction a multiple of the height of the gap 37 carries.
  • the Strömungsleitrippen 36 have a height of at least 3 mm and the height of the gap 37 may be at most 1 mm.
  • the Strömungsleitrippen 36 each have a passage 38 through which liquid, which is supplied to the annular space 32, can flow therethrough.
  • the passages 38 of adjacent Strömungsleitrippen 36 are axially offset from one another, so that the Strömungsleitrippen 36 a labyrinthine, in the circumferential direction around the motor housing 17 around leading flow path from the annulus inlet 33 to the annulus outlet 34 define.
  • the annular space 32 is sealed by a front sealing ring 41 and a rear sealing ring 42.
  • the front sealing ring 41 is arranged on the side facing away from the pump 12 of an outwardly projecting annular flange 44 of the motor housing 17, which is clamped between the bearing plate 26 and the pump 12 facing the end face of the cooling housing 30.
  • the sealing of the annular space 32 in the region of the front sealing ring 41 is effected by radial loading of the sealing ring 41. This is braced between an annular sealing surface 45 of the motor housing 17 and a corresponding annular sealing surface 46 of the cooling housing 30 in the radial direction.
  • the rear sealing ring 42 abuts against a cylinder jacket-shaped collar 48 of the motor housing 17, which extends in the transition region between the bottom 19 and the peripheral wall 18 concentric with the motor shaft 22.
  • the collar 48 is surrounded by a cylinder jacket-shaped projection 49 of the cooling housing 30, which is aligned concentrically with the collar 48.
  • Between the collar 48 and the projection 49 of the rear sealing ring 42 is braced in the radial direction. In the axial direction, it is supported by a radially inwardly directed return of the cooling housing 30.
  • the motor housing 17 is, it has already been noted, made of a deep-drawing steel. This has superficially on an oxidation layer, the acts as a corrosion protection layer and ensures that the motor housing 17 is permanently impermeable to water. Since the Strömungsleitrippen 36 occupy a distance from the motor housing 17, it is ensured that the superficial oxidation layer of the motor housing 17 is not affected by vibrations of the motor housing 17, which could result in damage to the surface of the motor housing 17, if the Strömungsleitrippen 36, the surface of the Motor housing 17 could touch.
  • the pump 12 has a suction inlet 51 and a pressure outlet 52 in the usual way.
  • Parallel to the motor shaft 22 aligned piston 54 of the pump 12 are applied to a swash plate 56 which is adjacent to the drive housing 28, the bearing plate 26, and coupled to the motor shaft 22.
  • the piston 54 are shown in the drawing at a distance from the swash plate 56. In fact, they bear against the swash plate 56 on the face side and are thereby driven to a reciprocating motion. With their end facing away from the swash plate 56, the pistons 54 dive into a pumping space in the usual way, so that liquid can be sucked into the pumping space from the suction inlet 51 and released under pressure via the pressure outlet 52.
  • the conduit arrangement 60 comprises a supply line 61, which is connected to a first cooling channel 62 of the drive housing 28, which in turn is connected in a liquid-tight manner to the annular space inlet 33.
  • the conduit arrangement 60 also has a connection line 63, which is aligned parallel to the supply line 61 and a parallel to the first cooling channel 62 aligned second cooling channel 64 of the drive housing 28 connects to the suction inlet 51.
  • the second cooling channel 64 is liquid-tightly connected to the annular space outlet 34.
  • From the pump to be conveyed liquid can thus first from the supply line 61, the first cooling passage 62 and then flow through the annulus 32, and then pass through the connecting line 63 to the suction inlet 51 so that they are pressurized by the pump 12 and on the Pressure outlet 52 can be discharged.
  • the two cooling channels 62 and 64 are integrally connected via heat conducting ribs 66 to a base body 68 of the drive housing 28.
  • the main body 68 surrounds the swash plate 56 and also forms the bearing plate 26.
  • the drive housing 28 is made of metal, preferably of an aluminum alloy.
  • the motor pump unit 10 is characterized by a long service life.
  • Strömungsleitrippen 36 ensure that the liquid flows through the annulus 32 largely labyrinth-like, so that a very good heat transfer from the motor housing 17 is ensured to the liquid. Only a small portion of the liquid flows directly through the gaps 37 between the Strömungsleitrippen 36 and the motor housing 17 therethrough. Waste heat of the electric motor 11 can thus be reliably dissipated, wherein also the long-term water impermeability of the motor housing 17 is ensured. Also in the axial direction, the liquid can not flow out of the annular space 32. This is ensured by the provision of the radially loaded sealing rings 41 and 42. Since, in addition, the drive housing 28 is cooled by the liquid to be conveyed, overall the heat load of the motor pump unit 10 can be kept permanently low.

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)
  • Motor Or Generator Cooling System (AREA)
EP09776377.5A 2009-02-13 2009-02-13 Motorpumpeneinheit Active EP2396550B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL09776377T PL2396550T3 (pl) 2009-02-13 2009-02-13 Zespół motopompy

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2009/001027 WO2010091699A1 (de) 2009-02-13 2009-02-13 Motorpumpeneinheit

Publications (2)

Publication Number Publication Date
EP2396550A1 EP2396550A1 (de) 2011-12-21
EP2396550B1 true EP2396550B1 (de) 2014-04-02

Family

ID=40801864

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09776377.5A Active EP2396550B1 (de) 2009-02-13 2009-02-13 Motorpumpeneinheit

Country Status (8)

Country Link
US (1) US8734129B2 (zh)
EP (1) EP2396550B1 (zh)
CN (1) CN102292550A (zh)
AU (1) AU2009339813B2 (zh)
DK (1) DK2396550T3 (zh)
ES (1) ES2461840T3 (zh)
PL (1) PL2396550T3 (zh)
WO (1) WO2010091699A1 (zh)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2661558B8 (de) * 2010-12-14 2018-12-26 Alfred Kärcher SE & Co. KG Motorpumpeneinheit für ein hochdruckreinigungsgerät sowie hochdruckreinigungsgerät
CN105317692A (zh) * 2014-05-30 2016-02-10 戴博邦浦股份有限公司 用于泵、特别是离心泵和外围离心泵的电机壳
US9946564B2 (en) 2015-06-23 2018-04-17 International Business Machines Corporation Adjusting virtual machine migration plans based on alert conditions related to future migrations

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WO2010091699A1 (de) 2010-08-19
DK2396550T3 (da) 2014-05-26
AU2009339813B2 (en) 2014-04-03
US20120034112A1 (en) 2012-02-09
US8734129B2 (en) 2014-05-27
PL2396550T3 (pl) 2014-09-30
CN102292550A (zh) 2011-12-21
AU2009339813A1 (en) 2011-09-01
ES2461840T3 (es) 2014-05-21
EP2396550A1 (de) 2011-12-21

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